% \iffalse
% This document requires lualatex
%%
%% Copyright (C) 2012-2021 Javier Bezos and Johannes L. Braams.
%% Copyright (C) 1989-2012 Johannes L. Braams and
%%           any individual authors listed elsewhere in this file.
%% All rights reserved.
%%
%%
%% This file is part of the Babel system.
%% --------------------------------------
%%
%% It may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2003/12/01 or later.
%%
%% This work has the LPPL maintenance status "maintained".
%%
%% The Current Maintainer of this work is Javier Bezos.
%%
%% The list of derived (unpacked) files belonging to the distribution
%% and covered by LPPL is defined by the unpacking scripts (with
%% extension |.ins|) which are part of the distribution.
%%
% \fi
%
% \CheckSum{5011}
%
% \iffalse
%<*filedriver>
\ProvidesFile{babel.dtx}[2021/06/28 v3.61 The Babel package]
\documentclass{ltxdoc}
\GetFileInfo{babel.dtx}
\usepackage{fontspec}
\setmainfont[
     Scale=.88,
     BoldFont = NotoSerif-Bold.ttf,
     ItalicFont = NotoSerif-Italic.ttf,
     BoldItalicFont = NotoSerif-BoldItalic.ttf]
  {NotoSerif-Regular.ttf}
\setsansfont[
     Scale=.88,
     BoldFont = NotoSans-Bold.ttf,
     ItalicFont = NotoSans-Italic.ttf,
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  {NotoSans-Regular.ttf}
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\raggedright
\addtolength{\textwidth}{25pt}
\addtolength{\textheight}{3.5cm}
\addtolength{\topmargin}{-2cm}
\font\manual=logo10 % font used for the METAFONT logo, etc.
\newcommand*\MF{{\manual META}\-{\manual FONT}}
\newcommand*\babel{\textsf{babel}}
\newcommand*\Babel{\textsf{Babel}}
\newcommand*\xetex{\textsf{xetex}}
\newcommand*\pdftex{\textsf{pdftex}}
\newcommand*\luatex{\textsf{luatex}}
\newcommand\largetex{T\kern -.1517em\lower .45ex\hbox {E}\kern -.09emX}
\newcommand*\nb[1]{}
\newcommand*\m[1]{\mbox{$\langle$\normalfont\itshape#1\/$\rangle$}}
\newcommand*\langlist{%
  \meta{language}\texttt{,}\meta{language}\texttt{,}...}
\newcommand*\langvar{\m{lang}}
\newcommand*\Lopt[1]{\textsf{#1}}
\newcommand*\Lenv[1]{\texttt{#1}}
\newcommand*\menv[1]{\char`\{#1\char`\}}
\newcommand*\Eenv[1]{%
  \quad\ldots\quad
  \texttt{\color{thered}\string\end\menv{#1}}}
\newcommand*\file[1]{\texttt{#1}}
\newcommand*\cls[1]{\texttt{#1}}
\newcommand*\pkg[1]{\texttt{#1}}
\addtolength{\oddsidemargin}{1em}
\setlength{\leftmargini}{1.5em}
\usepackage{framed}
\usepackage{multicol}
\usepackage{color,colortbl}
\usepackage[linkcolor=blue,urlcolor=blue,colorlinks=true]{hyperref}
\hypersetup{%
  pdfsubject={LaTeX Multilingual documents and localization for pdfTeX, LuaTex and
  XeTeX.},
  pdfauthor={Johannes Braams, Javier Bezos},
  pdftitle={Babel},
  pdfkeywords={TeX, LaTeX, pdfTeX, LuaTeX, XeTeX, internationalization,
  localization}}
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\newtheorem{note}{Note}
\newtheorem{example}{Example}
\newtheorem{troubleshooting}{Troubleshooting}
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\def\DescribeOther{\vskip-4ex\Describe}
\makeatletter
\def\trouble#1{\addcontentsline{tsh}{trouble}{#1}}
\def\listoftroubles{\section*{Troubleshoooting}\@starttoc{tsh}}
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\makeatother
\begin{document}
\title{Babel, a multilingual package for use with \LaTeX's standard
   document classes\thanks{During the development ideas from Nico
   Poppelier, Piet van Oostrum and many others have been used.
   Bernd Raichle has provided many helpful suggestions.}}
\author{Johannes Braams\\
        Kersengaarde 33\\
        2723 BP Zoetermeer\\
        The Netherlands\\
        \normalsize From version 3.9 on, Javier Bezos\\
        \normalsize \texttt{www.texnia.com}}

\date{Typeset \today}
\begin{titlepage}
\begin{minipage}[t][0pt]{30cm}
\vspace{-3cm}\hspace{-7cm}
\sffamily
\begin{tabular}{p{8cm}p{15cm}}
\cellcolor[rgb]{.86,.73,.67}
&\cellcolor[rgb]{.95,.95,.95}
\vspace{3.6cm}%
\color[rgb]{.55,.4,.35}
\leftskip5mm
\sffamily\fontsize{72}{72}\selectfont Babel
\vspace{1.8cm}
\\
\cellcolor[rgb]{.95,.95,.95}
\vspace{2cm}\hspace{1.5cm}
\begin{minipage}{5cm}
\Large
Version \csname @gobble\expandafter\endcsname\fileversion\newline
\filedate

\LARGE
\vspace{1.2cm}
Johannes L. Braams\\[-.5ex]
{\large Original author}

\vspace{.3cm}
Javier Bezos\\[-.5ex]
{\large Current maintainer}
\end{minipage}
&\cellcolor[rgb]{.92, .86, .73}
\vspace{2cm}
\leftskip5mm
\begin{minipage}{10cm}
\fontsize{35}{45}\selectfont
\setlength\parskip{3mm}\raggedright
Localization and internationalization\\[1cm]
Unicode\\
\largetex\\
pdf\largetex\\
Lua\largetex\\
Xe\largetex
 \vspace{20cm}
\end{minipage}
\end{tabular}
\end{minipage}
\end{titlepage}

\tableofcontents
\listoftroubles
\clearpage

\part{User guide}

\begin{description}
\item[\sffamily\color{messages}What is this document about?] This user
guide focuses on internationalization and localization with \LaTeX{}
and \pdftex, \xetex{} and \luatex{} with the \babel{} package. There
are also some notes on its use with e-Plain and pdf-Plain \TeX . Part II
describes the code, and usually it can be ignored.

\item[\sffamily\color{messages}What if I’m interested only in the
latest changes?] Changes and new features with relation to version 3.8
are highlighted with \New{X.XX}\hspace{-.5em}, and there are some notes
for the latest versions in
\href{https://latex3.github.io/babel/}{the
\babel{} site}. The most recent features can be still unstable.

\item[\sffamily\color{messages}Can I help?] Sure! If you are interested
in the \TeX{} multilingual support, please join the
\href{http://tug.org/mailman/listinfo/kadingira}{kadingira mail list}.
You can follow the development of \babel{} in
\href{https://github.com/latex3/babel}{GitHub} and make suggestions; feel
free to fork it and make pull requests. If you are the author of a
package, send to me a few test files which I'll add to mine, so that
possible issues can be caught in the development phase.

\item[\sffamily\color{messages}It doesn't work for me!] You can ask for
help in some forums like \textsf{tex.stackexchange}, but if you have
found a bug, I strongly beg you to report it in
\href{https://github.com/latex3/babel/issues}{GitHub}, which is much
better than just complaining on an e-mail list or a web forum. Remember
\textit{warnings are not errors} by themselves, they just warn about
possible problems or incompatibilities.

\item[\sffamily\color{messages}How can I contribute a new
language?] See section \ref{contribute} for contributing a language.

\item[\sffamily\color{messages}I only need learn the most basic
features.] The first subsections (1.1-1.3) describe the traditional way
of loading a language (with |ldf| files), which is usually all you need.
The alternative way based on |ini| files, which complements the
previous one (it does \textit{not} replace it, although it is still
necessary in some languages), is described below; go to \ref{inifiles}.

\item[\sffamily\color{messages}I don’t like manuals. I prefer sample
  files.] This manual contains lots of examples and tips, but in GitHub
  there are many
  \href{https://github.com/latex3/babel/tree/master/samples}{sample
  files}.
\end{description}

\section{The user interface}\label{U-I}

\subsection{Monolingual documents}

In most cases, a single language is required, and then all you need in
\LaTeX{} is to load the package using its standard mechanism for this
purpose, namely, passing that language as an optional argument. In
addition, you may want to set the font and input encodings. 

Another approach is making the language a global option in order to let
other packages detect and use it. This is the standard way in \LaTeX{}
for an option – in this case a language – to be recognized by several
packages.

Many languages are compatible with \textsf{xetex} and \textsf{luatex}.
With them you can use \babel{} to localize the documents. When these
engines are used, the Latin script is covered by default in current
\LaTeX{} (provided the document encoding is UTF-8), because the font
loader is preloaded and the font is switched to |lmroman|. Other
scripts require loading \textsf{fontspec}. You may want to set the font
attributes with \textsf{fontspec}, too.

\begin{example}
  Here is a simple full example for “traditional” \TeX{} engines
  (see below for \xetex{} and \luatex{}). The packages |fontenc| and
  |inputenc| do not belong to \babel, but they are included in the
  example because typically you will need them. It assumes UTF-8, the
  default encoding:
\setengine{pdftex}
\begin{verbatim}
\documentclass{article}

\usepackage[T1]{fontenc}

_\usepackage[french]{babel}_

\begin{document}

Plus ça change, plus c'est la même chose!

\end{document}
\end{verbatim}

Now consider something like:
\begin{verbatim}
_\documentclass[french]{article}_
\usepackage{babel}
\usepackage{varioref}
\end{verbatim}
With this setting, the package \texttt{varioref} will also see
the option |french| and will be able to use it.
\end{example}

\begin{example}
And now a simple monolingual document in Russian (text from the
Wikipedia) with \xetex{} or \luatex{}. Note neither \textsf{fontenc}
nor \textsf{inputenc} are necessary, but the document should be encoded
in UTF-8 and a so-called Unicode font must be loaded (in this example
|\babelfont| is used, described below).

\setengine{luatex/xetex}
\begin{verbatim}
_\documentclass[russian]{article}_

\usepackage{babel}

_\babelfont{rm}{DejaVu Serif}_

\begin{document}

Россия, находящаяся на пересечении множества культур, а также
с учётом многонационального характера её населения, — отличается
высокой степенью этнокультурного многообразия и способностью к
межкультурному диалогу.

\end{document}
\end{verbatim}
\end{example}

\begin{troubleshooting}
\trouble{Paragraph ended before \textbackslash UTFviii@three@octets
was complete}
A common source of trouble is a wrong setting of the input encoding.
Depending on the \LaTeX{} version you can get the following somewhat
cryptic error:
\begin{verbatim}
! Paragraph ended before \UTFviii@three@octets was complete.
\end{verbatim}
Or the more explanatory:
\begin{verbatim}
! Package inputenc Error: Invalid UTF-8 byte ...
\end{verbatim}
Make sure you set the encoding actually used by your editor.
\end{troubleshooting}

\begin{note}
  Because of the way \babel{} has evolved, ``language'' can refer to
  (1) a set of hyphenation patterns as preloaded into the format, (2)
  a package option, (3) an |ldf| file, and (4) a name used in the
  document to select a language or dialect. So, a package option
  refers to a language in a generic way -- sometimes it is the actual
  language name used to select it, sometimes it is a file name loading
  a language with a different name, sometimes it is a file name
  loading several languages. Please, read the documentation for
  specific languages for further info.
\end{note}

\begin{troubleshooting}
  The following warning is about hyphenation patterns, which are
  not under the direct control of \babel:
\trouble{No hyphenation patterns were preloaded for (babel) the
  language `LANG' into the format}
\begin{verbatim}
Package babel Warning: No hyphenation patterns were preloaded for
(babel)                the language `LANG' into the format.
(babel)                Please, configure your TeX system to add them and
(babel)                rebuild the format. Now I will use the patterns
(babel)                preloaded for \language=0 instead on input line 57.
\end{verbatim}
  The document will be typeset, but very likely the text will not be
  correctly hyphenated. Some languages may be raising this warning
  wrongly (because they are not hyphenated); it is a bug to be fixed
  -- just ignore it. See the manual of your distribution (Mac\TeX,
  Mik\TeX, \TeX Live, etc.) for further info about how to configure
  it.
\end{troubleshooting}

\begin{note}
  With \textsf{hyperref} you may want to set the document language with
  something like:
\begin{verbatim}
\usepackage[_pdflang=es-MX_]{hyperref}
\end{verbatim}
This is not currently done by \babel{} and you must set it by hand.
\end{note}

\begin{note}
  Although it has been customary to recommend placing |\title|,
  |\author| and other elements printed by |\maketitle| after
  |\begin{document}|, mainly because of shorthands, it is advisable to
  keep them in the preamble. Currently there is no real need to use
  shorthands in those macros.
\end{note}

\subsection{Multilingual documents}

In multilingual documents, just use a list of the required languages as
package or class options. The last language is considered the main one,
activated by default. Sometimes, the main language changes the document
layout (eg, |spanish| and |french|).

\begin{example}
  In \LaTeX, the preamble of the document:
\begin{verbatim}
\documentclass{article}
\usepackage[dutch,english]{babel}
\end{verbatim}
  would tell \LaTeX\ that the document would be written in two
  languages, Dutch and English, and that English would be the first
  language in use, and the main one.
\end{example}

You can also set the main language explicitly, but it is discouraged
except if there a real reason to do so:
\begin{verbatim}
\documentclass{article}
\usepackage[_main=english_,dutch]{babel}
\end{verbatim}

Examples of cases where |main| is useful are the following.

\begin{note}
Some classes load \babel{} with a hardcoded language option. Sometimes,
the main language can be overridden with something like that before
|\documentclass|:
\begin{verbatim}
\PassOptionsToPackage{main=english}{babel}
\end{verbatim}
\end{note}

\begin{warning}
  Languages may be set as global and as package option at the same
  time, but in such a case you should set explicitly the main language
  with the package option |main|:
\begin{verbatim}
\documentclass[_italian_]{book}
\usepackage[ngerman,_main=italian_]{babel}
\end{verbatim}
\end{warning}

\begin{warning}
  In the preamble the main language has \textit{not} been selected,
  except hyphenation patterns and the name assigned to |\languagename|
  (in particular, shorthands, captions and date are not activated). If
  you need to define boxes and the like in the preamble, you might
  want to use some of the language selectors described below.
\end{warning}

To switch the language there are two basic macros, described below in
detail: |\selectlanguage| is used for blocks of text, while
|\foreignlanguage| is for chunks of text inside paragraphs.

\begin{example}
A full bilingual document with \pdftex{} follows. The main language is
|french|, which is activated when the document begins. It assumes UTF-8:
\setengine{pdftex}
\begin{verbatim}
\documentclass{article}

\usepackage[T1]{fontenc}

_\usepackage[english,french]{babel}_

\begin{document}

Plus ça change, plus c'est la même chose!

_\selectlanguage{english}_

And an English paragraph, with a short text in
_\foreignlanguage{french}{français}_.

\end{document}
\end{verbatim}
\end{example}

\begin{example}
  With \xetex{} and \luatex, the following bilingual, single script
  document in UTF-8 encoding just prints a couple of ‘captions’ and
  |\today| in Danish and Vietnamese. No additional packages are
  required.
\setengine{luatex/xetex}
\begin{verbatim}
\documentclass{article}

_\usepackage[vietnamese,danish]{babel}_

\begin{document}

\prefacename{} -- \alsoname{} -- \today

\selectlanguage{vietnamese}

\prefacename{} -- \alsoname{} -- \today

\end{document}
\end{verbatim}
\end{example}

\begin{note}
  Once loaded a language, you can select it with the corresponding
  BCP47 tag. See section \ref{bcp47} for further details.
\end{note}

\subsection{Mostly monolingual documents}

\New{3.39} Very often, multilingual documents consist of a main
language with small pieces of text in another languages (words, idioms,
short sentences). Typically, all you need is to set the line breaking
rules and, perhaps, the font. In such a case, \babel{} now does not
require declaring these secondary languages explicitly, because the
basic settings are loaded on the fly when the language is selected (and
also when provided in the optional argument of |\babelfont|, if used.)

This is particularly useful, too, when there are short texts of this
kind coming from an external source whose contents are not known on
beforehand (for example, titles in a bibliography). At this regard, it
is worth remembering that |\babelfont| does \textit{not} load any font
until required, so that it can be used just in case.

\begin{example}
  A trivial document with the default font in English and Spanish, and
  FreeSerif in Russian is:
\setengine{luatex/xetex}
\begin{verbatim}
\documentclass[english]{article}
\usepackage{babel}

_\babelfont[russian]{rm}{FreeSerif}_

\begin{document}

English. _\foreignlanguage{russian}{Русский}_.
_\foreignlanguage{spanish}{Español}_.

\end{document}
\end{verbatim}
\end{example}

\begin{note}
  Instead of its name, you may prefer to select the language with the
corresponding BCP47 tag. This alternative, however, must be activated
explicitly, because a two- or tree-letter word is a valid name for a
language (eg, |yi|). See section \ref{bcp47} for further details.
\end{note}

\subsection{Modifiers}

\New{3.9c} The basic behavior of some languages can be modified when
loading \babel{} by means of \textit{modifiers}. They are set after
the language name, and are prefixed with a dot (only when the language
is set as package option -- neither global options nor the |main| key
accepts them). An example is (spaces are not significant and they can
be added or removed):\footnote{No predefined ``axis'' for modifiers
are provided because languages and their scripts have quite different
needs.}
\begin{verbatim}
\usepackage[latin_.medieval_, spanish_.notilde.lcroman_, danish]{babel}
\end{verbatim}

Attributes (described below) are considered modifiers, ie, you can
set an attribute by including it in the list of modifiers. However,
modifiers are a more general mechanism.

\subsection{Troubleshooting}

\begin{itemize}
\item Loading directly |sty| files in \LaTeX{} (ie,
  |\usepackage|\marg{language}) is deprecated and you will get the
  error:\footnote{In old versions the error read ``You have used an
  old interface to call babel'', not very helpful.}
\trouble{You are loading directly a language style}
\begin{verbatim}
! Package babel Error: You are loading directly a language style.
(babel)                This syntax is deprecated and you must use
(babel)                \usepackage[language]{babel}.
\end{verbatim}

\item  Another typical error when using \babel{} is the
  following:\footnote{In old versions the error read ``You haven't
  loaded the language LANG yet''.}
\trouble{Unknown language `LANG'}
\begin{verbatim}
! Package babel Error: Unknown language `#1'. Either you have
(babel)                misspelled its name, it has not been installed,
(babel)                or you requested it in a previous run. Fix its name,
(babel)                install it or just rerun the file, respectively. In
(babel)                some cases, you may need to remove the aux file
\end{verbatim}
  The most frequent reason is, by far, the latest (for example, you
  included |spanish|, but you realized this language is not used after
  all, and therefore you removed it from the option list). In most
  cases, the error vanishes when the document is typeset again, but in
  more severe ones you will need to remove the |aux| file.
\end{itemize}

\subsection{Plain}

In e-Plain and pdf-Plain, load languages styles with |\input| and then use
|\begindocument| (the latter is defined by \babel):
\begin{verbatim}
\input estonian.sty
\begindocument
\end{verbatim}

\begin{warning}
  Not all languages provide a |sty| file and some of them are not
  compatible with those formats. Please, refer to
  \href{https://latex3.github.io/babel/guides/using-babel-with-plain.html}%
   {Using babel with Plain} for further details.
\end{warning}

\subsection{Basic language selectors}

This section describes the commands to be used in the document to
switch the language in multilingual documents. In most cases, only the
two basic macros |\selectlanguage| and |\foreignlanguage| are
necessary. The environments |otherlanguage|, |otherlanguage*| and
|hyphenrules| are auxiliary, and described in the next section.

The main language is selected automatically when the |document|
environment begins.

\Describe{\selectlanguage}{\marg{language}}
When a user wants to switch from one language to another he can
do so using the macro |\selectlanguage|. This macro takes the
language, defined previously by a language definition file, as
its argument. It calls several macros that should be defined in
the language definition files to activate the special definitions
for the language chosen:
\begin{verbatim}
\selectlanguage{german}
\end{verbatim}

This command can be used as environment, too.

\begin{note}
  For ``historical reasons'', a macro name is converted to a language
  name without the leading |\|; in other words,
  |\selectlanguage{\german}| is equivalent to
  |\selectlanguage{german}|. Using a macro instead of a ``real'' name
  is deprecated. \New{3.43} However, if the macro name does not match
  any language, it will get expanded as expected.
\end{note}

\begin{warning}
  If used inside braces there might be some non-local changes, as this
  would be roughly equivalent to:
\begin{verbatim}
{\selectlanguage{<inner-language>} ...}\selectlanguage{<outer-language>}
\end{verbatim}
  If you want a change which is really local, you must enclose this
  code with an additional grouping level.
\end{warning}

\Describe{\foreignlanguage}{\oarg{option-list}\marg{language}\marg{text}}

The command |\foreignlanguage| takes two arguments; the second argument
is a phrase to be typeset according to the rules of the language named
in its first one.

This command (1) only switches the extra definitions and the
hyphenation rules for the language, \emph{not} the names and dates, (2)
does not send information about the language to auxiliary files (i.e.,
the surrounding language is still in force), and (3) it works even if
the language has not been set as package option (but in such a case it
only sets the hyphenation patterns and a warning is shown). With the
|bidi| option, it also enters in horizontal mode (this is not done
always for backwards compatibility), and since it is meant for phrases
only the text direction (and not the paragraph one) is set.

\New{3.44} As already said, captions and dates are not switched.
However, with the optional argument you can switch them, too. So, you
can write:
\begin{verbatim}
\foreignlanguage[date]{polish}{\today}
\end{verbatim}
In addition, captions can be switched with |captions| (or both, of
course, with |date,| |captions|). Until 3.43 you had to write something
like |{\selectlanguage{..} ..}|, which was not always the most
convenient way.

\subsection{Auxiliary language selectors}

\Describe{\begin\menv{otherlanguage}}{\marg{language}\Eenv{otherlanguage}}

The environment \Lenv{otherlanguage} does basically the same as
|\selectlanguage|, except that language change is (mostly) local to
the environment.

Actually, there might be some non-local changes, as this environment
is roughly equivalent to:
\begin{verbatim}
\begingroup
\selectlanguage{<inner-language>}
...
\endgroup
\selectlanguage{<outer-language>}
\end{verbatim}
If you want a change which is really local, you must enclose this
environment with an additional grouping, like braces |{}|.

Spaces after the environment are ignored.

\Describe{\begin\menv{otherlanguage*}}%
{\oarg{option-list}\marg{language}\Eenv{otherlanguage*}}

Same as |\foreignlanguage| but as environment. Spaces after the
environment are \textit{not} ignored.

This environment was originally intended for intermixing left-to-right
typesetting with right-to-left typesetting in engines not supporting a
change in the writing direction inside a line. However, by default it
never complied with the documented behavior and it is just a version as
environment of |\foreignlanguage|, except when the option |bidi| is 
set -- in this case, |\foreignlanguage| emits a |\leavevmode|, while 
|otherlanguage*| does not.

\subsection{More on selection}

\Describe{\babeltags}{\char`\{\m{tag1} \texttt{=} \m{language1}, \m{tag2}
\texttt{=} \m{language2}, \dots\char`\}}

\New{3.9i} In multilingual documents with many language-switches the
commands above can be cumbersome. With this tool shorter names can be
defined. It adds nothing really new -- it is just syntactical sugar.

It defines |\text|\m{tag1}\marg{text} to be
|\foreignlanguage|\marg{language1}\marg{text}, and |\begin|\marg{tag1}
to be |\begin{otherlanguage*}|\marg{language1}, and so on. Note
|\|\m{tag1} is also allowed, but remember to set it locally inside a
group.

\begin{warning}
  There is a clear drawback to this feature, namely, the ‘prefix’
  |\text...| is heavily overloaded in \LaTeX{} and conflicts with
  existing macros may arise (|\textlatin|, |\textbar|, |\textit|,
  |\textcolor| and many others). The same applies to environments,
  because |arabic| conflicts with |\arabic|. Except if there is a
  reason for this ‘syntactical sugar’, the best option is to stick to
  the default selectors or to define your own alternatives. 
\end{warning}

\begin{example}
With
\begin{verbatim}
\babeltags{de = german}
\end{verbatim}
you can write
\begin{verbatim}
text \textde{German text} text
\end{verbatim}
and
\begin{verbatim}
text
\begin{de}
  German text
\end{de}
text
\end{verbatim}
\end{example}

\begin{note}
  Something like \verb|\babeltags{finnish = finnish}| is legitimate --
  it defines |\textfinnish| and |\finnish| (and, of course,
  |\begin{finnish}|).
\end{note}

\begin{note}
  Actually, there may be another advantage in the ‘short’ syntax
  |\text|\m{tag}, namely, it is not affected by |\MakeUppercase| (while
  |\foreignlanguage| is).
\end{note}

\Describe{\babelensure}{|[include=|\m{commands}|,exclude=|\m{commands}%
  |,fontenc=|\m{encoding}|]|\marg{language}}

\New{3.9i} Except in a few languages, like \textsf{russian},
captions and dates are just strings, and do not switch the
language. That means you should set it explicitly if you want to use
them, or hyphenation (and in some cases the text itself) will be
wrong. For example:
\begin{verbatim}
\foreignlanguage{russian}{text \foreignlanguage{polish}{\seename} text}
\end{verbatim}

Of course, \TeX{} can do it for you. To avoid switching the language
all the while, |\babelensure| redefines the captions for a given
language to wrap them with a selector:
\begin{verbatim}
\babelensure{polish}
\end{verbatim}
By default only the basic captions and |\today| are redefined, but you
can add further macros with the key |include| in the optional argument
(without commas). Macros not to be modified are listed in
|exclude|. You can also enforce a font encoding with the option
|fontenc|.\footnote{With it, encoded strings may not work as expected.}
A couple of examples:
\begin{verbatim}
\babelensure[include=\Today]{spanish}
\babelensure[fontenc=T5]{vietnamese}
\end{verbatim}

They are activated when the language is selected (at the |afterextras|
event), and it makes some assumptions which could not be fulfilled in
some languages. Note also you should include only macros defined by
the language, not global macros (eg, |\TeX| of |\dag|).

With |ini| files (see below), captions are ensured by default.

\subsection{Shorthands}

A \textit{shorthand} is a sequence of one or two characters that
expands to arbitrary \TeX{} code.

Shorthands can be used for different kinds of things; for example:
(1) in some languages shorthands such as |"a| are defined to be able
to hyphenate the word if the encoding is |OT1|; (2) in some languages
shorthands such as |!| are used to insert the right amount of white
space; (3) several kinds of discretionaries and breaks can be inserted
easily with |"-|, |"=|, etc.

The package \textsf{inputenc} as well as \xetex{} and \luatex{} have
alleviated entering non-ASCII characters, but minority languages and
some kinds of text can still require characters not directly available
on the keyboards (and sometimes not even as separated or precomposed
Unicode characters). As to the point 2, now \textsf{pdfTeX} provides
|\knbccode|, and \luatex{} can manipulate the glyph list. Tools for
point 3 can be still very useful in general.

There are four levels of shorthands: \textit{user}, \textit{language},
\textit{system}, and \textit{language user} (by order of precedence).
In most cases, you will use only shorthands provided by languages.

\begin{note} Keep in mind the following:
\begin{enumerate}
\item Activated chars used for two-char shorthands cannot be followed
  by a closing brace |}| and the spaces following are gobbled.  With
  one-char shorthands (eg,~|:|), they are preserved.
\item If on a certain level (system, language, user, language user)
  there is a one-char shorthand, two-char ones starting with that char
  and on the same level are ignored.
\item Since they are active, a shorthand cannot contain the same
  character in its definition (except if deactivated with, eg,
  |\string|).
\end{enumerate}
\end{note}

\begin{troubleshooting}
\trouble{Argument of \textbackslash language@active@arg"
has an extra \textbraceright}
A typical error when using shorthands is the following:
\begin{verbatim}
! Argument of \language@active@arg" has an extra }.
\end{verbatim}
It means there is a closing brace just after a shorthand, which is not
allowed (eg,~|"}|). Just add |{}| after (eg,~|"{}}|).
\end{troubleshooting}

\Describe{\shorthandon}{\marg{shorthands-list}}
\DescribeOther{\shorthandoff}{%
\colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}%
\marg{shorthands-list}}
It is sometimes necessary to switch a shorthand
character off temporarily, because it must be used in an
entirely different way. For this purpose, the user commands
|\shorthandoff| and |\shorthandon| are provided. They each take a
list of characters as their arguments.

The command |\shorthandoff| sets the |\catcode| for each of the
characters in its argument to other (12); the command |\shorthandon|
sets the |\catcode| to active (13). Both commands only work on `known'
shorthand characters.

% TODO - Is the following true ????
% If a character is not known to be a shorthand character its category
% code will be left unchanged.

\New{3.9a} However, |\shorthandoff| does not behave as
you would expect with characters like |~| or |^|, because they
usually are not ``other''. For them |\shorthandoff*| is provided,
so that with
\begin{verbatim}
\shorthandoff*{~^}
\end{verbatim}
|~| is still active, very likely with the meaning of a non-breaking
space, and |^| is the superscript character. The catcodes used are
those when the shorthands are defined, usually when language files are
loaded.

If you do not need shorthands, or prefer an alternative approach of
your own, you may want to switch them off with the package option
|shorthands=off|, as described below.

\Describe{\useshorthands}{%
\colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}%
\marg{char}}

The command |\useshorthands| initiates the definition of user-defined
shorthand sequences. It has one argument, the character that starts
these personal shorthands.

\New{3.9a} User shorthands are not always alive, as they may
be deactivated by languages (for example, if you use |"| for your user
shorthands and switch from \textsf{german} to \textsf{french}, they
stop working). Therefore, a starred version
|\useshorthands*|\marg{char} is provided, which makes sure shorthands
are always activated.

Currently, if the package option |shorthands| is used, you must include any
character to be activated with |\useshorthands|. This restriction will
be lifted in a future release.  % <- TODO

\Describe\defineshorthand{\texttt{[}\langlist\texttt{]}%
     \marg{shorthand}\marg{code}}

The command |\defineshorthand| takes two arguments: the first is
a one- or two-character shorthand sequence, and the second is the
code the shorthand should expand to.

\New{3.9a} An optional argument allows to (re)define language and
system shorthands (some languages do not activate shorthands, so you
may want to add |\languageshorthands|\marg{lang} to the corresponding
|\extras|\m{lang}, as explained below). By default, user shorthands
are (re)defined.

User shorthands override language ones, which in turn override
system shorthands. Language-dependent user shorthands (new in
3.9) take precedence over ``normal'' user shorthands.

\begin{example}
  Let's assume you want a unified set of shorthand for discretionaries
  (languages do not define shorthands consistently, and |"-|, |\-|,
  |"=| have different meanings).  You can start with, say:
\begin{verbatim}
\useshorthands*{"}
\defineshorthand{"*}{\babelhyphen{soft}}
\defineshorthand{"-}{\babelhyphen{hard}}
\end{verbatim}
  However, the behavior of hyphens is language-dependent. For example, in
  languages like Polish and Portuguese, a hard hyphen inside compound
  words are repeated at the beginning of the next line. You can then
  set:
\begin{verbatim}
\defineshorthand[*polish,*portuguese]{"-}{\babelhyphen{repeat}}
\end{verbatim}
  Here, options with |*| set a language-dependent user shorthand,
  which means the generic one above only applies for the rest of
  languages; without |*| they would (re)define the language shorthands
  instead, which are overridden by user ones.

  Now, you have a single unified shorthand (|"-|), with a
  content-based meaning (`compound word hyphen') whose visual behavior
  is that expected in each context.
\end{example}

\Describe{\languageshorthands}{\marg{language}} The command
|\languageshorthands| can be used to switch the shorthands on the
language level. It takes one argument, the name of a language or
|none| (the latter does what its name suggests).\footnote{Actually,
any name not corresponding to a language group does the same as
\texttt{none}. However, follow this convention because it might be
enforced in future releases of \babel{} to catch possible errors.}
Note that for this to work the language should have been specified as
an option when loading the \babel\ package.  For example, you can use
in \textsf{english} the shorthands defined by \textsf{ngerman} with
\begin{verbatim}
\addto\extrasenglish{\languageshorthands{ngerman}}
\end{verbatim}
(You may also need to activate them as user shorthands in the preamble
with, for example, |\useshorthands| or |\useshorthands*|.)

\begin{example}
  Very often, this is a more convenient way to deactivate shorthands
  than |\shorthandoff|, for example if you want to define a macro
  to easy typing phonetic characters with \textsf{tipa}:
\begin{verbatim}
\newcommand{\myipa}[1]{{_\languageshorthands{none}_\tipaencoding#1}}
\end{verbatim}
\end{example}

\Describe{\babelshorthand}{\marg{shorthand}}
With this command you can use a shorthand even if (1) not activated in
\texttt{shorthands} (in this case only shorthands for the current
language are taken into account, ie, not user shorthands), (2) turned
off with |\shorthandoff| or (3) deactivated with the internal
|\bbl@deactivate|; for example, \verb|\babelshorthand{"u}| or
\verb|\babelshorthand{:}|.  (You can conveniently define your own
macros, or even your own user shorthands provided they do not overlap.)

\begin{example}
  Since by default shorthands are not activated until
  |\begin{document}|, you may use this macro when defining the |\title|
  in the preamble:
\begin{verbatim}
\title{Documento científico_\babelshorthand{"-}_técnico}
\end{verbatim}
\end{example}

\bigskip

For your records, here is a list of shorthands, but you must double
check them, as they may change:\footnote{Thanks to Enrico Gregorio}

\begin{description}
\itemsep=-\parskip
\item[Languages with no shorthands] Croatian, English (any variety),
  Indonesian, Hebrew, Interlingua, Irish, Lower Sorbian, Malaysian,
  North Sami, Romanian, Scottish, Welsh
\item[Languages with only \texttt{"} as defined shorthand character]
  Albanian, Bulgarian, Danish, Dutch, Finnish, German (old and new
  orthography, also Austrian), Icelandic, Italian, Norwegian, Polish,
  Portuguese (also Brazilian), Russian, Serbian (with Latin script),
  Slovene, Swedish, Ukrainian, Upper Sorbian
\item[Basque] |" ' ~|
\item[Breton] |: ; ? !|
\item[Catalan] |" ' `|
\item[Czech] |" -|
\item[Esperanto] |^|
\item[Estonian] |" ~|
\item[French] (all varieties) |: ; ? !|
\item[Galician] |" . ' ~ < >|
\item[Greek] |~|
\item[Hungarian] |`|
\item[Kurmanji] |^|
\item[Latin] |" ^ =|
\item[Slovak] |" ^ ' -|
\item[Spanish] |" . < > ' ~|
\item[Turkish] |: ! =|
\end{description}
In addition, the \babel{} core declares |~| as a one-char shorthand
which is let, like the standard |~|, to a non breaking
space.\footnote{This declaration serves to nothing, but it is
preserved for backward compatibility.}

\Describe\ifbabelshorthand{\marg{character}\marg{true}\marg{false}}

\New{3.23} Tests if a character has been made a shorthand.

\Describe{\aliasshorthand}{\marg{original}\marg{alias}}

The command |\aliasshorthand| can be used to let another character
perform the same functions as the default shorthand character. If one
prefers for example to use the character |/| over |"| in typing Polish
texts, this can be achieved by entering |\aliasshorthand{"}{/}|. For
the reasons in the warning below, usage of this macro is not
recommended.

\begin{note}
  The substitute character must \textit{not} have been declared before
  as shorthand (in such a case, |\aliashorthands| is ignored).
\end{note}

\begin{example}
  The following example shows how to replace a shorthand by another
\begin{verbatim}
\aliasshorthand{~}{^}
\AtBeginDocument{\shorthandoff*{~}}
\end{verbatim}
\end{example}

\begin{warning}
  Shorthands remember somehow the original character, and the fallback
  value is that of the latter. So, in this example, if no shorthand if
  found, |^| expands to a non-breaking space, because this is the
  value of |~| (internally, |^| still calls |\active@char~| or
  |\normal@char~|). Furthermore, if you change the |system| value of
  |^| with |\defineshorthand| nothing happens.
\end{warning}

\subsection{Package options}

\New{3.9a}
These package options are processed before language options, so
that they are taken into account irrespective of its order. The first
three options have been available in previous versions.

\Describe{KeepShorthandsActive}{}
Tells babel not to deactivate shorthands after loading a language
file, so that they are also available in the preamble.

\Describe{activeacute}{} For some languages \babel\ supports this
options to set |'| as a shorthand in case it is not done by default.

\Describe{activegrave}{}
Same for |`|.

\Describe{shorthands=}{\meta{char}\meta{char}...
$\string|$ \texttt{off}}
The only language shorthands activated
are those given, like, eg:
\begin{verbatim}
\usepackage[esperanto,french,_shorthands=:;!?_]{babel}
\end{verbatim}
If \verb|'| is included, \texttt{activeacute} is set; if \verb|`| is
included, \texttt{activegrave} is set.  Active characters (like
\verb|~|) should be preceded by \verb|\string| (otherwise they will be
expanded by \LaTeX{} before they are passed to the package and
therefore they will not be recognized); however, |t| is provided for
the common case of |~| (as well as |c| for not so common case of the
comma).

With |shorthands=off| no language shorthands are defined,
As some languages use this mechanism for tools not available
otherwise, a macro \verb|\babelshorthand| is defined, which allows
using them; see above.

\Describe{safe=}{\texttt{none} $\string|$ \texttt{ref} $\string|$
\texttt{bib}} Some \LaTeX{} macros are redefined so that using
shorthands is safe. With \texttt{safe=bib} only |\nocite|, |\bibcite|
and |\bibitem| are redefined. With |safe=ref| only |\newlabel|, |\ref|
and |\pageref| are redefined (as well as a few macros from
\textsf{varioref} and \textsf{ifthen}).

With |safe=none| no macro is redefined. This option is strongly
recommended, because a good deal of incompatibilities and errors are
related to these redefinitions. As of \New{3.34}, in $\epsilon$\TeX{}
based engines (ie, almost every engine except the oldest ones)
shorthands can be used in these macros (formerly you could not).

\Describe{math=}{\texttt{active} $\string|$ \texttt{normal}}
Shorthands are mainly intended for text, not for math. By setting this
option with the value |normal| they are deactivated in math mode
(default is |active|) and things like |${a'}$| (a closing brace after
a shorthand) are not a source of trouble anymore.

\Describe{config=}{\meta{file}} Load \meta{file}\texttt{.cfg} instead
of the default config file |bblopts.cfg| (the file is loaded even
with |noconfigs|).

\Describe{main=}{\meta{language}} Sets the main language, as explained
above, ie, this language is always loaded last. If it is not given as
package or global option, it is added to the list of requested
languages.

\Describe{headfoot=}{\meta{language}} By default, headlines and
footlines are not touched (only marks), and if they contain
language-dependent macros (which is not usual) there may be unexpected
results. With this option you may set the language in heads and foots.

\Describe{noconfigs}{} Global and language default config files are
not loaded, so you can make sure your document is not spoilt by an
unexpected \texttt{.cfg} file. However, if the key |config| is set,
this file is loaded.

\Describe{showlanguages}{} Prints to the log the list of languages
loaded when the format was created: number (remember dialects can
share it), name, hyphenation file and exceptions file.

\Describe{nocase}{} \New{3.9l} Language settings for uppercase and
lowercase mapping (as set by |\SetCase|) are ignored. Use only if there
are incompatibilities with other packages.

\Describe{silent}{} \New{3.9l} No warnings and no \textit{infos} are
written to the log file.\footnote{You can use alternatively the
package \textsf{silence}.}

\Describe{strings=}{\texttt{generic} $\string|$ \texttt{unicode}
$\string|$ \texttt{encoded} $\string|$ \meta{label} $\string|$
\meta{font encoding}} Selects the encoding of strings in languages
supporting this feature. Predefined labels are |generic| (for
traditional \TeX, LICR and ASCII strings), |unicode| (for engines like
\xetex{} and \luatex) and |encoded| (for special cases requiring mixed
encodings). Other allowed values are font encoding codes (|T1|, |T2A|,
|LGR|, |L7X|...), but only in languages supporting them. Be aware with
|encoded| captions are protected, but they work in |\MakeUppercase|
and the like (this feature misuses some internal \LaTeX\ tools, so use
it only as a last resort).

\Describe{hyphenmap=}{\texttt{off} $\string|$ \texttt{first}
$\string|$ \texttt{select} $\string|$ \texttt{other} $\string|$
\texttt{other*}}

\New{3.9g} Sets the behavior of case mapping for hyphenation,
provided the language defines it.\footnote{Turned off in plain.} It
can take the following values:
\begin{description}
\renewcommand\makelabel[1]{%
  \hspace\labelsep\normalfont\ttfamily\color{thered}#1}
\itemsep=-\parskip
\item[off] deactivates this feature and no case mapping is applied;
\item[first] sets it at the first switching commands in the
  current or parent scope (typically, when the aux file is first read
  and at |\begin{document}|, but also the first |\selectlanguage| in
    the preamble), and it's the default if a single
    language option has been stated;\footnote{Duplicated options count
    as several ones.}
\item[select] sets it only at |\selectlanguage|;
\item[other] also sets it at |otherlanguage|;
\item[other*] also sets it at |otherlanguage*| as well as in heads and
  foots (if the option |headfoot| is used) and in auxiliary files (ie,
  at |\select@language|), and it's the default if several language
  options have been stated. The option |first| can be regarded as an
  optimized version of \texttt{other*} for monolingual
  documents.\footnote{Providing |foreign| is pointless, because the
  case mapping applied is that at the end of the paragraph, but if either
  \xetex{} or \luatex{} change this behavior it might be added. On
  the other hand, |other| is provided even if I [JBL] think it isn't
  really useful, but who knows.}
\end{description}

\Describe{bidi=}{\texttt{default} $\string|$ \texttt{basic}
  $\string|$ \texttt{basic-r} $\string|$ \texttt{bidi-l} $\string|$
  \texttt{bidi-r}}

\New{3.14} Selects the bidi algorithm to be used in \luatex{} and
\xetex{}. See sec.~\ref{bidi}.

\Describe{layout=}{}

\New{3.16} Selects which layout elements are adapted in bidi
documents. See sec.~\ref{bidi}.

\subsection{The \texttt{base} option}

With this package option \babel{} just loads some basic macros (those
in |switch.def|), defines |\AfterBabelLanguage| and exits. It also
selects the hyphenation patterns for the last language passed as
option (by its name in |language.dat|). There are two main uses:
classes and packages, and as a last resort in case there are, for some
reason, incompatible languages. It can be used if you just want to
select the hyphenation patterns of a single language, too.
% TODO: example

\Describe\AfterBabelLanguage{\marg{option-name}\marg{code}}

This command is currently the only provided by |base|. Executes
\meta{code} when the file loaded by the corresponding package option
is finished (at |\ldf@finish|). The setting is global. So
\begin{verbatim}
\AfterBabelLanguage{french}{...}
\end{verbatim}
does ... at the end of |french.ldf|. It can be used in |ldf| files,
too, but in such a case the code is executed only if
\meta{option-name} is the same as |\CurrentOption| (which could not
be the same as the option name as set in |\usepackage|!).

\begin{example}
  Consider two languages \textsf{foo} and \textsf{bar} defining the
  same |\macro| with |\newcommand|. An error is raised if you attempt
  to load both. Here is a way to overcome this problem:
\begin{verbatim}
\usepackage[base]{babel}
\AfterBabelLanguage{foo}{%
  \let\macroFoo\macro
  \let\macro\relax}
\usepackage[foo,bar]{babel}
\end{verbatim}
\end{example}

\begin{warning}
  Currently this option is not compatible with languages loaded on the
  fly.
\end{warning}

\subsection{\texttt{ini} files}
\label{inifiles}

An alternative approach to define a language (or, more precisely, a
\textit{locale}) is by means of an \texttt{ini} file. Currently
\babel{} provides about 200 of these files containing the basic data
required for a locale. 

|ini| files are not meant only for \babel, and they has been devised as
a resource for other packages. To easy interoperability between \TeX{}
and other systems, they are identified with the BCP 47 codes as
preferred by the Unicode Common Locale Data Repository, which was
used as source for most of the data provided by these files, too (the
main exception being the |\...name| strings).

Most of them set the date, and many also the captions (Unicode and
LICR). They will be evolving with the time to add more features
(something to keep in mind if backward compatibility is important). The
following section shows how to make use of them by means of
|\babelprovide|. In other words, |\babelprovide| is mainly meant
for auxiliary tasks, and as alternative when the |ldf|, for some
reason, does work as expected.

\begin{example}
  Although Georgian has its own \texttt{ldf} file, here is how to
  declare this language with an |ini| file in Unicode engines.
\begingroup
\setmonofont[Scale=.87,Script=Georgian]{DejaVu Sans Mono}
\setengine{luatex/xetex}
\begin{verbatim}
\documentclass{book}

\usepackage{babel}
_\babelprovide[import, main]{georgian}_

\babelfont{rm}[Renderer=Harfbuzz]{DejaVu Sans}

\begin{document}

\tableofcontents

\chapter{სამზარეულო და სუფრის ტრადიციები}

ქართული ტრადიციული სამზარეულო ერთ-ერთი უმდიდრესია მთელ მსოფლიოში.

\end{document}
\end{verbatim}
\endgroup
\end{example}

\New{3.49} Alternatively, you can tell babel to load all or some
languages passed as options with |\babelprovide| and not from the |ldf|
file in a few few typical cases. Thus, |provide=*| means ‘load the main
language with the |\babelprovide| mechanism instead of the |ldf| file’
applying the basic features, which in this case means |import,| |main|.
There are (currently) three options:
\begin{itemize}
\item |provide=*| is the option just explained, for the main language;
\item |provide+=*| is the same for additional languages (the main
  language is still the |ldf| file);
\item |provide*=*| is the same for all languages, ie, main and
  additional.
\end{itemize}

\begin{example}
  The preamble in the previous example can be more compactly written
  as:
\begin{verbatim}
\documentclass{book}
\usepackage[_georgian, provide=*_]{babel}
\babelfont{rm}[Renderer=Harfbuzz]{DejaVu Sans}
\end{verbatim}
Or also:
\begin{verbatim}
\documentclass[_georgian_]{book}
\usepackage[_provide=*_]{babel}
\babelfont{rm}[Renderer=Harfbuzz]{DejaVu Sans}
\end{verbatim}
\end{example}

\begin{note}
  The \texttt{ini} files just define and set some parameters, but the
  corresponding behavior is not always implemented. Also, there are
  some limitations in the engines. A few remarks follow (which could no
  longer be valid when you read this manual, if the packages involved
  han been updated). The Harfbuzz renderer has still some issues, so as
  a rule of thumb prefer the default renderer, and resort to Harfbuzz
  only if the former does not work for you. Fortunately, fonts can be
  loaded twice with different renderers; for example:
\begin{verbatim}
\babelfont[spanish]{rm}{FreeSerif}  
\babelfont[hindi]{rm}[Renderer=Harfbuzz]{FreeSerif}
\end{verbatim}
\begin{description}
\itemsep=-\parskip
\item[Arabic] Monolingual documents mostly work in \luatex, but it must
  be fine tuned, particularly graphical elements like |picture|. In \xetex{}
  \babel{} resorts to the \textsf{bidi} package, which seems to work.
\item[Hebrew] Niqqud marks seem to work in both engines, but depending 
  on the font cantillation marks might be misplaced (\xetex{} or
  \luatex{} with Harfbuzz seems better, but still problematic).
\item[Devanagari] In \luatex{} and the the default renderer many fonts
work, but some others do not, the main issue being the ‘ra’. You may
need to set explicitly the script to either |deva| or |dev2|, eg:
\begin{verbatim}
\newfontscript{Devanagari}{deva}
\end{verbatim}  
  Other Indic scripts are still under development in the default
  \luatex{} renderer, but should work with |Renderer=Harfbuzz|. They
  also work with \xetex{}, although unlike with \luatex{} fine tuning
  the font behavior is not always possible.
\item[Southeast scripts] Thai works in both \luatex{} and \xetex{}, but
  line breaking differs (rules can be modified in \luatex; they are
  hard-coded in \xetex). Lao seems to work, too, but there are no
  patterns for the latter in \luatex{}. Khemer clusters are rendered
  wrongly with the default renderer. The comment about Indic scripts
  and \textsf{lualatex} also applies here. Some quick patterns can
  help, with something similar to:
\begingroup
\setmonofont[Script=Lao,Scale=MatchLowercase]{DejaVu Sans Mono}
\begin{verbatim}
\babelprovide[import, hyphenrules=+]{lao}
\babelpatterns[lao]{1ດ 1ມ 1ອ 1ງ 1ກ 1າ} % Random
\end{verbatim}
\endgroup
\item[East Asia scripts] Settings for either Simplified of Traditional
  should work out of the box, with basic line breaking with any
  renderer. Although for a few words and shorts texts the |ini| files
  should be fine, CJK texts are best set with a dedicated framework
  (\textsf{CJK}, \textsf{luatexja}, \textsf{kotex}, \textsf{CTeX},
  etc.). This is what the class |ltjbook| does with \luatex, which can
  be used in conjunction with the |ldf| for |japanese|, because the
  following piece of code loads \textsf{luatexja}:
\begin{verbatim}
\documentclass[japanese]{ltjbook}
\usepackage{babel}
\end{verbatim}
\item[Latin, Greek, Cyrillic] Combining chars with the default
 \luatex{} font renderer might be wrong; on then other hand, with the
 Harfbuzz renderer diacritics are stacked correctly, but many
 hyphenations points are discarded (this bug seems related to kerning,
 so it depends on the font). With \xetex{} both combining characters
 and hyphenation work as expected (not quite, but in most cases it
 works; the problem here are font clusters).
\end{description}
\end{note}

\begin{note}
  Wikipedia defines a \textit{locale} as follows: “In computing, a
  locale is a set of parameters that defines the user’s language,
  region and any special variant preferences that the user wants to see
  in their user interface. Usually a locale identifier consists of at
  least a language code and a country/region code.” \Babel{} is moving
  gradually from the old and fuzzy concept of \textit{language} to the
  more modern of \textit{locale}. Note each locale is by itself a
  separate “language”, which explains why there are so many files. This
  is on purpose, so that possible variants can be created and/or
  redefined easily.
\end{note}

Here is the list (u means Unicode captions, and l means LICR
captions):

\begingroup
\bigskip\hrule\nobreak

\makeatletter
\def\tag#1{\par\@hangfrom{\makebox[7em][l]{#1}}\ignorespaces}
\def\hascapu{\textsuperscript{u}}
\def\hascapl{\textsuperscript{l}}

\begin{multicols}{2}

\tag{af} Afrikaans\hascapu\hascapl
\tag{agq} Aghem
\tag{ak} Akan
\tag{am} Amharic\hascapu\hascapl
\tag{ar} Arabic\hascapu\hascapl
\tag{ar-DZ} Arabic\hascapu\hascapl
\tag{ar-MA} Arabic\hascapu\hascapl
\tag{ar-SY} Arabic\hascapu\hascapl
\tag{as} Assamese
\tag{asa} Asu
\tag{ast} Asturian\hascapu\hascapl
\tag{az-Cyrl} Azerbaijani
\tag{az-Latn} Azerbaijani
\tag{az} Azerbaijani\hascapu\hascapl
\tag{bas} Basaa
\tag{be} Belarusian\hascapu\hascapl
\tag{bem} Bemba
\tag{bez} Bena
\tag{bg} Bulgarian\hascapu\hascapl
\tag{bm} Bambara
\tag{bn} Bangla\hascapu\hascapl
\tag{bo} Tibetan\hascapu
\tag{brx} Bodo
\tag{bs-Cyrl} Bosnian
\tag{bs-Latn} Bosnian\hascapu\hascapl
\tag{bs} Bosnian\hascapu\hascapl
\tag{ca} Catalan\hascapu\hascapl
\tag{ce} Chechen
\tag{cgg} Chiga
\tag{chr} Cherokee
\tag{ckb} Central Kurdish
\tag{cop} Coptic
\tag{cs} Czech\hascapu\hascapl
\tag{cu} Church Slavic
\tag{cu-Cyrs} Church Slavic
\tag{cu-Glag} Church Slavic
\tag{cy} Welsh\hascapu\hascapl
\tag{da} Danish\hascapu\hascapl
\tag{dav} Taita
\tag{de-AT} German\hascapu\hascapl
\tag{de-CH} German\hascapu\hascapl
\tag{de} German\hascapu\hascapl
\tag{dje} Zarma
\tag{dsb} Lower Sorbian\hascapu\hascapl
\tag{dua} Duala
\tag{dyo} Jola-Fonyi
\tag{dz} Dzongkha
\tag{ebu} Embu
\tag{ee} Ewe
\tag{el} Greek\hascapu\hascapl
\tag{el-polyton} Polytonic Greek\hascapu\hascapl
\tag{en-AU} English\hascapu\hascapl
\tag{en-CA} English\hascapu\hascapl
\tag{en-GB} English\hascapu\hascapl
\tag{en-NZ} English\hascapu\hascapl
\tag{en-US} English\hascapu\hascapl
\tag{en} English\hascapu\hascapl
\tag{eo} Esperanto\hascapu\hascapl
\tag{es-MX} Spanish\hascapu\hascapl
\tag{es} Spanish\hascapu\hascapl
\tag{et} Estonian\hascapu\hascapl
\tag{eu} Basque\hascapu\hascapl
\tag{ewo} Ewondo
\tag{fa} Persian\hascapu\hascapl
\tag{ff} Fulah
\tag{fi} Finnish\hascapu\hascapl
\tag{fil} Filipino
\tag{fo} Faroese
\tag{fr} French\hascapu\hascapl
\tag{fr-BE} French\hascapu\hascapl
\tag{fr-CA} French\hascapu\hascapl
\tag{fr-CH} French\hascapu\hascapl
\tag{fr-LU} French\hascapu\hascapl
\tag{fur} Friulian\hascapu\hascapl
\tag{fy} Western Frisian
\tag{ga} Irish\hascapu\hascapl
\tag{gd} Scottish Gaelic\hascapu\hascapl
\tag{gl} Galician\hascapu\hascapl
\tag{grc} Ancient Greek\hascapu\hascapl
\tag{gsw} Swiss German
\tag{gu} Gujarati
\tag{guz} Gusii
\tag{gv} Manx
\tag{ha-GH} Hausa
\tag{ha-NE} Hausa\hascapl
\tag{ha} Hausa
\tag{haw} Hawaiian
\tag{he} Hebrew\hascapu\hascapl
\tag{hi} Hindi\hascapu
\tag{hr} Croatian\hascapu\hascapl
\tag{hsb} Upper Sorbian\hascapu\hascapl
\tag{hu} Hungarian\hascapu\hascapl
\tag{hy} Armenian\hascapu
\tag{ia} Interlingua\hascapu\hascapl
\tag{id} Indonesian\hascapu\hascapl
\tag{ig} Igbo
\tag{ii} Sichuan Yi
\tag{is} Icelandic\hascapu\hascapl
\tag{it} Italian\hascapu\hascapl
\tag{ja} Japanese
\tag{jgo} Ngomba
\tag{jmc} Machame
\tag{ka} Georgian\hascapu\hascapl
\tag{kab} Kabyle
\tag{kam} Kamba
\tag{kde} Makonde
\tag{kea} Kabuverdianu
\tag{khq} Koyra Chiini
\tag{ki} Kikuyu
\tag{kk} Kazakh
\tag{kkj} Kako
\tag{kl} Kalaallisut
\tag{kln} Kalenjin
\tag{km} Khmer
\tag{kn} Kannada\hascapu\hascapl
\tag{ko} Korean
\tag{kok} Konkani
\tag{ks} Kashmiri
\tag{ksb} Shambala
\tag{ksf} Bafia
\tag{ksh} Colognian
\tag{kw} Cornish
\tag{ky} Kyrgyz
\tag{lag} Langi
\tag{lb} Luxembourgish
\tag{lg} Ganda
\tag{lkt} Lakota
\tag{ln} Lingala
\tag{lo} Lao\hascapu\hascapl
\tag{lrc} Northern Luri
\tag{lt} Lithuanian\hascapu\hascapl
\tag{lu} Luba-Katanga
\tag{luo} Luo
\tag{luy} Luyia
\tag{lv} Latvian\hascapu\hascapl
\tag{mas} Masai
\tag{mer} Meru
\tag{mfe} Morisyen
\tag{mg} Malagasy
\tag{mgh} Makhuwa-Meetto
\tag{mgo} Metaʼ
\tag{mk} Macedonian\hascapu\hascapl
\tag{ml} Malayalam\hascapu\hascapl
\tag{mn} Mongolian
\tag{mr} Marathi\hascapu\hascapl
\tag{ms-BN} Malay\hascapl
\tag{ms-SG} Malay\hascapl
\tag{ms} Malay\hascapu\hascapl
\tag{mt} Maltese
\tag{mua} Mundang
\tag{my} Burmese
\tag{mzn} Mazanderani
\tag{naq} Nama
\tag{nb} Norwegian Bokmål\hascapu\hascapl
\tag{nd} North Ndebele
\tag{ne} Nepali
\tag{nl} Dutch\hascapu\hascapl
\tag{nmg} Kwasio
\tag{nn} Norwegian Nynorsk\hascapu\hascapl
\tag{nnh} Ngiemboon
\tag{nus} Nuer
\tag{nyn} Nyankole
\tag{om} Oromo
\tag{or} Odia
\tag{os} Ossetic
\tag{pa-Arab} Punjabi
\tag{pa-Guru} Punjabi
\tag{pa} Punjabi
\tag{pl} Polish\hascapu\hascapl
\tag{pms} Piedmontese\hascapu\hascapl
\tag{ps} Pashto
\tag{pt-BR} Portuguese\hascapu\hascapl
\tag{pt-PT} Portuguese\hascapu\hascapl
\tag{pt} Portuguese\hascapu\hascapl
\tag{qu} Quechua
\tag{rm} Romansh\hascapu\hascapl
\tag{rn} Rundi
\tag{ro} Romanian\hascapu\hascapl
\tag{rof} Rombo
\tag{ru} Russian\hascapu\hascapl
\tag{rw} Kinyarwanda
\tag{rwk} Rwa
\tag{sa-Beng} Sanskrit
\tag{sa-Deva} Sanskrit
\tag{sa-Gujr} Sanskrit
\tag{sa-Knda} Sanskrit
\tag{sa-Mlym} Sanskrit
\tag{sa-Telu} Sanskrit
\tag{sa} Sanskrit
\tag{sah} Sakha
\tag{saq} Samburu
\tag{sbp} Sangu
\tag{se} Northern Sami\hascapu\hascapl
\tag{seh} Sena
\tag{ses} Koyraboro Senni
\tag{sg} Sango
\tag{shi-Latn} Tachelhit
\tag{shi-Tfng} Tachelhit
\tag{shi} Tachelhit
\tag{si} Sinhala
\tag{sk} Slovak\hascapu\hascapl
\tag{sl} Slovenian\hascapu\hascapl
\tag{smn} Inari Sami
\tag{sn} Shona
\tag{so} Somali
\tag{sq} Albanian\hascapu\hascapl
\tag{sr-Cyrl-BA} Serbian\hascapu\hascapl
\tag{sr-Cyrl-ME} Serbian\hascapu\hascapl
\tag{sr-Cyrl-XK} Serbian\hascapu\hascapl
\tag{sr-Cyrl} Serbian\hascapu\hascapl
\tag{sr-Latn-BA} Serbian\hascapu\hascapl
\tag{sr-Latn-ME} Serbian\hascapu\hascapl
\tag{sr-Latn-XK} Serbian\hascapu\hascapl
\tag{sr-Latn} Serbian\hascapu\hascapl
\tag{sr} Serbian\hascapu\hascapl
\tag{sv} Swedish\hascapu\hascapl
\tag{sw} Swahili
\tag{ta} Tamil\hascapu
\tag{te} Telugu\hascapu\hascapl
\tag{teo} Teso
\tag{th} Thai\hascapu\hascapl
\tag{ti} Tigrinya
\tag{tk} Turkmen\hascapu\hascapl
\tag{to} Tongan
\tag{tr} Turkish\hascapu\hascapl
\tag{twq} Tasawaq
\tag{tzm} Central Atlas Tamazight
\tag{ug} Uyghur
\tag{uk} Ukrainian\hascapu\hascapl
\tag{ur} Urdu\hascapu\hascapl
\tag{uz-Arab} Uzbek
\tag{uz-Cyrl} Uzbek
\tag{uz-Latn} Uzbek
\tag{uz} Uzbek
\tag{vai-Latn} Vai
\tag{vai-Vaii} Vai
\tag{vai} Vai
\tag{vi} Vietnamese\hascapu\hascapl
\tag{vun} Vunjo
\tag{wae} Walser
\tag{xog} Soga
\tag{yav} Yangben
\tag{yi} Yiddish
\tag{yo} Yoruba
\tag{yue} Cantonese
\tag{zgh} Standard Moroccan Tamazight
\tag{zh-Hans-HK} Chinese
\tag{zh-Hans-MO} Chinese
\tag{zh-Hans-SG} Chinese
\tag{zh-Hans} Chinese
\tag{zh-Hant-HK} Chinese
\tag{zh-Hant-MO} Chinese
\tag{zh-Hant} Chinese
\tag{zh} Chinese
\tag{zu} Zulu

\end{multicols}
\endgroup
\hrule
\bigskip

In some contexts (currently |\babelfont|) an \texttt{ini} file may be
loaded by its name. Here is the list of the names currently supported.
With these languages, |\babelfont| loads (if not done before) the
language and script names (even if the language is defined as a package
option with an \textsf{ldf} file). These are also the names recognized 
by |\babelprovide| with a valueless |import|.

\begingroup
\bigskip\hrule\nobreak

\let\\\par

\begin{multicols}{2}

aghem\\
akan\\
albanian\\
american\\
amharic\\
ancientgreek\\
arabic\\
arabic-algeria\\
arabic-DZ\\
arabic-morocco\\
arabic-MA\\
arabic-syria\\
arabic-SY\\
armenian\\
assamese\\
asturian\\
asu\\
australian\\
austrian\\
azerbaijani-cyrillic\\
azerbaijani-cyrl\\
azerbaijani-latin\\
azerbaijani-latn\\
azerbaijani\\
bafia\\
bambara\\
basaa\\
basque\\
belarusian\\
bemba\\
bena\\
bengali\\
bodo\\
bosnian-cyrillic\\
bosnian-cyrl\\
bosnian-latin\\
bosnian-latn\\
bosnian\\
brazilian\\
breton\\
british\\
bulgarian\\
burmese\\
canadian\\
cantonese\\
catalan\\
centralatlastamazight\\
centralkurdish\\
chechen\\
cherokee\\
chiga\\
chinese-hans-hk\\
chinese-hans-mo\\
chinese-hans-sg\\
chinese-hans\\
chinese-hant-hk\\
chinese-hant-mo\\
chinese-hant\\
chinese-simplified-hongkongsarchina\\
chinese-simplified-macausarchina\\
chinese-simplified-singapore\\
chinese-simplified\\
chinese-traditional-hongkongsarchina\\
chinese-traditional-macausarchina\\
chinese-traditional\\
chinese\\
churchslavic\\
churchslavic-cyrs\\
churchslavic-oldcyrillic\footnote{The name in the CLDR
is Old Church Slavonic Cyrillic, but it has been shortened
for practical reasons.}\\
churchsslavic-glag\\
churchsslavic-glagolitic\\
colognian\\
cornish\\
croatian\\
czech\\
danish\\
duala\\
dutch\\
dzongkha\\
embu\\
english-au\\
english-australia\\
english-ca\\
english-canada\\
english-gb\\
english-newzealand\\
english-nz\\
english-unitedkingdom\\
english-unitedstates\\
english-us\\
english\\
esperanto\\
estonian\\
ewe\\
ewondo\\
faroese\\
filipino\\
finnish\\
french-be\\
french-belgium\\
french-ca\\
french-canada\\
french-ch\\
french-lu\\
french-luxembourg\\
french-switzerland\\
french\\
friulian\\
fulah\\
galician\\
ganda\\
georgian\\
german-at\\
german-austria\\
german-ch\\
german-switzerland\\
german\\
greek\\
gujarati\\
gusii\\
hausa-gh\\
hausa-ghana\\
hausa-ne\\
hausa-niger\\
hausa\\
hawaiian\\
hebrew\\
hindi\\
hungarian\\
icelandic\\
igbo\\
inarisami\\
indonesian\\
interlingua\\
irish\\
italian\\
japanese\\
jolafonyi\\
kabuverdianu\\
kabyle\\
kako\\
kalaallisut\\
kalenjin\\
kamba\\
kannada\\
kashmiri\\
kazakh\\
khmer\\
kikuyu\\
kinyarwanda\\
konkani\\
korean\\
koyraborosenni\\
koyrachiini\\
kwasio\\
kyrgyz\\
lakota\\
langi\\
lao\\
latvian\\
lingala\\
lithuanian\\
lowersorbian\\
lsorbian\\
lubakatanga\\
luo\\
luxembourgish\\
luyia\\
macedonian\\
machame\\
makhuwameetto\\
makonde\\
malagasy\\
malay-bn\\
malay-brunei\\
malay-sg\\
malay-singapore\\
malay\\
malayalam\\
maltese\\
manx\\
marathi\\
masai\\
mazanderani\\
meru\\
meta\\
mexican\\
mongolian\\
morisyen\\
mundang\\
nama\\
nepali\\
newzealand\\
ngiemboon\\
ngomba\\
norsk\\
northernluri\\
northernsami\\
northndebele\\
norwegianbokmal\\
norwegiannynorsk\\
nswissgerman\\
nuer\\
nyankole\\
nynorsk\\
occitan\\
oriya\\
oromo\\
ossetic\\
pashto\\
persian\\
piedmontese\\
polish\\
polytonicgreek\\
portuguese-br\\
portuguese-brazil\\
portuguese-portugal\\
portuguese-pt\\
portuguese\\
punjabi-arab\\
punjabi-arabic\\
punjabi-gurmukhi\\
punjabi-guru\\
punjabi\\
quechua\\
romanian\\
romansh\\
rombo\\
rundi\\
russian\\
rwa\\
sakha\\
samburu\\
samin\\
sango\\
sangu\\
sanskrit-beng\\
sanskrit-bengali\\
sanskrit-deva\\
sanskrit-devanagari\\
sanskrit-gujarati\\
sanskrit-gujr\\
sanskrit-kannada\\
sanskrit-knda\\
sanskrit-malayalam\\
sanskrit-mlym\\
sanskrit-telu\\
sanskrit-telugu\\
sanskrit\\
scottishgaelic\\
sena\\
serbian-cyrillic-bosniaherzegovina\\
serbian-cyrillic-kosovo\\
serbian-cyrillic-montenegro\\
serbian-cyrillic\\
serbian-cyrl-ba\\
serbian-cyrl-me\\
serbian-cyrl-xk\\
serbian-cyrl\\
serbian-latin-bosniaherzegovina\\
serbian-latin-kosovo\\
serbian-latin-montenegro\\
serbian-latin\\
serbian-latn-ba\\
serbian-latn-me\\
serbian-latn-xk\\
serbian-latn\\
serbian\\
shambala\\
shona\\
sichuanyi\\
sinhala\\
slovak\\
slovene\\
slovenian\\
soga\\
somali\\
spanish-mexico\\
spanish-mx\\
spanish\\
standardmoroccantamazight\\
swahili\\
swedish\\
swissgerman\\
tachelhit-latin\\
tachelhit-latn\\
tachelhit-tfng\\
tachelhit-tifinagh\\
tachelhit\\
taita\\
tamil\\
tasawaq\\
telugu\\
teso\\
thai\\
tibetan\\
tigrinya\\
tongan\\
turkish\\
turkmen\\
ukenglish\\
ukrainian\\
uppersorbian\\
urdu\\
usenglish\\
usorbian\\
uyghur\\
uzbek-arab\\
uzbek-arabic\\
uzbek-cyrillic\\
uzbek-cyrl\\
uzbek-latin\\
uzbek-latn\\
uzbek\\
vai-latin\\
vai-latn\\
vai-vai\\
vai-vaii\\
vai\\
vietnam\\
vietnamese\\
vunjo\\
walser\\
welsh\\
westernfrisian\\
yangben\\
yiddish\\
yoruba\\
zarma\\
zulu
﻿afrikaans\\

\end{multicols}
\endgroup
\hrule

\bigskip

\textbf{Modifying and adding values to |ini| files}

\New{3.39} There is a way to modify the values of |ini| files when they
get loaded with |\babelprovide| and |import|. To set, say,
|digits.native| in the |numbers| section, use something like
|numbers/digits.native=abcdefghij|. Keys may be added, too. Without
|import| you may modify the identification keys.

This can be used to create private variants easily. All you need is to
import the same |ini| file with a different locale name and different
parameters. 

% \begin{example}
%   Let's assume you need only the basic features of `spanish`, so that
%   the |ini| file is enough, and also a variant with your own
%   hyphenation with  
% \end{example}

\subsection{Selecting fonts}

\New{3.15} Babel provides a high level interface on top of |fontspec|
to select fonts. There is no need to load \textsf{fontspec} explicitly
-- \babel{} does it for you with the first |\babelfont|.\footnote{See
also the package \textsf{combofont} for a complementary approach.}

\Describe\babelfont{\oarg{language-list}\marg{font-family}%
  \oarg{font-options}\marg{font-name}}

\begin{note}
  See the note in the previous section about some issues in
  specific languages.
\end{note}

The main purpose of |\babelfont| is to define at once in a multilingual
document the fonts required by the different languages, with their
corresponding language systems (script and language). So, if you load,
say, 4 languages, |\babelfont{rm}{FreeSerif}| defines 4 fonts (with
their variants, of course), which are switched with the language by
\babel. It is a tool to make things easier and transparent to the user.

Here \textit{font-family} is |rm|, |sf| or |tt| (or newly defined
ones, as explained below), and \textit{font-name} is the same as in
\textsf{fontspec} and the like.

If no language is given, then it is considered the default font for
the family, activated when a language is selected.

On the other hand, if there is one or more languages in the optional
argument, the font will be assigned to them, overriding the default one.
Alternatively, you may set a font for a script -- just precede its name
(lowercase) with a star (eg, |*devanagari|). With this optional
argument, the font is \textit{not} yet defined, but just predeclared.
This means you may define as many fonts as you want ‘just in case’,
because if the language is never selected, the corresponding
|\babelfont| declaration is just ignored.

\Babel{} takes care of the font language and the font script when
languages are selected (as well as the writing direction); see the
recognized languages above. In most cases, you will not need
\textit{font-options}, which is the same as in \textsf{fontspec}, but
you may add further key/value pairs if necessary.

\begin{example}
  Usage in most cases is very simple. Let us assume you are setting up
  a document in Swedish, with some words in Hebrew, with a font suited
  for both languages.
  \begingroup
% If you are looking at the code to see how it has been written, you
% will be disappointed :-). The following example is built ad hoc to
% emulate the final result to avoid dependencies, and therefore it's
% not "real" code.
\setmonofont[Scale=.87,Script=Hebrew]{DejaVu Sans Mono} \catcode`@=13
\def@#1{\ifcase#1\relax \egroup \or \bgroup\textdir TLT \else
\bgroup\textdir TRT \fontspec[Scale=.87,Script=Hebrew]{Liberation
Mono} \fi}
\setengine{luatex/xetex}
\begin{verbatim}
\documentclass{article}

\usepackage[swedish, bidi=default]{babel}

\babelprovide[import]{hebrew}

_\babelfont{rm}{FreeSerif}_

\begin{document}

Svenska \foreignlanguage{hebrew}{@2עִבְרִית@0} svenska.

\end{document}
\end{verbatim}
\endgroup

If on the other hand you have to resort to different fonts, you can
replace the red line above with, say:
\setengine{luatex/xetex}
\begin{verbatim}
\babelfont{rm}{Iwona}
\babelfont[hebrew]{rm}{FreeSerif}
\end{verbatim}
\end{example}

|\babelfont| can be used to implicitly define a new font family. Just
write its name instead of |rm|, |sf| or |tt|. This is the preferred way
to select fonts in addition to the three basic families.

\begin{example}
  Here is how to do it:
\setengine{luatex/xetex}
\begin{verbatim}
\babelfont{kai}{FandolKai}
\end{verbatim}
  Now, |\kaifamily| and |\kaidefault|, as well as |\textkai| are at
  your disposal.
\end{example}

\begin{note}
  You may load \textsf{fontspec} explicitly. For example:
\setengine{luatex/xetex}
\begin{verbatim}
\usepackage{fontspec}
\newfontscript{Devanagari}{deva}
\babelfont[hindi]{rm}{Shobhika}
\end{verbatim}
  This makes sure the OpenType script for Devanagari is |deva| and not
  |dev2|, in case it is not detected correctly. You may also pass some
  options to \textsf{fontspec}: with |silent|, the warnings about
  unavailable scripts or languages are not shown (they are only really
  useful when the document format is being set up).
\end{note}

\begin{note}
  Directionality is a property affecting margins, indentation, column
  order, etc., not just text. Therefore, it is under the direct control
  of the language, which applies both the script and the direction to
  the text. As a consequence, there is no need to set \texttt{Script}
  when declaring a font with |\babelfont| (nor \texttt{Language}). In
  fact, it is even discouraged.
\end{note}

\begin{note}
  |\fontspec| is not touched at all, only the preset font families
  (|rm|, |sf|, |tt|, and the like). If a language is switched when an
  \textit{ad hoc} font is active, or you select the font with this
  command, neither the script nor the language is passed. You must
  add them by hand. This is by design, for several reasons —for
  example, each font has its own set of features and a generic setting
  for several of them can be problematic, and also preserving a
  “lower-level” font selection is useful.
\end{note}

\begin{note}
  The keys |Language| and |Script| just pass these values to the
  \textit{font}, and do \textit{not} set the script for the
  \textit{language} (and therefore the writing direction). In other
  words, the |ini| file or |\babelprovide| provides default values for
  |\babelfont| if omitted, but the opposite is not true. See the note
  above for the reasons of this behavior.
\end{note}

\begin{warning}
  Using |\set|\textit{xxxx}|font| and |\babelfont| at the same time is
  discouraged, but very often works as expected. However, be aware with
  |\set|\textit{xxxx}|font| the language system will not be set by
  \babel{} and should be set with |fontspec| if necessary.
\end{warning}

\begin{troubleshooting}
  \trouble{Package fontspec Warning: 'Language 'LANG' not available for
  font 'FONT' with script 'SCRIPT' 'Default' language used instead'}
  \textit{Package fontspec Warning: 'Language 'LANG' not available for
  font 'FONT' with script 'SCRIPT' 'Default' language used instead'}.

  \textbf{This is \textit{not} and error.} This warning is shown by
  \textsf{fontspec}, not by \babel. It can be irrelevant for English,
  but not for many other languages, including Urdu and Turkish. This is
  a useful and harmless warning, and if everything is fine with your
  document the best thing you can do is just to ignore it altogether.
\end{troubleshooting}

\begin{troubleshooting}
  \trouble{Package babel Info: The following fonts are not babel
  standard families} \textit{Package babel Info: The following fonts
  are not babel standard families}.

  \textbf{This is \textit{not} and error.} \babel{} assumes that if you
  are using |\babelfont| for a family, very likely you want to define
  the rest of them. If you don't, you can find some inconsistencies
  between families. This checking is done at the beginning of the
  document, at a point where we cannot know which families will be
  used.

  Actually, there is no real need to use |\babelfont| in a monolingual
  document, if you set the language system in |\setmainfont| (or not,
  depending on what you want).

  As the message explains, \textit{there is nothing intrinsically
  wrong} with not defining all the families. In fact, there is nothing
  intrinsically wrong with not using |\babelfont| at all. But you must
  be aware that this may lead to some problems.
\end{troubleshooting}

\subsection{Modifying a language}

Modifying the behavior of a language (say, the chapter
“caption”), is sometimes necessary, but not always trivial. In the case
of caption names a specific macro is provided, because this is perhaps
the most frequent change:

\Describe{\setlocalecaption}{%
  \marg{language-name}\marg{caption-name}\marg{string}}

\New{3.51} Here \textit{caption-name} is the name as string without the
trailing |name|. An example, which also shows caption names are often a
stylistic choice, is:
\begin{verbatim}
\setlocalecaption{english}{contents}{Table of Contents}
\end{verbatim}
This works not only with existing caption names, because it also serves to
define new ones by setting the \textit{caption-name} to the name of
your choice (|name| will be postpended). Captions so defined or
redefined behave with the ‘new way’ described in the following note.

\begin{note}
  There are a few alternative methods:
  \begin{itemize}
\item With data |import|’ed from |ini| files, you can modify the values
  of specific keys, like:
\begin{verbatim}
\babelprovide[import, _captions/listtable = Lista de tablas_]{spanish}
\end{verbatim}
  (In this particular case, instead of the |captions| group you may need
  to modify the |captions.licr| one.)

\item The ‘old way’, still valid for many languages, to redefine a
    caption is the following:
\begin{verbatim}
\addto\captionsenglish{%
  \renewcommand\contentsname{Foo}%
}
\end{verbatim}
  As of 3.15, there is no need to hide spaces with \texttt{\%%
  } (\babel{} removes them), but it is advisable to do so. This
  redefinition is not activated until the language is selected.

\item The ‘new way’, which is found in |bulgarian|, |azerbaijani|,
    |spanish|, |french|, |turkish|, |icelandic|, |vietnamese| and a few
    more, as well as in languages created with |\babelprovide| and its
    key |import|, is:
\begin{verbatim}
\renewcommand\spanishchaptername{Foo}
\end{verbatim}
This redefinition is immediate.
\end{itemize}
\end{note}

\begin{note} Do \textit{not} redefine a caption in the following way:
\begin{verbatim}
\AtBeginDocument{\renewcommand\contentsname{Foo}}
\end{verbatim}
The changes may be discarded with a language selector, and the original
value restored.
\end{note}

Macros to be run when a language is selected can be add to
  |\extras|\m{lang}:
\begin{verbatim}
\addto\extrasrussian{\mymacro}
\end{verbatim}
There is a counterpart for code to be run when a language is
unselected: |\noextras|\m{lang}.

\begin{note}
  These macros (|\captions|\m{lang}, |\extras|\m{lang}) may be
  redefined, but \textit{must not} be used as such -- they just pass
  information to \babel{}, which executes them in the proper context.
\end{note}

Another way to modify a language loaded as a package or class option
is by means of |\babelprovide|, described below in depth. So,
something like:
\begin{verbatim}
\usepackage[danish]{babel}
\babelprovide[captions=da, hyphenrules=nohyphenation]{danish}
\end{verbatim}
first loads |danish.ldf|, and then redefines the captions for
\texttt{danish} (as provided by the |ini| file) and prevents
hyphenation. The rest of the language definitions are not touched.
Without the optional argument it just loads some aditional tools if
provided by the |ini| file, like extra counters.

\subsection{Creating a language}

\New{3.10} And what if there is no style for your language or none fits
your needs? You may then define quickly a language with the help of the
following macro in the preamble (which may be used to modify an
existing language, too, as explained in the previous subsection).

\Describe{\babelprovide}{\oarg{options}\marg{language-name}}

If the language \m{language-name} has not been loaded as class or
package option and there are no \m{options}, it creates an “empty” one
with some defaults in its internal structure: the hyphen rules, if not
available, are set to the current ones, left and right hyphen mins are
set to 2 and 3. In either case, caption, date and language system are
not defined.

If no |ini| file is imported with |import|, \m{language-name} is still
relevant because in such a case the hyphenation and like breaking rules
(including those for South East Asian and CJK) are based on it as
provided in the |ini| file corresponding to that name; the same applies
to OpenType language and script.

Conveniently, some options allow to fill the language, and \babel{}
warns you about what to do if there is a missing string. Very likely
you will find alerts like that in the |log| file:
\begin{verbatim}
Package babel Warning: \chaptername not set for 'mylang'. Please,
(babel)                define it after the language has been loaded
(babel)                (typically in the preamble) with:
(babel)                \setlocalecaption{mylang}{chapter}{..}
(babel)                Reported on input line 26.
\end{verbatim}

In most cases, you will only need to define a few macros. Note
languages loaded on the fly are not yet available in the preamble. 

\begin{example}
  If you need a language named |arhinish|:
\begin{verbatim}
\usepackage[danish]{babel}
\babelprovide{arhinish}
\setlocalecaption{arhinish}{chapter}{Chapitula}
\setlocalecaption{arhinish}{refname}{Refirenke}
\renewcommand\arhinishhyphenmins{22}
\end{verbatim}
\end{example}

\begin{example}
  Locales with names based on BCP 47 codes can be created with
  something like:
\begin{verbatim}
  \babelprovide[import=en-US]{enUS}
\end{verbatim}
  Note, however, mixing ways to identify locales can lead to problems.
  For example, is \verb|yi| the name of the language spoken by the Yi
  people or is it the code for Yiddish?
\end{example}

The main language is not changed (\texttt{danish} in this example).
So, you must add |\selectlanguage{arhinish}| or other selectors where
necessary.

If the language has been loaded as an argument in |\documentclass| or
|\usepackage|, then |\babelprovide| redefines the requested data.

\Describe{import=}{\meta{language-tag}}
\New{3.13} Imports data from an |ini| file, including captions and date
(also line breaking rules in newly defined languages). For example:
\begin{verbatim}
\babelprovide[_import=hu_]{hungarian}
\end{verbatim}
Unicode engines load the UTF-8 variants, while 8-bit engines load the
LICR (ie, with macros like |\'| or |\ss|) ones.

