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authorNorbert Preining <norbert@preining.info>2019-12-18 03:01:19 +0000
committerNorbert Preining <norbert@preining.info>2019-12-18 03:01:19 +0000
commit6d3d0706f9b7085f8bc6efa81398dbfe551272db (patch)
tree46f604191e8b84eb8f939a14f2bfc5fd795dddd9 /macros/latex/contrib/ltxcmds
parent6cbf49c3ed1a2881b7fccbc67eccb5532d196b74 (diff)
CTAN sync 201912180301
Diffstat (limited to 'macros/latex/contrib/ltxcmds')
-rw-r--r--macros/latex/contrib/ltxcmds/README.md10
-rw-r--r--macros/latex/contrib/ltxcmds/ltxcmds.dtx2425
-rw-r--r--macros/latex/contrib/ltxcmds/ltxcmds.pdfbin0 -> 393914 bytes
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diff --git a/macros/latex/contrib/ltxcmds/README.md b/macros/latex/contrib/ltxcmds/README.md
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--- /dev/null
+++ b/macros/latex/contrib/ltxcmds/README.md
@@ -0,0 +1,10 @@
+# ltxcmds
+
+ltxcmds package for latex
+
+
+
+The package ltxcmds exports some utility macros
+from the LaTeX kernel into a separate namespace and
+also provides them for other formats such as plain-TeX.
+
diff --git a/macros/latex/contrib/ltxcmds/ltxcmds.dtx b/macros/latex/contrib/ltxcmds/ltxcmds.dtx
new file mode 100644
index 0000000000..f9169a21db
--- /dev/null
+++ b/macros/latex/contrib/ltxcmds/ltxcmds.dtx
@@ -0,0 +1,2425 @@
+% \iffalse meta-comment
+%
+% File: ltxcmds.dtx
+% Version: 2019/12/15 v1.24
+% Info: LaTeX kernel commands for general use
+%
+% Copyright (C)
+% 2009-2011 Heiko Oberdiek
+% 2016-2019 Oberdiek Package Support Group
+% https://github.com/ho-tex/ltxcmds/issues
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either
+% version 1.3c of this license or (at your option) any later
+% version. This version of this license is in
+% https://www.latex-project.org/lppl/lppl-1-3c.txt
+% and the latest version of this license is in
+% https://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of
+% LaTeX version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status "maintained".
+%
+% The Current Maintainers of this work are
+% Heiko Oberdiek and the Oberdiek Package Support Group
+% https://github.com/ho-tex/ltxcmds/issues
+%
+% The Base Interpreter refers to any `TeX-Format',
+% because some files are installed in TDS:tex/generic//.
+%
+% This work consists of the main source file ltxcmds.dtx
+% and the derived files
+% ltxcmds.sty, ltxcmds.pdf, ltxcmds.ins, ltxcmds.drv,
+% ltxcmds-test1.tex, ltxcmds-test-gobble.tex,
+% ltxcmds-test-ifempty.tex, ltxcmds-test-zapspace.tex,
+% ltxcmds-test-ifboxempty.tex, ltxcmds-test-nextchar.tex,
+% ltxcmds-test-carcdr.tex.
+%
+% Distribution:
+% CTAN:macros/latex/contrib/ltxcmds/ltxcmds.dtx
+% CTAN:macros/latex/contrib/ltxcmds/ltxcmds.pdf
+%
+% Unpacking:
+% (a) If ltxcmds.ins is present:
+% tex ltxcmds.ins
+% (b) Without ltxcmds.ins:
+% tex ltxcmds.dtx
+% (c) If you insist on using LaTeX
+% latex \let\install=y\input{ltxcmds.dtx}
+% (quote the arguments according to the demands of your shell)
+%
+% Documentation:
+% (a) If ltxcmds.drv is present:
+% latex ltxcmds.drv
+% (b) Without ltxcmds.drv:
+% latex ltxcmds.dtx; ...
+% The class ltxdoc loads the configuration file ltxdoc.cfg
+% if available. Here you can specify further options, e.g.
+% use A4 as paper format:
+% \PassOptionsToClass{a4paper}{article}
+%
+% Programm calls to get the documentation (example):
+% pdflatex ltxcmds.dtx
+% makeindex -s gind.ist ltxcmds.idx
+% pdflatex ltxcmds.dtx
+% makeindex -s gind.ist ltxcmds.idx
+% pdflatex ltxcmds.dtx
+%
+% Installation:
+% TDS:tex/generic/ltxcmds/ltxcmds.sty
+% TDS:doc/latex/ltxcmds/ltxcmds.pdf
+% TDS:source/latex/ltxcmds/ltxcmds.dtx
+%
+%<*ignore>
+\begingroup
+ \catcode123=1 %
+ \catcode125=2 %
+ \def\x{LaTeX2e}%
+\expandafter\endgroup
+\ifcase 0\ifx\install y1\fi\expandafter
+ \ifx\csname processbatchFile\endcsname\relax\else1\fi
+ \ifx\fmtname\x\else 1\fi\relax
+\else\csname fi\endcsname
+%</ignore>
+%<*install>
+\input docstrip.tex
+\Msg{************************************************************************}
+\Msg{* Installation}
+\Msg{* Package: ltxcmds 2019/12/15 v1.24 LaTeX kernel commands for general use (HO)}
+\Msg{************************************************************************}
+
+\keepsilent
+\askforoverwritefalse
+
+\let\MetaPrefix\relax
+\preamble
+
+This is a generated file.
+
+Project: ltxcmds
+Version: 2019/12/15 v1.24
+
+Copyright (C)
+ 2009-2011 Heiko Oberdiek
+ 2016-2019 Oberdiek Package Support Group
+
+This work may be distributed and/or modified under the
+conditions of the LaTeX Project Public License, either
+version 1.3c of this license or (at your option) any later
+version. This version of this license is in
+ https://www.latex-project.org/lppl/lppl-1-3c.txt
+and the latest version of this license is in
+ https://www.latex-project.org/lppl.txt
+and version 1.3 or later is part of all distributions of
+LaTeX version 2005/12/01 or later.
+
+This work has the LPPL maintenance status "maintained".
+
+The Current Maintainers of this work are
+Heiko Oberdiek and the Oberdiek Package Support Group
+https://github.com/ho-tex/ltxcmds/issues
+
+
+The Base Interpreter refers to any `TeX-Format',
+because some files are installed in TDS:tex/generic//.
+
+This work consists of the main source file ltxcmds.dtx
+and the derived files
+ ltxcmds.sty, ltxcmds.pdf, ltxcmds.ins, ltxcmds.drv,
+ ltxcmds-test1.tex, ltxcmds-test-gobble.tex,
+ ltxcmds-test-ifempty.tex, ltxcmds-test-zapspace.tex,
+ ltxcmds-test-ifboxempty.tex, ltxcmds-test-nextchar.tex,
+ ltxcmds-test-carcdr.tex.
+
+\endpreamble
+\let\MetaPrefix\DoubleperCent
+
+\generate{%
+ \file{ltxcmds.ins}{\from{ltxcmds.dtx}{install}}%
+ \file{ltxcmds.drv}{\from{ltxcmds.dtx}{driver}}%
+ \usedir{tex/generic/ltxcmds}%
+ \file{ltxcmds.sty}{\from{ltxcmds.dtx}{package}}%
+}
+
+\catcode32=13\relax% active space
+\let =\space%
+\Msg{************************************************************************}
+\Msg{*}
+\Msg{* To finish the installation you have to move the following}
+\Msg{* file into a directory searched by TeX:}
+\Msg{*}
+\Msg{* ltxcmds.sty}
+\Msg{*}
+\Msg{* To produce the documentation run the file `ltxcmds.drv'}
+\Msg{* through LaTeX.}
+\Msg{*}
+\Msg{* Happy TeXing!}
+\Msg{*}
+\Msg{************************************************************************}
+
+\endbatchfile
+%</install>
+%<*ignore>
+\fi
+%</ignore>
+%<*driver>
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesFile{ltxcmds.drv}%
+ [2019/12/15 v1.24 LaTeX kernel commands for general use (HO)]%
+\documentclass{ltxdoc}
+\usepackage{holtxdoc}[2011/11/22]
+\usepackage{zref-savepos}
+\usepackage{paralist}
+\hfuzz=1pt
+\begin{document}
+ \DocInput{ltxcmds.dtx}%
+\end{document}
+%</driver>
+% \fi
+%
+%
+%
+% \GetFileInfo{ltxcmds.drv}
+%
+% \title{The \xpackage{ltxcmds} package}
+% \date{2019/12/15 v1.24}
+% \author{Heiko Oberdiek\thanks
+% {Please report any issues at \url{https://github.com/ho-tex/ltxcmds/issues}}}
+%
+% \maketitle
+%
+% \begin{abstract}
+% The package \xpackage{ltxcmds} exports some utility macros
+% from the \LaTeX\ kernel into a separate namespace and
+% also provides them for other formats such as plain-\TeX.
+% \end{abstract}
+%
+% \tableofcontents
+%
+% \newcounter{to}
+% \renewcommand*{\theto}{to\arabic{to}}
+% \newlength\tolength
+% \tolength=\dimexpr .5\linewidth+\oddsidemargin+1in+15mm\relax
+% \newcommand*{\TO}{^^A
+% \quad
+% \stepcounter{to}^^A
+% \zsavepos\theto
+% \ifdim\zposx\theto sp>0pt
+% \ifdim\zposx\theto sp<\tolength
+% \kern\dimexpr\tolength-\zposx\theto sp\relax
+% \fi
+% \fi
+% $\rightarrow$\quad
+% \ignorespaces
+% }
+%
+% \section{Documentation}
+%
+% \subsection{Introduction}
+%
+% Many of my packages also support other formats such as plain-\TeX.
+% Because I am rather familiar with the utility macros from
+% \LaTeX's kernel (e.g. \cs{@gobble}, \cs{@firstoftwo}), I found
+% myself rewriting them again and again, because they are lacking
+% in plain-\TeX.
+%
+% Therefore this package provides often used macros and similar
+% ones with the name prefix \cs{ltx@}. This avoids also faulty
+% redefinitions. I remember an example where a package redefined
+% \cs{@firstoftwo} with forgetting \cs{long}.
