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|
% \iffalse meta-comment
%
%% File: l3bootstrap.dtx Copyright (C) 2011-2015 The LaTeX3 project
%%
%% It may be distributed and/or modified under the conditions of the
%% LaTeX Project Public License (LPPL), either version 1.3c of this
%% license or (at your option) any later version. The latest version
%% of this license is in the file
%%
%% http://www.latex-project.org/lppl.txt
%%
%% This file is part of the "l3kernel bundle" (The Work in LPPL)
%% and all files in that bundle must be distributed together.
%%
%% The released version of this bundle is available from CTAN.
%%
%% -----------------------------------------------------------------------
%%
%% The development version of the bundle can be found at
%%
%% http://www.latex-project.org/svnroot/experimental/trunk/
%%
%% for those people who are interested.
%%
%%%%%%%%%%%
%% NOTE: %%
%%%%%%%%%%%
%%
%% Snapshots taken from the repository represent work in progress and may
%% not work or may contain conflicting material! We therefore ask
%% people _not_ to put them into distributions, archives, etc. without
%% prior consultation with the LaTeX3 Project.
%%
%% -----------------------------------------------------------------------
%
%<*driver|package>
% \begin{macro}{\GetIdInfo}
% \begin{macro}[aux]{\GetIdInfoAuxI, \GetIdInfoAuxII, \GetIdInfoAuxIII}
% \begin{macro}[int]{\GetIdInfoLog}
% The idea here is to extract out the information needed from a standard
% \textsc{svn} \texttt{Id} line, but without a line that will get
% changed when the file is checked in. Hence the fact that there is
% not a line which includes both a dollar sign and the \texttt{Id}
% keyword together!
%
% At this stage, no test has taken place for the \eTeX{} extensions, and
% so using \tn{protected} could give an error. To avoid that, it is used
% by csname: if it's not available, the bootstrap code will bail out at
% the point of testing for the necessary primitives, while if it is available
% then \cs{GetIdInfo} and so on will be properly protected. All of this is
% then done in a group to avoid leaving \tn{protected} about as equivalent
% to \tn{relax} if the extensions are unavailable.
% \begin{macrocode}
\begingroup
\csname protected\endcsname\gdef\GetIdInfo
{%
\begingroup
\catcode 32 = 10 %
\GetIdInfoAuxI
}
% \end{macrocode}
% A first check for a completely empty \textsc{svn} field. If that is
% not the case, there is a second case when a file created using
% \texttt{svn cp} but has not been checked in. That leaves a special
% marker \texttt{-1} version, which has no further data. Dealing correctly
% with that is the reason for the space in the line to use
% \cs{GetIdInforAuxII}.
% \begin{macrocode}
\csname protected\endcsname\gdef\GetIdInfoAuxI$#1$#2%
{%
\def\tempa{#1}%
\def\tempb{Id}%
\ifx\tempa\tempb
\def\tempa
{%
\endgroup
\def\ExplFileDate{0000/00/00}%
\def\ExplFileDescription{#2}%
\def\ExplFileName{[unknown name]}%
\def\ExplFileExtension{[unknown extension]}%
\def\ExplFileVersion{-1}%
}%
\else
\def\tempa
{%
\endgroup
\def\ExplFileDescription{#2}%
\GetIdInfoAuxII$#1 $%
}%
\fi
\tempa
\GetIdInfoLog
}
% \end{macrocode}
% Here, |#1| is |Id|, |#2| is the file name, |#3| is the extension,
% |#4| is the version, |#5| is the check in date and |#6| is the check in
% time and user, plus some trailing spaces. If |#4| is the marker |-1| value
% then |#5| and |#6| will be empty.
% \begin{macrocode}
\csname protected\endcsname\gdef\GetIdInfoAuxII$#1 #2.#3 #4 #5 #6$%
{%
\def\ExplFileName{#2}%
\def\ExplFileExtension{#3}%
\def\ExplFileVersion{#4}%
\begingroup
\def\tempa{#4}%
\def\tempb{-1}%
\ifx\tempa\tempb
\def\tempa
{%
\endgroup
\def\ExplFileDate{0000/00/00}%
}%
\else
\def\tempa
{%
\endgroup
\GetIdInfoAuxIII$#5$%
}%
\fi
\tempa
}
% \end{macrocode}
% Convert an \textsc{svn}-style date into a \LaTeX{}-style one.