\New{3.23} It may be used without a value. In such a case, the |ini|
file set in the corresponding |babel-<language>.tex| (where
|<language>| is the last argument in |\babelprovide|) is imported. See
the list of recognized languages above. So, the previous example can 
be written:
\begin{verbatim}
\babelprovide[_import_]{hungarian}
\end{verbatim}

There are about 250 |ini| files, with data taken from the |ldf| files
and the CLDR provided by Unicode. Not all languages in the latter are
complete, and therefore neither are the |ini| files. A few languages
may show a warning about the current lack of suitability of some
features.

Besides |\today|, this option defines an additional command for dates:
|\<language>date|, which takes three arguments, namely, year, month and
day numbers. In fact, |\today| calls |\<language>today|, which in turn
calls |\<language>date{\the\year}{\the\month}{\the\day}|. \New{3.44}
More convenient is usually |\localedate|, with prints the date for the
current locale.

\Describe{captions=}{\meta{language-tag}}
Loads only the strings. For example:
\begin{verbatim}
\babelprovide[_captions=hu_]{hungarian}
\end{verbatim}

\Describe{hyphenrules=}{\meta{language-list}} With this option, with a
space-separated list of hyphenation rules, \babel{} assigns to the
language the first valid hyphenation rules in the list. For example:
\begin{verbatim}
\babelprovide[_hyphenrules=chavacano spanish italian_]{chavacano}
\end{verbatim}
If none of the listed hyphenrules exist, the default behavior
applies. Note in this example we set |chavacano| as first option --
without it, it would select |spanish| even if |chavacano| exists.

A special value is |+|, which allocates a new language (in the \TeX{}
sense). It only makes sense as the last value (or the only one; the
subsequent ones are silently ignored). It is mostly useful with
\luatex, because you can add some patterns with |\babelpatterns|, as
for example:
\begin{verbatim}
\babelprovide[hyphenrules=+]{neo}
\babelpatterns[neo]{a1 e1 i1 o1 u1}
\end{verbatim}
In other engines it just suppresses hyphenation (because the pattern
list is empty).

\New{3.58} Another special value is |unhyphenated|, which activates a
line breking mode that allows spaces to be stretched to arbitrary amounts.

\Describe{main}{} This valueless option makes the language the main one
(thus overriding that set when \babel\ is loaded). Only in newly defined
languages.
\begin{example}
  Let's assume your document is mainly in Polytonic Greek, but with some
  sections in Italian. Then, the first attempt should be:
\begin{verbatim}
\usepackage[italian, greek.polutonic]{babel}
\end{verbatim}
  But if, say, accents in Greek are not shown correctly, you can try: 
\begin{verbatim}
\usepackage[italian]{babel}
\babelprovide[import, main]{polytonicgreek}
\end{verbatim}
Remerber there is an alternative syntax for the latter:
\begin{verbatim}
\usepackage[italian, polytonicgreek, provide=*]{babel}
\end{verbatim}
\end{example}

\Describe{script=}{\meta{script-name}}
\New{3.15} Sets the script name to be used by \textsf{fontspec} (eg,
|Devanagari|). Overrides the value in the |ini| file. If
\textsf{fontspec} does not define it, then \babel{} sets its tag to
that provided by the |ini| file. This value is particularly important
because it sets the writing direction, so you must use it if for some
reason the default value is wrong.

\Describe{language=}{\meta{language-name}} \New{3.15}
Sets the language name to be used by \textsf{fontspec} (eg, |Hindi|).
Overrides the value in the |ini| file. If \textsf{fontspec} does not
define it, then \babel{} sets its tag to that provided by the |ini|
file. Not so important, but sometimes still relevant.

\Describe{alph=}{\meta{counter-name}} Assigns to |\alph| that counter.
See the next section.

\Describe{Alph=}{\meta{counter-name}} Same for |\Alph|.

\bigskip

A few options (only \luatex) set some properties of the writing system
used by the language. These properties are \textit{always} applied to
the script, no matter which language is active. Although somewhat
inconsistent, this makes setting a language up easier in most typical
cases.

\Describe{onchar=}{\texttt{ids} $\string|$ \texttt{fonts}}
\New{3.38} This option is much like an ‘event’ called when a character
belonging to the script of this locale is found (as its name implies,
it acts on characters, not on spaces). There are currently two
‘actions’, which can be used at the same time (separated by a space):
with |ids| the |\language| and the |\localeid| are set to the values of
this locale; with |fonts|, the fonts are changed to those of this
locale (as set with |\babelfont|). This option is not compatible with
|mapfont|. Characters can be added or modified with
|\babelcharproperty|.

\begin{note}
  An alternative approach with \luatex{} and Harfbuzz is the font
  option |RawFeature={multiscript=auto}|. It does not switch the
  \babel{} language and therefore the line breaking rules, but in many
  cases it can be enough.
\end{note}

\Describe{intraspace=}{\meta{base} \meta{shrink} \meta{stretch}}
Sets the interword space for the writing system of the language, in em
units (so, |0 .1 0| is |0em plus .1em|). Like |\spaceskip|, the em unit
applied is that of the current text (more precisely, the previous 
glyph). Currently used only in Southeast Asian scrips, like Thai, and
CJK.

\Describe{intrapenalty=}{\meta{penalty}}
Sets the interword penalty for the writing system of this language.
Currently used only in Southeast Asian scrips, like Thai. Ignored if 0
(which is the default value). 

\Describe{justification=}{\texttt{kashida} $\string|$
\texttt{elongated} $\string|$ \texttt{unhyphenated}}
\New{3.59} There are currently three options, mainly for the Arabic
script. It sets the linebreaking and justification method, which can be
based on the the \textsc{arabic tatweel} character or in the
‘justification alternatives’ OpenType table (\texttt{jalt}). For an
explanation see the
\href{https://latex3.github.io/babel/news/whats-new-in-babel-3.59.html}%
  {\babel\ site}.

\Describe{linebreaking=}{}
\New{3.59} Just a synonymous for \texttt{justification}.

\Describe{mapfont=}{\texttt{direction}}
Assigns the font for the writing direction of this language (only with
|bidi=basic|). Whenever possible, instead of this option use |onchar|,
based on the script, which usually makes more sense. More precisely,
what |mapfont=direction| means is, ‘when a character has the same
direction as the script for the “provided” language, then change its
font to that set for this language’. There are 3 directions, following
the bidi Unicode algorithm, namely, Arabic-like, Hebrew-like and left
to right. So, there should be at most 3 directives of this kind.

\begin{note}
  (1) If you need shorthands, you can define them with |\useshorthands|
  and |\defineshorthand| as described above. (2) Captions and |\today|
  are ``ensured'' with |\babelensure| (this is the default in
  |ini|-based languages).
\end{note}

\subsection{Digits and counters}

\New{3.20} About thirty |ini| files define a field named
|digits.native|. When it is present, two macros are created:
|\<language>digits| and |\<language>counter| (only \xetex{} and
\luatex{}). With the first, a string of ‘Latin’ digits are converted to
the native digits of that language; the second takes a counter name as
argument. With the option |maparabic| in |\babelprovide|, |\arabic| is
redefined to produce the native digits (this is done \textit{globally},
to avoid inconsistencies in, for example, page numbering, and note as
well dates do not rely on |\arabic|.)

For example:
\begin{verbatim}
\babelprovide[import]{telugu}  % Telugu better with XeTeX
  % Or also, if you want:
  % \babelprovide[import, maparabic]{telugu}
\babelfont{rm}{Gautami}
\begin{document}
_\telugudigits{1234}_
_\telugucounter{section}_
\end{document}
\end{verbatim}

Languages providing native digits in all or some variants are:
\begin{multicols}{5}
Arabic\\
Assamese\\
Bangla\\
Tibetar\\
Bodo\\
Central Kurdish\\
Dzongkha\\
Persian\\
Gujarati\\
Hindi\\
Khmer\\
Kannada\\
Konkani\\
Kashmiri\\
Lao\\
Northern Luri\\
Malayalam\\
Marathi\\
Burmese\\
Mazanderani\\
Nepali\\
Odia\\
Punjabi\\
Pashto\\
Tamil\\
Telugu\\
Thai\\
Uyghur\\
Urdu\\
Uzbek\\
Vai\\
Cantonese\\
Chinese
\end{multicols}

\New{3.30} With \luatex{} there is an alternative approach for mapping
digits, namely, |mapdigits|. Conversion is based on the language and it
is applied to the typeset text (not math, PDF bookmarks, etc.) before
bidi and fonts are processed (ie, to the node list as generated by the
\TeX{} code). This means the local digits have the correct
bidirectional behavior (unlike |Numbers=Arabic| in \textsf{fontspec},
which is not recommended).

\begin{note}
  With \xetex{} you can use the option |Mapping| when defining a
  font.
\end{note}

\New{4.41} Many `ini` locale files has been extended with information
about non-positional numerical systems, based on those predefined in
CSS. They only work with \xetex{} and \luatex{} and are fully
expendable (even inside an unprotected |\edef|). Currently, they are
limited to numbers below 10000.

There are several ways to use them (for the availabe styles in each
language, see the list below):

\begin{itemize}
\item |\localenumeral|\marg{style}\marg{number}, like
  |\localenumeral{abjad}{15}|
\item |\localecounter|\marg{style}\marg{counter}, like
  |\localecounter{lower}{section}|
\item In |\babelprovide|, as an argument to the keys |alph| and |Alph|,
which redefine what |\alph| and |\Alph| print. For example:
\begin{verbatim}
\babelprovide[alph=alphabetic]{thai}
\end{verbatim}
\end{itemize}

The styles are:
\begin{description}
\itemsep=-\parskip
\item[Ancient Greek] |lower.ancient|, |upper.ancient|

\item[Amharic] |afar|, |agaw|, |ari|, |blin|, |dizi|, |gedeo|, |gumuz|,
|hadiyya|, |harari|, |kaffa|, |kebena|, |kembata|, |konso|, |kunama|,
|meen|, |oromo|, |saho|, |sidama|, |silti|, |tigre|, |wolaita|, |yemsa|

\item[Arabic] |abjad|, |maghrebi.abjad|

\item[Belarusan, Bulgarian, Macedonian, Serbian] |lower|, |upper| 

\item[Bengali] |alphabetic|

\item[Coptic] |epact|,|lower.letters|

\item[Hebrew] |letters| (neither geresh nor gershayim yet)

\item[Hindi] |alphabetic|

\item[Armenian] |lower.letter|, |upper.letter|

\item[Japanese] |hiragana|, |hiragana.iroha|, |katakana|,
|katakana.iroha|, |circled.katakana|, |informal|, |formal|,
|cjk-earthly-branch|, |cjk-heavenly-stem|, f|ullwidth.lower.alpha|,
|fullwidth.upper.alpha|

\item[Georgian] |letters|

\item[Greek] |lower.modern|, |upper.modern|, |lower.ancient|,
|upper.ancient| (all with keraia)

\item[Khmer] |consonant|

\item[Korean] |consonant|, |syllabe|, |hanja.informal|,
|hanja.formal|, |hangul.formal|, |cjk-earthly-branch|,
|cjk-heavenly-stem|, |fullwidth.lower.alpha|, |fullwidth.upper.alpha|

\item[Marathi] |alphabetic|

\item[Persian] |abjad|, |alphabetic| 

\item[Russian] |lower|, |lower.full|, |upper|, |upper.full|

\item[Syriac] |letters|

\item[Tamil] |ancient|

\item[Thai] |alphabetic|

\item[Ukrainian] |lower| , |lower.full|, |upper| , |upper.full|

\item[Chinese] |cjk-earthly-branch|, |cjk-heavenly-stem|,
|fullwidth.lower.alpha|, |fullwidth.upper.alpha|
\end{description}

\New{3.45} In addition, native digits (in languages defining them) may
be printed with the numeral style |digits|.

\subsection{Dates}

\New{3.45} When the data is taken from an |ìni| file, you may print the
date corresponding to the Gregorian calendar and other lunisolar systems
with the following command.

\Describe{\localedate}{\oarg{calendar=.., variant=..}%
  {\marg{year}\m{month}\m{day}}}

By default the calendar is the Gregorian, but a |ini| files may define
strings for other calendars (currently |ar|, |ar-|*, |he|, |fa|, |hi|.)
In the latter case, the three arguments are the year, the month, and
the day in those in the corresponding calendar. They are \textit{not}
the Gregorian data to be converted (which means, say, 13 is a valid
month number with |calendar=hebrew|).

Even with a certain calendar there may be variants. In Kurmanji the
default variant prints something like \textit{30. Çileya Pêşîn 2019},
but with |variant=izafa| it prints \textit{31’ê Çileya Pêşînê 2019}.

\subsection{Accessing language info}

\Describe{\languagename}{}
The control sequence |\languagename| contains the name of the
current language.

\begin{warning}
  Due to some internal inconsistencies in catcodes, it should
  \textit{not} be used to test its value. Use \textsf{iflang}, by
  Heiko Oberdiek.
\end{warning}

\Describe{\iflanguage}{\marg{language}\marg{true}\marg{false}}

If more than one language is used, it might be necessary to know which
language is active at a specific time. This can be checked by a call
to |\iflanguage|, but note here ``language'' is used in the \TeX
sense, as a set of hyphenation patterns, and \textit{not} as its
\textsf{babel} name. This macro takes three arguments.  The first
argument is the name of a language; the second and third arguments are
the actions to take if the result of the test is true or false
respectively.

\Describe{\localeinfo}{\marg{field}}

\New{3.38} If an |ini| file has been loaded for the current language,
you may access the information stored in it. This macro is fully
expandable, and the available fields are:
\begin{description}
\itemsep=-\parskip
\item[|name.english|] as provided by the Unicode CLDR.
%%% \item[|name.locale|] is the equivalent of |\languagename|. Not yet
%%% activated because the bug in \languagename is far from trivial.
\item[|tag.ini|] is the tag of the |ini| file (the way this
  file is identified in its name).
\item[|tag.bcp47|] is the full BCP 47 tag (see the warning below).
\item[|language.tag.bcp47|] is the BCP 47 language tag.
\item[|tag.opentype|] is the tag used by OpenType (usually, but not
  always, the same as BCP 47).
\item[|script.name|], as provided by the Unicode CLDR.
\item[|script.tag.bcp47|] is the BCP 47 tag of the script
  used by this locale.
\item[|script.tag.opentype|] is the tag used by OpenType (usually,
  but not always, the same as BCP 47).
\end{description}

\begin{warning}
  \New{3.46} As of version 3.46 |tag.bcp47| returns the full BCP 47
  tag. Formerly it returned just the language subtag, which was clearly
  counterintuitive.
\end{warning}

\Describe{\getlocaleproperty}{%
  \colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}%
  \marg{macro}\marg{locale}\marg{property}}

\New{3.42} The value of any locale property as set by the |ini| files
(or added/modified with |\babelprovide|) can be retrieved and stored in
a macro with this command. For example, after:
\begin{verbatim}
  \getlocaleproperty\hechap{hebrew}{captions/chapter}
\end{verbatim}
the macro |\hechap| will contain the string
{\fontspec[Scale=.87,Script=Hebrew]{Liberation Mono}\textdir TRT פרק}.

If the key does not exist, the macro is set to |\relax| and an error is
raised. \New{3.47} With the starred version no error is raised, so that
you can take your own actions with undefined properties.

\Babel{} remembers which |ini| files have been loaded. There is a loop
named |\LocaleForEach| to traverse the list, where |#1| is the name of
the current item, so that |\LocaleForEach{\message{ **#1** }}| just
shows the loaded |ini|’s. 

\begin{note}
|ini| files are loaded with |\babelprovide| and also when languages are
selected if there is a |\babelfont|. To ensure the |ini| files are
loaded (and therefore the corresponding data) even if these two
conditions are not met, write |\BabelEnsureInfo| in the preamble.
\end{note}

\Describe{\localeid}{}

Each language in the \babel{} sense has its own unique numeric
identifier, which can be retrieved with |\localeid|.

\begin{note}
  The |\localeid| is not the same as the |\language| identifier, which
  refers to a set of hyphenation patters (which, in turn, is just a
  component of the line breaking algorithm described in the next
  section). The data about preloaded patterns are store in an internal
  macro named |\bbl@languages| (see the code for further details), but
  note several locales may share a single |\language|, so they are
  separated concepts. In \luatex, the |\localeid| is saved in each node
  (where it makes sense) as an attribute, too.
\end{note}

\subsection{Hyphenation and line breaking}

\Babel{} deals with three kinds of line breaking rules: Western,
typically the LGC group, South East Asian, like Thai, and CJK, but
support depends on the engine: \textsf{pdftex} only deals with the
former, \xetex{} also with the second one (although in a limited way),
while \luatex{} provides basic rules for the latter, too.

\Describe{\babelhyphen}{%
  \colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}\marg{type}}
\DescribeOther\babelhyphen{%
  \colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}\marg{text}}

\New{3.9a} It is customary to classify hyphens in two types: (1)
\textit{explicit} or \textit{hard hyphens}, which in \TeX\ are
entered as \verb|-|, and (2) \textit{optional} or \textit{soft
hyphens}, which are entered as \verb|\-|. Strictly, a \textit{soft
hyphen} is not a hyphen, but just a breaking opportunity or, in
\TeX\ terms, a ``discretionary''; a \textit{hard hyphen} is a hyphen
with a breaking opportunity after it. A further type is a
\textit{non-breaking hyphen}, a hyphen without a breaking
opportunity.

In \TeX, \verb|-| and \verb|\-| forbid further breaking opportunities
in the word. This is the desired behavior very often, but not always,
and therefore many languages provide shorthands for these
cases. Unfortunately, this has not been done consistently: for
example, \verb|"-| in Dutch, Portuguese, Catalan or Danish is a hard
hyphen, while in German, Spanish, Norwegian, Slovak or Russian is a
soft hyphen. Furthermore, some of them even redefine |\-|, so that you
cannot insert a soft hyphen without breaking opportunities in the rest
of the word.

Therefore, some macros are provided with a set of basic ``hyphens''
which can be used by themselves, to define a user shorthand, or even
in language files.
\begin{itemize}
\item |\babelhyphen{soft}| and |\babelhyphen{hard}| are self
  explanatory.
\item |\babelhyphen{repeat}| inserts a hard hyphen which is repeated
  at the beginning of the next line, as done in languages like
  Polish, Portuguese and Spanish.
\item |\babelhyphen{nobreak}| inserts a hard hyphen without a break
  after it (even if a space follows).
\item |\babelhyphen{empty}| inserts a break opportunity without
  a hyphen at all.
\item |\babelhyphen|\marg{text} is a hard ``hyphen'' using \m{text}
  instead. A typical case is |\babelhyphen{/}|.
\end{itemize}
With all of them, hyphenation in the rest of the word is enabled. If
you don't want to enable it, there is a starred counterpart:
|\babelhyphen*{soft}| (which in most cases is equivalent to the
original |\-|), |\babelhyphen*{hard}|, etc.

Note |hard| is also good for isolated prefixes (eg, \textit{anti-})
and |nobreak| for isolated suffixes (eg, \textit{-ism}), but in both
cases |\babelhyphen*{nobreak}| is usually better.

There are also some differences with \LaTeX: (1) the character used is
that set for the current font, while in \LaTeX{} it is hardwired to
|-| (a typical value); (2) the hyphen to be used in fonts with a
negative |\hyphenchar| is  |-|, like in \LaTeX, but it can be changed to
another value by redefining |\babelnullhyphen|; (3) a break after the
hyphen is forbidden if preceded by a glue ${>}0$~pt (at the beginning
of a word, provided it is not immediately preceded by, say, a
parenthesis).

\Describe\babelhyphenation{\texttt{[}\langlist\texttt{]}%
    \marg{exceptions}}

\New{3.9a} Sets hyphenation exceptions for the languages given
or, without the optional argument, for \textit{all} languages (eg,
proper nouns or common loan words, and of course monolingual
documents). Language exceptions take precedence over global ones.

It can be used only in the preamble, and exceptions are set when the
language is first selected, thus taking into account changes of
|\lccodes|'s done in |\extras|\m{lang} as well as the language-specific
encoding (not set in the preamble by default). Multiple
|\babelhyphenation|'s are allowed. For example:
\begin{verbatim}
\babelhyphenation{Wal-hal-la Dar-bhan-ga}
\end{verbatim}

Listed words are saved expanded and therefore it relies on the
LICR. Of course, it also works without the LICR if the input and the
font encodings are the same, like in Unicode based engines.

\begin{note}
  Using |\babelhyphenation| with Southeast Asian scripts is mostly
  pointless. But with |\babelpatterns| (below) you may fine-tune line
  breaking (only \luatex). Even if there are no patterns for the
  language, you can add at least some typical cases.
\end{note}

\begin{note}
  To set hyphenation exceptions in the preamble before any language is
  explicitly set with a selector, use |\babelhyphenation| instead of
  |\hyphenation|. In the preamble the hyphenation rules are not always
  fully set up and an error can be raised.
\end{note}

\Describe{\begin\menv{hyphenrules}}{\marg{language}\Eenv{hyphenrules}}

The environment \Lenv{hyphenrules} can be used to select \emph{only} the
hyphenation rules to be used (it can be used as command, too). This can
for instance be used to select `nohyphenation', provided that in
\file{language.dat} the `language' \textsf{nohyphenation} is defined by
loading \file{zerohyph.tex}. It deactivates language shorthands, too
(but not user shorthands).

Except for these simple uses, |hyphenrules| is deprecated and
|otherlanguage*| (the starred version) is preferred, because the former
does not take into account possible changes in encodings of characters
like, say, |'| done by some languages (eg, \textsf{italian},
\textsf{french}, \textsf{ukraineb}).

\Describe{\babelpatterns}{\texttt{[}\langlist\texttt{]}%
    \marg{patterns}}

\New{3.9m} \textit{In \textsf{luatex} only},\footnote{With
\textsf{luatex} exceptions and patterns can be modified almost
freely. However, this is very likely a task for a separate package
and \texttt{babel} only provides the most basic tools.} adds or
replaces patterns for the languages given or, without the optional
argument, for \textit{all} languages. If a pattern for a certain
combination already exists, it gets replaced by the new one.

It can be used only in the preamble, and patterns are added when the
language is first selected, thus taking into account changes of
|\lccodes|'s done in |\extras|\m{lang} as well as the language-specific
encoding (not set in the preamble by default). Multiple
|\babelpatterns|'s are allowed.

Listed patterns are saved expanded and therefore it relies on the
LICR. Of course, it also works without the LICR if the input and the
font encodings are the same, like in Unicode based engines.

\New{3.31} (Only \luatex.) With |\babelprovide| and |import|ed CJK
languages, a simple generic line breaking algorithm (push-out-first) is
applied, based on a selection of the Unicode rules (\New{3.32} it is
disabled in verbatim mode, or more precisely when the hyphenrules
are set to |nohyphenation|). It can be activated alternatively by
setting explicitly the |intraspace|.

\New{3.27} Interword spacing for Thai, Lao and Khemer is activated
automatically if a language with one of those scripts are loaded with
|\babelprovide|. See the sample on the \babel{} repository. With both
Unicode engines, spacing is based on the ``current'' em unit (the size
of the previous char in \luatex, and the font size set by the last
|\selectfont| in \xetex).

\subsection{Transforms}

Transforms (only \luatex) provide a way to process the text on the
typesetting level in several language-dependent ways, like non-standard
hyphenation, special line breaking rules, script to script conversion,
spacing conventions and so on.\footnote{They are similar in concept,
but not the same, as those in Unicode.}

It currently embraces |\babelprehyphenation| and
|\babelposthyphenation|.

\New{3.57} Several \textsf{ini} files predefine some transforms. They
are activated with the key |transforms| in |\babelprovide|, either if
the locale is being defined with this macro or the languages has been
previouly loaded as a class or package option, as the following example
illustrates:
\begin{verbatim}
  \usepackage[magyar]{babel}
  \babelprovide[_transforms = digraphs.hyphen_]{magyar}
\end{verbatim}

Here are the transforms currently predefined. (More to follow 
in future releases.)

\begingroup
\def\trans#1#2#3{%
  \vspace{1.5mm}%
  \parbox[t]{2.2cm}{\raggedright\strut#1}%
  \hspace{2mm}%
  \parbox[t]{4.0cm}{\strut\ttfamily#2}%
  \hspace{2mm}%
  \parbox[t]{6.6cm}{\strut#3}\par}
\bigskip\hrule\nobreak\vspace{.5mm}
% \strut\hfil Transforms 
% \medskip\hrule\nobreak

\trans{Arabic}{transliteration.dad}{Applies the transliteration system
devised by Yannis Haralambous for \textsf{dad} (simple and
\TeX-friendly). Not yet complete, but sufficient for most texts.}

\trans{Croatian}{digraphs.ligatures}{Ligatures \textit{DŽ}, \textit{Dž},
\textit{dž}, \textit{LJ}, \textit{Lj}, \textit{lj}, \textit{NJ},
\textit{Nj}, \textit{nj}. It assumes they exist. This is not the
recommended way to make these transformations (the best way is with
OTF features), but it can get you out of a hurry.}

\trans{Czech, Polish, Portuguese, Slovak,
Spanish}{hyphen.repeat}{Explicit hyphens behave like
|\string\babelhyphen|\allowbreak|\{repeat\}|.}

\trans{Czech, Polish, Slovak}{oneletter.nobreak}{Converts a space after
a non-syllabic preposition or conjunction into a non-breaking space.}

\trans{Greek}{diaeresis.hyphen}{Removes the diaeresis above iota and
upsilon if hyphenated just before. It works with the three variants.}

\trans{Hindi, Sanskrit}{transliteration.hk}{The Harvard-Kyoto system to
romanize Devanagari.}

\trans{Hindi, Sanskrit}{punctuation.space}{Inserts a space before the following
four characters: \textit{!?:;}\,.}

\trans{Hungarian}{digraphs.hyphen}{Hyphenates the long digraphs
\textit{ccs}, \textit{ddz}, \textit{ggy}, \textit{lly}, \textit{nny},
\textit{ssz}, \textit{tty} and \textit{zzs} as \textit{cs-cs},
\textit{dz-dz}, etc.}

\trans{Indic scripts}{danda.nobreak}{Prevents a line break before a
danda or double danda if there is a space. For Assamese, Bengali,
Gujarati, Hindi, Kannada, Malayalam, Marathi, Oriya, Tamil, Telugu.}

\trans{Arabic, Persian}{kashida.plain}{Experimental. A very simple and
basic transform for ‘plain’ Arabic fonts, which attempts to distribute
the tatwil as evenly as possible (starting at the end of the line). See
the news for version 3.59.}

\trans{Serbian}{transliteration.gajica}{(Note |serbian| with |ini|
files refers to the Cyrillic script, which is here the target.) The
standard system devised by Ljudevit Gaj.}

\vspace{2mm}\hrule\nobreak
\endgroup

\Describe{\babelposthyphenation}{\marg{hyphenrules-name}%
          \marg{lua-pattern}\marg{replacement}}

\New{3.37-3.39} \textit{With \luatex{}} it is now possible to define
non-standard hyphenation rules, like |f-f| $\to$ |ff-f|, repeated
hyphens, ranked ruled (or more precisely, ‘penalized’ hyphenation
points), and so on. Only a few rules are currently provided (see
below), but they can be defined as shown in the following example,
where |{1}| is the first captured char (between |()| in the pattern):
\begin{verbatim}
\babelposthyphenation{german}{([fmtrp]) | {1}}
{
  { no = {1}, pre = {1}{1}- }, % Replace first char with disc
  remove,                      % Remove automatic disc (2nd node)
  {}                           % Keep last char, untouched
}
\end{verbatim}

In the replacements, a captured char may be mapped to another, too. For
example, if the first capture reads |([ΐΰ])|, the replacement could be
\verb+{1|ΐΰ|ίύ}+, which maps \textit{ΐ} to \textit{ί}, and \textit{ΰ}
to \textit{ύ}, so that the diaeresis is removed.

This feature is activated with the first |\babelposthyphenation| or
|\babelprehyphenation|.

See the
\href{https://latex3.github.io/babel/guides/%
  non-standard-hyphenation-with-luatex.html}{\babel\ site} for a more
detailed description and some examples. It also describes a few
additional replacement types (|string|, |penalty|).

Although the main purpose of this command is non-standard hyphenation,
it may actually be used for other transformations (after hyphenation is
applied, so you must take discretionaries into account).

You are limited to substitutions as done by \textsf{lua}, although a
future implementation may alternatively accept \textsf{lpeg}.

\Describe{\babelprehyphenation}{\marg{locale-name}%
          \marg{lua-pattern}\marg{replacement}}

\New{3.44-3-52} It is similar to the latter, but (as its name implies)
applied before hyphenation, which is particularly useful in
transliterations. There are other differences: (1) the first argument
is the locale instead of the name of the hyphenation patterns; (2) in the
search patterns |=| has no special meaning, while \verb+|+ stands for
an ordinary space; (3) in the replacement, discretionaries are not
accepted. 

This feature is activated with the first |\babelposthyphenation| or
|\babelprehyphenation|.

\begin{example}
  You can replace a character (or series of them) by another character
  (or series of them). Thus, to enter \textit{ž} as |zh| and \textit{š}
  as |sh| in a newly created locale for transliterated Russian:
\begin{verbatim}
\babelprovide[hyphenrules=+]{russian-latin}   % Create locale
\babelprehyphenation{russian-latin}{([sz])h}  % Create rule
{
  string = {1|sz|šž},
  remove
}
\end{verbatim}
\end{example}

\begin{example}
  The following rule prevent the word “a” from being at the
  end of a line:
\begin{verbatim}
\babelprehyphenation{english}{|a|}
  {}, {},                       % Keep first space and a
  { insert, penalty = 10000 },  % Insert penalty
  {}                            % Keep last space
}
\end{verbatim}
\end{example}

\begin{note}
  With \luatex{} there is another approach to make text
  transformations, with the function |fonts.handlers.otf.addfeature|,
  which adds new features to an OTF font (substitution and
  positioning). These features can be made language-dependent, and
  \babel{} by default recognizes this setting if the font has been
  declared with |\babelfont|. The \textit{transforms} mechanism
  supplements rather than replaces OTF features.

  With \xetex{}, where \textit{transforms} are not available, there is
  still another approach, with font mappings, mainly meant to perform
  encoding conversions and transliterations. Mappings, however, are
  linked to fonts, not to languages.
\end{note}

\subsection{Selection based on BCP 47 tags}
\label{bcp47}

\New{3.43} The recommended way to select languages is that described at
the beginning of this document. However, BCP 47 tags are becoming
customary, particularly in documents (or parts of documents) generated
by external sources, and therefore \babel{} will provide a set of tools
to select the locales in different situations, adapted to the
particular needs of each case. Currently, \babel{} provides autoloading
of locales as described in this section. In these contexts autoloading
is particularly important because we may not know on beforehand which
languages will be requested.

It must be activated explicitly, because it is primarily meant for
special tasks. Mapping from BCP 47 codes to locale names are not
hardcoded in \babel. Instead the data is taken from the \texttt{ini}
files, which means currently about 250 tags are already recognized.
\Babel{} performs a simple lookup in the following way: |fr-Latn-FR| $\to$
|fr-Latn| $\to$ |fr-FR| $\to$ |fr|. Languages with the same resolved
name are considered the same. Case is normalized before, so that
|fr-latn-fr| $\to$ |fr-Latn-FR|. If a tag and a name overlap, the tag
takes precedence.

Here is a minimal example:
\begin{verbatim}
\documentclass{article}

\usepackage[danish]{babel}

_\babeladjust{_
_  autoload.bcp47 = on,_
_  autoload.bcp47.options = import_
_}_

\begin{document}

Chapter in Danish: \chaptername.

_\selectlanguage{de-AT}_

\localedate{2020}{1}{30}

\end{document}
\end{verbatim}

Currently the locales loaded are based on the \texttt{ini} files and
decoupled from the main \texttt{ldf} files. This is by design, to
ensure code generated externally produces the same result regardless of
the languages requested in the document, but an option to use the
\texttt{ldf} instead will be added in a future release, because both
options make sense depending on the particular needs of each document
(there will be some restrictions, however).

The behaviour is adjusted with |\babeladjust| with the following parameters:
\begin{description}
\item \texttt{autoload.bcp47} with values |on| and |off|.
\item \texttt{autoload.bcp47.options}, which are passed to
  |\babelprovide|; empty by default, but you may add \texttt{import}
  (features defined in the corresponding |babel-...tex| file might not
  be available).
\item \texttt{autoload.bcp47.prefix}. Although the public name used in
  selectors is the tag, the internal name will be different and
  generated by prepending a prefix, which by default is
  \texttt{bcp47-}. You may change it with this key.
\end{description}

\New{3.46} If an |ldf| file has been loaded, you can enable the
corresponding language tags as selector names with:
\begin{verbatim}
\babeladjust{ bcp47.toname = on }
\end{verbatim}
(You can deactivate it with |off|.) So, if |dutch| is one of the
package (or class) options, you can write |\selectlanguage{nl}|. Note
the language name does not change (in this example is still |dutch|),
but you can get it with |\localeinfo| or |\getlanguageproperty|. It
must be turned on explicitly for similar reasons to those explained
above.

\subsection{Selecting scripts}

Currently \babel{} provides no standard interface to select
scripts, because they are best selected with either |\fontencoding|
(low-level) or a language name (high-level). Even the Latin script may
require different encodings (ie, sets of glyphs) depending on the
language, and therefore such a switch would be in a sense
incomplete.\footnote{The so-called Unicode fonts do not improve the
situation either. So, a font suited for Vietnamese is not necessarily
suited for, say, the romanization of Indic languages, and the fact it
contains glyphs for Modern Greek does not mean it includes them for
Classic Greek.}

Some languages sharing the same script define macros to switch it (eg,
|\textcyrillic|), but be aware they may also set the language to a
certain default. Even the \babel{} core defined |\textlatin|, but is
was somewhat buggy because in some cases it messed up encodings and
fonts (for example, if the main Latin encoding was |LY1|), and
therefore it has been deprecated.\footnote{But still defined for
backwards compatibility.}

\Describe{\ensureascii}{\marg{text}}

\New{3.9i} This macro makes sure \m{text} is typeset with a
LICR-savvy encoding in the ASCII range. It is used to redefine |\TeX|
and |\LaTeX| so that they are correctly typeset even with |LGR| or
|X2| (the complete list is stored in |\BabelNonASCII|, which by default
is |LGR|, |X2|, |OT2|, |OT3|, |OT6|, |LHE|, |LWN|, |LMA|, |LMC|,
|LMS|, |LMU|, but you can modify it). So, in some sense it fixes the
bug described in the previous paragraph.

If non-ASCII encodings are not loaded (or no encoding at all), it is
no-op (also |\TeX| and |\LaTeX| are not redefined); otherwise,
|\ensureascii| switches to the encoding at the beginning of the
document if ASCII-savvy, or else the last ASCII-savvy encoding
loaded. For example, if you load |LY1,LGR|, then it is set to |LY1|,
but if you load |LY1,T2A| it is set to |T2A|. The symbol encodings
|TS1|, |T3|, and |TS3| are not taken into account, since they are not
used for ``ordinary'' text (they are stored in |\BabelNonText|, used
in some special cases when no Latin encoding is explicitly set).

The foregoing rules (which are applied ``at begin document'') cover
most of the cases. No assumption is made on characters above
127, which may not follow the LICR conventions -- the goal is just
to ensure most of the ASCII letters and symbols are the right ones.

\subsection{Selecting directions}
\label{bidi}

No macros to select the writing direction are provided, either --
writing direction is intrinsic to each script and therefore it is best
set by the language (which can be a dummy one). Furthermore, there
are in fact two right-to-left modes, depending on the language, which
differ in the way `weak' numeric characters are ordered (eg, Arabic
\%123 \textit{vs} Hebrew 123\%).

\begin{warning}
  The current code for \textbf{text} in \luatex{} should be considered
  essentially stable, but, of course, it is not bug-free and there
  can be improvements in the future, because setting bidi text has
  many subtleties (see for example <https://www.w3.org/TR/html-bidi/>).
  A basic stable version for other engines must wait. This applies to
  text; there is a basic support for \textbf{graphical} elements,
  including the |picture| environment (with \textsf{pict2e}) and
  \textsf{pfg/tikz}. Also, indexes and the like are under study, as
  well as math (there is progress in the latter, too, but for
  example |cases| may fail).

  An effort is being made to avoid incompatibilities in the future
  (this one of the reason currently bidi must be explicitly requested
  as a package option, with a certain bidi model, and also the |layout|
  options described below).
\end{warning}

\begin{warning}
  If characters to be mirrored are shown without changes with \luatex,
  try with the following line:
\begin{verbatim}
\babeladjust{bidi.mirroring=off}
\end{verbatim}
\end{warning}

There are some package options controlling bidi writing.

\Describe{bidi=}{\texttt{default} $\string|$ \texttt{basic}
  $\string|$ \texttt{basic-r} $\string|$ \texttt{bidi-l} $\string|$
  \texttt{bidi-r}}

\New{3.14} Selects the bidi algorithm to be used. With |default| the
bidi mechanism is just activated (by default it is not), but every
change must be marked up. In \xetex{} and \pdftex{} this is the only
option.

In \luatex, |basic-r| provides a simple and fast method for R text,
which handles numbers and unmarked L text within an R context many in
typical cases. \New{3.19} Finally, |basic| supports both L and R text,
and it is the preferred method (support for |basic-r| is currently
limited). (They are named \texttt{basic} mainly because they only
consider the intrinsic direction of scripts and weak directionality.)

\New{3.29} In \xetex, |bidi-r| and |bidi-l| resort to the package
\textsf{bidi} (by Vafa Khalighi). Integration is still somewhat
tentative, but it mostly works. For RL documents use the former, and
for LR ones use the latter.

There are samples on GitHub, under \texttt{/required/babel/samples}.
See particularly |lua-bidibasic.tex| and |lua-secenum.tex|.

\begin{example}
  The following text comes from the Arabic Wikipedia (article about
  Arabia). Copy-pasting some text from the Wikipedia is a good way to
  test this feature. Remember |basic| is available in \luatex{}
  only.
  \begingroup
% If you are looking at the code to see how it has been written, you
% will be disappointed :-). The following example is built ad hoc to
% emulate the final result to avoid dependencies, and therefore it's
% not "real" code.
\setmonofont[Scale=.87,Script=Arabic]{DejaVu Sans Mono} \catcode`@=13
\def@#1{\ifcase#1\relax \egroup \or \bgroup\textdir TLT \else
\bgroup\textdir TRT \pardir TRT \fi}
\begin{verbatim}
\documentclass{article}

\usepackage[_bidi=basic_]{babel}

_\babelprovide[import, main]{arabic}_

\babelfont{rm}{FreeSerif}

\begin{document}

@9وقد عرفت شبه جزيرة العرب طيلة العصر الهيليني )الاغريقي( بـ
@1Arabia@0 أو @1Aravia@0 )بالاغريقية @1Αραβία@0(، استخدم الرومان ثلاث
بادئات بـ@1“Arabia”@0 على ثلاث مناطق من شبه الجزيرة العربية، إلا أنها
حقيقةً كانت أكبر مما تعرف عليه اليوم.

@0\end{document}
\end{verbatim}
\endgroup
\end{example}

\begin{example}
  With |bidi=basic| \textit{both} L and R text can be
  mixed without explicit markup (the latter will be only necessary in
  some special cases where the Unicode algorithm fails). It is used much
  like |bidi=basic-r|, but with R text inside L text you may want to map
  the font so that the correct features are in force. This is accomplished
  with an option in |\babelprovide|, as illustrated:
    \begingroup
  % If you are looking at the code to see how it has been written, you
  % will be disappointed :-). The following example is built ad hoc to
  % emulate the final result to avoid dependencies, and therefore it's
  % not "real" code.
  \setmonofont[Scale=.87,Script=Arabic]{DejaVu Sans Mono} \catcode`@=13
  \def@#1{\ifcase#1\relax \egroup \or \bgroup\textdir TRT \else
  \bgroup\textdir TLT \pardir TLT \fi}
\begin{verbatim}
\documentclass{book}

\usepackage[english, _bidi=basic_]{babel}

\babelprovide[_onchar=ids fonts_]{arabic}

\babelfont{rm}{Crimson}
\babelfont[*arabic]{rm}{FreeSerif}

\begin{document}

Most Arabic speakers consider the two varieties to be two registers
of one language, although the two registers can be referred to in
Arabic as @1فصحى العصر@0 \textit{fuṣḥā l-ʻaṣr} (MSA) and
@1فصحى التراث@0 \textit{fuṣḥā t-turāth} (CA).

\end{document}
\end{verbatim}
  \endgroup
  In this example, and thanks to |onchar=ids fonts|, any Arabic letter
  (because the language is |arabic|) changes its font to that set for
  this language (here defined via |*arabic|, because Crimson does not
  provide Arabic letters).
\end{example}

\begin{note}
  Boxes are “black boxes”. Numbers inside an |\hbox| (for example
  in a |\ref|) do not know anything about the surrounding chars. So,
  |\ref{A}-\ref{B}| are not rendered in the visual order A-B, but in the
  wrong one B-A (because the hyphen does not “see” the digits inside the
  |\hbox|’es). If you need |\ref| ranges, the best option is to define
  a dedicated macro like this (to avoid explicit direction changes in the
  body; here |\texthe| must be defined to select the main language):
\begin{verbatim}
\newcommand\refrange[2]{\babelsublr{\texthe{\ref{#1}}-\texthe{\ref{#2}}}}
\end{verbatim}

  In the future a more complete method, reading recursively boxed text, may
  be added.
\end{note}

\Describe{layout=}{\texttt{sectioning} $\string|$
                   \texttt{counters}  $\string|$
                   \texttt{lists}  $\string|$
                   \texttt{contents}  $\string|$
                   \texttt{footnotes}  $\string|$
                   \texttt{captions}  $\string|$
                   \texttt{columns} $\string|$                
                   \texttt{graphics} $\string|$
                   \texttt{extras}}

\New{3.16} \textit{To be expanded}. Selects which layout elements are
adapted in bidi documents, including some text elements (except with
options loading the |bidi| package, which provides its own mechanism to
control these elements). You may use several options with a
dot-separated list (eg, |layout=counters.contents.sectioning|). This
list will be expanded in future releases. Note not all options are
required by all engines.

\begin{description}
\renewcommand\makelabel[1]{%
  \hspace\labelsep\normalfont\ttfamily\color{thered}#1}
\itemsep=-\parskip

\item[sectioning] makes sure the sectioning macros are typeset in the
  main language, but with the title text in the current language (see
  below |\BabelPatchSection| for further details). 

\item[counters] required in all engines (except \luatex{} with
  |bidi=basic|) to reorder section numbers and the like (eg,
  \m{subsection}.\m{section}); required in \xetex{} and \pdftex{} for
  counters in general, as well as in \luatex{} with |bidi=default|;
  required in \luatex{} for numeric footnote marks $>$9 with
  |bidi=basic-r| (but \textit{not} with |bidi=basic|); note, however,
  it can depend on the counter format.

  With |counters|, |\arabic| is not only considered L text always (with
  |\babelsublr|, see below), but also an ``isolated'' block which does
  not interact with the surrounding chars. So, while |1.2| in R text is
  rendered in that order with |bidi=basic| (as a decimal number), in
  |\arabic{c1}.\arabic{c2}| the visual order is \textit{c2.c1}. Of
  course, you may always adjust the order by changing the language, if
  necessary.\footnote{Next on the roadmap are counters and numeral
  systems in general. Expect some minor readjustments.}

\item[lists] required in \xetex{} and \pdftex{}, but only in
bidirectional (with both R and L paragraphs) documents in \luatex{}.

\begin{warning}
  As of April 2019 there is a bug with |\parshape| in \luatex{} (a
  \TeX{} primitive) which makes lists to be horizontally misplaced if
  they are inside a |\vbox| (like |minipage|) and the current direction
  is different from the main one. A workaround is to restore the main
  language before the box and then set the local one inside.
\end{warning}

\item[contents] required in \xetex{} and \pdftex{}; in \luatex{}
  toc entries are R by default if the main language is R.

\item[columns] required in \xetex{} and \pdftex{} to reverse the
  column order (currently only the standard two-column mode); in
  \luatex{} they are R by default if the main language is R (including
  \textsf{multicol}).

\item[footnotes] not required in monolingual documents, but it may be
  useful in bidirectional documents (with both R and L paragraphs) in all
  engines; you may use alternatively |\BabelFootnote| described below
  (what this option does exactly is also explained there).

\item[captions] is similar to |sectioning|, but for |\caption|; not
  required in monolingual documents with \luatex{}, but may be
  required in \xetex{} and \pdftex{} in some styles (support for the
  latter two engines is still experimental) \New{3.18}.

\item[tabular] required in \luatex{} for R |tabular|, so that the first
  column is the right one (it has been tested only with simple tables,
  so expect some readjustments in the future); ignored in \pdftex{} or
  \xetex{} (which will not support a similar option in the short term).
  It patches an internal command, so it might be ignored by some
  packages and classes (or even raise an error). \New{3.18}.

\item[graphics] modifies the |picture| environment so that the whole
figure is L but the text is R. It \textit{does not} work with the
standard |picture|, and \textit{pict2e} is required. It attempts to do
the same for \textsf{pgf/tikz}. Somewhat experimental. \New{3.32}.

\item[extras] is used for miscellaneous readjustments which do not fit into
  the previous groups. Currently redefines in \luatex{} |\underline| and
  |\LaTeX2e| \New{3.19}.
\end{description}

\begin{example}
  Typically, in an Arabic document you would need:
\begin{verbatim}
\usepackage[bidi=basic,
            layout=counters.tabular]{babel}
\end{verbatim}
\end{example}

\Describe{\babelsublr}{\marg{lr-text}}

Digits in \pdftex{} must be marked up explicitly (unlike \luatex{} with
|bidi=basic| or |bidi=basic-r| and, usually, \xetex{}). This command is
provided to set \marg{lr-text} in L mode if necessary. It's intended
for what Unicode calls weak characters, because words are best set with
the corresponding language. For this reason, there is no |rl|
counterpart.

Any |\babelsublr| in \textit{explicit} L mode is ignored. However, with
|bidi=basic| and \textit{implicit} L, it first returns to R and then
switches to explicit L. To clarify this point, consider, in an R 
context:
\begin{verbatim}
RTL A ltr text \thechapter{} and still ltr RTL B
\end{verbatim}
There are \textit{three} R blocks and \textit{two} L blocks, and the
order is \textit{RTL B and still ltr 1 ltr text RTL A}. This is by
design to provide the proper behavior in the most usual cases — but if
you need to use |\ref| in an L text inside R, the L text must be marked
up explictly; for example:
\begin{verbatim}
RTL A \foreignlanguage{english}{ltr text \thechapter{} and still ltr} RTL B
\end{verbatim}

\Describe{\BabelPatchSection}{\marg{section-name}}

Mainly for bidi text, but it can be useful in other cases.
|\BabelPatchSection| and the corresponding option |layout=sectioning|
takes a more logical approach (at least in many cases) because it
applies the global language to the section format (including the
|\chaptername| in |\chapter|), while the section text is still the
current language. The latter is passed to tocs and marks, too,
and with |sectioning| in |layout| they both reset the “global” language
to the main one, while the text uses the “local” language.

With |layout=sectioning| all the standard sectioning commands are
redefined (it also “isolates” the page number in heads, for a proper
bidi behavior), but with this command you can set them individually if
necessary (but note then tocs and marks are not touched).

\Describe{\BabelFootnote}{\marg{cmd}\marg{local-language}%
  \marg{before}\marg{after}}

\New{3.17} Something like:
\begin{verbatim}
\BabelFootnote{\parsfootnote}{\languagename}{(}{)}
\end{verbatim}
defines |\parsfootnote| so that |\parsfootnote{note}| is equivalent to:
\begin{verbatim}
\footnote{(\foreignlanguage{\languagename}{note})}
\end{verbatim}
but the footnote itself is typeset in the main language (to unify its
direction). In addition, |\parsfootnotetext| is defined. The option
|footnotes| just does the following:
\begin{verbatim}
\BabelFootnote{\footnote}{\languagename}{}{}%
\BabelFootnote{\localfootnote}{\languagename}{}{}%
\BabelFootnote{\mainfootnote}{}{}{}
\end{verbatim}
(which also redefine |\footnotetext| and define |\localfootnotetext|
and |\mainfootnotetext|). If the language argument is empty, then no
language is selected inside the argument of the footnote. Note this
command is available always in bidi documents, even without
|layout=footnotes|.

\begin{example}
  If you want to preserve directionality in footnotes and there are
  many footnotes entirely in English, you can define:
\begin{verbatim}
\BabelFootnote{\enfootnote}{english}{}{.}
\end{verbatim}
  It adds a period outside the English part, so that it is placed
  at the left in the last line. This means the dot the end of the
  footnote text should be omitted.
\end{example}

\subsection{Language attributes}

\DescribeMacro{\languageattribute}

This is a user-level command, to be used in the preamble of a
document (after |\usepackage[...]{babel}|), that declares which
attributes are to be used for a given language. It takes two
arguments: the first is the name of the language; the second,
a (list of) attribute(s) to be used. Attributes must be set in the
preamble and only once -- they cannot be turned on and off.
The command checks whether the language is known in this document
and whether the attribute(s) are known for this language.

Very often, using a \textit{modifier} in a package option is better.

Several language definition files use their own methods to set
options. For example, \textsf{french} uses |\frenchsetup|,
\textsf{magyar} (1.5) uses |\magyarOptions|; modifiers provided by
|spanish| have no attribute counterparts. Macros setting
options are also used (eg, |\ProsodicMarksOn| in \textsf{latin}).

\subsection{Hooks}

\New{3.9a} A hook is a piece of code to be executed at certain
events. Some hooks are predefined when \luatex{} and \xetex{} are
used.

\Describe{\AddBabelHook}{\oarg{lang}\marg{name}\marg{event}\marg{code}}

The same name can be applied to several events. Hooks may be enabled
and disabled for all defined events with |\EnableBabelHook|\marg{name},
|\DisableBabelHook|\marg{name}. Names containing the string |babel| are
reserved (they are used, for example, by |\useshortands*| to add a hook
for the event |afterextras|). \New{3.33} They may be also applied to a
specific language with the optional argument; language-specific
settings are executed after global ones.

Current events are the following; in some of them you can use one to
three \TeX{} parameters (|#1|, |#2|, |#3|), with the meaning given:
\begin{description}
\renewcommand\makelabel[1]{%
  \hspace\labelsep\normalfont\ttfamily\color{thered}#1}
\itemsep=-\parskip
\item[adddialect] (language name, dialect name) Used by
  \file{luababel.def} to load the patterns if not preloaded.
\item[patterns] (language name, language with encoding) Executed just
  after the |\language| has been set. The second argument has the
  patterns name actually selected (in the form of either |lang:ENC| or
  |lang|).
\item[hyphenation] (language name, language with encoding) Executed
  locally just before exceptions given in |\babelhyphenation| are
  actually set.
\item[defaultcommands] Used (locally) in |\StartBabelCommands|.
\item[encodedcommands] (input, font encodings) Used (locally) in
  |\StartBabelCommands|. Both \xetex{} and \luatex{} make sure the
  encoded text is read correctly.
\item[stopcommands] Used to reset the above, if necessary.
\item[write] This event comes just after the switching commands are
  written to the |aux| file.
\item[beforeextras] Just before executing |\extras|\m{language}. This
  event and the next one should not contain language-dependent code
  (for that, add it to |\extras|\m{language}).
\item[afterextras] Just after executing |\extras|\m{language}. For
  example, the following deactivates shorthands in all languages:
\begin{verbatim}
\AddBabelHook{noshort}{afterextras}{\languageshorthands{none}}
\end{verbatim}
\item[stringprocess] Instead of a parameter, you can manipulate the
  macro |\BabelString| containing the string to be defined with
  |\SetString|. For example, to use an expanded version of the string
  in the definition, write:
\begin{verbatim}
\AddBabelHook{myhook}{stringprocess}{%
  \protected@edef\BabelString{\BabelString}}
\end{verbatim}
\item[initiateactive] (char as active, char as other, original char)
  \New{3.9i} Executed just after a shorthand has been `initiated'. The three
  parameters are the same character with different catcodes: active,
  other (|\string|'ed) and the original one.
\item[afterreset] \New{3.9i} Executed when selecting a language just after
  |\originalTeX| is run and reset to its base value, before executing
  |\captions|\m{language} and |\date|\m{language}.
% STILL UNDER STUDY:
% \item[beforestart] \New{3.34} Executed either at the beginning of the
%   |aux| file (when read at the start of the document), or else at begin
%   document. In other words, it makes sure the code is executed always
%   and executed once. But be aware it is a somewhat dangerous, because
%   the scope in the first case is local, while in the second case is
%   global, so be careful with assignments.
\end{description}

Four events are used in \file{hyphen.cfg}, which are handled in a
quite different way for efficiency reasons -- unlike the precedent
ones, they only have a single hook and replace a default definition.
\begin{description}
\renewcommand\makelabel[1]{%
  \hspace\labelsep\normalfont\ttfamily\color{thered}#1}
\itemsep=-\parskip
\item[everylanguage] (language) Executed before every language patterns
  are loaded.
\item[loadkernel] (file) By default just defines a few basic commands.
  It can be used to define different versions of them or to load a file.
\item[loadpatterns] (patterns file) Loads the patterns file. Used by
  \file{luababel.def}.
\item[loadexceptions] (exceptions file) Loads the exceptions
  file. Used by \file{luababel.def}.
\end{description}

\Describe{\BabelContentsFiles}{}
\New{3.9a} This macro contains a list of ``toc'' types
requiring a command to switch the language. Its default value is
|toc,lof,lot|, but you may redefine it with |\renewcommand| (it's up
to you to make sure no toc type is duplicated).

\subsection{Languages supported by \babel{} with \textsf{ldf} files}

In the following table most of the languages supported by \babel{} with
and |.ldf| file are listed, together with the names of the option which
you can load \babel\ with for each language. Note this list is open and
the current options may be different. It does not include |ini| files.

\begin{description}
\itemsep=-\parskip
\sffamily
\item[Afrikaans] afrikaans
\item[Azerbaijani] azerbaijani
\item[Basque] basque
\item[Breton] breton
\item[Bulgarian] bulgarian
\item[Catalan] catalan
\item[Croatian] croatian
\item[Czech] czech
\item[Danish] danish
\item[Dutch] dutch
\item[English] english, USenglish, american, UKenglish,
     british, canadian, australian, newzealand
\item[Esperanto] esperanto
\item[Estonian] estonian
\item[Finnish] finnish
\item[French] french, francais, canadien, acadian
\item[Galician] galician
\item[German] austrian, german, germanb, ngerman, naustrian
\item[Greek] greek, polutonikogreek
\item[Hebrew] hebrew
\item[Icelandic] icelandic
\item[Indonesian] indonesian (bahasa, indon, bahasai)
\item[Interlingua] interlingua
\item[Irish Gaelic] irish
\item[Italian] italian
\item[Latin] latin
\item[Lower Sorbian] lowersorbian
\item[Malay] malay, melayu (bahasam)
\item[North Sami] samin
\item[Norwegian] norsk, nynorsk
\item[Polish] polish
\item[Portuguese] portuguese, brazilian (portuges, brazil)\footnote{The
two last name comes from the times when they had to be shortened to 8
characters}
\item[Romanian] romanian
\item[Russian] russian
\item[Scottish Gaelic] scottish
\item[Spanish]  spanish
\item[Slovakian] slovak
\item[Slovenian]  slovene
\item[Swedish] swedish
\item[Serbian] serbian
\item[Turkish] turkish
\item[Ukrainian] ukrainian
\item[Upper Sorbian] uppersorbian
\item[Welsh] welsh
\end{description}

There are more languages not listed above, including \textsf{hindi,
thai, thaicjk, latvian, turkmen, magyar, mongolian, romansh,
lithuanian, spanglish, vietnamese, japanese, pinyin, arabic, farsi,
ibygreek, bgreek, serbianc, frenchle, ethiop} and \textsf{friulan}.

Most of them work out of the box, but some may require extra fonts,
encoding files, a preprocessor or even a complete framework (like
\textsf{CJK} or \textsf{luatexja}). For example, if you have got the
\textsf{velthuis/devnag} package, you can create a file with extension
|.dn|:
\begin{verbatim}
\documentclass{article}
\usepackage[hindi]{babel}
\begin{document}
{\dn devaanaa.m priya.h}
\end{document}
\end{verbatim}
Then you preprocess it with |devnag| \m{file}, which creates
\m{file}|.tex|; you can then typeset the latter with \LaTeX.

\subsection{Unicode character properties in \luatex}

\New{3.32} Part of the \babel{} job is to apply Unicode rules to some
script-specific features based on some properties. Currently, they are
3, namely, direction (ie, bidi class), mirroring glyphs, and line
breaking for CJK scripts. These properties are stored in \textsf{lua}
tables, which you can modify with the following macro (for example,
to set them for glyphs in the PUA).

\Describe{\babelcharproperty}{\marg{char-code}\oarg{to-char-code}%
          \marg{property}\marg{value}}

\New{3.32} Here, \marg{char-code} is a number (with \TeX{} syntax).
With the optional argument, you can set a range of values. There are
three properties (with a short name, taken from Unicode): |direction|
(|bc|), |mirror| (|bmg|), |linebreak| (|lb|). The settings are global,
and this command is allowed only in vertical mode (the preamble or
between paragraphs).

For example:
\begin{verbatim}
\babelcharproperty{`¿}{mirror}{`?}   
\babelcharproperty{`-}{direction}{l}  % or al, r, en, an, on, et, cs
\babelcharproperty{`)}{linebreak}{cl} % or id, op, cl, ns, ex, in, hy
\end{verbatim}

\New{3.39} Another property is |locale|, which adds characters to the
list used by |onchar| in |\babelprovide|, or, if the last argument is
empty, removes them. The last argument is the locale name:
\begin{verbatim}
\babelcharproperty{`,}{locale}{english}
\end{verbatim}

\subsection{Tweaking some features}

\Describe{\babeladjust}{\marg{key-value-list}}

\New{3.36} Sometimes you might need to disable some \babel{} features.
Currently this macro understands the following keys (and only for
\textsf{luatex}), with values |on| or |off|: |bidi.text|,
|bidi.mirroring|, |bidi.mapdigits|, |layout.lists|, |layout.tabular|,
|linebreak.sea|, |linebreak.cjk|, |justify.arabic|. For example, you can set
|\babeladjust{bidi.text=off}| if you are using an alternative algorithm
or with large sections not requiring it. Use with care, because these
options do not deactivate other related options (like paragraph
direction with |bidi.text|).

\subsection{Tips, workarounds, known issues and notes}

\begin{itemize}
\item If you use the document class \cls{book} \emph{and} you use
  |\ref| inside the argument of |\chapter| (or just use |\ref| inside
  |\MakeUppercase|), \LaTeX\ will keep complaining about an undefined
  label.  To prevent such problems, you can revert to using
  uppercase labels, you can use |\lowercase{\ref{foo}}| inside the
  argument of |\chapter|, or, if you will not use shorthands in
  labels, set the |safe| option to |none| or |bib|.

\item\catcode`\|=12\relax Both \textsf{ltxdoc} and \textsf{babel} use
  \verb|\AtBeginDocument| to change some catcodes, and babel reloads
  \textsf{hhline} to make sure \verb|:| has the right one, so if you
  want to change the catcode of \verb/|/ it has to be done using the
  same method at the proper place, with
\begin{verbatim}
\AtBeginDocument{\DeleteShortVerb{\|}}
\end{verbatim}
  \textit{before} loading babel. This way, when the document begins
  the sequence is (1) make \verb/|/ active (\textsf{ltxdoc}); (2) make
  it unactive (your settings); (3) make babel shorthands active
  (\textsf{babel)}; (4) reload \textsf{hhline} (\textsf{babel}, now
  with the correct catcodes for \verb/|/ and
  \verb|:|).\catcode`\|=\active

\item Documents with several input encodings are not frequent, but
  sometimes are useful. You can set different encodings for different
  languages as the following example shows:
\begin{verbatim}
\addto\extrasfrench{\inputencoding{latin1}}
\addto\extrasrussian{\inputencoding{koi8-r}}
\end{verbatim}
 \item For the hyphenation to work correctly, lccodes cannot change,
   because \TeX{} only takes into account the values when the
   paragraph is hyphenated, i.e., when it has been
   finished.\footnote{This explains why \LaTeX{} assumes the lowercase
   mapping of T1 and does not provide a tool for multiple
   mappings. Unfortunately, \cs{savinghyphcodes} is not a solution
   either, because lccodes for hyphenation are frozen in the format
   and cannot be changed.} So, if you write a chunk of French text
   with |\foreinglanguage|, the apostrophes might not be taken into
   account. This is a limitation of \TeX, not of
   \babel. Alternatively, you may use |\useshorthands| to activate |'|
   and |\defineshorthand|, or redefine |\textquoteright| (the latter
   is called by the non-ASCII right quote).
\item \verb|\bibitem| is out of sync with \verb|\selectlanguage| in
  the \file{.aux} file. The reason is \verb|\bibitem| uses
  \verb|\immediate| (and others, in fact), while
  \verb|\selectlanguage| doesn't. There is no known workaround.
\item Babel does not take into account |\normalsfcodes| and
  (non-)French spacing is not always properly (un)set by
  languages. However, problems are unlikely to happen and therefore
  this part remains untouched in version 3.9 (but it is in the `to
  do' list).
\item Using a character mathematically active (ie, with math code
  |"8000|) as a shorthand can make \TeX{} enter in an infinite loop in
  some rare cases. (Another issue in the `to do' list, although there
  is a partial solution.)
\end{itemize}

The following packages can be useful, too (the list is still
far from complete):
\begin{description}
\itemsep=-\parskip
\item[csquotes] Logical markup for quotes.
\item[iflang] Tests correctly the current language.
\item[hyphsubst] Selects a different set of patterns for a language.
\item[translator] An open platform for packages that need to be
  localized.
\item[siunitx] Typesetting of numbers and physical quantities.
\item[biblatex] Programmable bibliographies and citations.
\item[bicaption] Bilingual captions.
\item[babelbib] Multilingual bibliographies.
\item[microtype] Adjusts the typesetting according to
some languages (kerning and spacing). Ligatures can be disabled.
\item[substitutefont] Combines fonts in several encodings.
\item[mkpattern] Generates hyphenation patterns.
\item[tracklang] Tracks which languages have been requested.
\item[ucharclasses] (\xetex) Switches fonts when you switch from one
  Unicode block to another.
\item[zhspacing] Spacing for CJK documents in \xetex.
\end{description}

\subsection{Current and future work}

The current work is focused on the so-called complex scripts in \luatex{}.
In 8-bit engines, \babel{} provided a basic support for bidi text as
part of the style for Hebrew, but it is somewhat unsatisfactory and
internally replaces some hardwired commands by other hardwired commands
(generic changes would be much better).

Useful additions would be, for example, time, currency, addresses and
personal names.\footnote{See for example POSIX, ISO 14652 and the
Unicode Common Locale Data Repository (CLDR). Those systems, however,
have limited application to \TeX\ because their aim is just to display
information and not fine typesetting.}. But that is the easy
part, because they don't require modifying the \LaTeX{} internals.
Calendars (Arabic, Persian, Indic, etc.) are under study.

Also interesting are differences in the sentence structure or related
to it. For example, in Basque the number precedes the name (including
chapters), in Hungarian ``from (1)'' is ``(1)-b\H{o}l'', but ``from
(3)'' is ``(3)-b\'{o}l'', in Spanish an item labelled
``3.$^{\textrm{\scriptsize o}}$'' may be referred to as either
``\'{\i}tem 3.$^{\textrm{\scriptsize o}}$'' or
``3.$^{\textrm{\scriptsize er}}$ \'{\i}tem'', and so on.

An option to manage bidirectional document layout in \luatex{} (lists,
footnotes, etc.) is almost finished, but \xetex{} required more work.
Unfortunately, proper support for \xetex{} requires patching somehow
lots of macros and packages (and some issues related to |\special|s
remain, like color and hyperlinks), so \babel{} resorts to the
\textsf{bidi} package (by Vafa Khalighi). See the \babel{} repository
for a small example (|xe-bidi|).

\subsection{Tentative and experimental code}

See the code section for |\foreignlanguage*| (a new starred
version of |\foreignlanguage|).

For old an deprecated functions, see the wiki.

\medskip
\textbf{Options for locales loaded on the fly}

\New{3.51} |\babeladjust{ autoload.options = ... }| sets the options
when a language is loaded on the fly (by default, no options). A
typical value would be |import|, which defines captions, date,
numerals, etc., but ignores the code in the |tex| file (for example,
extended numerals in Greek).

\medskip
\textbf{Labels}

\New{3.48} There is some work in progress for \babel{} to deal with
labels, both with the relation to captions (chapters, part), and how
counters are used to define them. It is still somewhat tentative
because it is far from trivial -- see the wiki for further details.

\section{Loading languages with \file{language.dat}}

\TeX{} and most engines based on it (pdf\TeX, \xetex, $\epsilon$-\TeX,
the main exception being \luatex) require hyphenation patterns to be
preloaded when a format is created (eg, \LaTeX, Xe\LaTeX,
pdf\LaTeX). \babel{} provides a tool which has become standard in many
distributions and based on a ``configuration file'' named
\file{language.dat}. The exact way this file is used depends on the
distribution, so please, read the documentation for the latter (note
also some distributions generate the file with some tool).

\New{3.9q} With \luatex, however, patterns are loaded on the fly when
requested by the language (except the ``0th'' language, typically
\textsf{english}, which is preloaded always).\footnote{This feature
was added to 3.9o, but it was buggy. Both 3.9o and 3.9p are
deprecated.} Until 3.9n, this task was delegated to the package
\textsf{luatex-hyphen}, by Khaled Hosny, \'Elie Roux, and Manuel
P\'egouri\'e-Gonnard, and required an extra file named
|language.dat.lua|, but now a new mechanism has been devised based
solely on |language.dat|. \textbf{You must rebuild the formats} if
upgrading from a previous version.  You may want to have a local
|language.dat| for a particular project (for example, a book on
Chemistry).\footnote{The loader for lua(e)tex is slightly different as
it's not based on \babel{} but on \texttt{etex.src}. Until 3.9p it
just didn't work, but thanks to the new code it works by reloading the
data in the \babel{} way, i.e., with \texttt{language.dat}.}

\subsection{Format}

In that file the person who maintains a \TeX\ environment has to record
for which languages he has hyphenation patterns \emph{and} in which
files these are stored\footnote{This is because different operating
systems sometimes use \emph{very} different file-naming
conventions.}. When hyphenation exceptions are stored in a separate
file this can be indicated by naming that file \emph{after} the file
with the hyphenation patterns.

The file can contain empty lines and comments, as well as lines which
start with an equals (\texttt{=}) sign. Such a line will instruct
\LaTeX\ that the hyphenation patterns just processed have to be known
under an alternative name. Here is an example:
\begin{verbatim}
% File    : language.dat
% Purpose : tell iniTeX what files with patterns to load.
english    english.hyphenations
=british

dutch      hyphen.dutch exceptions.dutch % Nederlands
german hyphen.ger
\end{verbatim}

You may also set the font encoding the patterns are intended for by
following the language name by a colon and the encoding
code.\footnote{This is not a new feature, but in former versions it
didn't work correctly.} For example:
\begin{verbatim}
german:T1 hyphenT1.ger
german hyphen.ger
\end{verbatim}
With the previous settings, if the encoding when the language is
selected is |T1| then the patterns in \file{hyphenT1.ger} are
used, but otherwise use those in \file{hyphen.ger} (note the encoding
can be set in |\extras|\m{lang}).

A typical error when using \babel{} is the following:
\begin{verbatim}
No hyphenation patterns were preloaded for
the language `<lang>' into the format.
Please, configure your TeX system to add them and
rebuild the format. Now I will use the patterns
preloaded for english instead}}
\end{verbatim}
It simply means you must reconfigure \file{language.dat}, either by
hand or with the tools provided by your distribution.

\section{The interface between the core of \babel{} and the language
definition files}

The \textit{language definition files} (ldf) must conform to a
number of conventions, because these files have to fill in the gaps
left by the common code in \file{babel.def}, i.\,e., the
definitions of the macros that produce texts.  Also the
language-switching possibility which has been built into the
\babel{} system has its implications.

The following assumptions are made:
\begin{itemize}
\item Some of the language-specific definitions might be used by plain
  \TeX\ users, so the files have to be coded so that they can be read
  by both \LaTeX\ and plain \TeX. The current format can be checked by
  looking at the value of the macro |\fmtname|.
\item The common part of the \babel{} system redefines a number of
  macros and environments (defined previously in the document style)
  to put in the names of macros that replace the previously hard-wired
  texts.  These macros have to be defined in the language definition
  files.
\item The language definition files must define five macros, used to
  activate and deactivate the language-specific definitions.  These
  macros are |\|\langvar|hyphenmins|, |\captions|\langvar,
  |\date|\langvar, |\extras|\langvar\ and |\noextras|\langvar (the
  last two may be left empty); where \langvar\ is either the name of
  the language definition file or the name of the \LaTeX\ option that
  is to be used. These macros and their functions are discussed
  below. You must define all or none for a language (or a dialect);
  defining, say, |\date|\langvar\ but not |\captions|\langvar\ does
  not raise an error but can lead to unexpected results.
\item When a language definition file is loaded, it can define
  |\l@|\langvar\ to be a dialect of |\language0| when |\l@|\langvar\
  is undefined.
\item Language names must be all lowercase. If an unknown language is
  selected, \babel{} will attempt setting it after lowercasing its
  name.
\item The semantics of modifiers is not defined (on purpose). In
  most cases, they will just be simple separated options (eg,
  \texttt{spanish}), but a language might require, say, a set of
  options organized as a tree with suboptions (in such a case, the
  recommended separator is \verb|/|).
\end{itemize}

Some recommendations:
\begin{itemize}
\item The preferred shorthand is |"|, which is not used in \LaTeX{}
  (quotes are entered as |``| and |''|). Other good choices are
  characters which are not used in a certain context (eg, |=| in an
  ancient language). Note however |=|, |<|, |>|, |:| and the like
  can be dangerous, because they may be used as part of the syntax
  of some elements (numeric expressions, key/value pairs, etc.).
\item Captions should not contain shorthands or encoding-dependent
  commands (the latter is not always possible, but should be clearly
  documented). They should be defined using the LICR. You may
  also use the new tools for encoded strings, described below.
\item Avoid adding things to |\noextras|\m{lang} except for umlauthigh
  and friends, |\bbl@deactivate|, |\bbl@(non)frenchspacing|, and
  language-specific macros. Use always, if possible, |\bbl@save| and
  |\bbl@savevariable| (except if you still want to have access to the
  previous value). Do not reset a macro or a setting to a hardcoded
  value. Never. Instead save its value in |\extras|\m{lang}.
\item Do not switch scripts. If you want to make sure a set of glyphs
  is used, switch either the font encoding (low-level) or the language
  (high-level, which in turn may switch the font encoding). Usage of things
  like |\latintext| is deprecated.\footnote{But not removed, for backward
  compatibility.}
\item Please, for ``private'' internal macros do not use the |\bbl@|
  prefix. It is used by \babel{} and it can lead to incompatibilities.
\end{itemize}

There are no special requirements for documenting your language
files. Now they are not included in the base \babel{} manual, so
provide a standalone document suited for your needs, as well as other
files you think can be useful. A PDF and a ``readme'' are strongly
recommended.

\subsection{Guidelines for contributed languages}
\label{contribute}

Currently, the easiest way to contribute a new language is by taking
one the the 500 or so |ini| templates available on GitHub as a basis.
Just make a pull request o dowonload it and then, after filling the
fields, sent it to me. Fell free to ask for help or to make feature
requests.

As to \texttt{ldf} files, now language files are “outsourced” and are
located in a separate directory
(\texttt{/macros/latex/contrib/babel-contrib}), so that they are
contributed directly to CTAN (please, do not send to me language styles
just to upload them to CTAN).

Of course, placing your style files in this directory is not mandatory,
but if you want to do it, here are a few guidelines.

\begin{itemize}
\item Do not hesitate stating on the file heads you are the author and the
  maintainer, if you actually are. There is no need to state the babel
  maintainer(s) as authors if they have not contributed significantly
  to your language files.
\item Fonts are not strictly part of a language, so they are best placed
  in the corresponding TeX tree. This includes not only \texttt{tfm},
  \texttt{vf}, \texttt{ps1}, \texttt{otf}, \texttt{mf} files and the
  like, but also \texttt{fd} ones.
\item Font and input encodings are usually best placed in the
  corresponding tree, too, but sometimes they belong more naturally to
  the babel style.  Note you may also need to define a LICR.
\item \Babel{} ldf files may just interface a framework, as it happens often
  with Oriental languages/scripts. This framework is best placed in its
  own directory.
\end{itemize}

The following page provides a starting point for \texttt{ldf} files:
\texttt{http://www.texnia.com/incubator.html}. See also
\texttt{https://latex3.github.io/babel/guides/list-of-locale-templates.html}.

If you need further assistance and technical advice in the
development of language styles, I am willing to help you.  And of
course, you can make any suggestion you like.

\subsection{Basic macros}

In the core of the \babel{} system, several macros are defined for use
in language definition files. Their purpose is to make a new language
known. The first two are related to hyphenation patterns.

\DescribeMacro{\addlanguage}
The macro |\addlanguage| is a non-outer version of the macro
|\newlanguage|, defined in \file{plain.tex} version~3.x. Here
``language'' is used in the \TeX{} sense of set of hyphenation
patterns.

\DescribeMacro{\adddialect}
The macro |\adddialect| can be used when two languages can (or
must) use the same hyphenation patterns. This can also be useful
for languages for which no patterns are preloaded in the
format. In such cases the default behavior of the \babel{}
system is to define this language as a `dialect' of the language
for which the patterns were loaded as |\language0|.  Here
``language'' is used in the \TeX{} sense of set of hyphenation
patterns.

\DescribeMacro{\<lang>hyphenmins}
The macro |\|\langvar|hyphenmins| is used to store the values of
the |\lefthyphenmin| and |\righthyphenmin|. Redefine this macro
to set your own values, with two numbers corresponding to these
two parameters. For example:
\begin{verbatim}
\renewcommand\spanishhyphenmins{34}
\end{verbatim}
(Assigning |\lefthyphenmin| and |\righthyphenmin| directly in
|\extras<lang>| has no effect.)

\DescribeMacro{\providehyphenmins}
The macro |\providehyphenmins| should be used in the language
definition files to set |\lefthyphenmin| and |\righthyphenmin|. This
macro will check whether these parameters were provided by the
hyphenation file before it takes any action. If these values have been
already set, this command is ignored (currently, default pattern files
do \textit{not} set them).

\DescribeMacro{\captions\langvar}
The macro |\captions|\langvar\ defines the macros that
hold the texts to replace the original hard-wired texts.

\DescribeMacro{\date\langvar}
The macro |\date|\langvar\ defines |\today|.

\DescribeMacro{\extras\langvar}
The macro |\extras|\langvar\ contains all the extra definitions needed
for a specific language. This macro, like the following, is a hook --
you can add things to it, but it must not be used directly.

\DescribeMacro{\noextras\langvar}
Because we want to let the user switch
between languages, but we do not know what state \TeX\ might be in
after the execution of |\extras|\langvar, a macro that brings
\TeX\ into a predefined state is needed. It will be no surprise
that the name of this macro is |\noextras|\langvar.

\DescribeMacro{\bbl@declare@ttribute}
This is a command to be used in the language definition files for
declaring a language attribute. It takes three arguments: the
name of the language, the attribute to be defined, and the code
to be executed when the attribute is to be used.

\DescribeMacro{\main@language}
To postpone the activation of the definitions needed for a
language until the beginning of a document, all language
definition files should use |\main@language| instead of
|\selectlanguage|. This will just store the name of the language,
and the proper language will be activated at the start of the
document.

\DescribeMacro{\ProvidesLanguage}
The macro |\ProvidesLanguage| should be used to identify the
language definition files. Its syntax is similar to the syntax
of the \LaTeX\ command |\ProvidesPackage|.

\DescribeMacro{\LdfInit}
The macro |\LdfInit| performs a couple of standard checks that
must be made at the beginning of a language definition file,
such as checking the category code of the @-sign, preventing
the \file{.ldf} file from being processed twice, etc.

\DescribeMacro{\ldf@quit}
The macro |\ldf@quit| does work needed if a \file{.ldf} file was
processed earlier. This includes resetting the category code of the
@-sign, preparing the language to be activated at |\begin{document}|
time, and ending the input stream.

\DescribeMacro{\ldf@finish}
The macro |\ldf@finish| does work needed at the end of each \file{.ldf}
file. This includes resetting the category code of the @-sign, loading
a local configuration file, and preparing the language to be activated
at |\begin{document}| time.

\DescribeMacro{\loadlocalcfg}
After processing a language definition file,
\LaTeX\ can be instructed to load a local configuration
file. This file can, for instance, be used to add strings to
|\captions|\langvar\ to support local document
classes. The user will be informed that this
configuration file has been loaded. This macro is called by
|\ldf@finish|.

\DescribeMacro{\substitutefontfamily}
(Deprecated.) This command takes three arguments, a font encoding and
two font family names. It creates a font description file for the
first font in the given encoding. This \file{.fd} file will instruct
\LaTeX\ to use a font from the second family when a font from the
first family in the given encoding seems to be needed.

\subsection{Skeleton}

Here is the basic structure of an |ldf| file, with a language, a
dialect and an attribute. Strings are best defined using the method
explained in sec. \ref{s:strings} (\babel{} 3.9 and later).

\begin{verbatim}
\ProvidesLanguage{<language>}
     [2016/04/23 v0.0 <Language> support from the babel system]
\LdfInit{<language>}{captions<language>}

\ifx\undefined\l@<language>
  \@nopatterns{<Language>}
  \adddialect\l@<language>0
\fi

\adddialect\l@<dialect>\l@<language>

\bbl@declare@ttribute{<language>}{<attrib>}{%
  \expandafter\addto\expandafter\extras<language>
  \expandafter{\extras<attrib><language>}%
  \let\captions<language>\captions<attrib><language>}

\providehyphenmins{<language>}{\tw@\thr@@}

\StartBabelCommands*{<language>}{captions}
\SetString\chaptername{<chapter name>}
% More strings

\StartBabelCommands*{<language>}{date}
\SetString\monthiname{<name of first month>}
% More strings

\StartBabelCommands*{<dialect>}{captions}
\SetString\chaptername{<chapter name>}
% More strings

\StartBabelCommands*{<dialect>}{date}
\SetString\monthiname{<name of first month>}
% More strings

\EndBabelCommands

\addto\extras<language>{}
\addto\noextras<language>{}
\let\extras<dialect>\extras<language>
\let\noextras<dialect>\noextras<language>

\ldf@finish{<language>}
\end{verbatim}

\begin{note}
  If for some reason you want to load a package in your style, you
  should be aware it cannot be done directly in the \texttt{ldf} file,
  but it can be delayed with |\AtEndOfPackage|. Macros from external
  packages can be used \textit{inside} definitions in the \textsf{ldf}
  itself (for example, |\extras<language>|), but if executed directly,
  the code must be placed inside |\AtEndOfPackage|. A trivial example
  illustrating these points is:
\begin{verbatim}
\AtEndOfPackage{%
  \RequirePackage{dingbat}%       Delay package
  \savebox{\myeye}{\eye}}%        And direct usage
\newsavebox{\myeye}
\newcommand\myanchor{\anchor}%    But OK inside command
\end{verbatim}
\end{note}

\subsection{Support for active characters}

In quite a number of language definition files, active characters are
introduced. To facilitate this, some support macros are provided.

\DescribeMacro{\initiate@active@char}
The internal macro |\initiate@active@char| is used in language
definition files to instruct \LaTeX\ to give a character the category
code `active'. When a character has been made active it will remain
that way until the end of the document. Its definition may vary.

\DescribeMacro{\bbl@activate}
\DescribeMacro{\bbl@deactivate}
The command |\bbl@activate| is used to change the way an active
character expands. |\bbl@activate| `switches on' the active behavior
of the character. |\bbl@deactivate| lets the active character expand
to its former (mostly) non-active self.

\DescribeMacro{\declare@shorthand}
The macro |\declare@shorthand| is used to define the various
shorthands. It takes three arguments: the name for the collection of
shorthands this definition belongs to; the character (sequence) that
makes up the shorthand, i.e.\ |~| or |"a|; and the code to be executed
when the shorthand is encountered. (It does \textit{not} raise an
error if the shorthand character has not been ``initiated''.)

\DescribeMacro{\bbl@add@special}
\DescribeMacro{\bbl@remove@special}
The \TeX book states: ``Plain \TeX\ includes a macro called
|\dospecials| that is essentially a set macro, representing the set of
all characters that have a special category code.'' \cite[p.~380]{DEK}
It is used to set text `verbatim'.  To make this work if more
characters get a special category code, you have to add this character
to the macro |\dospecial|.  \LaTeX\ adds another macro called
|\@sanitize| representing the same character set, but without the
curly braces.  The macros |\bbl@add@special|\meta{char} and
|\bbl@remove@special|\meta{char} add and remove the character
\meta{char} to these two sets.

\subsection{Support for saving macro definitions}

Language definition files may want to \emph{re}define macros that
already exist. Therefore a mechanism for saving (and restoring) the
original definition of those macros is provided. We provide two macros
for this\footnote{This mechanism was introduced by Bernd Raichle.}.

\DescribeMacro{\babel@save}
To save the current meaning of any control sequence, the macro
|\babel@save| is provided. It takes one argument, \meta{csname}, the
control sequence for which the meaning has to be saved.

\DescribeMacro{\babel@savevariable}
A second macro is provided to save the current value of a variable.
In this context, anything that is allowed after the |\the| primitive
is considered to be a variable. The macro takes one argument, the
\meta{variable}.