+%
+% \subsection{Numbers}
+%
+% \begin{declcs}{ltx@zero} \TO 0\\
+% \cs{ltx@one} \TO 1\\
+% \cs{ltx@two} \TO 2\\
+% \cs{ltx@cclv} \TO 255\\
+% \cs{ltx@minusone} \TO -1
+% \end{declcs}
+% These commands are numbers 0, 1, 2, 255 and -1. They are not digits
+% and a space is not gobbled afterwards. Macro \cs{ltx@minusone}
+% is available since version 2010/12/12 v1.15.
+%
+% \subsection{Scratch registers}
+%
+% Following the conventions of \hologo{plainTeX} and \hologo{LaTeX}
+% the first ten registers are free to use. Even numbered registers
+% are for local, odd numbered for global use.
+%
+% \begin{declcs}{ltx@(Loc,Glob)(Toks,Dimen,Skip)(A,B,C,D,E)}
+% \end{declcs}
+% The name consists of the prefix \cs{ltx@}, then
+% \texttt{Loc} or \texttt{Glob} for local or global usage follows.
+% The register type is given by \texttt{Toks} for token register,
+% \texttt{Dimen} for dimen register and \texttt{Skip} for skip
+% register. As last part the registers are numbered from \texttt{A}
+% to \texttt{E}. Example: \cs{ltx@LocToksA}.
+%
+% Since 2011/04/14 v1.19.
+%
+% \subsection{Argument killers}
+%
+% \begin{declcs}{ltx@gobble} \M{1} \TO\\
+% \cs{ltx@gobbletwo} \M{1} \M{2} \TO\\
+% \cs{ltx@gobblethree} \M{1} \M{2} \M{3} \TO\\
+% \cs{ltx@gobblefour} \M{1} \M{2} \M{3} \M{4} \TO
+% \end{declcs}
+%
+% \begin{declcs}{ltx@GobbleNum} \M{num} \M{1} \M{2} \dots\space
+% \M{\meta{num}} \TO
+% \end{declcs}
+% The first argument \meta{num} of macro \cs{ltx@GobbleNum} specifies,
+% how many following arguments are eaten. Macro \cs{ltx@GobbleNum}
+% is expandable in exact two expansion steps.
+%
+% \subsection{Argument grabbers}
+%
+% \begin{declcs}{ltx@firstofone} \M{1} \TO \meta{1}\\[1ex]
+% \cs{ltx@firstoftwo} \M{1} \M{2} \TO \meta{1}\\
+% \cs{ltx@secondoftwo} \M{1} \M{2} \TO \meta{2}\\[1ex]
+% \cs{ltx@firstofthree} \M{1} \M{2} \M{3} \TO \meta{1}\\
+% \cs{ltx@secondofthree} \M{1} \M{2} \M{3} \TO \meta{2}\\
+% \cs{ltx@thirdofthree} \M{1} \M{2} \M{3} \TO \meta{3}\\
+% \cs{ltx@firstoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{1}\\
+% \cs{ltx@secondoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{2}\\
+% \cs{ltx@thirdoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{3}\\
+% \cs{ltx@fourthoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{4}
+% \end{declcs}
+% Macros \cs{ltx@firstofthree}, \cs{ltx@secondofthree}
+% and \cs{ltx@thirdofthree} were added in version
+% 2010/11/12 v1.11.
+% Macros \cs{ltx@firstoffour}, \dots, \cs{ltx@fourthoffour}
+% were added in version 2011/02/04 v1.16.
+%
+% \subsection{List helpers}
+%
+% \begin{declcs}{ltx@carzero} \dots\ \cs{@nil} \TO\\
+% \cs{ltx@cdrzero} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx@car} \M{1} \dots\ \cs{@nil} \TO \meta{1}\\
+% \cs{ltx@cdr} \M{1} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx@cartwo} \M{1} \M{2} \dots\ \cs{@nil}
+% \TO \meta{1}\meta{2}\\
+% \cs{ltx@carsecond} \M{1} \M{2} \dots\ \cs{@nil} \TO \meta{2}\\
+% \cs{ltx@cdrtwo} \M{1} \M{2} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx@carthree} \M{1} \M{2} \M{3} \dots\ \cs{@nil}
+% \TO \meta{1}\meta{2}\meta{3}\\
+% \cs{ltx@carthird} \M{1} \M{2} \M{3} \dots\ \cs{@nil}
+% \TO \meta{3}\\
+% \cs{ltx@cdrthree} \M{1} \M{2} \M{3} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx@carfour} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil}
+% \TO \meta{1}\meta{2}\meta{3}\meta{4}\\
+% \cs{ltx@carfourth} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil}
+% \TO \meta{4}\\
+% \cs{ltx@cdrfour} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx@CarNum} \M{num} \M{1} \dots\ \M{\meta{num}}
+% \M{\meta{num}+1} \dots\ \cs{@nil}\\
+% \TO \M{1} \dots\ \M{\meta{num}} \dots\\
+% \cs{ltx@CarNumth} \M{num} \M{1} \dots\ \M{\meta{num}}
+% \M{\meta{num}+1} \dots\ \cs{@nil}\\
+% \TO \M{\meta{num}} \dots\\
+% \cs{ltx@CdrNum} \M{num} \M{1} \dots\ \M{\meta{num}}
+% \M{\meta{num}+1} \dots\ \cs{@nil}\\
+% \TO \M{\meta{num}+1} \dots
+% \end{declcs}
+%
+% Macros with uppercase letters are expandable in two expansion steps.
+% Changes in version 2019/12/15 v1.24:
+% \begin{itemize}
+% \item
+% Macros \cs{ltx@carsecond}, \cs{ltx@carthird}, \cs{ltx@carfourth},
+% \cs{ltx@CarNumth} added.
+% \item
+% Macros \cs{ltx@cdr}, \cs{ltx@cdrtwo}, \cs{ltx@cdrthree}, \cs{ltx@cdrfour},
+% \cs{ltx@CdrNum} are expandable in two expansion steps and retain
+% spaces and braces after the first gobbled arguments.
+% \end{itemize}
+%
+% \subsection{Tail recursion}
+%
+% \begin{declcs}{ltx@ReturnAfterFi} \M{1} \cs{fi} \TO \cs{fi} \meta{1}\\
+% \cs{ltx@ReturnAfterElseFi} \M{1} \cs{else} \M{2} \cs{fi}
+% \TO \cs{fi} \meta{1}
+% \end{declcs}
+%
+% \subsection{Empty macro}
+%
+% \begin{declcs}{ltx@empty} \TO
+% \end{declcs}
+%
+% \subsection{Characters}
+%
+% \begin{declcs}{ltx@space} \TO \verb*| |\\
+% \cs{ltx@percentchar} \TO \texttt{\%}\\
+% \cs{ltx@backslashchar} \TO
+% \makeatletter\texttt{\@backslashchar}\\
+% \cs{ltx@hashchar} \TO \texttt{\#}\qquad(since v1.7)\\
+% \cs{ltx@leftbracechar} \TO \texttt{\textbraceleft}\qquad(since v1.8)\\
+% \cs{ltx@rightbracechar} \TO \texttt{\textbraceright}\qquad(since v1.8)
+% \end{declcs}
+%
+% \subsection{Boolean switch}
+%
+% \begin{declcs}{ltx@newif} \M{cmd}
+% \end{declcs}
+% \cs{ltx@newif} defines a new boolean switch \meta{cmd} like \cs{newif}.
+% Unlike \plainTeX's \cs{newif}, \cs{ltx@newif} is not \cs{outer}.
+% The command \meta{cmd} must start with the two characters |if|.
+%
+% \begin{declcs}{ltx@newglobalif} \M{cmd}
+% \end{declcs}
+% \cs{ltx@newglobalif} defines a new boolean switch \meta{cmd}
+% like \cs{ltx@newif}. However the switch setting commands,
+% \meta{cmd} without the prefix |if| and followed by |true| or |false|
+% are acting globally.
+%
+% \subsection{Command definitions}
+%
+% \begin{declcs}{ltx@ifundefined} \M{cmd} \M{yes} \M{no}
+% \end{declcs}
+% If \eTeX\ is available, \cs{ifcsname} is used that does
+% not have the side effect of defining undefined commands
+% with meaning of \cs{relax}. This command is always expandable.
+% Change in version 1.1: Also the meaning \cs{relax} is
+% always considered ``undefined''.
+%
+% \begin{declcs}{ltx@IfUndefined} \M{cmd} \M{yes} \M{no}
+% \end{declcs}
+% If \eTeX\ is available, \cs{ifcsname} is used that does
+% not have the side effect of defining undefined commands
+% with meaning of \cs{relax}. Also it always checks for
+% the meaning of \cs{relax} and considers this as undefined.
+% This macro is not expandable without \eTeX.
+%
+% \begin{declcs}{ltx@LocalExpandAfter}
+% \end{declcs}
+% It expands the token after the next token but in a local
+% context. That is the difference to \cs{expandafter}.
+% The local context discards the side effect of \cs{csname}
+% and let the command undefined after the expansion step.
+%
+% \subsection{Stripping}
+%
+% \begin{declcs}{ltx@RemovePrefix}\\
+% \cs{ltx@StripPrefix}
+% \end{declcs}
+% All tokens up to and including the next available character
+% `\textgreater' are thrown away. Usually it is used to strip
+% the first part of the output of the commands \cs{meaning}
+% or \cs{pdflastmatch}. Macro \cs{ltx@RemovePrefix}
+% has the same meaning as \LaTeX's \cs{strip@prefix}, whereas
+% macro \cs{ltx@StripPrefix} expands the next token
+% once before stripping the prefix.
+%
+% \begin{declcs}{ltx@onelevel@sanitize} \M{macro}
+% \end{declcs}
+% Macro \cs{ltx@onelevel@sanitize} provides \hologo{LaTeX}'s
+% \cs{@onelevel@sanitize}. The macro is expanded once and
+% the contents is converted to characters with catcode 12 (other)
+% and space tokens with catcode 10 (space). Then then sanitized
+% contents is stored into the macro again. Since version 1.12.