% \begin{macrocode}
\csname protected\endcsname\gdef\GetIdInfoAuxIII$#1-#2-#3$%
{%
\def\ExplFileDate{#1/#2/#3}%
}
% \end{macrocode}
% During loading of \pkg{expl3}, module information is added to the log.
% This function gets redefined once loading is complete.
% \begin{macrocode}
\csname protected\endcsname\gdef\GetIdInfoLog
{%
\immediate\write-1 %
{%
L3 Module:
\ExplFileName\space
\ExplFileDate\space v\ExplFileVersion\space \ExplFileDescription
}
}
\endgroup
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
\GetIdInfo$Id: l3bootstrap.dtx 5634 2015-06-24 14:51:22Z joseph $
{L3 Bootstrap code}
%</driver|package>
%<*driver>
\documentclass[full]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3bootstrap} package\\ Bootstrap code^^A
% \thanks{This file describes v\ExplFileVersion,
% last revised \ExplFileDate.}^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released \ExplFileDate}
%
% \maketitle
%
% \begin{documentation}
%
% \section{Using the \LaTeX3 modules}
%
% The modules documented in \file{source3} are designed to be used on top of
% \LaTeXe{} and are loaded all as one with the usual |\usepackage{expl3}| or
% |\RequirePackage{expl3}| instructions. These modules will also form the
% basis of the \LaTeX3 format, but work in this area is incomplete and not
% included in this documentation at present.
%
% As the modules use a coding syntax different from standard
% \LaTeXe{} it provides a few functions for setting it up.
%
% \begin{function}[updated = 2011-08-13]{\ExplSyntaxOn, \ExplSyntaxOff}
% \begin{syntax}
% \cs{ExplSyntaxOn} \meta{code} \cs{ExplSyntaxOff}
% \end{syntax}
% The \cs{ExplSyntaxOn} function switches to a category code
% r\'{e}gime in which spaces are ignored and in which the colon (|:|)
% and underscore (|_|) are treated as \enquote{letters}, thus allowing
% access to the names of code functions and variables. Within this
% environment, |~| is used to input a space. The \cs{ExplSyntaxOff}
% reverts to the document category code r\'{e}gime.
% \end{function}
%
% \begin{function}{\ProvidesExplPackage, \ProvidesExplClass, \ProvidesExplFile}
% \begin{syntax}
% |\RequirePackage{expl3}| \\
% \cs{ProvidesExplPackage} \Arg{package} \Arg{date} \Arg{version} \Arg{description}
% \end{syntax}
% These functions act broadly in the same way as the corresponding
% \LaTeXe{} kernel
% functions \tn{ProvidesPackage}, \tn{ProvidesClass} and
% \tn{ProvidesFile}. However, they also implicitly switch
% \cs{ExplSyntaxOn} for the remainder of the code with the file. At the
% end of the file, \cs{ExplSyntaxOff} will be called to reverse this.
% (This is the same concept as \LaTeXe{} provides in turning on
% \tn{makeatletter} within package and class code.) The \meta{date} should
% be given in the format \meta{year}/\meta{month}/\meta{day}.
% \end{function}
%
% \begin{function}[updated = 2012-06-04]{\GetIdInfo}
% \begin{syntax}
% |\RequirePackage{l3bootstrap}|
% \cs{GetIdInfo} |$Id:| \meta{SVN info field} |$| \Arg{description}
% \end{syntax}
% Extracts all information from a SVN field. Spaces are not
% ignored in these fields. The information pieces are stored in
% separate control sequences with \cs{ExplFileName} for the part of the
% file name leading up to the period, \cs{ExplFileDate} for date,
% \cs{ExplFileVersion} for version and \cs{ExplFileDescription} for the
% description.
% \end{function}
%
% To summarize: Every single package using this syntax should identify
% itself using one of the above methods. Special care is taken so that
% every package or class file loaded with \tn{RequirePackage} or alike
% are loaded with usual \LaTeXe{} category codes and the \LaTeX3 category code
% scheme is reloaded when needed afterwards. See implementation for
% details. If you use the \cs{GetIdInfo} command you can use the
% information when loading a package with
% \begin{verbatim}
% \ProvidesExplPackage{\ExplFileName}
% {\ExplFileDate}{\ExplFileVersion}{\ExplFileDescription}
% \end{verbatim}
%
% \subsection{Internal functions and variables}
%
% \begin{variable}{\l__kernel_expl_bool}
% A boolean which records the current code syntax status: \texttt{true} if
% currently inside a code environment. This variable should only be
% set by \cs{ExplSyntaxOn}/\cs{ExplSyntaxOff}.