The effect of the preceding macros is to append a piece of code to
the current definition of |\originalTeX|. When |\originalTeX| is
expanded, this code restores the previous definition of the control
sequence or the previous value of the variable.

\subsection{Support for extending macros}

\DescribeMacro{\addto}
The macro |\addto{|\meta{control sequence}|}{|\meta{\TeX\ code}|}| can
be used to extend the definition of a macro. The macro need not be
defined (ie, it can be undefined or |\relax|). This macro can, for
instance, be used in adding instructions to a macro like
|\extrasenglish|.

Be careful when using this macro, because depending on the case the
assignment can be either global (usually) or local (sometimes). That
does not seem very consistent, but this behavior is preserved for
backward compatibility. If you are using \pkg{etoolbox}, by Philipp
Lehman, consider using the tools provided by this package instead of
|\addto|.

\subsection{Macros common to a number of languages}

\DescribeMacro{\bbl@allowhyphens}
In several languages compound words are used. This means that when
\TeX\ has to hyphenate such a compound word, it only does so at the
`\texttt{-}' that is used in such words. To allow hyphenation in the
rest of such a compound word, the macro |\bbl@allowhyphens| can be
used.

\DescribeMacro{\allowhyphens}
Same as |\bbl@allowhyphens|, but does nothing if the encoding is
|T1|. It is intended mainly for characters provided as real glyphs by
this encoding but constructed with |\accent| in |OT1|.

Note the previous command (|\bbl@allowhyphens|) has different
applications (hyphens and discretionaries) than this one (composite
chars). Note also prior to version 3.7, |\allowhyphens| had the
behavior of |\bbl@allowhyphens|.

\DescribeMacro{\set@low@box}
For some languages, quotes need to be lowered to the baseline. For
this purpose the macro |\set@low@box| is available. It takes one
argument and puts that argument in an |\hbox|, at the baseline. The
result is available in |\box0| for further processing.

\DescribeMacro{\save@sf@q}
Sometimes it is necessary to preserve the |\spacefactor|.  For this
purpose the macro |\save@sf@q| is available. It takes one argument,
saves the current spacefactor, executes the argument, and restores the
spacefactor.

\DescribeMacro{\bbl@frenchspacing}
\DescribeMacro{\bbl@nonfrenchspacing}
The commands |\bbl@frenchspacing| and |\bbl@nonfrenchspacing| can be
used to properly switch French spacing on and off.

\subsection{Encoding-dependent strings}
\label{s:strings}

\New{3.9a} Babel 3.9 provides a way of defining strings in several
encodings, intended mainly for \luatex{} and \xetex. This is the only new
feature requiring changes in language files if you want to make use of
it.

Furthermore, it must be activated explicitly, with the package option
|strings|. If there is no |strings|, these blocks are ignored, except
|\SetCase|s (and except if forced as described below). In other words,
the old way of defining/switching strings still works and it's used by
default.

It consist is a series of blocks started with
|\StartBabelCommands|. The last block is closed with
|\EndBabelCommands|. Each block is a single group (ie, local
declarations apply until the next |\StartBabelCommands| or
|\EndBabelCommands|). An |ldf| may contain several series of this
kind.

Thanks to this new feature, string values and string language
switching are not mixed any more. No need of |\addto|. If the language
is |french|, just redefine |\frenchchaptername|.

\Describe\StartBabelCommands
  {\marg{language-list}\marg{category}\oarg{selector}}

The \m{language-list} specifies which languages the block is
intended for. A block is taken into account only if the
|\CurrentOption| is listed here. Alternatively, you can define
|\BabelLanguages| to a comma-separated list of languages to be
defined (if undefined, |\StartBabelCommands| sets it to
|\CurrentOption|). You may write |\CurrentOption| as the language,
but this is discouraged -- a explicit name (or names) is much better
and clearer.

A ``selector'' is a name to be used as value in package option
|strings|, optionally followed by extra info about the encodings to be
used. The name |unicode| must be used for \xetex{} and \luatex{} (the
key |strings| has also other two special values: |generic| and
|encoded|).

If a string is set several times (because several blocks are read),
the first one takes precedence (ie, it works much like
|\providecommand|).

Encoding info is |charset=| followed by a charset, which if given sets
how the strings should be translated to the internal representation
used by the engine, typically |utf8|, which is the only value
supported currently (default is no translations). Note |charset| is
applied by \luatex{} and \xetex{} when reading the file, not when the
macro or string is used in the document.

A list of font encodings which the strings are expected to work with
can be given after |fontenc=| (separated with spaces, if two or more) --
recommended, but not mandatory, although blocks without this key are
not taken into account if you have requested |strings=encoded|.

Blocks without a selector are read always if the key |strings| has
been used.  They provide fallback values, and therefore must be the
last blocks; they should be provided always if possible and all
strings should be defined somehow inside it; they can be the only
blocks (mainly LGC scripts using the LICR). Blocks without a selector
can be activated explicitly with |strings=generic| (no block is taken
into account except those). With |strings=encoded|, strings in those
blocks are set as default (internally, |?|). With |strings=encoded|
strings are protected, but they are correctly expanded in
|\MakeUppercase| and the like. If there is no key |strings|, string
definitions are ignored, but |\SetCase|s are still honored (in a
|encoded| way).

The \m{category} is either |captions|, |date| or |extras|. You must
stick to these three categories, even if no error is raised when using
other name.\footnote{In future releases further categories may be
added.\nb{like `monetary', `time', `address', `name', `case' or
`numeric'}} It may be empty, too, but in such a case using
|\SetString| is an error (but not |\SetCase|).

\begin{verbatim}
\StartBabelCommands{language}{captions}
  [unicode, fontenc=TU EU1 EU2, charset=utf8]
\SetString{\chaptername}{utf8-string}

\StartBabelCommands{language}{captions}
\SetString{\chaptername}{ascii-maybe-LICR-string}

\EndBabelCommands
\end{verbatim}

A real example is:
\begin{verbatim}
\StartBabelCommands{austrian}{date}
  [unicode, fontenc=TU EU1 EU2, charset=utf8]
  \SetString\monthiname{Jänner}

\StartBabelCommands{german,austrian}{date}
  [unicode, fontenc=TU EU1 EU2, charset=utf8]
  \SetString\monthiiiname{März}

\StartBabelCommands{austrian}{date}
  \SetString\monthiname{J\"{a}nner}

\StartBabelCommands{german}{date}
  \SetString\monthiname{Januar}

\StartBabelCommands{german,austrian}{date}
  \SetString\monthiiname{Februar}
  \SetString\monthiiiname{M\"{a}rz}
  \SetString\monthivname{April}
  \SetString\monthvname{Mai}
  \SetString\monthviname{Juni}
  \SetString\monthviiname{Juli}
  \SetString\monthviiiname{August}
  \SetString\monthixname{September}
  \SetString\monthxname{Oktober}
  \SetString\monthxiname{November}
  \SetString\monthxiiname{Dezenber}
  \SetString\today{\number\day.~%
    \csname month\romannumeral\month name\endcsname\space
    \number\year}

\StartBabelCommands{german,austrian}{captions}
  \SetString\prefacename{Vorwort}
  [etc.]

\EndBabelCommands
\end{verbatim}

When used in |ldf| files, previous values of |\|\m{category}\m{language}
are overridden, which means the old way to define strings still works
and used by default (to be precise, is first set to undefined and then
strings are added). However, when used in the preamble or in a
package, new settings are added to the previous ones, if the language
exists (in the \babel{} sense, ie, if |\date|\m{language} exists).

\Describe\StartBabelCommands{%
  \colorbox{thegrey}{\ttfamily\hskip-.2em*\hskip-.2em}%
  \marg{language-list}\marg{category}\oarg{selector}}
The starred version just forces |strings| to take a value -- if not set
as package option, then the default for the engine is used. This is
not done by default to prevent backward incompatibilities, but if you
are creating a new language this version is better. It's up to
the maintainers of the current languages to decide if using it is
appropriate.\footnote{This replaces in 3.9g a short-lived
\texttt{\string\UseStrings} which has been removed because it did
not work.}

\Describe{\EndBabelCommands}{}
Marks the end of the series of blocks.

\Describe{\AfterBabelCommands}{\marg{code}}
The code is delayed and executed at the global scope just after
|\EndBabelCommands|.

\Describe{\SetString}{\marg{macro-name}\marg{string}}
Adds \meta{macro-name} to the current category, and defines globally
\meta{lang-macro-name} to \meta{code} (after applying the
transformation corresponding to the current charset or defined with
the hook |stringprocess|).

Use this command to define strings, without including any ``logic'' if
possible, which should be a separated macro. See the example above for
the date.

\Describe{\SetStringLoop}{\marg{macro-name}\marg{string-list}}
A convenient way to define several ordered names at once. For example,
to define |\abmoniname|, |\abmoniiname|, etc. (and similarly with
|abday|):
\begin{verbatim}
\SetStringLoop{abmon#1name}{en,fb,mr,ab,my,jn,jl,ag,sp,oc,nv,dc}
\SetStringLoop{abday#1name}{lu,ma,mi,ju,vi,sa,do}
\end{verbatim}
|#1| is replaced by the roman numeral.

\Describe\SetCase{\oarg{map-list}\marg{toupper-code}\marg{tolower-code}}
Sets globally code to be executed at |\MakeUppercase| and
|\MakeLowercase|. The code would typically be things like |\let\BB\bb|
and |\uccode| or |\lccode| (although for the reasons explained above,
changes in lc/uc codes may not work). A \meta{map-list} is a series of
macros using the internal format of |\@uclclist| (eg,
|\bb\BB\cc\CC|). The mandatory arguments take precedence over the
optional one. This command, unlike |\SetString|, is executed always
(even without |strings|), and it is intended for minor readjustments
only.

For example, as |T1| is the default case mapping in \LaTeX, we can
set for Turkish:
\begin{verbatim}
\StartBabelCommands{turkish}{}[ot1enc, fontenc=OT1]
\SetCase
  {\uccode"10=`I\relax}
  {\lccode`I="10\relax}

\StartBabelCommands{turkish}{}[unicode, fontenc=TU EU1 EU2, charset=utf8]
\SetCase
  {\uccode`i=`İ\relax
   \uccode`ı=`I\relax}
  {\lccode`İ=`i\relax
   \lccode`I=`ı\relax}

\StartBabelCommands{turkish}{}
\SetCase
  {\uccode`i="9D\relax
   \uccode"19=`I\relax}
  {\lccode"9D=`i\relax
   \lccode`I="19\relax}

\EndBabelCommands
\end{verbatim}
(Note the mapping for |OT1| is not complete.)

\Describe{\SetHyphenMap}{\marg{to-lower-macros}}
\New{3.9g} Case mapping serves in \TeX{} for two unrelated purposes: case
transforms (upper/lower) and hyphenation. |\SetCase| handles the
former, while hyphenation is handled by |\SetHyphenMap| and controlled
with the package option |hyphenmap|. So, even if internally they are based
on the same \TeX{} primitive (|\lccode|), \babel{} sets them separately.

There are three helper macros to
be used inside |\SetHyphenMap|:
\begin{itemize}
\item |\BabelLower|\marg{uccode}\marg{lccode} is
  similar to |\lccode| but it's ignored if the char has been set and
  saves the original lccode to restore it when switching the language
  (except with |hyphenmap=first|).
\item |\BabelLowerMM|\marg{uccode-from}\marg{uccode-to}%
  \marg{step}\marg{lccode-from} loops though the given uppercase
  codes, using the step, and assigns them the lccode, which is also
  increased (|MM| stands for \textit{many-to-many}).
\item |\BabelLowerMO|\marg{uccode-from}\marg{uccode-to}%
  \marg{step}\marg{lccode} loops though the given uppercase
  codes, using the step, and assigns them the lccode, which is fixed
  (|MO| stands for \textit{many-to-one}).
\end{itemize}
An example is (which is redundant, because these assignments are done
by both \luatex{} and \xetex{}):
\begin{verbatim}
\SetHyphenMap{\BabelLowerMM{"100}{"11F}{2}{"101}}
\end{verbatim}

This macro is not intended to fix wrong mappings done by Unicode
(which are the default in both \xetex{} and \luatex{}) -- if an
assignment is wrong, fix it directly.

\section{Changes}

\subsection{Changes in \babel\ version 3.9}

Most of the changes in version 3.9 were related to bugs, either to fix them
(there were lots), or to provide some alternatives. Even new features
like |\babelhyphen| are intended to solve a certain problem (in this
case, the lacking of a uniform syntax and behavior for shorthands
across languages). These changes are described in this manual in the
corresponding place. A selective list follows:
\begin{itemize}
\item |\select@language| did not set |\languagename|. This meant the
  language in force when auxiliary files were loaded was the one used
  in, for example, shorthands -- if the language was |german|, a
  |\select@language{spanish}| had no effect.

\item |\foreignlanguage| and |otherlanguage*| messed up
  |\extras<language>|. Scripts, encodings and many other things were
  not switched correctly.

\item The |:ENC| mechanism for hyphenation patterns used the encoding
  of the \textit{previous} language, not that of the language being
  selected.

\item |'| (with |activeacute|) had the original value when writing to an
  auxiliary file, and things like an infinite loop can happen. It
  worked incorrectly with |^| (if activated) and also if deactivated.

\item Active chars where not reset at the end of language options, and
  that lead to incompatibilities between languages.

\item |\textormath| raised and error with a conditional.

\item |\aliasshorthand| didn't work (or only in a few and very specific
  cases).

\item |\l@english| was defined incorrectly (using |\let| instead of
  |\chardef|).

\item |ldf| files not bundled with babel were not recognized when
  called as global options.
\end{itemize}

\DocInput{babel.dtx}

\section{Acknowledgements}

I would like to thank all who volunteered as $\beta$-testers for their
time. Michel Goossens supplied contributions for most of the other
languages.  Nico Poppelier helped polish the text of the documentation
and supplied parts of the macros for the Dutch language.  Paul Wackers
and Werenfried Spit helped find and repair bugs.

During the further development of the babel system I received much
help from Bernd Raichle, for which I am grateful.

\begin{thebibliography}{9}
 \bibitem{AT} Huda Smitshuijzen Abifares, \textit{Arabic Typography},
   Saqi, 2001.
 \bibitem{BEP} Johannes Braams, Victor Eijkhout and Nico Poppelier,
   \emph{The development of national \LaTeX\ styles},
   \emph{TUGboat} 10 (1989) \#3, p.~401--406.
 \bibitem{FE} Yannis Haralambous,
   \emph{Fonts \& Encodings}, O'Reilly, 2007.
 \bibitem{DEK} Donald E. Knuth,
   \emph{The \TeX book}, Addison-Wesley, 1986.
 \bibitem{UE} Jukka K. Korpela,
   \textit{Unicode Explained}, O'Reilly, 2006.
 \bibitem{LLbook} Leslie Lamport,
    \emph{\LaTeX, A document preparation System}, Addison-Wesley,
    1986.
 \bibitem{LLth} Leslie Lamport,
    in: \TeX hax Digest, Volume 89, \#13, 17 February 1989.
 \bibitem{CJKV} Ken Lunde,
   \textit{CJKV Information Processing}, O'Reilly, 2nd ed., 2009.
 \bibitem{HP} Hubert Partl,
   \emph{German \TeX},
   \emph{TUGboat} 9 (1988) \#1, p.~70--72.
 \bibitem{ilatex} Joachim Schrod,
   \emph{International \LaTeX\ is ready to use},
   \emph{TUGboat} 11 (1990) \#1, p.~87--90.
 \bibitem{STS} Apostolos Syropoulos, Antonis Tsolomitis and Nick
   Sofroniu,
   \emph{Digital typography using \LaTeX},
   Springer, 2002, p.~301--373.
 \bibitem{treebus} K.F. Treebus.
    \emph{Tekstwijzer, een gids voor het grafisch verwerken van
    tekst},
    SDU Uitgeverij ('s-Gravenhage, 1988).
\end{thebibliography}
\end{document}
%</filedriver>
%
% \fi
%
%\begingroup
%  \catcode`<=\active%
%  \catcode`>=\active
%  \makeatletter
%  \gdef\MakePrivateLetters{%
%    \catcode`@=11\relax
%    \gdef<##1{\ifx##1@$\langle\langle$\bgroup\itshape\rmfamily
%      \expandafter\bblref
%      \else\string<##1\fi}%
%    \gdef\bblref##1@>{##1\/\egroup$\rangle\rangle$}}%
%  \global\let\check@percent\saved@check@percent
%\endgroup
%
% \part{Source code}
%
% \small
%
% \babel{} is being developed incrementally, which means parts of the
% code are under development and therefore incomplete. Only documented
% features are considered complete. In other words, use \babel{} only
% as documented (except, of course, if you want to explore and test
% them -- you can post suggestions about multilingual issues to
% |kadingira@tug.org| on |http://tug.org/mailman/listinfo/kadingira|).
%
% \section{Identification and loading of required files}
%
% \textit{Code documentation is still under revision.}
%
% \textbf{The following description is no longer valid, because switch
% and plain have been merged into babel.def.}
%
% The \babel{} package after unpacking consists of the following files:
% \begin{description}
% \itemsep=-\parskip
% \item[switch.def] defines macros to set and switch languages.
% \item[babel.def] defines the rest of macros. It has tow parts: a
%   generic one and a second one only for LaTeX{}.
% \item[babel.sty] is the \LaTeX{} package, which set options and
%   load language styles.
% \item[plain.def] defines some \LaTeX{} macros required by
%   \file{babel.def} and provides a few tools for Plain.
% \item[hyphen.cfg] is the file to be used when generating the
%   formats to load hyphenation patterns.
% \end{description}
%
% The \babel{} installer extends \textsf{docstrip} with a few
% ``pseudo-guards'' to set ``variables'' used at installation time.
% They are used with |<||@name@>| at the appropiated places in the
% source code and shown below with
% $\langle\langle$\textit{name}$\rangle\rangle$. That brings a little
% bit of literate programming.
%
% \section{\texttt{locale} directory}
%
% A required component of \babel{} is a set of |ini| files
% with basic definitions for about 200 languages. They are distributed
% as a separate |zip| file, not packed as |dtx|. With them, babel
% will fully support Unicode engines.