+%
+% \subsection{File management}
+%
+% All macros in this section are expandable like
+% the counterparts of the \LaTeX\ kernel. Also they
+% can be used after the preamble.
+%
+% \subsubsection{File extensions}
+%
+% \begin{declcs}{ltx@clsextension}\\
+% \cs{ltx@pkgextension}
+% \end{declcs}
+% Macros \cs{ltx@clsextension} and \cs{ltx@styextension}
+% stores the strings |cls| and |sty|. In opposite to \hologo{LaTeX}'s
+% \cs{@clsextension} and \cs{@styextension} they can also be
+% used after |\begin{document}|.
+%
+% \subsubsection{Load check}
+%
+% \begin{declcs}{ltx@ifclassloaded} \M{class} \M{yes} \M{no}\\
+% \cs{ltx@ifpackageloaded} \M{package} \M{yes} \M{no}
+% \end{declcs}
+% Macros \cs{ltx@ifclassloaded}\slash\cs{ltx@ifpackageloaded}
+% execute \meta{yes}, if the \meta{class} or \meta{package} is loaded,
+% otherwise \meta{no} is called.
+% Both \meta{class} and \meta{package} are specified without
+% extension. The macros can also be used after |\begin{document}|.
+%
+% \begin{declcs}{ltx@iffileloaded} \M{file} \M{yes} \M{no}
+% \end{declcs}
+% If \LaTeX's \cs{ProvidesFile} macro was called before
+% using \meta{file} as argument, then \cs{ltx@iffileloaded}
+% calls \meta{yes}, otherwise \meta{no}.
+% Therefore it is possible
+% that the \meta{file} is loaded, but \meta{no} is executed because
+% of a missing \cs{ProvidesFile}. The \LaTeX\ kernel does not have
+% a counterpart of \cs{ltx@iffileloaded}.
+%
+% Note that the file name used in \cs{ProvidesFile} and
+% \cs{ltx@iffileloaded} must match. For example, if \TeX's
+% default extension \xext{tex} was given in the first command,
+% then it must also specified in the latter command and vice versa.
+%
+% \subsubsection{Version date check}
+%
+% \begin{declcs}{ltx@ifclasslater} \M{class} \M{date} \M{yes} \M{no}\\
+% \cs{ltx@ifpackagelater} \M{package} \M{date} \M{yes} \M{no}\\
+% \cs{ltx@iffilelater} \M{file} \M{date} \M{yes} \M{no}
+% \end{declcs}
+% If a \cs{ProvidesClass}\slash\cs{ProvidesPackage}\slash
+% \cs{ProvidesFile} command with exact the same class\slash package\slash
+% file was executed before with an optional
+% argument that starts with a \LaTeX\ version date, then
+% this version date is compared with the argument \meta{date}.
+% If they are equal or if the version date is the later date,
+% then \meta{yes} is called. In all other cases \meta{no} is executed.
+%
+% A \LaTeX\ date has the format |YYYY/MM/DD| with |YYYY| as year
+% with four digits, |MM| as month with two digits and |DD| as day
+% with two digits. If \pdfTeX's \cs{pdfmatch} is available, then
+% it is used to detect the version date, to reject invalid
+% date formats and to reject some invalid dates.
+% Dates before 1994/01/01 are always invalid, because version
+% dates are introduced with \LaTeXe\ in 1994.
+%
+% \subsection{Macro additions}
+%
+% \begin{declcs}{ltx@GlobalAppendToMacro} \M{cmd} \M{addition}\\
+% \cs{ltx@LocalAppendToMacro} \M{cmd} \M{addition}
+% \end{declcs}
+% The \meta{addition} is appended to the parameterless macro \meta{cmd}.
+% If \meta{cmd} is undefined or has the meaning \cs{relax}, then
+% it will be initialized as empty macro beforehand. Due to a bug \meta{addition}
+% must not contain \cs{par} before version 2010/10/25 v1.9.
+%
+% \begin{declcs}{ltx@GlobalPrependToMacro} \M{cmd} \M{addition}\\
+% \cs{ltx@LocalPrependToMacro} \M{cmd} \M{addition}
+% \end{declcs}
+% The \meta{addition} is prepended to the parameterless macro \meta{cmd}.
+% If \meta{cmd} is undefined or has the meaning \cs{relax}, then
+% it will be initialized as empty macro beforehand. The macros
+% were added in version 2011/08/22 v1.21.
+%
+% \subsection{Next character detection}
+%
+% \begin{declcs}{ltx@ifnextchar} \M{char} \M{yes} \M{no}
+% \end{declcs}
+% If next character is \meta{char} then \meta{yes} is called,
+% otherwise \meta{no}. The character is not removed.
+% Spaces are silently removed when looking for \meta{char}
+% as \hologo{LaTeX}'s version \cs{kernel@ifnextchar} does.
+% But there are also small differences:
+% \begin{itemize}
+% \item The space can be used as \meta{char}. In this case
+% optional spaces before \meta{char} are not supported of course.
+% \item If the optional space is a command that is a character
+% (defined by \cs{let} or \cs{futurelet}), then
+% \cs{kernel@ifnextchar} breaks with an \hologo{TeX} error.
+% \cs{ltx@ifnextchar} silently removes this token as
+% optional space.
+% \end{itemize}
+% Since 2010/03/01 v1.3.
+%
+% \begin{declcs}{ltx@ifnextchar@nospace} \M{char} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx@ifnextchar@nospace} behaves like
+% macro \cs{ltx@ifnextchar} with the exception that
+% optional spaces are not supported before \meta{char}.
+% Since 2011/04/14 v1.19.
+%
+% \subsection{\cs{ltx@leavevmode}, \cs{ltx@mbox}}
+%
+% \begin{declcs}{ltx@leavevmode}
+% \end{declcs}
+% Macro \cs{ltx@leavevmode} calls \hologo{pdfTeX}'s \cs{quitvmode}.
+% Otherwise \cs{leavevmode} is used and defined if it is necessary.
+%
+% \begin{declcs}{ltx@mbox}
+% \end{declcs}
+% Macro \cs{ltx@mbox} reimplements \cs{mbox} with two changes.
+% Instead of \cs{leavevmode} it uses \cs{ltx@leavevmode} and
+% stops right after \cs{hbox}. Especially it does not grab
+% the argument and allows the extended syntax of \cs{hbox}.
+%
+% \subsection{Expandable test for emptiness}
+%
+% \begin{declcs}{ltx@ifempty} \M{stuff} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx@ifempty} checks in exact two expansion steps
+% whether \meta{stuff}
+% is empty or contains token. Depending on the result
+% \meta{yes} or \meta{no} is executed. The token in \meta{stuff}
+% may contain \cs{par} and unmatched conditionals (\cs{if}, \cs{else},
+% \cs{fi}, \dots). Since version 2010/11/12 v1.11.
+%
+% \begin{declcs}{ltx@ifblank} \M{stuff} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx@ifblank} tests in exact two expansion steps
+% if \meta{stuff} is empty or contain only blank spaces.
+% In this case argument \meta{yes} is called. If \meta{stuff}
+% contains other tokens than spaces then \meta{no} is executed.
+% Since version 2010/12/04 v1.13.
+%
+% \subsection{Stripping spaces}
+%
+% \begin{declcs}{ltx@zapspace} \M{stuff}
+% \end{declcs}
+% Macro \cs{ltx@zapspace} strips spaces from \meta{stuff}
+% that are not hidden inside curly braces. Like \hologo{LaTeX}'s
+% \cs{zap@space} it is expandable. Differences:
+% \begin{itemize}
+% \item
+% Syntax: \cs{zap@space} also expects a space token
+% and \cs{@empty} after \meta{stuff}.
+% \item
+% Macro \cs{ltx@zapspace} is expandable in exact two
+% expansion steps.
+% \item
+% Macro \cs{ltx@zapspace} always retains curly braces.
+% \item
+% Macro \cs{zap@space} has a bug. It stops stripping spaces
+% after a token group in curly braces if the first two tokens
+% inside the group are equal.
+% \item
+% Macro \cs{ltx@zapspace} also works with \cs{par}
+% and conditionals (\cs{if}, \cs{else}, \cs{fi}, \dots).
+% \end{itemize}
+% Macro \cs{ltx@zapspace} is available since version
+% 2010/12/07 v1.14.
+%
+% \subsection{Check for emptiness of boxes}
+%
+% \begin{declcs}{ltx@IfBoxEmpty} \M{box register number}
+% \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx@IfBoxEmpty} calls \meta{yes} if
+% the box exists (\cs{ifvoid} returns false) and the box
+% does not contain any content. Otherwise if the box
+% is void or contains something, then \meta{no} is executed.
+% Thus being empty means that the box exists and is either
+% an \cs{hbox} or a \cs{vbox} and may even have dimensions other than
+% 0.0\,pt, but the box does not contain anything.
+% Macro \cs{ltx@IfBoxEmpty} is available since 2010/02/04 v1.16.
+%
+% \begin{declcs}{ltx@IfBoxVoidOrEmpty} \M{box register number}
+% \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx@IfBoxVoidOrEmpty} calls \meta{yes} if
+% the box is either void or does not contain any content.
+% Otherwise \meta{no} is executed.
+% Macro \cs{ltx@IfBoxVoidOrEmpty} is available since 2010/02/04 v1.16.
+%
+% \StopEventually{
+% }
+%
+% \section{Implementation}
+%
+% \subsection{Identification}
+%
+% \begin{macrocode}
+%<*package>
+% \end{macrocode}
+% Reload check, especially if the package is not used with \LaTeX.
+% \begin{macrocode}
+\begingroup\catcode61\catcode48\catcode32=10\relax%
+ \catcode13=5 % ^^M
+ \endlinechar=13 %
+ \catcode35=6 % #
+ \catcode39=12 % '
+ \catcode44=12 % ,
+ \catcode45=12 % -
+ \catcode46=12 % .