% \end{variable}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3bootstrap} implementation}
%
% \begin{macrocode}
%<*initex|package>
%<@@=expl>
% \end{macrocode}
%
% \subsection{Format-specific code}
%
% The very first thing to do is to bootstrap the \IniTeX{} system so
% that everything else will actually work. \TeX{} does not start with
% some pretty basic character codes set up.
% \begin{macrocode}
%<*initex>
\catcode `\{ = 1 \relax
\catcode `\} = 2 \relax
\catcode `\# = 6 \relax
\catcode `\^ = 7 \relax
%</initex>
% \end{macrocode}
%
% Tab characters should not show up in the code, but to be on the
% safe side.
% \begin{macrocode}
%<*initex>
\catcode `\^^I = 10 \relax
%</initex>
% \end{macrocode}
%
% For \LuaTeX{}, the extra primitives need to be enabled. This is not needed
% in package mode: plain \TeX{} and Con\TeX{}t have the primitives enabled
% while \LaTeXe{} has them with the prefix \texttt{luatex} (which is handled
% in \pkg{l3names}).
% \begin{macrocode}
%<*initex>
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname directlua\endcsname\relax
\else
\directlua{tex.enableprimitives("", tex.extraprimitives())}
\fi
%</initex>
% \end{macrocode}
%
% Depending on the versions available, the \LaTeX{} format may not have
% the raw |\Umath| primitive names available. We fix that globally:
% it should cause no issues. Older \LuaTeX{} versions do not have
% a pre-built table of the primitive names here so sort one out
% ourselves. These end up globally-defined but at that is true with
% a newer format anyway and as they all start |\U| this should be
% reasonably safe.
% \begin{macrocode}
%<*package>
\begingroup
\expandafter\ifx\csname directlua\endcsname\relax
\else
\directlua{%
local i
local t = { }
for _,i in pairs(tex.extraprimitives("luatex")) do
if string.match(i,"^U") then
if not string.match(i,"^Uchar$") then
table.insert(t,i)
end
end
end
tex.enableprimitives("", t)
}%
\fi
\endgroup
%</package>
% \end{macrocode}
%
% \subsection{The \tn{pdfstrcmp} primitive with \XeTeX{} and \LuaTeX{}}
%
% Only \pdfTeX{} has a primitive called \tn{pdfstrcmp}. The \XeTeX{}
% version is just \tn{strcmp}, so there is some shuffling to do. As
% this is still a real primitive, using the \pdfTeX{} name is \enquote{safe}.
% \begin{macrocode}
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname pdfstrcmp\endcsname\relax
\let\pdfstrcmp\strcmp
\fi
% \end{macrocode}
%
% If \LuaTeX{} is in use then no primitive \tn{pdfstrcmp} is available.
% However, it can be emulated using some Lua code. In earlier versions of
% the code, the \pkg{pdftexcmds} package was loaded to do this task. However,
% that raises some issues in \enquote{generic} (it fails with Con\TeX{}t
% MkIV), and also adds a hardly-needed dependency. Note that \LuaTeX{}
% prior to version $0.36$ is not supported by \pkg{expl3}: here that means
% simply skipping the definition, which will then be picked up later. This
% definition may need to be done twice: one \enquote{now} and once at the
% start of every job. The latter can occur in package mode if for example a
% custom format is being constructed. To achieve this while not requiring a
% separate file, the Lua code is saved into a macro then used twice.
% (In the long term, the Lua code here may be best moved to a separate
% file.)
%
% No macro definition is given just yet: that is left until \pkg{l3basics}.
% \begin{macrocode}
\begingroup
\expandafter\ifx\csname directlua\endcsname\relax
\else
\ifnum\luatexversion<36 %
\else
\catcode`\_=11 %
\catcode`\:=11 %
\def\tempa
{%
l3kernel = l3kernel or { }
function l3kernel.strcmp(A, B)
if A == B then
tex.write("0")
elseif A < B then
tex.write("-1")
else
tex.write("1")
end
end
}
\directlua{\tempa}
% \end{macrocode}
% A test for \LuaTeX{} in Ini\TeX{} mode.