% Most of them are essentially finished (except bugs and mistakes, of
% course). Some of them are still incomplete (but they will be usable),
% and there are some omissions (eg, Latin and polytonic Greek, and
% there are no geographic areas in Spanish). Hindi, French, Occitan and
% Breton will show a warning related to dates. Not all include LICR
% variants.
%
% This is a preliminary documentation.
%
% |ini| files contain the actual data; |tex| files are currently just
% proxies to the corresponding ini files.
%
% Most keys are self-explanatory.
% \begin{description}
% \itemsep=-\parskip
% \item[charset] the encoding used in the ini file.
% \item[version] of the ini file
% \item[level] ``version'' of the ini specification . which keys are
%   available (they may grow in a compatible way) and how they should be
%   read.
% \item[encodings] a descriptive list of font encondings.
% \item[{[captions]}] section of captions in the file charset
% \item[{[captions.licr]}] same, but in pure ASCII using the LICR
% \item[date.long] fields are as in the CLDR, but the syntax is
%   different. Anything inside brackets is a date field (eg, |MMMM| for
%   the month name) and anything outside is text. In addition, |[ ]| is a
%   non breakable space and |[.]| is an abbreviation dot.
% \end{description}
%
% Keys may be further qualified in a particular language with a suffix
% starting with a uppercase letter. It can be just a letter (eg,
% |babel.name.A|, |babel.name.B|) or a name (eg,
% |date.long.Nominative|, |date.long.Formal|, but no language is
% currently using the latter). \textit{Multi-letter} qualifiers are
% forward compatible in the sense they won’t conflict with new
% ``global'' keys (which start always with a lowercase case). There is
% an exception, however: the section |counters| has been devised to
% have arbitrary keys, so you can add lowercased keys if you want.
%
% \section{Tools}
%
%    \begin{macrocode}
%<<version=3.61>>
%<<date=2021/06/28>>
%    \end{macrocode}
%
% \textbf{Do not use the following macros in \texttt{ldf} files. They
% may change in the future}. This applies mainly to those recently
% added for replacing, trimming and looping. The older ones, like
% |\bbl@afterfi|, will not change.
%
% We define some basic macros which just make the code cleaner.
% |\bbl@add| is now used internally instead of |\addto| because of
% the unpredictable behavior of the latter. Used in
% \file{babel.def} and in \file{babel.sty}, which means in \LaTeX{}
% is executed twice, but we need them when defining options and
% \file{babel.def} cannot be load until options have been defined.
% This does not hurt, but should be fixed somehow.
%
%    \begin{macrocode}
%<<*Basic macros>>
\bbl@trace{Basic macros}
\def\bbl@stripslash{\expandafter\@gobble\string}
\def\bbl@add#1#2{%
  \bbl@ifunset{\bbl@stripslash#1}%
    {\def#1{#2}}%
    {\expandafter\def\expandafter#1\expandafter{#1#2}}}
\def\bbl@xin@{\@expandtwoargs\in@}
\def\bbl@csarg#1#2{\expandafter#1\csname bbl@#2\endcsname}%
\def\bbl@cs#1{\csname bbl@#1\endcsname}
\def\bbl@cl#1{\csname bbl@#1@\languagename\endcsname}
\def\bbl@loop#1#2#3{\bbl@@loop#1{#3}#2,\@nnil,}
\def\bbl@loopx#1#2{\expandafter\bbl@loop\expandafter#1\expandafter{#2}}
\def\bbl@@loop#1#2#3,{%
  \ifx\@nnil#3\relax\else
    \def#1{#3}#2\bbl@afterfi\bbl@@loop#1{#2}%
  \fi}
\def\bbl@for#1#2#3{\bbl@loopx#1{#2}{\ifx#1\@empty\else#3\fi}}
%    \end{macrocode}
%
%  \begin{macro}{\bbl@add@list}
%    This internal macro adds its second argument to a comma
%    separated list in its first argument. When the list is not
%    defined yet (or empty), it will be initiated. It presumes
%    expandable character strings.
%
%    \begin{macrocode}
\def\bbl@add@list#1#2{%
  \edef#1{%
    \bbl@ifunset{\bbl@stripslash#1}%
      {}%
      {\ifx#1\@empty\else#1,\fi}%
    #2}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@afterelse}
%  \begin{macro}{\bbl@afterfi}
%    Because the code that is used in the handling of active
%    characters may need to look ahead, we take extra care to `throw'
%    it over the |\else| and |\fi| parts of an
%    |\if|-statement\footnote{This code is based on code presented in
%    TUGboat vol. 12, no2, June 1991 in ``An expansion Power Lemma''
%    by Sonja Maus.}. These macros will break if another |\if...\fi|
%    statement appears in one of the arguments and it is not enclosed
%    in braces.
%
%    \begin{macrocode}
\long\def\bbl@afterelse#1\else#2\fi{\fi#1}
\long\def\bbl@afterfi#1\fi{\fi#1}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\bbl@exp}
%
%   Now, just syntactical sugar, but it makes partial expansion of
%   some code a lot more simple and readable. Here |\\| stands for
%   |\noexpand| and |\<..>| for |\noexpand| applied to a built macro
%   name (the latter does not define the macro if undefined to
%   |\relax|, because it is created locally). The result may be
%   followed by extra arguments, if necessary.
%
%    \begin{macrocode}
\def\bbl@exp#1{%
  \begingroup
    \let\\\noexpand
    \def\<##1>{\expandafter\noexpand\csname##1\endcsname}%
    \edef\bbl@exp@aux{\endgroup#1}%
  \bbl@exp@aux}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bbl@trim}
%   The following piece of code is stolen (with some changes) from
%   \textsf{keyval}, by David Carlisle. It defines two macros:
%   |\bbl@trim| and |\bbl@trim@def|. The first one strips the leading
%   and trailing spaces from the second argument and then applies the
%   first argument (a macro, |\toks@| and the like). The second one,
%   as its name suggests, defines the first argument as the stripped
%   second argument.
%
%    \begin{macrocode}
\def\bbl@tempa#1{%
  \long\def\bbl@trim##1##2{%
    \futurelet\bbl@trim@a\bbl@trim@c##2\@nil\@nil#1\@nil\relax{##1}}%
  \def\bbl@trim@c{%
    \ifx\bbl@trim@a\@sptoken
      \expandafter\bbl@trim@b
    \else
      \expandafter\bbl@trim@b\expandafter#1%
    \fi}%
  \long\def\bbl@trim@b#1##1 \@nil{\bbl@trim@i##1}}
\bbl@tempa{ }
\long\def\bbl@trim@i#1\@nil#2\relax#3{#3{#1}}
\long\def\bbl@trim@def#1{\bbl@trim{\def#1}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bbl@ifunset}
%   To check if a macro is defined, we create a new macro, which does
%   the same as |\@ifundefined|. However, in an $\epsilon$-tex engine,
%   it is based on |\ifcsname|, which is more efficient, and do not
%   waste memory.
%
%    \begin{macrocode}
\begingroup
  \gdef\bbl@ifunset#1{%
    \expandafter\ifx\csname#1\endcsname\relax
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi}
  \bbl@ifunset{ifcsname}%
    {}%
    {\gdef\bbl@ifunset#1{%
       \ifcsname#1\endcsname
         \expandafter\ifx\csname#1\endcsname\relax
           \bbl@afterelse\expandafter\@firstoftwo
         \else
           \bbl@afterfi\expandafter\@secondoftwo
         \fi
       \else
         \expandafter\@firstoftwo
       \fi}}
\endgroup
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bbl@ifblank}
%   A tool from \textsf{url}, by Donald Arseneau, which tests if a
%   string is empty or space. The companion macros tests if a macro is
%   defined with some `real' value, ie, not |\relax| and not empty,
%
%    \begin{macrocode}
\def\bbl@ifblank#1{%
  \bbl@ifblank@i#1\@nil\@nil\@secondoftwo\@firstoftwo\@nil}
\long\def\bbl@ifblank@i#1#2\@nil#3#4#5\@nil{#4}
\def\bbl@ifset#1#2#3{% 
  \bbl@ifunset{#1}{#3}{\bbl@exp{\\\bbl@ifblank{#1}}{#3}{#2}}}
%    \end{macrocode}
% \end{macro}
%
% For each element in the comma separated <key>|=|<value> list,
% execute <code> with |#1| and |#2| as the key and the value of
% current item (trimmed). In addition, the item is passed verbatim as
% |#3|. With the <key> alone, it passes |\@empty| (ie, the macro thus
% named, not an empty argument, which is what you get with <key>|=|
% and no value).
%
%    \begin{macrocode}
\def\bbl@forkv#1#2{%
  \def\bbl@kvcmd##1##2##3{#2}%
  \bbl@kvnext#1,\@nil,}
\def\bbl@kvnext#1,{%
  \ifx\@nil#1\relax\else
    \bbl@ifblank{#1}{}{\bbl@forkv@eq#1=\@empty=\@nil{#1}}%
    \expandafter\bbl@kvnext
  \fi}
\def\bbl@forkv@eq#1=#2=#3\@nil#4{%
  \bbl@trim@def\bbl@forkv@a{#1}%
  \bbl@trim{\expandafter\bbl@kvcmd\expandafter{\bbl@forkv@a}}{#2}{#4}}
%    \end{macrocode}
%
% A \textit{for} loop. Each item (trimmed), is |#1|.  It cannot be
% nested (it's doable, but we don't need it).
%
%    \begin{macrocode}
\def\bbl@vforeach#1#2{%
  \def\bbl@forcmd##1{#2}%
  \bbl@fornext#1,\@nil,}
\def\bbl@fornext#1,{%
  \ifx\@nil#1\relax\else
    \bbl@ifblank{#1}{}{\bbl@trim\bbl@forcmd{#1}}%
    \expandafter\bbl@fornext
  \fi}
\def\bbl@foreach#1{\expandafter\bbl@vforeach\expandafter{#1}}
%    \end{macrocode}
%
% \begin{macro}{\bbl@replace}
%
%    \begin{macrocode}
\def\bbl@replace#1#2#3{% in #1 -> repl #2 by #3
  \toks@{}%
  \def\bbl@replace@aux##1#2##2#2{%
    \ifx\bbl@nil##2%
      \toks@\expandafter{\the\toks@##1}%
    \else
      \toks@\expandafter{\the\toks@##1#3}%
      \bbl@afterfi
      \bbl@replace@aux##2#2%
    \fi}%
  \expandafter\bbl@replace@aux#1#2\bbl@nil#2%
  \edef#1{\the\toks@}}
%    \end{macrocode}
%
% An extensison to the previous macro. It takes into account the
% parameters, and it is string based (ie, if you replace |elax| by
% |ho|, then |\relax| becomes |\rho|). No checking is done at all,
% because it is not a general purpose macro, and it is used by \babel{}
% only when it works (an example where it does \textit{not} work is in
% |\bbl@TG@@date|, and also fails if there are macros with spaces,
% because they are retokenized). It may change! (or even merged with
% |\bbl@replace|; I'm not sure ckecking the replacement is really
% necessary or just paranoia).
% 
%    \begin{macrocode}
\ifx\detokenize\@undefined\else % Unused macros if old Plain TeX
  \bbl@exp{\def\\\bbl@parsedef##1\detokenize{macro:}}#2->#3\relax{%
    \def\bbl@tempa{#1}%
    \def\bbl@tempb{#2}%
    \def\bbl@tempe{#3}}
  \def\bbl@sreplace#1#2#3{%
    \begingroup
      \expandafter\bbl@parsedef\meaning#1\relax
      \def\bbl@tempc{#2}%
      \edef\bbl@tempc{\expandafter\strip@prefix\meaning\bbl@tempc}%
      \def\bbl@tempd{#3}%
      \edef\bbl@tempd{\expandafter\strip@prefix\meaning\bbl@tempd}%
      \bbl@xin@{\bbl@tempc}{\bbl@tempe}% If not in macro, do nothing
      \ifin@
        \bbl@exp{\\\bbl@replace\\\bbl@tempe{\bbl@tempc}{\bbl@tempd}}%
        \def\bbl@tempc{%     Expanded an executed below as 'uplevel'
           \\\makeatletter % "internal" macros with @ are assumed
           \\\scantokens{%
             \bbl@tempa\\\@namedef{\bbl@stripslash#1}\bbl@tempb{\bbl@tempe}}%
           \catcode64=\the\catcode64\relax}%  Restore @
      \else
        \let\bbl@tempc\@empty  % Not \relax
      \fi
      \bbl@exp{%      For the 'uplevel' assignments
    \endgroup
      \bbl@tempc}}  % empty or expand to set #1 with changes 
\fi
%    \end{macrocode}
% \end{macro}
%
% Two further tools.  |\bbl@samestring| first expand its arguments and
% then compare their expansion (sanitized, so that the catcodes do not
% matter). |\bbl@engine| takes the following values: 0 is pdf\TeX, 1
% is \luatex, and 2 is \xetex. You may use the latter it in your
% language style if you want.
%
%    \begin{macrocode}
\def\bbl@ifsamestring#1#2{%
  \begingroup
    \protected@edef\bbl@tempb{#1}%
    \edef\bbl@tempb{\expandafter\strip@prefix\meaning\bbl@tempb}%
    \protected@edef\bbl@tempc{#2}%
    \edef\bbl@tempc{\expandafter\strip@prefix\meaning\bbl@tempc}%
    \ifx\bbl@tempb\bbl@tempc
      \aftergroup\@firstoftwo
    \else
      \aftergroup\@secondoftwo
    \fi
  \endgroup}
\chardef\bbl@engine=%
  \ifx\directlua\@undefined
    \ifx\XeTeXinputencoding\@undefined
      \z@
    \else
      \tw@
    \fi
  \else
    \@ne
  \fi
%    \end{macrocode}
%
% A somewhat hackish tool (hence its name) to avoid spurious spaces in
% some contexts.
%
%    \begin{macrocode}
\def\bbl@bsphack{%
  \ifhmode
    \hskip\z@skip
    \def\bbl@esphack{\loop\ifdim\lastskip>\z@\unskip\repeat\unskip}%
  \else
    \let\bbl@esphack\@empty
  \fi}
%    \end{macrocode}
%
% Another hackish tool, to apply case changes inside a protected
% macros. It's based on the internal |\let|'s made by |\MakeUppercase|
% and |\MakeLowercase| between things like |\oe| and |\OE|.
%
%    \begin{macrocode}
\def\bbl@cased{%
  \ifx\oe\OE
    \expandafter\in@\expandafter
      {\expandafter\OE\expandafter}\expandafter{\oe}%
    \ifin@
      \bbl@afterelse\expandafter\MakeUppercase
    \else  
      \bbl@afterfi\expandafter\MakeLowercase
    \fi  
  \else
    \expandafter\@firstofone
  \fi}
%    \end{macrocode}
%
% The following adds some code to |\extras...| both before and after,
% while avoiding doing it twice. It's somewhat convoluted, to deal with
% |#|'s.
%
%    \begin{macrocode}  
\def\bbl@extras@wrap#1#2#3{% 1:in-test, 2:before, 3:after
  \toks@\expandafter\expandafter\expandafter{%
    \csname extras\languagename\endcsname}%
  \bbl@exp{\\\in@{#1}{\the\toks@}}%
  \ifin@\else
    \@temptokena{#2}%
    \edef\bbl@tempc{\the\@temptokena\the\toks@}%
    \toks@\expandafter{\bbl@tempc#3}%
    \expandafter\edef\csname extras\languagename\endcsname{\the\toks@}%
  \fi}
%<</Basic macros>>
%    \end{macrocode}
%
% Some files identify themselves with a \LaTeX{} macro. The following
% code is placed before them to define (and then undefine) if not in
% \LaTeX.
%
%    \begin{macrocode}
%<<*Make sure ProvidesFile is defined>>
\ifx\ProvidesFile\@undefined
  \def\ProvidesFile#1[#2 #3 #4]{%
    \wlog{File: #1 #4 #3 <#2>}%
    \let\ProvidesFile\@undefined}
\fi
%<</Make sure ProvidesFile is defined>>
%    \end{macrocode}
%
% \subsection{Multiple languages}
%
% \begin{macro}{\language}
%
% Plain \TeX\ version~3.0 provides the primitive |\language| that
% is used to store the current language. When used with a pre-3.0
% version this function has to be implemented by allocating a
% counter. The following block is used in \file{switch.def} and
% \file{hyphen.cfg}; the latter may seem redundant, but remember
% \babel{} doesn't requires loading \file{switch.def} in the format.
%
%    \begin{macrocode}
%<<*Define core switching macros>>
\ifx\language\@undefined
  \csname newcount\endcsname\language
\fi
%<</Define core switching macros>>
%    \end{macrocode}
%
% \end{macro}
%
% \begin{macro}{\last@language}
%
% Another counter is used to store the last language defined.  For
% pre-3.0 formats an extra counter has to be allocated.
%
% \begin{macro}{\addlanguage}
%
% This macro was introduced for \TeX{} $<$ 2. Preserved for
% compatibility.
%
%    \begin{macrocode}
%<<*Define core switching macros>>
%<<*Define core switching macros>>
\countdef\last@language=19  % TODO. why? remove?
\def\addlanguage{\csname newlanguage\endcsname}
%<</Define core switching macros>>
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%    Now we make sure all required files are loaded.  When the command
%    |\AtBeginDocument| doesn't exist we assume that we are dealing
%    with a plain-based format or \LaTeX2.09. In that case the file
%    \file{plain.def} is needed (which also defines
%    |\AtBeginDocument|, and therefore it is not loaded twice). We
%    need the first part when the format is created, and |\orig@dump|
%    is used as a flag. Otherwise, we need to use the second part, so
%    |\orig@dump| is not defined (\file{plain.def} undefines it).
%
%    Check if the current version of \file{switch.def} has been
%    previously loaded (mainly, \file{hyphen.cfg}). If not, load it
%    now. We cannot load |babel.def| here because we first need to
%    declare and process the package options.
%
%
% \subsection{The Package File (\LaTeX, \texttt{babel.sty})}
%
% This file also takes care of a number of compatibility issues with
% other packages an defines a few aditional package options. Apart from
% all the language options below we also have a few options that
% influence the behavior of language definition files.
%
% Many of the following options don't do anything themselves, they are
% just defined in order to make it possible for babel and language
% definition files to check if one of them was specified by the user.
%
% The first two options are for debugging.
%
%    \begin{macrocode}
%<*package>
\NeedsTeXFormat{LaTeX2e}[2005/12/01]
\ProvidesPackage{babel}[<@date@> <@version@> The Babel package]
\@ifpackagewith{babel}{debug}
  {\providecommand\bbl@trace[1]{\message{^^J[ #1 ]}}%
   \let\bbl@debug\@firstofone
   \ifx\directlua\@undefined\else
     \directlua{ Babel = Babel or {}
       Babel.debug = true }%
   \fi}
  {\providecommand\bbl@trace[1]{}%
   \let\bbl@debug\@gobble
   \ifx\directlua\@undefined\else
     \directlua{ Babel = Babel or {}
       Babel.debug = false }%
   \fi}
<@Basic macros@>
  % Temporarily repeat here the code for errors. TODO.
  \def\bbl@error#1#2{%
    \begingroup
      \def\\{\MessageBreak}%
      \PackageError{babel}{#1}{#2}%
    \endgroup}
  \def\bbl@warning#1{%
    \begingroup
      \def\\{\MessageBreak}%
      \PackageWarning{babel}{#1}%
    \endgroup}
  \def\bbl@infowarn#1{%
    \begingroup
      \def\\{\MessageBreak}%
      \GenericWarning
        {(babel) \@spaces\@spaces\@spaces}%
        {Package babel Info: #1}%
    \endgroup}
  \def\bbl@info#1{%
    \begingroup
      \def\\{\MessageBreak}%
      \PackageInfo{babel}{#1}%
    \endgroup}
\def\bbl@nocaption{\protect\bbl@nocaption@i}
% TODO - Wrong for \today !!! Must be a separate macro.
\def\bbl@nocaption@i#1#2{% 1: text to be printed 2: caption macro \langXname
  \global\@namedef{#2}{\textbf{?#1?}}%
  \@nameuse{#2}%
  \edef\bbl@tempa{#1}%
  \bbl@sreplace\bbl@tempa{name}{}%
  \bbl@warning{%
    \@backslashchar#1 not set for '\languagename'. Please,\\%
    define it after the language has been loaded\\%
    (typically in the preamble) with\\% 
    \string\setlocalecaption{\languagename}{\bbl@tempa}{..}\\%
    Reported}}
\def\bbl@tentative{\protect\bbl@tentative@i}
\def\bbl@tentative@i#1{%
  \bbl@warning{%
    Some functions for '#1' are tentative.\\%
    They might not work as expected and their behavior\\%
    may change in the future.\\%
    Reported}}
\def\@nolanerr#1{%
  \bbl@error
    {You haven't defined the language '#1' yet.\\%
     Perhaps you misspelled it or your installation\\%
     is not complete}%
    {Your command will be ignored, type <return> to proceed}}
\def\@nopatterns#1{%
  \bbl@warning
    {No hyphenation patterns were preloaded for\\%
     the language '#1' into the format.\\%
     Please, configure your TeX system to add them and\\%
     rebuild the format. Now I will use the patterns\\%
     preloaded for \bbl@nulllanguage\space instead}}
    % End of errors
\@ifpackagewith{babel}{silent}
  {\let\bbl@info\@gobble
   \let\bbl@infowarn\@gobble
   \let\bbl@warning\@gobble}
  {}
%
\def\AfterBabelLanguage#1{%
  \global\expandafter\bbl@add\csname#1.ldf-h@@k\endcsname}%
%    \end{macrocode}
%
% If the format created a list of loaded languages (in
% |\bbl@languages|), get the name of the 0-th to show the actual
% language used. Also avaliable with |base|, because it just shows
% info.
%
%    \begin{macrocode}
\ifx\bbl@languages\@undefined\else
  \begingroup
    \catcode`\^^I=12
    \@ifpackagewith{babel}{showlanguages}{%
      \begingroup
        \def\bbl@elt#1#2#3#4{\wlog{#2^^I#1^^I#3^^I#4}}%
        \wlog{<*languages>}%
        \bbl@languages
        \wlog{</languages>}%
      \endgroup}{}
  \endgroup
  \def\bbl@elt#1#2#3#4{%
    \ifnum#2=\z@
      \gdef\bbl@nulllanguage{#1}%
      \def\bbl@elt##1##2##3##4{}%
    \fi}%
  \bbl@languages
\fi%
%    \end{macrocode}
% \subsection{\texttt{base}}
%
% The first `real' option to be processed is |base|, which set the
% hyphenation patterns then resets |ver@babel.sty| so that \LaTeX
% forgets about the first loading. After a subset of |babel.def| has
% been loaded (the old |switch.def|) and |\AfterBabelLanguage| defined,
% it exits.
%
% Now the \texttt{base} option. With it we can define (and load, with
% \luatex) hyphenation patterns, even if we are not interesed in the
% rest of babel.
%
%    \begin{macrocode}
\bbl@trace{Defining option 'base'}
\@ifpackagewith{babel}{base}{%
  \let\bbl@onlyswitch\@empty
  \let\bbl@provide@locale\relax
  \input babel.def
  \let\bbl@onlyswitch\@undefined
  \ifx\directlua\@undefined
    \DeclareOption*{\bbl@patterns{\CurrentOption}}%
  \else
    \input luababel.def
    \DeclareOption*{\bbl@patterns@lua{\CurrentOption}}%
  \fi
  \DeclareOption{base}{}%
  \DeclareOption{showlanguages}{}%
  \ProcessOptions
  \global\expandafter\let\csname opt@babel.sty\endcsname\relax
  \global\expandafter\let\csname ver@babel.sty\endcsname\relax
  \global\let\@ifl@ter@@\@ifl@ter
  \def\@ifl@ter#1#2#3#4#5{\global\let\@ifl@ter\@ifl@ter@@}%
  \endinput}{}%
% \end{macrocode}
%
% \subsection{\texttt{key=value} options and other general option}
%
%    The following macros extract language modifiers, and only real
%    package options are kept in the option list. Modifiers are saved
%    and assigned to |\BabelModifiers| at |\bbl@load@language|; when
%    no modifiers have been given, the former is |\relax|. How
%    modifiers are handled are left to language styles; they can use
%    |\in@|, loop them with |\@for| or load |keyval|, for example.
%
%    \begin{macrocode}
\bbl@trace{key=value and another general options}
\bbl@csarg\let{tempa\expandafter}\csname opt@babel.sty\endcsname
\def\bbl@tempb#1.#2{%  Remove trailing dot
   #1\ifx\@empty#2\else,\bbl@afterfi\bbl@tempb#2\fi}%
\def\bbl@tempd#1.#2\@nnil{%  TODO. Refactor lists?
  \ifx\@empty#2%
    \edef\bbl@tempc{\ifx\bbl@tempc\@empty\else\bbl@tempc,\fi#1}%
  \else
    \in@{,provide=}{,#1}%
    \ifin@
      \edef\bbl@tempc{%
        \ifx\bbl@tempc\@empty\else\bbl@tempc,\fi#1.\bbl@tempb#2}%
    \else
      \in@{=}{#1}%
      \ifin@
        \edef\bbl@tempc{\ifx\bbl@tempc\@empty\else\bbl@tempc,\fi#1.#2}%
      \else    
        \edef\bbl@tempc{\ifx\bbl@tempc\@empty\else\bbl@tempc,\fi#1}%
        \bbl@csarg\edef{mod@#1}{\bbl@tempb#2}%
      \fi
    \fi
  \fi}
\let\bbl@tempc\@empty
\bbl@foreach\bbl@tempa{\bbl@tempd#1.\@empty\@nnil}
\expandafter\let\csname opt@babel.sty\endcsname\bbl@tempc
%    \end{macrocode}
%
% The next option tells \babel{} to leave shorthand characters active
% at the end of processing the package. This is \emph{not} the default
% as it can cause problems with other packages, but for those who want
% to use the shorthand characters in the preamble of their documents
% this can help.
%
%    \begin{macrocode}
\DeclareOption{KeepShorthandsActive}{}
\DeclareOption{activeacute}{}
\DeclareOption{activegrave}{}
\DeclareOption{debug}{}
\DeclareOption{noconfigs}{}
\DeclareOption{showlanguages}{}
\DeclareOption{silent}{}
% \DeclareOption{mono}{}
\DeclareOption{shorthands=off}{\bbl@tempa shorthands=\bbl@tempa}
\chardef\bbl@iniflag\z@
\DeclareOption{provide=*}{\chardef\bbl@iniflag\@ne}    % main -> +1
\DeclareOption{provide+=*}{\chardef\bbl@iniflag\tw@}   % add = 2
\DeclareOption{provide*=*}{\chardef\bbl@iniflag\thr@@} % add + main
% A separate option
\let\bbl@autoload@options\@empty
\DeclareOption{provide@=*}{\def\bbl@autoload@options{import}}
% Don't use. Experimental. TODO.
\newif\ifbbl@single
\DeclareOption{selectors=off}{\bbl@singletrue}
<@More package options@>
%    \end{macrocode}
%
% Handling of package options is done in three passes. (I [JBL] am not
% very happy with the idea, anyway.) The first one processes options
% which has been declared above or follow the syntax |<key>=<value>|,
% the second one loads the requested languages, except the main one if
% set with the key |main|, and the third one loads the latter. First,
% we ``flag'' valid keys with a nil value.
%
%    \begin{macrocode}
\let\bbl@opt@shorthands\@nnil
\let\bbl@opt@config\@nnil
\let\bbl@opt@main\@nnil
\let\bbl@opt@headfoot\@nnil
\let\bbl@opt@layout\@nnil
\let\bbl@opt@provide\@nnil
%    \end{macrocode}
%
% The following tool is defined temporarily to store the values of
% options.
%
%    \begin{macrocode}
\def\bbl@tempa#1=#2\bbl@tempa{%
  \bbl@csarg\ifx{opt@#1}\@nnil
    \bbl@csarg\edef{opt@#1}{#2}%
  \else
    \bbl@error
     {Bad option '#1=#2'. Either you have misspelled the\\%
      key or there is a previous setting of '#1'. Valid\\%
      keys are, among others, 'shorthands', 'main', 'bidi',\\%
      'strings', 'config', 'headfoot', 'safe', 'math'.}%
     {See the manual for further details.}
  \fi}
%    \end{macrocode}
%
% Now the option list is processed, taking into account only currently
% declared options (including those declared with a |=|), and
% |<key>=<value>| options (the former take precedence).  Unrecognized
% options are saved in |\bbl@language@opts|, because they are language
% options.
%
%    \begin{macrocode}
\let\bbl@language@opts\@empty
\DeclareOption*{%
  \bbl@xin@{\string=}{\CurrentOption}%
  \ifin@
    \expandafter\bbl@tempa\CurrentOption\bbl@tempa
  \else
    \bbl@add@list\bbl@language@opts{\CurrentOption}%
  \fi}
%    \end{macrocode}
%
% Now we finish the first pass (and start over).
%
%    \begin{macrocode}
\ProcessOptions*
%    \end{macrocode}
%
%    \begin{macrocode}
\ifx\bbl@opt@provide\@nnil\else % Tests. Ignore.
  \chardef\bbl@iniflag\@ne
  \bbl@replace\bbl@opt@provide{;}{,}
  \bbl@add\bbl@opt@provide{,import}
  \show\bbl@opt@provide
\fi
% 
%    \end{macrocode}
%
% \subsection{Conditional loading of shorthands}
%
% If there is no |shorthands=<chars>|, the original \textsf{babel}
% macros are left untouched, but if there is, these macros are
% wrapped (in |babel.def|) to define only those given.
%
% A bit of optimization: if there is no |shorthands=|, then
% |\bbl@ifshorthand| is always true, and it is always false if
% |shorthands| is empty. Also, some code makes sense only with
% |shorthands=...|.
%
%    \begin{macrocode}
\bbl@trace{Conditional loading of shorthands}
\def\bbl@sh@string#1{%
  \ifx#1\@empty\else
    \ifx#1t\string~%
    \else\ifx#1c\string,%
    \else\string#1%
    \fi\fi
    \expandafter\bbl@sh@string
  \fi}
\ifx\bbl@opt@shorthands\@nnil
  \def\bbl@ifshorthand#1#2#3{#2}%
\else\ifx\bbl@opt@shorthands\@empty
  \def\bbl@ifshorthand#1#2#3{#3}%
\else
%    \end{macrocode}
%
%    The following macro tests if a shorthand is one of the allowed
%    ones.
%
%    \begin{macrocode}
  \def\bbl@ifshorthand#1{%
    \bbl@xin@{\string#1}{\bbl@opt@shorthands}%
    \ifin@
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi}
%    \end{macrocode}
%
% We make sure all chars in the string are `other', with the help
% of an auxiliary macro defined above (which also zaps spaces).
%
%    \begin{macrocode}
  \edef\bbl@opt@shorthands{%
    \expandafter\bbl@sh@string\bbl@opt@shorthands\@empty}%
%    \end{macrocode}
%
% The following is ignored with |shorthands=off|, since it is
% intended to take some aditional actions for certain chars.
%
%    \begin{macrocode}
  \bbl@ifshorthand{'}%
    {\PassOptionsToPackage{activeacute}{babel}}{}
  \bbl@ifshorthand{`}%
    {\PassOptionsToPackage{activegrave}{babel}}{}
\fi\fi
%    \end{macrocode}
%
% With |headfoot=lang| we can set the language used in heads/foots.
% For example, in babel/3796 just adds |headfoot=english|.  It
% misuses \cs{@resetactivechars} but seems to work.
%
%    \begin{macrocode}
\ifx\bbl@opt@headfoot\@nnil\else
  \g@addto@macro\@resetactivechars{%
    \set@typeset@protect
    \expandafter\select@language@x\expandafter{\bbl@opt@headfoot}%
    \let\protect\noexpand}
\fi
%    \end{macrocode}
%
% For the option safe we use a different approach -- |\bbl@opt@safe|
% says which macros are redefined (B for bibs and R for refs). By
% default, both are set.
%
%    \begin{macrocode}
\ifx\bbl@opt@safe\@undefined
  \def\bbl@opt@safe{BR}
\fi
\ifx\bbl@opt@main\@nnil\else
  \edef\bbl@language@opts{%
    \ifx\bbl@language@opts\@empty\else\bbl@language@opts,\fi
      \bbl@opt@main}
\fi
%    \end{macrocode}
%
% For |layout| an auxiliary macro is provided, available for packages
% and language styles. Optimization: if there is no |layout|, just do
% nothing.
%
%    \begin{macrocode}
\bbl@trace{Defining IfBabelLayout}
\ifx\bbl@opt@layout\@nnil
  \newcommand\IfBabelLayout[3]{#3}%
\else
  \newcommand\IfBabelLayout[1]{%
    \@expandtwoargs\in@{.#1.}{.\bbl@opt@layout.}%
    \ifin@
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi}
\fi
%    \end{macrocode}
%
% \textbf{Common definitions.} \textit{In progress.} Still based on
% |babel.def|, but the code should be moved here.
%
%    \begin{macrocode}
\input babel.def
%    \end{macrocode}
%
% \subsection{Cross referencing macros}
%
% The \LaTeX\ book states:
% \begin{quote}
%   The \emph{key} argument is any sequence of letters, digits, and
%   punctuation symbols; upper- and lowercase letters are regarded as
%   different.
% \end{quote}
% When the above quote should still be true when a document is
% typeset in a language that has active characters, special care
% has to be taken of the category codes of these characters when
% they appear in an argument of the cross referencing macros.
%
% When a cross referencing command processes its argument, all
% tokens in this argument should be character tokens with category
% `letter' or `other'.
%
% The following package options control which macros are to be
% redefined.
%
%    \begin{macrocode}
%<<*More package options>>
\DeclareOption{safe=none}{\let\bbl@opt@safe\@empty}
\DeclareOption{safe=bib}{\def\bbl@opt@safe{B}}
\DeclareOption{safe=ref}{\def\bbl@opt@safe{R}}
%<</More package options>>
%    \end{macrocode}
%
% \begin{macro}{\@newl@bel}
%
% First we open a new group to keep the changed setting of
% |\protect| local and then we set the |@safe@actives| switch to
% true to make sure that any shorthand that appears in any of the
% arguments immediately expands to its non-active self.
%
%    \begin{macrocode}
\bbl@trace{Cross referencing macros}
\ifx\bbl@opt@safe\@empty\else
  \def\@newl@bel#1#2#3{%
   {\@safe@activestrue
    \bbl@ifunset{#1@#2}%
       \relax
       {\gdef\@multiplelabels{%
          \@latex@warning@no@line{There were multiply-defined labels}}%
        \@latex@warning@no@line{Label `#2' multiply defined}}%
    \global\@namedef{#1@#2}{#3}}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\@testdef}
%
% An internal \LaTeX\ macro used to test if the labels that have
% been written on the |.aux| file have changed.  It is called by
% the |\enddocument| macro.
%
%    \begin{macrocode}
  \CheckCommand*\@testdef[3]{%
    \def\reserved@a{#3}%
    \expandafter\ifx\csname#1@#2\endcsname\reserved@a
    \else
      \@tempswatrue
    \fi}
%    \end{macrocode}
%
% Now that we made sure that |\@testdef| still has the same definition
% we can rewrite it. First we make the shorthands `safe'. Then we use
% |\bbl@tempa| as an `alias' for the macro that contains the label
% which is being checked. Then we define |\bbl@tempb| just as
% |\@newl@bel| does it. When the label is defined we replace the
% definition of |\bbl@tempa| by its meaning. If the label didn't
% change, |\bbl@tempa| and |\bbl@tempb| should be identical macros.
%
%    \begin{macrocode}
  \def\@testdef#1#2#3{%  TODO. With @samestring?
    \@safe@activestrue
    \expandafter\let\expandafter\bbl@tempa\csname #1@#2\endcsname
    \def\bbl@tempb{#3}%
    \@safe@activesfalse
    \ifx\bbl@tempa\relax
    \else
      \edef\bbl@tempa{\expandafter\strip@prefix\meaning\bbl@tempa}%
    \fi
    \edef\bbl@tempb{\expandafter\strip@prefix\meaning\bbl@tempb}%
    \ifx\bbl@tempa\bbl@tempb
    \else
      \@tempswatrue
    \fi}
\fi
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\ref}
% \begin{macro}{\pageref}
%
% The same holds for the macro |\ref| that references a label and
% |\pageref| to reference a page. We make them robust as well (if
% they weren't already) to prevent problems if they should become
% expanded at the wrong moment.
%
%    \begin{macrocode}
\bbl@xin@{R}\bbl@opt@safe
\ifin@
  \bbl@redefinerobust\ref#1{%
    \@safe@activestrue\org@ref{#1}\@safe@activesfalse}
  \bbl@redefinerobust\pageref#1{%
    \@safe@activestrue\org@pageref{#1}\@safe@activesfalse}
\else
  \let\org@ref\ref
  \let\org@pageref\pageref
\fi
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\@citex}
%
% The macro used to cite from a bibliography, |\cite|, uses an
% internal macro, |\@citex|.
% It is this internal macro that picks up the argument(s),
% so we redefine this internal macro and leave |\cite| alone. The
% first argument is used for typesetting, so the shorthands need
% only be deactivated in the second argument.
%
%    \begin{macrocode}
\bbl@xin@{B}\bbl@opt@safe
\ifin@
  \bbl@redefine\@citex[#1]#2{%
    \@safe@activestrue\edef\@tempa{#2}\@safe@activesfalse
    \org@@citex[#1]{\@tempa}}
%    \end{macrocode}
%
% Unfortunately, the packages \pkg{natbib} and \pkg{cite} need a
% different definition of |\@citex|...
% To begin with, \pkg{natbib} has a definition for |\@citex| with
% \emph{three} arguments... We only know that a package is loaded
% when |\begin{document}| is executed, so we need to postpone the
% different redefinition.
%
%    \begin{macrocode}
  \AtBeginDocument{%
    \@ifpackageloaded{natbib}{%
%    \end{macrocode}
%
% Notice that we use |\def| here instead of |\bbl@redefine| because
% |\org@@citex| is already defined and we don't want to overwrite
% that definition (it would result in parameter stack overflow
% because of a circular definition).
%
% (Recent versions of \pkg{natbib} change dynamically |\@citex|, so PR4087
% doesn't seem fixable in a simple way. Just load \pkg{natbib} before.)
%
%    \begin{macrocode}
    \def\@citex[#1][#2]#3{%
      \@safe@activestrue\edef\@tempa{#3}\@safe@activesfalse
      \org@@citex[#1][#2]{\@tempa}}%
    }{}}
%    \end{macrocode}
%
% The package \pkg{cite} has a definition of |\@citex| where the
% shorthands need to be turned off in both arguments.
%
%    \begin{macrocode}
  \AtBeginDocument{%
    \@ifpackageloaded{cite}{%
      \def\@citex[#1]#2{%
        \@safe@activestrue\org@@citex[#1]{#2}\@safe@activesfalse}%
      }{}}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\nocite}
%
% The macro |\nocite| which is used to instruct BiB\TeX\ to
% extract uncited references from the database.
%
%    \begin{macrocode}
  \bbl@redefine\nocite#1{%
    \@safe@activestrue\org@nocite{#1}\@safe@activesfalse}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\bibcite}
%
% The macro that is used in the |.aux| file to
% define citation labels. When packages such as \pkg{natbib} or
% \pkg{cite} are not loaded its second argument is used to typeset the
% citation label. In that case, this second argument can contain
% active characters but is used in an environment where
% |\@safe@activestrue| is in effect. This switch needs to be reset
% inside the |\hbox| which contains the citation label. In order to
% determine during \file{.aux} file processing which definition of
% |\bibcite| is needed we define |\bibcite| in such a way that it
% redefines itself with the proper definition. We call
% |\bbl@cite@choice| to select the proper definition for |\bibcite|.
% This new definition is then activated.
%
%    \begin{macrocode}
  \bbl@redefine\bibcite{%
    \bbl@cite@choice
    \bibcite}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\bbl@bibcite}
%
% The macro |\bbl@bibcite| holds the definition of |\bibcite|
% needed when neither \pkg{natbib} nor \pkg{cite} is loaded.
%
%    \begin{macrocode}
  \def\bbl@bibcite#1#2{%
    \org@bibcite{#1}{\@safe@activesfalse#2}}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\bbl@cite@choice}
%
% The macro |\bbl@cite@choice| determines which definition of
% |\bibcite| is needed. First we give |\bibcite| its default
% definition.
%
%    \begin{macrocode}
  \def\bbl@cite@choice{%
    \global\let\bibcite\bbl@bibcite
    \@ifpackageloaded{natbib}{\global\let\bibcite\org@bibcite}{}%
    \@ifpackageloaded{cite}{\global\let\bibcite\org@bibcite}{}%
    \global\let\bbl@cite@choice\relax}
%    \end{macrocode}
%
% When a document is run for the first time, no \file{.aux} file is
% available, and |\bibcite| will not yet be properly defined. In
% this case, this has to happen before the document starts.
%
%    \begin{macrocode}
  \AtBeginDocument{\bbl@cite@choice}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\@bibitem}
%
% One of the two internal \LaTeX\ macros called by |\bibitem|
% that write the citation label on the |.aux| file.
%
%    \begin{macrocode}
  \bbl@redefine\@bibitem#1{%
    \@safe@activestrue\org@@bibitem{#1}\@safe@activesfalse}
\else
  \let\org@nocite\nocite
  \let\org@@citex\@citex
  \let\org@bibcite\bibcite
  \let\org@@bibitem\@bibitem
\fi
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Marks}
%
% \begin{macro}{\markright}
% Because the output routine is asynchronous, we must pass the
% current language attribute to the head lines. To achieve this we
% need to adapt the definition of |\markright| and |\markboth|
% somewhat. However, headlines and footlines can contain text
% outside marks; for that we must take some actions in the output
% routine if the 'headfoot' options is used. 
%
% We need to make some redefinitions to the output routine
% to avoid an endless loop and to correctly handle the page number
% in bidi documents.
%
%    \begin{macrocode}
\bbl@trace{Marks}
\IfBabelLayout{sectioning}
  {\ifx\bbl@opt@headfoot\@nnil
     \g@addto@macro\@resetactivechars{%
       \set@typeset@protect
       \expandafter\select@language@x\expandafter{\bbl@main@language}%
       \let\protect\noexpand
       \ifcase\bbl@bidimode\else % Only with bidi. See also above
         \edef\thepage{%
           \noexpand\babelsublr{\unexpanded\expandafter{\thepage}}}%
       \fi}%
   \fi}
  {\ifbbl@single\else
     \bbl@ifunset{markright }\bbl@redefine\bbl@redefinerobust
     \markright#1{%
       \bbl@ifblank{#1}%
         {\org@markright{}}%
         {\toks@{#1}%
          \bbl@exp{%
            \\\org@markright{\\\protect\\\foreignlanguage{\languagename}%
              {\\\protect\\\bbl@restore@actives\the\toks@}}}}}%
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\markboth}
%  \begin{macro}{\@mkboth}
%    The definition of |\markboth| is equivalent to that of
%    |\markright|, except that we need two token registers. The
%    documentclasses \cls{report} and \cls{book} define and set the
%    headings for the page. While doing so they also store a copy of
%    |\markboth| in |\@mkboth|. Therefore we need to check whether
%    |\@mkboth| has already been set. If so we neeed to do that again
%    with the new definition of |\markboth|. (As of Oct 2019, \LaTeX{}
%    stores the definition in an intermediate macro, so it's not
%    necessary anymore, but it's preserved for older versions.)
%
%    \begin{macrocode}
     \ifx\@mkboth\markboth
       \def\bbl@tempc{\let\@mkboth\markboth}
     \else
       \def\bbl@tempc{}
     \fi
     \bbl@ifunset{markboth }\bbl@redefine\bbl@redefinerobust
     \markboth#1#2{%
       \protected@edef\bbl@tempb##1{%
         \protect\foreignlanguage
         {\languagename}{\protect\bbl@restore@actives##1}}%
       \bbl@ifblank{#1}%
         {\toks@{}}%
         {\toks@\expandafter{\bbl@tempb{#1}}}%
       \bbl@ifblank{#2}%
         {\@temptokena{}}%
         {\@temptokena\expandafter{\bbl@tempb{#2}}}%
       \bbl@exp{\\\org@markboth{\the\toks@}{\the\@temptokena}}}
       \bbl@tempc
     \fi}  % end ifbbl@single, end \IfBabelLayout
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \subsection{Preventing clashes with other packages}
%
% \subsubsection{\pkg{ifthen}}
%
% \begin{macro}{\ifthenelse}
%
% Sometimes a document writer wants to create a special effect
% depending on the page a certain fragment of text appears on. This
% can be achieved by the following piece of code:
%\begin{verbatim}
%    \ifthenelse{\isodd{\pageref{some:label}}}
%               {code for odd pages}
%               {code for even pages}
%\end{verbatim}
% In order for this to work the argument of |\isodd| needs to be
% fully expandable. With the above redefinition of |\pageref| it is
% not in the case of this example. To overcome that, we add some
% code to the definition of |\ifthenelse| to make things work.
%
% We want to revert the definition of |\pageref| and |\ref| to
% their original definition for the first argument of |\ifthenelse|,
% so we first need to store their current meanings.
%
% Then we can set the |\@safe@actives| switch and call the original
% |\ifthenelse|. In order to be able to use shorthands in the
% second and third arguments of |\ifthenelse| the resetting of the
% switch \emph{and} the definition of |\pageref| happens inside
% those arguments. 
%
%    \begin{macrocode}
\bbl@trace{Preventing clashes with other packages}
\bbl@xin@{R}\bbl@opt@safe
\ifin@
  \AtBeginDocument{%
    \@ifpackageloaded{ifthen}{%
      \bbl@redefine@long\ifthenelse#1#2#3{%
        \let\bbl@temp@pref\pageref
        \let\pageref\org@pageref
        \let\bbl@temp@ref\ref
        \let\ref\org@ref
        \@safe@activestrue
        \org@ifthenelse{#1}%
          {\let\pageref\bbl@temp@pref
           \let\ref\bbl@temp@ref
           \@safe@activesfalse
           #2}%
          {\let\pageref\bbl@temp@pref
           \let\ref\bbl@temp@ref
           \@safe@activesfalse
           #3}%
        }%
      }{}%
    }
%    \end{macrocode}
%
%  \end{macro}
%
% \subsubsection{\pkg{varioref}}
%
% \begin{macro}{\@@vpageref}
% \begin{macro}{\vrefpagenum}
% \begin{macro}{\Ref}
%
% When the package varioref is in use we need to modify its
% internal command |\@@vpageref| in order to prevent problems when
% an active character ends up in the argument of |\vref|. The same
% needs to happen for |\vrefpagenum|.
%
%    \begin{macrocode}
  \AtBeginDocument{%
    \@ifpackageloaded{varioref}{%
      \bbl@redefine\@@vpageref#1[#2]#3{%
        \@safe@activestrue
        \org@@@vpageref{#1}[#2]{#3}%
        \@safe@activesfalse}%
      \bbl@redefine\vrefpagenum#1#2{%
        \@safe@activestrue
        \org@vrefpagenum{#1}{#2}%
        \@safe@activesfalse}%
%    \end{macrocode}
%
% The package \pkg{varioref} defines |\Ref| to be a robust command
% wich uppercases the first character of the reference text. In
% order to be able to do that it needs to access the expandable form
% of |\ref|. So we employ a little trick here. We redefine the
% (internal) command \verb*|\Ref | to call |\org@ref| instead of
% |\ref|. The disadvantage of this solution is that whenever the
% definition of |\Ref| changes, this definition needs to be updated
% as well.
%
%    \begin{macrocode}
      \expandafter\def\csname Ref \endcsname#1{%
        \protected@edef\@tempa{\org@ref{#1}}\expandafter\MakeUppercase\@tempa}
      }{}%
    }
\fi
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% \subsubsection{\pkg{hhline}}
%
% \begin{macro}{\hhline}
%
% Delaying the activation of the shorthand characters has introduced
% a problem with the \pkg{hhline} package. The reason is that it
% uses the `:' character which is made active by the french support
% in \babel. Therefore we need to \emph{reload} the package when
% the `:' is an active character. Note that this happens
% \emph{after} the category code of the @-sign has been changed to
% other, so we need to temporarily change it to letter again.
%
%    \begin{macrocode}
\AtEndOfPackage{%
  \AtBeginDocument{%
    \@ifpackageloaded{hhline}%
      {\expandafter\ifx\csname normal@char\string:\endcsname\relax
       \else
         \makeatletter
         \def\@currname{hhline}\input{hhline.sty}\makeatother
       \fi}%
      {}}}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsubsection{\pkg{hyperref}}
%
% \begin{macro}{\pdfstringdefDisableCommands}
%
% A number of interworking problems between \pkg{babel} and
% \pkg{hyperref} are tackled by \pkg{hyperref} itself. The
% following code was introduced to prevent some annoying warnings
% but it broke bookmarks. This was quickly fixed in \pkg{hyperref},
% which essentially made it no-op. However, it will not removed for
% the moment because \pkg{hyperref} is expecting it. TODO. Still
% true? Commented out in 2020/07/27.
%
%    \begin{macrocode}
% \AtBeginDocument{%
%   \ifx\pdfstringdefDisableCommands\@undefined\else
%     \pdfstringdefDisableCommands{\languageshorthands{system}}%
%   \fi}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsubsection{\pkg{fancyhdr}}
%
% \begin{macro}{\FOREIGNLANGUAGE}
%
% The package \pkg{fancyhdr} treats the running head and fout lines
% somewhat differently as the standard classes. A symptom of this is
% that the command |\foreignlanguage| which \babel\ adds to the
% marks can end up inside the argument of |\MakeUppercase|. To
% prevent unexpected results we need to define |\FOREIGNLANGUAGE|
% here.
%
%    \begin{macrocode}
\DeclareRobustCommand{\FOREIGNLANGUAGE}[1]{%
  \lowercase{\foreignlanguage{#1}}}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\substitutefontfamily}
%
% The command |\substitutefontfamily| creates an
% \file{.fd} file on the fly. The first argument is an encoding
% mnemonic, the second and third arguments are font family names.
% This command is deprecated. Use the tools provides by \LaTeX.
%
%    \begin{macrocode}
\def\substitutefontfamily#1#2#3{%
  \lowercase{\immediate\openout15=#1#2.fd\relax}%
  \immediate\write15{%
    \string\ProvidesFile{#1#2.fd}%
    [\the\year/\two@digits{\the\month}/\two@digits{\the\day}
     \space generated font description file]^^J
    \string\DeclareFontFamily{#1}{#2}{}^^J
    \string\DeclareFontShape{#1}{#2}{m}{n}{<->ssub * #3/m/n}{}^^J
    \string\DeclareFontShape{#1}{#2}{m}{it}{<->ssub * #3/m/it}{}^^J
    \string\DeclareFontShape{#1}{#2}{m}{sl}{<->ssub * #3/m/sl}{}^^J
    \string\DeclareFontShape{#1}{#2}{m}{sc}{<->ssub * #3/m/sc}{}^^J
    \string\DeclareFontShape{#1}{#2}{b}{n}{<->ssub * #3/bx/n}{}^^J
    \string\DeclareFontShape{#1}{#2}{b}{it}{<->ssub * #3/bx/it}{}^^J
    \string\DeclareFontShape{#1}{#2}{b}{sl}{<->ssub * #3/bx/sl}{}^^J
    \string\DeclareFontShape{#1}{#2}{b}{sc}{<->ssub * #3/bx/sc}{}^^J
    }%
  \closeout15
  }
\@onlypreamble\substitutefontfamily
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Encoding and fonts}
%
%  Because documents may use non-ASCII font encodings, we make sure
%  that the logos of \TeX\ and \LaTeX\ always come out in the right
%  encoding. There is a list of non-ASCII encodings. Unfortunately,
%  \textsf{fontenc} deletes its package options, so we must guess which
%  encodings has been loaded by traversing |\@filelist| to search for
%  \m{enc}|enc.def|. If a non-ASCII has been loaded, we define versions
%  of |\TeX| and |\LaTeX| for them using |\ensureascii|. The default
%  ASCII encoding is set, too (in reverse order): the ``main'' encoding
%  (when the document begins), the last loaded, or |OT1|.
%
%  \begin{macro}{\ensureascii}
%
%    \begin{macrocode}
\bbl@trace{Encoding and fonts}
\newcommand\BabelNonASCII{LGR,X2,OT2,OT3,OT6,LHE,LWN,LMA,LMC,LMS,LMU,PU,PD1}
\newcommand\BabelNonText{TS1,T3,TS3}
\let\org@TeX\TeX
\let\org@LaTeX\LaTeX
\let\ensureascii\@firstofone
\AtBeginDocument{%
  \in@false
  \bbl@foreach\BabelNonASCII{% is there a text non-ascii enc?
    \ifin@\else
      \lowercase{\bbl@xin@{,#1enc.def,}{,\@filelist,}}%
    \fi}%
  \ifin@ % if a text non-ascii has been loaded
    \def\ensureascii#1{{\fontencoding{OT1}\selectfont#1}}%
    \DeclareTextCommandDefault{\TeX}{\org@TeX}%
    \DeclareTextCommandDefault{\LaTeX}{\org@LaTeX}%
    \def\bbl@tempb#1\@@{\uppercase{\bbl@tempc#1}ENC.DEF\@empty\@@}%
    \def\bbl@tempc#1ENC.DEF#2\@@{%
      \ifx\@empty#2\else
        \bbl@ifunset{T@#1}%
          {}%
          {\bbl@xin@{,#1,}{,\BabelNonASCII,\BabelNonText,}%
           \ifin@
             \DeclareTextCommand{\TeX}{#1}{\ensureascii{\org@TeX}}%
             \DeclareTextCommand{\LaTeX}{#1}{\ensureascii{\org@LaTeX}}%
           \else
             \def\ensureascii##1{{\fontencoding{#1}\selectfont##1}}%
           \fi}%
      \fi}%
    \bbl@foreach\@filelist{\bbl@tempb#1\@@}%  TODO - \@@ de mas??
    \bbl@xin@{,\cf@encoding,}{,\BabelNonASCII,\BabelNonText,}%
    \ifin@\else
      \edef\ensureascii#1{{%
        \noexpand\fontencoding{\cf@encoding}\noexpand\selectfont#1}}%
    \fi
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  Now comes the old deprecated stuff (with a little change in 3.9l,
%  for \textsf{fontspec}).  The first thing we need to do is to
%  determine, at |\begin{document}|, which latin fontencoding to use.
%
%  \begin{macro}{\latinencoding}
%    When text is being typeset in an encoding other than `latin'
%    (\texttt{OT1} or \texttt{T1}), it would be nice to still have
%    Roman numerals come out in the Latin encoding.
%    So we first assume that the current encoding at the end
%    of processing the package is the Latin encoding.
%
%    \begin{macrocode}
\AtEndOfPackage{\edef\latinencoding{\cf@encoding}}
%    \end{macrocode}
%
%    But this might be overruled with a later loading of the package
%    \pkg{fontenc}. Therefore we check at the execution of
%    |\begin{document}| whether it was loaded with the \Lopt{T1}
%    option. The normal way to do this (using |\@ifpackageloaded|) is
%    disabled for this package. Now we have to revert to parsing the
%    internal macro |\@filelist| which contains all the filenames
%    loaded.
%
%    \begin{macrocode}
\AtBeginDocument{%
  \@ifpackageloaded{fontspec}%
    {\xdef\latinencoding{%
       \ifx\UTFencname\@undefined
         EU\ifcase\bbl@engine\or2\or1\fi
       \else
         \UTFencname
       \fi}}%
    {\gdef\latinencoding{OT1}%
     \ifx\cf@encoding\bbl@t@one
       \xdef\latinencoding{\bbl@t@one}%
     \else
       \ifx\@fontenc@load@list\@undefined
         \@ifl@aded{def}{t1enc}{\xdef\latinencoding{\bbl@t@one}}{}%
       \else
         \def\@elt#1{,#1,}%
         \edef\bbl@tempa{\expandafter\@gobbletwo\@fontenc@load@list}%
         \let\@elt\relax
         \bbl@xin@{,T1,}\bbl@tempa
         \ifin@
           \xdef\latinencoding{\bbl@t@one}%
         \fi
       \fi
     \fi}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\latintext}
%    Then we can define the command |\latintext| which is a
%    declarative switch to a latin font-encoding. Usage of this macro
%    is deprecated.
%
%    \begin{macrocode}
\DeclareRobustCommand{\latintext}{%
  \fontencoding{\latinencoding}\selectfont
  \def\encodingdefault{\latinencoding}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\textlatin}
%    This command takes an argument which is then typeset using the
%    requested font encoding. In order to avoid many encoding switches
%    it operates in a local scope.
%
%    \begin{macrocode}
\ifx\@undefined\DeclareTextFontCommand
  \DeclareRobustCommand{\textlatin}[1]{\leavevmode{\latintext #1}}
\else
  \DeclareTextFontCommand{\textlatin}{\latintext}
\fi
%    \end{macrocode}
%
% \end{macro}
%
% \subsection{Basic bidi support}
%
% \textbf{Work in progress.} This code is currently placed here for
% practical reasons. It will be moved to the correct place soon, I
% hope.
%
% It is loosely based on |rlbabel.def|, but most of it has been
% developed from scratch. This \babel{} module (by Johannes Braams and
% Boris Lavva) has served the purpose of typesetting R documents for
% two decades, and despite its flaws I think it is still a good starting
% point (some parts have been copied here almost verbatim), partly
% thanks to its simplicity. I've also looked at \textsc{arabi} (by
% Youssef Jabri), which is compatible with \babel{}.
%
% There are two ways of modifying macros to make them “bidi”, namely,
% by patching the internal low-level macros (which is what I have done
% with lists, columns, counters, tocs, much like |rlbabel| did), and
% by introducing a “middle layer” just below the user interface
% (sectioning, footnotes).
%
% \begin{itemize}
% \item pdftex provides a minimal support for bidi text, and it
%   must be done by hand. Vertical typesetting is not possible.
% \item \xetex{} is somewhat better, thanks to its font engine
%   (even if not always reliable) and a few additional tools. However,
%   very little is done at the paragraph level. Another challenging
%   problem is text direction does not honour \TeX{} grouping.
% \item \luatex{} can provide the most complete solution, as we can
%   manipulate almost freely the node list, the generated lines,
%   and so on, but bidi text does not work out of the box and some
%   development is necessary. It also provides tools to properly
%   set left-to-right and right-to-left page layouts. As Lua\TeX-ja
%   shows, vertical typesetting is possible, too.
% \end{itemize}
%
% As a frist step, add a handler for bidi and digits (and potentially
% other processes) just before \textsf{luaoftload} is applied, which is
% loaded by default by \LaTeX. Just in case, consider the possibility
% it has not been loaded.
%
%    \begin{macrocode}
\ifodd\bbl@engine
  \def\bbl@activate@preotf{%
    \let\bbl@activate@preotf\relax  % only once
    \directlua{
      Babel = Babel or {}
      %
      function Babel.pre_otfload_v(head)
        if Babel.numbers and Babel.digits_mapped then
          head = Babel.numbers(head)
        end
        if Babel.bidi_enabled then
          head = Babel.bidi(head, false, dir)
        end
        return head
      end
      %
      function Babel.pre_otfload_h(head, gc, sz, pt, dir)
        if Babel.numbers and Babel.digits_mapped then
          head = Babel.numbers(head)
        end
        if Babel.bidi_enabled then
          head = Babel.bidi(head, false, dir)
        end
        return head
      end
      %
      luatexbase.add_to_callback('pre_linebreak_filter',
        Babel.pre_otfload_v,
        'Babel.pre_otfload_v',
        luatexbase.priority_in_callback('pre_linebreak_filter',
          'luaotfload.node_processor') or nil)
      %
      luatexbase.add_to_callback('hpack_filter',
        Babel.pre_otfload_h,
        'Babel.pre_otfload_h',
        luatexbase.priority_in_callback('hpack_filter',
          'luaotfload.node_processor') or nil)
    }}
\fi
%    \end{macrocode}
%
% The basic setup. In luatex, the output is modified at a very low
% level to set the |\bodydir| to the |\pagedir|.
%
%    \begin{macrocode}
\bbl@trace{Loading basic (internal) bidi support}
\ifodd\bbl@engine
  \ifnum\bbl@bidimode>100 \ifnum\bbl@bidimode<200
    \let\bbl@beforeforeign\leavevmode
    \AtEndOfPackage{\EnableBabelHook{babel-bidi}}
    \RequirePackage{luatexbase}
    \bbl@activate@preotf
    \directlua{
      require('babel-data-bidi.lua')
      \ifcase\expandafter\@gobbletwo\the\bbl@bidimode\or
        require('babel-bidi-basic.lua')
      \or
        require('babel-bidi-basic-r.lua')
      \fi}
    % TODO - to locale_props, not as separate attribute
    \newattribute\bbl@attr@dir
    % TODO. I don't like it, hackish:
    \bbl@exp{\output{\bodydir\pagedir\the\output}}
    \AtEndOfPackage{\EnableBabelHook{babel-bidi}}
  \fi\fi
\else
  \ifnum\bbl@bidimode>100 \ifnum\bbl@bidimode<200
    \bbl@error
      {The bidi method 'basic' is available only in\\%
       luatex. I'll continue with 'bidi=default', so\\%
       expect wrong results}%
      {See the manual for further details.}%
    \let\bbl@beforeforeign\leavevmode
    \AtEndOfPackage{%
      \EnableBabelHook{babel-bidi}%
      \bbl@xebidipar}
  \fi\fi
  \def\bbl@loadxebidi#1{%
    \ifx\RTLfootnotetext\@undefined
      \AtEndOfPackage{%
        \EnableBabelHook{babel-bidi}%
        \ifx\fontspec\@undefined
          \bbl@loadfontspec % bidi needs fontspec
        \fi
        \usepackage#1{bidi}}%
    \fi}
  \ifnum\bbl@bidimode>200
    \ifcase\expandafter\@gobbletwo\the\bbl@bidimode\or
      \bbl@tentative{bidi=bidi}
      \bbl@loadxebidi{}
    \or
      \bbl@loadxebidi{[rldocument]}
    \or
      \bbl@loadxebidi{}
    \fi
  \fi
\fi
\ifnum\bbl@bidimode=\@ne
  \let\bbl@beforeforeign\leavevmode
  \ifodd\bbl@engine
    \newattribute\bbl@attr@dir
    \bbl@exp{\output{\bodydir\pagedir\the\output}}%
  \fi
  \AtEndOfPackage{%
    \EnableBabelHook{babel-bidi}%
    \ifodd\bbl@engine\else
      \bbl@xebidipar
    \fi}
\fi
%    \end{macrocode}
%
% Now come the macros used to set the direction when a language is
% switched. First the (mostly) common macros.
%
%    \begin{macrocode}
\bbl@trace{Macros to switch the text direction}
\def\bbl@alscripts{,Arabic,Syriac,Thaana,}
\def\bbl@rscripts{% TODO. Base on codes ??
  ,Imperial Aramaic,Avestan,Cypriot,Hatran,Hebrew,%
  Old Hungarian,Old Hungarian,Lydian,Mandaean,Manichaean,%
  Manichaean,Meroitic Cursive,Meroitic,Old North Arabian,%
  Nabataean,N'Ko,Orkhon,Palmyrene,Inscriptional Pahlavi,%
  Psalter Pahlavi,Phoenician,Inscriptional Parthian,Samaritan,%
  Old South Arabian,}%
\def\bbl@provide@dirs#1{%
  \bbl@xin@{\csname bbl@sname@#1\endcsname}{\bbl@alscripts\bbl@rscripts}%
  \ifin@
    \global\bbl@csarg\chardef{wdir@#1}\@ne
    \bbl@xin@{\csname bbl@sname@#1\endcsname}{\bbl@alscripts}%
    \ifin@
      \global\bbl@csarg\chardef{wdir@#1}\tw@  % useless in xetex
    \fi
  \else
    \global\bbl@csarg\chardef{wdir@#1}\z@
  \fi
  \ifodd\bbl@engine
    \bbl@csarg\ifcase{wdir@#1}%
      \directlua{ Babel.locale_props[\the\localeid].textdir = 'l' }%
    \or
      \directlua{ Babel.locale_props[\the\localeid].textdir = 'r' }%
    \or
      \directlua{ Babel.locale_props[\the\localeid].textdir = 'al' }%
    \fi
  \fi}
\def\bbl@switchdir{%
  \bbl@ifunset{bbl@lsys@\languagename}{\bbl@provide@lsys{\languagename}}{}%
  \bbl@ifunset{bbl@wdir@\languagename}{\bbl@provide@dirs{\languagename}}{}%
  \bbl@exp{\\\bbl@setdirs\bbl@cl{wdir}}}
\def\bbl@setdirs#1{% TODO - math
  \ifcase\bbl@select@type % TODO - strictly, not the right test
    \bbl@bodydir{#1}%
    \bbl@pardir{#1}%
  \fi
  \bbl@textdir{#1}}
% TODO. Only if \bbl@bidimode > 0?:
\AddBabelHook{babel-bidi}{afterextras}{\bbl@switchdir}
\DisableBabelHook{babel-bidi}
%    \end{macrocode}
%
% Now the engine-dependent macros. TODO. Must be moved to the engine
% files?
%
%    \begin{macrocode} 
\ifodd\bbl@engine  % luatex=1
  \chardef\bbl@thetextdir\z@
  \chardef\bbl@thepardir\z@
  \def\bbl@getluadir#1{%
    \directlua{
      if tex.#1dir == 'TLT' then
        tex.sprint('0')
      elseif tex.#1dir == 'TRT' then
        tex.sprint('1')
      end}}
  \def\bbl@setluadir#1#2#3{% 1=text/par.. 2=\textdir.. 3=0 lr/1 rl
    \ifcase#3\relax
      \ifcase\bbl@getluadir{#1}\relax\else
        #2 TLT\relax
      \fi
    \else
      \ifcase\bbl@getluadir{#1}\relax
        #2 TRT\relax
      \fi
    \fi}
  \def\bbl@textdir#1{%
    \bbl@setluadir{text}\textdir{#1}%
    \chardef\bbl@thetextdir#1\relax
    \setattribute\bbl@attr@dir{\numexpr\bbl@thepardir*3+#1}}
  \def\bbl@pardir#1{%
    \bbl@setluadir{par}\pardir{#1}%
    \chardef\bbl@thepardir#1\relax}
  \def\bbl@bodydir{\bbl@setluadir{body}\bodydir}
  \def\bbl@pagedir{\bbl@setluadir{page}\pagedir}
  \def\bbl@dirparastext{\pardir\the\textdir\relax}%   %%%%
  % Sadly, we have to deal with boxes in math with basic.
  % Activated every math with the package option bidi=:
  \ifnum\bbl@bidimode>\z@
    \def\bbl@mathboxdir{%
      \ifcase\bbl@thetextdir\relax
        \everyhbox{\bbl@mathboxdir@aux L}%
      \else
        \everyhbox{\bbl@mathboxdir@aux R}%
       \fi}
    \def\bbl@mathboxdir@aux#1{%
      \@ifnextchar\egroup{}{\textdir T#1T\relax}}
    \frozen@everymath\expandafter{%
      \expandafter\bbl@mathboxdir\the\frozen@everymath}
    \frozen@everydisplay\expandafter{%
      \expandafter\bbl@mathboxdir\the\frozen@everydisplay}
  \fi
\else % pdftex=0, xetex=2
  \newcount\bbl@dirlevel
  \chardef\bbl@thetextdir\z@
  \chardef\bbl@thepardir\z@
  \def\bbl@textdir#1{%
    \ifcase#1\relax
       \chardef\bbl@thetextdir\z@
       \bbl@textdir@i\beginL\endL
     \else
       \chardef\bbl@thetextdir\@ne
       \bbl@textdir@i\beginR\endR
    \fi}
  \def\bbl@textdir@i#1#2{%
    \ifhmode
      \ifnum\currentgrouplevel>\z@
        \ifnum\currentgrouplevel=\bbl@dirlevel
          \bbl@error{Multiple bidi settings inside a group}%
            {I'll insert a new group, but expect wrong results.}%
          \bgroup\aftergroup#2\aftergroup\egroup
        \else
          \ifcase\currentgrouptype\or % 0 bottom
            \aftergroup#2% 1 simple {}
          \or
            \bgroup\aftergroup#2\aftergroup\egroup % 2 hbox
          \or
            \bgroup\aftergroup#2\aftergroup\egroup % 3 adj hbox
          \or\or\or % vbox vtop align
          \or
            \bgroup\aftergroup#2\aftergroup\egroup % 7 noalign
          \or\or\or\or\or\or % output math disc insert vcent mathchoice
          \or
            \aftergroup#2% 14 \begingroup
          \else
            \bgroup\aftergroup#2\aftergroup\egroup % 15 adj
          \fi
        \fi
        \bbl@dirlevel\currentgrouplevel
      \fi
      #1%
    \fi}
  \def\bbl@pardir#1{\chardef\bbl@thepardir#1\relax}
  \let\bbl@bodydir\@gobble
  \let\bbl@pagedir\@gobble
  \def\bbl@dirparastext{\chardef\bbl@thepardir\bbl@thetextdir}
%    \end{macrocode}
%
% The following command is executed only if there is a right-to-left
% script (once). It activates the |\everypar| hack for \xetex, to
% properly handle the par direction. Note text and par dirs are
% decoupled to some extent (although not completely).
%
%    \begin{macrocode}
  \def\bbl@xebidipar{%
    \let\bbl@xebidipar\relax
    \TeXXeTstate\@ne
    \def\bbl@xeeverypar{%
      \ifcase\bbl@thepardir
        \ifcase\bbl@thetextdir\else\beginR\fi
      \else
        {\setbox\z@\lastbox\beginR\box\z@}%
      \fi}%
    \let\bbl@severypar\everypar
    \newtoks\everypar
    \everypar=\bbl@severypar
    \bbl@severypar{\bbl@xeeverypar\the\everypar}}
  \ifnum\bbl@bidimode>200
    \let\bbl@textdir@i\@gobbletwo
    \let\bbl@xebidipar\@empty
    \AddBabelHook{bidi}{foreign}{%
      \def\bbl@tempa{\def\BabelText####1}%
      \ifcase\bbl@thetextdir
        \expandafter\bbl@tempa\expandafter{\BabelText{\LR{##1}}}%
      \else
        \expandafter\bbl@tempa\expandafter{\BabelText{\RL{##1}}}%
      \fi}
    \def\bbl@pardir#1{\ifcase#1\relax\setLR\else\setRL\fi}
  \fi
\fi
%    \end{macrocode}
%
% A tool for weak L (mainly digits). We also disable warnings with
% \textsf{hyperref}.
%
%    \begin{macrocode}
\DeclareRobustCommand\babelsublr[1]{\leavevmode{\bbl@textdir\z@#1}}
\AtBeginDocument{%
  \ifx\pdfstringdefDisableCommands\@undefined\else
    \ifx\pdfstringdefDisableCommands\relax\else
      \pdfstringdefDisableCommands{\let\babelsublr\@firstofone}%
    \fi
  \fi}
%    \end{macrocode}
%
% \subsection{Local Language Configuration}
%
% \begin{macro}{\loadlocalcfg}
%
% At some sites it may be necessary to add site-specific actions to
% a language definition file. This can be done by creating a file
% with the same name as the language definition file, but with the
% extension \file{.cfg}. For instance the file \file{norsk.cfg}
% will be loaded when the language definition file \file{norsk.ldf}
% is loaded. 
%
% For plain-based formats we don't want to override the definition
% of |\loadlocalcfg| from \file{plain.def}.
%
%    \begin{macrocode}
\bbl@trace{Local Language Configuration}
\ifx\loadlocalcfg\@undefined
  \@ifpackagewith{babel}{noconfigs}%
    {\let\loadlocalcfg\@gobble}%
    {\def\loadlocalcfg#1{%
      \InputIfFileExists{#1.cfg}%
        {\typeout{*************************************^^J%
                       * Local config file #1.cfg used^^J%
                       *}}%
        \@empty}}
\fi
%    \end{macrocode}%
%    \end{macro}
%
% \subsection{Language options}
%
% Languages are loaded when processing the corresponding option
% \textit{except} if a |main| language has been set. In such a
% case, it is not loaded until all options has been processed.
% The following macro inputs the ldf file and does some additional
% checks (|\input| works, too, but possible errors are not catched).
%
%    \begin{macrocode}
\bbl@trace{Language options}
\let\bbl@afterlang\relax
\let\BabelModifiers\relax
\let\bbl@loaded\@empty
\def\bbl@load@language#1{%
  \InputIfFileExists{#1.ldf}%
    {\edef\bbl@loaded{\CurrentOption
       \ifx\bbl@loaded\@empty\else,\bbl@loaded\fi}%
     \expandafter\let\expandafter\bbl@afterlang
        \csname\CurrentOption.ldf-h@@k\endcsname
     \expandafter\let\expandafter\BabelModifiers
        \csname bbl@mod@\CurrentOption\endcsname}%
    {\bbl@error{%
       Unknown option '\CurrentOption'. Either you misspelled it\\%
       or the language definition file \CurrentOption.ldf was not found}{%
       Valid options are, among others: shorthands=, KeepShorthandsActive,\\%
       activeacute, activegrave, noconfigs, safe=, main=, math=\\%
       headfoot=, strings=, config=, hyphenmap=, or a language name.}}}
%    \end{macrocode}
%
% Now, we set a few language options whose names are different from
% |ldf| files. These declarations are preserved for backwards
% compatibility, but they must be eventually removed. Use proxy files
% instead.
%
%    \begin{macrocode}
\def\bbl@try@load@lang#1#2#3{%
  \IfFileExists{\CurrentOption.ldf}%
    {\bbl@load@language{\CurrentOption}}%
    {#1\bbl@load@language{#2}#3}}
\DeclareOption{hebrew}{%
  \input{rlbabel.def}%
  \bbl@load@language{hebrew}}
\DeclareOption{hungarian}{\bbl@try@load@lang{}{magyar}{}}
\DeclareOption{lowersorbian}{\bbl@try@load@lang{}{lsorbian}{}}
\DeclareOption{nynorsk}{\bbl@try@load@lang{}{norsk}{}}
\DeclareOption{polutonikogreek}{%
  \bbl@try@load@lang{}{greek}{\languageattribute{greek}{polutoniko}}}
\DeclareOption{russian}{\bbl@try@load@lang{}{russianb}{}}
\DeclareOption{ukrainian}{\bbl@try@load@lang{}{ukraineb}{}}
\DeclareOption{uppersorbian}{\bbl@try@load@lang{}{usorbian}{}}
%    \end{macrocode}
%
% Another way to extend the list of `known' options for \babel\ was
% to create the file \file{bblopts.cfg} in which one can add option
% declarations. However, this mechanism is deprecated -- if you
% want an alternative name for a language, just create a new |.ldf|
% file loading the actual one. You can also set the name
% of the file with the package option |config=<name>|, which will
% load |<name>.cfg| instead.
%
%    \begin{macrocode}
\ifx\bbl@opt@config\@nnil
  \@ifpackagewith{babel}{noconfigs}{}%
    {\InputIfFileExists{bblopts.cfg}%
      {\typeout{*************************************^^J%
               * Local config file bblopts.cfg used^^J%
               *}}%
      {}}%
\else
  \InputIfFileExists{\bbl@opt@config.cfg}%
    {\typeout{*************************************^^J%
             * Local config file \bbl@opt@config.cfg used^^J%
             *}}%
    {\bbl@error{%
       Local config file '\bbl@opt@config.cfg' not found}{%
       Perhaps you misspelled it.}}%
\fi
%    \end{macrocode}
%
% Recognizing global options in packages not having a closed set of
% them is not trivial, as for them to be processed they must be
% defined explicitly. So, package options not yet taken into
% account and stored in |bbl@language@opts| are assumed to be
% languages (note this list also contains the language given with
% |main|). If not declared above, the names of the option and the
% file are the same.
%
%    \begin{macrocode}
\let\bbl@tempc\relax
\bbl@foreach\bbl@language@opts{%
  \ifcase\bbl@iniflag  % Default
    \bbl@ifunset{ds@#1}%
      {\DeclareOption{#1}{\bbl@load@language{#1}}}%
      {}%
  \or    % provide=*
    \@gobble % case 2 same as 1
  \or    % provide+=*
    \bbl@ifunset{ds@#1}%
      {\IfFileExists{#1.ldf}{}%
        {\IfFileExists{babel-#1.tex}{}{\@namedef{ds@#1}{}}}}%
      {}%
    \bbl@ifunset{ds@#1}%
      {\def\bbl@tempc{#1}%
       \DeclareOption{#1}{%
         \ifnum\bbl@iniflag>\@ne
           \bbl@ldfinit
           \babelprovide[import]{#1}%
           \bbl@afterldf{}%
         \else
           \bbl@load@language{#1}%
         \fi}}%
      {}%
  \or    % provide*=*
    \def\bbl@tempc{#1}%
    \bbl@ifunset{ds@#1}%
      {\DeclareOption{#1}{%
         \bbl@ldfinit
         \babelprovide[import]{#1}%
         \bbl@afterldf{}}}%
      {}%
  \fi}
%    \end{macrocode}
%
% Now, we make sure an option is explicitly declared for any language
% set as global option, by checking if an |ldf| exists. The previous
% step was, in fact, somewhat redundant, but that way we minimize
% accessing the file system just to see if the option could be a
% language.
%
%    \begin{macrocode}
\let\bbl@tempb\@nnil
\bbl@foreach\@classoptionslist{%
  \bbl@ifunset{ds@#1}%
    {\IfFileExists{#1.ldf}%
      {\def\bbl@tempb{#1}%
       \DeclareOption{#1}{%
         \ifnum\bbl@iniflag>\@ne
           \bbl@ldfinit
           \babelprovide[import]{#1}%
           \bbl@afterldf{}%
         \else
           \bbl@load@language{#1}%
         \fi}}%
      {\IfFileExists{babel-#1.tex}% TODO. Copypaste pattern
        {\def\bbl@tempb{#1}%
         \DeclareOption{#1}{%
           \ifnum\bbl@iniflag>\@ne
             \bbl@ldfinit
             \babelprovide[import]{#1}%
             \bbl@afterldf{}%
           \else
             \bbl@load@language{#1}%
           \fi}}%
         {}}}%
    {}}
%    \end{macrocode}
%
%    If a main language has been set, store it for the third pass.
%
%    \begin{macrocode}
\ifnum\bbl@iniflag=\z@\else
  \ifx\bbl@opt@main\@nnil
    \ifx\bbl@tempc\relax
      \let\bbl@opt@main\bbl@tempb
    \else
      \let\bbl@opt@main\bbl@tempc
    \fi
  \fi
\fi
\ifx\bbl@opt@main\@nnil\else
  \expandafter
  \let\expandafter\bbl@loadmain\csname ds@\bbl@opt@main\endcsname
  \expandafter\let\csname ds@\bbl@opt@main\endcsname\@empty
\fi
%    \end{macrocode}
%
% And we are done, because all options for this pass has been
% declared. Those already processed in the first pass are just
% ignored.
%
% The options have to be processed in the order in which the user
% specified them (except, of course, global options, which \LaTeX{}
% processes before):
%
%    \begin{macrocode}
\def\AfterBabelLanguage#1{%
  \bbl@ifsamestring\CurrentOption{#1}{\global\bbl@add\bbl@afterlang}{}}
\DeclareOption*{}
\ProcessOptions*
%    \end{macrocode}
%
% This finished the second pass. Now the third one begins, which
% loads the main language set with the key |main|. A warning is
% raised if the main language is not the same as the last named
% one, or if the value of the key |main| is not a language. Then
% execute directly the option (because it could be used only in
% |main|). After loading all languages, we deactivate
% |\AfterBabelLanguage|.
%
%    \begin{macrocode}
\bbl@trace{Option 'main'}
\ifx\bbl@opt@main\@nnil
  \edef\bbl@tempa{\@classoptionslist,\bbl@language@opts}
  \let\bbl@tempc\@empty
  \bbl@for\bbl@tempb\bbl@tempa{%
    \bbl@xin@{,\bbl@tempb,}{,\bbl@loaded,}%
    \ifin@\edef\bbl@tempc{\bbl@tempb}\fi}
  \def\bbl@tempa#1,#2\@nnil{\def\bbl@tempb{#1}}
  \expandafter\bbl@tempa\bbl@loaded,\@nnil
  \ifx\bbl@tempb\bbl@tempc\else
    \bbl@warning{%
      Last declared language option is '\bbl@tempc',\\%
      but the last processed one was '\bbl@tempb'.\\%
      The main language can't be set as both a global\\%
      and a package option. Use 'main=\bbl@tempc' as\\%
      option. Reported}%
  \fi
\else
  \ifodd\bbl@iniflag  % case 1,3
    \bbl@ldfinit
    \let\CurrentOption\bbl@opt@main
    \ifx\bbl@opt@provide\@nnil
      \bbl@exp{\\\babelprovide[import,main]{\bbl@opt@main}}
    \else
      \bbl@exp{\\\babelprovide[\bbl@opt@provide,main]{\bbl@opt@main}}%
    \fi
    \bbl@afterldf{}%
  \else % case 0,2
    \chardef\bbl@iniflag\z@  % Force ldf 
    \expandafter\let\csname ds@\bbl@opt@main\endcsname\bbl@loadmain
    \ExecuteOptions{\bbl@opt@main}
    \DeclareOption*{}%
    \ProcessOptions*
  \fi
\fi
\def\AfterBabelLanguage{%
  \bbl@error
    {Too late for \string\AfterBabelLanguage}%
    {Languages have been loaded, so I can do nothing}}
%    \end{macrocode}
%      
% In order to catch the case where the user forgot to specify a
% language we check whether |\bbl@main@language|, has become
% defined. If not, no language has been loaded and an error
% message is displayed.
%
%    \begin{macrocode}
\ifx\bbl@main@language\@undefined
  \bbl@info{%
    You haven't specified a language. I'll use 'nil'\\%
    as the main language. Reported}
    \bbl@load@language{nil}
\fi
%</package>
%<*core>
%    \end{macrocode}
%
% \section{The kernel of Babel (\texttt{babel.def}, common)}
%
% The kernel of the \babel\ system is currently stored in
% \file{babel.def}. The file \file{babel.def} contains most of the
% code. The file \file{hyphen.cfg} is a file that can be loaded into
% the format, which is necessary when you want to be able to switch
% hyphenation patterns.
%
% Because plain \TeX\ users might want to use some of the features of
% the \babel{} system too, care has to be taken that plain \TeX\ can
% process the files. For this reason the current format will have to
% be checked in a number of places. Some of the code below is common
% to plain \TeX\ and \LaTeX, some of it is for the \LaTeX\ case only.
%
% Plain formats based on etex (etex, xetex, luatex) don't load
% |hyphen.cfg| but |etex.src|, which follows a different naming
% convention, so we need to define the babel names. It presumes
% |language.def| exists and it is the same file used when formats were
% created.
%
% \subsection{Tools}
%
%    \begin{macrocode}
\ifx\ldf@quit\@undefined\else
\endinput\fi % Same line!
<@Make sure ProvidesFile is defined@>
\ProvidesFile{babel.def}[<@date@> <@version@> Babel common definitions]
%    \end{macrocode}
%
% The file |babel.def| expects some definitions made in the \LaTeXe{}
% style file. So, In \LaTeX2.09 and Plain{} we must provide at least
% some predefined values as well some tools to set them (even if not
% all options are available). There are no package options, and
% therefore and alternative mechanism is provided. For the moment,
% only |\babeloptionstrings| and |\babeloptionmath| are provided,
% which can be defined before loading \babel. |\BabelModifiers| can be
% set too (but not sure it works).
%
%    \begin{macrocode}
\ifx\AtBeginDocument\@undefined  % TODO. change test.
  <@Emulate LaTeX@>
  \def\languagename{english}%
  \let\bbl@opt@shorthands\@nnil
  \def\bbl@ifshorthand#1#2#3{#2}%
  \let\bbl@language@opts\@empty
  \ifx\babeloptionstrings\@undefined
    \let\bbl@opt@strings\@nnil
  \else
    \let\bbl@opt@strings\babeloptionstrings
  \fi
  \def\BabelStringsDefault{generic}
  \def\bbl@tempa{normal}
  \ifx\babeloptionmath\bbl@tempa
    \def\bbl@mathnormal{\noexpand\textormath}
  \fi
  \def\AfterBabelLanguage#1#2{}
  \ifx\BabelModifiers\@undefined\let\BabelModifiers\relax\fi
  \let\bbl@afterlang\relax
  \def\bbl@opt@safe{BR}
  \ifx\@uclclist\@undefined\let\@uclclist\@empty\fi
  \ifx\bbl@trace\@undefined\def\bbl@trace#1{}\fi
  \expandafter\newif\csname ifbbl@single\endcsname
  \chardef\bbl@bidimode\z@
\fi
%    \end{macrocode}
%
% Exit immediately with 2.09. An error is raised by the sty file, but
% also try to minimize the number of errors.
%
%    \begin{macrocode}
\ifx\bbl@trace\@undefined
  \let\LdfInit\endinput
  \def\ProvidesLanguage#1{\endinput}
\endinput\fi % Same line!
%    \end{macrocode}
%
% And continue.
%
% \section{Multiple languages}
%
% This is not a separate file (\texttt{switch.def}) anymore.
%
% Plain \TeX\ version~3.0 provides the primitive |\language| that
% is used to store the current language. When used with a pre-3.0
% version this function has to be implemented by allocating a
% counter.
%
%    \begin{macrocode}
<@Define core switching macros@>
%    \end{macrocode}
%
% \begin{macro}{\adddialect}
% The macro |\adddialect| can be used to add the name of a dialect
% or variant language, for which an already defined hyphenation
% table can be used.
%
%    \begin{macrocode}
\def\bbl@version{<@version@>}
\def\bbl@date{<@date@>}
\def\adddialect#1#2{%
  \global\chardef#1#2\relax
  \bbl@usehooks{adddialect}{{#1}{#2}}%
  \begingroup
    \count@#1\relax
    \def\bbl@elt##1##2##3##4{%
      \ifnum\count@=##2\relax
        \edef\bbl@tempa{\expandafter\@gobbletwo\string#1}%
        \bbl@info{Hyphen rules for '\expandafter\@gobble\bbl@tempa'
                  set to \expandafter\string\csname l@##1\endcsname\\%
                  (\string\language\the\count@). Reported}%
        \def\bbl@elt####1####2####3####4{}%
      \fi}%
    \bbl@cs{languages}%
  \endgroup}
%    \end{macrocode}
%
%  \end{macro}
%
%    |\bbl@iflanguage| executes code only if the language |l@|
%    exists. Otherwise raises and error.
%
%    The argument of |\bbl@fixname| has to be a macro name, as it may get
%    ``fixed'' if casing (lc/uc) is wrong. It's intented to fix a
%    long-standing bug when |\foreignlanguage| and the like appear in
%    a |\MakeXXXcase|. However, a lowercase form is not imposed to
%    improve backward compatibility (perhaps you defined a language
%    named |MYLANG|, but unfortunately mixed case names cannot be
%    trapped). Note |l@| is encapsulated, so that its case does not
%    change.
%
%    \begin{macrocode}
\def\bbl@fixname#1{%
  \begingroup
    \def\bbl@tempe{l@}%
    \edef\bbl@tempd{\noexpand\@ifundefined{\noexpand\bbl@tempe#1}}%
    \bbl@tempd
      {\lowercase\expandafter{\bbl@tempd}%
         {\uppercase\expandafter{\bbl@tempd}%
           \@empty
           {\edef\bbl@tempd{\def\noexpand#1{#1}}%
            \uppercase\expandafter{\bbl@tempd}}}%
         {\edef\bbl@tempd{\def\noexpand#1{#1}}%
          \lowercase\expandafter{\bbl@tempd}}}%
      \@empty
    \edef\bbl@tempd{\endgroup\def\noexpand#1{#1}}%
  \bbl@tempd
  \bbl@exp{\\\bbl@usehooks{languagename}{{\languagename}{#1}}}}
\def\bbl@iflanguage#1{%
  \@ifundefined{l@#1}{\@nolanerr{#1}\@gobble}\@firstofone}
%    \end{macrocode}
%
% After a name has been ‘fixed’, the selectors will try to load the
% language. If even the fixed name is not defined, will load it on the
% fly, either based on its name, or if activated, its BCP47 code.
%
% We first need a couple of macros for a simple BCP 47 look up. It also
% makes sure, with |\bbl@bcpcase|, casing is the correct one, so that
% sr-latn-ba becomes fr-Latn-BA. Note |#4| may contain some
% |\@empty|'s, but they are eventually removed. |\bbl@bcplookup| either
% returns the found |ini| or it is |\relax|.
% 
%    \begin{macrocode}
\def\bbl@bcpcase#1#2#3#4\@@#5{%
  \ifx\@empty#3%
    \uppercase{\def#5{#1#2}}%
  \else
    \uppercase{\def#5{#1}}%
    \lowercase{\edef#5{#5#2#3#4}}%
  \fi}
\def\bbl@bcplookup#1-#2-#3-#4\@@{%
  \let\bbl@bcp\relax
  \lowercase{\def\bbl@tempa{#1}}%
  \ifx\@empty#2%
    \IfFileExists{babel-\bbl@tempa.ini}{\let\bbl@bcp\bbl@tempa}{}%
  \else\ifx\@empty#3%
    \bbl@bcpcase#2\@empty\@empty\@@\bbl@tempb
    \IfFileExists{babel-\bbl@tempa-\bbl@tempb.ini}%
      {\edef\bbl@bcp{\bbl@tempa-\bbl@tempb}}%
      {}%
    \ifx\bbl@bcp\relax   
      \IfFileExists{babel-\bbl@tempa.ini}{\let\bbl@bcp\bbl@tempa}{}%
    \fi
  \else
    \bbl@bcpcase#2\@empty\@empty\@@\bbl@tempb
    \bbl@bcpcase#3\@empty\@empty\@@\bbl@tempc
    \IfFileExists{babel-\bbl@tempa-\bbl@tempb-\bbl@tempc.ini}%
      {\edef\bbl@bcp{\bbl@tempa-\bbl@tempb-\bbl@tempc}}%
      {}%
    \ifx\bbl@bcp\relax   
      \IfFileExists{babel-\bbl@tempa-\bbl@tempc.ini}%
        {\edef\bbl@bcp{\bbl@tempa-\bbl@tempc}}%
        {}%
    \fi
    \ifx\bbl@bcp\relax   
      \IfFileExists{babel-\bbl@tempa-\bbl@tempc.ini}%
        {\edef\bbl@bcp{\bbl@tempa-\bbl@tempc}}%
        {}%
    \fi
    \ifx\bbl@bcp\relax   
      \IfFileExists{babel-\bbl@tempa.ini}{\let\bbl@bcp\bbl@tempa}{}%
    \fi
  \fi\fi}
\let\bbl@initoload\relax
\def\bbl@provide@locale{%
  \ifx\babelprovide\@undefined
    \bbl@error{For a language to be defined on the fly 'base'\\%
               is not enough, and the whole package must be\\%
               loaded. Either delete the 'base' option or\\%
               request the languages explicitly}%
              {See the manual for further details.}%
  \fi
% TODO. Option to search if loaded, with \LocaleForEach
  \let\bbl@auxname\languagename % Still necessary. TODO
  \bbl@ifunset{bbl@bcp@map@\languagename}{}% Move uplevel??
    {\edef\languagename{\@nameuse{bbl@bcp@map@\languagename}}}% 
  \ifbbl@bcpallowed
    \expandafter\ifx\csname date\languagename\endcsname\relax
      \expandafter
      \bbl@bcplookup\languagename-\@empty-\@empty-\@empty\@@
      \ifx\bbl@bcp\relax\else  % Returned by \bbl@bcplookup
        \edef\languagename{\bbl@bcp@prefix\bbl@bcp}%
        \edef\localename{\bbl@bcp@prefix\bbl@bcp}%
        \expandafter\ifx\csname date\languagename\endcsname\relax
          \let\bbl@initoload\bbl@bcp
          \bbl@exp{\\\babelprovide[\bbl@autoload@bcpoptions]{\languagename}}%
          \let\bbl@initoload\relax
        \fi
        \bbl@csarg\xdef{bcp@map@\bbl@bcp}{\localename}%
      \fi
    \fi
  \fi
  \expandafter\ifx\csname date\languagename\endcsname\relax
    \IfFileExists{babel-\languagename.tex}%
      {\bbl@exp{\\\babelprovide[\bbl@autoload@options]{\languagename}}}%
      {}%
  \fi}
%    \end{macrocode}
%
%  \begin{macro}{\iflanguage}
% Users might want to test (in a private package for instance)
% which language is currently active. For this we provide a test
% macro, |\iflanguage|, that has three arguments.  It checks
% whether the first argument is a known language. If so, it
% compares the first argument with the value of |\language|. Then,
% depending on the result of the comparison, it executes either the
% second or the third argument.
%
%    \begin{macrocode}
\def\iflanguage#1{%
  \bbl@iflanguage{#1}{%
    \ifnum\csname l@#1\endcsname=\language
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi}}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Selecting the language}
%
%  \begin{macro}{\selectlanguage}
%
% The macro |\selectlanguage| checks whether the language is
% already defined before it performs its actual task, which is to
% update |\language| and activate language-specific definitions.
%
%    \begin{macrocode}
\let\bbl@select@type\z@
\edef\selectlanguage{%
  \noexpand\protect
  \expandafter\noexpand\csname selectlanguage \endcsname}
%    \end{macrocode}
%
% Because the command |\selectlanguage| could be used in a moving
% argument it expands to \verb*=\protect\selectlanguage =.
% Therefore, we have to make sure that a macro |\protect| exists.
% If it doesn't it is |\let| to |\relax|.
%
%    \begin{macrocode}
\ifx\@undefined\protect\let\protect\relax\fi
%    \end{macrocode}
%
% The following definition is preserved for backwards compatibility. It
% is related to a trick for 2.09.
%
%    \begin{macrocode}
\let\xstring\string
%    \end{macrocode}
%
% \end{macro}
%
%    Since version 3.5 \babel\ writes entries to the auxiliary files in
%    order to typeset table of contents etc. in the correct language
%    environment.
%
% \begin{macro}{\bbl@pop@language}
%
% \emph{But} when the language change happens \emph{inside} a group
% the end of the group doesn't write anything to the auxiliary
% files. Therefore we need \TeX's |aftergroup| mechanism to help
% us. The command |\aftergroup| stores the token immediately
% following it to be executed when the current group is closed. So
% we define a temporary control sequence |\bbl@pop@language| to be
% executed at the end of the group. It calls |\bbl@set@language|
% with the name of the current language as its argument.
%
% \begin{macro}{\bbl@language@stack}
% The previous solution works for one level of nesting groups, but
% as soon as more levels are used it is no longer adequate. For
% that case we need to keep track of the nested languages using a
% stack mechanism. This stack is called |\bbl@language@stack| and
% initially empty.
%
%    \begin{macrocode}
\def\bbl@language@stack{}
%    \end{macrocode}
%
% When using a stack we need a mechanism to push an element on the
% stack and to retrieve the information afterwards.
%
% \begin{macro}{\bbl@push@language}
% \begin{macro}{\bbl@pop@language}
% The stack is simply a list of languagenames, separated with a `+'
% sign; the push function can be simple:
%
%    \begin{macrocode}
\def\bbl@push@language{%
  \ifx\languagename\@undefined\else
    \xdef\bbl@language@stack{\languagename+\bbl@language@stack}%
  \fi}
%    \end{macrocode}
%
% Retrieving information from the stack is a little bit less simple, as
% we need to remove the element from the stack while storing it in the
% macro |\languagename|. For this we first define a helper function.
%  \begin{macro}{\bbl@pop@lang}
%    This macro stores its first element (which is delimited by the
%    `+'-sign) in |\languagename| and stores the rest of the string
%    in |\bbl@language@stack|.
%
%    \begin{macrocode}
\def\bbl@pop@lang#1+#2\@@{%
  \edef\languagename{#1}%
  \xdef\bbl@language@stack{#2}}
%    \end{macrocode}
%
%  \end{macro}
% The reason for the somewhat weird arrangement of arguments to the
% helper function is the fact it is called in the following way.
% This means that before |\bbl@pop@lang| is executed \TeX\ first
% \emph{expands} the stack, stored in |\bbl@language@stack|. The
% result of that is that the argument string of |\bbl@pop@lang|
% contains one or more language names, each followed by a `+'-sign
% (zero language names won't occur as this macro will only be
% called after something has been pushed on the stack).
%
%    \begin{macrocode}
\let\bbl@ifrestoring\@secondoftwo
\def\bbl@pop@language{%
  \expandafter\bbl@pop@lang\bbl@language@stack\@@
  \let\bbl@ifrestoring\@firstoftwo
  \expandafter\bbl@set@language\expandafter{\languagename}%
  \let\bbl@ifrestoring\@secondoftwo}
%    \end{macrocode}
%
% Once the name of the previous language is retrieved from the stack,
% it is fed to |\bbl@set@language| to do the actual work of
% switching everything that needs switching.
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% An alternative way to identify languages (in the \babel{} sense)
% with a numerical value is introduced in 3.30. This is one of the
% first steps for a new interface based on the concept of locale,
% which explains the name of |\localeid|. This means |\l@...| will be
% reserved for hyphenation patterns (so that two locales can share the
% same rules).
%
%    \begin{macrocode}
\chardef\localeid\z@
\def\bbl@id@last{0}    % No real need for a new counter
\def\bbl@id@assign{%
  \bbl@ifunset{bbl@id@@\languagename}%
    {\count@\bbl@id@last\relax
     \advance\count@\@ne
     \bbl@csarg\chardef{id@@\languagename}\count@
     \edef\bbl@id@last{\the\count@}%
     \ifcase\bbl@engine\or
       \directlua{
         Babel = Babel or {}
         Babel.locale_props = Babel.locale_props or {}
         Babel.locale_props[\bbl@id@last] = {}
         Babel.locale_props[\bbl@id@last].name = '\languagename'
        }%
      \fi}%
    {}%
    \chardef\localeid\bbl@cl{id@}}
%    \end{macrocode}
%
% The unprotected part of |\selectlanguage|.
%
%    \begin{macrocode}
\expandafter\def\csname selectlanguage \endcsname#1{%
  \ifnum\bbl@hymapsel=\@cclv\let\bbl@hymapsel\tw@\fi
  \bbl@push@language
  \aftergroup\bbl@pop@language
  \bbl@set@language{#1}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@set@language}
%
% The macro |\bbl@set@language| takes care of switching the language
% environment \emph{and} of writing entries on the auxiliary files.
% For historial reasons, language names can be either |language| of
% |\language|. To catch either form a trick is used, but
% unfortunately as a side effect the catcodes of letters in
% |\languagename| are messed up. This is a bug, but preserved for
% backwards compatibility. The list of auxiliary files can be
% extended by redefining |\BabelContentsFiles|, but make sure they
% are loaded inside a group (as |aux|, |toc|, |lof|, and |lot| do)
% or the last language of the document will remain active
% afterwards.
%
% We also write a command to change the current language in the
% auxiliary files.
%
% |\bbl@savelastskip| is used to deal with skips before the write
% whatsit (as suggested by U Fischer). Adapted from \textsf{hyperref},
% but it might fail, so I'll consider it a temporary hack, while I
% study other options (the ideal, but very likely unfeasible except
% perhaps in \luatex, is to avoid the |\write| altogether when not
% needed).
%
%    \begin{macrocode}
\def\BabelContentsFiles{toc,lof,lot}
\def\bbl@set@language#1{% from selectlanguage, pop@
  % The old buggy way. Preserved for compatibility.
  \edef\languagename{%
    \ifnum\escapechar=\expandafter`\string#1\@empty
    \else\string#1\@empty\fi}%
  \ifcat\relax\noexpand#1%
    \expandafter\ifx\csname date\languagename\endcsname\relax
      \edef\languagename{#1}%
      \let\localename\languagename
    \else
      \bbl@info{Using '\string\language' instead of 'language' is\\%
                deprecated. If what you want is to use a\\%
                macro containing the actual locale, make\\%
                sure it does not not match any language.\\%
                Reported}%
      \ifx\scantokens\@undefined
         \def\localename{??}%
      \else
        \scantokens\expandafter{\expandafter
          \def\expandafter\localename\expandafter{\languagename}}%
      \fi
    \fi
  \else
    \def\localename{#1}% This one has the correct catcodes
  \fi
  \select@language{\languagename}%
  % write to auxs
  \expandafter\ifx\csname date\languagename\endcsname\relax\else
    \if@filesw
      \ifx\babel@aux\@gobbletwo\else % Set if single in the first, redundant
        \bbl@savelastskip
        \protected@write\@auxout{}{\string\babel@aux{\bbl@auxname}{}}%
        \bbl@restorelastskip
      \fi
      \bbl@usehooks{write}{}%
    \fi
  \fi}
%
\let\bbl@restorelastskip\relax
\def\bbl@savelastskip{%
  \let\bbl@restorelastskip\relax
  \ifvmode
    \ifdim\lastskip=\z@
      \let\bbl@restorelastskip\nobreak
    \else
      \bbl@exp{%
        \def\\\bbl@restorelastskip{%
          \skip@=\the\lastskip
          \\\nobreak \vskip-\skip@ \vskip\skip@}}%
    \fi
  \fi}
%
\newif\ifbbl@bcpallowed
\bbl@bcpallowedfalse
\def\select@language#1{% from set@, babel@aux
  % set hymap
  \ifnum\bbl@hymapsel=\@cclv\chardef\bbl@hymapsel4\relax\fi
  % set name
  \edef\languagename{#1}%
  \bbl@fixname\languagename
  % TODO. name@map must be here?
  \bbl@provide@locale
  \bbl@iflanguage\languagename{%
     \expandafter\ifx\csname date\languagename\endcsname\relax
      \bbl@error
        {Unknown language '\languagename'. Either you have\\%
         misspelled its name, it has not been installed,\\%
         or you requested it in a previous run. Fix its name,\\%
         install it or just rerun the file, respectively. In\\%
         some cases, you may need to remove the aux file}%
        {You may proceed, but expect wrong results}%
    \else
      % set type
      \let\bbl@select@type\z@
      \expandafter\bbl@switch\expandafter{\languagename}%
    \fi}}
\def\babel@aux#1#2{% TODO. See how to avoid undefined nil's
  \select@language{#1}%
  \bbl@foreach\BabelContentsFiles{%
    \@writefile{##1}{\babel@toc{#1}{#2}}}}% %% TODO - ok in plain?
\def\babel@toc#1#2{%
  \select@language{#1}}
%    \end{macrocode}
%
%  \end{macro}
%
% First, check if the user asks for a known language. If so,
% update the value of |\language| and call |\originalTeX|
% to bring \TeX\ in a certain pre-defined state.
%
% The name of the language is stored in the control sequence
% |\languagename|.
%
% Then we have to \emph{re}define |\originalTeX| to compensate for
% the things that have been activated.  To save memory space for
% the macro definition of |\originalTeX|, we construct the control
% sequence name for the |\noextras|\langvar\ command at definition
% time by expanding the |\csname| primitive.
%
% Now activate the language-specific definitions. This is done by
% constructing the names of three macros by concatenating three
% words with the argument of |\selectlanguage|, and calling these
% macros. \nb{What if \cs{hyphenation} was used in |extras|? Patch
% temporarily |\set@hyphenmins| and hyphenation. It can be done in
% hooks if necessary.}
%
% The switching of the values of |\lefthyphenmin| and
% |\righthyphenmin| is somewhat different. First we save their
% current values, then we check if |\|\langvar|hyphenmins| is
% defined. If it is not, we set default values (2 and 3), otherwise
% the values in |\|\langvar|hyphenmins| will be used.
%
%    \begin{macrocode}
\newif\ifbbl@usedategroup
\def\bbl@switch#1{%  from select@, foreign@
  % make sure there is info for the language if so requested
  \bbl@ensureinfo{#1}%
  % restore
  \originalTeX
  \expandafter\def\expandafter\originalTeX\expandafter{%
    \csname noextras#1\endcsname
    \let\originalTeX\@empty
    \babel@beginsave}%
  \bbl@usehooks{afterreset}{}%
  \languageshorthands{none}%
  % set the locale id
  \bbl@id@assign
  % switch captions, date
  % No text is supposed to be added here, so we remove any
  % spurious spaces.  
  \bbl@bsphack
    \ifcase\bbl@select@type
      \csname captions#1\endcsname\relax
      \csname date#1\endcsname\relax
    \else
      \bbl@xin@{,captions,}{,\bbl@select@opts,}%
      \ifin@
        \csname captions#1\endcsname\relax
      \fi
      \bbl@xin@{,date,}{,\bbl@select@opts,}%
      \ifin@  % if \foreign... within \<lang>date
        \csname date#1\endcsname\relax
      \fi
    \fi
  \bbl@esphack
  % switch extras
  \bbl@usehooks{beforeextras}{}%
  \csname extras#1\endcsname\relax
  \bbl@usehooks{afterextras}{}%
  %  > babel-ensure
  %  > babel-sh-<short>
  %  > babel-bidi
  %  > babel-fontspec
  % hyphenation - case mapping
  \ifcase\bbl@opt@hyphenmap\or
    \def\BabelLower##1##2{\lccode##1=##2\relax}%
    \ifnum\bbl@hymapsel>4\else
      \csname\languagename @bbl@hyphenmap\endcsname
    \fi
    \chardef\bbl@opt@hyphenmap\z@
  \else
    \ifnum\bbl@hymapsel>\bbl@opt@hyphenmap\else
      \csname\languagename @bbl@hyphenmap\endcsname
    \fi
  \fi
  \let\bbl@hymapsel\@cclv
  % hyphenation - select rules
  \ifnum\csname l@\languagename\endcsname=\l@unhyphenated
    \edef\bbl@tempa{u}%
  \else
    \edef\bbl@tempa{\bbl@cl{lnbrk}}%
  \fi
  % linebreaking - handle u, e, k (v in the future)
  \bbl@xin@{/u}{/\bbl@tempa}%
  \ifin@\else\bbl@xin@{/e}{/\bbl@tempa}\fi % elongated forms 
  \ifin@\else\bbl@xin@{/k}{/\bbl@tempa}\fi % only kashida
  \ifin@\else\bbl@xin@{/v}{/\bbl@tempa}\fi % variable font
  \ifin@
    % unhyphenated/kashida/elongated = allow stretching
    \language\l@unhyphenated
    \babel@savevariable\emergencystretch
    \emergencystretch\maxdimen
    \babel@savevariable\hbadness
    \hbadness\@M
  \else
    % other = select patterns
    \bbl@patterns{#1}%
  \fi
  % hyphenation - mins
  \babel@savevariable\lefthyphenmin
  \babel@savevariable\righthyphenmin
  \expandafter\ifx\csname #1hyphenmins\endcsname\relax
    \set@hyphenmins\tw@\thr@@\relax
  \else
    \expandafter\expandafter\expandafter\set@hyphenmins
      \csname #1hyphenmins\endcsname\relax
  \fi}
%    \end{macrocode}
%
% \begin{environment}{otherlanguage}
% The \Lenv{otherlanguage} environment can be used as an
% alternative to using the |\selectlanguage| declarative
% command. When you are typesetting a document which mixes
% left-to-right and right-to-left typesetting you have to use this
% environment in order to let things work as you expect them to.
%
% The |\ignorespaces| command is necessary to hide the environment
% when it is entered in horizontal mode.
%
%    \begin{macrocode}
\long\def\otherlanguage#1{%
  \ifnum\bbl@hymapsel=\@cclv\let\bbl@hymapsel\thr@@\fi
  \csname selectlanguage \endcsname{#1}%
  \ignorespaces}
%    \end{macrocode}
%
% The |\endotherlanguage| part of the environment tries to hide
% itself when it is called in horizontal mode.
%
%    \begin{macrocode}
\long\def\endotherlanguage{%
  \global\@ignoretrue\ignorespaces}
%    \end{macrocode}
%
%  \end{environment}
%
% \begin{environment}{otherlanguage*}
% The \Lenv{otherlanguage} environment is meant to be used when a
% large part of text from a different language needs to be typeset,
% but without changing the translation of words such as `figure'.
% This environment makes use of |\foreign@language|.
%
%    \begin{macrocode}
\expandafter\def\csname otherlanguage*\endcsname{%
  \@ifnextchar[\bbl@otherlanguage@s{\bbl@otherlanguage@s[]}}
\def\bbl@otherlanguage@s[#1]#2{%
  \ifnum\bbl@hymapsel=\@cclv\chardef\bbl@hymapsel4\relax\fi
  \def\bbl@select@opts{#1}%
  \foreign@language{#2}}
%    \end{macrocode}
%
% At the end of the environment we need to switch off the extra
% definitions. The grouping mechanism of the environment will take
% care of resetting the correct hyphenation rules and ``extras''.
%
%    \begin{macrocode}
\expandafter\let\csname endotherlanguage*\endcsname\relax
%    \end{macrocode}
%
%  \end{environment}
%
% \begin{macro}{\foreignlanguage}
%
% The |\foreignlanguage| command is another substitute for the
% |\selectlanguage| command. This command takes two arguments, the
% first argument is the name of the language to use for typesetting
% the text specified in the second argument.
%
% Unlike |\selectlanguage| this command doesn't switch
% \emph{everything}, it only switches the hyphenation rules and the
% extra definitions for the language specified. It does this within
% a group and assumes the |\extras|\langvar\ command doesn't make
% any |\global| changes. The coding is very similar to part of
% |\selectlanguage|.
%
% |\bbl@beforeforeign| is a trick to fix a bug in bidi
% texts. |\foreignlanguage| is supposed to be a `text' command, and
% therefore it must emit a |\leavevmode|, but it does not, and
% therefore the indent is placed on the opposite margin. For
% backward compatibility, however, it is done only if a
% right-to-left script is requested; otherwise, it is no-op.
%
% (3.11) |\foreignlanguage*| is a temporary, experimental macro for
% a few lines with a different script direction, while preserving
% the paragraph format (thank the braces around |\par|, things like
% |\hangindent| are not reset). Do not use it in production,
% because its semantics and its syntax may change (and very likely
% will, or even it could be removed altogether). Currently it
% enters in vmode and then selects the language (which in turn sets the
% paragraph direction).
%
% (3.11) Also experimental are the hook |foreign| and |foreign*|.
% With them you can redefine |\BabelText| which by default does
% nothing. Its behavior is not well defined yet. So, use it in
% horizontal mode only if you do not want surprises.
%
% In other words, at the beginning of a paragraph |\foreignlanguage|
% enters into hmode with the surrounding lang, and with
% |\foreignlanguage*| with the new lang.
%
%    \begin{macrocode}
\providecommand\bbl@beforeforeign{}
\edef\foreignlanguage{%
  \noexpand\protect
  \expandafter\noexpand\csname foreignlanguage \endcsname}
\expandafter\def\csname foreignlanguage \endcsname{%
  \@ifstar\bbl@foreign@s\bbl@foreign@x}
\providecommand\bbl@foreign@x[3][]{%
  \begingroup
    \def\bbl@select@opts{#1}%
    \let\BabelText\@firstofone
    \bbl@beforeforeign
    \foreign@language{#2}%
    \bbl@usehooks{foreign}{}%
    \BabelText{#3}% Now in horizontal mode!
  \endgroup}
\def\bbl@foreign@s#1#2{% TODO - \shapemode, \@setpar, ?\@@par
  \begingroup
    {\par}%
    \let\bbl@select@opts\@empty
    \let\BabelText\@firstofone
    \foreign@language{#1}%
    \bbl@usehooks{foreign*}{}%
    \bbl@dirparastext
    \BabelText{#2}% Still in vertical mode!
    {\par}%
  \endgroup}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\foreign@language}
%
% This macro does the work for |\foreignlanguage| and the
% \Lenv{otherlanguage*} environment. First we need to store the name
% of the language and check that it is a known language. Then it
% just calls |bbl@switch|.
%
%    \begin{macrocode}
\def\foreign@language#1{%
  % set name
  \edef\languagename{#1}%
  \ifbbl@usedategroup
    \bbl@add\bbl@select@opts{,date,}%
    \bbl@usedategroupfalse
  \fi
  \bbl@fixname\languagename
  % TODO. name@map here?
  \bbl@provide@locale
  \bbl@iflanguage\languagename{%
    \expandafter\ifx\csname date\languagename\endcsname\relax
      \bbl@warning   % TODO - why a warning, not an error?
        {Unknown language '#1'. Either you have\\%
         misspelled its name, it has not been installed,\\%
         or you requested it in a previous run. Fix its name,\\%
         install it or just rerun the file, respectively. In\\%
         some cases, you may need to remove the aux file.\\%
         I'll proceed, but expect wrong results.\\%
         Reported}%
    \fi
    % set type
    \let\bbl@select@type\@ne
    \expandafter\bbl@switch\expandafter{\languagename}}}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\bbl@patterns}
%
% This macro selects the hyphenation patterns by changing the
% \cs{language} register.  If special hyphenation patterns
% are available specifically for the current font encoding,
% use them instead of the default.
%
% It also sets hyphenation exceptions, but only once, because they
% are global (here language |\lccode|'s has been set, too).
% |\bbl@hyphenation@| is set to relax until the very first
% |\babelhyphenation|, so do nothing with this value. If the
% exceptions for a language (by its number, not its name, so that
% |:ENC| is taken into account) has been set, then use
% |\hyphenation| with both global and language exceptions and empty
% the latter to mark they must not be set again.
%
%    \begin{macrocode}
\let\bbl@hyphlist\@empty
\let\bbl@hyphenation@\relax
\let\bbl@pttnlist\@empty
\let\bbl@patterns@\relax
\let\bbl@hymapsel=\@cclv
\def\bbl@patterns#1{%
  \language=\expandafter\ifx\csname l@#1:\f@encoding\endcsname\relax
      \csname l@#1\endcsname
      \edef\bbl@tempa{#1}%
    \else
      \csname l@#1:\f@encoding\endcsname
      \edef\bbl@tempa{#1:\f@encoding}%
    \fi
  \@expandtwoargs\bbl@usehooks{patterns}{{#1}{\bbl@tempa}}%
  %  > luatex
  \@ifundefined{bbl@hyphenation@}{}{% Can be \relax!
    \begingroup
      \bbl@xin@{,\number\language,}{,\bbl@hyphlist}%
      \ifin@\else
        \@expandtwoargs\bbl@usehooks{hyphenation}{{#1}{\bbl@tempa}}%
        \hyphenation{%
          \bbl@hyphenation@
          \@ifundefined{bbl@hyphenation@#1}%
            \@empty
            {\space\csname bbl@hyphenation@#1\endcsname}}%
        \xdef\bbl@hyphlist{\bbl@hyphlist\number\language,}%
      \fi
    \endgroup}}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{environment}{hyphenrules}
%
% The environment \Lenv{hyphenrules} can be used to select
% \emph{just} the hyphenation rules. This environment does
% \emph{not} change |\languagename| and when the hyphenation rules
% specified were not loaded it has no effect. Note however,
% |\lccode|'s and font encodings are not set at all, so in most
% cases you should use |otherlanguage*|.
%
%    \begin{macrocode}
\def\hyphenrules#1{%
  \edef\bbl@tempf{#1}%
  \bbl@fixname\bbl@tempf
  \bbl@iflanguage\bbl@tempf{%
    \expandafter\bbl@patterns\expandafter{\bbl@tempf}%
    \ifx\languageshorthands\@undefined\else
      \languageshorthands{none}%
    \fi
    \expandafter\ifx\csname\bbl@tempf hyphenmins\endcsname\relax
      \set@hyphenmins\tw@\thr@@\relax
    \else
      \expandafter\expandafter\expandafter\set@hyphenmins
      \csname\bbl@tempf hyphenmins\endcsname\relax
    \fi}}
\let\endhyphenrules\@empty
%    \end{macrocode}
%
%  \end{environment}
%
% \begin{macro}{\providehyphenmins}
% The macro |\providehyphenmins| should be used in the language
% definition files to provide a \emph{default} setting for the
% hyphenation parameters |\lefthyphenmin| and |\righthyphenmin|. If
% the macro |\|\langvar|hyphenmins| is already defined this command
% has no effect.
%
%    \begin{macrocode}
\def\providehyphenmins#1#2{%
  \expandafter\ifx\csname #1hyphenmins\endcsname\relax
    \@namedef{#1hyphenmins}{#2}%
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\set@hyphenmins}
%    This macro sets the values of |\lefthyphenmin| and
%    |\righthyphenmin|. It expects two values as its argument.
%
%    \begin{macrocode}
\def\set@hyphenmins#1#2{%
  \lefthyphenmin#1\relax
  \righthyphenmin#2\relax}
%    \end{macrocode}
%
% \end{macro}
%
% \begin{macro}{\ProvidesLanguage}
% The identification code for each file is something that was
% introduced in \LaTeXe. When the command |\ProvidesFile| does not
% exist, a dummy definition is provided temporarily. For use in the
% language definition file the command |\ProvidesLanguage| is
% defined by \babel.
%
% Depending on the format, ie, on if the former is defined, we use
% a similar definition or not.
%
%    \begin{macrocode}
\ifx\ProvidesFile\@undefined
  \def\ProvidesLanguage#1[#2 #3 #4]{%
    \wlog{Language: #1 #4 #3 <#2>}%
    }
\else
  \def\ProvidesLanguage#1{%
    \begingroup
      \catcode`\ 10 %
      \@makeother\/%
      \@ifnextchar[%]
        {\@provideslanguage{#1}}{\@provideslanguage{#1}[]}}
  \def\@provideslanguage#1[#2]{%
    \wlog{Language: #1 #2}%
    \expandafter\xdef\csname ver@#1.ldf\endcsname{#2}%
    \endgroup}
\fi
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\originalTeX}
%    The macro|\originalTeX| should be known to \TeX\ at this moment.
%    As it has to be expandable we |\let| it to |\@empty| instead of
%    |\relax|.
%
%    \begin{macrocode}
\ifx\originalTeX\@undefined\let\originalTeX\@empty\fi
%    \end{macrocode}
%
%    Because this part of the code can be included in a format, we
%    make sure that the macro which initializes the save mechanism,
%    |\babel@beginsave|, is not considered to be undefined.
%
%    \begin{macrocode}
\ifx\babel@beginsave\@undefined\let\babel@beginsave\relax\fi
%    \end{macrocode}
%
%  \end{macro}
%
% A few macro names are reserved for future releases of \babel, which
% will use the concept of `locale':
%
%    \begin{macrocode}
\providecommand\setlocale{%
  \bbl@error
    {Not yet available}%
    {Find an armchair, sit down and wait}}
\let\uselocale\setlocale
\let\locale\setlocale
\let\selectlocale\setlocale
\let\localename\setlocale
\let\textlocale\setlocale
\let\textlanguage\setlocale
\let\languagetext\setlocale
%    \end{macrocode}
%
% \subsection{Errors}
%
% \begin{macro}{\@nolanerr}
% \begin{macro}{\@nopatterns}
%
% The \babel\ package will signal an error when a documents tries
% to select a language that hasn't been defined earlier. When a
% user selects a language for which no hyphenation patterns were
% loaded into the format he will be given a warning about that
% fact. We revert to the patterns for |\language|=0 in that case.
% In most formats that will be (US)english, but it might also be
% empty.
%
% \begin{macro}{\@noopterr}
% When the package was loaded without options not everything will
% work as expected. An error message is issued in that case.
%
% When the format knows about |\PackageError| it must be \LaTeXe,
% so we can safely use its error handling interface. Otherwise
% we'll have to `keep it simple'.
%
% Infos are not written to the console, but on the other hand many
% people think warnings are errors, so a further message type is
% defined: an important info which is sent to the console.
%
%    \begin{macrocode}
\edef\bbl@nulllanguage{\string\language=0}
\ifx\PackageError\@undefined  % TODO. Move to Plain
  \def\bbl@error#1#2{%
    \begingroup
      \newlinechar=`\^^J
      \def\\{^^J(babel) }%
      \errhelp{#2}\errmessage{\\#1}%
    \endgroup}
  \def\bbl@warning#1{%
    \begingroup
      \newlinechar=`\^^J
      \def\\{^^J(babel) }%
      \message{\\#1}%
    \endgroup}
  \let\bbl@infowarn\bbl@warning
  \def\bbl@info#1{%
    \begingroup
      \newlinechar=`\^^J
      \def\\{^^J}%
      \wlog{#1}%
    \endgroup}
\fi
\def\bbl@nocaption{\protect\bbl@nocaption@i}
\def\bbl@nocaption@i#1#2{% 1: text to be printed 2: caption macro \langXname
  \global\@namedef{#2}{\textbf{?#1?}}%
  \@nameuse{#2}%
  \edef\bbl@tempa{#1}%
  \bbl@sreplace\bbl@tempa{name}{}%
  \bbl@warning{% TODO.
    \@backslashchar#1 not set for '\languagename'. Please,\\%
    define it after the language has been loaded\\%
    (typically in the preamble) with:\\% 
    \string\setlocalecaption{\languagename}{\bbl@tempa}{..}\\%
    Reported}}
\def\bbl@tentative{\protect\bbl@tentative@i}
\def\bbl@tentative@i#1{%
  \bbl@warning{%
    Some functions for '#1' are tentative.\\%
    They might not work as expected and their behavior\\%
    could change in the future.\\%
    Reported}}
\def\@nolanerr#1{%
  \bbl@error
    {You haven't defined the language '#1' yet.\\%
     Perhaps you misspelled it or your installation\\%
     is not complete}%
    {Your command will be ignored, type <return> to proceed}}
\def\@nopatterns#1{%
  \bbl@warning
    {No hyphenation patterns were preloaded for\\%
     the language '#1' into the format.\\%
     Please, configure your TeX system to add them and\\%
     rebuild the format. Now I will use the patterns\\%
     preloaded for \bbl@nulllanguage\space instead}}
\let\bbl@usehooks\@gobbletwo
\ifx\bbl@onlyswitch\@empty\endinput\fi
  % Here ended switch.def
%    \end{macrocode}
%
% Here ended |switch.def|.
%
%    \begin{macrocode}
\ifx\directlua\@undefined\else
  \ifx\bbl@luapatterns\@undefined
    \input luababel.def
  \fi
\fi
<@Basic macros@>
\bbl@trace{Compatibility with language.def}
\ifx\bbl@languages\@undefined
  \ifx\directlua\@undefined
    \openin1 = language.def % TODO. Remove hardcoded number
    \ifeof1
      \closein1
      \message{I couldn't find the file language.def}
    \else
      \closein1
      \begingroup
        \def\addlanguage#1#2#3#4#5{%
          \expandafter\ifx\csname lang@#1\endcsname\relax\else
            \global\expandafter\let\csname l@#1\expandafter\endcsname
              \csname lang@#1\endcsname
          \fi}%
        \def\uselanguage#1{}%
        \input language.def
      \endgroup
    \fi
  \fi
  \chardef\l@english\z@
\fi
%    \end{macrocode}
%
%  \begin{macro}{\addto}
% It takes two arguments, a \meta{control sequence} and \TeX-code to
% be added to the \meta{control sequence}.
%
% If the \meta{control sequence} has not been defined before it is
% defined now.  The control sequence could also expand to |\relax|,
% in which case a circular definition results. The net result is a
% stack overflow.  Note there is an inconsistency, because the
% assignment in the last branch is global. 
%
%    \begin{macrocode}
\def\addto#1#2{%
  \ifx#1\@undefined
    \def#1{#2}%
  \else
    \ifx#1\relax
      \def#1{#2}%
    \else
      {\toks@\expandafter{#1#2}%
       \xdef#1{\the\toks@}}%
    \fi
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
% The macro |\initiate@active@char| below takes all the necessary
% actions to make its argument a shorthand character. The real work
% is performed once for each character. But first we define a little
% tool. TODO. Always used with additional expansions. Move them here?
% Move the macro to basic?
%
%    \begin{macrocode}
\def\bbl@withactive#1#2{%
  \begingroup
    \lccode`~=`#2\relax
    \lowercase{\endgroup#1~}}
%    \end{macrocode}
%
%  \begin{macro}{\bbl@redefine}
%
% To redefine a command, we save the old meaning of the macro. Then
% we redefine it to call the original macro with the `sanitized'
% argument. The reason why we do it this way is that we don't want
% to redefine the \LaTeX\ macros completely in case their
% definitions change (they have changed in the past). A macro named
% |\macro| will be saved new control sequences named |\org@macro|.
%
%    \begin{macrocode}
\def\bbl@redefine#1{%
  \edef\bbl@tempa{\bbl@stripslash#1}%
  \expandafter\let\csname org@\bbl@tempa\endcsname#1%
  \expandafter\def\csname\bbl@tempa\endcsname}
\@onlypreamble\bbl@redefine
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@redefine@long}
%    This version of |\babel@redefine| can be used to redefine |\long|
%    commands such as |\ifthenelse|.
%
%    \begin{macrocode}
\def\bbl@redefine@long#1{%
  \edef\bbl@tempa{\bbl@stripslash#1}%
  \expandafter\let\csname org@\bbl@tempa\endcsname#1%
  \expandafter\long\expandafter\def\csname\bbl@tempa\endcsname}
\@onlypreamble\bbl@redefine@long
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\bbl@redefinerobust}
% For commands that are redefined, but which \textit{might} be
% robust we need a slightly more intelligent macro. A robust
% command |foo| is defined to expand to |\protect|\verb*|\foo |. So
% it is necessary to check whether \verb*|\foo | exists. The result
% is that the command that is being redefined is always robust
% afterwards.  Therefore all we need to do now is define \verb*|\foo |.
%
%    \begin{macrocode}
\def\bbl@redefinerobust#1{%
  \edef\bbl@tempa{\bbl@stripslash#1}%
  \bbl@ifunset{\bbl@tempa\space}%
    {\expandafter\let\csname org@\bbl@tempa\endcsname#1%
     \bbl@exp{\def\\#1{\\\protect\<\bbl@tempa\space>}}}%
    {\bbl@exp{\let\<org@\bbl@tempa>\<\bbl@tempa\space>}}%
    \@namedef{\bbl@tempa\space}}
\@onlypreamble\bbl@redefinerobust
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Hooks}
%
% Admittedly, the current implementation is a somewhat simplistic and
% does very little to catch errors, but it is meant for developers,
% after all. |\bbl@usehooks| is the commands used by \babel{} to execute
% hooks defined for an event.
%
%    \begin{macrocode}
\bbl@trace{Hooks}
\newcommand\AddBabelHook[3][]{%
  \bbl@ifunset{bbl@hk@#2}{\EnableBabelHook{#2}}{}%
  \def\bbl@tempa##1,#3=##2,##3\@empty{\def\bbl@tempb{##2}}%
  \expandafter\bbl@tempa\bbl@evargs,#3=,\@empty
  \bbl@ifunset{bbl@ev@#2@#3@#1}%
    {\bbl@csarg\bbl@add{ev@#3@#1}{\bbl@elth{#2}}}%
    {\bbl@csarg\let{ev@#2@#3@#1}\relax}%
  \bbl@csarg\newcommand{ev@#2@#3@#1}[\bbl@tempb]}
\newcommand\EnableBabelHook[1]{\bbl@csarg\let{hk@#1}\@firstofone}
\newcommand\DisableBabelHook[1]{\bbl@csarg\let{hk@#1}\@gobble}
\def\bbl@usehooks#1#2{%
  \def\bbl@elth##1{%
    \bbl@cs{hk@##1}{\bbl@cs{ev@##1@#1@}#2}}%
  \bbl@cs{ev@#1@}%
  \ifx\languagename\@undefined\else % Test required for Plain (?)
    \def\bbl@elth##1{%
      \bbl@cs{hk@##1}{\bbl@cl{ev@##1@#1}#2}}%
    \bbl@cl{ev@#1}%
  \fi}
%    \end{macrocode}
%
% To ensure forward compatibility, arguments in hooks are set
% implicitly. So, if a further argument is added in the future,
% there is no need to change the existing code. Note events
% intended for \textsf{hyphen.cfg} are also loaded (just in
% case you need them for some reason).
%
%    \begin{macrocode}
\def\bbl@evargs{,% <- don't delete this comma
  everylanguage=1,loadkernel=1,loadpatterns=1,loadexceptions=1,%
  adddialect=2,patterns=2,defaultcommands=0,encodedcommands=2,write=0,%
  beforeextras=0,afterextras=0,stopcommands=0,stringprocess=0,%
  hyphenation=2,initiateactive=3,afterreset=0,foreign=0,foreign*=0,%
  beforestart=0,languagename=2}
%    \end{macrocode}
%
% \begin{macro}{\babelensure}
%
% The user command just parses the optional argument and creates a
% new macro named |\bbl@e@|\m{language}. We register a hook at the
% |afterextras| event which just executes this macro in a
% ``complete'' selection (which, if undefined, is |\relax| and does
% nothing). This part is somewhat involved because we have to make
% sure things are expanded the correct number of times.
%
% The macro |\bbl@e@|\m{language} contains
% |\bbl@ensure|\marg{include}\marg{exclude}\marg{fontenc}, which in in
% turn loops over the macros names in |\bbl@captionslist|, excluding
% (with the help of |\in@|) those in the |exclude| list. If the
% |fontenc| is given (and not |\relax|), the |\fontencoding| is also
% added. Then we loop over the |include| list, but if the macro
% already contains |\foreignlanguage|, nothing is done.  Note this
% macro (1) is not restricted to the preamble, and (2) changes are
% local.
%
%    \begin{macrocode}
\bbl@trace{Defining babelensure}
\newcommand\babelensure[2][]{%  TODO - revise test files
  \AddBabelHook{babel-ensure}{afterextras}{%
    \ifcase\bbl@select@type
      \bbl@cl{e}%
    \fi}%
  \begingroup
    \let\bbl@ens@include\@empty
    \let\bbl@ens@exclude\@empty
    \def\bbl@ens@fontenc{\relax}%
    \def\bbl@tempb##1{%
      \ifx\@empty##1\else\noexpand##1\expandafter\bbl@tempb\fi}%
    \edef\bbl@tempa{\bbl@tempb#1\@empty}%
    \def\bbl@tempb##1=##2\@@{\@namedef{bbl@ens@##1}{##2}}%
    \bbl@foreach\bbl@tempa{\bbl@tempb##1\@@}%
    \def\bbl@tempc{\bbl@ensure}%
    \expandafter\bbl@add\expandafter\bbl@tempc\expandafter{%
      \expandafter{\bbl@ens@include}}%
    \expandafter\bbl@add\expandafter\bbl@tempc\expandafter{%
      \expandafter{\bbl@ens@exclude}}%
    \toks@\expandafter{\bbl@tempc}%
    \bbl@exp{%
  \endgroup
  \def\<bbl@e@#2>{\the\toks@{\bbl@ens@fontenc}}}}
\def\bbl@ensure#1#2#3{% 1: include 2: exclude 3: fontenc
  \def\bbl@tempb##1{% elt for (excluding) \bbl@captionslist list
    \ifx##1\@undefined % 3.32 - Don't assume the macro exists
      \edef##1{\noexpand\bbl@nocaption
        {\bbl@stripslash##1}{\languagename\bbl@stripslash##1}}%
    \fi
    \ifx##1\@empty\else
      \in@{##1}{#2}%
      \ifin@\else
        \bbl@ifunset{bbl@ensure@\languagename}%
          {\bbl@exp{%
            \\\DeclareRobustCommand\<bbl@ensure@\languagename>[1]{%
              \\\foreignlanguage{\languagename}%
              {\ifx\relax#3\else
                \\\fontencoding{#3}\\\selectfont
               \fi
               ########1}}}}%
          {}%
        \toks@\expandafter{##1}%
        \edef##1{%
           \bbl@csarg\noexpand{ensure@\languagename}%
           {\the\toks@}}%
      \fi
      \expandafter\bbl@tempb
    \fi}%
  \expandafter\bbl@tempb\bbl@captionslist\today\@empty
  \def\bbl@tempa##1{% elt for include list
    \ifx##1\@empty\else
      \bbl@csarg\in@{ensure@\languagename\expandafter}\expandafter{##1}%
      \ifin@\else
        \bbl@tempb##1\@empty
      \fi
      \expandafter\bbl@tempa
    \fi}%
  \bbl@tempa#1\@empty}
\def\bbl@captionslist{%
  \prefacename\refname\abstractname\bibname\chaptername\appendixname
  \contentsname\listfigurename\listtablename\indexname\figurename
  \tablename\partname\enclname\ccname\headtoname\pagename\seename
  \alsoname\proofname\glossaryname}
%    \end{macrocode}
%
%    \end{macro}
%
% \subsection{Setting up language files}
%
% \begin{macro}{\LdfInit}
%
% |\LdfInit| macro takes two arguments. The first
% argument is the name of the language that will be defined in the
% language definition file; the second argument is either a control
% sequence or a string from which a control sequence should be
% constructed. The existence of the control sequence indicates that
% the file has been processed before.
%
% At the start of processing a language definition file we always
% check the category code of the at-sign. We make sure that it is
% a `letter' during the processing of the file. We also save its
% name as the last called option, even if not loaded.
%
% Another character that needs to have the correct category code
% during processing of language definition files is the equals sign,
% `=', because it is sometimes used in constructions with the
% |\let| primitive. Therefore we store its current catcode and
% restore it later on.
%
% Now we check whether we should perhaps stop the processing of
% this file. To do this we first need to check whether the second
% argument that is passed to |\LdfInit| is a control sequence. We
% do that by looking at the first token after passing |#2| through
% |string|. When it is equal to |\@backslashchar| we are dealing
% with a control sequence which we can compare with |\@undefined|.
%
% If so, we call |\ldf@quit| to set the main language, restore the
% category code of the @-sign and call |\endinput|
%
% When |#2| was \emph{not} a control sequence we construct one and
% compare it with |\relax|.
%
% Finally we check |\originalTeX|.
%
%    \begin{macrocode}
\bbl@trace{Macros for setting language files up}
\def\bbl@ldfinit{%
  \let\bbl@screset\@empty
  \let\BabelStrings\bbl@opt@string
  \let\BabelOptions\@empty
  \let\BabelLanguages\relax
  \ifx\originalTeX\@undefined
    \let\originalTeX\@empty
  \else
    \originalTeX
  \fi}
\def\LdfInit#1#2{%
  \chardef\atcatcode=\catcode`\@
  \catcode`\@=11\relax
  \chardef\eqcatcode=\catcode`\=
  \catcode`\==12\relax
  \expandafter\if\expandafter\@backslashchar
                 \expandafter\@car\string#2\@nil
    \ifx#2\@undefined\else
      \ldf@quit{#1}%
    \fi
  \else
    \expandafter\ifx\csname#2\endcsname\relax\else
      \ldf@quit{#1}%
    \fi
  \fi
  \bbl@ldfinit}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\ldf@quit}
%    This macro interrupts the processing of a language definition file.
%
%    \begin{macrocode}
\def\ldf@quit#1{%
  \expandafter\main@language\expandafter{#1}%
  \catcode`\@=\atcatcode \let\atcatcode\relax
  \catcode`\==\eqcatcode \let\eqcatcode\relax
  \endinput}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\ldf@finish}
%    This macro takes one argument. It is the name of the language
%    that was defined in the language definition file.
%
%    We load the local configuration file if one is present, we set
%    the main language (taking into account that the argument might be
%    a control sequence that needs to be expanded) and reset the
%    category code of the @-sign.
%
%    \begin{macrocode}
\def\bbl@afterldf#1{% TODO. Merge into the next macro? Unused elsewhere
  \bbl@afterlang
  \let\bbl@afterlang\relax
  \let\BabelModifiers\relax
  \let\bbl@screset\relax}%
\def\ldf@finish#1{%
  \ifx\loadlocalcfg\@undefined\else % For LaTeX 209
    \loadlocalcfg{#1}%
  \fi
  \bbl@afterldf{#1}%
  \expandafter\main@language\expandafter{#1}%
  \catcode`\@=\atcatcode \let\atcatcode\relax
  \catcode`\==\eqcatcode \let\eqcatcode\relax}
%    \end{macrocode}
%
%  \end{macro}
%
%    After the preamble of the document the commands |\LdfInit|,
%    |\ldf@quit| and |\ldf@finish| are no longer needed. Therefore
%    they are turned into warning messages in \LaTeX.
%
%    \begin{macrocode}
\@onlypreamble\LdfInit
\@onlypreamble\ldf@quit
\@onlypreamble\ldf@finish
%    \end{macrocode}
%
%  \begin{macro}{\main@language}
%  \begin{macro}{\bbl@main@language}
%    This command should be used in the various language definition
%    files. It stores its argument in |\bbl@main@language|; to be used
%    to switch to the correct language at the beginning of the
%    document.
%
%    \begin{macrocode}
\def\main@language#1{%
  \def\bbl@main@language{#1}%
  \let\languagename\bbl@main@language % TODO. Set localename
  \bbl@id@assign
  \bbl@patterns{\languagename}}
%    \end{macrocode}
%
% We also have to make sure that some code gets executed at the
% beginning of the document, either when the |aux| file is read or,
% if it does not exist, when the |\AtBeginDocument| is executed.
% Languages do not set |\pagedir|, so we set here for the whole
% document to the main |\bodydir|.
%
%    \begin{macrocode}
\def\bbl@beforestart{%
  \bbl@usehooks{beforestart}{}%
  \global\let\bbl@beforestart\relax}
\AtBeginDocument{%
  \@nameuse{bbl@beforestart}%
  \if@filesw
    \providecommand\babel@aux[2]{}%
    \immediate\write\@mainaux{%
      \string\providecommand\string\babel@aux[2]{}}%
    \immediate\write\@mainaux{\string\@nameuse{bbl@beforestart}}%
  \fi
  \expandafter\selectlanguage\expandafter{\bbl@main@language}%
  \ifbbl@single  % must go after the line above.
    \renewcommand\selectlanguage[1]{}%
    \renewcommand\foreignlanguage[2]{#2}%
    \global\let\babel@aux\@gobbletwo  % Also as flag
  \fi
  \ifcase\bbl@engine\or\pagedir\bodydir\fi} % TODO - a better place
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% A bit of optimization. Select in heads/foots the language only if
% necessary.
%
%    \begin{macrocode}
\def\select@language@x#1{%
  \ifcase\bbl@select@type
    \bbl@ifsamestring\languagename{#1}{}{\select@language{#1}}%
  \else
    \select@language{#1}%
  \fi}
%    \end{macrocode}
%
% \subsection{Shorthands}
%
%  \begin{macro}{\bbl@add@special}
%    The macro |\bbl@add@special| is used to add a new character (or
%    single character control sequence) to the macro |\dospecials|
%    (and |\@sanitize| if \LaTeX\ is used). It is used only at one
%    place, namely when |\initiate@active@char| is called (which is
%    ignored if the char has been made active before).  Because
%    |\@sanitize| can be undefined, we put the definition inside a
%    conditional.
%
%    Items are added to the lists without checking its existence or
%    the original catcode. It does not hurt, but should be fixed. It's
%    already done with |\nfss@catcodes|, added in 3.10.
%
%    \begin{macrocode}
\bbl@trace{Shorhands}
\def\bbl@add@special#1{% 1:a macro like \", \?, etc.
  \bbl@add\dospecials{\do#1}% test @sanitize = \relax, for back. compat.
  \bbl@ifunset{@sanitize}{}{\bbl@add\@sanitize{\@makeother#1}}%
  \ifx\nfss@catcodes\@undefined\else % TODO - same for above
    \begingroup
      \catcode`#1\active
      \nfss@catcodes
      \ifnum\catcode`#1=\active
        \endgroup
        \bbl@add\nfss@catcodes{\@makeother#1}%
      \else
        \endgroup
      \fi
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@remove@special}
%
%    The companion of the former macro is |\bbl@remove@special|.  It
%    removes a character from the set macros |\dospecials| and
%    |\@sanitize|, but it is not used at all in the \babel{} core.
%
%    \begin{macrocode}
\def\bbl@remove@special#1{%
  \begingroup
    \def\x##1##2{\ifnum`#1=`##2\noexpand\@empty
                 \else\noexpand##1\noexpand##2\fi}%
    \def\do{\x\do}%
    \def\@makeother{\x\@makeother}%
  \edef\x{\endgroup
    \def\noexpand\dospecials{\dospecials}%
    \expandafter\ifx\csname @sanitize\endcsname\relax\else
      \def\noexpand\@sanitize{\@sanitize}%
    \fi}%
  \x}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\initiate@active@char}
%    A language definition file can call this macro to make a
%    character active. This macro takes one argument, the character
%    that is to be made active. When the character was already active
%    this macro does nothing. Otherwise, this macro defines the
%    control sequence |\normal@char|\m{char} to expand to the
%    character in its `normal state' and it defines the active
%    character to expand to |\normal@char|\m{char} by default
%    (\m{char} being the character to be made active). Later its
%    definition can be changed to expand to |\active@char|\m{char}
%    by calling |\bbl@activate{|\m{char}|}|.
%
%    For example, to make the double quote character active one could
%    have |\initiate@active@char{"}| in a language definition file.
%    This defines |"| as |\active@prefix "\active@char"| (where the
%    first |"| is the character with its original catcode, when the
%    shorthand is created, and |\active@char"| is a single token). In
%    protected contexts, it expands to |\protect "| or |\noexpand "|
%    (ie, with the original |"|); otherwise |\active@char"| is
%    executed. This macro in turn expands to |\normal@char"| in
%    ``safe'' contexts (eg, |\label|), but |\user@active"| in normal
%    ``unsafe'' ones. The latter search a definition in the user,
%    language and system levels, in this order, but if none is found,
%    |\normal@char"| is used.  However, a deactivated shorthand (with
%    |\bbl@deactivate| is defined as |\active@prefix "\normal@char"|.
%
%    The following macro is used to define shorthands in the three
%    levels. It takes 4 arguments: the (string'ed) character,
%    |\<level>@group|, |<level>@active| and |<next-level>@active|
%    (except in |system|).
%
%    \begin{macrocode}
\def\bbl@active@def#1#2#3#4{%
  \@namedef{#3#1}{%
    \expandafter\ifx\csname#2@sh@#1@\endcsname\relax
      \bbl@afterelse\bbl@sh@select#2#1{#3@arg#1}{#4#1}%
    \else
      \bbl@afterfi\csname#2@sh@#1@\endcsname
    \fi}%
%    \end{macrocode}
%
%    When there is also no current-level shorthand with an argument we
%    will check whether there is a next-level  defined shorthand for
%    this active character.
%
%    \begin{macrocode}
  \long\@namedef{#3@arg#1}##1{%
    \expandafter\ifx\csname#2@sh@#1@\string##1@\endcsname\relax
      \bbl@afterelse\csname#4#1\endcsname##1%
    \else
      \bbl@afterfi\csname#2@sh@#1@\string##1@\endcsname
    \fi}}%
%    \end{macrocode}
%
%    |\initiate@active@char| calls |\@initiate@active@char| with 3
%    arguments. All of them are the same character with different
%    catcodes: active, other (|\string|'ed) and the original one.
%    This trick simplifies the code a lot.
%
%    \begin{macrocode}
\def\initiate@active@char#1{%
  \bbl@ifunset{active@char\string#1}%
    {\bbl@withactive
      {\expandafter\@initiate@active@char\expandafter}#1\string#1#1}%
    {}}
%    \end{macrocode}
%
%   The very first thing to do is saving the original catcode and the
%   original definition, even if not active, which is possible
%   (undefined characters require a special treatement to avoid
%   making them |\relax| and preserving some degree of protection).
%
%    \begin{macrocode}
\def\@initiate@active@char#1#2#3{%
  \bbl@csarg\edef{oricat@#2}{\catcode`#2=\the\catcode`#2\relax}%
  \ifx#1\@undefined
    \bbl@csarg\def{oridef@#2}{\def#1{\active@prefix#1\@undefined}}%
  \else
    \bbl@csarg\let{oridef@@#2}#1%
    \bbl@csarg\edef{oridef@#2}{%
      \let\noexpand#1%
      \expandafter\noexpand\csname bbl@oridef@@#2\endcsname}%
  \fi
%    \end{macrocode}
%
%    If the character is already active we provide the default
%    expansion under this shorthand mechanism. Otherwise we write a
%    message in the transcript file, and define |\normal@char|\m{char}
%    to expand to the character in its default state. If the character
%    is mathematically active when \babel{} is loaded (for example
%    |'|) the normal expansion is somewhat different to avoid an
%    infinite loop (but it does not prevent the loop if the mathcode
%    is set to |"8000| \textit{a posteriori}).
%
%    \begin{macrocode}
  \ifx#1#3\relax
    \expandafter\let\csname normal@char#2\endcsname#3%
  \else
    \bbl@info{Making #2 an active character}%
    \ifnum\mathcode`#2=\ifodd\bbl@engine"1000000 \else"8000 \fi
      \@namedef{normal@char#2}{%
        \textormath{#3}{\csname bbl@oridef@@#2\endcsname}}%
    \else
      \@namedef{normal@char#2}{#3}%
    \fi
%    \end{macrocode}
%
%    To prevent problems with the loading of other packages after
%    \babel\ we reset the catcode of the character to the original one
%    at the end of the package and of each language file (except with
%    \textsf{KeepShorthandsActive}). It is re-activate again at
%    |\begin{document}|.  We also need to make sure that the
%    shorthands are active during the processing of the \file{.aux}
%    file. Otherwise some citations may give unexpected results in
%    the printout when a shorthand was used in the optional argument
%    of |\bibitem| for example. Then we make it active (not strictly
%    necessary, but done for backward compatibility).
%
%    \begin{macrocode}
    \bbl@restoreactive{#2}%
    \AtBeginDocument{%
      \catcode`#2\active
      \if@filesw
        \immediate\write\@mainaux{\catcode`\string#2\active}%
      \fi}%
    \expandafter\bbl@add@special\csname#2\endcsname
    \catcode`#2\active
  \fi
%    \end{macrocode}
%
%    Now we have set |\normal@char|\m{char}, we must define
%    |\active@char|\m{char}, to be executed when the character is
%    activated.  We define the first level expansion of
%    |\active@char|\m{char} to check the status of the |@safe@actives|
%    flag. If it is set to true we expand to the `normal' version of
%    this character, otherwise we call |\user@active|\m{char} to start
%    the search of a definition in the user, language and system
%    levels (or eventually |normal@char|\m{char}).
%
%    \begin{macrocode}
  \let\bbl@tempa\@firstoftwo
  \if\string^#2%
    \def\bbl@tempa{\noexpand\textormath}%
  \else
    \ifx\bbl@mathnormal\@undefined\else
      \let\bbl@tempa\bbl@mathnormal
    \fi
  \fi
  \expandafter\edef\csname active@char#2\endcsname{%
    \bbl@tempa
      {\noexpand\if@safe@actives
         \noexpand\expandafter
         \expandafter\noexpand\csname normal@char#2\endcsname
       \noexpand\else
         \noexpand\expandafter
         \expandafter\noexpand\csname bbl@doactive#2\endcsname
       \noexpand\fi}%
     {\expandafter\noexpand\csname normal@char#2\endcsname}}%
  \bbl@csarg\edef{doactive#2}{%
    \expandafter\noexpand\csname user@active#2\endcsname}%
%    \end{macrocode}
%
%    We now define the default values which the shorthand is set to
%    when activated or deactivated. It is set to the deactivated form
%    (globally), so that the character expands to
%    \begin{center}
%    |\active@prefix| \m{char} |\normal@char|\m{char}
%    \end{center}
%    (where |\active@char|\m{char} is \emph{one} control sequence!).
%
%    \begin{macrocode}
  \bbl@csarg\edef{active@#2}{%
    \noexpand\active@prefix\noexpand#1%
    \expandafter\noexpand\csname active@char#2\endcsname}%
  \bbl@csarg\edef{normal@#2}{%
    \noexpand\active@prefix\noexpand#1%
    \expandafter\noexpand\csname normal@char#2\endcsname}%
  \expandafter\let\expandafter#1\csname bbl@normal@#2\endcsname
%    \end{macrocode}
%
%    The next level of the code checks whether a user has defined a
%    shorthand for himself with this character. First we check for a
%    single character shorthand. If that doesn't exist we check for a
%    shorthand with an argument.
%
%    \begin{macrocode}
  \bbl@active@def#2\user@group{user@active}{language@active}%
  \bbl@active@def#2\language@group{language@active}{system@active}%
  \bbl@active@def#2\system@group{system@active}{normal@char}%
%    \end{macrocode}
%
%    In order to do the right thing when a shorthand with an argument
%    is used by itself at the end of the line we provide a definition
%    for the case of an empty argument. For that case we let the
%    shorthand character expand to its non-active self. Also, When a
%    shorthand combination such as |''| ends up in a heading \TeX\
%    would see |\protect'\protect'|. To prevent this from happening a
%    couple of shorthand needs to be defined at user level.
%
%    \begin{macrocode}
  \expandafter\edef\csname\user@group @sh@#2@@\endcsname
    {\expandafter\noexpand\csname normal@char#2\endcsname}%
  \expandafter\edef\csname\user@group @sh@#2@\string\protect@\endcsname
    {\expandafter\noexpand\csname user@active#2\endcsname}%
%    \end{macrocode}
%
%    Finally, a couple of special cases are taken care of.  (1) If we
%    are making the right quote (|'|) active we need to change |\pr@m@s| as
%    well.  Also, make sure that a single |'| in math mode `does the
%    right thing'.  (2) If we are using the caret (|^|) as a shorthand
%    character special care should be taken to make sure math still
%    works. Therefore an extra level of expansion is introduced with a
%    check for math mode on the upper level.
%
%    \begin{macrocode}
  \if\string'#2%
    \let\prim@s\bbl@prim@s
    \let\active@math@prime#1%
  \fi
  \bbl@usehooks{initiateactive}{{#1}{#2}{#3}}}
%    \end{macrocode}
%
%    The following package options control the behavior of shorthands
%    in math mode.
%
%    \begin{macrocode}
%<<*More package options>>
\DeclareOption{math=active}{}
\DeclareOption{math=normal}{\def\bbl@mathnormal{\noexpand\textormath}}
%<</More package options>>
%    \end{macrocode}
%
%    Initiating a shorthand makes active the char. That is not
%    strictly necessary but it is still done for backward
%    compatibility. So we need to restore the original catcode at the
%    end of package \textit{and} and the end of the |ldf|.
%
%    \begin{macrocode}
\@ifpackagewith{babel}{KeepShorthandsActive}%
  {\let\bbl@restoreactive\@gobble}%
  {\def\bbl@restoreactive#1{%
     \bbl@exp{%
       \\\AfterBabelLanguage\\\CurrentOption
         {\catcode`#1=\the\catcode`#1\relax}%
       \\\AtEndOfPackage
         {\catcode`#1=\the\catcode`#1\relax}}}%
   \AtEndOfPackage{\let\bbl@restoreactive\@gobble}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@sh@select}
%    This command helps the shorthand supporting macros to select how
%    to proceed. Note that this macro needs to be expandable as do all
%    the shorthand macros in order for them to work in expansion-only
%    environments such as the argument of |\hyphenation|.
%
%    This macro expects the name of a group of shorthands in its first
%    argument and a shorthand character in its second argument. It
%    will expand to either |\bbl@firstcs| or |\bbl@scndcs|. Hence two
%    more arguments need to follow it.
%
%    \begin{macrocode}
\def\bbl@sh@select#1#2{%
  \expandafter\ifx\csname#1@sh@#2@sel\endcsname\relax
    \bbl@afterelse\bbl@scndcs
  \else
    \bbl@afterfi\csname#1@sh@#2@sel\endcsname
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\active@prefix}
%    The command |\active@prefix| which is used in the expansion of
%    active characters has a function similar to |\OT1-cmd| in that it
%    |\protect|s the active character whenever |\protect| is
%    \emph{not} |\@typeset@protect|. The |\@gobble| is needed to remove
%    a token such as |\activechar:| (when the double colon was the
%    active character to be dealt with). There are two definitions,
%    depending of |\ifincsname| is available. If there is, the
%    expansion will be more robust.
%
%    \begin{macrocode}
\begingroup
\bbl@ifunset{ifincsname}% TODO. Ugly. Correct?
  {\gdef\active@prefix#1{%
     \ifx\protect\@typeset@protect
     \else
       \ifx\protect\@unexpandable@protect
         \noexpand#1%
       \else
         \protect#1%
       \fi
       \expandafter\@gobble
     \fi}}
  {\gdef\active@prefix#1{%
     \ifincsname
       \string#1%
       \expandafter\@gobble
     \else
       \ifx\protect\@typeset@protect
       \else
         \ifx\protect\@unexpandable@protect
           \noexpand#1%
         \else
           \protect#1%
         \fi
         \expandafter\expandafter\expandafter\@gobble
       \fi
     \fi}}
\endgroup
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\if@safe@actives}
%    In some circumstances it is necessary to be able to change the
%    expansion of an active character on the fly. For this purpose the
%    switch |@safe@actives| is available. The setting of this switch
%    should be checked in the first level expansion of
%    |\active@char|\m{char}.
%
%    \begin{macrocode}
\newif\if@safe@actives
\@safe@activesfalse
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@restore@actives}
%    When the output routine kicks in while the
%    active characters were made ``safe'' this must be undone in
%    the headers to prevent unexpected typeset results. For this
%    situation we define a command to make them ``unsafe'' again.
%
%    \begin{macrocode}
\def\bbl@restore@actives{\if@safe@actives\@safe@activesfalse\fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@activate}
%  \begin{macro}{\bbl@deactivate}
%
%    Both macros take one argument, like |\initiate@active@char|. The
%    macro is used to change the definition of an active character to
%    expand to |\active@char|\m{char} in the case of |\bbl@activate|,
%    or |\normal@char|\m{char} in the case of |\bbl@deactivate|.
%
%    \begin{macrocode}
\chardef\bbl@activated\z@
\def\bbl@activate#1{%
  \chardef\bbl@activated\@ne
  \bbl@withactive{\expandafter\let\expandafter}#1%
    \csname bbl@active@\string#1\endcsname}
\def\bbl@deactivate#1{%
  \chardef\bbl@activated\tw@
  \bbl@withactive{\expandafter\let\expandafter}#1%
    \csname bbl@normal@\string#1\endcsname}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\bbl@firstcs}
%  \begin{macro}{\bbl@scndcs}
%
% These macros are used only as a trick when declaring shorthands.
%
%    \begin{macrocode}
\def\bbl@firstcs#1#2{\csname#1\endcsname}
\def\bbl@scndcs#1#2{\csname#2\endcsname}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\declare@shorthand}
%    The command |\declare@shorthand| is used to declare a shorthand
%    on a certain level. It takes three arguments:
%    \begin{enumerate}
%    \item a name for the collection of shorthands, i.e. `system', or
%      `dutch';
%    \item the character (sequence) that makes up the shorthand,
%      i.e. |~| or |"a|;
%    \item the code to be executed when the shorthand is encountered.
%    \end{enumerate}
%
% The auxiliary macro |\babel@texpdf| improves the interoperativity with
% \textsf{hyperref} and takes 4 arguments: (1) The \TeX{} code in text
% mode, (2) the string for \textsf{hyperref}, (3) the \TeX{} code in
% math mode, and (4), which is currently ignored, but it's meant for a
% string in math mode, like a minus sign instead of an hyphen
% (currently \textsf{hyperref} doesn't discriminate the mode). This
% macro may be used in |ldf| files.