+ \catcode58=12 % :
+ \catcode64=11 % @
+ \catcode123=1 % {
+ \catcode125=2 % }
+ \expandafter\let\expandafter\x\csname ver@ltxcmds.sty\endcsname
+ \ifx\x\relax % plain-TeX, first loading
+ \else
+ \def\empty{}%
+ \ifx\x\empty % LaTeX, first loading,
+ % variable is initialized, but \ProvidesPackage not yet seen
+ \else
+ \expandafter\ifx\csname PackageInfo\endcsname\relax
+ \def\x#1#2{%
+ \immediate\write-1{Package #1 Info: #2.}%
+ }%
+ \else
+ \def\x#1#2{\PackageInfo{#1}{#2, stopped}}%
+ \fi
+ \x{ltxcmds}{The package is already loaded}%
+ \aftergroup\endinput
+ \fi
+ \fi
+\endgroup%
+% \end{macrocode}
+% Package identification:
+% \begin{macrocode}
+\begingroup\catcode61\catcode48\catcode32=10\relax%
+ \catcode13=5 % ^^M
+ \endlinechar=13 %
+ \catcode35=6 % #
+ \catcode39=12 % '
+ \catcode40=12 % (
+ \catcode41=12 % )
+ \catcode44=12 % ,
+ \catcode45=12 % -
+ \catcode46=12 % .
+ \catcode47=12 % /
+ \catcode58=12 % :
+ \catcode64=11 % @
+ \catcode91=12 % [
+ \catcode93=12 % ]
+ \catcode123=1 % {
+ \catcode125=2 % }
+ \expandafter\ifx\csname ProvidesPackage\endcsname\relax
+ \def\x#1#2#3[#4]{\endgroup
+ \immediate\write-1{Package: #3 #4}%
+ \xdef#1{#4}%
+ }%
+ \else
+ \def\x#1#2[#3]{\endgroup
+ #2[{#3}]%
+ \ifx#1\@undefined
+ \xdef#1{#3}%
+ \fi
+ \ifx#1\relax
+ \xdef#1{#3}%
+ \fi
+ }%
+ \fi
+\expandafter\x\csname ver@ltxcmds.sty\endcsname
+\ProvidesPackage{ltxcmds}%
+ [2019/12/15 v1.24 LaTeX kernel commands for general use (HO)]%
+% \end{macrocode}
+%
+% \begin{macrocode}
+\begingroup\catcode61\catcode48\catcode32=10\relax%
+ \catcode13=5 % ^^M
+ \endlinechar=13 %
+ \catcode123=1 % {
+ \catcode125=2 % }
+ \catcode64=11 % @
+ \def\x{\endgroup
+ \expandafter\edef\csname LTXcmds@AtEnd\endcsname{%
+ \endlinechar=\the\endlinechar\relax
+ \catcode13=\the\catcode13\relax
+ \catcode32=\the\catcode32\relax
+ \catcode35=\the\catcode35\relax
+ \catcode61=\the\catcode61\relax
+ \catcode64=\the\catcode64\relax
+ \catcode123=\the\catcode123\relax
+ \catcode125=\the\catcode125\relax
+ }%
+ }%
+\x\catcode61\catcode48\catcode32=10\relax%
+\catcode13=5 % ^^M
+\endlinechar=13 %
+\catcode35=6 % #
+\catcode64=11 % @
+\catcode123=1 % {
+\catcode125=2 % }
+\def\TMP@EnsureCode#1#2{%
+ \edef\LTXcmds@AtEnd{%
+ \LTXcmds@AtEnd
+ \catcode#1=\the\catcode#1\relax
+ }%
+ \catcode#1=#2\relax
+}
+\TMP@EnsureCode{36}{3}% $
+\TMP@EnsureCode{38}{4}% &
+\TMP@EnsureCode{40}{12}% (
+\TMP@EnsureCode{41}{12}% )
+\TMP@EnsureCode{45}{12}% -
+\TMP@EnsureCode{46}{12}% .
+\TMP@EnsureCode{47}{12}% /
+\TMP@EnsureCode{60}{12}% <
+\TMP@EnsureCode{62}{12}% >
+\TMP@EnsureCode{91}{12}% [
+\TMP@EnsureCode{96}{12}% `
+\TMP@EnsureCode{93}{12}% ]
+\TMP@EnsureCode{94}{12}% ^ (superscript) (!)
+\TMP@EnsureCode{124}{12}% |
+\edef\LTXcmds@AtEnd{\LTXcmds@AtEnd\noexpand\endinput}
+% \end{macrocode}
+%
+% \subsection{Numbers}
+%
+% \begin{macro}{\ltx@zero}
+% \begin{macrocode}
+\chardef\ltx@zero=0 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@one}
+% \begin{macrocode}
+\chardef\ltx@one=1 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@two}
+% \begin{macrocode}
+\chardef\ltx@two=2 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@active}
+% \begin{macrocode}
+\chardef\ltx@active=13 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cclv}
+% \begin{macrocode}
+\chardef\ltx@cclv=255 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@minusone}
+% \begin{macrocode}
+\def\ltx@minusone{%
+ -\ltx@one
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Scratch registers}
+%
+% \begin{macro}{\ltx@LocToksA}
+% \begin{macrocode}
+\toksdef\ltx@LocToksA=0 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocToksB}
+% \begin{macrocode}
+\toksdef\ltx@LocToksB=2 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocToksC}
+% \begin{macrocode}
+\toksdef\ltx@LocToksC=4 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocToksD}
+% \begin{macrocode}
+\toksdef\ltx@LocToksD=6 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocToksE}
+% \begin{macrocode}
+\toksdef\ltx@LocToksE=8 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@GlobToksA}
+% \begin{macrocode}
+\toksdef\ltx@GlobToksA=1 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobToksB}
+% \begin{macrocode}
+\toksdef\ltx@GlobToksB=3 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobToksC}
+% \begin{macrocode}
+\toksdef\ltx@GlobToksC=5 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobToksD}
+% \begin{macrocode}
+\toksdef\ltx@GlobToksD=7 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobToksE}
+% \begin{macrocode}
+\toksdef\ltx@GlobToksE=9 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@LocDimenA}
+% \begin{macrocode}
+\dimendef\ltx@LocDimenA=0 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocDimenB}
+% \begin{macrocode}
+\dimendef\ltx@LocDimenB=2 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocDimenC}
+% \begin{macrocode}
+\dimendef\ltx@LocDimenC=4 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocDimenD}
+% \begin{macrocode}
+\dimendef\ltx@LocDimenD=6 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocDimenE}
+% \begin{macrocode}
+\dimendef\ltx@LocDimenE=8 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@GlobDimenA}
+% \begin{macrocode}
+\dimendef\ltx@GlobDimenA=1 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobDimenB}
+% \begin{macrocode}
+\dimendef\ltx@GlobDimenB=3 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobDimenC}
+% \begin{macrocode}
+\dimendef\ltx@GlobDimenC=5 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobDimenD}
+% \begin{macrocode}
+\dimendef\ltx@GlobDimenD=7 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobDimenE}
+% \begin{macrocode}
+\dimendef\ltx@GlobDimenE=9 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@LocSkipA}
+% \begin{macrocode}
+\skipdef\ltx@LocSkipA=0 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocSkipB}
+% \begin{macrocode}
+\skipdef\ltx@LocSkipB=2 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocSkipC}
+% \begin{macrocode}
+\skipdef\ltx@LocSkipC=4 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocSkipD}
+% \begin{macrocode}
+\skipdef\ltx@LocSkipD=6 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocSkipE}
+% \begin{macrocode}
+\skipdef\ltx@LocSkipE=8 %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@GlobSkipA}
+% \begin{macrocode}
+\skipdef\ltx@GlobSkipA=1 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobSkipB}
+% \begin{macrocode}
+\skipdef\ltx@GlobSkipB=3 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobSkipC}
+% \begin{macrocode}
+\skipdef\ltx@GlobSkipC=5 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobSkipD}
+% \begin{macrocode}
+\skipdef\ltx@GlobSkipD=7 %
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@GlobSkipE}
+% \begin{macrocode}
+\skipdef\ltx@GlobSkipE=9 %
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \subsection{Argument killers}
+%
+% \begin{macro}{\ltx@gobble}
+% \begin{macrocode}
+\long\def\ltx@gobble#1{}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@gobbletwo}
+% \begin{macrocode}
+\long\def\ltx@gobbletwo#1#2{}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@gobblethree}
+% \begin{macrocode}
+\long\def\ltx@gobblethree#1#2#3{}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@gobblefour}
+% \begin{macrocode}
+\long\def\ltx@gobblefour#1#2#3#4{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@GobbleNum}
+% \begin{macrocode}
+\def\ltx@GobbleNum#1{%
+ \romannumeral
+ \csname ltx@zero%
+ \expandafter\LTXcmds@GobbleNum
+ \romannumeral\LTXcmds@num{#1}000{m\endcsname}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@GobbleNum}
+% \begin{macrocode}
+\def\LTXcmds@GobbleNum#1{%
+ \csname LTXcmds@G#1\LTXcmds@GobbleNum
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@Gm}
+% \begin{macrocode}
+\long\def\LTXcmds@Gm#1{%
+ \endcsname
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Argument grabbers}
+%
+% \begin{macro}{\ltx@firstofone}
+% \begin{macrocode}
+\long\def\ltx@firstofone#1{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@firstoftwo}
+% \begin{macrocode}
+\long\def\ltx@firstoftwo#1#2{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@secondoftwo}
+% \begin{macrocode}
+\long\def\ltx@secondoftwo#1#2{#2}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@firstofthree}
+% \begin{macrocode}
+\long\def\ltx@firstofthree#1#2#3{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@secondofthree}
+% \begin{macrocode}