% \begin{macrocode}
\ifnum 0%
\directlua
{%
if status.ini_version then
tex.write("1")
end
}>0 %
\global\everyjob\expandafter
{%
\the\expandafter\everyjob
\expandafter\luatex_directlua:D\expandafter{\tempa}%
}
\fi
\fi
\fi
\endgroup
% \end{macrocode}
%
% \subsection{Engine requirements}
%
% The code currently requires functionality equivalent to \tn{pdfstrcmp}
% in addition to \eTeX{}. This is picked up by testing for the \tn{pdfstrcmp}
% primitive or a version of \LuaTeX{} capable of emulating it.
% \begin{macrocode}
\begingroup
\def\next{\endgroup}%
\def\ShortText{Required primitives not found}%
\def\LongText%
{%
LaTeX3 requires the e-TeX primitives and \string\pdfstrcmp.\LineBreak
\LineBreak
These are available in engine versions:\LineBreak
- pdfTeX 1.30\LineBreak
- XeTeX 0.9994\LineBreak
- LuaTeX 0.40\LineBreak
or later.\LineBreak
\LineBreak
}%
\ifnum0%
\expandafter\ifx\csname pdfstrcmp\endcsname\relax\else 1\fi
\expandafter\ifx\csname directlua\endcsname\relax
\else
\ifnum\luatexversion<36 \else 1\fi
\fi
=0 %
\newlinechar`\^^J %
%<*initex>
\def\LineBreak{^^J}%
\edef\next
{%
\errhelp
{%
\LongText
For pdfTeX and XeTeX the '-etex' command-line switch is also
needed.\LineBreak
\LineBreak
Format building will abort!\LineBreak
}%
\errmessage{\ShortText}%
\endgroup
\noexpand\end
}%
%</initex>
%<*package>
\def\LineBreak{\noexpand\MessageBreak}%
\expandafter\ifx\csname PackageError\endcsname\relax
\def\LineBreak{^^J}%
\def\PackageError#1#2#3%
{%
\errhelp{#3}%
\errmessage{#1 Error: #2}
}%
\fi
\edef\next
{%
\noexpand\PackageError{expl3}{\ShortText}
{\LongText Loading of expl3 will abort!}%
\endgroup
\noexpand\endinput
}%
%</package>
\fi
\next
% \end{macrocode}
%
% \subsection{Extending allocators}
%
% In format mode, allocating registers is handled by \pkg{l3alloc}. However, in
% package mode it's much safer to rely on more general code. For example,
% the ability to extend \TeX{}'s allocation routine to allow for \eTeX{} has
% been around since 1997 in the \pkg{etex} package.
%
% Loading this support is delayed until here as we are now sure that the
% \eTeX{} extensions and \tn{pdfstrcmp} or equivalent are available. Thus
% there is no danger of an \enquote{uncontrolled} error if the engine
% requirements are not met.
%
% For \LaTeXe{} we need to make sure that the extended pool is being used:
% \pkg{expl3} uses a lot of registers. For formats from 2015 onward there is
% nothing to do as this is automatic. For older formats, the \pkg{etex}
% package needs to be loaded to do the job. In that case, some inserts are
% reserved also as these have to be from the standard pool. Note that
% \tn{reserveinserts} is \tn{outer} and so is accessed here by csname. In
% earlier versions, loading \pkg{etex} was done directly and so
% \tn{reserveinserts} appeared in the code: this then required a \tn{relax}
% after \tn{RequirePackage} to prevent an error with \enquote{unsafe}
% definitions as seen for example with \pkg{capoptions}. The optional loading
% here is done using a group and \tn{ifx} test as we are not quite in the
% position to have a single name for \tn{pdfstrcmp} just yet.
% \begin{macrocode}
%<*package>
\begingroup
\def\@tempa{LaTeX2e}
\def\next{}
\ifx\fmtname\@tempa
\unless\ifdefined\extrafloats
\def\next
{%
\RequirePackage{etex}%
\csname reserveinserts\endcsname{32}%
}
\fi
\fi
\expandafter\endgroup
\next
%</package>
% \end{macrocode}
%
% \subsection{The \LaTeX3 code environment}
%
% The code environment is now set up.