%    \begin{macrocode}
\def\babel@texpdf#1#2#3#4{%
  \ifx\texorpdfstring\@undefined
    \textormath{#1}{#3}%
  \else
    \texorpdfstring{\textormath{#1}{#3}}{#2}%
    % \texorpdfstring{\textormath{#1}{#3}}{\textormath{#2}{#4}}%
  \fi}
%
\def\declare@shorthand#1#2{\@decl@short{#1}#2\@nil}
\def\@decl@short#1#2#3\@nil#4{%
  \def\bbl@tempa{#3}%
  \ifx\bbl@tempa\@empty
    \expandafter\let\csname #1@sh@\string#2@sel\endcsname\bbl@scndcs
    \bbl@ifunset{#1@sh@\string#2@}{}%
      {\def\bbl@tempa{#4}%
       \expandafter\ifx\csname#1@sh@\string#2@\endcsname\bbl@tempa
       \else
         \bbl@info
           {Redefining #1 shorthand \string#2\\%
            in language \CurrentOption}%
       \fi}%
    \@namedef{#1@sh@\string#2@}{#4}%
  \else
    \expandafter\let\csname #1@sh@\string#2@sel\endcsname\bbl@firstcs
    \bbl@ifunset{#1@sh@\string#2@\string#3@}{}%
      {\def\bbl@tempa{#4}%
       \expandafter\ifx\csname#1@sh@\string#2@\string#3@\endcsname\bbl@tempa
       \else
         \bbl@info
           {Redefining #1 shorthand \string#2\string#3\\%
            in language \CurrentOption}%
       \fi}%
    \@namedef{#1@sh@\string#2@\string#3@}{#4}%
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\textormath}
%    Some of the shorthands that will be declared by the language
%    definition files have to be usable in both text and mathmode. To
%    achieve this the helper macro |\textormath| is provided.
%
%    \begin{macrocode}
\def\textormath{%
  \ifmmode
    \expandafter\@secondoftwo
  \else
    \expandafter\@firstoftwo
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\user@group}
%  \begin{macro}{\language@group}
%  \begin{macro}{\system@group}
%    The current concept of `shorthands' supports three levels or
%    groups of shorthands. For each level the name of the level or
%    group is stored in a macro. The default is to have a user group;
%    use language group `english' and have a system group called
%    `system'.
%
%    \begin{macrocode}
\def\user@group{user}
\def\language@group{english} % TODO. I don't like defaults
\def\system@group{system}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\useshorthands}
%
%    This is the user level macro. It initializes and activates the
%    character for use as a shorthand character (ie, it's active in the
%    preamble). Languages can deactivate shorthands, so a starred
%    version is also provided which activates them always after the
%    language has been switched.
%
%    \begin{macrocode}
\def\useshorthands{%
  \@ifstar\bbl@usesh@s{\bbl@usesh@x{}}}
\def\bbl@usesh@s#1{%
  \bbl@usesh@x
    {\AddBabelHook{babel-sh-\string#1}{afterextras}{\bbl@activate{#1}}}%
    {#1}}
\def\bbl@usesh@x#1#2{%
  \bbl@ifshorthand{#2}%
    {\def\user@group{user}%
     \initiate@active@char{#2}%
     #1%
     \bbl@activate{#2}}%
    {\bbl@error
       {I can't declare a shorthand turned off (\string#2)}
       {Sorry, but you can't use shorthands which have been\\%
        turned off in the package options}}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\defineshorthand}
%
%    Currently we only support two groups of user level shorthands,
%    named internally |user| and |user@<lang>| (language-dependent
%    user shorthands). By default, only the first one is taken into
%    account, but if the former is also used (in the optional argument
%    of |\defineshorthand|) a new level is inserted for it
%    (|user@generic|, done by |\bbl@set@user@generic|); we make also
%    sure |{}| and |\protect| are taken into account in this new top
%    level.
%
%    \begin{macrocode}
\def\user@language@group{user@\language@group}
\def\bbl@set@user@generic#1#2{%
  \bbl@ifunset{user@generic@active#1}%
    {\bbl@active@def#1\user@language@group{user@active}{user@generic@active}%
     \bbl@active@def#1\user@group{user@generic@active}{language@active}%
     \expandafter\edef\csname#2@sh@#1@@\endcsname{%
       \expandafter\noexpand\csname normal@char#1\endcsname}%
     \expandafter\edef\csname#2@sh@#1@\string\protect@\endcsname{%
       \expandafter\noexpand\csname user@active#1\endcsname}}%
  \@empty}
\newcommand\defineshorthand[3][user]{%
  \edef\bbl@tempa{\zap@space#1 \@empty}%
  \bbl@for\bbl@tempb\bbl@tempa{%
    \if*\expandafter\@car\bbl@tempb\@nil
      \edef\bbl@tempb{user@\expandafter\@gobble\bbl@tempb}%
      \@expandtwoargs
        \bbl@set@user@generic{\expandafter\string\@car#2\@nil}\bbl@tempb
    \fi
    \declare@shorthand{\bbl@tempb}{#2}{#3}}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\languageshorthands}
%
%    A user level command to change the language from which shorthands
%    are used. Unfortunately, \babel{} currently does not keep track
%    of defined groups, and therefore there is no way to catch a
%    possible change in casing to fix it in the same way languages names
%    are fixed. [TODO].
%
%    \begin{macrocode}
\def\languageshorthands#1{\def\language@group{#1}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\aliasshorthand}
%    First the new shorthand needs to be initialized. Then, we define
%    the new shorthand in terms of the original one, but note with
%    |\aliasshorthands{"}{/}| is |\active@prefix /\active@char/|, so we
%    still need to let the lattest to |\active@char"|.
%
%
%    \begin{macrocode}
\def\aliasshorthand#1#2{%
  \bbl@ifshorthand{#2}%
    {\expandafter\ifx\csname active@char\string#2\endcsname\relax
       \ifx\document\@notprerr
         \@notshorthand{#2}%
       \else
         \initiate@active@char{#2}%
         \expandafter\let\csname active@char\string#2\expandafter\endcsname
           \csname active@char\string#1\endcsname
         \expandafter\let\csname normal@char\string#2\expandafter\endcsname
           \csname normal@char\string#1\endcsname
         \bbl@activate{#2}%
       \fi
     \fi}%
    {\bbl@error
       {Cannot declare a shorthand turned off (\string#2)}
       {Sorry, but you cannot use shorthands which have been\\%
        turned off in the package options}}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\@notshorthand}
%
%    \begin{macrocode}
\def\@notshorthand#1{%
  \bbl@error{%
    The character '\string #1' should be made a shorthand character;\\%
    add the command \string\useshorthands\string{#1\string} to
    the preamble.\\%
    I will ignore your instruction}%
   {You may proceed, but expect unexpected results}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\shorthandon}
%  \begin{macro}{\shorthandoff}
%    The first level definition of these macros just passes the
%    argument on to |\bbl@switch@sh|, adding |\@nil| at the end to
%    denote the end of the list of characters.
%
%    \begin{macrocode}
\newcommand*\shorthandon[1]{\bbl@switch@sh\@ne#1\@nnil}
\DeclareRobustCommand*\shorthandoff{%
  \@ifstar{\bbl@shorthandoff\tw@}{\bbl@shorthandoff\z@}}
\def\bbl@shorthandoff#1#2{\bbl@switch@sh#1#2\@nnil}
%    \end{macrocode}
%
%  \begin{macro}{\bbl@switch@sh}
%
%    The macro |\bbl@switch@sh| takes the list of characters apart one
%    by one and subsequently switches the category code of the
%    shorthand character according to the first argument of
%    |\bbl@switch@sh|.
%
%    But before any of this switching takes place we make sure that the
%    character we are dealing with is known as a shorthand character.
%    If it is, a macro such as |\active@char"| should exist.
%
%    Switching off and on is easy -- we just set the category code to
%    `other' (12) and |\active|. With the starred version, the original
%    catcode and the original definition, saved in
%    |@initiate@active@char|, are restored.
%
%    \begin{macrocode}
\def\bbl@switch@sh#1#2{%
  \ifx#2\@nnil\else
    \bbl@ifunset{bbl@active@\string#2}%
      {\bbl@error
         {I can't switch '\string#2' on or off--not a shorthand}%
         {This character is not a shorthand. Maybe you made\\%
          a typing mistake? I will ignore your instruction.}}%
      {\ifcase#1%   off, on, off*
         \catcode`#212\relax
       \or
         \catcode`#2\active
         \bbl@ifunset{bbl@shdef@\string#2}%
           {}%
           {\bbl@withactive{\expandafter\let\expandafter}#2%
              \csname bbl@shdef@\string#2\endcsname
            \bbl@csarg\let{shdef@\string#2}\relax}%
         \ifcase\bbl@activated\or
           \bbl@activate{#2}%
         \else
           \bbl@deactivate{#2}%
         \fi
       \or
         \bbl@ifunset{bbl@shdef@\string#2}%
           {\bbl@withactive{\bbl@csarg\let{shdef@\string#2}}#2}%
           {}%
         \csname bbl@oricat@\string#2\endcsname
         \csname bbl@oridef@\string#2\endcsname
       \fi}%
    \bbl@afterfi\bbl@switch@sh#1%
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% Note the value is that at the expansion time; eg, in the preample
% shorhands are usually deactivated.
%
%    \begin{macrocode}
\def\babelshorthand{\active@prefix\babelshorthand\bbl@putsh}
\def\bbl@putsh#1{%
  \bbl@ifunset{bbl@active@\string#1}%
     {\bbl@putsh@i#1\@empty\@nnil}%
     {\csname bbl@active@\string#1\endcsname}}
\def\bbl@putsh@i#1#2\@nnil{%
  \csname\language@group @sh@\string#1@%
    \ifx\@empty#2\else\string#2@\fi\endcsname}
\ifx\bbl@opt@shorthands\@nnil\else
  \let\bbl@s@initiate@active@char\initiate@active@char
  \def\initiate@active@char#1{%
    \bbl@ifshorthand{#1}{\bbl@s@initiate@active@char{#1}}{}}
  \let\bbl@s@switch@sh\bbl@switch@sh
  \def\bbl@switch@sh#1#2{%
    \ifx#2\@nnil\else
      \bbl@afterfi
      \bbl@ifshorthand{#2}{\bbl@s@switch@sh#1{#2}}{\bbl@switch@sh#1}%
    \fi}
  \let\bbl@s@activate\bbl@activate
  \def\bbl@activate#1{%
    \bbl@ifshorthand{#1}{\bbl@s@activate{#1}}{}}
  \let\bbl@s@deactivate\bbl@deactivate
  \def\bbl@deactivate#1{%
    \bbl@ifshorthand{#1}{\bbl@s@deactivate{#1}}{}}
\fi
%    \end{macrocode}
%
% You may want to test if a character is a shorthand. Note it does not
% test whether the shorthand is on or off.
%
%    \begin{macrocode}
\newcommand\ifbabelshorthand[3]{\bbl@ifunset{bbl@active@\string#1}{#3}{#2}}
%    \end{macrocode}
%
%  \begin{macro}{\bbl@prim@s}
%  \begin{macro}{\bbl@pr@m@s}
%
% One of the internal macros that are involved in substituting |\prime|
% for each right quote in mathmode is |\prim@s|. This checks if the
% next character is a right quote. When the right quote is active, the
% definition of this macro needs to be adapted to look also for an
% active right quote; the hat could be active, too.
%
%    \begin{macrocode}
\def\bbl@prim@s{%
  \prime\futurelet\@let@token\bbl@pr@m@s}
\def\bbl@if@primes#1#2{%
  \ifx#1\@let@token
    \expandafter\@firstoftwo
  \else\ifx#2\@let@token
    \bbl@afterelse\expandafter\@firstoftwo
  \else
    \bbl@afterfi\expandafter\@secondoftwo
  \fi\fi}
\begingroup
  \catcode`\^=7  \catcode`\*=\active  \lccode`\*=`\^
  \catcode`\'=12 \catcode`\"=\active  \lccode`\"=`\'
  \lowercase{%
    \gdef\bbl@pr@m@s{%
      \bbl@if@primes"'%
        \pr@@@s
        {\bbl@if@primes*^\pr@@@t\egroup}}}
\endgroup
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%    Usually the |~| is active and expands to \verb*=\penalty\@M\ =.
%    When it is written to the \file{.aux} file it is written
%    expanded. To prevent that and to be able to use the character |~|
%    as a start character for a shorthand, it is redefined here as a
%    one character shorthand on system level. The system declaration
%    is in most cases redundant (when |~| is still a non-break space),
%    and in some cases is inconvenient (if |~| has been redefined);
%    however, for backward compatibility it is maintained (some
%    existing documents may rely on the \babel{} value).
%
%    \begin{macrocode}
\initiate@active@char{~}
\declare@shorthand{system}{~}{\leavevmode\nobreak\ }
\bbl@activate{~}
%    \end{macrocode}
%
%  \begin{macro}{\OT1dqpos}
%  \begin{macro}{\T1dqpos}
%    The position of the double quote character is different for the
%    OT1 and T1 encodings. It will later be selected using the
%    |\f@encoding| macro. Therefore we define two macros here to store
%    the position of the character in these encodings.
%
%    \begin{macrocode}
\expandafter\def\csname OT1dqpos\endcsname{127}
\expandafter\def\csname T1dqpos\endcsname{4}
%    \end{macrocode}
%
%    When the macro |\f@encoding| is undefined (as it is in plain
%    \TeX) we define it here to expand to \texttt{OT1}
%
%    \begin{macrocode}
\ifx\f@encoding\@undefined
  \def\f@encoding{OT1}
\fi
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \subsection{Language attributes}
%
%    Language attributes provide a means to give the user control over
%    which features of the language definition files he wants to
%    enable.
%  \begin{macro}{\languageattribute}
%
%    The macro |\languageattribute| checks whether its arguments are
%    valid and then activates the selected language attribute.
%    First check whether the language is known, and then process each
%    attribute in the list.
%
%    \begin{macrocode}
\bbl@trace{Language attributes}
\newcommand\languageattribute[2]{%
  \def\bbl@tempc{#1}%
  \bbl@fixname\bbl@tempc
  \bbl@iflanguage\bbl@tempc{%
    \bbl@vforeach{#2}{%
%    \end{macrocode}
%
%    We want to make sure that each attribute is selected only once;
%    therefore we store the already selected attributes in
%    |\bbl@known@attribs|. When that control sequence is not yet
%    defined this attribute is certainly not selected before.
%
%    \begin{macrocode}
      \ifx\bbl@known@attribs\@undefined
        \in@false
      \else
        \bbl@xin@{,\bbl@tempc-##1,}{,\bbl@known@attribs,}%
      \fi
      \ifin@
        \bbl@warning{%
          You have more than once selected the attribute '##1'\\%
          for language #1. Reported}%
      \else
%    \end{macrocode}
%
%    When we end up here the attribute is not selected before. So, we
%    add it to the list of selected attributes and execute the
%    associated \TeX-code.
%
%    \begin{macrocode}
        \bbl@exp{%
          \\\bbl@add@list\\\bbl@known@attribs{\bbl@tempc-##1}}%
        \edef\bbl@tempa{\bbl@tempc-##1}%
        \expandafter\bbl@ifknown@ttrib\expandafter{\bbl@tempa}\bbl@attributes%
        {\csname\bbl@tempc @attr@##1\endcsname}%
        {\@attrerr{\bbl@tempc}{##1}}%
     \fi}}}
\@onlypreamble\languageattribute
%    \end{macrocode}
%
%    The error text to be issued when an unknown attribute is
%    selected.
%
%    \begin{macrocode}
\newcommand*{\@attrerr}[2]{%
  \bbl@error
    {The attribute #2 is unknown for language #1.}%
    {Your command will be ignored, type <return> to proceed}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@declare@ttribute}
%    This command adds the new language/attribute combination to the
%    list of known attributes.
%
%    Then it defines a control sequence to be executed when the
%    attribute is used in a document. The result of this should be
%    that the macro |\extras...| for the current language is extended,
%    otherwise the attribute will not work as its code is removed from
%    memory at |\begin{document}|.
%
%    \begin{macrocode}
\def\bbl@declare@ttribute#1#2#3{%
  \bbl@xin@{,#2,}{,\BabelModifiers,}%
  \ifin@
    \AfterBabelLanguage{#1}{\languageattribute{#1}{#2}}%
  \fi
  \bbl@add@list\bbl@attributes{#1-#2}%
  \expandafter\def\csname#1@attr@#2\endcsname{#3}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@ifattributeset}
%    This internal macro has 4 arguments. It can be used to interpret
%    \TeX\ code based on whether a certain attribute was set. This
%    command should appear inside the argument to |\AtBeginDocument|
%    because the attributes are set in the document preamble,
%    \emph{after} \babel\ is loaded.
%
%    The first argument is the language, the second argument the
%    attribute being checked, and the third and fourth arguments are
%    the true and false clauses.
%
%    \begin{macrocode}
\def\bbl@ifattributeset#1#2#3#4{%
  \ifx\bbl@known@attribs\@undefined
    \in@false
  \else
    \bbl@xin@{,#1-#2,}{,\bbl@known@attribs,}%
  \fi
  \ifin@
    \bbl@afterelse#3%
  \else
    \bbl@afterfi#4%
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@ifknown@ttrib}
%    An internal macro to check whether a given language/attribute is
%    known. The macro takes 4 arguments, the language/attribute, the
%    attribute list, the \TeX-code to be executed when the attribute
%    is known and the \TeX-code to be executed otherwise.
%
%    We first assume the attribute is unknown. Then we loop over the
%    list of known attributes, trying to find a match. 
%
%    \begin{macrocode}
\def\bbl@ifknown@ttrib#1#2{%
  \let\bbl@tempa\@secondoftwo
  \bbl@loopx\bbl@tempb{#2}{%
    \expandafter\in@\expandafter{\expandafter,\bbl@tempb,}{,#1,}%
    \ifin@
      \let\bbl@tempa\@firstoftwo
    \else
    \fi}%
  \bbl@tempa}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@clear@ttribs}
%    This macro removes all the attribute code from \LaTeX's memory at
%    |\begin{document}| time (if any is present).
%
%    \begin{macrocode}
\def\bbl@clear@ttribs{%
  \ifx\bbl@attributes\@undefined\else
    \bbl@loopx\bbl@tempa{\bbl@attributes}{%
      \expandafter\bbl@clear@ttrib\bbl@tempa.
      }%
    \let\bbl@attributes\@undefined
  \fi}
\def\bbl@clear@ttrib#1-#2.{%
  \expandafter\let\csname#1@attr@#2\endcsname\@undefined}
\AtBeginDocument{\bbl@clear@ttribs}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Support for saving macro definitions}
%
%  To save the meaning of control sequences using |\babel@save|, we
%  use temporary control sequences.  To save hash table entries for
%  these control sequences, we don't use the name of the control
%  sequence to be saved to construct the temporary name.  Instead we
%  simply use the value of a counter, which is reset to zero each time
%  we begin to save new values.  This works well because we release
%  the saved meanings before we begin to save a new set of control
%  sequence meanings (see |\selectlanguage| and |\originalTeX|). Note
%  undefined macros are not undefined any more when saved -- they are
%  |\relax|'ed.
%
%  \begin{macro}{\babel@savecnt}
%  \begin{macro}{\babel@beginsave}
%    The initialization of a new save cycle: reset the counter to
%    zero.
%
%    \begin{macrocode}
\bbl@trace{Macros for saving definitions}
\def\babel@beginsave{\babel@savecnt\z@}
%    \end{macrocode}
%
%    Before it's forgotten, allocate the counter and initialize all.
%
%    \begin{macrocode}
\newcount\babel@savecnt
\babel@beginsave
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\babel@save}
%  \begin{macro}{\babel@savevariable}
%
% The macro |\babel@save|\meta{csname} saves the current meaning of the
% control sequence \meta{csname} to
% |\originalTeX|\footnote{\cs{originalTeX} has to be expandable,
% i.\,e.\ you shouldn't let it to \cs{relax}.}. To do this, we let the
% current meaning to a temporary control sequence, the restore commands
% are appended to |\originalTeX| and the counter is incremented. The
% macro |\babel@savevariable|\meta{variable} saves the value of the
% variable. \meta{variable} can be anything allowed after the |\the|
% primitive.
%
%    \begin{macrocode}
\def\babel@save#1{%
  \expandafter\let\csname babel@\number\babel@savecnt\endcsname#1\relax
  \toks@\expandafter{\originalTeX\let#1=}%
  \bbl@exp{%
    \def\\\originalTeX{\the\toks@\<babel@\number\babel@savecnt>\relax}}%
  \advance\babel@savecnt\@ne}
\def\babel@savevariable#1{%
  \toks@\expandafter{\originalTeX #1=}%
  \bbl@exp{\def\\\originalTeX{\the\toks@\the#1\relax}}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\bbl@frenchspacing}
%  \begin{macro}{\bbl@nonfrenchspacing}
% Some languages need to have |\frenchspacing| in effect. Others
% don't want that. The command |\bbl@frenchspacing| switches it on
% when it isn't already in effect and |\bbl@nonfrenchspacing|
% switches it off if necessary. A more refined way to switch the
% catcodes is done with |ini| files. Here an auxiliary macro is
% defined, but the main part is in |\babelprovide|. This new method
% should be ideally the default one.
%
%    \begin{macrocode}
\def\bbl@frenchspacing{%
  \ifnum\the\sfcode`\.=\@m
    \let\bbl@nonfrenchspacing\relax
  \else
    \frenchspacing
    \let\bbl@nonfrenchspacing\nonfrenchspacing
  \fi}
\let\bbl@nonfrenchspacing\nonfrenchspacing
\let\bbl@elt\relax
\edef\bbl@fs@chars{%
  \bbl@elt{\string.}\@m{3000}\bbl@elt{\string?}\@m{3000}%
  \bbl@elt{\string!}\@m{3000}\bbl@elt{\string:}\@m{2000}%
  \bbl@elt{\string;}\@m{1500}\bbl@elt{\string,}\@m{1250}}
\def\bbl@pre@fs{%
  \def\bbl@elt##1##2##3{\sfcode`##1=\the\sfcode`##1\relax}%
  \edef\bbl@save@sfcodes{\bbl@fs@chars}}%
\def\bbl@post@fs{%
  \bbl@save@sfcodes
  \edef\bbl@tempa{\bbl@cl{frspc}}%
  \edef\bbl@tempa{\expandafter\@car\bbl@tempa\@nil}%
  \if u\bbl@tempa          % do nothing
  \else\if n\bbl@tempa     % non french
    \def\bbl@elt##1##2##3{%
      \ifnum\sfcode`##1=##2\relax
        \babel@savevariable{\sfcode`##1}%
        \sfcode`##1=##3\relax
      \fi}%
    \bbl@fs@chars
  \else\if y\bbl@tempa     % french
    \def\bbl@elt##1##2##3{%
      \ifnum\sfcode`##1=##3\relax
        \babel@savevariable{\sfcode`##1}%
        \sfcode`##1=##2\relax
      \fi}%
    \bbl@fs@chars
  \fi\fi\fi}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \subsection{Short tags}
%
% \begin{macro}{\babeltags}
% This macro is straightforward. After zapping spaces, we
% loop over the list and define the macros |\text|\m{tag} and
% |\|\m{tag}. Definitions are first expanded so that they don't
% contain |\csname| but the actual macro.
%
%   \begin{macrocode}
\bbl@trace{Short tags}
\def\babeltags#1{%
  \edef\bbl@tempa{\zap@space#1 \@empty}%
  \def\bbl@tempb##1=##2\@@{%
    \edef\bbl@tempc{%
      \noexpand\newcommand
      \expandafter\noexpand\csname ##1\endcsname{%
        \noexpand\protect
        \expandafter\noexpand\csname otherlanguage*\endcsname{##2}}
      \noexpand\newcommand
      \expandafter\noexpand\csname text##1\endcsname{%
        \noexpand\foreignlanguage{##2}}}
    \bbl@tempc}%
  \bbl@for\bbl@tempa\bbl@tempa{%
    \expandafter\bbl@tempb\bbl@tempa\@@}}
%    \end{macrocode}
%
% \end{macro}
%
% \subsection{Hyphens}
%
% \begin{macro}{\babelhyphenation}
%
% This macro saves hyphenation exceptions. Two macros are used to
% store them: |\bbl@hyphenation@| for the global ones and
% |\bbl@hyphenation<lang>| for language ones. See |\bbl@patterns|
% above for further details. We make sure there is a space between
% words when multiple commands are used.
%
%    \begin{macrocode}
\bbl@trace{Hyphens}
\@onlypreamble\babelhyphenation
\AtEndOfPackage{%
  \newcommand\babelhyphenation[2][\@empty]{%
    \ifx\bbl@hyphenation@\relax
      \let\bbl@hyphenation@\@empty
    \fi
    \ifx\bbl@hyphlist\@empty\else
      \bbl@warning{%
        You must not intermingle \string\selectlanguage\space and\\%
        \string\babelhyphenation\space or some exceptions will not\\%
        be taken into account. Reported}%
    \fi
    \ifx\@empty#1%
      \protected@edef\bbl@hyphenation@{\bbl@hyphenation@\space#2}%
    \else
      \bbl@vforeach{#1}{%
        \def\bbl@tempa{##1}%
        \bbl@fixname\bbl@tempa
        \bbl@iflanguage\bbl@tempa{%
          \bbl@csarg\protected@edef{hyphenation@\bbl@tempa}{%
            \bbl@ifunset{bbl@hyphenation@\bbl@tempa}%
              {}%
              {\csname bbl@hyphenation@\bbl@tempa\endcsname\space}%
            #2}}}%
    \fi}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@allowhyphens}
%
% This macro makes hyphenation possible. Basically its definition
% is nothing more than |\nobreak| |\hskip| \texttt{0pt plus
% 0pt}\footnote{\TeX\ begins and ends a word for hyphenation at a
% glue node. The penalty prevents a linebreak at this glue node.}.
%
%    \begin{macrocode}
\def\bbl@allowhyphens{\ifvmode\else\nobreak\hskip\z@skip\fi}
\def\bbl@t@one{T1}
\def\allowhyphens{\ifx\cf@encoding\bbl@t@one\else\bbl@allowhyphens\fi}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\babelhyphen}
%
% Macros to insert common hyphens. Note the space before |@| in
% |\babelhyphen|. Instead of protecting it with
% |\DeclareRobustCommand|, which could insert a |\relax|, we use
% the same procedure as shorthands, with |\active@prefix|.
%
%    \begin{macrocode}
\newcommand\babelnullhyphen{\char\hyphenchar\font}
\def\babelhyphen{\active@prefix\babelhyphen\bbl@hyphen}
\def\bbl@hyphen{%
  \@ifstar{\bbl@hyphen@i @}{\bbl@hyphen@i\@empty}}
\def\bbl@hyphen@i#1#2{%
  \bbl@ifunset{bbl@hy@#1#2\@empty}%
    {\csname bbl@#1usehyphen\endcsname{\discretionary{#2}{}{#2}}}%
    {\csname bbl@hy@#1#2\@empty\endcsname}}
%    \end{macrocode}
%
% The following two commands are used to wrap the ``hyphen'' and
% set the behavior of the rest of the word -- the version with a
% single |@| is used when further hyphenation is allowed, while
% that with |@@| if no more hyphens are allowed. In both cases, if
% the hyphen is preceded by a positive space, breaking after the
% hyphen is disallowed.
%
% There should not be a discretionary after a hyphen at the
% beginning of a word, so it is prevented if preceded by a
% skip. Unfortunately, this does handle cases like ``(-suffix)''.
% |\nobreak| is always preceded by |\leavevmode|, in case the
% shorthand starts a paragraph.
%
%    \begin{macrocode}
\def\bbl@usehyphen#1{%
  \leavevmode
  \ifdim\lastskip>\z@\mbox{#1}\else\nobreak#1\fi
  \nobreak\hskip\z@skip}
\def\bbl@@usehyphen#1{%
  \leavevmode\ifdim\lastskip>\z@\mbox{#1}\else#1\fi}
%    \end{macrocode}
%
%    The following macro inserts the hyphen char.
%
%    \begin{macrocode}
\def\bbl@hyphenchar{%
  \ifnum\hyphenchar\font=\m@ne
    \babelnullhyphen
  \else
    \char\hyphenchar\font
  \fi}
%    \end{macrocode}
%
%    Finally, we define the hyphen ``types''. Their names will not
%    change, so you may use them in |ldf|'s. After a space, the
%    |\mbox| in |\bbl@hy@nobreak| is redundant.
%
%    \begin{macrocode}
\def\bbl@hy@soft{\bbl@usehyphen{\discretionary{\bbl@hyphenchar}{}{}}}
\def\bbl@hy@@soft{\bbl@@usehyphen{\discretionary{\bbl@hyphenchar}{}{}}}
\def\bbl@hy@hard{\bbl@usehyphen\bbl@hyphenchar}
\def\bbl@hy@@hard{\bbl@@usehyphen\bbl@hyphenchar}
\def\bbl@hy@nobreak{\bbl@usehyphen{\mbox{\bbl@hyphenchar}}}
\def\bbl@hy@@nobreak{\mbox{\bbl@hyphenchar}}
\def\bbl@hy@repeat{%
  \bbl@usehyphen{%
    \discretionary{\bbl@hyphenchar}{\bbl@hyphenchar}{\bbl@hyphenchar}}}
\def\bbl@hy@@repeat{%
  \bbl@@usehyphen{%
    \discretionary{\bbl@hyphenchar}{\bbl@hyphenchar}{\bbl@hyphenchar}}}
\def\bbl@hy@empty{\hskip\z@skip}
\def\bbl@hy@@empty{\discretionary{}{}{}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\bbl@disc}
%    For some languages the macro |\bbl@disc| is used to ease the
%    insertion of discretionaries for letters that behave `abnormally'
%    at a breakpoint.
%
%    \begin{macrocode}
\def\bbl@disc#1#2{\nobreak\discretionary{#2-}{}{#1}\bbl@allowhyphens}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Multiencoding strings}
%
% The aim following commands is to provide a commom interface for
% strings in several encodings. They also contains several hooks which
% can be used by \luatex{} and \xetex. The code is organized here with
% pseudo-guards, so we start with the basic commands.
%
%  \paragraph{Tools}
%
% But first, a couple of tools. The first one makes global a local
% variable. This is not the best solution, but it works.
%
%    \begin{macrocode}
\bbl@trace{Multiencoding strings}
\def\bbl@toglobal#1{\global\let#1#1}
\def\bbl@recatcode#1{% TODO. Used only once?
  \@tempcnta="7F
  \def\bbl@tempa{%
    \ifnum\@tempcnta>"FF\else
      \catcode\@tempcnta=#1\relax
      \advance\@tempcnta\@ne
      \expandafter\bbl@tempa
    \fi}%
  \bbl@tempa}
%    \end{macrocode}
%
% The second one. We need to patch |\@uclclist|, but it is done once
% and only if |\SetCase| is used or if strings are encoded.  The code
% is far from satisfactory for several reasons, including the fact
% |\@uclclist| is not a list any more. Therefore a package option is
% added to ignore it. Instead of gobbling the macro
% getting the next two elements (usually |\reserved@a|), we pass it as
% argument to |\bbl@uclc|. The parser is restarted inside
% |\|\m{lang}|@bbl@uclc| because we do not know how many expansions
% are necessary (depends on whether strings are encoded). The last
% part is tricky -- when uppercasing, we have:
%\begin{verbatim}
% \let\bbl@tolower\@empty\bbl@toupper\@empty
%\end{verbatim}
% and starts over (and similarly when lowercasing).
%
%    \begin{macrocode}
\@ifpackagewith{babel}{nocase}%
  {\let\bbl@patchuclc\relax}%
  {\def\bbl@patchuclc{%
    \global\let\bbl@patchuclc\relax
    \g@addto@macro\@uclclist{\reserved@b{\reserved@b\bbl@uclc}}%
    \gdef\bbl@uclc##1{%
      \let\bbl@encoded\bbl@encoded@uclc
      \bbl@ifunset{\languagename @bbl@uclc}% and resumes it
        {##1}%
        {\let\bbl@tempa##1\relax % Used by LANG@bbl@uclc
         \csname\languagename @bbl@uclc\endcsname}%
      {\bbl@tolower\@empty}{\bbl@toupper\@empty}}%
    \gdef\bbl@tolower{\csname\languagename @bbl@lc\endcsname}%
    \gdef\bbl@toupper{\csname\languagename @bbl@uc\endcsname}}}
%    \end{macrocode}
%
%    \begin{macrocode}
%<<*More package options>>
\DeclareOption{nocase}{}
%<</More package options>>
%    \end{macrocode}
%
% The following package options control the behavior of |\SetString|.
%
%    \begin{macrocode}
%<<*More package options>>
\let\bbl@opt@strings\@nnil % accept strings=value
\DeclareOption{strings}{\def\bbl@opt@strings{\BabelStringsDefault}}
\DeclareOption{strings=encoded}{\let\bbl@opt@strings\relax}
\def\BabelStringsDefault{generic}
%<</More package options>>
%    \end{macrocode}
%
% \paragraph{Main command} This is the main command. With the first
% use it is redefined to omit the basic setup in subsequent blocks.
% We make sure strings contain actual letters in the range 128-255,
% not active characters.
%
%    \begin{macrocode}
\@onlypreamble\StartBabelCommands
\def\StartBabelCommands{%
  \begingroup
  \bbl@recatcode{11}%
  <@Macros local to BabelCommands@>
  \def\bbl@provstring##1##2{%
    \providecommand##1{##2}%
    \bbl@toglobal##1}%
  \global\let\bbl@scafter\@empty
  \let\StartBabelCommands\bbl@startcmds
  \ifx\BabelLanguages\relax
     \let\BabelLanguages\CurrentOption
  \fi
  \begingroup
  \let\bbl@screset\@nnil % local flag - disable 1st stopcommands
  \StartBabelCommands}
\def\bbl@startcmds{%
  \ifx\bbl@screset\@nnil\else
    \bbl@usehooks{stopcommands}{}%
  \fi
  \endgroup
  \begingroup
  \@ifstar
    {\ifx\bbl@opt@strings\@nnil
       \let\bbl@opt@strings\BabelStringsDefault
     \fi
     \bbl@startcmds@i}%
    \bbl@startcmds@i}
\def\bbl@startcmds@i#1#2{%
  \edef\bbl@L{\zap@space#1 \@empty}%
  \edef\bbl@G{\zap@space#2 \@empty}%
  \bbl@startcmds@ii}
\let\bbl@startcommands\StartBabelCommands
%    \end{macrocode}
%
% Parse the encoding info to get the label, input, and font parts.
%
% Select the behavior of |\SetString|. Thre are two main cases,
% depending of if there is an optional argument: without it and
% |strings=encoded|, strings are defined
% always; otherwise, they are set only if they are still undefined
% (ie, fallback values). With labelled blocks and
% |strings=encoded|, define the strings, but with another value,
% define strings only if the current label or font encoding is the
% value of |strings|; otherwise (ie, no |strings| or a block whose
% label is not in |strings=|) do nothing.
%
% We presume the current block is not loaded, and therefore set
% (above) a couple of default values to gobble the arguments. Then,
% these macros are redefined if necessary according to several
% parameters.
%
%    \begin{macrocode}
\newcommand\bbl@startcmds@ii[1][\@empty]{%
  \let\SetString\@gobbletwo
  \let\bbl@stringdef\@gobbletwo
  \let\AfterBabelCommands\@gobble
  \ifx\@empty#1%
    \def\bbl@sc@label{generic}%
    \def\bbl@encstring##1##2{%
      \ProvideTextCommandDefault##1{##2}%
      \bbl@toglobal##1%
      \expandafter\bbl@toglobal\csname\string?\string##1\endcsname}%
    \let\bbl@sctest\in@true
  \else
    \let\bbl@sc@charset\space % <- zapped below
    \let\bbl@sc@fontenc\space % <-   "      "
    \def\bbl@tempa##1=##2\@nil{%
      \bbl@csarg\edef{sc@\zap@space##1 \@empty}{##2 }}%
    \bbl@vforeach{label=#1}{\bbl@tempa##1\@nil}%
    \def\bbl@tempa##1 ##2{% space -> comma
      ##1%
      \ifx\@empty##2\else\ifx,##1,\else,\fi\bbl@afterfi\bbl@tempa##2\fi}%
    \edef\bbl@sc@fontenc{\expandafter\bbl@tempa\bbl@sc@fontenc\@empty}%
    \edef\bbl@sc@label{\expandafter\zap@space\bbl@sc@label\@empty}%
    \edef\bbl@sc@charset{\expandafter\zap@space\bbl@sc@charset\@empty}%
    \def\bbl@encstring##1##2{%
      \bbl@foreach\bbl@sc@fontenc{%
        \bbl@ifunset{T@####1}%
          {}%
          {\ProvideTextCommand##1{####1}{##2}%
           \bbl@toglobal##1%
           \expandafter
           \bbl@toglobal\csname####1\string##1\endcsname}}}%
    \def\bbl@sctest{%
      \bbl@xin@{,\bbl@opt@strings,}{,\bbl@sc@label,\bbl@sc@fontenc,}}%
  \fi
  \ifx\bbl@opt@strings\@nnil         % ie, no strings key -> defaults
  \else\ifx\bbl@opt@strings\relax    % ie, strings=encoded
    \let\AfterBabelCommands\bbl@aftercmds
    \let\SetString\bbl@setstring
    \let\bbl@stringdef\bbl@encstring
  \else       % ie, strings=value
  \bbl@sctest
  \ifin@
    \let\AfterBabelCommands\bbl@aftercmds
    \let\SetString\bbl@setstring
    \let\bbl@stringdef\bbl@provstring
  \fi\fi\fi
  \bbl@scswitch
  \ifx\bbl@G\@empty
    \def\SetString##1##2{%
      \bbl@error{Missing group for string \string##1}%
        {You must assign strings to some category, typically\\%
         captions or extras, but you set none}}%
  \fi
  \ifx\@empty#1%
    \bbl@usehooks{defaultcommands}{}%
  \else
    \@expandtwoargs
    \bbl@usehooks{encodedcommands}{{\bbl@sc@charset}{\bbl@sc@fontenc}}%
  \fi}
%    \end{macrocode}
%
% There are two versions of |\bbl@scswitch|. The first version is used
% when |ldf|s are read, and it makes sure |\|\m{group}\m{language} is
% reset, but only once (|\bbl@screset| is used to keep track of this).
% The second version is used in the preamble and packages loaded after
% \babel{} and does nothing.
%
% The macro |\bbl@forlang| loops |\bbl@L| but its body is executed only
% if the value is in |\BabelLanguages| (inside \babel) or
% |\date|\m{language} is defined (after \babel{} has been loaded).
% There are also two version of |\bbl@forlang|. The first one skips the
% current iteration if the language is not in |\BabelLanguages| (used
% in |ldf|s), and the second one skips undefined languages (after
% \babel{} has been loaded) .
%
%   \begin{macrocode}
\def\bbl@forlang#1#2{%
  \bbl@for#1\bbl@L{%
    \bbl@xin@{,#1,}{,\BabelLanguages,}%
    \ifin@#2\relax\fi}}
\def\bbl@scswitch{%
  \bbl@forlang\bbl@tempa{%
    \ifx\bbl@G\@empty\else
      \ifx\SetString\@gobbletwo\else
        \edef\bbl@GL{\bbl@G\bbl@tempa}%
        \bbl@xin@{,\bbl@GL,}{,\bbl@screset,}%
        \ifin@\else
          \global\expandafter\let\csname\bbl@GL\endcsname\@undefined
          \xdef\bbl@screset{\bbl@screset,\bbl@GL}%
        \fi
      \fi
    \fi}}
\AtEndOfPackage{%
  \def\bbl@forlang#1#2{\bbl@for#1\bbl@L{\bbl@ifunset{date#1}{}{#2}}}%
  \let\bbl@scswitch\relax}
\@onlypreamble\EndBabelCommands
\def\EndBabelCommands{%
  \bbl@usehooks{stopcommands}{}%
  \endgroup
  \endgroup
  \bbl@scafter}
\let\bbl@endcommands\EndBabelCommands
%    \end{macrocode}
%
% Now we define commands to be used inside |\StartBabelCommands|.
%
% \paragraph{Strings} The following macro is the actual definition
% of |\SetString| when it is ``active''
%
% First save the ``switcher''. Create it if undefined. Strings are
% defined only if undefined (ie, like |\providescommmand|). With
% the event |stringprocess| you can preprocess the string by
% manipulating the value of |\BabelString|. If there are several
% hooks assigned to this event, preprocessing is done in the same
% order as defined.  Finally, the string is set.
%
%    \begin{macrocode}
\def\bbl@setstring#1#2{% eg, \prefacename{<string>}
  \bbl@forlang\bbl@tempa{%
    \edef\bbl@LC{\bbl@tempa\bbl@stripslash#1}%
    \bbl@ifunset{\bbl@LC}% eg, \germanchaptername
      {\bbl@exp{%
         \global\\\bbl@add\<\bbl@G\bbl@tempa>{\\\bbl@scset\\#1\<\bbl@LC>}}}%
      {}%
    \def\BabelString{#2}%
    \bbl@usehooks{stringprocess}{}%
    \expandafter\bbl@stringdef
      \csname\bbl@LC\expandafter\endcsname\expandafter{\BabelString}}}
%    \end{macrocode}
%
%     Now, some addtional stuff to be used when encoded strings are
%     used. Captions then include |\bbl@encoded| for string to be
%     expanded in case transformations. It is |\relax| by default, but
%     in |\MakeUppercase| and |\MakeLowercase| its value is a modified
%     expandable |\@changed@cmd|.
%
%    \begin{macrocode}
\ifx\bbl@opt@strings\relax
  \def\bbl@scset#1#2{\def#1{\bbl@encoded#2}}
  \bbl@patchuclc
  \let\bbl@encoded\relax
  \def\bbl@encoded@uclc#1{%
    \@inmathwarn#1%
    \expandafter\ifx\csname\cf@encoding\string#1\endcsname\relax
      \expandafter\ifx\csname ?\string#1\endcsname\relax
        \TextSymbolUnavailable#1%
      \else
        \csname ?\string#1\endcsname
      \fi
    \else
      \csname\cf@encoding\string#1\endcsname
    \fi}
\else
  \def\bbl@scset#1#2{\def#1{#2}}
\fi
%    \end{macrocode}
%
% Define |\SetStringLoop|, which is actually set inside
% |\StartBabelCommands|. The current definition is somewhat complicated
% because we need a count, but |\count@| is not under our control
% (remember |\SetString| may call hooks). Instead of defining a
% dedicated count, we just ``pre-expand'' its value.
%
%    \begin{macrocode}
%<<*Macros local to BabelCommands>>
\def\SetStringLoop##1##2{%
    \def\bbl@templ####1{\expandafter\noexpand\csname##1\endcsname}%
    \count@\z@
    \bbl@loop\bbl@tempa{##2}{% empty items and spaces are ok
      \advance\count@\@ne
      \toks@\expandafter{\bbl@tempa}%
      \bbl@exp{%
        \\\SetString\bbl@templ{\romannumeral\count@}{\the\toks@}%
        \count@=\the\count@\relax}}}%
%<</Macros local to BabelCommands>>
%    \end{macrocode}
%
% \paragraph{Delaying code} Now the definition of |\AfterBabelCommands|
% when it is activated.
%
%    \begin{macrocode}
\def\bbl@aftercmds#1{%
  \toks@\expandafter{\bbl@scafter#1}%
  \xdef\bbl@scafter{\the\toks@}}
%    \end{macrocode}
%
% \paragraph{Case mapping}
%
% The command |\SetCase| provides a way to change the behavior of
% |\MakeUppercase| and |\MakeLowercase|. |\bbl@tempa| is set by the
% patched |\@uclclist| to the parsing command.
%
%    \begin{macrocode}
%<<*Macros local to BabelCommands>>
  \newcommand\SetCase[3][]{%
    \bbl@patchuclc
    \bbl@forlang\bbl@tempa{%
      \expandafter\bbl@encstring
        \csname\bbl@tempa @bbl@uclc\endcsname{\bbl@tempa##1}%
      \expandafter\bbl@encstring
        \csname\bbl@tempa @bbl@uc\endcsname{##2}%
      \expandafter\bbl@encstring
        \csname\bbl@tempa @bbl@lc\endcsname{##3}}}%
%<</Macros local to BabelCommands>>
%    \end{macrocode}
%
% Macros to deal with case mapping for hyphenation. To decide if the
% document is monolingual or multilingual, we make a rough guess --
% just see if there is a comma in the languages list, built in the
% first pass of the package options.
%
%    \begin{macrocode}
%<<*Macros local to BabelCommands>>
  \newcommand\SetHyphenMap[1]{%
    \bbl@forlang\bbl@tempa{%
      \expandafter\bbl@stringdef
        \csname\bbl@tempa @bbl@hyphenmap\endcsname{##1}}}%
%<</Macros local to BabelCommands>>
%    \end{macrocode}
%
%   There are 3 helper macros which do most of the work for you.
%
%   \begin{macrocode}
\newcommand\BabelLower[2]{% one to one.
  \ifnum\lccode#1=#2\else
    \babel@savevariable{\lccode#1}%
    \lccode#1=#2\relax
  \fi}
\newcommand\BabelLowerMM[4]{% many-to-many
  \@tempcnta=#1\relax
  \@tempcntb=#4\relax
  \def\bbl@tempa{%
    \ifnum\@tempcnta>#2\else
      \@expandtwoargs\BabelLower{\the\@tempcnta}{\the\@tempcntb}%
      \advance\@tempcnta#3\relax
      \advance\@tempcntb#3\relax
      \expandafter\bbl@tempa
    \fi}%
  \bbl@tempa}
\newcommand\BabelLowerMO[4]{% many-to-one
  \@tempcnta=#1\relax
  \def\bbl@tempa{%
    \ifnum\@tempcnta>#2\else
      \@expandtwoargs\BabelLower{\the\@tempcnta}{#4}%
      \advance\@tempcnta#3
      \expandafter\bbl@tempa
    \fi}%
  \bbl@tempa}
%    \end{macrocode}
%
% The following package options control the behavior of
% hyphenation mapping.
%
%    \begin{macrocode}
%<<*More package options>>
\DeclareOption{hyphenmap=off}{\chardef\bbl@opt@hyphenmap\z@}
\DeclareOption{hyphenmap=first}{\chardef\bbl@opt@hyphenmap\@ne}
\DeclareOption{hyphenmap=select}{\chardef\bbl@opt@hyphenmap\tw@}
\DeclareOption{hyphenmap=other}{\chardef\bbl@opt@hyphenmap\thr@@}
\DeclareOption{hyphenmap=other*}{\chardef\bbl@opt@hyphenmap4\relax}
%<</More package options>>
%    \end{macrocode}
%
%    Initial setup to provide a default behavior if |hypenmap|
%    is not set.
%
%    \begin{macrocode}
\AtEndOfPackage{%
  \ifx\bbl@opt@hyphenmap\@undefined
    \bbl@xin@{,}{\bbl@language@opts}%
    \chardef\bbl@opt@hyphenmap\ifin@4\else\@ne\fi
  \fi}
%    \end{macrocode}
%
% This sections ends with a general tool for resetting the caption
% names with a unique interface. With the old way, which mixes the
% switcher and the string, we convert it to the new one, which
% separates these two steps.
%
%    \begin{macrocode}
\newcommand\setlocalecaption{%  TODO. Catch typos. What about ensure?
  \@ifstar\bbl@setcaption@s\bbl@setcaption@x}
\def\bbl@setcaption@x#1#2#3{%  language caption-name string
  \bbl@trim@def\bbl@tempa{#2}%
  \bbl@xin@{.template}{\bbl@tempa}%
  \ifin@
    \bbl@ini@captions@template{#3}{#1}%
  \else
    \edef\bbl@tempd{%
      \expandafter\expandafter\expandafter
      \strip@prefix\expandafter\meaning\csname captions#1\endcsname}%
    \bbl@xin@
      {\expandafter\string\csname #2name\endcsname}%
      {\bbl@tempd}%
    \ifin@ % Renew caption
      \bbl@xin@{\string\bbl@scset}{\bbl@tempd}% 
      \ifin@
        \bbl@exp{%
          \\\bbl@ifsamestring{\bbl@tempa}{\languagename}%
            {\\\bbl@scset\<#2name>\<#1#2name>}%
            {}}%
      \else % Old way converts to new way
        \bbl@ifunset{#1#2name}%
          {\bbl@exp{%
            \\\bbl@add\<captions#1>{\def\<#2name>{\<#1#2name>}}%
            \\\bbl@ifsamestring{\bbl@tempa}{\languagename}%
              {\def\<#2name>{\<#1#2name>}}%
              {}}}%
          {}%
      \fi
    \else
      \bbl@xin@{\string\bbl@scset}{\bbl@tempd}% New
      \ifin@ % New way
        \bbl@exp{%
          \\\bbl@add\<captions#1>{\\\bbl@scset\<#2name>\<#1#2name>}%
          \\\bbl@ifsamestring{\bbl@tempa}{\languagename}%
            {\\\bbl@scset\<#2name>\<#1#2name>}%
            {}}%
      \else  % Old way, but defined in the new way
        \bbl@exp{%
          \\\bbl@add\<captions#1>{\def\<#2name>{\<#1#2name>}}%      
          \\\bbl@ifsamestring{\bbl@tempa}{\languagename}%
            {\def\<#2name>{\<#1#2name>}}%
            {}}%
      \fi%
    \fi
    \@namedef{#1#2name}{#3}%
    \toks@\expandafter{\bbl@captionslist}%
    \bbl@exp{\\\in@{\<#2name>}{\the\toks@}}%
    \ifin@\else
      \bbl@exp{\\\bbl@add\\\bbl@captionslist{\<#2name>}}%
      \bbl@toglobal\bbl@captionslist
    \fi
  \fi}
% \def\bbl@setcaption@s#1#2#3{}  % TODO. Not yet implemented
%    \end{macrocode}
%
% \subsection{Macros common to a number of languages}
%
%  \begin{macro}{\set@low@box}
%
% The following macro is used to lower quotes to the same level as
% the comma.  It prepares its argument in box register~0.
%
%    \begin{macrocode}
\bbl@trace{Macros related to glyphs}
\def\set@low@box#1{\setbox\tw@\hbox{,}\setbox\z@\hbox{#1}%
    \dimen\z@\ht\z@ \advance\dimen\z@ -\ht\tw@%
    \setbox\z@\hbox{\lower\dimen\z@ \box\z@}\ht\z@\ht\tw@ \dp\z@\dp\tw@}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\save@sf@q}
%    The macro |\save@sf@q| is used to save and reset the current
%    space factor.
%
%    \begin{macrocode}
\def\save@sf@q#1{\leavevmode
  \begingroup
    \edef\@SF{\spacefactor\the\spacefactor}#1\@SF
  \endgroup}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsection{Making glyphs available}
%
% This section makes a number of glyphs available that either do not
% exist in the \texttt{OT1} encoding and have to be `faked', or
% that are not accessible through \file{T1enc.def}.
%
% \subsubsection{Quotation marks}
%
%  \begin{macro}{\quotedblbase}
% In the \texttt{T1} encoding the opening double quote at the
% baseline is available as a separate character, accessible via
% |\quotedblbase|. In the \texttt{OT1} encoding it is not
% available, therefore we make it available by lowering the normal
% open quote character to the baseline.
%
%    \begin{macrocode}
\ProvideTextCommand{\quotedblbase}{OT1}{%
  \save@sf@q{\set@low@box{\textquotedblright\/}%
    \box\z@\kern-.04em\bbl@allowhyphens}}
%    \end{macrocode}
%
% Make sure that when an encoding other than \texttt{OT1} or
% \texttt{T1} is used this glyph can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\quotedblbase}{%
  \UseTextSymbol{OT1}{\quotedblbase}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\quotesinglbase}
%    We also need the single quote character at the baseline.
%
%    \begin{macrocode}
\ProvideTextCommand{\quotesinglbase}{OT1}{%
  \save@sf@q{\set@low@box{\textquoteright\/}%
    \box\z@\kern-.04em\bbl@allowhyphens}}
%    \end{macrocode}
%
%    Make sure that when an encoding other than \texttt{OT1} or
%    \texttt{T1} is used this glyph can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\quotesinglbase}{%
  \UseTextSymbol{OT1}{\quotesinglbase}}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\guillemetleft}
%  \begin{macro}{\guillemetright}
% The guillemet characters are not available in \texttt{OT1}
% encoding. They are faked. (Wrong names with o preserved for
% compatibility.)
%
%    \begin{macrocode}
\ProvideTextCommand{\guillemetleft}{OT1}{%
  \ifmmode
    \ll
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle\ll$}\bbl@allowhyphens}%
  \fi}
\ProvideTextCommand{\guillemetright}{OT1}{%
  \ifmmode
    \gg
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle\gg$}\bbl@allowhyphens}%
  \fi}
\ProvideTextCommand{\guillemotleft}{OT1}{%
  \ifmmode
    \ll
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle\ll$}\bbl@allowhyphens}%
  \fi}
\ProvideTextCommand{\guillemotright}{OT1}{%
  \ifmmode
    \gg
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle\gg$}\bbl@allowhyphens}%
  \fi}
%    \end{macrocode}
%
% Make sure that when an encoding other than \texttt{OT1} or
% \texttt{T1} is used these glyphs can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\guillemetleft}{%
  \UseTextSymbol{OT1}{\guillemetleft}}
\ProvideTextCommandDefault{\guillemetright}{%
  \UseTextSymbol{OT1}{\guillemetright}}
\ProvideTextCommandDefault{\guillemotleft}{%
  \UseTextSymbol{OT1}{\guillemotleft}}
\ProvideTextCommandDefault{\guillemotright}{%
  \UseTextSymbol{OT1}{\guillemotright}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\guilsinglleft}
%  \begin{macro}{\guilsinglright}
%    The single guillemets are not available in \texttt{OT1}
%    encoding. They are faked.
%
%    \begin{macrocode}
\ProvideTextCommand{\guilsinglleft}{OT1}{%
  \ifmmode
    <%
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle<$}\bbl@allowhyphens}%
  \fi}
\ProvideTextCommand{\guilsinglright}{OT1}{%
  \ifmmode
    >%
  \else
    \save@sf@q{\nobreak
      \raise.2ex\hbox{$\scriptscriptstyle>$}\bbl@allowhyphens}%
  \fi}
%    \end{macrocode}
%
% Make sure that when an encoding other than \texttt{OT1} or
% \texttt{T1} is used these glyphs can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\guilsinglleft}{%
  \UseTextSymbol{OT1}{\guilsinglleft}}
\ProvideTextCommandDefault{\guilsinglright}{%
  \UseTextSymbol{OT1}{\guilsinglright}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \subsubsection{Letters}
%
%  \begin{macro}{\ij}
%  \begin{macro}{\IJ}
% The dutch language uses the letter `ij'. It is available in
% \texttt{T1} encoded fonts, but not in the \texttt{OT1} encoded
% fonts. Therefore we fake it for the \texttt{OT1} encoding.
%
%    \begin{macrocode}
\DeclareTextCommand{\ij}{OT1}{%
  i\kern-0.02em\bbl@allowhyphens j}
\DeclareTextCommand{\IJ}{OT1}{%
  I\kern-0.02em\bbl@allowhyphens J}
\DeclareTextCommand{\ij}{T1}{\char188}
\DeclareTextCommand{\IJ}{T1}{\char156}
%    \end{macrocode}
%
%    Make sure that when an encoding other than \texttt{OT1} or
%    \texttt{T1} is used these glyphs can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\ij}{%
  \UseTextSymbol{OT1}{\ij}}
\ProvideTextCommandDefault{\IJ}{%
  \UseTextSymbol{OT1}{\IJ}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \begin{macro}{\dj}
% \begin{macro}{\DJ}
% The croatian language needs the letters |\dj| and |\DJ|; they are
% available in the \texttt{T1} encoding, but not in the
% \texttt{OT1} encoding by default.
%
% Some code to construct these glyphs for the \texttt{OT1} encoding
% was made available to me by Stipčević Mario,
% (\texttt{stipcevic@olimp.irb.hr}).
%
%    \begin{macrocode}
\def\crrtic@{\hrule height0.1ex width0.3em}
\def\crttic@{\hrule height0.1ex width0.33em}
\def\ddj@{%
  \setbox0\hbox{d}\dimen@=\ht0
  \advance\dimen@1ex
  \dimen@.45\dimen@
  \dimen@ii\expandafter\rem@pt\the\fontdimen\@ne\font\dimen@
  \advance\dimen@ii.5ex
  \leavevmode\rlap{\raise\dimen@\hbox{\kern\dimen@ii\vbox{\crrtic@}}}}
\def\DDJ@{%
  \setbox0\hbox{D}\dimen@=.55\ht0
  \dimen@ii\expandafter\rem@pt\the\fontdimen\@ne\font\dimen@
  \advance\dimen@ii.15ex %            correction for the dash position
  \advance\dimen@ii-.15\fontdimen7\font %     correction for cmtt font
  \dimen\thr@@\expandafter\rem@pt\the\fontdimen7\font\dimen@
  \leavevmode\rlap{\raise\dimen@\hbox{\kern\dimen@ii\vbox{\crttic@}}}}
%
\DeclareTextCommand{\dj}{OT1}{\ddj@ d}
\DeclareTextCommand{\DJ}{OT1}{\DDJ@ D}
%    \end{macrocode}
%
%    Make sure that when an encoding other than \texttt{OT1} or
%    \texttt{T1} is used these glyphs can still be typeset.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\dj}{%
  \UseTextSymbol{OT1}{\dj}}
\ProvideTextCommandDefault{\DJ}{%
  \UseTextSymbol{OT1}{\DJ}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\SS}
%    For the \texttt{T1} encoding |\SS| is defined and selects a
%    specific glyph from the font, but for other encodings it is not
%    available. Therefore we make it available here.
%
%    \begin{macrocode}
\DeclareTextCommand{\SS}{OT1}{SS}
\ProvideTextCommandDefault{\SS}{\UseTextSymbol{OT1}{\SS}}
%    \end{macrocode}
%
%  \end{macro}
%
% \subsubsection{Shorthands for quotation marks}
%
%    Shorthands are provided for a number of different quotation
%    marks, which make them usable both outside and inside mathmode.
%    They are defined with |\ProvideTextCommandDefault|, but this is
%    very likely not required because their definitions are based on
%    encoding-dependent macros.
%
%  \begin{macro}{\glq}
%  \begin{macro}{\grq}
%
%    The `german' single quotes.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\glq}{%
  \textormath{\quotesinglbase}{\mbox{\quotesinglbase}}}
%    \end{macrocode}
%
%    The definition of |\grq| depends on the fontencoding. With
%    \texttt{T1} encoding no extra kerning is needed.
%
%    \begin{macrocode}
\ProvideTextCommand{\grq}{T1}{%
  \textormath{\kern\z@\textquoteleft}{\mbox{\textquoteleft}}}
\ProvideTextCommand{\grq}{TU}{%
  \textormath{\textquoteleft}{\mbox{\textquoteleft}}}
\ProvideTextCommand{\grq}{OT1}{%
  \save@sf@q{\kern-.0125em
    \textormath{\textquoteleft}{\mbox{\textquoteleft}}%
    \kern.07em\relax}}
\ProvideTextCommandDefault{\grq}{\UseTextSymbol{OT1}\grq}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\glqq}
%  \begin{macro}{\grqq}
%
%    The `german' double quotes.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\glqq}{%
  \textormath{\quotedblbase}{\mbox{\quotedblbase}}}
%    \end{macrocode}
%
%    The definition of |\grqq| depends on the fontencoding. With
%    \texttt{T1} encoding no extra kerning is needed.
%
%    \begin{macrocode}
\ProvideTextCommand{\grqq}{T1}{%
  \textormath{\textquotedblleft}{\mbox{\textquotedblleft}}}
\ProvideTextCommand{\grqq}{TU}{%
  \textormath{\textquotedblleft}{\mbox{\textquotedblleft}}}
\ProvideTextCommand{\grqq}{OT1}{%
  \save@sf@q{\kern-.07em
    \textormath{\textquotedblleft}{\mbox{\textquotedblleft}}%
    \kern.07em\relax}}
\ProvideTextCommandDefault{\grqq}{\UseTextSymbol{OT1}\grqq}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\flq}
%  \begin{macro}{\frq}
%
%    The `french' single guillemets.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\flq}{%
  \textormath{\guilsinglleft}{\mbox{\guilsinglleft}}}
\ProvideTextCommandDefault{\frq}{%
  \textormath{\guilsinglright}{\mbox{\guilsinglright}}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\flqq}
%  \begin{macro}{\frqq}
%
%    The `french' double guillemets.
%
%    \begin{macrocode}
\ProvideTextCommandDefault{\flqq}{%
  \textormath{\guillemetleft}{\mbox{\guillemetleft}}}
\ProvideTextCommandDefault{\frqq}{%
  \textormath{\guillemetright}{\mbox{\guillemetright}}}
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
% \subsubsection{Umlauts and tremas}
%
%    The command |\"| needs to have a different effect for different
%    languages. For German for instance, the `umlaut' should be
%    positioned lower than the default position for placing it over
%    the letters a, o, u, A, O and U. When placed over an e, i, E or I
%    it can retain its normal position. For Dutch the same glyph is
%    always placed in the lower position.
%
%  \begin{macro}{\umlauthigh}
%
%  \begin{macro}{\umlautlow}
%    To be able to provide both positions of |\"| we provide two
%    commands to switch the positioning, the default will be
%    |\umlauthigh| (the normal positioning).
%
%    \begin{macrocode}
\def\umlauthigh{%
  \def\bbl@umlauta##1{\leavevmode\bgroup%
      \expandafter\accent\csname\f@encoding dqpos\endcsname
      ##1\bbl@allowhyphens\egroup}%
  \let\bbl@umlaute\bbl@umlauta}
\def\umlautlow{%
  \def\bbl@umlauta{\protect\lower@umlaut}}
\def\umlautelow{%
  \def\bbl@umlaute{\protect\lower@umlaut}}
\umlauthigh
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\lower@umlaut}
%    The command |\lower@umlaut| is used to position the |\"| closer
%    to the letter.
%
%    We want the umlaut character lowered, nearer to the letter. To do
%    this we need an extra \meta{dimen} register.
%
%    \begin{macrocode}
\expandafter\ifx\csname U@D\endcsname\relax
  \csname newdimen\endcsname\U@D
\fi
%    \end{macrocode}
%
%    The following code fools \TeX's \texttt{make\_accent} procedure
%    about the current x-height of the font to force another placement
%    of the umlaut character.
%    First we have to save the current x-height of the font, because
%    we'll change this font dimension and this is always done
%    globally.
%
%    Then we compute the new x-height in such a way that the umlaut
%    character is lowered to the base character.  The value of
%    \texttt{.45ex} depends on the \MF\ parameters with which the
%    fonts were built.  (Just try out, which value will look best.)
%    If the new x-height is too low, it is not changed.
%    Finally we call the |\accent| primitive, reset the old x-height
%    and insert the base character in the argument.
%
%    \begin{macrocode}
\def\lower@umlaut#1{%
  \leavevmode\bgroup
    \U@D 1ex%
    {\setbox\z@\hbox{%
      \expandafter\char\csname\f@encoding dqpos\endcsname}%
      \dimen@ -.45ex\advance\dimen@\ht\z@
      \ifdim 1ex<\dimen@ \fontdimen5\font\dimen@ \fi}%
    \expandafter\accent\csname\f@encoding dqpos\endcsname
    \fontdimen5\font\U@D #1%
  \egroup}
%    \end{macrocode}
%
%  \end{macro}
%
% For all vowels we declare |\"| to be a composite command which
% uses |\bbl@umlauta| or |\bbl@umlaute| to position the umlaut
% character. We need to be sure that these definitions override the
% ones that are provided when the package \pkg{fontenc} with
% option \Lopt{OT1} is used. Therefore these declarations are
% postponed until the beginning of the document. Note these
% definitions only apply to some languages, but
% babel sets them for \textit{all} languages -- you may want to
% redefine |\bbl@umlauta| and/or |\bbl@umlaute| for a language
% in the corresponding |ldf| (using the babel switching mechanism,
% of course).
%
%    \begin{macrocode}
\AtBeginDocument{%
  \DeclareTextCompositeCommand{\"}{OT1}{a}{\bbl@umlauta{a}}%
  \DeclareTextCompositeCommand{\"}{OT1}{e}{\bbl@umlaute{e}}%
  \DeclareTextCompositeCommand{\"}{OT1}{i}{\bbl@umlaute{\i}}%
  \DeclareTextCompositeCommand{\"}{OT1}{\i}{\bbl@umlaute{\i}}%
  \DeclareTextCompositeCommand{\"}{OT1}{o}{\bbl@umlauta{o}}%
  \DeclareTextCompositeCommand{\"}{OT1}{u}{\bbl@umlauta{u}}%
  \DeclareTextCompositeCommand{\"}{OT1}{A}{\bbl@umlauta{A}}%
  \DeclareTextCompositeCommand{\"}{OT1}{E}{\bbl@umlaute{E}}%
  \DeclareTextCompositeCommand{\"}{OT1}{I}{\bbl@umlaute{I}}%
  \DeclareTextCompositeCommand{\"}{OT1}{O}{\bbl@umlauta{O}}%
  \DeclareTextCompositeCommand{\"}{OT1}{U}{\bbl@umlauta{U}}}
%    \end{macrocode}
%
% Finally, make sure the default hyphenrules are defined (even if
% empty). For internal use, another empty |\language| is defined.
% Currently used in Amharic.
%
%    \begin{macrocode}
\ifx\l@english\@undefined
  \chardef\l@english\z@
\fi
% The following is used to cancel rules in ini files (see Amharic).
\ifx\l@unhyphenated\@undefined
  \newlanguage\l@unhyphenated
\fi
%    \end{macrocode}
%
% \subsection{Layout}
%
% Layout is mainly intended to set bidi documents, but there is at
% least a tool useful in general.
%
%    \begin{macrocode}
\bbl@trace{Bidi layout}
\providecommand\IfBabelLayout[3]{#3}%
\newcommand\BabelPatchSection[1]{%
  \@ifundefined{#1}{}{%
    \bbl@exp{\let\<bbl@ss@#1>\<#1>}%
    \@namedef{#1}{%
      \@ifstar{\bbl@presec@s{#1}}%
              {\@dblarg{\bbl@presec@x{#1}}}}}}
\def\bbl@presec@x#1[#2]#3{%
  \bbl@exp{%
    \\\select@language@x{\bbl@main@language}%
    \\\bbl@cs{sspre@#1}%
    \\\bbl@cs{ss@#1}%
      [\\\foreignlanguage{\languagename}{\unexpanded{#2}}]%
      {\\\foreignlanguage{\languagename}{\unexpanded{#3}}}%
    \\\select@language@x{\languagename}}}
\def\bbl@presec@s#1#2{%
  \bbl@exp{%
    \\\select@language@x{\bbl@main@language}%
    \\\bbl@cs{sspre@#1}%
    \\\bbl@cs{ss@#1}*%
      {\\\foreignlanguage{\languagename}{\unexpanded{#2}}}%
    \\\select@language@x{\languagename}}}
\IfBabelLayout{sectioning}%
  {\BabelPatchSection{part}%
   \BabelPatchSection{chapter}%
   \BabelPatchSection{section}%
   \BabelPatchSection{subsection}%
   \BabelPatchSection{subsubsection}%
   \BabelPatchSection{paragraph}%
   \BabelPatchSection{subparagraph}%
   \def\babel@toc#1{%
     \select@language@x{\bbl@main@language}}}{}
\IfBabelLayout{captions}%
  {\BabelPatchSection{caption}}{}
%    \end{macrocode}
%
% \subsection{Load engine specific macros}
%
%    \begin{macrocode}
\bbl@trace{Input engine specific macros}
\ifcase\bbl@engine
  \input txtbabel.def
\or
  \input luababel.def
\or
  \input xebabel.def
\fi
%    \end{macrocode}
%
% \subsection{Creating and modifying languages}
%
% |\babelprovide| is a general purpose tool for creating and modifying
% languages. It creates the language infrastructure, and loads, if
% requested, an |ini| file. It may be used in conjunction to previouly
% loaded |ldf| files.
%
%    \begin{macrocode}
\bbl@trace{Creating languages and reading ini files}
\let\bbl@extend@ini\@gobble
\newcommand\babelprovide[2][]{%
  \let\bbl@savelangname\languagename
  \edef\bbl@savelocaleid{\the\localeid}%
  % Set name and locale id
  \edef\languagename{#2}%
  \bbl@id@assign
  % Initialize keys
  \let\bbl@KVP@captions\@nil
  \let\bbl@KVP@date\@nil
  \let\bbl@KVP@import\@nil
  \let\bbl@KVP@main\@nil
  \let\bbl@KVP@script\@nil
  \let\bbl@KVP@language\@nil
  \let\bbl@KVP@hyphenrules\@nil
  \let\bbl@KVP@linebreaking\@nil
  \let\bbl@KVP@justification\@nil
  \let\bbl@KVP@mapfont\@nil
  \let\bbl@KVP@maparabic\@nil
  \let\bbl@KVP@mapdigits\@nil
  \let\bbl@KVP@intraspace\@nil
  \let\bbl@KVP@intrapenalty\@nil
  \let\bbl@KVP@onchar\@nil
  \let\bbl@KVP@transforms\@nil
  \global\let\bbl@release@transforms\@empty
  \let\bbl@KVP@alph\@nil
  \let\bbl@KVP@Alph\@nil
  \let\bbl@KVP@labels\@nil
  \bbl@csarg\let{KVP@labels*}\@nil
  \global\let\bbl@inidata\@empty
  \global\let\bbl@extend@ini\@gobble
  \gdef\bbl@key@list{;}% 
  \bbl@forkv{#1}{%  TODO - error handling
    \in@{/}{##1}%
    \ifin@
      \global\let\bbl@extend@ini\bbl@extend@ini@aux
      \bbl@renewinikey##1\@@{##2}%
    \else
      \bbl@csarg\def{KVP@##1}{##2}%
    \fi}%
  \chardef\bbl@howloaded=% 0:none; 1:ldf without ini; 2:ini
    \bbl@ifunset{date#2}\z@{\bbl@ifunset{bbl@llevel@#2}\@ne\tw@}%
  % == init ==
  \ifx\bbl@screset\@undefined
    \bbl@ldfinit
  \fi
  % ==
  \let\bbl@lbkflag\relax % \@empty = do setup linebreak
  \ifcase\bbl@howloaded
    \let\bbl@lbkflag\@empty % new
  \else
    \ifx\bbl@KVP@hyphenrules\@nil\else
       \let\bbl@lbkflag\@empty
    \fi
    \ifx\bbl@KVP@import\@nil\else
      \let\bbl@lbkflag\@empty
    \fi
  \fi
  % == import, captions ==
  \ifx\bbl@KVP@import\@nil\else
    \bbl@exp{\\\bbl@ifblank{\bbl@KVP@import}}%
      {\ifx\bbl@initoload\relax
         \begingroup
           \def\BabelBeforeIni##1##2{\gdef\bbl@KVP@import{##1}\endinput}%
           \bbl@input@texini{#2}%
         \endgroup
       \else
         \xdef\bbl@KVP@import{\bbl@initoload}%
       \fi}%
      {}%
  \fi
  \ifx\bbl@KVP@captions\@nil
    \let\bbl@KVP@captions\bbl@KVP@import
  \fi
  % ==
  \ifx\bbl@KVP@transforms\@nil\else
    \bbl@replace\bbl@KVP@transforms{ }{,}%
  \fi
  % Load ini
  \ifcase\bbl@howloaded
    \bbl@provide@new{#2}%
  \else
    \bbl@ifblank{#1}%
      {}%  With \bbl@load@basic below
      {\bbl@provide@renew{#2}}%
  \fi
  % Post tasks
  % ----------
  % == subsequent calls after the first provide for a locale ==
  \ifx\bbl@inidata\@empty\else
    \bbl@extend@ini{#2}%
  \fi
  % == ensure captions ==
  \ifx\bbl@KVP@captions\@nil\else
    \bbl@ifunset{bbl@extracaps@#2}%
      {\bbl@exp{\\\babelensure[exclude=\\\today]{#2}}}%
      {\toks@\expandafter\expandafter\expandafter
        {\csname bbl@extracaps@#2\endcsname}%
       \bbl@exp{\\\babelensure[exclude=\\\today,include=\the\toks@}]{#2}}%
    \bbl@ifunset{bbl@ensure@\languagename}%
      {\bbl@exp{%
        \\\DeclareRobustCommand\<bbl@ensure@\languagename>[1]{%
          \\\foreignlanguage{\languagename}%
          {####1}}}}%
      {}%
    \bbl@exp{%
       \\\bbl@toglobal\<bbl@ensure@\languagename>%
       \\\bbl@toglobal\<bbl@ensure@\languagename\space>}%
  \fi
  % ==
  % At this point all parameters are defined if 'import'. Now we
  % execute some code depending on them. But what about if nothing was
  % imported? We just set the basic parameters, but still loading the
  % whole ini file.
  \bbl@load@basic{#2}%
  % == script, language ==
  % Override the values from ini or defines them
  \ifx\bbl@KVP@script\@nil\else
    \bbl@csarg\edef{sname@#2}{\bbl@KVP@script}%
  \fi
  \ifx\bbl@KVP@language\@nil\else
    \bbl@csarg\edef{lname@#2}{\bbl@KVP@language}%
  \fi
   % == onchar ==
  \ifx\bbl@KVP@onchar\@nil\else
    \bbl@luahyphenate
    \directlua{
      if Babel.locale_mapped == nil then
        Babel.locale_mapped = true
        Babel.linebreaking.add_before(Babel.locale_map)
        Babel.loc_to_scr = {}
        Babel.chr_to_loc = Babel.chr_to_loc or {}
      end}%
    \bbl@xin@{ ids }{ \bbl@KVP@onchar\space}%
    \ifin@
      \ifx\bbl@starthyphens\@undefined % Needed if no explicit selection
        \AddBabelHook{babel-onchar}{beforestart}{{\bbl@starthyphens}}%
      \fi
      \bbl@exp{\\\bbl@add\\\bbl@starthyphens
        {\\\bbl@patterns@lua{\languagename}}}%
      % TODO - error/warning if no script
      \directlua{
        if Babel.script_blocks['\bbl@cl{sbcp}'] then
          Babel.loc_to_scr[\the\localeid] =
            Babel.script_blocks['\bbl@cl{sbcp}']
          Babel.locale_props[\the\localeid].lc = \the\localeid\space
          Babel.locale_props[\the\localeid].lg = \the\@nameuse{l@\languagename}\space
        end
      }%
    \fi
    \bbl@xin@{ fonts }{ \bbl@KVP@onchar\space}%
    \ifin@
      \bbl@ifunset{bbl@lsys@\languagename}{\bbl@provide@lsys{\languagename}}{}%
      \bbl@ifunset{bbl@wdir@\languagename}{\bbl@provide@dirs{\languagename}}{}%
      \directlua{
        if Babel.script_blocks['\bbl@cl{sbcp}'] then
          Babel.loc_to_scr[\the\localeid] =
            Babel.script_blocks['\bbl@cl{sbcp}']
        end}%
      \ifx\bbl@mapselect\@undefined  % TODO. almost the same as mapfont
        \AtBeginDocument{%
          \expandafter\bbl@add\csname selectfont \endcsname{{\bbl@mapselect}}%
          {\selectfont}}%
        \def\bbl@mapselect{%
          \let\bbl@mapselect\relax
          \edef\bbl@prefontid{\fontid\font}}%
        \def\bbl@mapdir##1{%
          {\def\languagename{##1}%
           \let\bbl@ifrestoring\@firstoftwo % To avoid font warning
           \bbl@switchfont
           \directlua{
             Babel.locale_props[\the\csname bbl@id@@##1\endcsname]%
                     ['/\bbl@prefontid'] = \fontid\font\space}}}%
      \fi
      \bbl@exp{\\\bbl@add\\\bbl@mapselect{\\\bbl@mapdir{\languagename}}}%
    \fi
    % TODO - catch non-valid values
  \fi
  % == mapfont ==
  % For bidi texts, to switch the font based on direction
  \ifx\bbl@KVP@mapfont\@nil\else
    \bbl@ifsamestring{\bbl@KVP@mapfont}{direction}{}%
      {\bbl@error{Option '\bbl@KVP@mapfont' unknown for\\%
                  mapfont. Use 'direction'.%
                 {See the manual for details.}}}%
    \bbl@ifunset{bbl@lsys@\languagename}{\bbl@provide@lsys{\languagename}}{}%
    \bbl@ifunset{bbl@wdir@\languagename}{\bbl@provide@dirs{\languagename}}{}%
    \ifx\bbl@mapselect\@undefined % TODO. See onchar
      \AtBeginDocument{%
        \expandafter\bbl@add\csname selectfont \endcsname{{\bbl@mapselect}}%
        {\selectfont}}%
      \def\bbl@mapselect{%
        \let\bbl@mapselect\relax
        \edef\bbl@prefontid{\fontid\font}}%
      \def\bbl@mapdir##1{%
        {\def\languagename{##1}%
         \let\bbl@ifrestoring\@firstoftwo % avoid font warning
         \bbl@switchfont
         \directlua{Babel.fontmap
           [\the\csname bbl@wdir@##1\endcsname]%
           [\bbl@prefontid]=\fontid\font}}}%
    \fi
    \bbl@exp{\\\bbl@add\\\bbl@mapselect{\\\bbl@mapdir{\languagename}}}%
  \fi
  % == Line breaking: intraspace, intrapenalty ==
  % For CJK, East Asian, Southeast Asian, if interspace in ini
  \ifx\bbl@KVP@intraspace\@nil\else % We can override the ini or set
    \bbl@csarg\edef{intsp@#2}{\bbl@KVP@intraspace}%
  \fi
  \bbl@provide@intraspace
  % == Line breaking: justification ==
  \ifx\bbl@KVP@justification\@nil\else
     \let\bbl@KVP@linebreaking\bbl@KVP@justification
  \fi
  \ifx\bbl@KVP@linebreaking\@nil\else
    \bbl@xin@{,\bbl@KVP@linebreaking,}{,elongated,kashida,cjk,unhyphenated,}%
    \ifin@
      \bbl@csarg\xdef
        {lnbrk@\languagename}{\expandafter\@car\bbl@KVP@linebreaking\@nil}%
    \fi
  \fi
  \bbl@xin@{/e}{/\bbl@cl{lnbrk}}%
  \ifin@\else\bbl@xin@{/k}{/\bbl@cl{lnbrk}}\fi
  \ifin@\bbl@arabicjust\fi
  % == Line breaking: hyphenate.other.(locale|script) ==
  \ifx\bbl@lbkflag\@empty
    \bbl@ifunset{bbl@hyotl@\languagename}{}%
      {\bbl@csarg\bbl@replace{hyotl@\languagename}{ }{,}%
       \bbl@startcommands*{\languagename}{}%
         \bbl@csarg\bbl@foreach{hyotl@\languagename}{%
           \ifcase\bbl@engine
             \ifnum##1<257
               \SetHyphenMap{\BabelLower{##1}{##1}}%
             \fi
           \else
             \SetHyphenMap{\BabelLower{##1}{##1}}%
           \fi}%
       \bbl@endcommands}%
    \bbl@ifunset{bbl@hyots@\languagename}{}%
      {\bbl@csarg\bbl@replace{hyots@\languagename}{ }{,}%
       \bbl@csarg\bbl@foreach{hyots@\languagename}{%
         \ifcase\bbl@engine
           \ifnum##1<257
             \global\lccode##1=##1\relax
           \fi
         \else
           \global\lccode##1=##1\relax
         \fi}}%
  \fi
  % == Counters: maparabic ==
  % Native digits, if provided in ini (TeX level, xe and lua)
  \ifcase\bbl@engine\else
    \bbl@ifunset{bbl@dgnat@\languagename}{}%
      {\expandafter\ifx\csname bbl@dgnat@\languagename\endcsname\@empty\else
        \expandafter\expandafter\expandafter
        \bbl@setdigits\csname bbl@dgnat@\languagename\endcsname
        \ifx\bbl@KVP@maparabic\@nil\else
          \ifx\bbl@latinarabic\@undefined
            \expandafter\let\expandafter\@arabic
              \csname bbl@counter@\languagename\endcsname
          \else    % ie, if layout=counters, which redefines \@arabic
            \expandafter\let\expandafter\bbl@latinarabic
              \csname bbl@counter@\languagename\endcsname
          \fi
        \fi
      \fi}%
  \fi
  % == Counters: mapdigits ==
  % Native digits (lua level).
  \ifodd\bbl@engine
    \ifx\bbl@KVP@mapdigits\@nil\else
      \bbl@ifunset{bbl@dgnat@\languagename}{}%
        {\RequirePackage{luatexbase}%
         \bbl@activate@preotf
         \directlua{
           Babel = Babel or {}  %%% -> presets in luababel
           Babel.digits_mapped = true
           Babel.digits = Babel.digits or {}
           Babel.digits[\the\localeid] =
             table.pack(string.utfvalue('\bbl@cl{dgnat}'))
           if not Babel.numbers then
             function Babel.numbers(head)
               local LOCALE = luatexbase.registernumber'bbl@attr@locale'
               local GLYPH = node.id'glyph'
               local inmath = false
               for item in node.traverse(head) do
                 if not inmath and item.id == GLYPH then
                   local temp = node.get_attribute(item, LOCALE)
                   if Babel.digits[temp] then
                     local chr = item.char
                     if chr > 47 and chr < 58 then
                       item.char = Babel.digits[temp][chr-47]
                     end
                   end
                 elseif item.id == node.id'math' then
                   inmath = (item.subtype == 0)
                 end
               end
               return head
             end
           end
        }}%
    \fi
  \fi
  % == Counters: alph, Alph ==
  % What if extras<lang> contains a \babel@save\@alph? It won't be
  % restored correctly when exiting the language, so we ignore 
  % this change with the \bbl@alph@saved trick.
  \ifx\bbl@KVP@alph\@nil\else
    \bbl@extras@wrap{\\\bbl@alph@saved}%
      {\let\bbl@alph@saved\@alph}%
      {\let\@alph\bbl@alph@saved
       \babel@save\@alph}%
    \bbl@exp{%
      \\\bbl@add\<extras\languagename>{%
        \let\\\@alph\<bbl@cntr@\bbl@KVP@alph @\languagename>}}%
  \fi
  \ifx\bbl@KVP@Alph\@nil\else
    \bbl@extras@wrap{\\\bbl@Alph@saved}%
      {\let\bbl@Alph@saved\@Alph}%
      {\let\@Alph\bbl@Alph@saved
       \babel@save\@Alph}%
    \bbl@exp{%
      \\\bbl@add\<extras\languagename>{%
        \let\\\@Alph\<bbl@cntr@\bbl@KVP@Alph @\languagename>}}%
  \fi
  % == require.babel in ini ==
  % To load or reaload the babel-*.tex, if require.babel in ini
  \ifx\bbl@beforestart\relax\else  % But not in doc aux or body
    \bbl@ifunset{bbl@rqtex@\languagename}{}%
      {\expandafter\ifx\csname bbl@rqtex@\languagename\endcsname\@empty\else
         \let\BabelBeforeIni\@gobbletwo
         \chardef\atcatcode=\catcode`\@
         \catcode`\@=11\relax
         \bbl@input@texini{\bbl@cs{rqtex@\languagename}}%
         \catcode`\@=\atcatcode
         \let\atcatcode\relax
         \global\bbl@csarg\let{rqtex@\languagename}\relax
       \fi}%
  \fi
  % == frenchspacing ==
  \ifcase\bbl@howloaded\in@true\else\in@false\fi
  \ifin@\else\bbl@xin@{typography/frenchspacing}{\bbl@key@list}\fi
  \ifin@
    \bbl@extras@wrap{\\\bbl@pre@fs}%
      {\bbl@pre@fs}%
      {\bbl@post@fs}%
  \fi
  % == Release saved transforms ==
  \bbl@release@transforms\relax % \relax closes the last item.
  % == main ==
  \ifx\bbl@KVP@main\@nil  % Restore only if not 'main'
    \let\languagename\bbl@savelangname
    \chardef\localeid\bbl@savelocaleid\relax
  \fi}
%    \end{macrocode}
%
% Depending on whether or not the language exists (based on
% |\date<language>|), we define two macros. Remember
% |\bbl@startcommands| opens a group.
%
%    \begin{macrocode}
\def\bbl@provide@new#1{%
  \@namedef{date#1}{}% marks lang exists - required by \StartBabelCommands
  \@namedef{extras#1}{}%
  \@namedef{noextras#1}{}%
  \bbl@startcommands*{#1}{captions}%
    \ifx\bbl@KVP@captions\@nil %      and also if import, implicit
      \def\bbl@tempb##1{%             elt for \bbl@captionslist
        \ifx##1\@empty\else
          \bbl@exp{%
            \\\SetString\\##1{%
              \\\bbl@nocaption{\bbl@stripslash##1}{#1\bbl@stripslash##1}}}%
          \expandafter\bbl@tempb
        \fi}%
      \expandafter\bbl@tempb\bbl@captionslist\@empty
    \else
      \ifx\bbl@initoload\relax
        \bbl@read@ini{\bbl@KVP@captions}2%  % Here letters cat = 11
      \else
        \bbl@read@ini{\bbl@initoload}2%     % Same
      \fi
    \fi
  \StartBabelCommands*{#1}{date}%
    \ifx\bbl@KVP@import\@nil
      \bbl@exp{%
        \\\SetString\\\today{\\\bbl@nocaption{today}{#1today}}}%
    \else
      \bbl@savetoday
      \bbl@savedate
    \fi
  \bbl@endcommands
  \bbl@load@basic{#1}%
  % == hyphenmins == (only if new)
  \bbl@exp{%
    \gdef\<#1hyphenmins>{%
      {\bbl@ifunset{bbl@lfthm@#1}{2}{\bbl@cs{lfthm@#1}}}%
      {\bbl@ifunset{bbl@rgthm@#1}{3}{\bbl@cs{rgthm@#1}}}}}%
  % == hyphenrules (also in renew) == 
  \bbl@provide@hyphens{#1}%
  \ifx\bbl@KVP@main\@nil\else
     \expandafter\main@language\expandafter{#1}%
  \fi}
%
\def\bbl@provide@renew#1{%
  \ifx\bbl@KVP@captions\@nil\else
    \StartBabelCommands*{#1}{captions}%
      \bbl@read@ini{\bbl@KVP@captions}2%   % Here all letters cat = 11
    \EndBabelCommands
 \fi
 \ifx\bbl@KVP@import\@nil\else
   \StartBabelCommands*{#1}{date}%
     \bbl@savetoday
     \bbl@savedate
   \EndBabelCommands
  \fi
  % == hyphenrules (also in new) ==
  \ifx\bbl@lbkflag\@empty
    \bbl@provide@hyphens{#1}%
  \fi}
%    \end{macrocode}
%
% Load the basic parameters (ids, typography, counters, and a few
% more), while captions and dates are left out. But it may happen some
% data has been loaded before automatically, so we first discard the
% saved values. (TODO. But preserving previous values would be useful.)
%
%    \begin{macrocode}
\def\bbl@load@basic#1{%
  \ifcase\bbl@howloaded\or\or
    \ifcase\csname bbl@llevel@\languagename\endcsname
      \bbl@csarg\let{lname@\languagename}\relax
    \fi
  \fi
  \bbl@ifunset{bbl@lname@#1}% 
    {\def\BabelBeforeIni##1##2{%
       \begingroup
         \let\bbl@ini@captions@aux\@gobbletwo
         \def\bbl@inidate ####1.####2.####3.####4\relax ####5####6{}%
         \bbl@read@ini{##1}1%
         \ifx\bbl@initoload\relax\endinput\fi
       \endgroup}%
     \begingroup       % boxed, to avoid extra spaces:
       \ifx\bbl@initoload\relax
         \bbl@input@texini{#1}%
       \else
         \setbox\z@\hbox{\BabelBeforeIni{\bbl@initoload}{}}%
       \fi
     \endgroup}%
    {}}
%    \end{macrocode}
%
% The |hyphenrules| option is handled with an auxiliary macro.
%
%    \begin{macrocode}
\def\bbl@provide@hyphens#1{%
  \let\bbl@tempa\relax
  \ifx\bbl@KVP@hyphenrules\@nil\else
    \bbl@replace\bbl@KVP@hyphenrules{ }{,}%
    \bbl@foreach\bbl@KVP@hyphenrules{%
      \ifx\bbl@tempa\relax    %  if not yet found
        \bbl@ifsamestring{##1}{+}%
          {{\bbl@exp{\\\addlanguage\<l@##1>}}}%
          {}%
        \bbl@ifunset{l@##1}%
          {}%
          {\bbl@exp{\let\bbl@tempa\<l@##1>}}%
      \fi}%
  \fi
  \ifx\bbl@tempa\relax %         if no opt or no language in opt found
    \ifx\bbl@KVP@import\@nil
      \ifx\bbl@initoload\relax\else
        \bbl@exp{%               and hyphenrules is not empty
          \\\bbl@ifblank{\bbl@cs{hyphr@#1}}%
            {}%
            {\let\\\bbl@tempa\<l@\bbl@cl{hyphr}>}}%
      \fi 
    \else % if importing
      \bbl@exp{%                    and hyphenrules is not empty
        \\\bbl@ifblank{\bbl@cs{hyphr@#1}}%
          {}%
          {\let\\\bbl@tempa\<l@\bbl@cl{hyphr}>}}%
    \fi
  \fi
  \bbl@ifunset{bbl@tempa}%       ie, relax or undefined
    {\bbl@ifunset{l@#1}%         no hyphenrules found - fallback
       {\bbl@exp{\\\adddialect\<l@#1>\language}}%
       {}}%                      so, l@<lang> is ok - nothing to do
    {\bbl@exp{\\\adddialect\<l@#1>\bbl@tempa}}}% found in opt list or ini
%    \end{macrocode}
%
% The reader of |babel-...tex| files. We reset temporarily some
% catcodes.
%
%    \begin{macrocode}
\def\bbl@input@texini#1{%
  \bbl@bsphack
    \bbl@exp{%
      \catcode`\\\%=14 \catcode`\\\\=0
      \catcode`\\\{=1  \catcode`\\\}=2 
      \lowercase{\\\InputIfFileExists{babel-#1.tex}{}{}}%
      \catcode`\\\%=\the\catcode`\%\relax
      \catcode`\\\\=\the\catcode`\\\relax
      \catcode`\\\{=\the\catcode`\{\relax
      \catcode`\\\}=\the\catcode`\}\relax}%
  \bbl@esphack}
%    \end{macrocode}
%
% The following macros read and store |ini| files (but don't process
% them). For each line, there are 3 possible actions: ignore if starts
% with |;|, switch section if starts with |[|, and store otherwise.
% There are used in the first step of |\bbl@read@ini|.
%
%    \begin{macrocode}
\def\bbl@iniline#1\bbl@iniline{%
  \@ifnextchar[\bbl@inisect{\@ifnextchar;\bbl@iniskip\bbl@inistore}#1\@@}% ]
\def\bbl@inisect[#1]#2\@@{\def\bbl@section{#1}} 
\def\bbl@iniskip#1\@@{}%      if starts with ;
\def\bbl@inistore#1=#2\@@{%      full (default)
  \bbl@trim@def\bbl@tempa{#1}%
  \bbl@trim\toks@{#2}%
  \bbl@xin@{;\bbl@section/\bbl@tempa;}{\bbl@key@list}%
  \ifin@\else
    \bbl@exp{%
      \\\g@addto@macro\\\bbl@inidata{%
        \\\bbl@elt{\bbl@section}{\bbl@tempa}{\the\toks@}}}%
  \fi}
\def\bbl@inistore@min#1=#2\@@{%  minimal (maybe set in \bbl@read@ini)
  \bbl@trim@def\bbl@tempa{#1}%
  \bbl@trim\toks@{#2}%
  \bbl@xin@{.identification.}{.\bbl@section.}%
  \ifin@
    \bbl@exp{\\\g@addto@macro\\\bbl@inidata{%
      \\\bbl@elt{identification}{\bbl@tempa}{\the\toks@}}}%
  \fi}
%    \end{macrocode}
%
% Now, the ‘main loop’, which \textbf{**must be executed inside a
% group**}. At this point, |\bbl@inidata| may contain data declared in
% |\babelprovide|, with ‘slashed’ keys. There are 3 steps: first read
% the ini file and store it; then traverse the stored values, and
% process some groups if required (date, captions, labels, counters);
% finally, ‘export’ some values by defining global macros
% (identification, typography, characters, numbers). The second
% argument is 0 when called to read the minimal data for fonts; with
% |\babelprovide| it's either 1 or 2.
%
%    \begin{macrocode}
\ifx\bbl@readstream\@undefined
  \csname newread\endcsname\bbl@readstream
\fi
\def\bbl@read@ini#1#2{%
  \global\let\bbl@extend@ini\@gobble
  \openin\bbl@readstream=babel-#1.ini
  \ifeof\bbl@readstream
    \bbl@error
      {There is no ini file for the requested language\\%
       (#1). Perhaps you misspelled it or your installation\\%
       is not complete.}%
      {Fix the name or reinstall babel.}%
  \else
    % == Store ini data in \bbl@inidata ==
    \catcode`\[=12 \catcode`\]=12 \catcode`\==12 \catcode`\&=12
    \catcode`\;=12 \catcode`\|=12 \catcode`\%=14 \catcode`\-=12
    \bbl@info{Importing
                \ifcase#2font and identification \or basic \fi
                 data for \languagename\\%
              from babel-#1.ini. Reported}%
    \ifnum#2=\z@
      \global\let\bbl@inidata\@empty
      \let\bbl@inistore\bbl@inistore@min    % Remember it's local
    \fi
    \def\bbl@section{identification}%
    \bbl@exp{\\\bbl@inistore tag.ini=#1\\\@@}%
    \bbl@inistore load.level=#2\@@
    \loop
    \if T\ifeof\bbl@readstream F\fi T\relax % Trick, because inside \loop
      \endlinechar\m@ne
      \read\bbl@readstream to \bbl@line
      \endlinechar`\^^M
      \ifx\bbl@line\@empty\else
        \expandafter\bbl@iniline\bbl@line\bbl@iniline
      \fi
    \repeat
    % == Process stored data ==
    \bbl@csarg\xdef{lini@\languagename}{#1}%
    \bbl@read@ini@aux
    % == 'Export' data ==
    \bbl@ini@exports{#2}%
    \global\bbl@csarg\let{inidata@\languagename}\bbl@inidata
    \global\let\bbl@inidata\@empty
    \bbl@exp{\\\bbl@add@list\\\bbl@ini@loaded{\languagename}}%
    \bbl@toglobal\bbl@ini@loaded
  \fi}
\def\bbl@read@ini@aux{%
  \let\bbl@savestrings\@empty
  \let\bbl@savetoday\@empty
  \let\bbl@savedate\@empty
  \def\bbl@elt##1##2##3{%
    \def\bbl@section{##1}%
    \in@{=date.}{=##1}% Find a better place
    \ifin@
      \bbl@ini@calendar{##1}%
    \fi
    \bbl@ifunset{bbl@inikv@##1}{}%
      {\csname bbl@inikv@##1\endcsname{##2}{##3}}}%
  \bbl@inidata}
%    \end{macrocode}
%
% A variant to be used when the ini file has been already loaded,
% because it's not the first |\babelprovide| for this language.
%
%    \begin{macrocode}
\def\bbl@extend@ini@aux#1{%
  \bbl@startcommands*{#1}{captions}%
    % Activate captions/... and modify exports