+\long\def\ltx@secondofthree#1#2#3{#2}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@thirdofthree}
+% \begin{macrocode}
+\long\def\ltx@thirdofthree#1#2#3{#3}%
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@firstoffour}
+% \begin{macrocode}
+\long\def\ltx@firstoffour#1#2#3#4{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@secondoffour}
+% \begin{macrocode}
+\long\def\ltx@secondoffour#1#2#3#4{#2}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@thirdoffour}
+% \begin{macrocode}
+\long\def\ltx@thirdoffour#1#2#3#4{#3}%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@fourthoffour}
+% \begin{macrocode}
+\long\def\ltx@fourthoffour#1#2#3#4{#4}%
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{List helpers}
+%
+% \begin{macro}{\ltx@carzero}
+% \begin{macrocode}
+\long\def\ltx@carzero#1\@nil{}%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@cdrzero}
+% \begin{macrocode}
+\long\def\LTXcmds@cdrzero#1\@nil{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cdrzero}
+% \begin{macrocode}
+\def\ltx@cdrzero{%
+ \romannumeral\LTXcmds@cdrzero\ltx@zero
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@car}
+% \begin{macrocode}
+\long\def\ltx@car#1#2\@nil{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cdr}
+% \begin{macrocode}
+\long\def\ltx@cdr#1{%
+ \romannumeral\LTXcmds@cdrzero\ltx@zero
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@cartwo}
+% \begin{macrocode}
+\long\def\ltx@cartwo#1#2#3\@nil{#1#2}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@carsecond}
+% \begin{macrocode}
+\long\def\ltx@carsecond#1#2#3\@nil{#2}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cdrtwo}
+% \begin{macrocode}
+\long\def\ltx@cdrtwo#1#2{%
+ \romannumeral\LTXcmds@cdrzero\ltx@zero
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@carthree}
+% \begin{macrocode}
+\long\def\ltx@carthree#1#2#3#4\@nil{#1#2#3}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@carthird}
+% \begin{macrocode}
+\long\def\ltx@carthird#1#2#3#4\@nil{#3}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cdrthree}
+% \begin{macrocode}
+\long\def\ltx@cdrthree#1#2#3{%
+ \romannumeral\LTXcmds@cdrzero\ltx@zero
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@carfour}
+% \begin{macrocode}
+\long\def\ltx@carfour#1#2#3#4#5\@nil{#1#2#3#4}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@carfourth}
+% \begin{macrocode}
+\long\def\ltx@carfourth#1#2#3#4#5\@nil{#4}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@cdrfour}
+% \begin{macrocode}
+\long\def\ltx@cdrfour#1#2#3#4{%
+ \romannumeral\LTXcmds@cdrzero\ltx@zero
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@CarNum}
+% \begin{macrocode}
+\def\ltx@CarNum#1{%
+ \romannumeral
+ \csname LTXcmds@CarNumFinish%
+ \expandafter\LTXcmds@CarNum
+ \romannumeral\LTXcmds@num{#1}000{x\endcsname}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@CarNum}
+% \begin{macrocode}
+\def\LTXcmds@CarNum#1{%
+ \csname LTXcmds@C#1\LTXcmds@CarNum
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@Cm}
+% \begin{macrocode}
+\long\def\LTXcmds@Cm#1#2{%
+ \endcsname{#1#2}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@Cx}
+% \begin{macrocode}
+\def\LTXcmds@Cx#1{%
+ \endcsname{}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@CarNumFinish}
+% \begin{macrocode}
+\long\def\LTXcmds@CarNumFinish#1#2\@nil{%
+ \ltx@zero
+ #1%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@CarNumth}
+% \begin{macrocode}
+\def\ltx@CarNumth#1{%
+ \romannumeral
+ \expandafter\expandafter\expandafter
+ \LTXcmds@CarNumth
+ \ltx@GobbleNum{#1}{}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@CarNumth}
+% \begin{macrocode}
+\long\def\LTXcmds@CarNumth#1#2\@nil{%
+ \ltx@zero
+ #1%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@CdrNum}
+% \begin{macrocode}
+\def\ltx@CdrNum#1{%
+ \romannumeral%
+ \expandafter\expandafter\expandafter\ltx@cdrzero
+ \expandafter\expandafter\expandafter\ltx@zero
+ \ltx@GobbleNum{#1}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Tail recursion}
+%
+% \begin{macro}{\ltx@ReturnAfterFi}
+% \begin{macrocode}
+\long\def\ltx@ReturnAfterFi#1\fi{\fi#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ReturnAfterElseFi}
+% \begin{macrocode}
+\long\def\ltx@ReturnAfterElseFi#1\else#2\fi{\fi#1}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Empty macro}
+%
+% \begin{macro}{\ltx@empty}
+% \begin{macrocode}
+\def\ltx@empty{}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Characters}
+%
+% \begin{macro}{\ltx@space}
+% \begin{macrocode}
+\def\ltx@space{ }
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@percentchar}
+% \begin{macrocode}
+\begingroup
+ \lccode`0=`\%\relax
+\lowercase{\endgroup
+ \def\ltx@percentchar{0}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@backslashchar}
+% \begin{macrocode}
+\begingroup
+ \lccode`0=`\\\relax
+\lowercase{\endgroup
+ \def\ltx@backslashchar{0}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@hashchar}
+% \begin{macrocode}
+\begingroup
+ \lccode`0=`\#\relax
+\lowercase{\endgroup
+ \def\ltx@hashchar{0}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@leftbracechar}
+% \begin{macrocode}
+\begingroup
+ \lccode`0=`\{\relax
+\lowercase{\endgroup
+ \def\ltx@leftbracechar{0}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@rightbracechar}
+% \begin{macrocode}
+\begingroup
+ \lccode`0=`\}\relax
+\lowercase{\endgroup
+ \def\ltx@rightbracechar{0}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Boolean switch}
+%
+% \begin{macro}{\ltx@newif}
+% \begin{macrocode}
+\def\ltx@newif#1{%
+ \begingroup
+ \escapechar=-1 %
+ \expandafter\endgroup
+ \expandafter\LTXcmds@newif\string#1\@nil
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@newif}
+% \begin{macrocode}
+\begingroup
+ \escapechar=-1 %
+\expandafter\endgroup
+\expandafter\def\expandafter\LTXcmds@newif\string\if#1\@nil{%
+ \expandafter\edef\csname#1true\endcsname{%
+ \let
+ \expandafter\noexpand\csname if#1\endcsname
+ \noexpand\iftrue
+ }%
+ \expandafter\edef\csname#1false\endcsname{%
+ \let
+ \expandafter\noexpand\csname if#1\endcsname
+ \noexpand\iffalse
+ }%
+ \csname#1false\endcsname
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@newglobalif}
+% \begin{macrocode}
+\def\ltx@newglobalif#1{%
+ \begingroup
+ \escapechar=-1 %
+ \expandafter\endgroup
+ \expandafter\LTXcmds@newglobalif\string#1\@nil
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@newglobalif}
+% \begin{macrocode}
+\begingroup
+ \escapechar=-1 %
+\expandafter\endgroup
+\expandafter
+\def\expandafter\LTXcmds@newglobalif\string\if#1\@nil{%
+ \expandafter\edef\csname#1true\endcsname{%
+ \global\let
+ \expandafter\noexpand\csname if#1\endcsname
+ \noexpand\iftrue
+ }%
+ \expandafter\edef\csname#1false\endcsname{%
+ \global\let
+ \expandafter\noexpand\csname if#1\endcsname
+ \noexpand\iffalse
+ }%
+ \csname#1false\endcsname
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Command definitions}
+%
+% \begin{macro}{\ltx@LocalExpandAfter}
+% \begin{macrocode}
+\def\ltx@LocalExpandAfter{%
+ \begingroup
+ \expandafter\expandafter\expandafter
+ \endgroup
+ \expandafter
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\ltx@LocalExpandAfter
+\ifx\csname ifcsname\endcsname\relax
+% \end{macrocode}
+% \begin{macro}{\ltx@ifundefined}
+% \begin{macrocode}
+ \def\ltx@ifundefined#1{%
+ \expandafter\ifx\csname #1\endcsname\relax
+ \expandafter\ltx@firstoftwo
+ \else
+ \expandafter\ltx@secondoftwo
+ \fi
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@IfUndefined}
+% \begin{macrocode}
+ \def\ltx@IfUndefined#1{%
+ \begingroup\expandafter\expandafter\expandafter\endgroup
+ \expandafter\ifx\csname #1\endcsname\relax
+ \expandafter\ltx@firstoftwo
+ \else
+ \expandafter\ltx@secondoftwo
+ \fi
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+ \expandafter\ltx@gobble
+\else
+ \expandafter\ltx@firstofone
+\fi
+{%
+% \end{macrocode}
+% \begin{macro}{\ltx@ifundefined}
+% \begin{macrocode}
+ \def\ltx@ifundefined#1{%
+ \ifcsname #1\endcsname
+ \expandafter\ifx\csname #1\endcsname\relax
+ \expandafter\expandafter\expandafter\ltx@firstoftwo
+ \else
+ \expandafter\expandafter\expandafter\ltx@secondoftwo
+ \fi
+ \else
+ \expandafter\ltx@firstoftwo
+ \fi
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@IfUndefined}
+% \begin{macrocode}
+ \let\ltx@IfUndefined\ltx@ifundefined
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+}
+% \end{macrocode}
+%
+% \subsection{Stripping}
+%
+% \begin{macro}{\ltx@RemovePrefix}
+% \begin{macrocode}
+\def\ltx@RemovePrefix#1>{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@StripPrefix}
+% \begin{macrocode}
+\def\ltx@StripPrefix{%
+ \expandafter\ltx@RemovePrefix
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@onelevel@sanitize}
+% \begin{macrocode}
+\def\ltx@onelevel@sanitize#1{%
+ \edef#1{%
+ \expandafter
+ \ltx@RemovePrefix\meaning#1%
+ }%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{File management}
+%
+% \subsubsection{File extensions}
+%
+% \begin{macro}{\ltx@clsextension}
+% \begin{macrocode}
+\def\ltx@clsextension{cls}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@pkgextension}
+% \begin{macrocode}
+\def\ltx@pkgextension{sty}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Load check}
+%
+% \begin{macro}{\ltx@iffileloaded}
+% \begin{macrocode}
+\def\ltx@iffileloaded#1{%
+ \ltx@ifundefined{ver@#1}\ltx@secondoftwo\ltx@firstoftwo
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ifclassloaded}
+% \begin{macrocode}
+\def\ltx@ifclassloaded#1{%
+ \ltx@iffileloaded{#1.\ltx@clsextension}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ifpackageloaded}
+% \begin{macrocode}
+\def\ltx@ifpackageloaded#1{%
+ \ltx@iffileloaded{#1.\ltx@pkgextension}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Version date check}
+%
+% \begin{macro}{\ltx@iffilelater}
+% \begin{macrocode}
+\def\ltx@iffilelater#1#2{%
+ \ltx@iffileloaded{#1}{%
+ \expandafter\LTXcmds@IfLater\expandafter{%
+ \number
+ \expandafter\expandafter\expandafter\LTXcmds@ParseVersion
+ \expandafter\expandafter\expandafter{%
+ \csname ver@#1\endcsname
+ }%
+ \expandafter}\expandafter{%
+ \number
+ \expandafter\LTXcmds@ParseVersion\expandafter{#2}%
+ }%
+ }\ltx@secondoftwo
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@IfLater}
+% \begin{macrocode}
+\def\LTXcmds@IfLater#1#2{%
+ \ifcase 0%
+ \ifnum#1<19940101 %
+ \else
+ \ifnum#2<19940101 %
+ \else
+ \ifnum#2>#1 %
+ \else
+ 1%
+ \fi
+ \fi
+ \fi
+ \ltx@space
+ \expandafter\ltx@secondoftwo
+ \else
+ \expandafter\ltx@firstoftwo
+ \fi
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ifclasslater}
+% \begin{macrocode}
+\def\ltx@ifclasslater#1{%
+ \ltx@iffilelater{#1.\ltx@clsextension}%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ifpackagelater}
+% \begin{macrocode}
+\def\ltx@ifpackagelater#1{%
+ \ltx@iffilelater{#1.\ltx@pkgextension}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\ltx@IfUndefined{pdfmatch}{%
+% \end{macrocode}
+% \begin{macro}{\LTXcmds@ParseVersion}
+% \begin{macrocode}
+ \def\LTXcmds@ParseVersion#1{%
+ \LTXcmds@@ParseVersion#10000/00/00\@nil
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@@ParseVersion}
+% \begin{macrocode}
+ \def\LTXcmds@@ParseVersion#1#2#3#4/#5#6/#7#8#9\@nil{%
+ #1#2#3#4#5#6#7#8%
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+}{%
+% \end{macrocode}
+% \begin{macro}{\LTXcmds@ParseVersion}
+% \begin{macrocode}
+ \def\LTXcmds@ParseVersion#1{%
+ \ifnum\pdfmatch{%
+ ^%
+ (199[4-9]|[2-9][0-9][0-9][0-9])/%
+ (0[1-9]|1[0-2])/%
+ (0[1-9]|[1-2][0-9]|3[0-1])%
+ }{#1}=1 %
+ \ltx@StripPrefix\pdflastmatch1 %
+ \ltx@StripPrefix\pdflastmatch2 %
+ \ltx@StripPrefix\pdflastmatch3 %
+ \else
+ 0%
+ \fi
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+}
+% \end{macrocode}
+%
+% \subsection{Macro additions}
+%
+% \begin{macro}{\ltx@GlobalAppendToMacro}
+% \begin{macrocode}
+\long\def\ltx@GlobalAppendToMacro#1#2{%
+ \ifx\ltx@undefined#1%
+ \let#1\ltx@empty
+ \else
+ \ifx\relax#1%
+ \let#1\ltx@empty
+ \fi
+ \fi
+ \begingroup
+ \ltx@LocToksA\expandafter{#1#2}%
+ \xdef#1{\the\ltx@LocToksA}%
+ \endgroup
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocalAppendToMacro}
+% \begin{macrocode}
+\long\def\ltx@LocalAppendToMacro#1#2{%
+ \global\let\LTXcmds@gtemp#1%
+ \ifx\ltx@undefined\LTXcmds@gtemp
+ \global\let\LTXcmds@gtemp\ltx@empty
+ \else
+ \ifx\relax\LTXcmds@gtemp
+ \global\letLTXcmds@gtemp\ltx@empty
+ \fi
+ \fi
+ \begingroup
+ \ltx@LocToksA\expandafter{\LTXcmds@gtemp#2}%
+ \xdef\LTXcmds@gtemp{\the\ltx@LocToksA}%
+ \endgroup
+ \let#1\LTXcmds@gtemp
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@GlobalPrependToMacro}
+% \begin{macrocode}
+\long\def\ltx@GlobalPrependToMacro#1#2{%
+ \ifx\ltx@undefined#1%
+ \let#1\ltx@empty
+ \else
+ \ifx\relax#1%
+ \let#1\ltx@empty
+ \fi
+ \fi
+ \begingroup
+ \ltx@LocToksA{#2}%
+ \ltx@LocToksB\expandafter{#1}%
+ \xdef#1{\the\ltx@LocToksA\the\ltx@LocToksB}%
+ \endgroup
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@LocalPrependToMacro}
+% \begin{macrocode}
+\long\def\ltx@LocalPrependToMacro#1#2{%
+ \global\let\LTXcmds@gtemp#1%
+ \ifx\ltx@undefined\LTXcmds@gtemp
+ \global\let\LTXcmds@gtemp\ltx@empty
+ \else
+ \ifx\relax\LTXcmds@gtemp
+ \global\letLTXcmds@gtemp\ltx@empty
+ \fi
+ \fi
+ \begingroup
+ \ltx@LocToksA{#2}%
+ \ltx@LocToksB\expandafter{\LTXcmds@gtemp}%
+ \xdef\LTXcmds@gtemp{\the\ltx@LocToksA\the\ltx@LocToksB}%
+ \endgroup
+ \let#1\LTXcmds@gtemp
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Next character detection}
+%
+% \begin{macro}{\ltx@ifnextchar}
+% \begin{macrocode}
+\long\def\ltx@ifnextchar#1#2#3{%
+ \begingroup
+ \let\LTXcmds@CharToken= #1\relax
+ \ltx@LocToksA{\endgroup#2}%
+ \ltx@LocToksB{\endgroup#3}%
+ \futurelet\LTXcmds@LetToken\LTXcmds@ifnextchar
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@ifnextchar}
+% \begin{macrocode}
+\def\LTXcmds@ifnextchar{%
+ \ifx\LTXcmds@LetToken\LTXcmds@CharToken
+ \the\expandafter\ltx@LocToksA
+ \else
+ \expandafter
+ \ifx\csname LTXcmds@LetToken\endcsname\LTXcmds@SpaceToken
+ \expandafter\expandafter\expandafter\LTXcmds@@ifnextchar
+ \else
+ \the\expandafter\expandafter\expandafter\ltx@LocToksB
+ \fi
+ \fi
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@@ifnextchar}
+% \cs{futurelet} does not distinguish between a
+% character and a command that is a character
+% (defined by using \cs{let} or \cs{futurelet}).
+% Therefore the space is catched by \cs{romannumeral}
+% with negative character constant that gobbles one
+% optional space.
+% \begin{macrocode}
+\def\LTXcmds@@ifnextchar{%
+ \expandafter\futurelet
+ \expandafter\LTXcmds@LetToken
+ \expandafter\LTXcmds@ifnextchar
+ \romannumeral-`\.%
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@SpaceToken}
+% \begin{macrocode}
+\ltx@firstofone{\let\LTXcmds@SpaceToken= } %
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@ifnextchar@nospace}
+% \begin{macrocode}
+\long\def\ltx@ifnextchar@nospace#1#2#3{%
+ \begingroup
+ \let\LTXcmds@CharToken= #1\relax
+ \ltx@LocToksA{\endgroup#2}%
+ \ltx@LocToksB{\endgroup#3}%
+ \futurelet\LTXcmds@LetToken\LTXcmds@ifnextchar@nospace
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@ifnextchar@nospace}
+% \begin{macrocode}
+\def\LTXcmds@ifnextchar@nospace{%
+ \the
+ \ifx\LTXcmds@LetToken\LTXcmds@CharToken
+ \expandafter\ltx@LocToksA
+ \else
+ \expandafter\ltx@LocToksB
+ \fi
+}
+% \end{macrocode}
+% \end{macro}
+% \subsection{\cs{ltx@leavevmode}, \cs{ltx@mbox}}
+%
+% \begin{macro}{\ltx@leavevmode}
+% \begin{macrocode}
+\ltx@IfUndefined{quitvmode}{%
+ \ltx@IfUndefined{leavevmode}{%
+ \ltx@IfUndefined{voidb@x}{%
+ \ltx@IfUndefined{newbox}{%
+ \def\ltx@leavevmode{%
+ \begingroup
+ \setbox\ltx@zero=\hbox{}%
+ \begingroup
+ \setbox\ltx@zero=\hbox{\box\ltx@zero}%
+ \endgroup
+ \unhbox\ltx@zero
+ \endgroup
+ }%
+ }{%
+ \csname newbox\endcsname\LTXcmds@VoidBox
+ \ifvoid\LTXcmds@VoidBox
+ \else
+ \setbox\LTXcmds@VoidBox=\hbox{}%
+ \begingroup
+ \setbox\LTXcmds@VoidBox=\hbox{\box\LTXcmds@VoidBox}%
+ \endgroup
+ \fi
+ \def\ltx@leavevmode{\unhbox\LTXcmds@VoidBox}%
+ }%
+ }{%
+ \def\ltx@leavevmode{\unhbox\voidb@x}%
+ }%
+ }{%
+ \let\ltx@leavevmode\leavevmode
+ }%
+}{%
+ \let\ltx@leavevmode\quitvmode
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@mbox}
+% \begin{macrocode}
+\def\ltx@mbox{%
+ \ltx@leavevmode
+ \hbox
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Help macros}
+%
+% \begin{macro}{\LTXcmds@num}
+% \begin{macrocode}
+\ltx@IfUndefined{numexpr}{%
+ \def\LTXcmds@num#1{%
+ \expandafter\ltx@firstofone\expandafter{%
+ \number#1%
+ }%
+ }%
+}{%
+ \def\LTXcmds@num#1{%
+ \expandafter\ltx@firstofone\expandafter{%
+ \the\numexpr#1%
+ }%
+ }%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Expandable test for emptiness}
+%
+% \begin{macrocode}
+\ltx@IfUndefined{detokenize}{%
+% \end{macrocode}
+%
+% \subsubsection{Vanilla \hologo{TeX}}
+%
+% \begin{macro}{\ltx@ifempty}
+% The macro is based on \cs{@ifempty} of Robert R. Schneck
+% \cite{ifempty:schneck}
+% and \cs{@ifnull} of Ulrich Diez \cite{ifnull:diez}.
+% There are three cases to consider:
+% \begin{compactenum}
+% \item |#1| is empty,
+% \item |#1| is not empty and the first token
+% is not a begingroup character,
+% \item |#1| starts with a begingroup character (catcode 1).
+% \end{compactenum}
+% \begin{macrocode}
+ \def\LTXcmds@temp#1{%
+ \long\def\ltx@ifempty##1{%
+ \romannumeral0%
+ \iffalse{\fi
+ \expandafter\ltx@gobble\expandafter{%
+ \expandafter{\string##1}%
+ \expandafter\ltx@gobble\string
+ }%
+ \expandafter\ltx@firstofthree\expandafter
+ {\iffalse}\fi
+ \expandafter#1\ltx@secondoftwo
+ }%
+ \expandafter#1\ltx@firstoftwo
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx@ifblank}
+% \begin{macrocode}
+ \long\def\ltx@ifblank##1{%
+ \romannumeral0%
+ \iffalse{\fi
+ \expandafter\expandafter\expandafter\ltx@gobble
+ \expandafter\expandafter\expandafter{%
+ \expandafter\expandafter\expandafter{%
+ \expandafter\string\ltx@gobble##1.%
+ }%
+ \expandafter\ltx@gobble\string
+ }%
+ \expandafter\ltx@firstofthree\expandafter
+ {\iffalse}\fi
+ \expandafter#1\ltx@secondoftwo
+ }%
+ \expandafter#1\ltx@firstoftwo
+ }%
+ }%
+ \LTXcmds@temp{ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macrocode}
+}{%
+% \end{macrocode}
+%
+% \subsubsection{With \cs{detokenize}}
+%
+% Ahmed Musa provided \cs{ifstrempty} using \cs{detokenize}
+% and \cs{pdfstrcmp} \cite{ifstrempty:musa}. Ulrich Diez, GL,
+% Heiko Oberdiek
+% improved it further by removing \cs{pdfstrcmp} and
+% taking three arguments
+% \cite{ifstrempty:diez1,ifstrempty:diez2,ifstrempty:diez3,^^A
+% ifstrempty:gl,ifstrempty:ho}.
+%
+% \begin{macro}{\ltx@ifempty}
+% \begin{macrocode}
+ \long\def\ltx@ifempty#1{%
+ \romannumeral%
+ \csname
+ LTXcmds@ifempty%
+ \ifcat$\detokenize{#1}$%
+ @%
+ \fi
+ \endcsname
+ }%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@ifempty@}
+% \begin{macrocode}
+ \long\def\LTXcmds@ifempty@#1#2{0 #1}%
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@ifempty}
+% \begin{macrocode}
+ \long\def\LTXcmds@ifempty#1#2{0 #2}%
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{\cs{ltx@ifblank}}
+%
+% \begin{macro}{\ltx@ifblank}
+% \begin{macrocode}
+ \long\def\ltx@ifblank#1{%
+ \romannumeral%
+ \csname
+ LTXcmds@ifempty%
+ \ifcat$\detokenize\expandafter{\ltx@gobble#1.}$%
+ @%
+ \fi
+ \endcsname
+ }%
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+}
+% \end{macrocode}
+%
+% \subsection{\cs{ltx@zapspace}}
+%
+% \begin{macro}{\ltx@zapspace}
+% \begin{macrocode}
+\long\def\ltx@zapspace#1{%
+ \romannumeral
+ \LTXcmds@zapspace\ltx@zero#1 \@nil
+}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\LTXcmds@zapspace}
+% \begin{macrocode}
+\long\def\LTXcmds@zapspace#1 #2\@nil{%
+ \ltx@ifempty{#2}{%
+ #1%
+ }{%
+ \LTXcmds@zapspace#1#2\@nil
+ }%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{\cs{ltx@IfBoxEmpty}}
+%
+% In case of \hologo{eTeX} the test for an empty box
+% is done via \cs{lastnodetype} as suggested
+% by David Kastrup \cite{ifboxempty:dak}.
+% \begin{macrocode}
+\ltx@IfUndefined{lastnodetype}{%
+ \catcode`\$=9 %
+ \catcode`\&=14 %
+}{%
+ \catcode`\$=14 %
+ \catcode`\&=9 %
+}
+% \end{macrocode}
+% \begin{macro}{\ltx@IfBoxEmpty}
+% \begin{macrocode}
+\def\ltx@IfBoxEmpty#1{%
+ \ifvoid#1\relax
+ \expandafter\ltx@secondoftwo
+ \else
+% \end{macrocode}
+% Implementation using \hologo{eTeX}'s \cs{lastnodetype}.
+% \begin{macrocode}
+& \begingroup
+& \setbox\ltx@zero=\ifhbox#1\hbox\else\vbox\fi{%
+& \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+& \expandafter
+& }%
+& \expandafter\endgroup
+& \ifnum\lastnodetype<\ltx@zero
+& \expandafter\expandafter\expandafter\ltx@firstoftwo
+& \else
+& \expandafter\expandafter\expandafter\ltx@secondoftwo
+& \fi
+% \end{macrocode}
+% Implementation without \hologo{eTeX} using a signature
+% at the beginning of the test box.
+% \begin{macrocode}
+$ \begingroup
+$ \setbox\ltx@zero=\ifhbox#1\hbox\else\vbox\fi{%
+$ \penalty\ltx@one
+$ \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$ \expandafter
+$ }%
+$ \ifnum\lastpenalty=\ltx@one
+% \end{macrocode}
+% Box 0 has been changed and is restored by
+% closing the group.
+% \begin{macrocode}
+$ \endgroup
+$ \begingroup
+$ \setbox\ltx@zero=\ifhbox#1\hbox\else\vbox\fi{%
+$ \penalty\ltx@two
+$ \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$ \expandafter
+$ }%
+$ \ifnum\lastpenalty=\ltx@two
+$ \def\next{\endgroup\expandafter\ltx@firstoftwo}%
+$ \else
+$ \def\next{\endgroup\expandafter\ltx@secondoftwo}%
+$ \fi
+$ \else
+$ \def\next{\endgroup\expandafter\ltx@secondoftwo}%
+$ \fi
+$ \next
+ \fi
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ltx@IfBoxVoidOrEmpty}
+% \begin{macrocode}
+\def\ltx@IfBoxVoidOrEmpty#1{%
+ \ifvoid#1\relax
+ \expandafter\ltx@thirdoffour
+ \fi
+ \ltx@IfBoxEmpty{#1}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+\LTXcmds@AtEnd%
+%</package>
+% \end{macrocode}
+%% \section{Installation}
+%
+% \subsection{Download}
+%
+% \paragraph{Package.} This package is available on
+% CTAN\footnote{\CTANpkg{ltxcmds}}:
+% \begin{description}
+% \item[\CTAN{macros/latex/contrib/ltxcmds/ltxcmds.dtx}] The source file.
+% \item[\CTAN{macros/latex/contrib/ltxcmds/ltxcmds.pdf}] Documentation.
+% \end{description}
+%
+%
+% \paragraph{Bundle.} All the packages of the bundle `ltxcmds'
+% are also available in a TDS compliant ZIP archive. There
+% the packages are already unpacked and the documentation files
+% are generated. The files and directories obey the TDS standard.
+% \begin{description}
+% \item[\CTANinstall{install/macros/latex/contrib/ltxcmds.tds.zip}]
+% \end{description}
+% \emph{TDS} refers to the standard ``A Directory Structure
+% for \TeX\ Files'' (\CTANpkg{tds}). Directories
+% with \xfile{texmf} in their name are usually organized this way.
+%
+% \subsection{Bundle installation}
+%
+% \paragraph{Unpacking.} Unpack the \xfile{ltxcmds.tds.zip} in the
+% TDS tree (also known as \xfile{texmf} tree) of your choice.
+% Example (linux):
+% \begin{quote}
+% |unzip ltxcmds.tds.zip -d ~/texmf|
+% \end{quote}
+%
+% \subsection{Package installation}
+%
+% \paragraph{Unpacking.} The \xfile{.dtx} file is a self-extracting
+% \docstrip\ archive. The files are extracted by running the
+% \xfile{.dtx} through \plainTeX:
+% \begin{quote}
+% \verb|tex ltxcmds.dtx|
+% \end{quote}
+%
+% \paragraph{TDS.} Now the different files must be moved into
+% the different directories in your installation TDS tree
+% (also known as \xfile{texmf} tree):
+% \begin{quote}
+% \def\t{^^A
+% \begin{tabular}{@{}>{\ttfamily}l@{ $\rightarrow$ }>{\ttfamily}l@{}}
+% ltxcmds.sty & tex/generic/ltxcmds/ltxcmds.sty\\
+% ltxcmds.pdf & doc/latex/ltxcmds/ltxcmds.pdf\\
+% ltxcmds.dtx & source/latex/ltxcmds/ltxcmds.dtx\\
+% \end{tabular}^^A
+% }^^A
+% \sbox0{\t}^^A
+% \ifdim\wd0>\linewidth
+% \begingroup
+% \advance\linewidth by\leftmargin
+% \advance\linewidth by\rightmargin
+% \edef\x{\endgroup
+% \def\noexpand\lw{\the\linewidth}^^A
+% }\x
+% \def\lwbox{^^A
+% \leavevmode
+% \hbox to \linewidth{^^A
+% \kern-\leftmargin\relax
+% \hss
+% \usebox0
+% \hss
+% \kern-\rightmargin\relax
+% }^^A
+% }^^A
+% \ifdim\wd0>\lw
+% \sbox0{\small\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\footnotesize\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\scriptsize\t}^^A
+% \ifdim\wd0>\linewidth
+% \ifdim\wd0>\lw
+% \sbox0{\tiny\t}^^A
+% \ifdim\wd0>\linewidth
+% \lwbox
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \else
+% \lwbox
+% \fi
+% \else
+% \usebox0
+% \fi
+% \end{quote}
+% If you have a \xfile{docstrip.cfg} that configures and enables \docstrip's
+% TDS installing feature, then some files can already be in the right
+% place, see the documentation of \docstrip.
+%
+% \subsection{Refresh file name databases}
+%
+% If your \TeX~distribution
+% (\TeX\,Live, \mikTeX, \dots) relies on file name databases, you must refresh
+% these. For example, \TeX\,Live\ users run \verb|texhash| or
+% \verb|mktexlsr|.
+%
+% \subsection{Some details for the interested}
+%
+% \paragraph{Unpacking with \LaTeX.}
+% The \xfile{.dtx} chooses its action depending on the format:
+% \begin{description}
+% \item[\plainTeX:] Run \docstrip\ and extract the files.
+% \item[\LaTeX:] Generate the documentation.
+% \end{description}
+% If you insist on using \LaTeX\ for \docstrip\ (really,
+% \docstrip\ does not need \LaTeX), then inform the autodetect routine
+% about your intention:
+% \begin{quote}
+% \verb|latex \let\install=y\input{ltxcmds.dtx}|
+% \end{quote}
+% Do not forget to quote the argument according to the demands
+% of your shell.
+%
+% \paragraph{Generating the documentation.}
+% You can use both the \xfile{.dtx} or the \xfile{.drv} to generate
+% the documentation. The process can be configured by the
+% configuration file \xfile{ltxdoc.cfg}. For instance, put this
+% line into this file, if you want to have A4 as paper format:
+% \begin{quote}
+% \verb|\PassOptionsToClass{a4paper}{article}|
+% \end{quote}
+% An example follows how to generate the
+% documentation with pdf\LaTeX:
+% \begin{quote}
+%\begin{verbatim}
+%pdflatex ltxcmds.dtx
+%makeindex -s gind.ist ltxcmds.idx
+%pdflatex ltxcmds.dtx
+%makeindex -s gind.ist ltxcmds.idx
+%pdflatex ltxcmds.dtx
+%\end{verbatim}
+% \end{quote}
+%
+% \begin{thebibliography}{9}
+% \raggedright
+%
+% \bibitem{ifempty:schneck}
+% Robert R. Schneck:
+% \textit{Re: \cs{ifempty} solution %
+% (was Macro puzzle: maximally general \cs{ifempty})};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:3eef1ada_6@corp.newsgroups.com},
+% 2003-06-17.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/be03a159ec374895}}
+%
+% \bibitem{ifnull:diez}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:ibk3t8$ee7$1@news.albasani.net},
+% 2010-11-12.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/803bd57221a04996}}
+%
+% \bibitem{ifstrempty:musa}
+% Ahmed Musa:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:f5496afe-40ed-42bd-b629-a2419ecf7c0d@o14g2000prn.googlegroups.com},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/fbf7d61a0c3a807d}}
+%
+% \bibitem{ifstrempty:diez1}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idbo94$uka$1@four.albasani.net},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/0c230ee479487962}}
+%
+% \bibitem{ifstrempty:diez2}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idbpu4$cg1$1@news.albasani.net},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/bbef4263390d647b}}
+%
+% \bibitem{ifstrempty:diez3}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idd4ga$r83$1@four.albasani.net},
+% 2010-12-04.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/00dfd1ec103cd272}}
+%
+% \bibitem{ifstrempty:gl}
+% GL:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:4cfa2e27$0$7389$426a74cc@news.free.fr},
+% 2010-12-04.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/d3a75995c1cf267e}}
+%
+% \bibitem{ifstrempty:ho}
+% Heiko Oberdiek:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:iddhq1$3kj$1@news.eternal-september.org},
+% 2010-12-04.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/5f7a23e3ab70e347}}
+%
+% \bibitem{ifboxempty:dak}
+% David Kastrup:
+% \textit{How to detect if \cs{vbox} is empty};
+% newsgroup \xnewsgroup{comp.text.tex},
+% 2011-02-04.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/8d3cb89496a4d86d}}
+%
+% \end{thebibliography}
+%
+% \begin{History}
+% \begin{Version}{2009/08/05 v1.0}
+% \item
+% First version.
+% \end{Version}
+% \begin{Version}{2009/12/12 v1.1}
+% \item
+% Short title shortened.
+% \item
+% \cs{ltx@IfUndefined} added.
+% \end{Version}
+% \begin{Version}{2010/01/28 v1.2}
+% \item
+% \cs{ltx@RemovePrefix} and \cs{ltx@StripPrefix} added.
+% \item
+% \cs{ltx@ifclassloaded}, \cs{ltx@ifpackageloaded},
+% \cs{ltx@iffileloaded},
+% \cs{ltx@ifclasslater}, \cs{ltx@ifpackagelater},
+% \cs{ltx@iffilelater},
+% \cs{ltx@clsextension}, \cs{ltx@pkgextension} added.
+% \item
+% \cs{ltx@GlobalAppendToMacro}, \cs{ltx@LocalAppendToMacro} added.
+% \end{Version}
+% \begin{Version}{2010/03/01 v1.3}
+% \item
+% \cs{ltx@newif} added.
+% \item
+% \cs{ltx@ifnextchar} added.
+% \item
+% Numbers \cs{ltx@zero}, \cs{ltx@one}, \cs{ltx@two}, \cs{ltx@cclv} added.
+% \end{Version}
+% \begin{Version}{2010/03/09 v1.4}
+% \item
+% \cs{ltx@pkgextension} and \cs{ltx@clsextension} are hardcoded to
+% avoid trouble with \cs{@onlypreamble}.
+% \end{Version}
+% \begin{Version}{2010/04/08 v1.5}
+% \item
+% \cs{ltx@cartwo}, \cs{ltx@cdrtwo},
+% \cs{ltx@carthree}, \cs{ltx@cdrthree},
+% \cs{ltx@carfour}, \cs{ltx@cdrfour} added.
+% \item
+% \cs{ltx@ReturnAfterFi} and \cs{ltx@ReturnAfterElseFi} fixed.
+% \end{Version}
+% \begin{Version}{2010/04/16 v1.6}
+% \item
+% \cs{ltx@leavevmode}, \cs{ltx@mbox} added.
+% \end{Version}
+% \begin{Version}{2010/04/26 v1.7}
+% \item
+% \cs{ltx@GobbleNum}, \cs{ltx@CdrNum}, \cs{ltx@CarNum} added.
+% \item
+% \cs{ltx@carzero}, \cs{ltx@cdrzero} added.
+% \item
+% \cs{ltx@hashchar} added.
+% \end{Version}
+% \begin{Version}{2010/09/11 v1.8}
+% \item
+% \cs{ltx@leftbracechar}, \cs{ltx@rightbracechar} added.
+% \end{Version}
+% \begin{Version}{2010/10/25 v1.9}
+% \item
+% \cs{ltx@LocalAppendToMacro} and \cs{ltx@GlobalAppendToMacro} are
+% now \cs{long}.
+% \end{Version}
+% \begin{Version}{2010/10/31 v1.10}
+% \item
+% \cs{ltx@newglobalif} added.
+% \end{Version}
+% \begin{Version}{2010/11/12 v1.11}
+% \item
+% \cs{ltx@ifempty} added.
+% \item
+% \cs{ltx@firstofthree}, \cs{ltx@secondofthree}, \cs{ltx@thirdofthree}
+% added.
+% \end{Version}
+% \begin{Version}{2010/12/02 v1.12}
+% \item
+% \cs{ltx@onelevel@sanitize} added.
+% \item
+% \cs{LTXcmds@num} fixed for the case with \cs{numexpr}
+% (bug found by GL).
+% \end{Version}
+% \begin{Version}{2010/12/04 v1.13}
+% \item
+% \cs{ltx@ifblank} added.
+% \item
+% Optimization for \cs{ltx@ifempty}.
+% \end{Version}
+% \begin{Version}{2010/12/07 v1.14}
+% \item
+% \cs{ltx@zapspace} added.
+% \end{Version}
+% \begin{Version}{2010/12/12 v1.15}
+% \item
+% \cs{ltx@minusone} added.
+% \end{Version}
+% \begin{Version}{2011/02/04 v1.16}
+% \item
+% \cs{ltx@IfBoxEmpty} and \cs{ltx@IfBoxVoidOrEmpty} added.
+% \item
+% \cs{ltx@firstoffour}, \dots, \cs{ltx@fourthoffour} added.
+% \end{Version}
+% \begin{Version}{2011/02/05 v1.17}
+% \item
+% \cs{ltx@IfBoxEmpty}: an empty box may have non-zero dimensions.
+% \end{Version}
+% \begin{Version}{2011/03/16 v1.18}
+% \item
+% \cs{ltx@ifclasslater} fixed.
+% \end{Version}
+% \begin{Version}{2011/04/14 v1.19}
+% \item
+% \cs{ltx@ifnextchar}: detection of optional spaces modified.
+% \item
+% \cs{ltx(Loc,Glob)(Toks,Dimen,Skip)(A,B,C,D,E)} added.
+% \end{Version}
+% \begin{Version}{2011/04/18 v1.20}
+% \item
+% \cs{ltx@ifnextchar} with conditional support (thanks GL for
+% bug report).
+% \end{Version}
+% \begin{Version}{2011/08/22 v1.21}
+% \item
+% \cs{ltx@GlobalPrependToMacro}, \cs{ltx@LocalPrependToMacro} added
+% (feature request of Martin M\"unch).
+% \end{Version}
+% \begin{Version}{2011/11/09 v1.22}
+% \item
+% \cs{ltx@carsecond}, \cs{ltx@carthird}, \cs{ltx@carfourth},
+% \cs{ltx@CarNumth} added.
+% \item
+% \cs{ltx@cdrzero}, \cs{ltx@cdr}, \cs{ltx@cdrtwo}, cs{ltx@cdrthree},
+% \cs{ltx@cdrfour}, \cs{ltx@CdrNum} modified to retain braces and spaces.
+% They are expandable in two expansion steps.
+% \end{Version}
+% \begin{Version}{2016/05/16 v1.23}
+% \item
+% Documentation updates.
+% \end{Version}
+% \begin{Version}{2019/12/15 v1.24}
+% \item
+% Documentation updates.
+% \end{Version}
+% \end{History}
+%
+% \PrintIndex
+%
+% \Finale
+\endinput
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