%
% \begin{macro}{\ExplSyntaxOff}
% Before changing any category codes, in package mode we need to save
% the situation before loading. Note the set up here means that once applied
% \cs{ExplSyntaxOff} will be a \enquote{do nothing} command until
% \cs{ExplSyntaxOn} is used. For format mode, there is no need to save
% category codes so that step is skipped.
% \begin{macrocode}
\protected\def\ExplSyntaxOff{}
%<*package>
\protected\edef\ExplSyntaxOff
{%
\protected\def\ExplSyntaxOff{}%
\catcode 9 = \the\catcode 9\relax
\catcode 32 = \the\catcode 32\relax
\catcode 34 = \the\catcode 34\relax
\catcode 38 = \the\catcode 38\relax
\catcode 58 = \the\catcode 58\relax
\catcode 94 = \the\catcode 94\relax
\catcode 95 = \the\catcode 95\relax
\catcode 124 = \the\catcode 124\relax
\catcode 126 = \the\catcode 126\relax
\endlinechar = \the\endlinechar\relax
\chardef\csname\detokenize{l__kernel_expl_bool}\endcsname = 0\relax
}
%</package>
% \end{macrocode}
% \end{macro}
%
% The code environment is now set up.
% \begin{macrocode}
\catcode 9 = 9\relax
\catcode 32 = 9\relax
\catcode 34 = 12\relax
\catcode 58 = 11\relax
\catcode 94 = 7\relax
\catcode 95 = 11\relax
\catcode 124 = 12\relax
\catcode 126 = 10\relax
\endlinechar = 32\relax
% \end{macrocode}
%
% \begin{variable}{\l__kernel_expl_bool}
% The status for experimental code syntax: this is on at present.
% \begin{macrocode}
\chardef\l__kernel_expl_bool = 1 ~
% \end{macrocode}
%\end{variable}
%
% \begin{macro}{\ExplSyntaxOn}
% The idea here is that multiple \cs{ExplSyntaxOn} calls are not
% going to mess up category codes, and that multiple calls to
% \cs{ExplSyntaxOff} are also not wasting time. Applying
% \cs{ExplSyntaxOn} will alter the definition of \cs{ExplSyntaxOff}
% and so in package mode this function should not be used until after
% the end of the loading process!
% \begin{macrocode}
\protected \def \ExplSyntaxOn
{
\bool_if:NF \l__kernel_expl_bool
{
\cs_set_protected_nopar:Npx \ExplSyntaxOff
{
\char_set_catcode:nn { 9 } { \char_value_catcode:n { 9 } }
\char_set_catcode:nn { 32 } { \char_value_catcode:n { 32 } }
\char_set_catcode:nn { 34 } { \char_value_catcode:n { 34 } }
\char_set_catcode:nn { 38 } { \char_value_catcode:n { 38 } }
\char_set_catcode:nn { 58 } { \char_value_catcode:n { 58 } }
\char_set_catcode:nn { 94 } { \char_value_catcode:n { 94 } }
\char_set_catcode:nn { 95 } { \char_value_catcode:n { 95 } }
\char_set_catcode:nn { 124 } { \char_value_catcode:n { 124 } }
\char_set_catcode:nn { 126 } { \char_value_catcode:n { 126 } }
\tex_endlinechar:D =
\tex_the:D \tex_endlinechar:D \scan_stop:
\bool_set_false:N \l__kernel_expl_bool
\cs_set_protected_nopar:Npn \ExplSyntaxOff { }
}
}
\char_set_catcode_ignore:n { 9 } % tab
\char_set_catcode_ignore:n { 32 } % space
\char_set_catcode_other:n { 34 } % double quote
\char_set_catcode_alignment:n { 38 } % ampersand
\char_set_catcode_letter:n { 58 } % colon
\char_set_catcode_math_superscript:n { 94 } % circumflex
\char_set_catcode_letter:n { 95 } % underscore
\char_set_catcode_other:n { 124 } % pipe
\char_set_catcode_space:n { 126 } % tilde
\tex_endlinechar:D = 32 \scan_stop:
\bool_set_true:N \l__kernel_expl_bool
}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
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