    \bbl@csarg\def{inikv@captions.licr}##1##2{%
      \setlocalecaption{#1}{##1}{##2}}%
    \def\bbl@inikv@captions##1##2{%
      \bbl@ini@captions@aux{##1}{##2}}%
    \def\bbl@stringdef##1##2{\gdef##1{##2}}% 
    \def\bbl@exportkey##1##2##3{%
      \bbl@ifunset{bbl@@kv@##2}{}%
        {\expandafter\ifx\csname bbl@@kv@##2\endcsname\@empty\else
           \bbl@exp{\global\let\<bbl@##1@\languagename>\<bbl@@kv@##2>}%
         \fi}}%
    % As with \bbl@read@ini, but with some changes
    \bbl@read@ini@aux
    \bbl@ini@exports\tw@
    % Update inidata@lang by pretending the ini is read.
    \def\bbl@elt##1##2##3{%
      \def\bbl@section{##1}%
      \bbl@iniline##2=##3\bbl@iniline}%
    \csname bbl@inidata@#1\endcsname
    \global\bbl@csarg\let{inidata@#1}\bbl@inidata
  \StartBabelCommands*{#1}{date}% And from the import stuff
    \def\bbl@stringdef##1##2{\gdef##1{##2}}%
    \bbl@savetoday
    \bbl@savedate
  \bbl@endcommands}
%    \end{macrocode}
%
% A somewhat hackish tool to handle calendar sections. To be improved.
%
%    \begin{macrocode}
\def\bbl@ini@calendar#1{%
 \lowercase{\def\bbl@tempa{=#1=}}%
 \bbl@replace\bbl@tempa{=date.gregorian}{}%
 \bbl@replace\bbl@tempa{=date.}{}%
 \in@{.licr=}{#1=}%
 \ifin@
   \ifcase\bbl@engine
     \bbl@replace\bbl@tempa{.licr=}{}%
   \else
     \let\bbl@tempa\relax
   \fi
 \fi
 \ifx\bbl@tempa\relax\else
   \bbl@replace\bbl@tempa{=}{}%
   \bbl@exp{%
     \def\<bbl@inikv@#1>####1####2{% 
       \\\bbl@inidate####1...\relax{####2}{\bbl@tempa}}}%
 \fi}
%    \end{macrocode}
%
% A key with a slash in |\babelprovide| replaces the value in the |ini|
% file (which is ignored altogether). The mechanism is simple (but
% suboptimal): add the data to the |ini| one (at this point the |ini|
% file has not yet been read), and define a dummy macro. When the |ini|
% file is read, just skip the corresponding key and reset the macro (in
% |\bbl@inistore| above).
% 
%
%    \begin{macrocode}
\def\bbl@renewinikey#1/#2\@@#3{%
  \edef\bbl@tempa{\zap@space #1 \@empty}%   section
  \edef\bbl@tempb{\zap@space #2 \@empty}%   key
  \bbl@trim\toks@{#3}%                      value
  \bbl@exp{%
    \edef\\\bbl@key@list{\bbl@key@list \bbl@tempa/\bbl@tempb;}%
    \\\g@addto@macro\\\bbl@inidata{%
       \\\bbl@elt{\bbl@tempa}{\bbl@tempb}{\the\toks@}}}}%
%    \end{macrocode}
%
% The previous assignments are local, so we need to export them. If
% the value is empty, we can provide a default value.
%
%    \begin{macrocode}
\def\bbl@exportkey#1#2#3{%
  \bbl@ifunset{bbl@@kv@#2}%
    {\bbl@csarg\gdef{#1@\languagename}{#3}}%
    {\expandafter\ifx\csname bbl@@kv@#2\endcsname\@empty
       \bbl@csarg\gdef{#1@\languagename}{#3}%
     \else
       \bbl@exp{\global\let\<bbl@#1@\languagename>\<bbl@@kv@#2>}%
     \fi}}
%    \end{macrocode}
%
% Key-value pairs are treated differently depending on the section in
% the |ini| file. The following macros are the readers for
% |identification| and |typography|. Note |\bbl@ini@exports|
% is called always (via |\bbl@inisec|), while |\bbl@after@ini| must be
% called explicitly after |\bbl@read@ini| if necessary.
%
%    \begin{macrocode}
\def\bbl@iniwarning#1{%
  \bbl@ifunset{bbl@@kv@identification.warning#1}{}%
    {\bbl@warning{%
       From babel-\bbl@cs{lini@\languagename}.ini:\\%
       \bbl@cs{@kv@identification.warning#1}\\%
       Reported }}}
%
\let\bbl@release@transforms\@empty
%
\def\bbl@ini@exports#1{%
  % Identification always exported
  \bbl@iniwarning{}%
  \ifcase\bbl@engine
    \bbl@iniwarning{.pdflatex}%
  \or
    \bbl@iniwarning{.lualatex}%
  \or
    \bbl@iniwarning{.xelatex}%
  \fi%
  \bbl@exportkey{llevel}{identification.load.level}{}%
  \bbl@exportkey{elname}{identification.name.english}{}%
  \bbl@exp{\\\bbl@exportkey{lname}{identification.name.opentype}%
    {\csname bbl@elname@\languagename\endcsname}}%
  \bbl@exportkey{tbcp}{identification.tag.bcp47}{}%
  \bbl@exportkey{lbcp}{identification.language.tag.bcp47}{}%
  \bbl@exportkey{lotf}{identification.tag.opentype}{dflt}%
  \bbl@exportkey{esname}{identification.script.name}{}%
  \bbl@exp{\\\bbl@exportkey{sname}{identification.script.name.opentype}%
    {\csname bbl@esname@\languagename\endcsname}}%
  \bbl@exportkey{sbcp}{identification.script.tag.bcp47}{}%
  \bbl@exportkey{sotf}{identification.script.tag.opentype}{DFLT}%
  % Also maps bcp47 -> languagename
  \ifbbl@bcptoname
    \bbl@csarg\xdef{bcp@map@\bbl@cl{tbcp}}{\languagename}%
  \fi
  % Conditional
  \ifnum#1>\z@         % 0 = only info, 1, 2 = basic, (re)new
    \bbl@exportkey{lnbrk}{typography.linebreaking}{h}%
    \bbl@exportkey{hyphr}{typography.hyphenrules}{}%
    \bbl@exportkey{lfthm}{typography.lefthyphenmin}{2}%
    \bbl@exportkey{rgthm}{typography.righthyphenmin}{3}%         
    \bbl@exportkey{prehc}{typography.prehyphenchar}{}%
    \bbl@exportkey{hyotl}{typography.hyphenate.other.locale}{}%
    \bbl@exportkey{hyots}{typography.hyphenate.other.script}{}%
    \bbl@exportkey{intsp}{typography.intraspace}{}%
    \bbl@exportkey{frspc}{typography.frenchspacing}{u}%
    \bbl@exportkey{chrng}{characters.ranges}{}%
    \bbl@exportkey{dgnat}{numbers.digits.native}{}%
    \ifnum#1=\tw@           % only (re)new
      \bbl@exportkey{rqtex}{identification.require.babel}{}%
      \bbl@toglobal\bbl@savetoday
      \bbl@toglobal\bbl@savedate
      \bbl@savestrings
    \fi
  \fi}
%    \end{macrocode}
%
% A shared handler for key=val lines to be stored in
% |\bbl@@kv@<section>.<key>|.
%
%    \begin{macrocode}
\def\bbl@inikv#1#2{%     key=value
  \toks@{#2}%            This hides #'s from ini values
  \bbl@csarg\edef{@kv@\bbl@section.#1}{\the\toks@}}
%    \end{macrocode}
%
% By default, the following sections are just read. Actions are taken
% later.
%
%    \begin{macrocode}
\let\bbl@inikv@identification\bbl@inikv
\let\bbl@inikv@typography\bbl@inikv
\let\bbl@inikv@characters\bbl@inikv
\let\bbl@inikv@numbers\bbl@inikv
%    \end{macrocode}
%
% Additive numerals require an additional definition. When |.1| is
% found, two macros are defined -- the basic one, without |.1| called
% by |\localenumeral|, and another one preserving the trailing |.1| for
% the ‘units’. 
%
%    \begin{macrocode}
\def\bbl@inikv@counters#1#2{%
  \bbl@ifsamestring{#1}{digits}%
    {\bbl@error{The counter name 'digits' is reserved for mapping\\%
                decimal digits}%
               {Use another name.}}%
    {}%
  \def\bbl@tempc{#1}%
  \bbl@trim@def{\bbl@tempb*}{#2}%
  \in@{.1$}{#1$}%
  \ifin@
    \bbl@replace\bbl@tempc{.1}{}%
    \bbl@csarg\protected@xdef{cntr@\bbl@tempc @\languagename}{%
      \noexpand\bbl@alphnumeral{\bbl@tempc}}%
  \fi
  \in@{.F.}{#1}%
  \ifin@\else\in@{.S.}{#1}\fi
  \ifin@
    \bbl@csarg\protected@xdef{cntr@#1@\languagename}{\bbl@tempb*}%
  \else
    \toks@{}% Required by \bbl@buildifcase, which returns \bbl@tempa
    \expandafter\bbl@buildifcase\bbl@tempb* \\ % Space after \\
    \bbl@csarg{\global\expandafter\let}{cntr@#1@\languagename}\bbl@tempa
  \fi}
%    \end{macrocode}
%
% Now |captions| and |captions.licr|, depending on the engine. And
% below also for dates. They rely on a few auxiliary macros. It is
% expected the ini file provides the complete set in Unicode and LICR,
% in that order.
%
%    \begin{macrocode}
\ifcase\bbl@engine
  \bbl@csarg\def{inikv@captions.licr}#1#2{%
    \bbl@ini@captions@aux{#1}{#2}}
\else
  \def\bbl@inikv@captions#1#2{%
    \bbl@ini@captions@aux{#1}{#2}}
\fi
%    \end{macrocode}
%
% The auxiliary macro for captions define |\<caption>name|.
%
%    \begin{macrocode}
\def\bbl@ini@captions@template#1#2{% string language tempa=capt-name
  \bbl@replace\bbl@tempa{.template}{}%
  \def\bbl@toreplace{#1{}}%
  \bbl@replace\bbl@toreplace{[ ]}{\nobreakspace{}}%
  \bbl@replace\bbl@toreplace{[[}{\csname}%
  \bbl@replace\bbl@toreplace{[}{\csname the}% 
  \bbl@replace\bbl@toreplace{]]}{name\endcsname{}}%
  \bbl@replace\bbl@toreplace{]}{\endcsname{}}% 
  \bbl@xin@{,\bbl@tempa,}{,chapter,appendix,part,}%
  \ifin@
    \@nameuse{bbl@patch\bbl@tempa}%
    \global\bbl@csarg\let{\bbl@tempa fmt@#2}\bbl@toreplace
  \fi 
  \bbl@xin@{,\bbl@tempa,}{,figure,table,}%
  \ifin@
    \toks@\expandafter{\bbl@toreplace}%
    \bbl@exp{\gdef\<fnum@\bbl@tempa>{\the\toks@}}%
  \fi}
\def\bbl@ini@captions@aux#1#2{%
  \bbl@trim@def\bbl@tempa{#1}%
  \bbl@xin@{.template}{\bbl@tempa}%
  \ifin@
    \bbl@ini@captions@template{#2}\languagename
  \else
    \bbl@ifblank{#2}%
      {\bbl@exp{%
         \toks@{\\\bbl@nocaption{\bbl@tempa}{\languagename\bbl@tempa name}}}}%
      {\bbl@trim\toks@{#2}}%
    \bbl@exp{%
      \\\bbl@add\\\bbl@savestrings{%
        \\\SetString\<\bbl@tempa name>{\the\toks@}}}%
    \toks@\expandafter{\bbl@captionslist}%
    \bbl@exp{\\\in@{\<\bbl@tempa name>}{\the\toks@}}%
    \ifin@\else
      \bbl@exp{%
        \\\bbl@add\<bbl@extracaps@\languagename>{\<\bbl@tempa name>}%
        \\\bbl@toglobal\<bbl@extracaps@\languagename>}%
    \fi
  \fi}
%    \end{macrocode}
%
% \textbf{Labels.} Captions must contain just strings, no
% format at all, so there is new group in ini files. 
% 
%    \begin{macrocode}
\def\bbl@list@the{%
  part,chapter,section,subsection,subsubsection,paragraph,%
  subparagraph,enumi,enumii,enumiii,enumiv,equation,figure,%
  table,page,footnote,mpfootnote,mpfn}
\def\bbl@map@cnt#1{%  #1:roman,etc, // #2:enumi,etc
  \bbl@ifunset{bbl@map@#1@\languagename}%
    {\@nameuse{#1}}%
    {\@nameuse{bbl@map@#1@\languagename}}}
\def\bbl@inikv@labels#1#2{%
  \in@{.map}{#1}%
  \ifin@
    \ifx\bbl@KVP@labels\@nil\else
      \bbl@xin@{ map }{ \bbl@KVP@labels\space}%
      \ifin@
        \def\bbl@tempc{#1}%
        \bbl@replace\bbl@tempc{.map}{}%
        \in@{,#2,}{,arabic,roman,Roman,alph,Alph,fnsymbol,}%
        \bbl@exp{%
          \gdef\<bbl@map@\bbl@tempc @\languagename>%
            {\ifin@\<#2>\else\\\localecounter{#2}\fi}}%
        \bbl@foreach\bbl@list@the{%
          \bbl@ifunset{the##1}{}%
            {\bbl@exp{\let\\\bbl@tempd\<the##1>}%
             \bbl@exp{%
               \\\bbl@sreplace\<the##1>%
                 {\<\bbl@tempc>{##1}}{\\\bbl@map@cnt{\bbl@tempc}{##1}}%
               \\\bbl@sreplace\<the##1>%
                 {\<\@empty @\bbl@tempc>\<c@##1>}{\\\bbl@map@cnt{\bbl@tempc}{##1}}}%
             \expandafter\ifx\csname the##1\endcsname\bbl@tempd\else
               \toks@\expandafter\expandafter\expandafter{%
                 \csname the##1\endcsname}%
               \expandafter\xdef\csname the##1\endcsname{{\the\toks@}}%
             \fi}}%
      \fi
    \fi
  %
  \else
    %
    % The following code is still under study. You can test it and make
    % suggestions. Eg, enumerate.2 = ([enumi]).([enumii]). It's
    % language dependent.
    \in@{enumerate.}{#1}%
    \ifin@
      \def\bbl@tempa{#1}%
      \bbl@replace\bbl@tempa{enumerate.}{}%
      \def\bbl@toreplace{#2}%
      \bbl@replace\bbl@toreplace{[ ]}{\nobreakspace{}}%
      \bbl@replace\bbl@toreplace{[}{\csname the}% 
      \bbl@replace\bbl@toreplace{]}{\endcsname{}}% 
      \toks@\expandafter{\bbl@toreplace}%
      % TODO. Execute only once:
      \bbl@exp{%
        \\\bbl@add\<extras\languagename>{%
          \\\babel@save\<labelenum\romannumeral\bbl@tempa>%
          \def\<labelenum\romannumeral\bbl@tempa>{\the\toks@}}%
        \\\bbl@toglobal\<extras\languagename>}%
    \fi
  \fi}
%    \end{macrocode}
%
% To show correctly some captions in a few languages, we need to patch
% some internal macros, because the order is hardcoded. For example, in
% Japanese the chapter number is surrounded by two string, while in
% Hungarian is placed after. These replacement works in many classes,
% but not all. Actually, the following lines are somewhat tentative.
%
%    \begin{macrocode}
\def\bbl@chaptype{chapter}
\ifx\@makechapterhead\@undefined
  \let\bbl@patchchapter\relax
\else\ifx\thechapter\@undefined
  \let\bbl@patchchapter\relax
\else\ifx\ps@headings\@undefined
  \let\bbl@patchchapter\relax
\else
  \def\bbl@patchchapter{%
    \global\let\bbl@patchchapter\relax
    \bbl@add\appendix{\def\bbl@chaptype{appendix}}% Not harmful, I hope
    \bbl@toglobal\appendix
    \bbl@sreplace\ps@headings
      {\@chapapp\ \thechapter}%
      {\bbl@chapterformat}%  
    \bbl@toglobal\ps@headings
    \bbl@sreplace\chaptermark
      {\@chapapp\ \thechapter}%
      {\bbl@chapterformat}%  
    \bbl@toglobal\chaptermark
    \bbl@sreplace\@makechapterhead
      {\@chapapp\space\thechapter}%
      {\bbl@chapterformat}%
    \bbl@toglobal\@makechapterhead
    \gdef\bbl@chapterformat{%
      \bbl@ifunset{bbl@\bbl@chaptype fmt@\languagename}%
        {\@chapapp\space\thechapter}
        {\@nameuse{bbl@\bbl@chaptype fmt@\languagename}}}}
  \let\bbl@patchappendix\bbl@patchchapter
\fi\fi\fi
\ifx\@part\@undefined
  \let\bbl@patchpart\relax
\else
  \def\bbl@patchpart{%
    \global\let\bbl@patchpart\relax
    \bbl@sreplace\@part
      {\partname\nobreakspace\thepart}%
      {\bbl@partformat}%
    \bbl@toglobal\@part
    \gdef\bbl@partformat{%
      \bbl@ifunset{bbl@partfmt@\languagename}%
        {\partname\nobreakspace\thepart}
        {\@nameuse{bbl@partfmt@\languagename}}}}
\fi
%    \end{macrocode}
%
% \textbf{Date.} TODO. Document
%
%    \begin{macrocode}
% Arguments are _not_ protected.
\let\bbl@calendar\@empty
\DeclareRobustCommand\localedate[1][]{\bbl@localedate{#1}}
\def\bbl@localedate#1#2#3#4{%
  \begingroup
    \ifx\@empty#1\@empty\else
      \let\bbl@ld@calendar\@empty
      \let\bbl@ld@variant\@empty
      \edef\bbl@tempa{\zap@space#1 \@empty}%
      \def\bbl@tempb##1=##2\@@{\@namedef{bbl@ld@##1}{##2}}%
      \bbl@foreach\bbl@tempa{\bbl@tempb##1\@@}%
      \edef\bbl@calendar{%
        \bbl@ld@calendar
        \ifx\bbl@ld@variant\@empty\else
          .\bbl@ld@variant
        \fi}%
      \bbl@replace\bbl@calendar{gregorian}{}%
    \fi
    \bbl@cased
      {\@nameuse{bbl@date@\languagename @\bbl@calendar}{#2}{#3}{#4}}%
  \endgroup}
% eg: 1=months, 2=wide, 3=1, 4=dummy, 5=value, 6=calendar
\def\bbl@inidate#1.#2.#3.#4\relax#5#6{% TODO - ignore with 'captions'
  \bbl@trim@def\bbl@tempa{#1.#2}%
  \bbl@ifsamestring{\bbl@tempa}{months.wide}%      to savedate
    {\bbl@trim@def\bbl@tempa{#3}%
     \bbl@trim\toks@{#5}%
     \@temptokena\expandafter{\bbl@savedate}%
     \bbl@exp{%   Reverse order - in ini last wins
       \def\\\bbl@savedate{%
         \\\SetString\<month\romannumeral\bbl@tempa#6name>{\the\toks@}%
         \the\@temptokena}}}%
    {\bbl@ifsamestring{\bbl@tempa}{date.long}%     defined now
      {\lowercase{\def\bbl@tempb{#6}}%
       \bbl@trim@def\bbl@toreplace{#5}%
       \bbl@TG@@date
       \bbl@ifunset{bbl@date@\languagename @}%
         {\bbl@exp{% TODO. Move to a better place.
            \gdef\<\languagename date>{\\\protect\<\languagename date >}%
            \gdef\<\languagename date >####1####2####3{%
              \\\bbl@usedategrouptrue
              \<bbl@ensure@\languagename>{%
                \\\localedate{####1}{####2}{####3}}}%
            \\\bbl@add\\\bbl@savetoday{%
              \\\SetString\\\today{%
                \<\languagename date>%
                   {\\\the\year}{\\\the\month}{\\\the\day}}}}}%
         {}%      
       \global\bbl@csarg\let{date@\languagename @}\bbl@toreplace
       \ifx\bbl@tempb\@empty\else
         \global\bbl@csarg\let{date@\languagename @\bbl@tempb}\bbl@toreplace
       \fi}%
      {}}}
%    \end{macrocode}
%
% \textbf{Dates} will require some macros for the basic formatting.
% They may be redefined by language, so ``semi-public'' names (camel
% case) are used. Oddly enough, the CLDR places particles like “de”
% inconsistently in either in the date or in the month name.
%
%    \begin{macrocode}
\let\bbl@calendar\@empty
\newcommand\BabelDateSpace{\nobreakspace}
\newcommand\BabelDateDot{.\@}  % TODO. \let instead of repeating
\newcommand\BabelDated[1]{{\number#1}}
\newcommand\BabelDatedd[1]{{\ifnum#1<10 0\fi\number#1}}
\newcommand\BabelDateM[1]{{\number#1}}
\newcommand\BabelDateMM[1]{{\ifnum#1<10 0\fi\number#1}}
\newcommand\BabelDateMMMM[1]{{%
  \csname month\romannumeral#1\bbl@calendar name\endcsname}}%
\newcommand\BabelDatey[1]{{\number#1}}%
\newcommand\BabelDateyy[1]{{%
  \ifnum#1<10 0\number#1 %
  \else\ifnum#1<100 \number#1 %
  \else\ifnum#1<1000 \expandafter\@gobble\number#1 %
  \else\ifnum#1<10000 \expandafter\@gobbletwo\number#1 %
  \else
    \bbl@error
      {Currently two-digit years are restricted to the\\
       range 0-9999.}%
      {There is little you can do. Sorry.}%
  \fi\fi\fi\fi}}
\newcommand\BabelDateyyyy[1]{{\number#1}} % FIXME - add leading 0
\def\bbl@replace@finish@iii#1{%
  \bbl@exp{\def\\#1####1####2####3{\the\toks@}}}
\def\bbl@TG@@date{%
  \bbl@replace\bbl@toreplace{[ ]}{\BabelDateSpace{}}%
  \bbl@replace\bbl@toreplace{[.]}{\BabelDateDot{}}%
  \bbl@replace\bbl@toreplace{[d]}{\BabelDated{####3}}%
  \bbl@replace\bbl@toreplace{[dd]}{\BabelDatedd{####3}}%
  \bbl@replace\bbl@toreplace{[M]}{\BabelDateM{####2}}%
  \bbl@replace\bbl@toreplace{[MM]}{\BabelDateMM{####2}}%
  \bbl@replace\bbl@toreplace{[MMMM]}{\BabelDateMMMM{####2}}%
  \bbl@replace\bbl@toreplace{[y]}{\BabelDatey{####1}}%
  \bbl@replace\bbl@toreplace{[yy]}{\BabelDateyy{####1}}%
  \bbl@replace\bbl@toreplace{[yyyy]}{\BabelDateyyyy{####1}}%
  \bbl@replace\bbl@toreplace{[y|}{\bbl@datecntr[####1|}%
  \bbl@replace\bbl@toreplace{[m|}{\bbl@datecntr[####2|}%
  \bbl@replace\bbl@toreplace{[d|}{\bbl@datecntr[####3|}%
% Note after \bbl@replace \toks@ contains the resulting string.
% TODO - Using this implicit behavior doesn't seem a good idea.
  \bbl@replace@finish@iii\bbl@toreplace}
\def\bbl@datecntr{\expandafter\bbl@xdatecntr\expandafter}
\def\bbl@xdatecntr[#1|#2]{\localenumeral{#2}{#1}}
%    \end{macrocode}
%
% \textbf{Transforms.}
%
%    \begin{macrocode}
\let\bbl@release@transforms\@empty
\@namedef{bbl@inikv@transforms.prehyphenation}{%
  \bbl@transforms\babelprehyphenation}
\@namedef{bbl@inikv@transforms.posthyphenation}{%
  \bbl@transforms\babelposthyphenation}
\def\bbl@transforms@aux#1#2#3,#4\relax{#1{#2}{#3}{#4}}
\begingroup
  \catcode`\%=12
  \catcode`\&=14
  \gdef\bbl@transforms#1#2#3{&%
    \ifx\bbl@KVP@transforms\@nil\else
      \directlua{
         str = [==[#2]==]
         str = str:gsub('%.%d+%.%d+$', '')
         tex.print([[\def\string\babeltempa{]] .. str .. [[}]])
      }&%
      \bbl@xin@{,\babeltempa,}{,\bbl@KVP@transforms,}&%
      \ifin@
        \in@{.0$}{#2$}&%
        \ifin@
           \g@addto@macro\bbl@release@transforms{&%
              \relax\bbl@transforms@aux#1{\languagename}{#3}}&%
        \else
           \g@addto@macro\bbl@release@transforms{, {#3}}&%
        \fi
      \fi
    \fi}
\endgroup
%    \end{macrocode}
%
% Language and Script values to be used when defining a font or
% setting the direction are set with the following macros.
%
%    \begin{macrocode}
\def\bbl@provide@lsys#1{%
  \bbl@ifunset{bbl@lname@#1}%
    {\bbl@load@info{#1}}%
    {}%
  \bbl@csarg\let{lsys@#1}\@empty
  \bbl@ifunset{bbl@sname@#1}{\bbl@csarg\gdef{sname@#1}{Default}}{}%
  \bbl@ifunset{bbl@sotf@#1}{\bbl@csarg\gdef{sotf@#1}{DFLT}}{}%
  \bbl@csarg\bbl@add@list{lsys@#1}{Script=\bbl@cs{sname@#1}}%
  \bbl@ifunset{bbl@lname@#1}{}%
    {\bbl@csarg\bbl@add@list{lsys@#1}{Language=\bbl@cs{lname@#1}}}%
  \ifcase\bbl@engine\or\or
    \bbl@ifunset{bbl@prehc@#1}{}%
      {\bbl@exp{\\\bbl@ifblank{\bbl@cs{prehc@#1}}}%
        {}%
        {\ifx\bbl@xenohyph\@undefined
           \let\bbl@xenohyph\bbl@xenohyph@d
           \ifx\AtBeginDocument\@notprerr
             \expandafter\@secondoftwo  % to execute right now
           \fi
           \AtBeginDocument{%
             \expandafter\bbl@add
             \csname selectfont \endcsname{\bbl@xenohyph}%
             \expandafter\selectlanguage\expandafter{\languagename}%
             \expandafter\bbl@toglobal\csname selectfont \endcsname}%
        \fi}}%
  \fi
  \bbl@csarg\bbl@toglobal{lsys@#1}}
\def\bbl@xenohyph@d{%
  \bbl@ifset{bbl@prehc@\languagename}%
    {\ifnum\hyphenchar\font=\defaulthyphenchar
       \iffontchar\font\bbl@cl{prehc}\relax
         \hyphenchar\font\bbl@cl{prehc}\relax
       \else\iffontchar\font"200B
         \hyphenchar\font"200B
       \else
         \bbl@warning
           {Neither 0 nor ZERO WIDTH SPACE are available\\%
            in the current font, and therefore the hyphen\\%
            will be printed. Try changing the fontspec's\\%
            'HyphenChar' to another value, but be aware\\%
            this setting is not safe (see the manual)}%
         \hyphenchar\font\defaulthyphenchar     
       \fi\fi
     \fi}%
    {\hyphenchar\font\defaulthyphenchar}}
  % \fi}
%    \end{macrocode}
%
% The following |ini| reader ignores everything but the
% |identification| section. It is called when a font is defined (ie,
% when the language is first selected) to know which script/language
% must be enabled. This means we must make sure a few characters are
% not active. The |ini| is not read directly, but with a proxy |tex|
% file named as the language (which means any code in it must be
% skipped, too).
%
%    \begin{macrocode}
\def\bbl@load@info#1{%
  \def\BabelBeforeIni##1##2{%
    \begingroup
      \bbl@read@ini{##1}0%
      \endinput          % babel- .tex may contain onlypreamble's
    \endgroup}%            boxed, to avoid extra spaces:
  {\bbl@input@texini{#1}}}
%    \end{macrocode}
%
% A tool to define the macros for native digits from the list provided 
% in the |ini| file. Somewhat convoluted because there are 10 digits, 
% but only 9 arguments in \TeX. Non-digits characters are kept. The
% first macro is the generic “localized” command.
%
%    \begin{macrocode}
\def\bbl@setdigits#1#2#3#4#5{%
  \bbl@exp{%
    \def\<\languagename digits>####1{%       ie, \langdigits
      \<bbl@digits@\languagename>####1\\\@nil}%
    \let\<bbl@cntr@digits@\languagename>\<\languagename digits>%
    \def\<\languagename counter>####1{%      ie, \langcounter
      \\\expandafter\<bbl@counter@\languagename>%
      \\\csname c@####1\endcsname}%
    \def\<bbl@counter@\languagename>####1{% ie, \bbl@counter@lang
      \\\expandafter\<bbl@digits@\languagename>%
      \\\number####1\\\@nil}}%
  \def\bbl@tempa##1##2##3##4##5{%
    \bbl@exp{%    Wow, quite a lot of hashes! :-(
      \def\<bbl@digits@\languagename>########1{%
       \\\ifx########1\\\@nil              % ie, \bbl@digits@lang
       \\\else
         \\\ifx0########1#1%
         \\\else\\\ifx1########1#2%
         \\\else\\\ifx2########1#3%
         \\\else\\\ifx3########1#4%
         \\\else\\\ifx4########1#5%
         \\\else\\\ifx5########1##1%
         \\\else\\\ifx6########1##2%
         \\\else\\\ifx7########1##3%
         \\\else\\\ifx8########1##4%
         \\\else\\\ifx9########1##5%
         \\\else########1%
         \\\fi\\\fi\\\fi\\\fi\\\fi\\\fi\\\fi\\\fi\\\fi\\\fi
         \\\expandafter\<bbl@digits@\languagename>%
       \\\fi}}}%
  \bbl@tempa}
%    \end{macrocode}
%
% Alphabetic counters must be converted from a space separated list to
% an |\ifcase| structure.
%
%    \begin{macrocode}
\def\bbl@buildifcase#1 {% Returns \bbl@tempa, requires \toks@={}
  \ifx\\#1%             % \\ before, in case #1 is multiletter
    \bbl@exp{%
      \def\\\bbl@tempa####1{%
        \<ifcase>####1\space\the\toks@\<else>\\\@ctrerr\<fi>}}%
  \else
    \toks@\expandafter{\the\toks@\or #1}%
    \expandafter\bbl@buildifcase
  \fi}
%    \end{macrocode}
%
% The code for additive counters is somewhat tricky and it's based on
% the fact the arguments just before |\@@| collects digits which have
% been left ‘unused’ in previous arguments, the first of them being the
% number of digits in the number to be converted. This explains the
% reverse set |76543210|. Digits above 10000 are not handled yet. When
% the key contains the subkey |.F.|, the number after is treated as an
% special case, for a fixed form (see |babel-he.ini|, for example).
%
%    \begin{macrocode}
\newcommand\localenumeral[2]{\bbl@cs{cntr@#1@\languagename}{#2}}
\def\bbl@localecntr#1#2{\localenumeral{#2}{#1}}
\newcommand\localecounter[2]{%
  \expandafter\bbl@localecntr
  \expandafter{\number\csname c@#2\endcsname}{#1}}
\def\bbl@alphnumeral#1#2{%
  \expandafter\bbl@alphnumeral@i\number#2 76543210\@@{#1}}
\def\bbl@alphnumeral@i#1#2#3#4#5#6#7#8\@@#9{%
  \ifcase\@car#8\@nil\or   % Currenty <10000, but prepared for bigger
    \bbl@alphnumeral@ii{#9}000000#1\or
    \bbl@alphnumeral@ii{#9}00000#1#2\or
    \bbl@alphnumeral@ii{#9}0000#1#2#3\or
    \bbl@alphnumeral@ii{#9}000#1#2#3#4\else
    \bbl@alphnum@invalid{>9999}%
  \fi}
\def\bbl@alphnumeral@ii#1#2#3#4#5#6#7#8{%
  \bbl@ifunset{bbl@cntr@#1.F.\number#5#6#7#8@\languagename}%
    {\bbl@cs{cntr@#1.4@\languagename}#5%
     \bbl@cs{cntr@#1.3@\languagename}#6%
     \bbl@cs{cntr@#1.2@\languagename}#7%
     \bbl@cs{cntr@#1.1@\languagename}#8%
     \ifnum#6#7#8>\z@ % TODO. An ad hoc rule for Greek. Ugly.
       \bbl@ifunset{bbl@cntr@#1.S.321@\languagename}{}%
         {\bbl@cs{cntr@#1.S.321@\languagename}}%
     \fi}%
    {\bbl@cs{cntr@#1.F.\number#5#6#7#8@\languagename}}}
\def\bbl@alphnum@invalid#1{%
  \bbl@error{Alphabetic numeral too large (#1)}%
    {Currently this is the limit.}}
%    \end{macrocode}
%
% The information in the identification section can be useful, so the
% following macro just exposes it with a user command.
%
%    \begin{macrocode}
\newcommand\localeinfo[1]{%
  \bbl@ifunset{bbl@\csname bbl@info@#1\endcsname @\languagename}%
    {\bbl@error{I've found no info for the current locale.\\%
                The corresponding ini file has not been loaded\\%
                Perhaps it doesn't exist}%
               {See the manual for details.}}%
    {\bbl@cs{\csname bbl@info@#1\endcsname @\languagename}}}
% \@namedef{bbl@info@name.locale}{lcname}
\@namedef{bbl@info@tag.ini}{lini}
\@namedef{bbl@info@name.english}{elname}
\@namedef{bbl@info@name.opentype}{lname}
\@namedef{bbl@info@tag.bcp47}{tbcp}
\@namedef{bbl@info@language.tag.bcp47}{lbcp}
\@namedef{bbl@info@tag.opentype}{lotf}
\@namedef{bbl@info@script.name}{esname}
\@namedef{bbl@info@script.name.opentype}{sname}
\@namedef{bbl@info@script.tag.bcp47}{sbcp} 
\@namedef{bbl@info@script.tag.opentype}{sotf} 
\let\bbl@ensureinfo\@gobble
\newcommand\BabelEnsureInfo{%
  \ifx\InputIfFileExists\@undefined\else
    \def\bbl@ensureinfo##1{%
      \bbl@ifunset{bbl@lname@##1}{\bbl@load@info{##1}}{}}%
  \fi
  \bbl@foreach\bbl@loaded{{%
    \def\languagename{##1}%
    \bbl@ensureinfo{##1}}}}
%    \end{macrocode}
%
% More general, but non-expandable, is |\getlocaleproperty|. To inspect
% every possible loaded |ini|, we define |\LocaleForEach|, where
% |\bbl@ini@loaded| is a comma-separated list of locales, built by
% |\bbl@read@ini|. 
%
%    \begin{macrocode}   
\newcommand\getlocaleproperty{%
  \@ifstar\bbl@getproperty@s\bbl@getproperty@x}
\def\bbl@getproperty@s#1#2#3{%
  \let#1\relax
  \def\bbl@elt##1##2##3{%
    \bbl@ifsamestring{##1/##2}{#3}%
      {\providecommand#1{##3}%
       \def\bbl@elt####1####2####3{}}%
      {}}%
  \bbl@cs{inidata@#2}}%
\def\bbl@getproperty@x#1#2#3{%
  \bbl@getproperty@s{#1}{#2}{#3}%
  \ifx#1\relax
    \bbl@error
      {Unknown key for locale '#2':\\%
       #3\\%
       \string#1 will be set to \relax}%
      {Perhaps you misspelled it.}%
  \fi}
\let\bbl@ini@loaded\@empty
\newcommand\LocaleForEach{\bbl@foreach\bbl@ini@loaded}
%    \end{macrocode}
%
% \section{Adjusting the Babel bahavior}
%
% A generic high level inteface is provided to adjust some global
% and general settings.
%
%    \begin{macrocode}
\newcommand\babeladjust[1]{%  TODO. Error handling.
  \bbl@forkv{#1}{%
    \bbl@ifunset{bbl@ADJ@##1@##2}% 
      {\bbl@cs{ADJ@##1}{##2}}%
      {\bbl@cs{ADJ@##1@##2}}}}
%
\def\bbl@adjust@lua#1#2{%
  \ifvmode
    \ifnum\currentgrouplevel=\z@
      \directlua{ Babel.#2 }%
      \expandafter\expandafter\expandafter\@gobble
    \fi
  \fi      
  {\bbl@error   % The error is gobbled if everything went ok.
     {Currently, #1 related features can be adjusted only\\%
      in the main vertical list.}%
     {Maybe things change in the future, but this is what it is.}}}
\@namedef{bbl@ADJ@bidi.mirroring@on}{%
  \bbl@adjust@lua{bidi}{mirroring_enabled=true}}
\@namedef{bbl@ADJ@bidi.mirroring@off}{%
  \bbl@adjust@lua{bidi}{mirroring_enabled=false}}
\@namedef{bbl@ADJ@bidi.text@on}{%
  \bbl@adjust@lua{bidi}{bidi_enabled=true}}
\@namedef{bbl@ADJ@bidi.text@off}{%
  \bbl@adjust@lua{bidi}{bidi_enabled=false}}
\@namedef{bbl@ADJ@bidi.mapdigits@on}{%
  \bbl@adjust@lua{bidi}{digits_mapped=true}}
\@namedef{bbl@ADJ@bidi.mapdigits@off}{%
  \bbl@adjust@lua{bidi}{digits_mapped=false}}
%
\@namedef{bbl@ADJ@linebreak.sea@on}{%
  \bbl@adjust@lua{linebreak}{sea_enabled=true}}
\@namedef{bbl@ADJ@linebreak.sea@off}{%
  \bbl@adjust@lua{linebreak}{sea_enabled=false}}
\@namedef{bbl@ADJ@linebreak.cjk@on}{%
  \bbl@adjust@lua{linebreak}{cjk_enabled=true}}
\@namedef{bbl@ADJ@linebreak.cjk@off}{%
  \bbl@adjust@lua{linebreak}{cjk_enabled=false}}
\@namedef{bbl@ADJ@justify.arabic@on}{%
  \bbl@adjust@lua{linebreak}{arabic.justify_enabled=true}}
\@namedef{bbl@ADJ@justify.arabic@off}{%
  \bbl@adjust@lua{linebreak}{arabic.justify_enabled=false}}
%
\def\bbl@adjust@layout#1{%
  \ifvmode
    #1%
    \expandafter\@gobble
  \fi
  {\bbl@error   % The error is gobbled if everything went ok.
     {Currently, layout related features can be adjusted only\\%
      in vertical mode.}%
     {Maybe things change in the future, but this is what it is.}}}
\@namedef{bbl@ADJ@layout.tabular@on}{%
  \bbl@adjust@layout{\let\@tabular\bbl@NL@@tabular}}
\@namedef{bbl@ADJ@layout.tabular@off}{%
  \bbl@adjust@layout{\let\@tabular\bbl@OL@@tabular}}
\@namedef{bbl@ADJ@layout.lists@on}{%
  \bbl@adjust@layout{\let\list\bbl@NL@list}}
\@namedef{bbl@ADJ@layout.lists@off}{%
  \bbl@adjust@layout{\let\list\bbl@OL@list}}
\@namedef{bbl@ADJ@hyphenation.extra@on}{%
  \bbl@activateposthyphen}
%
\@namedef{bbl@ADJ@autoload.bcp47@on}{%
  \bbl@bcpallowedtrue}
\@namedef{bbl@ADJ@autoload.bcp47@off}{%
  \bbl@bcpallowedfalse}
\@namedef{bbl@ADJ@autoload.bcp47.prefix}#1{%
  \def\bbl@bcp@prefix{#1}}
\def\bbl@bcp@prefix{bcp47-}
\@namedef{bbl@ADJ@autoload.options}#1{%
  \def\bbl@autoload@options{#1}}
\let\bbl@autoload@bcpoptions\@empty
\@namedef{bbl@ADJ@autoload.bcp47.options}#1{%
  \def\bbl@autoload@bcpoptions{#1}}
\newif\ifbbl@bcptoname
\@namedef{bbl@ADJ@bcp47.toname@on}{%
  \bbl@bcptonametrue
  \BabelEnsureInfo}
\@namedef{bbl@ADJ@bcp47.toname@off}{%
  \bbl@bcptonamefalse}
\@namedef{bbl@ADJ@prehyphenation.disable@nohyphenation}{%
  \directlua{ Babel.ignore_pre_char = function(node)
      return (node.lang == \the\csname l@nohyphenation\endcsname)
    end }}
\@namedef{bbl@ADJ@prehyphenation.disable@off}{%
  \directlua{ Babel.ignore_pre_char = function(node)
      return false
    end }}
% TODO: use babel name, override 
%
% As the final task, load the code for lua.
%
\ifx\directlua\@undefined\else
  \ifx\bbl@luapatterns\@undefined
    \input luababel.def
  \fi
\fi
%</core>
%    \end{macrocode}
%
% A proxy file for switch.def
%
%    \begin{macrocode}
%<*kernel>
\let\bbl@onlyswitch\@empty
\input babel.def
\let\bbl@onlyswitch\@undefined
%</kernel>
%<*patterns>
%    \end{macrocode}
%
%  \end{macro}
%  \end{macro}
%  \end{macro}
%
% \section{Loading hyphenation patterns}
%
% The following code is meant to be read by ini\TeX\ because it
% should instruct \TeX\ to read hyphenation patterns. To this end the
% \texttt{docstrip} option \texttt{patterns} can be used to include
% this code in the file \file{hyphen.cfg}. Code is written with lower
% level macros.
%
% To make sure that \LaTeX$\:$2.09 executes the |\@begindocumenthook|
% we would want to alter |\begin{document}|, but as this done too often
% already, we add the new code at the front of |\@preamblecmds|. But we
% can only do that after it has been defined, so we add this piece of
% code to |\dump|.
%
% This new definition starts by adding an instruction to write a
% message on the terminal and in the transcript file to inform the
% user of the preloaded hyphenation patterns.
%
% Then everything is restored to the old situation and the format
% is dumped.
%
%    \begin{macrocode}
<@Make sure ProvidesFile is defined@>
\ProvidesFile{hyphen.cfg}[<@date@> <@version@> Babel hyphens]
\xdef\bbl@format{\jobname}
\def\bbl@version{<@version@>}
\def\bbl@date{<@date@>}
\ifx\AtBeginDocument\@undefined
  \def\@empty{}
  \let\orig@dump\dump
  \def\dump{%
    \ifx\@ztryfc\@undefined
    \else
      \toks0=\expandafter{\@preamblecmds}%
      \edef\@preamblecmds{\noexpand\@begindocumenthook\the\toks0}%
      \def\@begindocumenthook{}%
    \fi
    \let\dump\orig@dump\let\orig@dump\@undefined\dump}
\fi
<@Define core switching macros@>
%    \end{macrocode}
%
%  \begin{macro}{\process@line}
%    Each line in the file \file{language.dat} is processed by
%    |\process@line| after it is read. The first thing this macro does
%    is to check whether the line starts with \texttt{=}.
%    When the first token of a line is an \texttt{=}, the macro
%    |\process@synonym| is called; otherwise the macro
%    |\process@language| will continue.
%
%    \begin{macrocode}
\def\process@line#1#2 #3 #4 {%
  \ifx=#1%
    \process@synonym{#2}%
  \else
    \process@language{#1#2}{#3}{#4}%
  \fi
  \ignorespaces}
%    \end{macrocode}
%
%  \end{macro}
%
%  \begin{macro}{\process@synonym}
%
% This macro takes care of the lines which start with an
% \texttt{=}. It needs an empty token register to begin with.
% |\bbl@languages| is also set to empty.
%
%    \begin{macrocode}
\toks@{}
\def\bbl@languages{}
%    \end{macrocode}
%
% When no languages have been loaded yet, the name following the
% \texttt{=} will be a synonym for hyphenation register 0. So, it is
% stored in a token register and executed when the first pattern file
% has been processed. (The |\relax| just helps to the |\if| below
% catching synonyms without a language.)
%
% Otherwise the name will be a synonym for the language loaded last.
%
% We also need to copy the hyphenmin parameters for the synonym.
%
%    \begin{macrocode}
\def\process@synonym#1{%
  \ifnum\last@language=\m@ne
    \toks@\expandafter{\the\toks@\relax\process@synonym{#1}}%
  \else
    \expandafter\chardef\csname l@#1\endcsname\last@language
    \wlog{\string\l@#1=\string\language\the\last@language}%
    \expandafter\let\csname #1hyphenmins\expandafter\endcsname
      \csname\languagename hyphenmins\endcsname
    \let\bbl@elt\relax
    \edef\bbl@languages{\bbl@languages\bbl@elt{#1}{\the\last@language}{}{}}%
  \fi}
%    \end{macrocode}
%
%  \end{macro}
%
% \begin{macro}{\process@language}
%
% The macro |\process@language| is used to process a non-empty line
% from the `configuration file'. It has three arguments, each
% delimited by white space. The first argument is the `name' of a
% language; the second is the name of the file that contains the
% patterns. The optional third argument is the name of a file
% containing hyphenation exceptions.
%
% The first thing to do is call |\addlanguage| to allocate a pattern
% register and to make that register `active'. Then the pattern file
% is read.
%
% For some hyphenation patterns it is needed to load them with a
% specific font encoding selected. This can be specified in the
% file \file{language.dat} by adding for instance `\texttt{:T1}' to
% the name of the language. The macro |\bbl@get@enc| extracts the
% font encoding from the language name and stores it in
% |\bbl@hyph@enc|. The latter can be used in hyphenation files if
% you need to set a behavior depending on the given encoding (it
% is set to empty if no encoding is given).
%
% Pattern files may contain assignments to |\lefthyphenmin| and
% |\righthyphenmin|. \TeX\ does not keep track of these
% assignments. Therefore we try to detect such assignments and
% store them in the |\|\langvar|hyphenmins| macro. When no
% assignments were made we provide a default setting.
%
% Some pattern files contain changes to the |\lccode| en |\uccode|
% arrays. Such changes should remain local to the language;
% therefore we process the pattern file in a group; the |\patterns|
% command acts globally so its effect will be remembered.
%
% Then we globally store the settings of |\lefthyphenmin| and
% |\righthyphenmin| and close the group.
%
% When the hyphenation patterns have been processed we need to see
% if a file with hyphenation exceptions needs to be read. This is
% the case when the third argument is not empty and when it does
% not contain a space token. (Note however there is no need to save
% hyphenation exceptions into the format.)
%
% \cs{bbl@languages} saves a snapshot of the loaded languages in the
% form  \cs{bbl@elt}\marg{language-name}\marg{number}%
% \marg{patterns-file}\marg{exceptions-file}. Note the last 2
% arguments are empty in `dialects' defined in |language.dat| with
% |=|. Note also the language name can have encoding info.
%
% Finally, if the counter |\language| is equal to zero we execute the
% synonyms stored.
%
%    \begin{macrocode}
\def\process@language#1#2#3{%
  \expandafter\addlanguage\csname l@#1\endcsname
  \expandafter\language\csname l@#1\endcsname
  \edef\languagename{#1}%
  \bbl@hook@everylanguage{#1}%
  %  > luatex
  \bbl@get@enc#1::\@@@
  \begingroup
    \lefthyphenmin\m@ne
    \bbl@hook@loadpatterns{#2}%
    %  > luatex
    \ifnum\lefthyphenmin=\m@ne
    \else
      \expandafter\xdef\csname #1hyphenmins\endcsname{%
        \the\lefthyphenmin\the\righthyphenmin}%
    \fi
  \endgroup
  \def\bbl@tempa{#3}%
  \ifx\bbl@tempa\@empty\else
    \bbl@hook@loadexceptions{#3}%
    %  > luatex
  \fi
  \let\bbl@elt\relax
  \edef\bbl@languages{%
    \bbl@languages\bbl@elt{#1}{\the\language}{#2}{\bbl@tempa}}%
  \ifnum\the\language=\z@
    \expandafter\ifx\csname #1hyphenmins\endcsname\relax
      \set@hyphenmins\tw@\thr@@\relax
    \else
      \expandafter\expandafter\expandafter\set@hyphenmins
        \csname #1hyphenmins\endcsname
    \fi
    \the\toks@
    \toks@{}%
  \fi}
%    \end{macrocode}
%
% \begin{macro}{\bbl@get@enc}
%
% \begin{macro}{\bbl@hyph@enc}
% The macro |\bbl@get@enc| extracts the font encoding from the
% language name and stores it in |\bbl@hyph@enc|. It uses delimited
% arguments to achieve this.
%
%    \begin{macrocode}
\def\bbl@get@enc#1:#2:#3\@@@{\def\bbl@hyph@enc{#2}}
%    \end{macrocode}
%
% \end{macro}
% \end{macro}
% \end{macro}
%
% Now, hooks are defined. For efficiency reasons, they are dealt
% here in a special way. Besides \luatex, format-specific
% configuration files are taken into account. |loadkernel| currently
% loads nothing, but define some basic macros instead.
%
%    \begin{macrocode}
\def\bbl@hook@everylanguage#1{}
\def\bbl@hook@loadpatterns#1{\input #1\relax}
\let\bbl@hook@loadexceptions\bbl@hook@loadpatterns
\def\bbl@hook@loadkernel#1{%
  \def\addlanguage{\csname newlanguage\endcsname}%
  \def\adddialect##1##2{%
    \global\chardef##1##2\relax
    \wlog{\string##1 = a dialect from \string\language##2}}%
  \def\iflanguage##1{%
    \expandafter\ifx\csname l@##1\endcsname\relax
      \@nolanerr{##1}%
    \else
      \ifnum\csname l@##1\endcsname=\language
        \expandafter\expandafter\expandafter\@firstoftwo
      \else
        \expandafter\expandafter\expandafter\@secondoftwo
      \fi
    \fi}%
  \def\providehyphenmins##1##2{%
    \expandafter\ifx\csname ##1hyphenmins\endcsname\relax
      \@namedef{##1hyphenmins}{##2}%
    \fi}%
  \def\set@hyphenmins##1##2{%
    \lefthyphenmin##1\relax
    \righthyphenmin##2\relax}%
  \def\selectlanguage{%
    \errhelp{Selecting a language requires a package supporting it}%
    \errmessage{Not loaded}}%
  \let\foreignlanguage\selectlanguage
  \let\otherlanguage\selectlanguage
  \expandafter\let\csname otherlanguage*\endcsname\selectlanguage
  \def\bbl@usehooks##1##2{}% TODO. Temporary!!
  \def\setlocale{%
    \errhelp{Find an armchair, sit down and wait}%
    \errmessage{Not yet available}}%
  \let\uselocale\setlocale
  \let\locale\setlocale
  \let\selectlocale\setlocale
  \let\localename\setlocale
  \let\textlocale\setlocale
  \let\textlanguage\setlocale
  \let\languagetext\setlocale}
\begingroup
  \def\AddBabelHook#1#2{%
    \expandafter\ifx\csname bbl@hook@#2\endcsname\relax
      \def\next{\toks1}%
    \else
      \def\next{\expandafter\gdef\csname bbl@hook@#2\endcsname####1}%
    \fi
    \next}
  \ifx\directlua\@undefined
    \ifx\XeTeXinputencoding\@undefined\else
      \input xebabel.def
    \fi
  \else
    \input luababel.def
  \fi
  \openin1 = babel-\bbl@format.cfg
  \ifeof1
  \else
    \input babel-\bbl@format.cfg\relax
  \fi
  \closein1
\endgroup
\bbl@hook@loadkernel{switch.def}
%    \end{macrocode}
%
%  \begin{macro}{\readconfigfile}
%    The configuration file can now be opened for reading.
%
%    \begin{macrocode}
\openin1 = language.dat
%    \end{macrocode}
%
%    See if the file exists, if not, use the default hyphenation file
%    \file{hyphen.tex}. The user will be informed about this.
%
%    \begin{macrocode}
\def\languagename{english}%
\ifeof1
  \message{I couldn't find the file language.dat,\space
           I will try the file hyphen.tex}
  \input hyphen.tex\relax
  \chardef\l@english\z@
\else
%    \end{macrocode}
%
% Pattern registers are allocated using count register
% |\last@language|. Its initial value is~0. The definition of the
% macro |\newlanguage| is such that it first increments the count
% register and then defines the language. In order to have the
% first patterns loaded in pattern register number~0 we initialize
% |\last@language| with the value~$-1$.
%
%    \begin{macrocode}
  \last@language\m@ne
%    \end{macrocode}
%
% We now read lines from the file until the end is found. While
% reading from the input, it is useful to switch off recognition of
% the end-of-line character. This saves us stripping off spaces from
% the contents of the control sequence.
%
%    \begin{macrocode}
  \loop
    \endlinechar\m@ne
    \read1 to \bbl@line
    \endlinechar`\^^M
%    \end{macrocode}
%
%    If the file has reached its end, exit from the loop here. If not,
%    empty lines are skipped. Add 3 space characters to the end of
%    |\bbl@line|. This is needed to be able to recognize the arguments
%    of |\process@line| later on. The default language should be the
%    very first one.
%
%    \begin{macrocode}
    \if T\ifeof1F\fi T\relax
      \ifx\bbl@line\@empty\else
        \edef\bbl@line{\bbl@line\space\space\space}%
        \expandafter\process@line\bbl@line\relax
      \fi
  \repeat
%    \end{macrocode}
%
% Check for the end of the file. We must reverse the test for
% |\ifeof| without |\else|. Then reactivate the default patterns,
% and close the configuration file.
%
%    \begin{macrocode}
  \begingroup
    \def\bbl@elt#1#2#3#4{%
      \global\language=#2\relax
      \gdef\languagename{#1}%
      \def\bbl@elt##1##2##3##4{}}%
    \bbl@languages
  \endgroup
\fi
\closein1
%    \end{macrocode}
%
% We add a message about the fact that babel is loaded in the
% format and with which language patterns to the \cs{everyjob}
% register.
%
%    \begin{macrocode}
\if/\the\toks@/\else
  \errhelp{language.dat loads no language, only synonyms}
  \errmessage{Orphan language synonym}
\fi
%    \end{macrocode}
%
%    Also remove some macros from memory and raise an error
%    if |\toks@| is not empty. Finally load \file{switch.def}, but the
%    latter is not required and the line inputting it may be commented
%    out.
%
%    \begin{macrocode}
\let\bbl@line\@undefined
\let\process@line\@undefined
\let\process@synonym\@undefined
\let\process@language\@undefined
\let\bbl@get@enc\@undefined
\let\bbl@hyph@enc\@undefined
\let\bbl@tempa\@undefined
\let\bbl@hook@loadkernel\@undefined
\let\bbl@hook@everylanguage\@undefined
\let\bbl@hook@loadpatterns\@undefined
\let\bbl@hook@loadexceptions\@undefined
%</patterns>
%    \end{macrocode}
%
%    Here the code for ini\TeX\ ends.
%  \end{macro}
%
% \section{Font handling with fontspec}
%
% Add the bidi handler just before luaoftload, which is loaded by default
% by LaTeX. Just in case, consider the possibility it has not been
% loaded. First, a couple of definitions related to bidi [misplaced].
%
%    \begin{macrocode}
%<<*More package options>>
\chardef\bbl@bidimode\z@
\DeclareOption{bidi=default}{\chardef\bbl@bidimode=\@ne}
\DeclareOption{bidi=basic}{\chardef\bbl@bidimode=101 }
\DeclareOption{bidi=basic-r}{\chardef\bbl@bidimode=102 }
\DeclareOption{bidi=bidi}{\chardef\bbl@bidimode=201 }
\DeclareOption{bidi=bidi-r}{\chardef\bbl@bidimode=202 }
\DeclareOption{bidi=bidi-l}{\chardef\bbl@bidimode=203 }
%<</More package options>>
%    \end{macrocode}
%
% With explicit languages, we could define the font at once, but we
% don't. Just wait and see if the language is actually activated.
% |bbl@font| replaces hardcoded font names inside |\..family| by the
% corresponding macro |\..default|.
%
% At the time of this writing, \textsf{fontspec} shows a warning about
% there are languages not available, which some people think refers to
% \babel{}, even if there is nothing wrong. Here is hack to patch
% \textsf{fontspec} to avoid the misleading message, which is replaced
% ba a more explanatory one.
%
%    \begin{macrocode}
%<<*Font selection>>
\bbl@trace{Font handling with fontspec}
\ifx\ExplSyntaxOn\@undefined\else
  \ExplSyntaxOn
  \catcode`\ =10
  \def\bbl@loadfontspec{%
    \usepackage{fontspec}%
    \expandafter
    \def\csname msg~text~>~fontspec/language-not-exist\endcsname##1##2##3##4{%
      Font '\l_fontspec_fontname_tl' is using the\\%
      default features for language '##1'.\\%
      That's usually fine, because many languages\\%
      require no specific features, but if the output is\\%
      not as expected, consider selecting another font.}
    \expandafter
    \def\csname msg~text~>~fontspec/no-script\endcsname##1##2##3##4{%
      Font '\l_fontspec_fontname_tl' is using the\\%
      default features for script '##2'.\\%
      That's not always wrong, but if the output is\\%
      not as expected, consider selecting another font.}}
  \ExplSyntaxOff
\fi
\@onlypreamble\babelfont
\newcommand\babelfont[2][]{%  1=langs/scripts 2=fam
  \bbl@foreach{#1}{%
    \expandafter\ifx\csname date##1\endcsname\relax
      \IfFileExists{babel-##1.tex}%
        {\babelprovide{##1}}%
        {}%
    \fi}%
  \edef\bbl@tempa{#1}%
  \def\bbl@tempb{#2}%  Used by \bbl@bblfont
  \ifx\fontspec\@undefined
    \bbl@loadfontspec
  \fi
  \EnableBabelHook{babel-fontspec}% Just calls \bbl@switchfont
  \bbl@bblfont}
\newcommand\bbl@bblfont[2][]{% 1=features 2=fontname, @font=rm|sf|tt
  \bbl@ifunset{\bbl@tempb family}%
    {\bbl@providefam{\bbl@tempb}}%
    {\bbl@exp{%
      \\\bbl@sreplace\<\bbl@tempb family >%
        {\@nameuse{\bbl@tempb default}}{\<\bbl@tempb default>}}}%
  % For the default font, just in case:
  \bbl@ifunset{bbl@lsys@\languagename}{\bbl@provide@lsys{\languagename}}{}%
  \expandafter\bbl@ifblank\expandafter{\bbl@tempa}%
    {\bbl@csarg\edef{\bbl@tempb dflt@}{<>{#1}{#2}}% save bbl@rmdflt@
     \bbl@exp{%
       \let\<bbl@\bbl@tempb dflt@\languagename>\<bbl@\bbl@tempb dflt@>%
       \\\bbl@font@set\<bbl@\bbl@tempb dflt@\languagename>%
                      \<\bbl@tempb default>\<\bbl@tempb family>}}%
    {\bbl@foreach\bbl@tempa{% ie bbl@rmdflt@lang / *scrt
       \bbl@csarg\def{\bbl@tempb dflt@##1}{<>{#1}{#2}}}}}%
%    \end{macrocode}
%
% If the family in the previous command does not exist, it must be
% defined. Here is how:
%
%    \begin{macrocode}
\def\bbl@providefam#1{%
  \bbl@exp{%
    \\\newcommand\<#1default>{}% Just define it
    \\\bbl@add@list\\\bbl@font@fams{#1}%
    \\\DeclareRobustCommand\<#1family>{%
      \\\not@math@alphabet\<#1family>\relax
      \\\fontfamily\<#1default>\\\selectfont}%
    \\\DeclareTextFontCommand{\<text#1>}{\<#1family>}}}
%    \end{macrocode}
%
% The following macro is activated when the hook |babel-fontspec| is
% enabled. But before we define a macro for a warning, which sets a
% flag to avoid duplicate them.
%
%    \begin{macrocode}
\def\bbl@nostdfont#1{%
  \bbl@ifunset{bbl@WFF@\f@family}%
    {\bbl@csarg\gdef{WFF@\f@family}{}%  Flag, to avoid dupl warns
     \bbl@infowarn{The current font is not a babel standard family:\\%
       #1%
       \fontname\font\\%
       There is nothing intrinsically wrong with this warning, and\\%
       you can ignore it altogether if you do not need these\\%
       families. But if they are used in the document, you should be\\%
       aware 'babel' will no set Script and Language for them, so\\%
       you may consider defining a new family with \string\babelfont.\\%
       See the manual for further details about \string\babelfont.\\%
       Reported}}
   {}}%
\gdef\bbl@switchfont{%
  \bbl@ifunset{bbl@lsys@\languagename}{\bbl@provide@lsys{\languagename}}{}%
  \bbl@exp{%  eg Arabic -> arabic
    \lowercase{\edef\\\bbl@tempa{\bbl@cl{sname}}}}%
  \bbl@foreach\bbl@font@fams{%
    \bbl@ifunset{bbl@##1dflt@\languagename}%    (1) language?
      {\bbl@ifunset{bbl@##1dflt@*\bbl@tempa}%   (2) from script?
         {\bbl@ifunset{bbl@##1dflt@}%           2=F - (3) from generic?
           {}%                                  123=F - nothing!
           {\bbl@exp{%                          3=T - from generic
              \global\let\<bbl@##1dflt@\languagename>%
                         \<bbl@##1dflt@>}}}%
         {\bbl@exp{%                            2=T - from script
            \global\let\<bbl@##1dflt@\languagename>%
                       \<bbl@##1dflt@*\bbl@tempa>}}}%
      {}}%                               1=T - language, already defined
  \def\bbl@tempa{\bbl@nostdfont{}}%
  \bbl@foreach\bbl@font@fams{%     don't gather with prev for
    \bbl@ifunset{bbl@##1dflt@\languagename}%
      {\bbl@cs{famrst@##1}%
       \global\bbl@csarg\let{famrst@##1}\relax}%
      {\bbl@exp{% order is relevant. TODO: but sometimes wrong!
         \\\bbl@add\\\originalTeX{%
           \\\bbl@font@rst{\bbl@cl{##1dflt}}%
                          \<##1default>\<##1family>{##1}}%
         \\\bbl@font@set\<bbl@##1dflt@\languagename>% the main part!
                        \<##1default>\<##1family>}}}%
  \bbl@ifrestoring{}{\bbl@tempa}}%
%    \end{macrocode}
%
% The following is executed at the beginning of the aux file or the
% document to warn about fonts not defined with |\babelfont|.
%
%    \begin{macrocode}
\ifx\f@family\@undefined\else   % if latex
  \ifcase\bbl@engine            % if pdftex
    \let\bbl@ckeckstdfonts\relax
  \else
    \def\bbl@ckeckstdfonts{%
      \begingroup
        \global\let\bbl@ckeckstdfonts\relax
        \let\bbl@tempa\@empty
        \bbl@foreach\bbl@font@fams{%
          \bbl@ifunset{bbl@##1dflt@}%
            {\@nameuse{##1family}%
             \bbl@csarg\gdef{WFF@\f@family}{}% Flag
             \bbl@exp{\\\bbl@add\\\bbl@tempa{* \<##1family>= \f@family\\\\%
                \space\space\fontname\font\\\\}}%
             \bbl@csarg\xdef{##1dflt@}{\f@family}%
             \expandafter\xdef\csname ##1default\endcsname{\f@family}}%
            {}}%
        \ifx\bbl@tempa\@empty\else
          \bbl@infowarn{The following font families will use the default\\%
            settings for all or some languages:\\%
            \bbl@tempa
            There is nothing intrinsically wrong with it, but\\%
            'babel' will no set Script and Language, which could\\%
             be relevant in some languages. If your document uses\\%
             these families, consider redefining them with \string\babelfont.\\%
            Reported}%
        \fi
      \endgroup}
  \fi
\fi
%    \end{macrocode}
%
% Now the macros defining the font with \textsf{fontspec}.
%
% When there are repeated keys in \textsf{fontspec}, the last value
% wins. So, we just place the ini settings at the beginning, and user
% settings will take precedence. We must deactivate temporarily
% |\bbl@mapselect| because |\selectfont| is called internally when a
% font is defined.
%
%    \begin{macrocode}
\def\bbl@font@set#1#2#3{% eg \bbl@rmdflt@lang \rmdefault \rmfamily
  \bbl@xin@{<>}{#1}%
  \ifin@
    \bbl@exp{\\\bbl@fontspec@set\\#1\expandafter\@gobbletwo#1\\#3}%
  \fi
  \bbl@exp{%              'Unprotected' macros return prev values
    \def\\#2{#1}%         eg, \rmdefault{\bbl@rmdflt@lang}
    \\\bbl@ifsamestring{#2}{\f@family}%
      {\\#3%
       \\\bbl@ifsamestring{\f@series}{\bfdefault}{\\\bfseries}{}%
       \let\\\bbl@tempa\relax}%
      {}}}
%     TODO - next should be global?, but even local does its job. I'm
%     still not sure -- must investigate:
\def\bbl@fontspec@set#1#2#3#4{% eg \bbl@rmdflt@lang fnt-opt fnt-nme \xxfamily
  \let\bbl@tempe\bbl@mapselect
  \let\bbl@mapselect\relax
  \let\bbl@temp@fam#4%       eg, '\rmfamily', to be restored below
  \let#4\@empty      %       Make sure \renewfontfamily is valid
  \bbl@exp{%
    \let\\\bbl@temp@pfam\<\bbl@stripslash#4\space>% eg, '\rmfamily '
    \<keys_if_exist:nnF>{fontspec-opentype}{Script/\bbl@cl{sname}}%
      {\\\newfontscript{\bbl@cl{sname}}{\bbl@cl{sotf}}}%
    \<keys_if_exist:nnF>{fontspec-opentype}{Language/\bbl@cl{lname}}%
      {\\\newfontlanguage{\bbl@cl{lname}}{\bbl@cl{lotf}}}%
    \\\renewfontfamily\\#4%
      [\bbl@cs{lsys@\languagename},#2]}{#3}% ie \bbl@exp{..}{#3}
  \begingroup
     #4%
     \xdef#1{\f@family}%     eg, \bbl@rmdflt@lang{FreeSerif(0)}
  \endgroup
  \let#4\bbl@temp@fam
  \bbl@exp{\let\<\bbl@stripslash#4\space>}\bbl@temp@pfam
  \let\bbl@mapselect\bbl@tempe}%
%    \end{macrocode}
%
% font@rst and famrst are only used when there is no global settings,
% to save and restore de previous families. Not really necessary, but
% done for optimization.
%
%    \begin{macrocode}
\def\bbl@font@rst#1#2#3#4{%
  \bbl@csarg\def{famrst@#4}{\bbl@font@set{#1}#2#3}}
%    \end{macrocode}
%
% The default font families. They are eurocentric, but the list can be
% expanded easily with |\babelfont|.
%
%    \begin{macrocode}
\def\bbl@font@fams{rm,sf,tt}
%    \end{macrocode}
%
% The old tentative way. Short and preverved for compatibility, but
% deprecated. Note there is no direct alternative for
% |\babelFSfeatures|. The reason in explained in the user guide, but
% essentially -- that was not the way to go :-).
%
%    \begin{macrocode}
\newcommand\babelFSstore[2][]{%
  \bbl@ifblank{#1}%
    {\bbl@csarg\def{sname@#2}{Latin}}%
    {\bbl@csarg\def{sname@#2}{#1}}%
  \bbl@provide@dirs{#2}%
  \bbl@csarg\ifnum{wdir@#2}>\z@
    \let\bbl@beforeforeign\leavevmode
    \EnableBabelHook{babel-bidi}%
  \fi
  \bbl@foreach{#2}{%
    \bbl@FSstore{##1}{rm}\rmdefault\bbl@save@rmdefault
    \bbl@FSstore{##1}{sf}\sfdefault\bbl@save@sfdefault
    \bbl@FSstore{##1}{tt}\ttdefault\bbl@save@ttdefault}}
\def\bbl@FSstore#1#2#3#4{%
  \bbl@csarg\edef{#2default#1}{#3}%
  \expandafter\addto\csname extras#1\endcsname{%
    \let#4#3%
    \ifx#3\f@family
      \edef#3{\csname bbl@#2default#1\endcsname}%
      \fontfamily{#3}\selectfont
    \else
      \edef#3{\csname bbl@#2default#1\endcsname}%
    \fi}%
  \expandafter\addto\csname noextras#1\endcsname{%
    \ifx#3\f@family
      \fontfamily{#4}\selectfont
    \fi
    \let#3#4}}
\let\bbl@langfeatures\@empty
\def\babelFSfeatures{% make sure \fontspec is redefined once
  \let\bbl@ori@fontspec\fontspec
  \renewcommand\fontspec[1][]{%
    \bbl@ori@fontspec[\bbl@langfeatures##1]}
  \let\babelFSfeatures\bbl@FSfeatures
  \babelFSfeatures}
\def\bbl@FSfeatures#1#2{%
  \expandafter\addto\csname extras#1\endcsname{%
    \babel@save\bbl@langfeatures
    \edef\bbl@langfeatures{#2,}}}
%<</Font selection>>
%    \end{macrocode}
%
% \section{Hooks for XeTeX and LuaTeX}
%
% \subsection{XeTeX}
%
%    Unfortunately, the current encoding cannot be retrieved and
%    therefore it is reset always to |utf8|, which seems a sensible
%    default.
%
%    \begin{macrocode}
%<<*Footnote changes>>
\bbl@trace{Bidi footnotes}
\ifnum\bbl@bidimode>\z@
  \def\bbl@footnote#1#2#3{%
    \@ifnextchar[%
      {\bbl@footnote@o{#1}{#2}{#3}}%
      {\bbl@footnote@x{#1}{#2}{#3}}}
  \long\def\bbl@footnote@x#1#2#3#4{%
    \bgroup
      \select@language@x{\bbl@main@language}%
      \bbl@fn@footnote{#2#1{\ignorespaces#4}#3}%
    \egroup}
  \long\def\bbl@footnote@o#1#2#3[#4]#5{%
    \bgroup
      \select@language@x{\bbl@main@language}%
      \bbl@fn@footnote[#4]{#2#1{\ignorespaces#5}#3}%
    \egroup}
  \def\bbl@footnotetext#1#2#3{%
    \@ifnextchar[%
      {\bbl@footnotetext@o{#1}{#2}{#3}}%
      {\bbl@footnotetext@x{#1}{#2}{#3}}}
  \long\def\bbl@footnotetext@x#1#2#3#4{%
    \bgroup
      \select@language@x{\bbl@main@language}%
      \bbl@fn@footnotetext{#2#1{\ignorespaces#4}#3}%
    \egroup}
  \long\def\bbl@footnotetext@o#1#2#3[#4]#5{%
    \bgroup
      \select@language@x{\bbl@main@language}%
      \bbl@fn@footnotetext[#4]{#2#1{\ignorespaces#5}#3}%
    \egroup}
  \def\BabelFootnote#1#2#3#4{%
    \ifx\bbl@fn@footnote\@undefined
      \let\bbl@fn@footnote\footnote
    \fi
    \ifx\bbl@fn@footnotetext\@undefined
      \let\bbl@fn@footnotetext\footnotetext
    \fi
    \bbl@ifblank{#2}%
      {\def#1{\bbl@footnote{\@firstofone}{#3}{#4}}
       \@namedef{\bbl@stripslash#1text}%
         {\bbl@footnotetext{\@firstofone}{#3}{#4}}}%
      {\def#1{\bbl@exp{\\\bbl@footnote{\\\foreignlanguage{#2}}}{#3}{#4}}%
       \@namedef{\bbl@stripslash#1text}%
         {\bbl@exp{\\\bbl@footnotetext{\\\foreignlanguage{#2}}}{#3}{#4}}}}
\fi
%<</Footnote changes>>
%    \end{macrocode}
%
% Now, the code.
%
%    \begin{macrocode}
%<*xetex>
\def\BabelStringsDefault{unicode}
\let\xebbl@stop\relax
\AddBabelHook{xetex}{encodedcommands}{%
  \def\bbl@tempa{#1}%
  \ifx\bbl@tempa\@empty
    \XeTeXinputencoding"bytes"%
  \else
    \XeTeXinputencoding"#1"%
  \fi
  \def\xebbl@stop{\XeTeXinputencoding"utf8"}}
\AddBabelHook{xetex}{stopcommands}{%
  \xebbl@stop
  \let\xebbl@stop\relax}
\def\bbl@intraspace#1 #2 #3\@@{%
  \bbl@csarg\gdef{xeisp@\languagename}%
    {\XeTeXlinebreakskip #1em plus #2em minus #3em\relax}}
\def\bbl@intrapenalty#1\@@{%
  \bbl@csarg\gdef{xeipn@\languagename}%
    {\XeTeXlinebreakpenalty #1\relax}}
\def\bbl@provide@intraspace{%
  \bbl@xin@{/s}{/\bbl@cl{lnbrk}}%
  \ifin@\else\bbl@xin@{/c}{/\bbl@cl{lnbrk}}\fi
  \ifin@
    \bbl@ifunset{bbl@intsp@\languagename}{}%
      {\expandafter\ifx\csname bbl@intsp@\languagename\endcsname\@empty\else
        \ifx\bbl@KVP@intraspace\@nil
           \bbl@exp{%
             \\\bbl@intraspace\bbl@cl{intsp}\\\@@}%
        \fi
        \ifx\bbl@KVP@intrapenalty\@nil
          \bbl@intrapenalty0\@@
        \fi
      \fi
      \ifx\bbl@KVP@intraspace\@nil\else % We may override the ini
        \expandafter\bbl@intraspace\bbl@KVP@intraspace\@@
      \fi
      \ifx\bbl@KVP@intrapenalty\@nil\else
        \expandafter\bbl@intrapenalty\bbl@KVP@intrapenalty\@@
      \fi
      \bbl@exp{%
        % TODO. Execute only once (but redundant):
        \\\bbl@add\<extras\languagename>{%
          \XeTeXlinebreaklocale "\bbl@cl{tbcp}"%
          \<bbl@xeisp@\languagename>%
          \<bbl@xeipn@\languagename>}%
        \\\bbl@toglobal\<extras\languagename>%
        \\\bbl@add\<noextras\languagename>{%
          \XeTeXlinebreaklocale "en"}%
        \\\bbl@toglobal\<noextras\languagename>}%
      \ifx\bbl@ispacesize\@undefined
        \gdef\bbl@ispacesize{\bbl@cl{xeisp}}%
        \ifx\AtBeginDocument\@notprerr
          \expandafter\@secondoftwo  % to execute right now
        \fi
        \AtBeginDocument{%
          \expandafter\bbl@add
          \csname selectfont \endcsname{\bbl@ispacesize}%
          \expandafter\bbl@toglobal\csname selectfont \endcsname}%
      \fi}%
  \fi}
\ifx\DisableBabelHook\@undefined\endinput\fi
\AddBabelHook{babel-fontspec}{afterextras}{\bbl@switchfont}
\AddBabelHook{babel-fontspec}{beforestart}{\bbl@ckeckstdfonts}
\DisableBabelHook{babel-fontspec}
<@Font selection@>
\input txtbabel.def
%</xetex>
%    \end{macrocode}
%
% \subsection{Layout}
%
% \textit{In progress.}
%
% Note elements like headlines and margins can be modified easily with
% packages like \textsf{fancyhdr}, \textsf{typearea} or
% \textsf{titleps}, and \textsf{geometry}.
%
% |\bbl@startskip| and |\bbl@endskip| are available to package
% authors. Thanks to the \TeX{} expansion mechanism the following
% constructs are valid: |\adim\bbl@startskip|,
% |\advance\bbl@startskip\adim|, |\bbl@startskip\adim|.
%
% Consider |txtbabel| as a shorthand for \textit{tex--xet babel},
% which is the bidi model in both \pdftex{} and \xetex{}.
%
%    \begin{macrocode}
%<*texxet>
\providecommand\bbl@provide@intraspace{}
\bbl@trace{Redefinitions for bidi layout}
\def\bbl@sspre@caption{%
  \bbl@exp{\everyhbox{\\\bbl@textdir\bbl@cs{wdir@\bbl@main@language}}}}
\ifx\bbl@opt@layout\@nnil\endinput\fi  % No layout
\def\bbl@startskip{\ifcase\bbl@thepardir\leftskip\else\rightskip\fi}
\def\bbl@endskip{\ifcase\bbl@thepardir\rightskip\else\leftskip\fi}
\ifx\bbl@beforeforeign\leavevmode % A poor test for bidi=
  \def\@hangfrom#1{%
    \setbox\@tempboxa\hbox{{#1}}%
    \hangindent\ifcase\bbl@thepardir\wd\@tempboxa\else-\wd\@tempboxa\fi
    \noindent\box\@tempboxa}
  \def\raggedright{%
    \let\\\@centercr
    \bbl@startskip\z@skip
    \@rightskip\@flushglue
    \bbl@endskip\@rightskip
    \parindent\z@
    \parfillskip\bbl@startskip}
  \def\raggedleft{%
    \let\\\@centercr
    \bbl@startskip\@flushglue
    \bbl@endskip\z@skip
    \parindent\z@
    \parfillskip\bbl@endskip}
\fi
\IfBabelLayout{lists}
  {\bbl@sreplace\list
     {\@totalleftmargin\leftmargin}{\@totalleftmargin\bbl@listleftmargin}%
   \def\bbl@listleftmargin{%
     \ifcase\bbl@thepardir\leftmargin\else\rightmargin\fi}%
   \ifcase\bbl@engine
     \def\labelenumii{)\theenumii(}% pdftex doesn't reverse ()
     \def\p@enumiii{\p@enumii)\theenumii(}%
   \fi
   \bbl@sreplace\@verbatim
     {\leftskip\@totalleftmargin}%
     {\bbl@startskip\textwidth
      \advance\bbl@startskip-\linewidth}%
   \bbl@sreplace\@verbatim 
     {\rightskip\z@skip}%
     {\bbl@endskip\z@skip}}%
  {}
\IfBabelLayout{contents}
  {\bbl@sreplace\@dottedtocline{\leftskip}{\bbl@startskip}%
   \bbl@sreplace\@dottedtocline{\rightskip}{\bbl@endskip}}
  {}
\IfBabelLayout{columns}
  {\bbl@sreplace\@outputdblcol{\hb@xt@\textwidth}{\bbl@outputhbox}%
   \def\bbl@outputhbox#1{%
     \hb@xt@\textwidth{%
       \hskip\columnwidth
       \hfil
       {\normalcolor\vrule \@width\columnseprule}%
       \hfil
       \hb@xt@\columnwidth{\box\@leftcolumn \hss}%
       \hskip-\textwidth
       \hb@xt@\columnwidth{\box\@outputbox \hss}%
       \hskip\columnsep
       \hskip\columnwidth}}}%
  {}
<@Footnote changes@>
\IfBabelLayout{footnotes}%
  {\BabelFootnote\footnote\languagename{}{}%
   \BabelFootnote\localfootnote\languagename{}{}%
   \BabelFootnote\mainfootnote{}{}{}}
  {}
%    \end{macrocode}
%
%      Implicitly reverses sectioning labels in |bidi=basic|, because
%      the full stop is not in contact with L numbers any more. I
%      think there must be a better way.
%
%    \begin{macrocode}
\IfBabelLayout{counters}%
  {\let\bbl@latinarabic=\@arabic
   \def\@arabic#1{\babelsublr{\bbl@latinarabic#1}}%
   \let\bbl@asciiroman=\@roman
   \def\@roman#1{\babelsublr{\ensureascii{\bbl@asciiroman#1}}}%
   \let\bbl@asciiRoman=\@Roman
   \def\@Roman#1{\babelsublr{\ensureascii{\bbl@asciiRoman#1}}}}{}
%</texxet>
%    \end{macrocode}
%
% \subsection{LuaTeX}
%
% The loader for \luatex{} is based solely on |language.dat|, which
% is read on the fly. The code shouldn't be executed when the format
% is build, so we check if |\AddBabelHook| is defined. Then comes a
% modified version of the loader in |hyphen.cfg| (without the
% hyphenmins stuff, which is under the direct control of \babel).
%
% The names |\l@<language>| are defined and take some value from the
% beginning because all \texttt{ldf} files assume this for the
% corresponding language to be considered valid, but patterns are not
% loaded (except the first one). This is done later, when the language
% is first selected (which usually means when the \texttt{ldf}
% finishes). If a language has been loaded, |\bbl@hyphendata@<num>|
% exists (with the names of the files read).
%
% The default setup preloads the first language into the format. This
% is intended mainly for `english', so that it's available without
% further intervention from the user.  To avoid duplicating it, the
% following rule applies: if the ``0th'' language and the first
% language in |language.dat| have the same name then just ignore the
% latter. If there are new synonymous, the are added, but note if the
% language patterns have not been preloaded they won't at run time.
%
% Other preloaded languages could be read twice, if they have been
% preloaded into the format. This is not optimal, but it shouldn't
% happen very often -- with \luatex{} patterns are best loaded when
% the document is typeset, and the ``0th'' language is preloaded just
% for backwards compatibility.
%
% As of 1.1b, lua(e)tex is taken into account. Formerly, loading of
% patterns on the fly didn't work in this format, but with the new
% loader it does.  Unfortunately, the format is not based on \babel,
% and data could be duplicated, because languages are reassigned above
% those in the format (nothing serious, anyway). Note even with this
% format |language.dat| is used (under the principle of a single
% source), instead of |language.def|.
%
% Of course, there is room for improvements, like tools to read and
% reassign languages, which would require modifying the language list,
% and better error handling.
%
% We need catcode tables, but no format (targeted by \babel) provide a
% command to allocate them (although there are packages like
% \textsf{ctablestack}). FIX - This isn't true anymore. For the moment,
% a dangerous approach is used - just allocate a high random number and
% cross the fingers. To complicate things, \textsf{etex.sty} changes
% the way languages are allocated.
%
% This files is read at three places: (1) when |plain.def|, |babel.sty|
% starts, to read the list of available languages from |language.dat|
% (for the |base| option); (2) at hyphen.cfg, to modify some macros;
% (3) in the middle of |plain.def| and |babel.sty|, by |babel.def|,
% with the commands and other definitions for |luatex| (eg,
% |\babelpatterns|).
%  
%    \begin{macrocode}
%<*luatex>
\ifx\AddBabelHook\@undefined % When plain.def, babel.sty starts
\bbl@trace{Read language.dat}
\ifx\bbl@readstream\@undefined
  \csname newread\endcsname\bbl@readstream
\fi
\begingroup
  \toks@{}
  \count@\z@ % 0=start, 1=0th, 2=normal
  \def\bbl@process@line#1#2 #3 #4 {%
    \ifx=#1%
      \bbl@process@synonym{#2}%
    \else
      \bbl@process@language{#1#2}{#3}{#4}%
    \fi
    \ignorespaces}
  \def\bbl@manylang{%
    \ifnum\bbl@last>\@ne
      \bbl@info{Non-standard hyphenation setup}%
    \fi
    \let\bbl@manylang\relax}
  \def\bbl@process@language#1#2#3{%
    \ifcase\count@
      \@ifundefined{zth@#1}{\count@\tw@}{\count@\@ne}%
    \or
      \count@\tw@
    \fi
    \ifnum\count@=\tw@
      \expandafter\addlanguage\csname l@#1\endcsname
      \language\allocationnumber
      \chardef\bbl@last\allocationnumber
      \bbl@manylang
      \let\bbl@elt\relax
      \xdef\bbl@languages{%
        \bbl@languages\bbl@elt{#1}{\the\language}{#2}{#3}}%
    \fi
    \the\toks@
    \toks@{}}
  \def\bbl@process@synonym@aux#1#2{%
    \global\expandafter\chardef\csname l@#1\endcsname#2\relax
    \let\bbl@elt\relax
    \xdef\bbl@languages{%
      \bbl@languages\bbl@elt{#1}{#2}{}{}}}%
  \def\bbl@process@synonym#1{%
    \ifcase\count@
      \toks@\expandafter{\the\toks@\relax\bbl@process@synonym{#1}}%
    \or
      \@ifundefined{zth@#1}{\bbl@process@synonym@aux{#1}{0}}{}%
    \else
      \bbl@process@synonym@aux{#1}{\the\bbl@last}%
    \fi}
  \ifx\bbl@languages\@undefined % Just a (sensible?) guess
    \chardef\l@english\z@
    \chardef\l@USenglish\z@
    \chardef\bbl@last\z@
    \global\@namedef{bbl@hyphendata@0}{{hyphen.tex}{}}
    \gdef\bbl@languages{%
      \bbl@elt{english}{0}{hyphen.tex}{}%
      \bbl@elt{USenglish}{0}{}{}}
  \else
    \global\let\bbl@languages@format\bbl@languages
    \def\bbl@elt#1#2#3#4{% Remove all except language 0
      \ifnum#2>\z@\else
        \noexpand\bbl@elt{#1}{#2}{#3}{#4}%
      \fi}%
    \xdef\bbl@languages{\bbl@languages}%
  \fi
  \def\bbl@elt#1#2#3#4{\@namedef{zth@#1}{}} % Define flags
  \bbl@languages
  \openin\bbl@readstream=language.dat
  \ifeof\bbl@readstream
    \bbl@warning{I couldn't find language.dat. No additional\\%
                 patterns loaded. Reported}%
  \else
    \loop
      \endlinechar\m@ne
      \read\bbl@readstream to \bbl@line
      \endlinechar`\^^M
      \if T\ifeof\bbl@readstream F\fi T\relax
        \ifx\bbl@line\@empty\else
          \edef\bbl@line{\bbl@line\space\space\space}%
          \expandafter\bbl@process@line\bbl@line\relax
        \fi
    \repeat
  \fi
\endgroup
\bbl@trace{Macros for reading patterns files}
\def\bbl@get@enc#1:#2:#3\@@@{\def\bbl@hyph@enc{#2}}
\ifx\babelcatcodetablenum\@undefined
  \ifx\newcatcodetable\@undefined
    \def\babelcatcodetablenum{5211}
    \def\bbl@pattcodes{\numexpr\babelcatcodetablenum+1\relax}
  \else
    \newcatcodetable\babelcatcodetablenum
    \newcatcodetable\bbl@pattcodes
  \fi
\else
  \def\bbl@pattcodes{\numexpr\babelcatcodetablenum+1\relax}
\fi
\def\bbl@luapatterns#1#2{%
  \bbl@get@enc#1::\@@@
  \setbox\z@\hbox\bgroup
    \begingroup
      \savecatcodetable\babelcatcodetablenum\relax
      \initcatcodetable\bbl@pattcodes\relax
      \catcodetable\bbl@pattcodes\relax
        \catcode`\#=6  \catcode`\$=3 \catcode`\&=4 \catcode`\^=7
        \catcode`\_=8  \catcode`\{=1 \catcode`\}=2 \catcode`\~=13
        \catcode`\@=11 \catcode`\^^I=10 \catcode`\^^J=12
        \catcode`\<=12 \catcode`\>=12 \catcode`\*=12 \catcode`\.=12
        \catcode`\-=12 \catcode`\/=12 \catcode`\[=12 \catcode`\]=12
        \catcode`\`=12 \catcode`\'=12 \catcode`\"=12
        \input #1\relax
      \catcodetable\babelcatcodetablenum\relax
    \endgroup
    \def\bbl@tempa{#2}%
    \ifx\bbl@tempa\@empty\else
      \input #2\relax
    \fi
  \egroup}%
\def\bbl@patterns@lua#1{%
  \language=\expandafter\ifx\csname l@#1:\f@encoding\endcsname\relax
    \csname l@#1\endcsname
    \edef\bbl@tempa{#1}%
  \else
    \csname l@#1:\f@encoding\endcsname
    \edef\bbl@tempa{#1:\f@encoding}%
  \fi\relax
  \@namedef{lu@texhyphen@loaded@\the\language}{}% Temp
  \@ifundefined{bbl@hyphendata@\the\language}%
    {\def\bbl@elt##1##2##3##4{%
       \ifnum##2=\csname l@\bbl@tempa\endcsname % #2=spanish, dutch:OT1...
         \def\bbl@tempb{##3}%
         \ifx\bbl@tempb\@empty\else % if not a synonymous
           \def\bbl@tempc{{##3}{##4}}%
         \fi
         \bbl@csarg\xdef{hyphendata@##2}{\bbl@tempc}%
       \fi}%
     \bbl@languages
     \@ifundefined{bbl@hyphendata@\the\language}%
       {\bbl@info{No hyphenation patterns were set for\\%
                  language '\bbl@tempa'. Reported}}%
       {\expandafter\expandafter\expandafter\bbl@luapatterns
          \csname bbl@hyphendata@\the\language\endcsname}}{}}
\endinput\fi
  % Here ends \ifx\AddBabelHook\@undefined
  % A few lines are only read by hyphen.cfg
\ifx\DisableBabelHook\@undefined
  \AddBabelHook{luatex}{everylanguage}{%
    \def\process@language##1##2##3{%
      \def\process@line####1####2 ####3 ####4 {}}}
  \AddBabelHook{luatex}{loadpatterns}{%
     \input #1\relax
     \expandafter\gdef\csname bbl@hyphendata@\the\language\endcsname
       {{#1}{}}}
  \AddBabelHook{luatex}{loadexceptions}{%
     \input #1\relax
     \def\bbl@tempb##1##2{{##1}{#1}}%
     \expandafter\xdef\csname bbl@hyphendata@\the\language\endcsname
       {\expandafter\expandafter\expandafter\bbl@tempb
        \csname bbl@hyphendata@\the\language\endcsname}}
\endinput\fi
  % Here stops reading code for hyphen.cfg
  % The following is read the 2nd time it's loaded
\begingroup  % TODO - to a lua file
\catcode`\%=12
\catcode`\'=12
\catcode`\"=12
\catcode`\:=12
\directlua{
  Babel = Babel or {}
  function Babel.bytes(line)
    return line:gsub("(.)",
      function (chr) return unicode.utf8.char(string.byte(chr)) end)
  end
  function Babel.begin_process_input()
    if luatexbase and luatexbase.add_to_callback then
      luatexbase.add_to_callback('process_input_buffer',
                                 Babel.bytes,'Babel.bytes')
    else
      Babel.callback = callback.find('process_input_buffer')
      callback.register('process_input_buffer',Babel.bytes)
    end
  end
  function Babel.end_process_input ()
    if luatexbase and luatexbase.remove_from_callback then
      luatexbase.remove_from_callback('process_input_buffer','Babel.bytes')
    else
      callback.register('process_input_buffer',Babel.callback)
    end
  end
  function Babel.addpatterns(pp, lg)
    local lg = lang.new(lg)
    local pats = lang.patterns(lg) or ''
    lang.clear_patterns(lg)
    for p in pp:gmatch('[^%s]+') do
      ss = ''
      for i in string.utfcharacters(p:gsub('%d', '')) do
         ss = ss .. '%d?' .. i
      end
      ss = ss:gsub('^%%d%?%.', '%%.') .. '%d?'
      ss = ss:gsub('%.%%d%?$', '%%.')
      pats, n = pats:gsub('%s' .. ss .. '%s', ' ' .. p .. ' ')
      if n == 0 then
        tex.sprint(
          [[\string\csname\space bbl@info\endcsname{New pattern: ]]
          .. p .. [[}]])
        pats = pats .. ' ' .. p
      else
        tex.sprint(
          [[\string\csname\space bbl@info\endcsname{Renew pattern: ]]
          .. p .. [[}]])
      end
    end
    lang.patterns(lg, pats)
  end
}
\endgroup
\ifx\newattribute\@undefined\else
  \newattribute\bbl@attr@locale
  \directlua{ Babel.attr_locale = luatexbase.registernumber'bbl@attr@locale'}
  \AddBabelHook{luatex}{beforeextras}{%
    \setattribute\bbl@attr@locale\localeid}
\fi
\def\BabelStringsDefault{unicode}
\let\luabbl@stop\relax
\AddBabelHook{luatex}{encodedcommands}{%
  \def\bbl@tempa{utf8}\def\bbl@tempb{#1}%
  \ifx\bbl@tempa\bbl@tempb\else
    \directlua{Babel.begin_process_input()}%
    \def\luabbl@stop{%
      \directlua{Babel.end_process_input()}}%
  \fi}%
\AddBabelHook{luatex}{stopcommands}{%
  \luabbl@stop
  \let\luabbl@stop\relax}
\AddBabelHook{luatex}{patterns}{%
  \@ifundefined{bbl@hyphendata@\the\language}%
    {\def\bbl@elt##1##2##3##4{%
       \ifnum##2=\csname l@#2\endcsname % #2=spanish, dutch:OT1...
         \def\bbl@tempb{##3}%
         \ifx\bbl@tempb\@empty\else % if not a synonymous
           \def\bbl@tempc{{##3}{##4}}%
         \fi
         \bbl@csarg\xdef{hyphendata@##2}{\bbl@tempc}%
       \fi}%
     \bbl@languages
     \@ifundefined{bbl@hyphendata@\the\language}%
       {\bbl@info{No hyphenation patterns were set for\\%
                  language '#2'. Reported}}%
       {\expandafter\expandafter\expandafter\bbl@luapatterns
          \csname bbl@hyphendata@\the\language\endcsname}}{}%
  \@ifundefined{bbl@patterns@}{}{%
    \begingroup
      \bbl@xin@{,\number\language,}{,\bbl@pttnlist}%
      \ifin@\else
        \ifx\bbl@patterns@\@empty\else
           \directlua{ Babel.addpatterns(
             [[\bbl@patterns@]], \number\language) }%
        \fi
        \@ifundefined{bbl@patterns@#1}%
          \@empty
          {\directlua{ Babel.addpatterns(
               [[\space\csname bbl@patterns@#1\endcsname]],
               \number\language) }}%
        \xdef\bbl@pttnlist{\bbl@pttnlist\number\language,}%
      \fi
    \endgroup}%
  \bbl@exp{%
    \bbl@ifunset{bbl@prehc@\languagename}{}%
      {\\\bbl@ifblank{\bbl@cs{prehc@\languagename}}{}%
        {\prehyphenchar=\bbl@cl{prehc}\relax}}}}
%    \end{macrocode}
%
%  \begin{macro}{\babelpatterns}
%
%    This macro adds patterns. Two macros are used to store them:
%    |\bbl@patterns@| for the global ones and |\bbl@patterns@<lang>|
%    for language ones. We make sure there is a space between words
%    when multiple commands are used.
%
%    \begin{macrocode}
\@onlypreamble\babelpatterns
\AtEndOfPackage{%
  \newcommand\babelpatterns[2][\@empty]{%
    \ifx\bbl@patterns@\relax
      \let\bbl@patterns@\@empty
    \fi
    \ifx\bbl@pttnlist\@empty\else
      \bbl@warning{%
        You must not intermingle \string\selectlanguage\space and\\%
        \string\babelpatterns\space or some patterns will not\\%
        be taken into account. Reported}%
    \fi
    \ifx\@empty#1%
      \protected@edef\bbl@patterns@{\bbl@patterns@\space#2}%
    \else
      \edef\bbl@tempb{\zap@space#1 \@empty}%
      \bbl@for\bbl@tempa\bbl@tempb{%
        \bbl@fixname\bbl@tempa
        \bbl@iflanguage\bbl@tempa{%
          \bbl@csarg\protected@edef{patterns@\bbl@tempa}{%
            \@ifundefined{bbl@patterns@\bbl@tempa}%
              \@empty
              {\csname bbl@patterns@\bbl@tempa\endcsname\space}%
            #2}}}%
    \fi}}
%    \end{macrocode}
%  \end{macro}
%
% \subsection{Southeast Asian scripts}
%
% First, some general code for line breaking, used by
% |\babelposthyphenation|.
%
% Replace regular (ie, implicit) discretionaries by spaceskips, based
% on the previous glyph (which I think makes sense, because the hyphen
% and the previous char go always together). Other discretionaries are
% not touched. See Unicode UAX 14.
%
%    \begin{macrocode}
% TODO - to a lua file
\directlua{
  Babel = Babel or {}
  Babel.linebreaking = Babel.linebreaking or {}
  Babel.linebreaking.before = {}
  Babel.linebreaking.after = {}
  Babel.locale = {} % Free to use, indexed by \localeid
  function Babel.linebreaking.add_before(func)
    tex.print([[\noexpand\csname bbl@luahyphenate\endcsname]])
    table.insert(Babel.linebreaking.before, func)
  end
  function Babel.linebreaking.add_after(func)
    tex.print([[\noexpand\csname bbl@luahyphenate\endcsname]])
    table.insert(Babel.linebreaking.after, func)
  end
}
\def\bbl@intraspace#1 #2 #3\@@{%
  \directlua{
    Babel = Babel or {}
    Babel.intraspaces = Babel.intraspaces or {}
    Babel.intraspaces['\csname bbl@sbcp@\languagename\endcsname'] = %
       {b = #1, p = #2, m = #3}
    Babel.locale_props[\the\localeid].intraspace = %
       {b = #1, p = #2, m = #3}
  }}
\def\bbl@intrapenalty#1\@@{%
  \directlua{
    Babel = Babel or {}
    Babel.intrapenalties = Babel.intrapenalties or {}
    Babel.intrapenalties['\csname bbl@sbcp@\languagename\endcsname'] = #1
    Babel.locale_props[\the\localeid].intrapenalty = #1
  }}
\begingroup
\catcode`\%=12
\catcode`\^=14
\catcode`\'=12
\catcode`\~=12
\gdef\bbl@seaintraspace{^
  \let\bbl@seaintraspace\relax
  \directlua{
    Babel = Babel or {}
    Babel.sea_enabled = true
    Babel.sea_ranges = Babel.sea_ranges or {}
    function Babel.set_chranges (script, chrng) 
      local c = 0
      for s, e in string.gmatch(chrng..' ', '(.-)%.%.(.-)%s') do
        Babel.sea_ranges[script..c]={tonumber(s,16), tonumber(e,16)}
        c = c + 1
      end
    end
    function Babel.sea_disc_to_space (head)
      local sea_ranges = Babel.sea_ranges
      local last_char = nil
      local quad = 655360      ^% 10 pt = 655360 = 10 * 65536
      for item in node.traverse(head) do
        local i = item.id
        if i == node.id'glyph' then
          last_char = item
        elseif i == 7 and item.subtype == 3 and last_char 
            and last_char.char > 0x0C99 then
          quad = font.getfont(last_char.font).size
          for lg, rg in pairs(sea_ranges) do
            if last_char.char > rg[1] and last_char.char < rg[2] then
              lg = lg:sub(1, 4)  ^% Remove trailing number of, eg, Cyrl1
              local intraspace = Babel.intraspaces[lg]
              local intrapenalty = Babel.intrapenalties[lg]
              local n
              if intrapenalty ~= 0 then
                n = node.new(14, 0)     ^% penalty
                n.penalty = intrapenalty
                node.insert_before(head, item, n)
              end    
              n = node.new(12, 13)      ^% (glue, spaceskip)
              node.setglue(n, intraspace.b * quad,
                              intraspace.p * quad,
                              intraspace.m * quad)
              node.insert_before(head, item, n)
              node.remove(head, item)
            end
          end
        end
      end
    end
  }^^
  \bbl@luahyphenate}  
%    \end{macrocode}
%    
% \subsection{CJK line breaking}
%
% Minimal line breaking for CJK scripts, mainly intended for simple
% documents and short texts as a secundary language. Only line
% breaking, with a little stretching for justification, without any
% attempt to adjust the spacing. It is based on (but does not strictly
% follow) the Unicode algorithm.
%
% We first need a little table with the corresponding line breaking
% properties. A few characters have an additional key for the width
% (fullwidth \textit{vs.} halfwidth), not yet used. There is a separate
% file, defined below.
%
%    \begin{macrocode}
\catcode`\%=14
\gdef\bbl@cjkintraspace{%
  \let\bbl@cjkintraspace\relax
  \directlua{
    Babel = Babel or {}
    require('babel-data-cjk.lua')
    Babel.cjk_enabled = true
    function Babel.cjk_linebreak(head)
      local GLYPH = node.id'glyph'
      local last_char = nil
      local quad = 655360      % 10 pt = 655360 = 10 * 65536
      local last_class = nil
      local last_lang = nil

      for item in node.traverse(head) do
        if item.id == GLYPH then

          local lang = item.lang

          local LOCALE = node.get_attribute(item,
                luatexbase.registernumber'bbl@attr@locale')
          local props = Babel.locale_props[LOCALE]

          local class = Babel.cjk_class[item.char].c

          if class == 'cp' then class = 'cl' end % )] as CL
          if class == 'id' then class = 'I' end

          local br = 0
          if class and last_class and Babel.cjk_breaks[last_class][class] then 
            br = Babel.cjk_breaks[last_class][class]
          end

          if br == 1 and props.linebreak == 'c' and
              lang ~= \the\l@nohyphenation\space and
              last_lang ~= \the\l@nohyphenation then
            local intrapenalty = props.intrapenalty
            if intrapenalty ~= 0 then
              local n = node.new(14, 0)     % penalty
              n.penalty = intrapenalty
              node.insert_before(head, item, n)
            end    
            local intraspace = props.intraspace
            local n = node.new(12, 13)      % (glue, spaceskip)
            node.setglue(n, intraspace.b * quad,
                            intraspace.p * quad,
                            intraspace.m * quad)
            node.insert_before(head, item, n)
          end

          if font.getfont(item.font) then
            quad = font.getfont(item.font).size
          end
          last_class = class
          last_lang = lang
        else % if penalty, glue or anything else
          last_class = nil
        end
      end
      lang.hyphenate(head)
    end
  }%
  \bbl@luahyphenate}
\gdef\bbl@luahyphenate{%
  \let\bbl@luahyphenate\relax
  \directlua{
    luatexbase.add_to_callback('hyphenate',
    function (head, tail)
      if Babel.linebreaking.before then
        for k, func in ipairs(Babel.linebreaking.before)  do
          func(head)
        end
      end
      if Babel.cjk_enabled then
        Babel.cjk_linebreak(head)
      end
      lang.hyphenate(head)
      if Babel.linebreaking.after then
        for k, func in ipairs(Babel.linebreaking.after)  do
          func(head)
        end
      end
      if Babel.sea_enabled then
        Babel.sea_disc_to_space(head)
      end
    end,
    'Babel.hyphenate')
  }
}
\endgroup
\def\bbl@provide@intraspace{%
  \bbl@ifunset{bbl@intsp@\languagename}{}%
    {\expandafter\ifx\csname bbl@intsp@\languagename\endcsname\@empty\else
       \bbl@xin@{/c}{/\bbl@cl{lnbrk}}%
       \ifin@           % cjk
         \bbl@cjkintraspace
         \directlua{
             Babel = Babel or {}
             Babel.locale_props = Babel.locale_props or {}
             Babel.locale_props[\the\localeid].linebreak = 'c'
         }%
         \bbl@exp{\\\bbl@intraspace\bbl@cl{intsp}\\\@@}%
         \ifx\bbl@KVP@intrapenalty\@nil
           \bbl@intrapenalty0\@@
         \fi 
       \else            % sea
         \bbl@seaintraspace
         \bbl@exp{\\\bbl@intraspace\bbl@cl{intsp}\\\@@}%
         \directlua{
            Babel = Babel or {}
            Babel.sea_ranges = Babel.sea_ranges or {}
            Babel.set_chranges('\bbl@cl{sbcp}', 
                               '\bbl@cl{chrng}')
         }%
         \ifx\bbl@KVP@intrapenalty\@nil
           \bbl@intrapenalty0\@@
         \fi
       \fi
     \fi
     \ifx\bbl@KVP@intrapenalty\@nil\else
       \expandafter\bbl@intrapenalty\bbl@KVP@intrapenalty\@@
     \fi}}
%    \end{macrocode}
%
% \subsection{Arabic justification}
%
%    \begin{macrocode}
\ifnum\bbl@bidimode>100 \ifnum\bbl@bidimode<200
\def\bblar@chars{%
  0628,0629,062A,062B,062C,062D,062E,062F,0630,0631,0632,0633,%
  0634,0635,0636,0637,0638,0639,063A,063B,063C,063D,063E,063F,%
  0640,0641,0642,0643,0644,0645,0646,0647,0649}
\def\bblar@elongated{%
  0626,0628,062A,062B,0633,0634,0635,0636,063B,%
  063C,063D,063E,063F,0641,0642,0643,0644,0646,%
  0649,064A}
\begingroup
  \catcode`_=11 \catcode`:=11
  \gdef\bblar@nofswarn{\gdef\msg_warning:nnx##1##2##3{}}
\endgroup
\gdef\bbl@arabicjust{%
  \let\bbl@arabicjust\relax
  \newattribute\bblar@kashida
  \bblar@kashida=\z@
  \expandafter\bbl@add\csname selectfont \endcsname{{\bbl@parsejalt}}%
  \directlua{
    Babel.arabic.elong_map   = Babel.arabic.elong_map or {}
    Babel.arabic.elong_map[\the\localeid]   = {}
    luatexbase.add_to_callback('post_linebreak_filter',
      Babel.arabic.justify, 'Babel.arabic.justify')
    luatexbase.add_to_callback('hpack_filter',
      Babel.arabic.justify_hbox, 'Babel.arabic.justify_hbox')
  }}% 
% Save both node lists to make replacement. TODO. Save also widths to
% make computations
\def\bblar@fetchjalt#1#2#3#4{%
  \bbl@exp{\\\bbl@foreach{#1}}{%
    \bbl@ifunset{bblar@JE@##1}%
      {\setbox\z@\hbox{^^^^200d\char"##1#2}}%
      {\setbox\z@\hbox{^^^^200d\char"\@nameuse{bblar@JE@##1}#2}}%
    \directlua{%
      local last = nil
      for item in node.traverse(tex.box[0].head) do
        if item.id == node.id'glyph' and item.char > 0x600 and
            not (item.char == 0x200D) then
          last = item
        end
      end
      Babel.arabic.#3['##1#4'] = last.char
    }}}
% Brute force. No rules at all, yet. The ideal: look at jalt table. And
% perhaps other tables (falt?, cswh?). What about kaf? And diacritic
% positioning?
\gdef\bbl@parsejalt{%
  \ifx\addfontfeature\@undefined\else
    \bbl@xin@{/e}{/\bbl@cl{lnbrk}}%
    \ifin@
      \directlua{%
        if Babel.arabic.elong_map[\the\localeid][\fontid\font] == nil then
          Babel.arabic.elong_map[\the\localeid][\fontid\font] = {}
          tex.print([[\string\csname\space bbl@parsejalti\endcsname]])
        end
      }%
    \fi
  \fi}
\gdef\bbl@parsejalti{%
  \begingroup
    \let\bbl@parsejalt\relax     % To avoid infinite loop
    \edef\bbl@tempb{\fontid\font}%
    \bblar@nofswarn
    \bblar@fetchjalt\bblar@elongated{}{from}{}%
    \bblar@fetchjalt\bblar@chars{^^^^064a}{from}{a}% Alef maksura
    \bblar@fetchjalt\bblar@chars{^^^^0649}{from}{y}% Yeh
    \addfontfeature{RawFeature=+jalt}%
    % \@namedef{bblar@JE@0643}{06AA}% todo: catch medial kaf
    \bblar@fetchjalt\bblar@elongated{}{dest}{}%
    \bblar@fetchjalt\bblar@chars{^^^^064a}{dest}{a}%
    \bblar@fetchjalt\bblar@chars{^^^^0649}{dest}{y}%
      \directlua{%
        for k, v in pairs(Babel.arabic.from) do
          if Babel.arabic.dest[k] and
              not (Babel.arabic.from[k] == Babel.arabic.dest[k]) then
            Babel.arabic.elong_map[\the\localeid][\bbl@tempb]
               [Babel.arabic.from[k]] = Babel.arabic.dest[k]
          end
        end
      }%
  \endgroup}
%
\begingroup
\catcode`#=11
\catcode`~=11
\directlua{

Babel.arabic = Babel.arabic or {}
Babel.arabic.from = {}
Babel.arabic.dest = {}
Babel.arabic.justify_factor = 0.95
Babel.arabic.justify_enabled = true

function Babel.arabic.justify(head)
  if not Babel.arabic.justify_enabled then return head end
  for line in node.traverse_id(node.id'hlist', head) do
    Babel.arabic.justify_hlist(head, line)
  end
  return head
end

function Babel.arabic.justify_hbox(head, gc, size, pack)
  local has_inf = false
  if Babel.arabic.justify_enabled and pack == 'exactly' then
    for n in node.traverse_id(12, head) do
      if n.stretch_order > 0 then has_inf = true end
    end
    if not has_inf then
      Babel.arabic.justify_hlist(head, nil, gc, size, pack)
    end
  end
  return head
end

function Babel.arabic.justify_hlist(head, line, gc, size, pack)
  local d, new
  local k_list, k_item, pos_inline
  local width, width_new, full, k_curr, wt_pos, goal, shift
  local subst_done = false
  local elong_map = Babel.arabic.elong_map
  local last_line
  local GLYPH = node.id'glyph'
  local KASHIDA = luatexbase.registernumber'bblar@kashida'
  local LOCALE = luatexbase.registernumber'bbl@attr@locale'
  
  if line == nil then
    line = {}
    line.glue_sign = 1
    line.glue_order = 0
    line.head = head
    line.shift = 0
    line.width = size
  end

  % Exclude last line. todo. But-- it discards one-word lines, too!
  % ? Look for glue = 12:15
  if (line.glue_sign == 1 and line.glue_order == 0) then
    elongs = {}     % Stores elongated candidates of each line
    k_list = {}     % And all letters with kashida
    pos_inline = 0  % Not yet used

    for n in node.traverse_id(GLYPH, line.head) do
      pos_inline = pos_inline + 1 % To find where it is. Not used.

      % Elongated glyphs
      if elong_map then
        local locale = node.get_attribute(n, LOCALE)
        if elong_map[locale] and elong_map[locale][n.font] and 
            elong_map[locale][n.font][n.char] then
          table.insert(elongs, {node = n, locale = locale} )
          node.set_attribute(n.prev, KASHIDA, 0)
        end
      end

      % Tatwil
      if Babel.kashida_wts then
        local k_wt = node.get_attribute(n, KASHIDA)
        if k_wt > 0 then % todo. parameter for multi inserts
          table.insert(k_list, {node = n, weight = k_wt, pos = pos_inline})
        end
      end

    end % of node.traverse_id

    if #elongs == 0 and #k_list == 0 then goto next_line end
    full  = line.width
    shift = line.shift
    goal  = full * Babel.arabic.justify_factor % A bit crude
    width = node.dimensions(line.head)    % The 'natural' width

    % == Elongated ==
    % Original idea taken from 'chikenize'
    while (#elongs > 0 and width < goal) do
      subst_done = true
      local x = #elongs
      local curr = elongs[x].node
      local oldchar = curr.char
      curr.char = elong_map[elongs[x].locale][curr.font][curr.char]
      width = node.dimensions(line.head)  % Check if the line is too wide
      % Substitute back if the line would be too wide and break:
      if width > goal then
        curr.char = oldchar
        break
      end 
      % If continue, pop the just substituted node from the list:
      table.remove(elongs, x)
    end

    % == Tatwil ==
    if #k_list == 0 then goto next_line end

    width = node.dimensions(line.head)    % The 'natural' width
    k_curr = #k_list
    wt_pos = 1

    while width < goal do
      subst_done = true
      k_item = k_list[k_curr].node
      if k_list[k_curr].weight == Babel.kashida_wts[wt_pos] then       
        d = node.copy(k_item)
        d.char = 0x0640
        line.head, new = node.insert_after(line.head, k_item, d)
        width_new = node.dimensions(line.head)
        if width > goal or width == width_new then
          node.remove(line.head, new) % Better compute before
          break
        end
        width = width_new
      end
      if k_curr == 1 then
        k_curr = #k_list
        wt_pos = (wt_pos >= table.getn(Babel.kashida_wts)) and 1 or wt_pos+1   
      else
        k_curr = k_curr - 1
      end
    end

    ::next_line::

    % Must take into account marks and ins, see luatex manual.
    % Have to be executed only if there are changes. Investigate
    % what's going on exactly.
    if subst_done and not gc then
      d = node.hpack(line.head, full, 'exactly')
      d.shift = shift
      node.insert_before(head, line, d)
      node.remove(head, line)
    end
  end % if process line
end
}
\endgroup
\fi\fi % Arabic just block
%    \end{macrocode}
%
% \subsection{Common stuff}
%
%    \begin{macrocode}
\AddBabelHook{babel-fontspec}{afterextras}{\bbl@switchfont}
\AddBabelHook{babel-fontspec}{beforestart}{\bbl@ckeckstdfonts}
\DisableBabelHook{babel-fontspec}
<@Font selection@>
%    \end{macrocode}
%
% \subsection{Automatic fonts and ids switching}
%
% After defining the blocks for a number of scripts (must be extended
% and very likely fine tuned), we define a short function which just
% traverse the node list to carry out the replacements. The table
% |loc_to_scr| gets the locale form a script range (note the locale is
% the key, and that there is an intermediate table built on the fly for
% optimization). This locale is then used to get the |\language| and
% the |\localeid| as stored in |locale_props|, as well as the font (as
% requested). In the latter table a key starting with |/| maps the font
% from the global one (the key) to the local one (the value). Maths are
% skipped and discretionaries are handled in a special way.
%
%    \begin{macrocode}
% TODO - to a lua file
\directlua{
Babel.script_blocks = {
  ['dflt'] = {},
  ['Arab'] = {{0x0600, 0x06FF}, {0x08A0, 0x08FF}, {0x0750, 0x077F},
              {0xFE70, 0xFEFF}, {0xFB50, 0xFDFF}, {0x1EE00, 0x1EEFF}},
  ['Armn'] = {{0x0530, 0x058F}},
  ['Beng'] = {{0x0980, 0x09FF}}, 
  ['Cher'] = {{0x13A0, 0x13FF}, {0xAB70, 0xABBF}},   
  ['Copt'] = {{0x03E2, 0x03EF}, {0x2C80, 0x2CFF}, {0x102E0, 0x102FF}},
  ['Cyrl'] = {{0x0400, 0x04FF}, {0x0500, 0x052F}, {0x1C80, 0x1C8F},
              {0x2DE0, 0x2DFF}, {0xA640, 0xA69F}},
  ['Deva'] = {{0x0900, 0x097F}, {0xA8E0, 0xA8FF}},
  ['Ethi'] = {{0x1200, 0x137F}, {0x1380, 0x139F}, {0x2D80, 0x2DDF},
              {0xAB00, 0xAB2F}},
  ['Geor'] = {{0x10A0, 0x10FF}, {0x2D00, 0x2D2F}},
  % Don't follow strictly Unicode, which places some Coptic letters in
  % the 'Greek and Coptic' block
  ['Grek'] = {{0x0370, 0x03E1}, {0x03F0, 0x03FF}, {0x1F00, 0x1FFF}},
  ['Hans'] = {{0x2E80, 0x2EFF}, {0x3000, 0x303F}, {0x31C0, 0x31EF},
              {0x3300, 0x33FF}, {0x3400, 0x4DBF}, {0x4E00, 0x9FFF},
              {0xF900, 0xFAFF}, {0xFE30, 0xFE4F}, {0xFF00, 0xFFEF},
              {0x20000, 0x2A6DF}, {0x2A700, 0x2B73F},
              {0x2B740, 0x2B81F}, {0x2B820, 0x2CEAF},
              {0x2CEB0, 0x2EBEF}, {0x2F800, 0x2FA1F}},
  ['Hebr'] = {{0x0590, 0x05FF}},
  ['Jpan'] = {{0x3000, 0x303F}, {0x3040, 0x309F}, {0x30A0, 0x30FF},
              {0x4E00, 0x9FAF}, {0xFF00, 0xFFEF}},
  ['Khmr'] = {{0x1780, 0x17FF}, {0x19E0, 0x19FF}},
  ['Knda'] = {{0x0C80, 0x0CFF}},
  ['Kore'] = {{0x1100, 0x11FF}, {0x3000, 0x303F}, {0x3130, 0x318F},
              {0x4E00, 0x9FAF}, {0xA960, 0xA97F}, {0xAC00, 0xD7AF},
              {0xD7B0, 0xD7FF}, {0xFF00, 0xFFEF}},
  ['Laoo'] = {{0x0E80, 0x0EFF}},
  ['Latn'] = {{0x0000, 0x007F}, {0x0080, 0x00FF}, {0x0100, 0x017F},
              {0x0180, 0x024F}, {0x1E00, 0x1EFF}, {0x2C60, 0x2C7F},
              {0xA720, 0xA7FF}, {0xAB30, 0xAB6F}},
  ['Mahj'] = {{0x11150, 0x1117F}},
  ['Mlym'] = {{0x0D00, 0x0D7F}},
  ['Mymr'] = {{0x1000, 0x109F}, {0xAA60, 0xAA7F}, {0xA9E0, 0xA9FF}},
  ['Orya'] = {{0x0B00, 0x0B7F}},
  ['Sinh'] = {{0x0D80, 0x0DFF}, {0x111E0, 0x111FF}},
  ['Syrc'] = {{0x0700, 0x074F}, {0x0860, 0x086F}},
  ['Taml'] = {{0x0B80, 0x0BFF}},
  ['Telu'] = {{0x0C00, 0x0C7F}},
  ['Tfng'] = {{0x2D30, 0x2D7F}},
  ['Thai'] = {{0x0E00, 0x0E7F}},
  ['Tibt'] = {{0x0F00, 0x0FFF}},
  ['Vaii'] = {{0xA500, 0xA63F}},
  ['Yiii'] = {{0xA000, 0xA48F}, {0xA490, 0xA4CF}}
}

Babel.script_blocks.Cyrs = Babel.script_blocks.Cyrl
Babel.script_blocks.Hant = Babel.script_blocks.Hans
Babel.script_blocks.Kana = Babel.script_blocks.Jpan

function Babel.locale_map(head)
  if not Babel.locale_mapped then return head end

  local LOCALE = luatexbase.registernumber'bbl@attr@locale'
  local GLYPH = node.id('glyph')
  local inmath = false
  local toloc_save
  for item in node.traverse(head) do
    local toloc
    if not inmath and item.id == GLYPH then
      % Optimization: build a table with the chars found
      if Babel.chr_to_loc[item.char] then
        toloc = Babel.chr_to_loc[item.char]
      else
        for lc, maps in pairs(Babel.loc_to_scr) do
          for _, rg in pairs(maps) do
            if item.char >= rg[1] and item.char <= rg[2] then
              Babel.chr_to_loc[item.char] = lc
              toloc = lc
              break
            end
          end
        end
      end
      % Now, take action, but treat composite chars in a different
      % fashion, because they 'inherit' the previous locale. Not yet
      % optimized.
      if not toloc and 
          (item.char >= 0x0300 and item.char <= 0x036F) or
          (item.char >= 0x1AB0 and item.char <= 0x1AFF) or
          (item.char >= 0x1DC0 and item.char <= 0x1DFF) then
        toloc = toloc_save
      end
      if toloc and toloc > -1 then
        if Babel.locale_props[toloc].lg then
          item.lang = Babel.locale_props[toloc].lg
          node.set_attribute(item, LOCALE, toloc)
        end      
        if Babel.locale_props[toloc]['/'..item.font] then
          item.font = Babel.locale_props[toloc]['/'..item.font]
        end
        toloc_save = toloc
      end
    elseif not inmath and item.id == 7 then
      item.replace = item.replace and Babel.locale_map(item.replace)
      item.pre     = item.pre and Babel.locale_map(item.pre)
      item.post    = item.post and Babel.locale_map(item.post)  
    elseif item.id == node.id'math' then
      inmath = (item.subtype == 0)
    end
  end
  return head
end
}
%    \end{macrocode}
%
% The code for |\babelcharproperty| is straightforward. Just note the
% modified lua table can be different.
%
%    \begin{macrocode}
\newcommand\babelcharproperty[1]{%
  \count@=#1\relax
  \ifvmode
    \expandafter\bbl@chprop
  \else
    \bbl@error{\string\babelcharproperty\space can be used only in\\%
               vertical mode (preamble or between paragraphs)}%
              {See the manual for futher info}%
  \fi}
\newcommand\bbl@chprop[3][\the\count@]{%
  \@tempcnta=#1\relax
  \bbl@ifunset{bbl@chprop@#2}%
    {\bbl@error{No property named '#2'. Allowed values are\\%
                direction (bc), mirror (bmg), and linebreak (lb)}%
               {See the manual for futher info}}%
    {}%
  \loop
    \bbl@cs{chprop@#2}{#3}%
  \ifnum\count@<\@tempcnta
    \advance\count@\@ne
  \repeat}
\def\bbl@chprop@direction#1{%
  \directlua{
    Babel.characters[\the\count@] =  Babel.characters[\the\count@] or {}
    Babel.characters[\the\count@]['d'] = '#1'
  }}
\let\bbl@chprop@bc\bbl@chprop@direction
\def\bbl@chprop@mirror#1{%
  \directlua{
    Babel.characters[\the\count@] =  Babel.characters[\the\count@] or {}
    Babel.characters[\the\count@]['m'] = '\number#1' 
  }}
\let\bbl@chprop@bmg\bbl@chprop@mirror
\def\bbl@chprop@linebreak#1{%
  \directlua{
    Babel.cjk_characters[\the\count@] = Babel.cjk_characters[\the\count@] or {}
    Babel.cjk_characters[\the\count@]['c'] = '#1'
  }}
\let\bbl@chprop@lb\bbl@chprop@linebreak
\def\bbl@chprop@locale#1{%
  \directlua{
    Babel.chr_to_loc = Babel.chr_to_loc or {}
    Babel.chr_to_loc[\the\count@] =
      \bbl@ifblank{#1}{-1000}{\the\bbl@cs{id@@#1}}\space
  }}
%    \end{macrocode}
%
% Post-handling hyphenation patterns for non-standard rules, like |ff|
% to |ff-f|. There are still some issues with speed (not very slow, but
% still slow).
%
% After declaring the table containing the patterns with their
% replacements, we define some auxiliary functions: |str_to_nodes|
% converts the string returned by a function to a node list, taking the
% node at |base| as a model (font, language, etc.); |fetch_word|
% fetches a series of glyphs and discretionaries, which |pattern| is
% matched against (if there is a match, it is called again before
% trying other patterns, and this is very likely the main bottleneck).
%
% |post_hyphenate_replace| is the callback applied after
% |lang.hyphenate|. This means the automatic hyphenation points are
% known. As empty captures return a byte position (as explained in the
% \luatex{} manual), we must convert it to a utf8 position. With
% |first|, the last byte can be the leading byte in a utf8 sequence, so
% we just remove it and add 1 to the resulting length. With |last| we
% must take into account the capture position points to the next
% character. Here |word_head| points to the starting node of the text
% to be matched.
%  
%    \begin{macrocode}
\begingroup % TODO - to a lua file
\catcode`\~=12
\catcode`\#=12
\catcode`\%=12
\catcode`\&=14
\directlua{
  Babel.linebreaking.replacements = {}
  Babel.linebreaking.replacements[0] = {}  &% pre
  Babel.linebreaking.replacements[1] = {}  &% post

  &% Discretionaries contain strings as nodes
  function Babel.str_to_nodes(fn, matches, base)
    local n, head, last    
    if fn == nil then return nil end
    for s in string.utfvalues(fn(matches)) do
      if base.id == 7 then 
        base = base.replace
      end
      n = node.copy(base)
      n.char    = s
      if not head then
        head = n
      else
        last.next = n
      end
      last = n
    end 
    return head
  end

  Babel.fetch_subtext = {}

  Babel.ignore_pre_char = function(node)
    return (node.lang == \the\l@nohyphenation)
  end

  &% Merging both functions doesn't seen feasible, because there are too
  &% many differences.
  Babel.fetch_subtext[0] = function(head)
    local word_string = ''
    local word_nodes = {}
    local lang
    local item = head
    local inmath = false

    while item do

      if item.id == 11 then
        inmath = (item.subtype == 0)
      end

      if inmath then
        &% pass

      elseif item.id == 29 then
        local locale = node.get_attribute(item, Babel.attr_locale)

        if lang == locale or lang == nil then
          lang = lang or locale
          if Babel.ignore_pre_char(item) then  
            word_string = word_string .. Babel.us_char
          else
            word_string = word_string .. unicode.utf8.char(item.char)
          end
          word_nodes[#word_nodes+1] = item
        else
          break
        end

      elseif item.id == 12 and item.subtype == 13 then
        word_string = word_string .. ' '
        word_nodes[#word_nodes+1] = item

      &% Ignore leading unrecognized nodes, too.
      elseif word_string ~= '' then
        word_string = word_string .. Babel.us_char   
        word_nodes[#word_nodes+1] = item  &% Will be ignored
      end

      item = item.next
    end

    &% Here and above we remove some trailing chars but not the
    &% corresponding nodes. But they aren't accessed. 
    if word_string:sub(-1) == ' ' then
      word_string = word_string:sub(1,-2)
    end
    word_string = unicode.utf8.gsub(word_string, Babel.us_char .. '+$', '')
    return word_string, word_nodes, item, lang
  end

  Babel.fetch_subtext[1] = function(head)
    local word_string = ''
    local word_nodes = {}
    local lang
    local item = head
    local inmath = false

    while item do

      if item.id == 11 then
        inmath = (item.subtype == 0)
      end

      if inmath then
        &% pass

      elseif item.id == 29 then
        if item.lang == lang or lang == nil then
          if (item.char ~= 124) and (item.char ~= 61) then &% not =, not |
            lang = lang or item.lang
            word_string = word_string .. unicode.utf8.char(item.char)
            word_nodes[#word_nodes+1] = item
          end
        else
          break
        end

      elseif item.id == 7 and item.subtype == 2 then
        word_string = word_string .. '='
        word_nodes[#word_nodes+1] = item

      elseif item.id == 7 and item.subtype == 3 then
        word_string = word_string .. '|'       
        word_nodes[#word_nodes+1] = item

      &% (1) Go to next word if nothing was found, and (2) implictly
      &% remove leading USs.
      elseif word_string == '' then
        &% pass

      &% This is the responsible for splitting by words.
      elseif (item.id == 12 and item.subtype == 13) then
        break

      else 
        word_string = word_string .. Babel.us_char   
        word_nodes[#word_nodes+1] = item  &% Will be ignored
      end

      item = item.next
    end

    word_string = unicode.utf8.gsub(word_string, Babel.us_char .. '+$', '')
    return word_string, word_nodes, item, lang
  end

  function Babel.pre_hyphenate_replace(head)
    Babel.hyphenate_replace(head, 0)
  end

  function Babel.post_hyphenate_replace(head)
    Babel.hyphenate_replace(head, 1)
  end

  function Babel.debug_hyph(w, wn, sc, first, last, last_match)
    local ss = ''
    for pp = 1, 40 do
      if wn[pp] then
        if wn[pp].id == 29 then
          ss = ss .. unicode.utf8.char(wn[pp].char)
        else
          ss = ss .. '{' .. wn[pp].id .. '}'
        end
      end
    end
    print('nod', ss)
    print('lst_m',
      string.rep(' ', unicode.utf8.len(
         string.sub(w, 1, last_match))-1) .. '>')
    print('str', w)
    print('sc', string.rep(' ', sc-1) .. '^')
    if first == last then
      print('f=l', string.rep(' ', first-1) .. '!')
    else
      print('f/l', string.rep(' ', first-1) .. '[' ..
        string.rep(' ', last-first-1) .. ']')
    end
  end

  Babel.us_char = string.char(31)

  function Babel.hyphenate_replace(head, mode)
    local u = unicode.utf8
    local lbkr = Babel.linebreaking.replacements[mode]

    local word_head = head

    while true do  &% for each subtext block

      local w, w_nodes, nw, lang = Babel.fetch_subtext[mode](word_head)

      if Babel.debug then
        print()
        print((mode == 0) and '@@@@<' or '@@@@>', w)
      end

      if nw == nil and w == '' then break end

      if not lang then goto next end
      if not lbkr[lang] then goto next end

      &% For each saved (pre|post)hyphenation. TODO. Reconsider how
      &% loops are nested.
      for k=1, #lbkr[lang] do
        local p = lbkr[lang][k].pattern
        local r = lbkr[lang][k].replace

        if Babel.debug then
          print('*****', p, mode)
        end

        &% This variable is set in some cases below to the first *byte*
        &% after the match, either as found by u.match (faster) or the
        &% computed position based on sc if w has changed.
        local last_match = 0
        local step = 0

        &% For every match.
        while true do
          if Babel.debug then
            print('=====')
          end
          local new  &% used when inserting and removing nodes

          local matches = { u.match(w, p, last_match) }
          
          if #matches < 2 then break end

          &% Get and remove empty captures (with ()'s, which return a
          &% number with the position), and keep actual captures
          &% (from (...)), if any, in matches.
          local first = table.remove(matches, 1)
          local last  = table.remove(matches, #matches)
          &% Non re-fetched substrings may contain \31, which separates
          &% subsubstrings.
          if string.find(w:sub(first, last-1), Babel.us_char) then break end

          local save_last = last &% with A()BC()D, points to D

          &% Fix offsets, from bytes to unicode. Explained above.
          first = u.len(w:sub(1, first-1)) + 1
          last  = u.len(w:sub(1, last-1)) &% now last points to C

          &% This loop stores in n small table the nodes
          &% corresponding to the pattern. Used by 'data' to provide a
          &% predictable behavior with 'insert' (now w_nodes is modified on
          &% the fly), and also access to 'remove'd nodes.
          local sc = first-1           &% Used below, too
          local data_nodes = {}

          for q = 1, last-first+1 do
            data_nodes[q] = w_nodes[sc+q]
          end

          &% This loop traverses the matched substring and takes the
          &% corresponding action stored in the replacement list.
          &% sc = the position in substr nodes / string
          &% rc = the replacement table index
          local rc = 0

          while rc < last-first+1 do &% for each replacement
            if Babel.debug then
              print('.....', rc + 1)
            end
            sc = sc + 1
            rc = rc + 1

            if Babel.debug then
              Babel.debug_hyph(w, w_nodes, sc, first, last, last_match)
              local ss = ''
              for itt in node.traverse(head) do
               if itt.id == 29 then
                 ss = ss .. unicode.utf8.char(itt.char)
               else
                 ss = ss .. '{' .. itt.id .. '}'
               end
              end
              print('*****************', ss)

            end

            local crep = r[rc]
            local item = w_nodes[sc]
            local item_base = item
            local placeholder = Babel.us_char
            local d

            if crep and crep.data then
              item_base = data_nodes[crep.data]
            end
            
            if crep then
              step = crep.step or 0
            end

            if crep and next(crep) == nil then &% = {}
              last_match = save_last    &% Optimization
              goto next

            elseif crep == nil or crep.remove then
              node.remove(head, item)
              table.remove(w_nodes, sc)
              w = u.sub(w, 1, sc-1) .. u.sub(w, sc+1)
              sc = sc - 1  &% Nothing has been inserted.
              last_match = utf8.offset(w, sc+1+step)
              goto next

            elseif crep and crep.kashida then &% Experimental
              node.set_attribute(item,
                 luatexbase.registernumber'bblar@kashida', 
                 crep.kashida)
              last_match = utf8.offset(w, sc+1+step)
              goto next

            elseif crep and crep.string then
              local str = crep.string(matches)
              if str == '' then  &% Gather with nil
                node.remove(head, item)
                table.remove(w_nodes, sc)
                w = u.sub(w, 1, sc-1) .. u.sub(w, sc+1)
                sc = sc - 1  &% Nothing has been inserted.
              else
                local loop_first = true
                for s in string.utfvalues(str) do
                  d = node.copy(item_base)
                  d.char = s
                  if loop_first then
                    loop_first = false
                    head, new = node.insert_before(head, item, d)
                    if sc == 1 then
                      word_head = head
                    end
                    w_nodes[sc] = d
                    w = u.sub(w, 1, sc-1) .. u.char(s) .. u.sub(w, sc+1)
                  else
                    sc = sc + 1
                    head, new = node.insert_before(head, item, d)
                    table.insert(w_nodes, sc, new)
                    w = u.sub(w, 1, sc-1) .. u.char(s) .. u.sub(w, sc)
                  end
                  if Babel.debug then
                    print('.....', 'str')
                    Babel.debug_hyph(w, w_nodes, sc, first, last, last_match)
                  end
                end  &% for
                node.remove(head, item)
              end  &% if ''
              last_match = utf8.offset(w, sc+1+step)
              goto next

            elseif mode == 1 and crep and (crep.pre or crep.no or crep.post) then
              d = node.new(7, 0)   &% (disc, discretionary)
              d.pre     = Babel.str_to_nodes(crep.pre, matches, item_base)
              d.post    = Babel.str_to_nodes(crep.post, matches, item_base)
              d.replace = Babel.str_to_nodes(crep.no, matches, item_base)
              d.attr = item_base.attr
              if crep.pre == nil then  &% TeXbook p96
                d.penalty = crep.penalty or tex.hyphenpenalty
              else
                d.penalty = crep.penalty or tex.exhyphenpenalty
              end
              placeholder = '|'
              head, new = node.insert_before(head, item, d)

            elseif mode == 0 and crep and (crep.pre or crep.no or crep.post) then
              &% ERROR

            elseif crep and crep.penalty then
              d = node.new(14, 0)   &% (penalty, userpenalty)
              d.attr = item_base.attr
              d.penalty = crep.penalty
              head, new = node.insert_before(head, item, d)

            elseif crep and crep.space then
              &% 655360 = 10 pt = 10 * 65536 sp
              d = node.new(12, 13)      &% (glue, spaceskip)
              local quad = font.getfont(item_base.font).size or 655360
              node.setglue(d, crep.space[1] * quad,
                              crep.space[2] * quad,
                              crep.space[3] * quad)
              if mode == 0 then
                placeholder = ' '
              end
              head, new = node.insert_before(head, item, d)

            elseif crep and crep.spacefactor then
              d = node.new(12, 13)      &% (glue, spaceskip)
              local base_font = font.getfont(item_base.font)
              node.setglue(d,
                crep.spacefactor[1] * base_font.parameters['space'],
                crep.spacefactor[2] * base_font.parameters['space_stretch'],
                crep.spacefactor[3] * base_font.parameters['space_shrink'])
              if mode == 0 then
                placeholder = ' '
              end
              head, new = node.insert_before(head, item, d)

            elseif mode == 0 and crep and crep.space then
              &% ERROR

            end  &% ie replacement cases

            &% Shared by disc, space and penalty.
            if sc == 1 then
              word_head = head
            end
            if crep.insert then
              w = u.sub(w, 1, sc-1) .. placeholder .. u.sub(w, sc)
              table.insert(w_nodes, sc, new)
              last = last + 1
            else
              w_nodes[sc] = d
              node.remove(head, item)
              w = u.sub(w, 1, sc-1) .. placeholder .. u.sub(w, sc+1)
            end

            last_match = utf8.offset(w, sc+1+step)

            ::next::

          end  &% for each replacement

          if Babel.debug then
              print('.....', '/')
              Babel.debug_hyph(w, w_nodes, sc, first, last, last_match)
          end

        end  &% for match

      end  &% for patterns

      ::next::
      word_head = nw
    end  &% for substring
    return head
  end

  &% This table stores capture maps, numbered consecutively
  Babel.capture_maps = {}

  &% The following functions belong to the next macro
  function Babel.capture_func(key, cap)
    local ret = "[[" .. cap:gsub('{([0-9])}', "]]..m[%1]..[[") .. "]]"
    local cnt
    local u = unicode.utf8
    ret, cnt = ret:gsub('{([0-9])|([^|]+)|(.-)}', Babel.capture_func_map)
    if cnt == 0 then
      ret = u.gsub(ret, '{(%x%x%x%x+)}', 
            function (n)
              return u.char(tonumber(n, 16))
            end)
    end
    ret = ret:gsub("%[%[%]%]%.%.", '')
    ret = ret:gsub("%.%.%[%[%]%]", '')
    return key .. [[=function(m) return ]] .. ret .. [[ end]]
  end

  function Babel.capt_map(from, mapno)
    return Babel.capture_maps[mapno][from] or from
  end

  &% Handle the {n|abc|ABC} syntax in captures
  function Babel.capture_func_map(capno, from, to)
    local u = unicode.utf8
    from = u.gsub(from, '{(%x%x%x%x+)}', 
         function (n)
           return u.char(tonumber(n, 16))
         end)
    to = u.gsub(to, '{(%x%x%x%x+)}', 
         function (n)
           return u.char(tonumber(n, 16))
         end)
    local froms = {}
    for s in string.utfcharacters(from) do
      table.insert(froms, s)
    end
    local cnt = 1
    table.insert(Babel.capture_maps, {})
    local mlen = table.getn(Babel.capture_maps)
    for s in string.utfcharacters(to) do
      Babel.capture_maps[mlen][froms[cnt]] = s
      cnt = cnt + 1
    end
    return "]]..Babel.capt_map(m[" .. capno .. "]," ..
           (mlen) .. ").." .. "[["
  end
  
  &% Create/Extend reversed sorted list of kashida weights:
  function Babel.capture_kashida(key, wt)
    wt = tonumber(wt)
    if Babel.kashida_wts then
      for p, q in ipairs(Babel.kashida_wts) do
        if wt  == q then
          break
        elseif wt > q then
          table.insert(Babel.kashida_wts, p, wt)
          break
        elseif table.getn(Babel.kashida_wts) == p then
          table.insert(Babel.kashida_wts, wt)
        end
      end
    else
      Babel.kashida_wts = { wt }
    end
    return 'kashida = ' .. wt
  end
}
%    \end{macrocode}
%
% Now the \TeX{} high level interface, which requires the function
% defined above for converting strings to functions returning a string.
% These functions handle the |{|\textit{n}|}| syntax. For example,
% |pre={1}{1}-| becomes |function(m) return m[1]..m[1]..'-' end|, where
% |m| are the matches returned after applying the pattern. With a
% mapped capture the functions are similar to
% |function(m) return Babel.capt_map(m[1],1) end|, where the last
% argument identifies the mapping to be applied to |m[1]|. The way it
% is carried out is somewhat tricky, but the effect in not dissimilar
% to lua |load| – save the code as string in a TeX macro, and expand
% this macro at the appropriate place. As |\directlua| does not take
% into account the current catcode of |@|, we just avoid this character
% in macro names (which explains the internal group, too).
% 
%    \begin{macrocode}
\catcode`\#=6
\gdef\babelposthyphenation#1#2#3{&%
  \bbl@activateposthyphen
  \begingroup
    \def\babeltempa{\bbl@add@list\babeltempb}&%
    \let\babeltempb\@empty
    \def\bbl@tempa{#3}&% TODO. Ugly trick to preserve {}:
    \bbl@replace\bbl@tempa{,}{ ,}&%
    \expandafter\bbl@foreach\expandafter{\bbl@tempa}{&%
      \bbl@ifsamestring{##1}{remove}&%
        {\bbl@add@list\babeltempb{nil}}&%
        {\directlua{
           local rep = [=[##1]=]             
           rep = rep:gsub('^%s*(remove)%s*$', 'remove = true')
           rep = rep:gsub('^%s*(insert)%s*,', 'insert = true, ')
           rep = rep:gsub(    '(no)%s*=%s*([^%s,]*)', Babel.capture_func)
           rep = rep:gsub(   '(pre)%s*=%s*([^%s,]*)', Babel.capture_func)
           rep = rep:gsub(  '(post)%s*=%s*([^%s,]*)', Babel.capture_func)
           rep = rep:gsub('(string)%s*=%s*([^%s,]*)', Babel.capture_func)          
           tex.print([[\string\babeltempa{{]] .. rep .. [[}}]])
         }}}&%
    \directlua{
      local lbkr = Babel.linebreaking.replacements[1]
      local u = unicode.utf8
      local id = \the\csname l@#1\endcsname
      &% Convert pattern:
      local patt = string.gsub([==[#2]==], '%s', '')
      if not u.find(patt, '()', nil, true) then
        patt = '()' .. patt .. '()'
      end
      patt = string.gsub(patt, '%(%)%^', '^()')
      patt = string.gsub(patt, '%$%(%)', '()$')
      patt = u.gsub(patt, '{(.)}', 
             function (n)
               return '%' .. (tonumber(n) and (tonumber(n)+1) or n)
             end)
      patt = u.gsub(patt, '{(%x%x%x%x+)}', 
             function (n)
               return u.gsub(u.char(tonumber(n, 16)), '(%p)', '%%%1')
             end)
      lbkr[id] = lbkr[id] or {}
      table.insert(lbkr[id], { pattern = patt, replace = { \babeltempb } })
    }&%
  \endgroup}
% TODO. Copypaste pattern. 
\gdef\babelprehyphenation#1#2#3{&%
  \bbl@activateprehyphen
  \begingroup
    \def\babeltempa{\bbl@add@list\babeltempb}&%
    \let\babeltempb\@empty
    \def\bbl@tempa{#3}&% TODO. Ugly trick to preserve {}:
    \bbl@replace\bbl@tempa{,}{ ,}&%
    \expandafter\bbl@foreach\expandafter{\bbl@tempa}{&%
      \bbl@ifsamestring{##1}{remove}&%
        {\bbl@add@list\babeltempb{nil}}&%
        {\directlua{
           local rep = [=[##1]=]
           rep = rep:gsub('^%s*(remove)%s*$', 'remove = true')
           rep = rep:gsub('^%s*(insert)%s*,', 'insert = true, ')
           rep = rep:gsub('(string)%s*=%s*([^%s,]*)', Babel.capture_func)
           rep = rep:gsub('(space)%s*=%s*([%d%.]+)%s+([%d%.]+)%s+([%d%.]+)',
             'space = {' .. '%2, %3, %4' .. '}')
           rep = rep:gsub('(spacefactor)%s*=%s*([%d%.]+)%s+([%d%.]+)%s+([%d%.]+)',
             'spacefactor = {' .. '%2, %3, %4' .. '}')
           rep = rep:gsub('(kashida)%s*=%s*([^%s,]*)', Babel.capture_kashida)
           tex.print([[\string\babeltempa{{]] .. rep .. [[}}]])
         }}}&%
    \directlua{
      local lbkr = Babel.linebreaking.replacements[0]
      local u = unicode.utf8
      local id = \the\csname bbl@id@@#1\endcsname
      &% Convert pattern:
      local patt = string.gsub([==[#2]==], '%s', '')
      local patt = string.gsub(patt, '|', ' ')
      if not u.find(patt, '()', nil, true) then
        patt = '()' .. patt .. '()'
      end     
      &% patt = string.gsub(patt, '%(%)%^', '^()')
      &% patt = string.gsub(patt, '([^%%])%$%(%)', '%1()$')
      patt = u.gsub(patt, '{(.)}', 
             function (n)
               return '%' .. (tonumber(n) and (tonumber(n)+1) or n)
             end)
      patt = u.gsub(patt, '{(%x%x%x%x+)}', 
             function (n)
               return u.gsub(u.char(tonumber(n, 16)), '(%p)', '%%%1')
             end)
      lbkr[id] = lbkr[id] or {}
      table.insert(lbkr[id], { pattern = patt, replace = { \babeltempb } })
    }&%    
  \endgroup}
\endgroup
\def\bbl@activateposthyphen{%
  \let\bbl@activateposthyphen\relax
  \directlua{
    Babel.linebreaking.add_after(Babel.post_hyphenate_replace)
  }}
\def\bbl@activateprehyphen{%
  \let\bbl@activateprehyphen\relax
  \directlua{
    Babel.linebreaking.add_before(Babel.pre_hyphenate_replace)
  }}
%    \end{macrocode}
%
% \subsection{Layout}
%
% Unlike \xetex{}, \luatex{} requires only minimal changes for
% right-to-left layouts, particularly in monolingual documents (the
% engine itself reverses boxes -- including column order or headings
% --, margins, etc.) with |bidi=basic|, without having to patch
% almost any macro where text direction is relevant.
%
% |\@hangfrom| is useful in many contexts and it is redefined always
% with the |layout| option.
%
% There are, however, a number of issues when the text direction is not
% the same as the box direction (as set by |\bodydir|), and when
% |\parbox| and |\hangindent| are involved. Fortunately, latest
% releases of \luatex{} simplify a lot the solution with |\shapemode|.
%
% With the issue \#15 I realized commands are best patched, instead of
% redefined. With a few lines, a modification could be applied to
% several classes and packages. Now, |tabular| seems to work (at least
% in simple cases) with \textsf{array}, \textsf{tabularx},
% \textsf{hhline}, \textsf{colortbl}, \textsf{longtable},
% \textsf{booktabs}, etc. However, \textsf{dcolumn} still fails.
%
%    \begin{macrocode}
\bbl@trace{Redefinitions for bidi layout}
\ifx\@eqnnum\@undefined\else
  \ifx\bbl@attr@dir\@undefined\else
    \edef\@eqnnum{{%
      \unexpanded{\ifcase\bbl@attr@dir\else\bbl@textdir\@ne\fi}%
      \unexpanded\expandafter{\@eqnnum}}}
  \fi
\fi
\ifx\bbl@opt@layout\@nnil\endinput\fi  % if no layout
\ifnum\bbl@bidimode>\z@
  \def\bbl@nextfake#1{%  non-local changes, use always inside a group!
    \bbl@exp{%
      \mathdir\the\bodydir  
      #1%              Once entered in math, set boxes to restore values
      \<ifmmode>%
        \everyvbox{%
          \the\everyvbox
          \bodydir\the\bodydir
          \mathdir\the\mathdir
          \everyhbox{\the\everyhbox}%
          \everyvbox{\the\everyvbox}}%
        \everyhbox{%
          \the\everyhbox
          \bodydir\the\bodydir
          \mathdir\the\mathdir
          \everyhbox{\the\everyhbox}%
          \everyvbox{\the\everyvbox}}%
      \<fi>}}%
  \def\@hangfrom#1{%
    \setbox\@tempboxa\hbox{{#1}}%
    \hangindent\wd\@tempboxa
    \ifnum\bbl@getluadir{page}=\bbl@getluadir{par}\else
      \shapemode\@ne
    \fi
    \noindent\box\@tempboxa}
\fi
\IfBabelLayout{tabular}
  {\let\bbl@OL@@tabular\@tabular
   \bbl@replace\@tabular{$}{\bbl@nextfake$}%
   \let\bbl@NL@@tabular\@tabular
   \AtBeginDocument{%
     \ifx\bbl@NL@@tabular\@tabular\else
       \bbl@replace\@tabular{$}{\bbl@nextfake$}%
       \let\bbl@NL@@tabular\@tabular
     \fi}}
   {}
\IfBabelLayout{lists}
  {\let\bbl@OL@list\list
   \bbl@sreplace\list{\parshape}{\bbl@listparshape}%
   \let\bbl@NL@list\list
   \def\bbl@listparshape#1#2#3{%
     \parshape #1 #2 #3 %
     \ifnum\bbl@getluadir{page}=\bbl@getluadir{par}\else
       \shapemode\tw@
     \fi}}
  {}
\IfBabelLayout{graphics}
  {\let\bbl@pictresetdir\relax
   \def\bbl@pictsetdir#1{%
     \ifcase\bbl@thetextdir
       \let\bbl@pictresetdir\relax
     \else
       \ifcase#1\bodydir TLT  % Remember this sets the inner boxes
         \or\textdir TLT
         \else\bodydir TLT \textdir TLT
       \fi
       % \(text|par)dir required in pgf:
       \def\bbl@pictresetdir{\bodydir TRT\pardir TRT\textdir TRT\relax}%
     \fi}%
   \ifx\AddToHook\@undefined\else
     \AddToHook{env/picture/begin}{\bbl@pictsetdir\tw@}%
     \directlua{
       Babel.get_picture_dir = true
       Babel.picture_has_bidi = 0
       function Babel.picture_dir (head)
         if not Babel.get_picture_dir then return head end
         for item in node.traverse(head) do
           if item.id == node.id'glyph' then
             local itemchar = item.char
             % TODO. Copypaste pattern from Babel.bidi (-r)
             local chardata = Babel.characters[itemchar]
             local dir = chardata and chardata.d or nil
             if not dir then
               for nn, et in ipairs(Babel.ranges) do
                 if itemchar < et[1] then
                   break
                 elseif itemchar <= et[2] then
                   dir = et[3]
                   break
                 end
               end
             end
             if dir and (dir == 'al' or dir == 'r') then
               Babel.picture_has_bidi = 1
             end
           end
         end
         return head
       end
       luatexbase.add_to_callback("hpack_filter", Babel.picture_dir,
         "Babel.picture_dir")
     }%
   \AtBeginDocument{%
     \long\def\put(#1,#2)#3{%
       \@killglue 
       % Try:
       \ifx\bbl@pictresetdir\relax
         \def\bbl@tempc{0}%
       \else
         \directlua{
           Babel.get_picture_dir = true
           Babel.picture_has_bidi = 0
         }%
         \setbox\z@\hb@xt@\z@{%
           \@defaultunitsset\@tempdimc{#1}\unitlength
           \kern\@tempdimc
           #3\hss}%
         \edef\bbl@tempc{\directlua{tex.print(Babel.picture_has_bidi)}}%
       \fi
       % Do:
       \@defaultunitsset\@tempdimc{#2}\unitlength
       \raise\@tempdimc\hb@xt@\z@{%
         \@defaultunitsset\@tempdimc{#1}\unitlength
         \kern\@tempdimc
         {\ifnum\bbl@tempc>\z@\bbl@pictresetdir\fi#3}\hss}% 
       \ignorespaces}%
       \MakeRobust\put}%
   \fi
   \AtBeginDocument
     {\ifx\tikz@atbegin@node\@undefined\else
        \ifx\AddToHook\@undefined\else % TODO. Still tentative.
          \AddToHook{env/pgfpicture/begin}{\bbl@pictsetdir\@ne}%
          \bbl@add\pgfinterruptpicture{\bbl@pictresetdir}%
        \fi
        \let\bbl@OL@pgfpicture\pgfpicture
        \bbl@sreplace\pgfpicture{\pgfpicturetrue}%
          {\bbl@pictsetdir\z@\pgfpicturetrue}%
        \bbl@add\pgfsys@beginpicture{\bbl@pictsetdir\z@}%
        \bbl@add\tikz@atbegin@node{\bbl@pictresetdir}%
        \bbl@sreplace\tikz{\begingroup}%
          {\begingroup\bbl@pictsetdir\tw@}%
      \fi
      \ifx\AddToHook\@undefined\else
        \AddToHook{env/tcolorbox/begin}{\bbl@pictsetdir\@ne}%
      \fi
      }}
  {}
%    \end{macrocode}
%
%      Implicitly reverses sectioning labels in bidi=basic-r, because
%      the full stop is not in contact with L numbers any more. I
%      think there must be a better way. Assumes |bidi=basic|, but
%      there are some additional readjustments for |bidi=default|.
%
%    \begin{macrocode}
\IfBabelLayout{counters}%
  {\let\bbl@OL@@textsuperscript\@textsuperscript
   \bbl@sreplace\@textsuperscript{\m@th}{\m@th\mathdir\pagedir}%
   \let\bbl@latinarabic=\@arabic
   \let\bbl@OL@@arabic\@arabic
   \def\@arabic#1{\babelsublr{\bbl@latinarabic#1}}%
   \@ifpackagewith{babel}{bidi=default}%
     {\let\bbl@asciiroman=\@roman
      \let\bbl@OL@@roman\@roman
      \def\@roman#1{\babelsublr{\ensureascii{\bbl@asciiroman#1}}}%
      \let\bbl@asciiRoman=\@Roman
      \let\bbl@OL@@roman\@Roman
      \def\@Roman#1{\babelsublr{\ensureascii{\bbl@asciiRoman#1}}}%
      \let\bbl@OL@labelenumii\labelenumii
      \def\labelenumii{)\theenumii(}%
      \let\bbl@OL@p@enumiii\p@enumiii
      \def\p@enumiii{\p@enumii)\theenumii(}}{}}{}
<@Footnote changes@>
\IfBabelLayout{footnotes}%
  {\let\bbl@OL@footnote\footnote
   \BabelFootnote\footnote\languagename{}{}%
   \BabelFootnote\localfootnote\languagename{}{}%
   \BabelFootnote\mainfootnote{}{}{}}
  {}
%    \end{macrocode}
%
% Some \LaTeX{} macros use internally the math mode for text
% formatting. They have very little in common and are grouped here, as
% a single option.
%
%    \begin{macrocode}
\IfBabelLayout{extras}%
  {\let\bbl@OL@underline\underline
   \bbl@sreplace\underline{$\@@underline}{\bbl@nextfake$\@@underline}%
   \let\bbl@OL@LaTeX2e\LaTeX2e
   \DeclareRobustCommand{\LaTeXe}{\mbox{\m@th
     \if b\expandafter\@car\f@series\@nil\boldmath\fi
     \babelsublr{%
       \LaTeX\kern.15em2\bbl@nextfake$_{\textstyle\varepsilon}$}}}}
  {}
%</luatex>
%    \end{macrocode}
%
% \subsection{Auto bidi with \texttt{basic} and \texttt{basic-r}}
%
% The file \textsf{babel-data-bidi.lua} currently only contains data. It is
% a large and boring file and it is not shown here (see the generated file),
% but here is a sample:
%\begin{verbatim}
% [0x25]={d='et'},
% [0x26]={d='on'},
% [0x27]={d='on'},
% [0x28]={d='on', m=0x29},
% [0x29]={d='on', m=0x28},
% [0x2A]={d='on'},
% [0x2B]={d='es'},
% [0x2C]={d='cs'},
%\end{verbatim}
% For the meaning of these codes, see the Unicode standard.
%
%\iffalse
%    \begin{macrocode}
%<*bididata>
-- Data from Unicode and ConTeXt

Babel = Babel or {}

Babel.ranges={
 {0x0590, 0x05FF, 'r'},
 {0x0600, 0x07BF, 'al'},
 {0x07C0, 0x085F, 'r'},
 {0x0860, 0x086F, 'al'},
 {0x08A0, 0x08FF, 'al'},
 {0xE000, 0xF8FF, 'on'}, -- PUA
 {0xFB1D, 0xFB4F, 'r'},
 {0xFB50, 0xFDFF, 'al'},
 {0xFE70, 0xFEFF, 'al'},
 {0x10800, 0x10C4F, 'r'},
 {0x1E800, 0x1E8DF, 'r'},
 {0x1E900, 0x1E95F, 'r'},
 {0x1F300, 0x1F9FF, 'on'},
 {0xF0000, 0xFFFFD, 'on'}, -- PUA
 {0x100000, 0x10FFFD, 'on'} -- PUA
}

Babel.characters={
 [0x0]={d='bn'},
 [0x1]={d='bn'},
 [0x2]={d='bn'},
 [0x3]={d='bn'},
 [0x4]={d='bn'},
 [0x5]={d='bn'},
 [0x6]={d='bn'},
 [0x7]={d='bn'},
 [0x8]={d='bn'},
 [0x9]={d='s'},
 [0xA]={d='b'},
 [0xB]={d='s'},
 [0xC]={d='ws'},
 [0xD]={d='b'},
 [0xE]={d='bn'},
 [0xF]={d='bn'},
 [0x10]={d='bn'},
 [0x11]={d='bn'},
 [0x12]={d='bn'},
 [0x13]={d='bn'},
 [0x14]={d='bn'},
 [0x15]={d='bn'},
 [0x16]={d='bn'},
 [0x17]={d='bn'},
 [0x18]={d='bn'},
 [0x19]={d='bn'},
 [0x1A]={d='bn'},
 [0x1B]={d='bn'},
 [0x1C]={d='b'},
 [0x1D]={d='b'},
 [0x1E]={d='b'},
 [0x1F]={d='s'},
 [0x20]={d='ws'},
 [0x21]={d='on'},
 [0x22]={d='on'},
 [0x23]={d='et'},
 [0x24]={d='et'},
 [0x25]={d='et'},
 [0x26]={d='on'},
 [0x27]={d='on'},
 [0x28]={d='on', m=0x29},
 [0x29]={d='on', m=0x28},
 [0x2A]={d='on'},
 [0x2B]={d='es'},
 [0x2C]={d='cs'},
 [0x2D]={d='es'},
 [0x2E]={d='cs'},
 [0x2F]={d='cs'},
 [0x30]={d='en'},
 [0x31]={d='en'},
 [0x32]={d='en'},
 [0x33]={d='en'},
 [0x34]={d='en'},
 [0x35]={d='en'},
 [0x36]={d='en'},
 [0x37]={d='en'},
 [0x38]={d='en'},
 [0x39]={d='en'},
 [0x3A]={d='cs'},
 [0x3B]={d='on'},
 [0x3C]={d='on', m=0x3E},
 [0x3D]={d='on'},
 [0x3E]={d='on', m=0x3C},
 [0x3F]={d='on'},
 [0x40]={d='on'},
 [0x5B]={d='on', m=0x5D},
 [0x5C]={d='on'},
 [0x5D]={d='on', m=0x5B},
 [0x5E]={d='on'},
 [0x5F]={d='on'},
 [0x60]={d='on'},
 [0x7B]={d='on', m=0x7D},
 [0x7C]={d='on'},
 [0x7D]={d='on', m=0x7B},
 [0x7E]={d='on'},
 [0x7F]={d='bn'},
 [0x80]={d='bn'},
 [0x81]={d='bn'},
 [0x82]={d='bn'},
 [0x83]={d='bn'},
 [0x84]={d='bn'},
 [0x85]={d='b'},
 [0x86]={d='bn'},
 [0x87]={d='bn'},
 [0x88]={d='bn'},
 [0x89]={d='bn'},
 [0x8A]={d='bn'},
 [0x8B]={d='bn'},
 [0x8C]={d='bn'},
 [0x8D]={d='bn'},
 [0x8E]={d='bn'},
 [0x8F]={d='bn'},
 [0x90]={d='bn'},
 [0x91]={d='bn'},
 [0x92]={d='bn'},
 [0x93]={d='bn'},
 [0x94]={d='bn'},
 [0x95]={d='bn'},
 [0x96]={d='bn'},
 [0x97]={d='bn'},
 [0x98]={d='bn'},
 [0x99]={d='bn'},
 [0x9A]={d='bn'},
 [0x9B]={d='bn'},
 [0x9C]={d='bn'},
 [0x9D]={d='bn'},
 [0x9E]={d='bn'},
 [0x9F]={d='bn'},
 [0xA0]={d='cs'},
 [0xA1]={d='on'},
 [0xA2]={d='et'},
 [0xA3]={d='et'},
 [0xA4]={d='et'},
 [0xA5]={d='et'},
 [0xA6]={d='on'},
 [0xA7]={d='on'},
 [0xA8]={d='on'},
 [0xA9]={d='on'},
 [0xAB]={d='on', m=0xBB},
 [0xAC]={d='on'},
 [0xAD]={d='bn'},
 [0xAE]={d='on'},
 [0xAF]={d='on'},
 [0xB0]={d='et'},
 [0xB1]={d='et'},
 [0xB2]={d='en'},
 [0xB3]={d='en'},
 [0xB4]={d='on'},
 [0xB6]={d='on'},
 [0xB7]={d='on'},
 [0xB8]={d='on'},
 [0xB9]={d='en'},
 [0xBB]={d='on', m=0xAB},
 [0xBC]={d='on'},
 [0xBD]={d='on'},
 [0xBE]={d='on'},
 [0xBF]={d='on'},
 [0xD7]={d='on'},
 [0xF7]={d='on'},
 [0x2B9]={d='on'},
 [0x2BA]={d='on'},
 [0x2C2]={d='on'},
 [0x2C3]={d='on'},
 [0x2C4]={d='on'},
 [0x2C5]={d='on'},
 [0x2C6]={d='on'},
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 [0x1F08D]={d='on'},
 [0x1F08E]={d='on'},
 [0x1F08F]={d='on'},
 [0x1F090]={d='on'},
 [0x1F091]={d='on'},
 [0x1F092]={d='on'},
 [0x1F093]={d='on'},
 [0x1F0A0]={d='on'},
 [0x1F0A1]={d='on'},
 [0x1F0A2]={d='on'},
 [0x1F0A3]={d='on'},
 [0x1F0A4]={d='on'},
 [0x1F0A5]={d='on'},
 [0x1F0A6]={d='on'},
 [0x1F0A7]={d='on'},
 [0x1F0A8]={d='on'},
 [0x1F0A9]={d='on'},
 [0x1F0AA]={d='on'},
 [0x1F0AB]={d='on'},
 [0x1F0AC]={d='on'},
 [0x1F0AD]={d='on'},
 [0x1F0AE]={d='on'},
 [0x1F0B1]={d='on'},
 [0x1F0B2]={d='on'},
 [0x1F0B3]={d='on'},
 [0x1F0B4]={d='on'},
 [0x1F0B5]={d='on'},
 [0x1F0B6]={d='on'},
 [0x1F0B7]={d='on'},
 [0x1F0B8]={d='on'},
 [0x1F0B9]={d='on'},
 [0x1F0BA]={d='on'},
 [0x1F0BB]={d='on'},
 [0x1F0BC]={d='on'},
 [0x1F0BD]={d='on'},
 [0x1F0BE]={d='on'},
 [0x1F0BF]={d='on'},
 [0x1F0C1]={d='on'},
 [0x1F0C2]={d='on'},
 [0x1F0C3]={d='on'},
 [0x1F0C4]={d='on'},
 [0x1F0C5]={d='on'},
 [0x1F0C6]={d='on'},
 [0x1F0C7]={d='on'},
 [0x1F0C8]={d='on'},
 [0x1F0C9]={d='on'},
 [0x1F0CA]={d='on'},
 [0x1F0CB]={d='on'},
 [0x1F0CC]={d='on'},
 [0x1F0CD]={d='on'},
 [0x1F0CE]={d='on'},
 [0x1F0CF]={d='on'},
 [0x1F0D1]={d='on'},
 [0x1F0D2]={d='on'},
 [0x1F0D3]={d='on'},
 [0x1F0D4]={d='on'},
 [0x1F0D5]={d='on'},
 [0x1F0D6]={d='on'},
 [0x1F0D7]={d='on'},
 [0x1F0D8]={d='on'},
 [0x1F0D9]={d='on'},
 [0x1F0DA]={d='on'},
 [0x1F0DB]={d='on'},
 [0x1F0DC]={d='on'},
 [0x1F0DD]={d='on'},
 [0x1F0DE]={d='on'},
 [0x1F0DF]={d='on'},
 [0x1F0E0]={d='on'},
 [0x1F0E1]={d='on'},
 [0x1F0E2]={d='on'},
 [0x1F0E3]={d='on'},
 [0x1F0E4]={d='on'},
 [0x1F0E5]={d='on'},
 [0x1F0E6]={d='on'},
 [0x1F0E7]={d='on'},
 [0x1F0E8]={d='on'},
 [0x1F0E9]={d='on'},
 [0x1F0EA]={d='on'},
 [0x1F0EB]={d='on'},
 [0x1F0EC]={d='on'},
 [0x1F0ED]={d='on'},
 [0x1F0EE]={d='on'},
 [0x1F0EF]={d='on'},
 [0x1F0F0]={d='on'},
 [0x1F0F1]={d='on'},
 [0x1F0F2]={d='on'},
 [0x1F0F3]={d='on'},
 [0x1F0F4]={d='on'},
 [0x1F0F5]={d='on'},
 [0x1F100]={d='en'},
 [0x1F101]={d='en'},
 [0x1F102]={d='en'},
 [0x1F103]={d='en'},
 [0x1F104]={d='en'},
 [0x1F105]={d='en'},
 [0x1F106]={d='en'},
 [0x1F107]={d='en'},
 [0x1F108]={d='en'},
 [0x1F109]={d='en'},
 [0x1F10A]={d='en'},
 [0x1F10B]={d='on'},
 [0x1F10C]={d='on'},
 [0x1F16A]={d='on'},
 [0x1F16B]={d='on'},
 [0xE0001]={d='bn'},
 [0xE0020]={d='bn'},
 [0xE0021]={d='bn'},
 [0xE0022]={d='bn'},
 [0xE0023]={d='bn'},
 [0xE0024]={d='bn'},
 [0xE0025]={d='bn'},
 [0xE0026]={d='bn'},
 [0xE0027]={d='bn'},
 [0xE0028]={d='bn'},
 [0xE0029]={d='bn'},
 [0xE002A]={d='bn'},
 [0xE002B]={d='bn'},
 [0xE002C]={d='bn'},
 [0xE002D]={d='bn'},
 [0xE002E]={d='bn'},
 [0xE002F]={d='bn'},
 [0xE0030]={d='bn'},
 [0xE0031]={d='bn'},
 [0xE0032]={d='bn'},
 [0xE0033]={d='bn'},
 [0xE0034]={d='bn'},
 [0xE0035]={d='bn'},
 [0xE0036]={d='bn'},
 [0xE0037]={d='bn'},
 [0xE0038]={d='bn'},
 [0xE0039]={d='bn'},
 [0xE003A]={d='bn'},
 [0xE003B]={d='bn'},
 [0xE003C]={d='bn'},
 [0xE003D]={d='bn'},
 [0xE003E]={d='bn'},
 [0xE003F]={d='bn'},
 [0xE0040]={d='bn'},
 [0xE0041]={d='bn'},
 [0xE0042]={d='bn'},
 [0xE0043]={d='bn'},
 [0xE0044]={d='bn'},
 [0xE0045]={d='bn'},
 [0xE0046]={d='bn'},
 [0xE0047]={d='bn'},
 [0xE0048]={d='bn'},
 [0xE0049]={d='bn'},
 [0xE004A]={d='bn'},
 [0xE004B]={d='bn'},
 [0xE004C]={d='bn'},
 [0xE004D]={d='bn'},
 [0xE004E]={d='bn'},
 [0xE004F]={d='bn'},
 [0xE0050]={d='bn'},
 [0xE0051]={d='bn'},
 [0xE0052]={d='bn'},
 [0xE0053]={d='bn'},
 [0xE0054]={d='bn'},
 [0xE0055]={d='bn'},
 [0xE0056]={d='bn'},
 [0xE0057]={d='bn'},
 [0xE0058]={d='bn'},
 [0xE0059]={d='bn'},
 [0xE005A]={d='bn'},
 [0xE005B]={d='bn'},
 [0xE005C]={d='bn'},
 [0xE005D]={d='bn'},
 [0xE005E]={d='bn'},
 [0xE005F]={d='bn'},
 [0xE0060]={d='bn'},
 [0xE0061]={d='bn'},
 [0xE0062]={d='bn'},
 [0xE0063]={d='bn'},
 [0xE0064]={d='bn'},
 [0xE0065]={d='bn'},
 [0xE0066]={d='bn'},
 [0xE0067]={d='bn'},
 [0xE0068]={d='bn'},
 [0xE0069]={d='bn'},
 [0xE006A]={d='bn'},
 [0xE006B]={d='bn'},
 [0xE006C]={d='bn'},
 [0xE006D]={d='bn'},
 [0xE006E]={d='bn'},
 [0xE006F]={d='bn'},
 [0xE0070]={d='bn'},
 [0xE0071]={d='bn'},
 [0xE0072]={d='bn'},
 [0xE0073]={d='bn'},
 [0xE0074]={d='bn'},
 [0xE0075]={d='bn'},
 [0xE0076]={d='bn'},
 [0xE0077]={d='bn'},
 [0xE0078]={d='bn'},
 [0xE0079]={d='bn'},
 [0xE007A]={d='bn'},
 [0xE007B]={d='bn'},
 [0xE007C]={d='bn'},
 [0xE007D]={d='bn'},
 [0xE007E]={d='bn'},
 [0xE007F]={d='bn'}
}
%</bididata>
%    \end{macrocode}
%\fi
%
% Now the |basic-r| bidi mode. One of the aims is to implement a fast
% and simple bidi algorithm, with a single loop. I managed to do it
% for R texts, with a second smaller loop for a special case. The code
% is still somewhat chaotic, but its behavior is essentially
% correct. I cannot resist copying the following text from
% \textsf{Emacs} |bidi.c| (which also attempts to implement the bidi
% algorithm with a single loop):
%
% \begin{quote}
%   Arrrgh!! The UAX\#9 algorithm is too deeply entrenched in the
%   assumption of batch-style processing [...]. May the fleas of a
%   thousand camels infest the armpits of those who design supposedly
%   general-purpose algorithms by looking at their own
%   implementations, and fail to consider other possible
%   implementations!
% \end{quote}
%
% Well, it took me some time to guess what the batch rules in UAX\#9
% actually mean (in other word, \textit{what} they do and \textit{why},
% and not only \textit{how}), but I think (or I hope) I've managed to
% understand them.
%
% In some sense, there are two bidi modes, one for numbers, and the
% other for text.  Furthermore, setting just the direction in R text
% is not enough, because there are actually \textit{two} R modes (set
% explicitly in Unicode with RLM and ALM). In \babel{} the dir is set
% by a higher protocol based on the language/script, which in turn
% sets the correct dir (<l>, <r> or <al>).
%
% From UAX\#9: “Where available, markup should be used instead of the
% explicit formatting characters”. So, this simple version just
% ignores formatting characters. Actually, most of that annex is
% devoted to how to handle them.
%
% BD14-BD16 are not implemented. Unicode (and the W3C) are making a
% great effort to deal with some special problematic cases in
% “streamed” plain text. I don't think this is the way to go --
% particular issues should be fixed by a high level interface taking
% into account the needs of the document. And here is where \luatex{}
% excels, because everything related to bidi writing is under our
% control.
%
%    \begin{macrocode}
%<*basic-r>
Babel = Babel or {}

Babel.bidi_enabled = true

require('babel-data-bidi.lua')

local characters = Babel.characters
local ranges = Babel.ranges

local DIR = node.id("dir")

local function dir_mark(head, from, to, outer)
  dir = (outer == 'r') and 'TLT' or 'TRT' -- ie, reverse
  local d = node.new(DIR)
  d.dir = '+' .. dir
  node.insert_before(head, from, d)
  d = node.new(DIR)
  d.dir = '-' .. dir
  node.insert_after(head, to, d)
end

function Babel.bidi(head, ispar)
  local first_n, last_n            -- first and last char with nums
  local last_es                    -- an auxiliary 'last' used with nums
  local first_d, last_d            -- first and last char in L/R block
  local dir, dir_real
%    \end{macrocode}
%
%   Next also depends on script/lang (<al>/<r>). To be set by
%   babel.  |tex.pardir| is dangerous, could be (re)set but it
%   should be changed only in vmode. There are two strong's --
%   |strong| = l/al/r and |strong_lr| = l/r (there must be a better
%   way):
%
%    \begin{macrocode}
  local strong = ('TRT' == tex.pardir) and 'r' or 'l'
  local strong_lr = (strong == 'l') and 'l' or 'r'
  local outer = strong

  local new_dir = false
  local first_dir = false
  local inmath = false

  local last_lr

  local type_n = ''

  for item in node.traverse(head) do

    -- three cases: glyph, dir, otherwise
    if item.id == node.id'glyph'
      or (item.id == 7 and item.subtype == 2) then

      local itemchar
      if item.id == 7 and item.subtype == 2 then
        itemchar = item.replace.char
      else
        itemchar = item.char
      end
      local chardata = characters[itemchar]
      dir = chardata and chardata.d or nil
      if not dir then
        for nn, et in ipairs(ranges) do
          if itemchar < et[1] then
            break
          elseif itemchar <= et[2] then
            dir = et[3]
            break
          end
        end
      end
      dir = dir or 'l'
      if inmath then dir = ('TRT' == tex.mathdir) and 'r' or 'l' end
%    \end{macrocode}
%
%      Next is based on the assumption babel sets the language AND
%      switches the script with its dir. We treat a language block as
%      a separate Unicode sequence. The following piece of code is
%      executed at the first glyph after a `dir' node. We don't know
%      the current language until then. This is not exactly true, as
%      the math mode may insert explicit dirs in the node list, so, for
%      the moment there is a hack by brute force (just above).
%
%    \begin{macrocode}
      if new_dir then
        attr_dir = 0
        for at in node.traverse(item.attr) do
          if at.number == luatexbase.registernumber'bbl@attr@dir' then
            attr_dir = at.value % 3
          end
        end
        if attr_dir == 1 then
          strong = 'r'
        elseif attr_dir == 2 then
          strong = 'al'
        else
          strong = 'l'
        end
        strong_lr = (strong == 'l') and 'l' or 'r'
        outer = strong_lr
        new_dir = false
      end

      if dir == 'nsm' then dir = strong end             -- W1
%    \end{macrocode}
%
% \textbf{Numbers.} The dual <al>/<r> system for R is somewhat
% cumbersome.
%
%    \begin{macrocode}
      dir_real = dir               -- We need dir_real to set strong below
      if dir == 'al' then dir = 'r' end -- W3
%    \end{macrocode}
%
% By W2, there are no <en> <et> <es> if |strong == <al>|, only
% <an>. Therefore, there are not <et en> nor <en et>, W5 can be
% ignored, and W6 applied:
%
%    \begin{macrocode}
      if strong == 'al' then
        if dir == 'en' then dir = 'an' end                -- W2
        if dir == 'et' or dir == 'es' then dir = 'on' end -- W6
        strong_lr = 'r'                                   -- W3
      end
%    \end{macrocode}
%
% Once finished the basic setup for glyphs, consider the two other
% cases: dir node and the rest. 
%
%    \begin{macrocode}
    elseif item.id == node.id'dir' and not inmath then
      new_dir = true
      dir = nil
    elseif item.id == node.id'math' then
      inmath = (item.subtype == 0)
    else
      dir = nil          -- Not a char
    end
%    \end{macrocode}
%
% Numbers in R mode. A sequence of <en>, <et>, <an>, <es> and <cs> is
% typeset (with some rules) in L mode. We store the starting and
% ending points, and only when anything different is found (including
% nil, ie, a non-char), the textdir is set. This means you cannot
% insert, say, a whatsit, but this is what I would expect (with
% \textsf{luacolor} you may colorize some digits). Anyway, this
% behavior could be changed with a switch in the future.  Note in the
% first branch only <an> is relevant if <al>.
%
%    \begin{macrocode}
    if dir == 'en' or dir == 'an' or dir == 'et' then
      if dir ~= 'et' then
        type_n = dir
      end
      first_n = first_n or item
      last_n = last_es or item
      last_es = nil
    elseif dir == 'es' and last_n then -- W3+W6
      last_es = item
    elseif dir == 'cs' then            -- it's right - do nothing
    elseif first_n then -- & if dir = any but en, et, an, es, cs, inc nil
      if strong_lr == 'r' and type_n ~= '' then
        dir_mark(head, first_n, last_n, 'r')
      elseif strong_lr == 'l' and first_d and type_n == 'an' then
        dir_mark(head, first_n, last_n, 'r')
        dir_mark(head, first_d, last_d, outer)
        first_d, last_d = nil, nil
      elseif strong_lr == 'l' and type_n ~= '' then
        last_d = last_n
      end
      type_n = ''
      first_n, last_n = nil, nil
    end
%    \end{macrocode}
%
% R text in L, or L text in R. Order of |dir_ mark|'s are relevant: d
% goes outside n, and therefore it's emitted after. See |dir_mark| to
% understand why (but is the nesting actually necessary or is a flat
% dir structure enough?). Only L, R (and AL) chars are taken into
% account -- everything else, including spaces, whatsits, etc., are
% ignored:
%
%    \begin{macrocode}
    if dir == 'l' or dir == 'r' then
      if dir ~= outer then
        first_d = first_d or item
        last_d = item
      elseif first_d and dir ~= strong_lr then
        dir_mark(head, first_d, last_d, outer)
        first_d, last_d = nil, nil
     end
    end
%    \end{macrocode}
%
% \textbf{Mirroring.}  Each chunk of text in a certain language is
% considered a ``closed'' sequence.  If <r on r> and <l on l>, it's
% clearly <r> and <l>, resptly, but with other combinations depends on
% outer. From all these, we select only those resolving <on> $\to$
% <r>. At the beginning (when |last_lr| is nil) of an R text, they are
% mirrored directly.
%
% TODO - numbers in R mode are processed. It doesn't hurt, but should
% not be done.
%
%    \begin{macrocode}
    if dir and not last_lr and dir ~= 'l' and outer == 'r' then
      item.char = characters[item.char] and
                  characters[item.char].m or item.char
    elseif (dir or new_dir) and last_lr ~= item then
      local mir = outer .. strong_lr .. (dir or outer)
      if mir == 'rrr' or mir == 'lrr' or mir == 'rrl' or mir == 'rlr' then
        for ch in node.traverse(node.next(last_lr)) do
          if ch == item then break end
          if ch.id == node.id'glyph' and characters[ch.char] then
            ch.char = characters[ch.char].m or ch.char
          end
        end
      end
    end
%    \end{macrocode}
%
% Save some values for the next iteration. If the current node is
% `dir', open a new sequence. Since dir could be changed, strong is
% set with its real value (|dir_real|).
%
%    \begin{macrocode}
    if dir == 'l' or dir == 'r' then
      last_lr = item
      strong = dir_real            -- Don't search back - best save now
      strong_lr = (strong == 'l') and 'l' or 'r'
    elseif new_dir then
      last_lr = nil
    end
  end
%    \end{macrocode}
%
% Mirror the last chars if they are no directed. And make sure any
% open block is closed, too.
%
%    \begin{macrocode}
  if last_lr and outer == 'r' then
    for ch in node.traverse_id(node.id'glyph', node.next(last_lr)) do
      if characters[ch.char] then
        ch.char = characters[ch.char].m or ch.char
      end
    end
  end
  if first_n then
    dir_mark(head, first_n, last_n, outer)
  end
  if first_d then
    dir_mark(head, first_d, last_d, outer)
  end
%    \end{macrocode}
%
% In boxes, the dir node could be added before the original head, so
% the actual head is the previous node.
%
%    \begin{macrocode}
  return node.prev(head) or head
end
%</basic-r>
%    \end{macrocode}
%
% And here the Lua code for |bidi=basic|:
%
%    \begin{macrocode}
%<*basic>
Babel = Babel or {}

-- eg, Babel.fontmap[1][<prefontid>]=<dirfontid>

Babel.fontmap = Babel.fontmap or {}
Babel.fontmap[0] = {}      -- l
Babel.fontmap[1] = {}      -- r
Babel.fontmap[2] = {}      -- al/an

Babel.bidi_enabled = true
Babel.mirroring_enabled = true

require('babel-data-bidi.lua')

local characters = Babel.characters
local ranges = Babel.ranges

local DIR = node.id('dir')
local GLYPH = node.id('glyph')

local function insert_implicit(head, state, outer)
  local new_state = state
  if state.sim and state.eim and state.sim ~= state.eim then
    dir = ((outer == 'r') and 'TLT' or 'TRT') -- ie, reverse
    local d = node.new(DIR)
    d.dir = '+' .. dir
    node.insert_before(head, state.sim, d)
    local d = node.new(DIR)
    d.dir = '-' .. dir
    node.insert_after(head, state.eim, d)
  end
  new_state.sim, new_state.eim = nil, nil
  return head, new_state
end

local function insert_numeric(head, state)
  local new
  local new_state = state
  if state.san and state.ean and state.san ~= state.ean then
    local d = node.new(DIR)
    d.dir = '+TLT'
    _, new = node.insert_before(head, state.san, d)
    if state.san == state.sim then state.sim = new end
    local d = node.new(DIR)
    d.dir = '-TLT'
    _, new = node.insert_after(head, state.ean, d)
    if state.ean == state.eim then state.eim = new end
  end
  new_state.san, new_state.ean = nil, nil
  return head, new_state
end

-- TODO - \hbox with an explicit dir can lead to wrong results
-- <R \hbox dir TLT{<R>}> and <L \hbox dir TRT{<L>}>. A small attempt
-- was s made to improve the situation, but the problem is the 3-dir
-- model in babel/Unicode and the 2-dir model in LuaTeX don't fit
-- well.

function Babel.bidi(head, ispar, hdir)
  local d   -- d is used mainly for computations in a loop
  local prev_d = ''
  local new_d = false

  local nodes = {}
  local outer_first = nil
  local inmath = false

  local glue_d = nil
  local glue_i = nil

  local has_en = false
  local first_et = nil

  local ATDIR = luatexbase.registernumber'bbl@attr@dir'

  local save_outer
  local temp = node.get_attribute(head, ATDIR)
  if temp then
    temp = temp % 3
    save_outer = (temp == 0 and 'l') or
                 (temp == 1 and 'r') or
                 (temp == 2 and 'al')
  elseif ispar then            -- Or error? Shouldn't happen
    save_outer = ('TRT' == tex.pardir) and 'r' or 'l'
  else                         -- Or error? Shouldn't happen
    save_outer = ('TRT' == hdir) and 'r' or 'l'
  end
    -- when the callback is called, we are just _after_ the box,
    -- and the textdir is that of the surrounding text
  -- if not ispar and hdir ~= tex.textdir then 
  --   save_outer = ('TRT' == hdir) and 'r' or 'l'
  -- end
  local outer = save_outer
  local last = outer
  -- 'al' is only taken into account in the first, current loop
  if save_outer == 'al' then save_outer = 'r' end

  local fontmap = Babel.fontmap

  for item in node.traverse(head) do

    -- In what follows, #node is the last (previous) node, because the
    -- current one is not added until we start processing the neutrals.

    -- three cases: glyph, dir, otherwise
    if item.id == GLYPH
       or (item.id == 7 and item.subtype == 2) then

      local d_font = nil
      local item_r
      if item.id == 7 and item.subtype == 2 then
        item_r = item.replace    -- automatic discs have just 1 glyph
      else
        item_r = item
      end
      local chardata = characters[item_r.char]
      d = chardata and chardata.d or nil
      if not d or d == 'nsm' then
        for nn, et in ipairs(ranges) do
          if item_r.char < et[1] then
            break
          elseif item_r.char <= et[2] then
            if not d then d = et[3]
            elseif d == 'nsm' then d_font = et[3]
            end
            break
          end
        end
      end
      d = d or 'l'

      -- A short 'pause' in bidi for mapfont
      d_font = d_font or d
      d_font = (d_font == 'l' and 0) or
               (d_font == 'nsm' and 0) or
               (d_font == 'r' and 1) or
               (d_font == 'al' and 2) or
               (d_font == 'an' and 2) or nil
      if d_font and fontmap and fontmap[d_font][item_r.font] then
        item_r.font = fontmap[d_font][item_r.font]
      end

      if new_d then
        table.insert(nodes, {nil, (outer == 'l') and 'l' or 'r', nil})
        if inmath then
          attr_d = 0
        else
          attr_d = node.get_attribute(item, ATDIR)
          attr_d = attr_d % 3
        end
        if attr_d == 1 then
          outer_first = 'r'
          last = 'r'
        elseif attr_d == 2 then
          outer_first = 'r'
          last = 'al'
        else
          outer_first = 'l'
          last = 'l'
        end
        outer = last
        has_en = false
        first_et = nil
        new_d = false
      end

      if glue_d then
        if (d == 'l' and 'l' or 'r') ~= glue_d then
           table.insert(nodes, {glue_i, 'on', nil})
        end
        glue_d = nil
        glue_i = nil
      end

    elseif item.id == DIR then
      d = nil
      new_d = true

    elseif item.id == node.id'glue' and item.subtype == 13 then
      glue_d = d
      glue_i = item
      d = nil

    elseif item.id == node.id'math' then
      inmath = (item.subtype == 0)

    else
      d = nil
    end

    -- AL <= EN/ET/ES     -- W2 + W3 + W6
    if last == 'al' and d == 'en' then
      d = 'an'           -- W3
    elseif last == 'al' and (d == 'et' or d == 'es') then
      d = 'on'           -- W6
    end

    -- EN + CS/ES + EN     -- W4
    if d == 'en' and #nodes >= 2 then
      if (nodes[#nodes][2] == 'es' or nodes[#nodes][2] == 'cs')
          and nodes[#nodes-1][2] == 'en' then
        nodes[#nodes][2] = 'en'
      end
    end

    -- AN + CS + AN        -- W4 too, because uax9 mixes both cases
    if d == 'an' and #nodes >= 2 then
      if (nodes[#nodes][2] == 'cs')
          and nodes[#nodes-1][2] == 'an' then
        nodes[#nodes][2] = 'an'
      end
    end

    -- ET/EN               -- W5 + W7->l / W6->on
    if d == 'et' then
      first_et = first_et or (#nodes + 1)
    elseif d == 'en' then
      has_en = true
      first_et = first_et or (#nodes + 1)
    elseif first_et then       -- d may be nil here !
      if has_en then
        if last == 'l' then
          temp = 'l'    -- W7
        else
          temp = 'en'   -- W5
        end
      else
        temp = 'on'     -- W6
      end
      for e = first_et, #nodes do
        if nodes[e][1].id == GLYPH then nodes[e][2] = temp end
      end
      first_et = nil
      has_en = false
    end

    -- Force mathdir in math if ON (currently works as expected only
    -- with 'l')
    if inmath and d == 'on' then
      d = ('TRT' == tex.mathdir) and 'r' or 'l'
    end

    if d then
      if d == 'al' then
        d = 'r'
        last = 'al'
      elseif d == 'l' or d == 'r' then
        last = d
      end
      prev_d = d
      table.insert(nodes, {item, d, outer_first})
    end

    outer_first = nil

  end

  -- TODO -- repeated here in case EN/ET is the last node. Find a
  -- better way of doing things:
  if first_et then       -- dir may be nil here !
    if has_en then
      if last == 'l' then
        temp = 'l'    -- W7
      else
        temp = 'en'   -- W5
      end
    else
      temp = 'on'     -- W6
    end
    for e = first_et, #nodes do
      if nodes[e][1].id == GLYPH then nodes[e][2] = temp end
    end
  end

  -- dummy node, to close things
  table.insert(nodes, {nil, (outer == 'l') and 'l' or 'r', nil})

  ---------------  NEUTRAL -----------------

  outer = save_outer
  last = outer

  local first_on = nil

  for q = 1, #nodes do
    local item

    local outer_first = nodes[q][3]
    outer = outer_first or outer
    last = outer_first or last

    local d = nodes[q][2]
    if d == 'an' or d == 'en' then d = 'r' end
    if d == 'cs' or d == 'et' or d == 'es' then d = 'on' end --- W6

    if d == 'on' then
      first_on = first_on or q
    elseif first_on then
      if last == d then
        temp = d
      else
        temp = outer
      end
      for r = first_on, q - 1 do
        nodes[r][2] = temp
        item = nodes[r][1]    -- MIRRORING
        if Babel.mirroring_enabled and item.id == GLYPH
             and temp == 'r' and characters[item.char] then
          local font_mode = font.fonts[item.font].properties.mode
          if font_mode ~= 'harf' and font_mode ~= 'plug' then
            item.char = characters[item.char].m or item.char
          end
        end
      end
      first_on = nil
    end

    if d == 'r' or d == 'l' then last = d end
  end

  --------------  IMPLICIT, REORDER ----------------

  outer = save_outer
  last = outer

  local state = {}
  state.has_r = false

  for q = 1, #nodes do

    local item = nodes[q][1]

    outer = nodes[q][3] or outer

    local d = nodes[q][2]

    if d == 'nsm' then d = last end             -- W1
    if d == 'en' then d = 'an' end
    local isdir = (d == 'r' or d == 'l')

    if outer == 'l' and d == 'an' then
      state.san = state.san or item
      state.ean = item
    elseif state.san then
      head, state = insert_numeric(head, state)
    end

    if outer == 'l' then
      if d == 'an' or d == 'r' then     -- im -> implicit
        if d == 'r' then state.has_r = true end
        state.sim = state.sim or item
        state.eim = item
      elseif d == 'l' and state.sim and state.has_r then
        head, state = insert_implicit(head, state, outer)
      elseif d == 'l' then
        state.sim, state.eim, state.has_r = nil, nil, false
      end
    else
      if d == 'an' or d == 'l' then
        if nodes[q][3] then -- nil except after an explicit dir
          state.sim = item  -- so we move sim 'inside' the group
        else
          state.sim = state.sim or item
        end
        state.eim = item
      elseif d == 'r' and state.sim then
        head, state = insert_implicit(head, state, outer)
      elseif d == 'r' then
        state.sim, state.eim = nil, nil
      end
    end

    if isdir then
      last = d           -- Don't search back - best save now
    elseif d == 'on' and state.san  then
      state.san = state.san or item
      state.ean = item
    end

  end

  return node.prev(head) or head
end
%</basic>
%    \end{macrocode}
%
% \section{Data for CJK}
%
% It is a boring file and it is not shown here (see the generated file),
% but here is a sample:
%\begin{verbatim}
% [0x0021]={c='ex'},
% [0x0024]={c='pr'},
% [0x0025]={c='po'},
% [0x0028]={c='op'},
% [0x0029]={c='cp'},
% [0x002B]={c='pr'},
%\end{verbatim}
% For the meaning of these codes, see the Unicode standard.
%
%\iffalse
%    \begin{macrocode}
%<*cjkdata>
Babel = Babel or {}

Babel.cjk_characters = {
  [0x0021]={c='ex'},
  [0x0022]={c='qu'},          
  [0x0024]={c='pr'},
  [0x0025]={c='po'},
  [0x0027]={c='qu'},          
  [0x0028]={c='op'},
  [0x0029]={c='cp'},
  [0x002B]={c='pr'},
  [0x002C]={c='is'},
  [0x002D]={c='hy'},
  [0x002E]={c='is'},
  [0x002F]={c='sy'},
  [0x003A]={c='is'},
  [0x003B]={c='is'},
  [0x003F]={c='ex'},
  [0x005B]={c='op'},
  [0x005C]={c='pr'},
  [0x005D]={c='cp'},
  [0x007B]={c='op'},
  [0x007D]={c='cl'},
  [0x00A1]={c='op'},
  [0x00A2]={c='po'},
  [0x00A3]={c='pr'},
  [0x00A4]={c='pr'},
  [0x00A5]={c='pr'},
  [0x00AB]={c='qu'},          
  [0x00B0]={c='po'},
  [0x00B1]={c='pr'},
  [0x00BB]={c='qu'},          
  [0x2018]={c='qu'},          
  [0x2019]={c='qu'},          
  [0x201A]={c='op'},
  [0x201B]={c='qu'},    
  [0x201C]={c='qu'},    
  [0x201D]={c='qu'},          
  [0x201E]={c='op'},
  [0x201F]={c='qu'},          
  [0x2024]={c='in'},
  [0x2025]={c='in'},
  [0x2026]={c='in'},
  [0x2030]={c='po'},
  [0x2031]={c='po'},
  [0x2032]={c='po'},
  [0x2033]={c='po'},
  [0x2034]={c='po'},
  [0x2035]={c='po'},
  [0x2036]={c='po'},
  [0x2037]={c='po'},
  [0x2039]={c='qu'},          
  [0x203A]={c='qu'},            
  [0x203C]={c='ns'},
  [0x203D]={c='ns'},
  [0x2044]={c='is'},
  [0x2045]={c='op'},
  [0x2046]={c='cl'},
  [0x2047]={c='ns'},
  [0x2048]={c='ns'},
  [0x2049]={c='ns'},
  [0x207D]={c='op'},
  [0x207E]={c='cl'},
  [0x208D]={c='op'},
  [0x208E]={c='cl'},
  [0x20A7]={c='po'},
  [0x20B6]={c='po'},
  [0x20BB]={c='po'},
  [0x20BE]={c='po'},
  [0x2103]={c='po'},
  [0x2109]={c='po'},
  [0x2116]={c='pr'},
  [0x2212]={c='pr'},
  [0x2213]={c='pr'},
  [0x22EF]={c='in'},
  [0x2308]={c='op'},
  [0x2309]={c='cl'},
  [0x230A]={c='op'},
  [0x230B]={c='cl'},
  [0x2329]={c='op'},
  [0x232A]={c='cl'},
  [0x2983]={c='op'},
  [0x2984]={c='cl'},
  [0x2985]={c='op'},
  [0x2986]={c='cl'},
  [0x2987]={c='op'},
  [0x2988]={c='cl'},
  [0x2989]={c='op'},
  [0x298A]={c='cl'},
  [0x298B]={c='op'},
  [0x298C]={c='cl'},
  [0x298D]={c='op'},
  [0x298E]={c='cl'},
  [0x298F]={c='op'},
  [0x2990]={c='cl'},
  [0x2991]={c='op'},
  [0x2992]={c='cl'},
  [0x2993]={c='op'},
  [0x2994]={c='cl'},
  [0x2995]={c='op'},
  [0x2996]={c='cl'},
  [0x2997]={c='op'},
  [0x2998]={c='cl'},
  [0x29D8]={c='op'},
  [0x29D9]={c='cl'},
  [0x29DA]={c='op'},
  [0x29DB]={c='cl'},
  [0x29FC]={c='op'},
  [0x29FD]={c='cl'},
  [0x2CF9]={c='ex'},
  [0x2CFE]={c='ex'},
  [0x2E02]={c='qu'},          
  [0x2E03]={c='qu'},          
  [0x2E04]={c='qu'},          
  [0x2E05]={c='qu'},          
  [0x2E06]={c='qu'},    
  [0x2E07]={c='qu'},    
  [0x2E08]={c='qu'},    
  [0x2E09]={c='qu'},          
  [0x2E0A]={c='qu'},          
  [0x2E0B]={c='qu'},          
  [0x2E0C]={c='qu'},          
  [0x2E0D]={c='qu'},          
  [0x2E18]={c='op'},
  [0x2E1C]={c='qu'},          
  [0x2E1D]={c='qu'},          
  [0x2E20]={c='qu'},          
  [0x2E21]={c='qu'}, 
  [0x2E22]={c='op'},
  [0x2E23]={c='cl'},
  [0x2E24]={c='op'},
  [0x2E25]={c='cl'},
  [0x2E26]={c='op'},
  [0x2E27]={c='cl'},
  [0x2E28]={c='op'},
  [0x2E29]={c='cl'},
  [0x2E2E]={c='ex'},
  [0x2E42]={c='op'},
  [0x3001]={c='cl'},
  [0x3002]={c='cl'},
  [0x3005]={c='ns'},
  [0x3008]={c='op'},
  [0x3009]={c='cl'},
  [0x300A]={c='op'},
  [0x300B]={c='cl'},
  [0x300C]={c='op'},
  [0x300D]={c='cl'},
  [0x300E]={c='op'},
  [0x300F]={c='cl'},
  [0x3010]={c='op'},
  [0x3011]={c='cl'},
  [0x3014]={c='op'},
  [0x3015]={c='cl'},
  [0x3016]={c='op'},
  [0x3017]={c='cl'},
  [0x3018]={c='op'},
  [0x3019]={c='cl'},
  [0x301A]={c='op'},
  [0x301B]={c='cl'},
  [0x301C]={c='ns'},
  [0x301D]={c='op'},
  [0x301E]={c='cl'},
  [0x301F]={c='cl'},
  [0x303B]={c='ns'},
  [0x303C]={c='ns'},
  [0x309B]={c='ns'},
  [0x309C]={c='ns'},
  [0x309D]={c='ns'},
  [0x309E]={c='ns'},
  [0x30A0]={c='ns'},
  [0x30FB]={c='ns'},
  [0x30FD]={c='ns'},
  [0x30FE]={c='ns'},
  [0xA015]={c='ns'},
  [0xA60E]={c='ex'},
  [0xA838]={c='po'},
  [0xFD3E]={c='cl'},
  [0xFD3F]={c='op'},
  [0xFDFC]={c='po'},
  [0xFE10]={c='is'},
  [0xFE11]={c='cl'},
  [0xFE12]={c='cl'},
  [0xFE13]={c='is'},
  [0xFE14]={c='is'},
  [0xFE15]={c='ex'},
  [0xFE16]={c='ex'},
  [0xFE17]={c='op'},
  [0xFE18]={c='cl'},
  [0xFE19]={c='in'},
  [0xFE35]={c='op'},
  [0xFE36]={c='cl'},
  [0xFE37]={c='op'},
  [0xFE38]={c='cl'},
  [0xFE39]={c='op'},
  [0xFE3A]={c='cl'},
  [0xFE3B]={c='op'},
  [0xFE3C]={c='cl'},
  [0xFE3D]={c='op'},
  [0xFE3E]={c='cl'},
  [0xFE3F]={c='op'},
  [0xFE40]={c='cl'},
  [0xFE41]={c='op'},
  [0xFE42]={c='cl'},
  [0xFE43]={c='op'},
  [0xFE44]={c='cl'},
  [0xFE47]={c='op'},
  [0xFE48]={c='cl'},
  [0xFE50]={c='cl'},
  [0xFE52]={c='cl'},
  [0xFE54]={c='ns'},
  [0xFE55]={c='ns'},
  [0xFE56]={c='ex'},
  [0xFE57]={c='ex'},
  [0xFE59]={c='op'},
  [0xFE5A]={c='cl'},
  [0xFE5B]={c='op'},
  [0xFE5C]={c='cl'},
  [0xFE5D]={c='op'},
  [0xFE5E]={c='cl'},
  [0xFE69]={c='pr'},
  [0xFE6A]={c='po'},
  [0xFF01]={c='ex', w='f'},
  [0xFF04]={c='pr', w='f'},
  [0xFF05]={c='po', w='f'},
  [0xFF08]={c='op', w='f'},
  [0xFF09]={c='cl', w='f'},
  [0xFF0C]={c='cl', w='f'},
  [0xFF0E]={c='cl', w='f'},
  [0xFF1A]={c='ns', w='f'},
  [0xFF1B]={c='ns', w='f'},
  [0xFF1F]={c='ex', w='f'},
  [0xFF3B]={c='op', w='f'},
  [0xFF3D]={c='cl', w='f'},
  [0xFF5B]={c='op', w='f'},
  [0xFF5D]={c='cl', w='f'},
  [0xFF5F]={c='op', w='f'},
  [0xFF60]={c='cl', w='f'},
  [0xFF61]={c='cl', w='h'},
  [0xFF62]={c='op', w='h'},
  [0xFF63]={c='cl', w='h'},
  [0xFF64]={c='cl', w='h'} 
}

Babel.cjk_class = setmetatable ( Babel.cjk_characters, {
  __index = function(_, k)
    if (k >= 0xAC00  and k <= 0xD7A3)      -- H2/H3
        or (k >= 0x2E80  and k <= 0x9FFF)
        or (k >= 0xA000  and k <= 0xA48F)  -- Yi
        or (k >= 0xA490  and k <= 0xA4CF)  -- Yi
        or (k >= 0xF900  and k <= 0xFAFF)
        or (k >= 0xFE10  and k <= 0xFE1F) 
        or (k >= 0xFE30  and k <= 0xFE6F)
        or (k >= 0xFF00  and k <= 0xFFEF)
        or (k >= 0x1F000 and k <= 0x1FFFD)
        or (k >= 0x20000 and k <= 0x2FFFD)
        or (k >= 0x30000 and k <= 0x3FFFD) then
      return {c='I'}
    elseif (k >= 0x20A0  and k <= 0x20CF) then
      return {c='pr'}
    else
      return {c='O'}
    end
  end })

-- Note ns = ex = sy = is = po = hy. Here, 'I' and 'O' are
-- pseudo-classes for ideographic-like (id, h2, h3), and 'other',
-- respectively. Jamo is not considered yet, but very likely at least
-- jl must be.

Babel.cjk_breaks = {
  ['op'] = { },
  ['cl'] = { ['op']=1, ['pr']=1,           ['in']=1, ['I']=1 },
  ['ns'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['ex'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['sy'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['is'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['pr'] = {           ['pr']=1, ['po']=1, ['in']=1 },
  ['po'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['in'] = { ['op']=1, ['pr']=1, ['po']=1,           ['I']=1 },
  ['hy'] = { ['op']=1, ['pr']=1, ['po']=1, ['in']=1, ['I']=1 },
  ['qu'] = { },
  --
  ['I']  = { ['op']=1, ['pr']=1, ['I']=1, ['O']=1 },
  ['O']  = {                     ['I']=1 }
}
%</cjkdata>
%    \end{macrocode}
%\fi
%
% \section{The `nil' language}
%
%    This `language' does nothing, except setting the hyphenation patterns to
%    nohyphenation.
%
%    For this language currently no special definitions are needed or
%    available.
%
%    The macro |\LdfInit| takes care of preventing that this file is
%    loaded more than once, checking the category code of the
%    \texttt{@} sign, etc.
%
%    \begin{macrocode}
%<*nil>
\ProvidesLanguage{nil}[<@date@> <@version@> Nil language]
\LdfInit{nil}{datenil}
%    \end{macrocode}
%
%    When this file is read as an option, i.e. by the |\usepackage|
%    command, \texttt{nil} could be an `unknown' language in which
%    case we have to make it known.
%
%    \begin{macrocode}
\ifx\l@nil\@undefined
  \newlanguage\l@nil
  \@namedef{bbl@hyphendata@\the\l@nil}{{}{}}% Remove warning
  \let\bbl@elt\relax
  \edef\bbl@languages{%  Add it to the list of languages
    \bbl@languages\bbl@elt{nil}{\the\l@nil}{}{}}
\fi
%    \end{macrocode}
%
%    This macro is used to store the values of the hyphenation
%    parameters |\lefthyphenmin| and |\righthyphenmin|.
%
%    \begin{macrocode}
\providehyphenmins{\CurrentOption}{\m@ne\m@ne}
%    \end{macrocode}
%
%    The next step consists of defining commands to switch to (and
%    from) the `nil' language.
% \begin{macro}{\captionnil}
% \begin{macro}{\datenil}
%
%    \begin{macrocode}
\let\captionsnil\@empty
\let\datenil\@empty
%    \end{macrocode}
%
% \end{macro}
% \end{macro}
%
%    The macro |\ldf@finish| takes care of looking for a
%    configuration file, setting the main language to be switched on
%    at |\begin{document}| and resetting the category code of
%    \texttt{@} to its original value.
%
%    \begin{macrocode}
\ldf@finish{nil}
%</nil>
%    \end{macrocode}
%
% \section{Support for Plain \TeX\ (\texttt{plain.def})}
%
% \subsection{Not renaming \file{hyphen.tex}}
%
% As Don Knuth has declared that the filename \file{hyphen.tex} may
% only be used to designate \emph{his} version of the american
% English hyphenation patterns, a new solution has to be found in
% order to be able to load hyphenation patterns for other languages
% in a plain-based \TeX-format.
% When asked he responded:
% \begin{quote}
%   That file name is ``sacred'', and if anybody changes it they will
%   cause severe upward/downward compatibility headaches.
%
%   People can have a file localhyphen.tex or whatever they like,
%   but they mustn't diddle with hyphen.tex (or plain.tex except to
%   preload additional fonts).
% \end{quote}
%
% The files \file{bplain.tex} and \file{blplain.tex} can be used as
% replacement wrappers around \file{plain.tex} and
% \file{lplain.tex} to achieve the desired effect, based on the
% \pkg{babel} package. If you load each of them with ini\TeX, you
% will get a file called either \file{bplain.fmt} or
% \file{blplain.fmt}, which you can use as replacements for
% \file{plain.fmt} and \file{lplain.fmt}.
%
% As these files are going to be read as the first thing ini\TeX\
% sees, we need to set some category codes just to be able to
% change the definition of |\input|.
%
%    \begin{macrocode}
%<*bplain|blplain>
\catcode`\{=1 % left brace is begin-group character
\catcode`\}=2 % right brace is end-group character
\catcode`\#=6 % hash mark is macro parameter character
%    \end{macrocode}
%
% If a file called \file{hyphen.cfg} can be found, we make sure that
% \emph{it} will be read instead of the file \file{hyphen.tex}. We
% do this by first saving the original meaning of |\input| (and I
% use a one letter control sequence for that so as not to waste
% multi-letter control sequence on this in the format).
%
%    \begin{macrocode}
\openin 0 hyphen.cfg
\ifeof0
\else
  \let\a\input
%    \end{macrocode}
%
% Then |\input| is defined to forget about its argument and load
% \file{hyphen.cfg} instead. Once that's done the original meaning
% of |\input| can be restored and the definition of |\a| can be
% forgotten.
%
%    \begin{macrocode}
  \def\input #1 {%
    \let\input\a
    \a hyphen.cfg
    \let\a\undefined
  }
\fi
%</bplain|blplain>
%    \end{macrocode}
%
% Now that we have made sure that \file{hyphen.cfg} will be loaded
% at the right moment it is time to load \file{plain.tex}.
%
%    \begin{macrocode}
%<bplain>\a plain.tex
%<blplain>\a lplain.tex
%    \end{macrocode}
%
% Finally we change the contents of |\fmtname| to indicate that
% this is \emph{not} the plain format, but a format based on plain
% with the \pkg{babel} package preloaded.
%
%    \begin{macrocode}
%<bplain>\def\fmtname{babel-plain}
%<blplain>\def\fmtname{babel-lplain}
%    \end{macrocode}
%
% When you are using a different format, based on plain.tex you can
% make a copy of blplain.tex, rename it and replace \file{plain.tex}
% with the name of your format file.
%
% \subsection{Emulating some \LaTeX{} features}
%
% The following code duplicates or emulates parts of \LaTeXe\ that
% are needed for \babel.
%
%    \begin{macrocode}
%<<*Emulate LaTeX>>
  % == Code for plain ==
\def\@empty{}
\def\loadlocalcfg#1{%
  \openin0#1.cfg
  \ifeof0
    \closein0
  \else
    \closein0
    {\immediate\write16{*************************************}%
     \immediate\write16{* Local config file #1.cfg used}%
     \immediate\write16{*}%
     }
    \input #1.cfg\relax
  \fi
  \@endofldf}
%    \end{macrocode}
%
% \subsection{General tools}
%
%    A number of \LaTeX\ macro's that are needed later on.
%
%    \begin{macrocode}
\long\def\@firstofone#1{#1}
\long\def\@firstoftwo#1#2{#1}
\long\def\@secondoftwo#1#2{#2}
\def\@nnil{\@nil}
\def\@gobbletwo#1#2{}
\def\@ifstar#1{\@ifnextchar *{\@firstoftwo{#1}}}
\def\@star@or@long#1{%
  \@ifstar
  {\let\l@ngrel@x\relax#1}%
  {\let\l@ngrel@x\long#1}}
\let\l@ngrel@x\relax
\def\@car#1#2\@nil{#1}
\def\@cdr#1#2\@nil{#2}
\let\@typeset@protect\relax
\let\protected@edef\edef
\long\def\@gobble#1{}
\edef\@backslashchar{\expandafter\@gobble\string\\}
\def\strip@prefix#1>{}
\def\g@addto@macro#1#2{{%
    \toks@\expandafter{#1#2}%
    \xdef#1{\the\toks@}}}
\def\@namedef#1{\expandafter\def\csname #1\endcsname}
\def\@nameuse#1{\csname #1\endcsname}
\def\@ifundefined#1{%
  \expandafter\ifx\csname#1\endcsname\relax
    \expandafter\@firstoftwo
  \else
    \expandafter\@secondoftwo
  \fi}
\def\@expandtwoargs#1#2#3{%
  \edef\reserved@a{\noexpand#1{#2}{#3}}\reserved@a}
\def\zap@space#1 #2{%
  #1%
  \ifx#2\@empty\else\expandafter\zap@space\fi
  #2}
\let\bbl@trace\@gobble
%    \end{macrocode}
%
%    \LaTeXe\ has the command |\@onlypreamble| which adds commands to
%    a list of commands that are no longer needed after
%    |\begin{document}|.
%
%    \begin{macrocode}
\ifx\@preamblecmds\@undefined
  \def\@preamblecmds{}
\fi
\def\@onlypreamble#1{%
  \expandafter\gdef\expandafter\@preamblecmds\expandafter{%
    \@preamblecmds\do#1}}
\@onlypreamble\@onlypreamble
%    \end{macrocode}
%
%    Mimick \LaTeX's |\AtBeginDocument|; for this to work the user
%    needs to add |\begindocument| to his file.
%
%    \begin{macrocode}
\def\begindocument{%
  \@begindocumenthook
  \global\let\@begindocumenthook\@undefined
  \def\do##1{\global\let##1\@undefined}%
  \@preamblecmds
  \global\let\do\noexpand}
%    \end{macrocode}
%
%    \begin{macrocode}
\ifx\@begindocumenthook\@undefined
  \def\@begindocumenthook{}
\fi
\@onlypreamble\@begindocumenthook
\def\AtBeginDocument{\g@addto@macro\@begindocumenthook}
%    \end{macrocode}
%
%    We also have to mimick \LaTeX's |\AtEndOfPackage|. Our
%    replacement macro is much simpler; it stores its argument in
%    |\@endofldf|.
%
%    \begin{macrocode}
\def\AtEndOfPackage#1{\g@addto@macro\@endofldf{#1}}
\@onlypreamble\AtEndOfPackage
\def\@endofldf{}
\@onlypreamble\@endofldf
\let\bbl@afterlang\@empty
\chardef\bbl@opt@hyphenmap\z@
%    \end{macrocode}
%
%    \LaTeX\ needs to be able to switch off writing to its auxiliary
%    files; plain doesn't have them by default. There is a trick to
%    hide some conditional commands from the outer |\ifx|. The same
%    trick is applied below.
%
%    \begin{macrocode}
\catcode`\&=\z@
\ifx&if@filesw\@undefined
  \expandafter\let\csname if@filesw\expandafter\endcsname
    \csname iffalse\endcsname
\fi
\catcode`\&=4
%    \end{macrocode}
%
%    Mimick \LaTeX's commands to define control sequences.
%
%    \begin{macrocode}
\def\newcommand{\@star@or@long\new@command}
\def\new@command#1{%
  \@testopt{\@newcommand#1}0}
\def\@newcommand#1[#2]{%
  \@ifnextchar [{\@xargdef#1[#2]}%
                {\@argdef#1[#2]}}
\long\def\@argdef#1[#2]#3{%
  \@yargdef#1\@ne{#2}{#3}}
\long\def\@xargdef#1[#2][#3]#4{%
  \expandafter\def\expandafter#1\expandafter{%
    \expandafter\@protected@testopt\expandafter #1%
    \csname\string#1\expandafter\endcsname{#3}}%
  \expandafter\@yargdef \csname\string#1\endcsname
  \tw@{#2}{#4}}
\long\def\@yargdef#1#2#3{%
  \@tempcnta#3\relax
  \advance \@tempcnta \@ne
  \let\@hash@\relax
  \edef\reserved@a{\ifx#2\tw@ [\@hash@1]\fi}%
  \@tempcntb #2%
  \@whilenum\@tempcntb <\@tempcnta
  \do{%
    \edef\reserved@a{\reserved@a\@hash@\the\@tempcntb}%
    \advance\@tempcntb \@ne}%
  \let\@hash@##%
  \l@ngrel@x\expandafter\def\expandafter#1\reserved@a}
\def\providecommand{\@star@or@long\provide@command}
\def\provide@command#1{%
  \begingroup
    \escapechar\m@ne\xdef\@gtempa{{\string#1}}%
  \endgroup
  \expandafter\@ifundefined\@gtempa
    {\def\reserved@a{\new@command#1}}%
    {\let\reserved@a\relax
     \def\reserved@a{\new@command\reserved@a}}%
   \reserved@a}%
%    \end{macrocode}
%
%    \begin{macrocode}
\def\DeclareRobustCommand{\@star@or@long\declare@robustcommand}
\def\declare@robustcommand#1{%
   \edef\reserved@a{\string#1}%
   \def\reserved@b{#1}%
   \edef\reserved@b{\expandafter\strip@prefix\meaning\reserved@b}%
   \edef#1{%
      \ifx\reserved@a\reserved@b
         \noexpand\x@protect
         \noexpand#1%
      \fi
      \noexpand\protect
      \expandafter\noexpand\csname
         \expandafter\@gobble\string#1 \endcsname
   }%
   \expandafter\new@command\csname
      \expandafter\@gobble\string#1 \endcsname
}
\def\x@protect#1{%
   \ifx\protect\@typeset@protect\else
      \@x@protect#1%
   \fi
}
\catcode`\&=\z@  % Trick to hide conditionals
  \def\@x@protect#1&fi#2#3{&fi\protect#1}
%    \end{macrocode}
%
%    The following little macro |\in@| is taken from \file{latex.ltx};
%    it checks whether its first argument is part of its second
%    argument. It uses the boolean |\in@|; allocating a new boolean
%    inside conditionally executed code is not possible, hence the
%    construct with the temporary definition of |\bbl@tempa|.
%
%    \begin{macrocode}
  \def\bbl@tempa{\csname newif\endcsname&ifin@}
\catcode`\&=4
\ifx\in@\@undefined
  \def\in@#1#2{%
    \def\in@@##1#1##2##3\in@@{%
      \ifx\in@##2\in@false\else\in@true\fi}%
    \in@@#2#1\in@\in@@}
\else
  \let\bbl@tempa\@empty
\fi
\bbl@tempa
%    \end{macrocode}
%
%    \LaTeX\ has a macro to check whether a certain package was loaded
%    with specific options. The command has two extra arguments which
%    are code to be executed in either the true or false case.
%    This is used to detect whether the document needs one of the
%    accents to be activated (\Lopt{activegrave} and
%    \Lopt{activeacute}). For plain \TeX\ we assume that the user
%    wants them to be active by default. Therefore the only thing we
%    do is execute the third argument (the code for the true case).
%
%    \begin{macrocode}
\def\@ifpackagewith#1#2#3#4{#3}
%    \end{macrocode}
%
%    The \LaTeX\ macro |\@ifl@aded| checks whether a file was
%    loaded. This functionality is not needed for plain \TeX\ but we
%    need the macro to be defined as a no-op.
%
%    \begin{macrocode}
\def\@ifl@aded#1#2#3#4{}
%    \end{macrocode}
%
%    For the following code we need to make sure that the commands
%    |\newcommand| and |\providecommand| exist with some sensible
%    definition. They are not fully equivalent to their \LaTeXe\
%    versions; just enough to make things work in plain~\TeX
%    environments.
%
%    \begin{macrocode}
\ifx\@tempcnta\@undefined
  \csname newcount\endcsname\@tempcnta\relax
\fi
\ifx\@tempcntb\@undefined
  \csname newcount\endcsname\@tempcntb\relax
\fi
%    \end{macrocode}
%
%    To prevent wasting two counters in \LaTeX$\:$2.09 (because
%    counters with the same name are allocated later by it) we reset
%    the counter that holds the next free counter (|\count10|).
%
%    \begin{macrocode}
\ifx\bye\@undefined
  \advance\count10 by -2\relax
\fi
\ifx\@ifnextchar\@undefined
  \def\@ifnextchar#1#2#3{%
    \let\reserved@d=#1%
    \def\reserved@a{#2}\def\reserved@b{#3}%
    \futurelet\@let@token\@ifnch}
  \def\@ifnch{%
    \ifx\@let@token\@sptoken
      \let\reserved@c\@xifnch
    \else
      \ifx\@let@token\reserved@d
        \let\reserved@c\reserved@a
      \else
        \let\reserved@c\reserved@b
      \fi
    \fi
    \reserved@c}
  \def\:{\let\@sptoken= } \:  % this makes \@sptoken a space token
  \def\:{\@xifnch} \expandafter\def\: {\futurelet\@let@token\@ifnch}
\fi
\def\@testopt#1#2{%
  \@ifnextchar[{#1}{#1[#2]}}
\def\@protected@testopt#1{%
  \ifx\protect\@typeset@protect
    \expandafter\@testopt
  \else
    \@x@protect#1%
  \fi}
\long\def\@whilenum#1\do #2{\ifnum #1\relax #2\relax\@iwhilenum{#1\relax
     #2\relax}\fi}
\long\def\@iwhilenum#1{\ifnum #1\expandafter\@iwhilenum
         \else\expandafter\@gobble\fi{#1}}
%    \end{macrocode}
%
% \subsection{Encoding related macros}
%
%    Code from \file{ltoutenc.dtx}, adapted for use in the plain \TeX\
%    environment.
%
%    \begin{macrocode}
\def\DeclareTextCommand{%
   \@dec@text@cmd\providecommand
}
\def\ProvideTextCommand{%
   \@dec@text@cmd\providecommand
}
\def\DeclareTextSymbol#1#2#3{%
   \@dec@text@cmd\chardef#1{#2}#3\relax
}
\def\@dec@text@cmd#1#2#3{%
   \expandafter\def\expandafter#2%
      \expandafter{%
         \csname#3-cmd\expandafter\endcsname
         \expandafter#2%
         \csname#3\string#2\endcsname
      }%
%   \let\@ifdefinable\@rc@ifdefinable
   \expandafter#1\csname#3\string#2\endcsname
}
\def\@current@cmd#1{%
  \ifx\protect\@typeset@protect\else
      \noexpand#1\expandafter\@gobble
  \fi
}
\def\@changed@cmd#1#2{%
   \ifx\protect\@typeset@protect
      \expandafter\ifx\csname\cf@encoding\string#1\endcsname\relax
         \expandafter\ifx\csname ?\string#1\endcsname\relax
            \expandafter\def\csname ?\string#1\endcsname{%
               \@changed@x@err{#1}%
            }%
         \fi
         \global\expandafter\let
           \csname\cf@encoding \string#1\expandafter\endcsname
           \csname ?\string#1\endcsname
      \fi
      \csname\cf@encoding\string#1%
        \expandafter\endcsname
   \else
      \noexpand#1%
   \fi
}
\def\@changed@x@err#1{%
    \errhelp{Your command will be ignored, type <return> to proceed}%
    \errmessage{Command \protect#1 undefined in encoding \cf@encoding}}
\def\DeclareTextCommandDefault#1{%
   \DeclareTextCommand#1?%
}
\def\ProvideTextCommandDefault#1{%
   \ProvideTextCommand#1?%
}
\expandafter\let\csname OT1-cmd\endcsname\@current@cmd
\expandafter\let\csname?-cmd\endcsname\@changed@cmd
\def\DeclareTextAccent#1#2#3{%
  \DeclareTextCommand#1{#2}[1]{\accent#3 ##1}
}
\def\DeclareTextCompositeCommand#1#2#3#4{%
   \expandafter\let\expandafter\reserved@a\csname#2\string#1\endcsname
   \edef\reserved@b{\string##1}%
   \edef\reserved@c{%
     \expandafter\@strip@args\meaning\reserved@a:-\@strip@args}%
   \ifx\reserved@b\reserved@c
      \expandafter\expandafter\expandafter\ifx
         \expandafter\@car\reserved@a\relax\relax\@nil
         \@text@composite
      \else
         \edef\reserved@b##1{%
            \def\expandafter\noexpand
               \csname#2\string#1\endcsname####1{%
               \noexpand\@text@composite
                  \expandafter\noexpand\csname#2\string#1\endcsname
                  ####1\noexpand\@empty\noexpand\@text@composite
                  {##1}%
            }%
         }%
         \expandafter\reserved@b\expandafter{\reserved@a{##1}}%
      \fi
      \expandafter\def\csname\expandafter\string\csname
         #2\endcsname\string#1-\string#3\endcsname{#4}
   \else
     \errhelp{Your command will be ignored, type <return> to proceed}%
     \errmessage{\string\DeclareTextCompositeCommand\space used on
         inappropriate command \protect#1}
   \fi
}
\def\@text@composite#1#2#3\@text@composite{%
   \expandafter\@text@composite@x
      \csname\string#1-\string#2\endcsname
}
\def\@text@composite@x#1#2{%
   \ifx#1\relax
      #2%
   \else
      #1%
   \fi
}
%
\def\@strip@args#1:#2-#3\@strip@args{#2}
\def\DeclareTextComposite#1#2#3#4{%
   \def\reserved@a{\DeclareTextCompositeCommand#1{#2}{#3}}%
   \bgroup
      \lccode`\@=#4%
      \lowercase{%
   \egroup
      \reserved@a @%
   }%
}
%
\def\UseTextSymbol#1#2{#2}
\def\UseTextAccent#1#2#3{}
\def\@use@text@encoding#1{}
\def\DeclareTextSymbolDefault#1#2{%
   \DeclareTextCommandDefault#1{\UseTextSymbol{#2}#1}%
}
\def\DeclareTextAccentDefault#1#2{%
   \DeclareTextCommandDefault#1{\UseTextAccent{#2}#1}%
}
\def\cf@encoding{OT1}
%    \end{macrocode}
%
%    Currently we only use the \LaTeXe\ method for accents for those
%    that are known to be made active in \emph{some} language
%    definition file.
%
%    \begin{macrocode}
\DeclareTextAccent{\"}{OT1}{127}
\DeclareTextAccent{\'}{OT1}{19}
\DeclareTextAccent{\^}{OT1}{94}
\DeclareTextAccent{\`}{OT1}{18}
\DeclareTextAccent{\~}{OT1}{126}
%    \end{macrocode}
%
%    The following control sequences are used in \file{babel.def}
%    but are not defined for \textsc{plain} \TeX.
%
%    \begin{macrocode}
\DeclareTextSymbol{\textquotedblleft}{OT1}{92}
\DeclareTextSymbol{\textquotedblright}{OT1}{`\"}
\DeclareTextSymbol{\textquoteleft}{OT1}{`\`}
\DeclareTextSymbol{\textquoteright}{OT1}{`\'}
\DeclareTextSymbol{\i}{OT1}{16}
\DeclareTextSymbol{\ss}{OT1}{25}
%    \end{macrocode}
%
%    For a couple of languages we need the \LaTeX-control sequence
%    |\scriptsize| to be available. Because plain \TeX\ doesn't have
%    such a sofisticated font mechanism as \LaTeX\ has, we just |\let|
%    it to |\sevenrm|.
%
%    \begin{macrocode}
\ifx\scriptsize\@undefined
  \let\scriptsize\sevenrm
\fi
  % End of code for plain
%<</Emulate LaTeX>>
%    \end{macrocode}
%
% A proxy file:
%    \begin{macrocode}
%<*plain>
\input babel.def
%</plain>
%    \end{macrocode}
%
% \Finale
%
\endinput
%
% Local Variables:
% mode: doctex
% coding: utf-8
% TeX-engine: luatex
% End:
