texlive[53165] Master: ltxcmds split from oberdiek (18dec19)

commits+karl at tug.org commits+karl at tug.org
Wed Dec 18 00:21:23 CET 2019


Revision: 53165
          http://tug.org/svn/texlive?view=revision&revision=53165
Author:   karl
Date:     2019-12-18 00:21:23 +0100 (Wed, 18 Dec 2019)
Log Message:
-----------
ltxcmds split from oberdiek (18dec19)

Modified Paths:
--------------
    trunk/Master/tlpkg/bin/tlpkg-ctan-check
    trunk/Master/tlpkg/tlpsrc/collection-latex.tlpsrc

Added Paths:
-----------
    trunk/Master/texmf-dist/doc/latex/ltxcmds/
    trunk/Master/texmf-dist/doc/latex/ltxcmds/README.md
    trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf
    trunk/Master/texmf-dist/source/latex/ltxcmds/
    trunk/Master/texmf-dist/source/latex/ltxcmds/ltxcmds.dtx
    trunk/Master/texmf-dist/tex/generic/ltxcmds/
    trunk/Master/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty
    trunk/Master/tlpkg/tlpsrc/ltxcmds.tlpsrc

Added: trunk/Master/texmf-dist/doc/latex/ltxcmds/README.md
===================================================================
--- trunk/Master/texmf-dist/doc/latex/ltxcmds/README.md	                        (rev 0)
+++ trunk/Master/texmf-dist/doc/latex/ltxcmds/README.md	2019-12-17 23:21:23 UTC (rev 53165)
@@ -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.
+


Property changes on: trunk/Master/texmf-dist/doc/latex/ltxcmds/README.md
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Added: svn:eol-style
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+native
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Added: trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf
===================================================================
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Index: trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf
===================================================================
--- trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf	2019-12-17 23:20:09 UTC (rev 53164)
+++ trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf	2019-12-17 23:21:23 UTC (rev 53165)

Property changes on: trunk/Master/texmf-dist/doc/latex/ltxcmds/ltxcmds.pdf
___________________________________________________________________
Added: svn:mime-type
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+application/pdf
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Added: trunk/Master/texmf-dist/source/latex/ltxcmds/ltxcmds.dtx
===================================================================
--- trunk/Master/texmf-dist/source/latex/ltxcmds/ltxcmds.dtx	                        (rev 0)
+++ trunk/Master/texmf-dist/source/latex/ltxcmds/ltxcmds.dtx	2019-12-17 23:21:23 UTC (rev 53165)
@@ -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 at zero} \TO 0\\
+%   \cs{ltx at one} \TO 1\\
+%   \cs{ltx at two} \TO 2\\
+%   \cs{ltx at cclv} \TO 255\\
+%   \cs{ltx at 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 at 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 at LocToksA}.
+%
+% Since 2011/04/14 v1.19.
+%
+% \subsection{Argument killers}
+%
+% \begin{declcs}{ltx at gobble} \M{1} \TO\\
+%   \cs{ltx at gobbletwo} \M{1} \M{2} \TO\\
+%   \cs{ltx at gobblethree} \M{1} \M{2} \M{3} \TO\\
+%   \cs{ltx at gobblefour} \M{1} \M{2} \M{3} \M{4} \TO
+% \end{declcs}
+%
+% \begin{declcs}{ltx at GobbleNum} \M{num} \M{1} \M{2} \dots\space
+%   \M{\meta{num}} \TO
+% \end{declcs}
+% The first argument \meta{num} of macro \cs{ltx at GobbleNum} specifies,
+% how many following arguments are eaten. Macro \cs{ltx at GobbleNum}
+% is expandable in exact two expansion steps.
+%
+% \subsection{Argument grabbers}
+%
+% \begin{declcs}{ltx at firstofone} \M{1} \TO \meta{1}\\[1ex]
+%  \cs{ltx at firstoftwo} \M{1} \M{2} \TO \meta{1}\\
+%  \cs{ltx at secondoftwo} \M{1} \M{2} \TO \meta{2}\\[1ex]
+%  \cs{ltx at firstofthree} \M{1} \M{2} \M{3} \TO \meta{1}\\
+%  \cs{ltx at secondofthree} \M{1} \M{2} \M{3} \TO \meta{2}\\
+%  \cs{ltx at thirdofthree} \M{1} \M{2} \M{3} \TO \meta{3}\\
+%  \cs{ltx at firstoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{1}\\
+%  \cs{ltx at secondoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{2}\\
+%  \cs{ltx at thirdoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{3}\\
+%  \cs{ltx at fourthoffour} \M{1} \M{2} \M{3} \M{4} \TO \meta{4}
+% \end{declcs}
+% Macros \cs{ltx at firstofthree}, \cs{ltx at secondofthree}
+% and \cs{ltx at thirdofthree} were added in version
+% 2010/11/12 v1.11.
+% Macros \cs{ltx at firstoffour}, \dots, \cs{ltx at fourthoffour}
+% were added in version 2011/02/04 v1.16.
+%
+% \subsection{List helpers}
+%
+% \begin{declcs}{ltx at carzero} \dots\ \cs{@nil} \TO\\
+%   \cs{ltx at cdrzero} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx at car} \M{1} \dots\ \cs{@nil} \TO \meta{1}\\
+%   \cs{ltx at cdr} \M{1} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx at cartwo} \M{1} \M{2} \dots\ \cs{@nil}
+%   \TO \meta{1}\meta{2}\\
+%   \cs{ltx at carsecond} \M{1} \M{2} \dots\ \cs{@nil} \TO \meta{2}\\
+%   \cs{ltx at cdrtwo} \M{1} \M{2} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx at carthree} \M{1} \M{2} \M{3} \dots\ \cs{@nil}
+%       \TO \meta{1}\meta{2}\meta{3}\\
+%   \cs{ltx at carthird} \M{1} \M{2} \M{3} \dots\ \cs{@nil}
+%       \TO \meta{3}\\
+%   \cs{ltx at cdrthree} \M{1} \M{2} \M{3} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx at carfour} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil}
+%       \TO \meta{1}\meta{2}\meta{3}\meta{4}\\
+%   \cs{ltx at carfourth} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil}
+%       \TO \meta{4}\\
+%   \cs{ltx at cdrfour} \M{1} \M{2} \M{3} \M{4} \dots\ \cs{@nil} \TO \dots
+% \end{declcs}
+%
+% \begin{declcs}{ltx at 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 at CarNumth} \M{num} \M{1} \dots\ \M{\meta{num}}
+%   \M{\meta{num}+1} \dots\ \cs{@nil}\\
+%   \TO \M{\meta{num}} \dots\\
+%   \cs{ltx at 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 at carsecond}, \cs{ltx at carthird}, \cs{ltx at carfourth},
+%   \cs{ltx at CarNumth} added.
+% \item
+%   Macros \cs{ltx at cdr}, \cs{ltx at cdrtwo}, \cs{ltx at cdrthree}, \cs{ltx at cdrfour},
+%   \cs{ltx at 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 at ReturnAfterFi} \M{1} \cs{fi} \TO \cs{fi} \meta{1}\\
+%   \cs{ltx at ReturnAfterElseFi} \M{1} \cs{else} \M{2} \cs{fi}
+%     \TO \cs{fi} \meta{1}
+% \end{declcs}
+%
+% \subsection{Empty macro}
+%
+% \begin{declcs}{ltx at empty} \TO
+% \end{declcs}
+%
+% \subsection{Characters}
+%
+% \begin{declcs}{ltx at space} \TO \verb*| |\\
+%   \cs{ltx at percentchar} \TO \texttt{\%}\\
+%   \cs{ltx at backslashchar} \TO
+%      \makeatletter\texttt{\@backslashchar}\\
+%   \cs{ltx at hashchar} \TO \texttt{\#}\qquad(since v1.7)\\
+%   \cs{ltx at leftbracechar} \TO \texttt{\textbraceleft}\qquad(since v1.8)\\
+%   \cs{ltx at rightbracechar} \TO \texttt{\textbraceright}\qquad(since v1.8)
+% \end{declcs}
+%
+% \subsection{Boolean switch}
+%
+% \begin{declcs}{ltx at newif} \M{cmd}
+% \end{declcs}
+% \cs{ltx at newif} defines a new boolean switch \meta{cmd} like \cs{newif}.
+% Unlike \plainTeX's \cs{newif}, \cs{ltx at newif} is not \cs{outer}.
+% The command \meta{cmd} must start with the two characters |if|.
+%
+% \begin{declcs}{ltx at newglobalif} \M{cmd}
+% \end{declcs}
+% \cs{ltx at newglobalif} defines a new boolean switch \meta{cmd}
+% like \cs{ltx at 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 at 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 at 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 at 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 at RemovePrefix}\\
+%   \cs{ltx at 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 at RemovePrefix}
+% has the same meaning as \LaTeX's \cs{strip at prefix}, whereas
+% macro \cs{ltx at StripPrefix} expands the next token
+% once before stripping the prefix.
+%
+% \begin{declcs}{ltx at onelevel@sanitize} \M{macro}
+% \end{declcs}
+% Macro \cs{ltx at onelevel@sanitize} provides \hologo{LaTeX}'s
+% \cs{@onelevel at 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 at clsextension}\\
+%   \cs{ltx at pkgextension}
+% \end{declcs}
+% Macros \cs{ltx at clsextension} and \cs{ltx at 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 at ifclassloaded} \M{class} \M{yes} \M{no}\\
+%   \cs{ltx at ifpackageloaded} \M{package} \M{yes} \M{no}
+% \end{declcs}
+% Macros \cs{ltx at ifclassloaded}\slash\cs{ltx at 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 at 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 at 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 at iffileloaded}.
+%
+% Note that the file name used in \cs{ProvidesFile} and
+% \cs{ltx at 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 at ifclasslater} \M{class} \M{date} \M{yes} \M{no}\\
+%   \cs{ltx at ifpackagelater} \M{package} \M{date} \M{yes} \M{no}\\
+%   \cs{ltx at 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 at GlobalAppendToMacro} \M{cmd} \M{addition}\\
+%   \cs{ltx at 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 at GlobalPrependToMacro} \M{cmd} \M{addition}\\
+%   \cs{ltx at 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 at 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 at 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 at ifnextchar} breaks with an \hologo{TeX} error.
+%   \cs{ltx at ifnextchar} silently removes this token as
+%   optional space.
+% \end{itemize}
+% Since 2010/03/01 v1.3.
+%
+% \begin{declcs}{ltx at ifnextchar@nospace} \M{char} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx at ifnextchar@nospace} behaves like
+% macro \cs{ltx at ifnextchar} with the exception that
+% optional spaces are not supported before \meta{char}.
+% Since 2011/04/14 v1.19.
+%
+% \subsection{\cs{ltx at leavevmode}, \cs{ltx at mbox}}
+%
+% \begin{declcs}{ltx at leavevmode}
+% \end{declcs}
+% Macro \cs{ltx at leavevmode} calls \hologo{pdfTeX}'s \cs{quitvmode}.
+% Otherwise \cs{leavevmode} is used and defined if it is necessary.
+%
+% \begin{declcs}{ltx at mbox}
+% \end{declcs}
+% Macro \cs{ltx at mbox} reimplements \cs{mbox} with two changes.
+% Instead of \cs{leavevmode} it uses \cs{ltx at 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 at ifempty} \M{stuff} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx at 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 at ifblank} \M{stuff} \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx at 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 at zapspace} \M{stuff}
+% \end{declcs}
+% Macro \cs{ltx at zapspace} strips spaces from \meta{stuff}
+% that are not hidden inside curly braces. Like \hologo{LaTeX}'s
+% \cs{zap at space} it is expandable. Differences:
+% \begin{itemize}
+% \item
+% Syntax: \cs{zap at space} also expects a space token
+% and \cs{@empty} after \meta{stuff}.
+% \item
+% Macro \cs{ltx at zapspace} is expandable in exact two
+% expansion steps.
+% \item
+% Macro \cs{ltx at zapspace} always retains curly braces.
+% \item
+% Macro \cs{zap at 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 at zapspace} also works with \cs{par}
+% and conditionals (\cs{if}, \cs{else}, \cs{fi}, \dots).
+% \end{itemize}
+% Macro \cs{ltx at zapspace} is available since version
+% 2010/12/07 v1.14.
+%
+% \subsection{Check for emptiness of boxes}
+%
+% \begin{declcs}{ltx at IfBoxEmpty} \M{box register number}
+%   \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx at 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 at IfBoxEmpty} is available since 2010/02/04 v1.16.
+%
+% \begin{declcs}{ltx at IfBoxVoidOrEmpty} \M{box register number}
+%   \M{yes} \M{no}
+% \end{declcs}
+% Macro \cs{ltx at IfBoxVoidOrEmpty} calls \meta{yes} if
+% the box is either void or does not contain any content.
+% Otherwise \meta{no} is executed.
+% Macro \cs{ltx at 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 at 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 at 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 at 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 at EnsureCode#1#2{%
+  \edef\LTXcmds at AtEnd{%
+    \LTXcmds at AtEnd
+    \catcode#1=\the\catcode#1\relax
+  }%
+  \catcode#1=#2\relax
+}
+\TMP at EnsureCode{36}{3}% $
+\TMP at EnsureCode{38}{4}% &
+\TMP at EnsureCode{40}{12}% (
+\TMP at EnsureCode{41}{12}% )
+\TMP at EnsureCode{45}{12}% -
+\TMP at EnsureCode{46}{12}% .
+\TMP at EnsureCode{47}{12}% /
+\TMP at EnsureCode{60}{12}% <
+\TMP at EnsureCode{62}{12}% >
+\TMP at EnsureCode{91}{12}% [
+\TMP at EnsureCode{96}{12}% `
+\TMP at EnsureCode{93}{12}% ]
+\TMP at EnsureCode{94}{12}% ^ (superscript) (!)
+\TMP at EnsureCode{124}{12}% |
+\edef\LTXcmds at AtEnd{\LTXcmds at AtEnd\noexpand\endinput}
+%    \end{macrocode}
+%
+% \subsection{Numbers}
+%
+%    \begin{macro}{\ltx at zero}
+%    \begin{macrocode}
+\chardef\ltx at zero=0 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at one}
+%    \begin{macrocode}
+\chardef\ltx at one=1 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at two}
+%    \begin{macrocode}
+\chardef\ltx at two=2 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at active}
+%    \begin{macrocode}
+\chardef\ltx at active=13 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cclv}
+%    \begin{macrocode}
+\chardef\ltx at cclv=255 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at minusone}
+%    \begin{macrocode}
+\def\ltx at minusone{%
+  -\ltx at one
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Scratch registers}
+%
+%    \begin{macro}{\ltx at LocToksA}
+%    \begin{macrocode}
+\toksdef\ltx at LocToksA=0 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocToksB}
+%    \begin{macrocode}
+\toksdef\ltx at LocToksB=2 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocToksC}
+%    \begin{macrocode}
+\toksdef\ltx at LocToksC=4 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocToksD}
+%    \begin{macrocode}
+\toksdef\ltx at LocToksD=6 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocToksE}
+%    \begin{macrocode}
+\toksdef\ltx at LocToksE=8 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at GlobToksA}
+%    \begin{macrocode}
+\toksdef\ltx at GlobToksA=1 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobToksB}
+%    \begin{macrocode}
+\toksdef\ltx at GlobToksB=3 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobToksC}
+%    \begin{macrocode}
+\toksdef\ltx at GlobToksC=5 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobToksD}
+%    \begin{macrocode}
+\toksdef\ltx at GlobToksD=7 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobToksE}
+%    \begin{macrocode}
+\toksdef\ltx at GlobToksE=9 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at LocDimenA}
+%    \begin{macrocode}
+\dimendef\ltx at LocDimenA=0 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocDimenB}
+%    \begin{macrocode}
+\dimendef\ltx at LocDimenB=2 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocDimenC}
+%    \begin{macrocode}
+\dimendef\ltx at LocDimenC=4 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocDimenD}
+%    \begin{macrocode}
+\dimendef\ltx at LocDimenD=6 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocDimenE}
+%    \begin{macrocode}
+\dimendef\ltx at LocDimenE=8 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at GlobDimenA}
+%    \begin{macrocode}
+\dimendef\ltx at GlobDimenA=1 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobDimenB}
+%    \begin{macrocode}
+\dimendef\ltx at GlobDimenB=3 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobDimenC}
+%    \begin{macrocode}
+\dimendef\ltx at GlobDimenC=5 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobDimenD}
+%    \begin{macrocode}
+\dimendef\ltx at GlobDimenD=7 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobDimenE}
+%    \begin{macrocode}
+\dimendef\ltx at GlobDimenE=9 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at LocSkipA}
+%    \begin{macrocode}
+\skipdef\ltx at LocSkipA=0 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocSkipB}
+%    \begin{macrocode}
+\skipdef\ltx at LocSkipB=2 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocSkipC}
+%    \begin{macrocode}
+\skipdef\ltx at LocSkipC=4 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocSkipD}
+%    \begin{macrocode}
+\skipdef\ltx at LocSkipD=6 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocSkipE}
+%    \begin{macrocode}
+\skipdef\ltx at LocSkipE=8 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at GlobSkipA}
+%    \begin{macrocode}
+\skipdef\ltx at GlobSkipA=1 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobSkipB}
+%    \begin{macrocode}
+\skipdef\ltx at GlobSkipB=3 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobSkipC}
+%    \begin{macrocode}
+\skipdef\ltx at GlobSkipC=5 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobSkipD}
+%    \begin{macrocode}
+\skipdef\ltx at GlobSkipD=7 %
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at GlobSkipE}
+%    \begin{macrocode}
+\skipdef\ltx at GlobSkipE=9 %
+%    \end{macrocode}
+%    \end{macro}
+%
+%
+% \subsection{Argument killers}
+%
+%    \begin{macro}{\ltx at gobble}
+%    \begin{macrocode}
+\long\def\ltx at gobble#1{}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at gobbletwo}
+%    \begin{macrocode}
+\long\def\ltx at gobbletwo#1#2{}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at gobblethree}
+%    \begin{macrocode}
+\long\def\ltx at gobblethree#1#2#3{}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at gobblefour}
+%    \begin{macrocode}
+\long\def\ltx at gobblefour#1#2#3#4{}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at GobbleNum}
+%    \begin{macrocode}
+\def\ltx at GobbleNum#1{%
+  \romannumeral
+  \csname ltx at zero%
+  \expandafter\LTXcmds at GobbleNum
+  \romannumeral\LTXcmds at num{#1}000{m\endcsname}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at GobbleNum}
+%    \begin{macrocode}
+\def\LTXcmds at GobbleNum#1{%
+  \csname LTXcmds at G#1\LTXcmds at GobbleNum
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at Gm}
+%    \begin{macrocode}
+\long\def\LTXcmds at Gm#1{%
+  \endcsname
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Argument grabbers}
+%
+%    \begin{macro}{\ltx at firstofone}
+%    \begin{macrocode}
+\long\def\ltx at firstofone#1{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at firstoftwo}
+%    \begin{macrocode}
+\long\def\ltx at firstoftwo#1#2{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at secondoftwo}
+%    \begin{macrocode}
+\long\def\ltx at secondoftwo#1#2{#2}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at firstofthree}
+%    \begin{macrocode}
+\long\def\ltx at firstofthree#1#2#3{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at secondofthree}
+%    \begin{macrocode}
+\long\def\ltx at secondofthree#1#2#3{#2}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at thirdofthree}
+%    \begin{macrocode}
+\long\def\ltx at thirdofthree#1#2#3{#3}%
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at firstoffour}
+%    \begin{macrocode}
+\long\def\ltx at firstoffour#1#2#3#4{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at secondoffour}
+%    \begin{macrocode}
+\long\def\ltx at secondoffour#1#2#3#4{#2}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at thirdoffour}
+%    \begin{macrocode}
+\long\def\ltx at thirdoffour#1#2#3#4{#3}%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at fourthoffour}
+%    \begin{macrocode}
+\long\def\ltx at fourthoffour#1#2#3#4{#4}%
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{List helpers}
+%
+%    \begin{macro}{\ltx at carzero}
+%    \begin{macrocode}
+\long\def\ltx at carzero#1\@nil{}%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at cdrzero}
+%    \begin{macrocode}
+\long\def\LTXcmds at cdrzero#1\@nil{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cdrzero}
+%    \begin{macrocode}
+\def\ltx at cdrzero{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at car}
+%    \begin{macrocode}
+\long\def\ltx at car#1#2\@nil{#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cdr}
+%    \begin{macrocode}
+\long\def\ltx at cdr#1{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at cartwo}
+%    \begin{macrocode}
+\long\def\ltx at cartwo#1#2#3\@nil{#1#2}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at carsecond}
+%    \begin{macrocode}
+\long\def\ltx at carsecond#1#2#3\@nil{#2}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cdrtwo}
+%    \begin{macrocode}
+\long\def\ltx at cdrtwo#1#2{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at carthree}
+%    \begin{macrocode}
+\long\def\ltx at carthree#1#2#3#4\@nil{#1#2#3}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at carthird}
+%    \begin{macrocode}
+\long\def\ltx at carthird#1#2#3#4\@nil{#3}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cdrthree}
+%    \begin{macrocode}
+\long\def\ltx at cdrthree#1#2#3{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at carfour}
+%    \begin{macrocode}
+\long\def\ltx at carfour#1#2#3#4#5\@nil{#1#2#3#4}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at carfourth}
+%    \begin{macrocode}
+\long\def\ltx at carfourth#1#2#3#4#5\@nil{#4}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at cdrfour}
+%    \begin{macrocode}
+\long\def\ltx at cdrfour#1#2#3#4{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at CarNum}
+%    \begin{macrocode}
+\def\ltx at CarNum#1{%
+  \romannumeral
+  \csname LTXcmds at CarNumFinish%
+  \expandafter\LTXcmds at CarNum
+  \romannumeral\LTXcmds at num{#1}000{x\endcsname}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at CarNum}
+%    \begin{macrocode}
+\def\LTXcmds at CarNum#1{%
+  \csname LTXcmds at C#1\LTXcmds at CarNum
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at Cm}
+%    \begin{macrocode}
+\long\def\LTXcmds at Cm#1#2{%
+  \endcsname{#1#2}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at Cx}
+%    \begin{macrocode}
+\def\LTXcmds at Cx#1{%
+  \endcsname{}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at CarNumFinish}
+%    \begin{macrocode}
+\long\def\LTXcmds at CarNumFinish#1#2\@nil{%
+  \ltx at zero
+  #1%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at CarNumth}
+%    \begin{macrocode}
+\def\ltx at CarNumth#1{%
+  \romannumeral
+  \expandafter\expandafter\expandafter
+  \LTXcmds at CarNumth
+  \ltx at GobbleNum{#1}{}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at CarNumth}
+%    \begin{macrocode}
+\long\def\LTXcmds at CarNumth#1#2\@nil{%
+  \ltx at zero
+  #1%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at CdrNum}
+%    \begin{macrocode}
+\def\ltx at CdrNum#1{%
+  \romannumeral%
+  \expandafter\expandafter\expandafter\ltx at cdrzero
+  \expandafter\expandafter\expandafter\ltx at zero
+  \ltx at GobbleNum{#1}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Tail recursion}
+%
+%    \begin{macro}{\ltx at ReturnAfterFi}
+%    \begin{macrocode}
+\long\def\ltx at ReturnAfterFi#1\fi{\fi#1}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ReturnAfterElseFi}
+%    \begin{macrocode}
+\long\def\ltx at ReturnAfterElseFi#1\else#2\fi{\fi#1}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Empty macro}
+%
+%    \begin{macro}{\ltx at empty}
+%    \begin{macrocode}
+\def\ltx at empty{}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Characters}
+%
+%    \begin{macro}{\ltx at space}
+%    \begin{macrocode}
+\def\ltx at space{ }
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at percentchar}
+%    \begin{macrocode}
+\begingroup
+  \lccode`0=`\%\relax
+\lowercase{\endgroup
+  \def\ltx at percentchar{0}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at backslashchar}
+%    \begin{macrocode}
+\begingroup
+  \lccode`0=`\\\relax
+\lowercase{\endgroup
+  \def\ltx at backslashchar{0}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at hashchar}
+%    \begin{macrocode}
+\begingroup
+  \lccode`0=`\#\relax
+\lowercase{\endgroup
+  \def\ltx at hashchar{0}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at leftbracechar}
+%    \begin{macrocode}
+\begingroup
+  \lccode`0=`\{\relax
+\lowercase{\endgroup
+  \def\ltx at leftbracechar{0}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at rightbracechar}
+%    \begin{macrocode}
+\begingroup
+  \lccode`0=`\}\relax
+\lowercase{\endgroup
+  \def\ltx at rightbracechar{0}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Boolean switch}
+%
+%    \begin{macro}{\ltx at newif}
+%    \begin{macrocode}
+\def\ltx at newif#1{%
+  \begingroup
+    \escapechar=-1 %
+  \expandafter\endgroup
+  \expandafter\LTXcmds at newif\string#1\@nil
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at newif}
+%    \begin{macrocode}
+\begingroup
+  \escapechar=-1 %
+\expandafter\endgroup
+\expandafter\def\expandafter\LTXcmds at 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 at newglobalif}
+%    \begin{macrocode}
+\def\ltx at newglobalif#1{%
+  \begingroup
+    \escapechar=-1 %
+  \expandafter\endgroup
+  \expandafter\LTXcmds at newglobalif\string#1\@nil
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at newglobalif}
+%    \begin{macrocode}
+\begingroup
+  \escapechar=-1 %
+\expandafter\endgroup
+\expandafter
+\def\expandafter\LTXcmds at 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 at LocalExpandAfter}
+%    \begin{macrocode}
+\def\ltx at LocalExpandAfter{%
+  \begingroup
+    \expandafter\expandafter\expandafter
+  \endgroup
+  \expandafter
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macrocode}
+\ltx at LocalExpandAfter
+\ifx\csname ifcsname\endcsname\relax
+%    \end{macrocode}
+%    \begin{macro}{\ltx at ifundefined}
+%    \begin{macrocode}
+  \def\ltx at ifundefined#1{%
+    \expandafter\ifx\csname #1\endcsname\relax
+      \expandafter\ltx at firstoftwo
+    \else
+      \expandafter\ltx at secondoftwo
+    \fi
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at IfUndefined}
+%    \begin{macrocode}
+  \def\ltx at IfUndefined#1{%
+    \begingroup\expandafter\expandafter\expandafter\endgroup
+    \expandafter\ifx\csname #1\endcsname\relax
+      \expandafter\ltx at firstoftwo
+    \else
+      \expandafter\ltx at secondoftwo
+    \fi
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macrocode}
+  \expandafter\ltx at gobble
+\else
+  \expandafter\ltx at firstofone
+\fi
+{%
+%    \end{macrocode}
+%    \begin{macro}{\ltx at ifundefined}
+%    \begin{macrocode}
+  \def\ltx at ifundefined#1{%
+    \ifcsname #1\endcsname
+      \expandafter\ifx\csname #1\endcsname\relax
+        \expandafter\expandafter\expandafter\ltx at firstoftwo
+      \else
+        \expandafter\expandafter\expandafter\ltx at secondoftwo
+      \fi
+    \else
+      \expandafter\ltx at firstoftwo
+    \fi
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at IfUndefined}
+%    \begin{macrocode}
+  \let\ltx at IfUndefined\ltx at ifundefined
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+%
+% \subsection{Stripping}
+%
+%    \begin{macro}{\ltx at RemovePrefix}
+%    \begin{macrocode}
+\def\ltx at RemovePrefix#1>{}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at StripPrefix}
+%    \begin{macrocode}
+\def\ltx at StripPrefix{%
+  \expandafter\ltx at RemovePrefix
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at onelevel@sanitize}
+%    \begin{macrocode}
+\def\ltx at onelevel@sanitize#1{%
+  \edef#1{%
+    \expandafter
+    \ltx at RemovePrefix\meaning#1%
+  }%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{File management}
+%
+% \subsubsection{File extensions}
+%
+%    \begin{macro}{\ltx at clsextension}
+%    \begin{macrocode}
+\def\ltx at clsextension{cls}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at pkgextension}
+%    \begin{macrocode}
+\def\ltx at pkgextension{sty}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsubsection{Load check}
+%
+%    \begin{macro}{\ltx at iffileloaded}
+%    \begin{macrocode}
+\def\ltx at iffileloaded#1{%
+  \ltx at ifundefined{ver@#1}\ltx at secondoftwo\ltx at firstoftwo
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ifclassloaded}
+%    \begin{macrocode}
+\def\ltx at ifclassloaded#1{%
+  \ltx at iffileloaded{#1.\ltx at clsextension}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ifpackageloaded}
+%    \begin{macrocode}
+\def\ltx at ifpackageloaded#1{%
+  \ltx at iffileloaded{#1.\ltx at pkgextension}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsubsection{Version date check}
+%
+%    \begin{macro}{\ltx at iffilelater}
+%    \begin{macrocode}
+\def\ltx at iffilelater#1#2{%
+  \ltx at iffileloaded{#1}{%
+    \expandafter\LTXcmds at IfLater\expandafter{%
+      \number
+      \expandafter\expandafter\expandafter\LTXcmds at ParseVersion
+      \expandafter\expandafter\expandafter{%
+        \csname ver@#1\endcsname
+      }%
+    \expandafter}\expandafter{%
+      \number
+      \expandafter\LTXcmds at ParseVersion\expandafter{#2}%
+    }%
+  }\ltx at secondoftwo
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at IfLater}
+%    \begin{macrocode}
+\def\LTXcmds at IfLater#1#2{%
+  \ifcase 0%
+      \ifnum#1<19940101 %
+      \else
+        \ifnum#2<19940101 %
+        \else
+          \ifnum#2>#1 %
+          \else
+            1%
+          \fi
+        \fi
+      \fi
+      \ltx at space
+    \expandafter\ltx at secondoftwo
+  \else
+    \expandafter\ltx at firstoftwo
+  \fi
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ifclasslater}
+%    \begin{macrocode}
+\def\ltx at ifclasslater#1{%
+  \ltx at iffilelater{#1.\ltx at clsextension}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ifpackagelater}
+%    \begin{macrocode}
+\def\ltx at ifpackagelater#1{%
+  \ltx at iffilelater{#1.\ltx at pkgextension}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macrocode}
+\ltx at IfUndefined{pdfmatch}{%
+%    \end{macrocode}
+%    \begin{macro}{\LTXcmds at ParseVersion}
+%    \begin{macrocode}
+  \def\LTXcmds at 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 at ParseVersion}
+%    \begin{macrocode}
+  \def\LTXcmds at 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 at StripPrefix\pdflastmatch1 %
+      \ltx at StripPrefix\pdflastmatch2 %
+      \ltx at StripPrefix\pdflastmatch3 %
+    \else
+      0%
+    \fi
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+%
+% \subsection{Macro additions}
+%
+%    \begin{macro}{\ltx at GlobalAppendToMacro}
+%    \begin{macrocode}
+\long\def\ltx at GlobalAppendToMacro#1#2{%
+  \ifx\ltx at undefined#1%
+    \let#1\ltx at empty
+  \else
+    \ifx\relax#1%
+      \let#1\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA\expandafter{#1#2}%
+    \xdef#1{\the\ltx at LocToksA}%
+  \endgroup
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocalAppendToMacro}
+%    \begin{macrocode}
+\long\def\ltx at LocalAppendToMacro#1#2{%
+  \global\let\LTXcmds at gtemp#1%
+  \ifx\ltx at undefined\LTXcmds at gtemp
+    \global\let\LTXcmds at gtemp\ltx at empty
+  \else
+    \ifx\relax\LTXcmds at gtemp
+      \global\letLTXcmds at gtemp\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA\expandafter{\LTXcmds at gtemp#2}%
+    \xdef\LTXcmds at gtemp{\the\ltx at LocToksA}%
+  \endgroup
+  \let#1\LTXcmds at gtemp
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at GlobalPrependToMacro}
+%    \begin{macrocode}
+\long\def\ltx at GlobalPrependToMacro#1#2{%
+  \ifx\ltx at undefined#1%
+    \let#1\ltx at empty
+  \else
+    \ifx\relax#1%
+      \let#1\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA{#2}%
+    \ltx at LocToksB\expandafter{#1}%
+    \xdef#1{\the\ltx at LocToksA\the\ltx at LocToksB}%
+  \endgroup
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at LocalPrependToMacro}
+%    \begin{macrocode}
+\long\def\ltx at LocalPrependToMacro#1#2{%
+  \global\let\LTXcmds at gtemp#1%
+  \ifx\ltx at undefined\LTXcmds at gtemp
+    \global\let\LTXcmds at gtemp\ltx at empty
+  \else
+    \ifx\relax\LTXcmds at gtemp
+      \global\letLTXcmds at gtemp\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA{#2}%
+    \ltx at LocToksB\expandafter{\LTXcmds at gtemp}%
+    \xdef\LTXcmds at gtemp{\the\ltx at LocToksA\the\ltx at LocToksB}%
+  \endgroup
+  \let#1\LTXcmds at gtemp
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Next character detection}
+%
+%    \begin{macro}{\ltx at ifnextchar}
+%    \begin{macrocode}
+\long\def\ltx at ifnextchar#1#2#3{%
+  \begingroup
+  \let\LTXcmds at CharToken= #1\relax
+  \ltx at LocToksA{\endgroup#2}%
+  \ltx at LocToksB{\endgroup#3}%
+  \futurelet\LTXcmds at LetToken\LTXcmds at ifnextchar
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at ifnextchar}
+%    \begin{macrocode}
+\def\LTXcmds at ifnextchar{%
+  \ifx\LTXcmds at LetToken\LTXcmds at CharToken
+    \the\expandafter\ltx at LocToksA
+  \else
+    \expandafter
+      \ifx\csname LTXcmds at LetToken\endcsname\LTXcmds at SpaceToken
+      \expandafter\expandafter\expandafter\LTXcmds@@ifnextchar
+    \else
+      \the\expandafter\expandafter\expandafter\ltx at 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 at LetToken
+  \expandafter\LTXcmds at ifnextchar
+  \romannumeral-`\.%
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at SpaceToken}
+%    \begin{macrocode}
+\ltx at firstofone{\let\LTXcmds at SpaceToken= } %
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at ifnextchar@nospace}
+%    \begin{macrocode}
+\long\def\ltx at ifnextchar@nospace#1#2#3{%
+  \begingroup
+  \let\LTXcmds at CharToken= #1\relax
+  \ltx at LocToksA{\endgroup#2}%
+  \ltx at LocToksB{\endgroup#3}%
+  \futurelet\LTXcmds at LetToken\LTXcmds at ifnextchar@nospace
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at ifnextchar@nospace}
+%    \begin{macrocode}
+\def\LTXcmds at ifnextchar@nospace{%
+  \the
+  \ifx\LTXcmds at LetToken\LTXcmds at CharToken
+    \expandafter\ltx at LocToksA
+  \else
+    \expandafter\ltx at LocToksB
+  \fi
+}
+%    \end{macrocode}
+%    \end{macro}
+% \subsection{\cs{ltx at leavevmode}, \cs{ltx at mbox}}
+%
+%    \begin{macro}{\ltx at leavevmode}
+%    \begin{macrocode}
+\ltx at IfUndefined{quitvmode}{%
+  \ltx at IfUndefined{leavevmode}{%
+    \ltx at IfUndefined{voidb at x}{%
+      \ltx at IfUndefined{newbox}{%
+        \def\ltx at leavevmode{%
+          \begingroup
+            \setbox\ltx at zero=\hbox{}%
+            \begingroup
+              \setbox\ltx at zero=\hbox{\box\ltx at zero}%
+            \endgroup
+            \unhbox\ltx at zero
+          \endgroup
+        }%
+      }{%
+        \csname newbox\endcsname\LTXcmds at VoidBox
+        \ifvoid\LTXcmds at VoidBox
+        \else
+          \setbox\LTXcmds at VoidBox=\hbox{}%
+          \begingroup
+            \setbox\LTXcmds at VoidBox=\hbox{\box\LTXcmds at VoidBox}%
+          \endgroup
+        \fi
+        \def\ltx at leavevmode{\unhbox\LTXcmds at VoidBox}%
+      }%
+    }{%
+      \def\ltx at leavevmode{\unhbox\voidb at x}%
+    }%
+  }{%
+    \let\ltx at leavevmode\leavevmode
+  }%
+}{%
+  \let\ltx at leavevmode\quitvmode
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at mbox}
+%    \begin{macrocode}
+\def\ltx at mbox{%
+  \ltx at leavevmode
+  \hbox
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Help macros}
+%
+%    \begin{macro}{\LTXcmds at num}
+%    \begin{macrocode}
+\ltx at IfUndefined{numexpr}{%
+  \def\LTXcmds at num#1{%
+    \expandafter\ltx at firstofone\expandafter{%
+      \number#1%
+    }%
+  }%
+}{%
+  \def\LTXcmds at num#1{%
+    \expandafter\ltx at firstofone\expandafter{%
+      \the\numexpr#1%
+    }%
+  }%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{Expandable test for emptiness}
+%
+%    \begin{macrocode}
+\ltx at IfUndefined{detokenize}{%
+%    \end{macrocode}
+%
+% \subsubsection{Vanilla \hologo{TeX}}
+%
+%    \begin{macro}{\ltx at 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 at temp#1{%
+    \long\def\ltx at ifempty##1{%
+      \romannumeral0%
+      \iffalse{\fi
+        \expandafter\ltx at gobble\expandafter{%
+          \expandafter{\string##1}%
+          \expandafter\ltx at gobble\string
+        }%
+        \expandafter\ltx at firstofthree\expandafter
+        {\iffalse}\fi
+        \expandafter#1\ltx at secondoftwo
+      }%
+      \expandafter#1\ltx at firstoftwo
+    }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\ltx at ifblank}
+%    \begin{macrocode}
+    \long\def\ltx at ifblank##1{%
+      \romannumeral0%
+      \iffalse{\fi
+        \expandafter\expandafter\expandafter\ltx at gobble
+        \expandafter\expandafter\expandafter{%
+          \expandafter\expandafter\expandafter{%
+            \expandafter\string\ltx at gobble##1.%
+          }%
+          \expandafter\ltx at gobble\string
+        }%
+        \expandafter\ltx at firstofthree\expandafter
+        {\iffalse}\fi
+        \expandafter#1\ltx at secondoftwo
+      }%
+      \expandafter#1\ltx at firstoftwo
+    }%
+  }%
+  \LTXcmds at 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 at ifempty}
+%    \begin{macrocode}
+  \long\def\ltx at ifempty#1{%
+    \romannumeral%
+    \csname
+      LTXcmds at ifempty%
+      \ifcat$\detokenize{#1}$%
+        @%
+      \fi
+    \endcsname
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at ifempty@}
+%    \begin{macrocode}
+  \long\def\LTXcmds at ifempty@#1#2{0 #1}%
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at ifempty}
+%    \begin{macrocode}
+  \long\def\LTXcmds at ifempty#1#2{0 #2}%
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsubsection{\cs{ltx at ifblank}}
+%
+%    \begin{macro}{\ltx at ifblank}
+%    \begin{macrocode}
+  \long\def\ltx at ifblank#1{%
+    \romannumeral%
+    \csname
+      LTXcmds at ifempty%
+      \ifcat$\detokenize\expandafter{\ltx at gobble#1.}$%
+        @%
+      \fi
+    \endcsname
+  }%
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macrocode}
+}
+%    \end{macrocode}
+%
+% \subsection{\cs{ltx at zapspace}}
+%
+%    \begin{macro}{\ltx at zapspace}
+%    \begin{macrocode}
+\long\def\ltx at zapspace#1{%
+  \romannumeral
+  \LTXcmds at zapspace\ltx at zero#1 \@nil
+}
+%    \end{macrocode}
+%    \end{macro}
+%    \begin{macro}{\LTXcmds at zapspace}
+%    \begin{macrocode}
+\long\def\LTXcmds at zapspace#1 #2\@nil{%
+  \ltx at ifempty{#2}{%
+    #1%
+  }{%
+    \LTXcmds at zapspace#1#2\@nil
+  }%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+% \subsection{\cs{ltx at 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 at IfUndefined{lastnodetype}{%
+  \catcode`\$=9 %
+  \catcode`\&=14 %
+}{%
+  \catcode`\$=14 %
+  \catcode`\&=9 %
+}
+%    \end{macrocode}
+%    \begin{macro}{\ltx at IfBoxEmpty}
+%    \begin{macrocode}
+\def\ltx at IfBoxEmpty#1{%
+  \ifvoid#1\relax
+    \expandafter\ltx at secondoftwo
+  \else
+%    \end{macrocode}
+%    Implementation using \hologo{eTeX}'s \cs{lastnodetype}.
+%    \begin{macrocode}
+&   \begingroup
+&     \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+&       \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+&       \expandafter
+&     }%
+&   \expandafter\endgroup
+&   \ifnum\lastnodetype<\ltx at zero
+&     \expandafter\expandafter\expandafter\ltx at firstoftwo
+&   \else
+&     \expandafter\expandafter\expandafter\ltx at secondoftwo
+&   \fi
+%    \end{macrocode}
+%    Implementation without \hologo{eTeX} using a signature
+%    at the beginning of the test box.
+%    \begin{macrocode}
+$   \begingroup
+$     \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+$       \penalty\ltx at one
+$       \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$       \expandafter
+$     }%
+$     \ifnum\lastpenalty=\ltx at one
+%    \end{macrocode}
+%    Box 0 has been changed and is restored by
+%    closing the group.
+%    \begin{macrocode}
+$       \endgroup
+$       \begingroup
+$       \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+$         \penalty\ltx at two
+$         \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$         \expandafter
+$       }%
+$       \ifnum\lastpenalty=\ltx at two
+$         \def\next{\endgroup\expandafter\ltx at firstoftwo}%
+$       \else
+$         \def\next{\endgroup\expandafter\ltx at secondoftwo}%
+$       \fi
+$     \else
+$       \def\next{\endgroup\expandafter\ltx at secondoftwo}%
+$     \fi
+$   \next
+  \fi
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macro}{\ltx at IfBoxVoidOrEmpty}
+%    \begin{macrocode}
+\def\ltx at IfBoxVoidOrEmpty#1{%
+  \ifvoid#1\relax
+    \expandafter\ltx at thirdoffour
+  \fi
+  \ltx at IfBoxEmpty{#1}%
+}
+%    \end{macrocode}
+%    \end{macro}
+%
+%    \begin{macrocode}
+\LTXcmds at 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 at 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$1 at news.albasani.net},
+% 2010-11-12.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/803bd57221a04996}}
+%
+% \bibitem{ifstrempty:musa}
+% Ahmed Musa:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:f5496afe-40ed-42bd-b629-a2419ecf7c0d at o14g2000prn.googlegroups.com},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/fbf7d61a0c3a807d}}
+%
+% \bibitem{ifstrempty:diez1}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idbo94$uka$1 at four.albasani.net},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/0c230ee479487962}}
+%
+% \bibitem{ifstrempty:diez2}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idbpu4$cg1$1 at news.albasani.net},
+% 2010-12-03.\\
+% {\small
+% \url{https://groups.google.com/group/comp.text.tex/msg/bbef4263390d647b}}
+%
+% \bibitem{ifstrempty:diez3}
+% Ulrich Diez:
+% \textit{Re: TeX refuses to strip outer braces in argument};
+% newsgroup \xnewsgroup{comp.text.tex},
+% \url{news:idd4ga$r83$1 at 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 at 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 at 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 at IfUndefined} added.
+%   \end{Version}
+%   \begin{Version}{2010/01/28 v1.2}
+%   \item
+%     \cs{ltx at RemovePrefix} and \cs{ltx at StripPrefix} added.
+%   \item
+%     \cs{ltx at ifclassloaded}, \cs{ltx at ifpackageloaded},
+%     \cs{ltx at iffileloaded},
+%     \cs{ltx at ifclasslater}, \cs{ltx at ifpackagelater},
+%     \cs{ltx at iffilelater},
+%     \cs{ltx at clsextension}, \cs{ltx at pkgextension} added.
+%   \item
+%     \cs{ltx at GlobalAppendToMacro}, \cs{ltx at LocalAppendToMacro} added.
+%   \end{Version}
+%   \begin{Version}{2010/03/01 v1.3}
+%   \item
+%     \cs{ltx at newif} added.
+%   \item
+%     \cs{ltx at ifnextchar} added.
+%   \item
+%     Numbers \cs{ltx at zero}, \cs{ltx at one}, \cs{ltx at two}, \cs{ltx at cclv} added.
+%   \end{Version}
+%   \begin{Version}{2010/03/09 v1.4}
+%   \item
+%     \cs{ltx at pkgextension} and \cs{ltx at clsextension} are hardcoded to
+%     avoid trouble with \cs{@onlypreamble}.
+%   \end{Version}
+%   \begin{Version}{2010/04/08 v1.5}
+%   \item
+%     \cs{ltx at cartwo}, \cs{ltx at cdrtwo},
+%     \cs{ltx at carthree}, \cs{ltx at cdrthree},
+%     \cs{ltx at carfour}, \cs{ltx at cdrfour} added.
+%   \item
+%     \cs{ltx at ReturnAfterFi} and \cs{ltx at ReturnAfterElseFi} fixed.
+%   \end{Version}
+%   \begin{Version}{2010/04/16 v1.6}
+%   \item
+%     \cs{ltx at leavevmode}, \cs{ltx at mbox} added.
+%   \end{Version}
+%   \begin{Version}{2010/04/26 v1.7}
+%   \item
+%     \cs{ltx at GobbleNum}, \cs{ltx at CdrNum}, \cs{ltx at CarNum} added.
+%   \item
+%     \cs{ltx at carzero}, \cs{ltx at cdrzero} added.
+%   \item
+%     \cs{ltx at hashchar} added.
+%   \end{Version}
+%   \begin{Version}{2010/09/11 v1.8}
+%   \item
+%     \cs{ltx at leftbracechar}, \cs{ltx at rightbracechar} added.
+%   \end{Version}
+%   \begin{Version}{2010/10/25 v1.9}
+%   \item
+%     \cs{ltx at LocalAppendToMacro} and \cs{ltx at GlobalAppendToMacro} are
+%     now \cs{long}.
+%   \end{Version}
+%   \begin{Version}{2010/10/31 v1.10}
+%   \item
+%     \cs{ltx at newglobalif} added.
+%   \end{Version}
+%   \begin{Version}{2010/11/12 v1.11}
+%   \item
+%     \cs{ltx at ifempty} added.
+%   \item
+%     \cs{ltx at firstofthree}, \cs{ltx at secondofthree}, \cs{ltx at thirdofthree}
+%     added.
+%   \end{Version}
+%   \begin{Version}{2010/12/02 v1.12}
+%   \item
+%     \cs{ltx at onelevel@sanitize} added.
+%   \item
+%     \cs{LTXcmds at num} fixed for the case with \cs{numexpr}
+%     (bug found by GL).
+%   \end{Version}
+%   \begin{Version}{2010/12/04 v1.13}
+%   \item
+%     \cs{ltx at ifblank} added.
+%   \item
+%     Optimization for \cs{ltx at ifempty}.
+%   \end{Version}
+%   \begin{Version}{2010/12/07 v1.14}
+%   \item
+%     \cs{ltx at zapspace} added.
+%   \end{Version}
+%   \begin{Version}{2010/12/12 v1.15}
+%   \item
+%     \cs{ltx at minusone} added.
+%   \end{Version}
+%   \begin{Version}{2011/02/04 v1.16}
+%   \item
+%     \cs{ltx at IfBoxEmpty} and \cs{ltx at IfBoxVoidOrEmpty} added.
+%   \item
+%     \cs{ltx at firstoffour}, \dots, \cs{ltx at fourthoffour} added.
+%   \end{Version}
+%   \begin{Version}{2011/02/05 v1.17}
+%   \item
+%     \cs{ltx at IfBoxEmpty}: an empty box may have non-zero dimensions.
+%   \end{Version}
+%   \begin{Version}{2011/03/16 v1.18}
+%   \item
+%     \cs{ltx at ifclasslater} fixed.
+%   \end{Version}
+%   \begin{Version}{2011/04/14 v1.19}
+%   \item
+%     \cs{ltx at 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 at ifnextchar} with conditional support (thanks GL for
+%     bug report).
+%   \end{Version}
+%   \begin{Version}{2011/08/22 v1.21}
+%   \item
+%     \cs{ltx at GlobalPrependToMacro}, \cs{ltx at LocalPrependToMacro} added
+%     (feature request of Martin M\"unch).
+%   \end{Version}
+%   \begin{Version}{2011/11/09 v1.22}
+%   \item
+%     \cs{ltx at carsecond}, \cs{ltx at carthird}, \cs{ltx at carfourth},
+%     \cs{ltx at CarNumth} added.
+%   \item
+%     \cs{ltx at cdrzero}, \cs{ltx at cdr}, \cs{ltx at cdrtwo}, cs{ltx at cdrthree},
+%     \cs{ltx at cdrfour}, \cs{ltx at 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


Property changes on: trunk/Master/texmf-dist/source/latex/ltxcmds/ltxcmds.dtx
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: trunk/Master/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty
===================================================================
--- trunk/Master/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty	                        (rev 0)
+++ trunk/Master/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty	2019-12-17 23:21:23 UTC (rev 53165)
@@ -0,0 +1,752 @@
+%%
+%% This is file `ltxcmds.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% ltxcmds.dtx  (with options: `package')
+%% 
+%% 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.
+%% 
+\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 at 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%
+\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 at ltxcmds.sty\endcsname
+\ProvidesPackage{ltxcmds}%
+  [2019/12/15 v1.24 LaTeX kernel commands for general use (HO)]%
+\begingroup\catcode61\catcode48\catcode32=10\relax%
+  \catcode13=5 % ^^M
+  \endlinechar=13 %
+  \catcode123=1 % {
+  \catcode125=2 % }
+  \catcode64=11 % @
+  \def\x{\endgroup
+    \expandafter\edef\csname LTXcmds at 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 at EnsureCode#1#2{%
+  \edef\LTXcmds at AtEnd{%
+    \LTXcmds at AtEnd
+    \catcode#1=\the\catcode#1\relax
+  }%
+  \catcode#1=#2\relax
+}
+\TMP at EnsureCode{36}{3}% $
+\TMP at EnsureCode{38}{4}% &
+\TMP at EnsureCode{40}{12}% (
+\TMP at EnsureCode{41}{12}% )
+\TMP at EnsureCode{45}{12}% -
+\TMP at EnsureCode{46}{12}% .
+\TMP at EnsureCode{47}{12}% /
+\TMP at EnsureCode{60}{12}% <
+\TMP at EnsureCode{62}{12}% >
+\TMP at EnsureCode{91}{12}% [
+\TMP at EnsureCode{96}{12}% `
+\TMP at EnsureCode{93}{12}% ]
+\TMP at EnsureCode{94}{12}% ^ (superscript) (!)
+\TMP at EnsureCode{124}{12}% |
+\edef\LTXcmds at AtEnd{\LTXcmds at AtEnd\noexpand\endinput}
+\chardef\ltx at zero=0 %
+\chardef\ltx at one=1 %
+\chardef\ltx at two=2 %
+\chardef\ltx at active=13 %
+\chardef\ltx at cclv=255 %
+\def\ltx at minusone{%
+  -\ltx at one
+}
+\toksdef\ltx at LocToksA=0 %
+\toksdef\ltx at LocToksB=2 %
+\toksdef\ltx at LocToksC=4 %
+\toksdef\ltx at LocToksD=6 %
+\toksdef\ltx at LocToksE=8 %
+\toksdef\ltx at GlobToksA=1 %
+\toksdef\ltx at GlobToksB=3 %
+\toksdef\ltx at GlobToksC=5 %
+\toksdef\ltx at GlobToksD=7 %
+\toksdef\ltx at GlobToksE=9 %
+\dimendef\ltx at LocDimenA=0 %
+\dimendef\ltx at LocDimenB=2 %
+\dimendef\ltx at LocDimenC=4 %
+\dimendef\ltx at LocDimenD=6 %
+\dimendef\ltx at LocDimenE=8 %
+\dimendef\ltx at GlobDimenA=1 %
+\dimendef\ltx at GlobDimenB=3 %
+\dimendef\ltx at GlobDimenC=5 %
+\dimendef\ltx at GlobDimenD=7 %
+\dimendef\ltx at GlobDimenE=9 %
+\skipdef\ltx at LocSkipA=0 %
+\skipdef\ltx at LocSkipB=2 %
+\skipdef\ltx at LocSkipC=4 %
+\skipdef\ltx at LocSkipD=6 %
+\skipdef\ltx at LocSkipE=8 %
+\skipdef\ltx at GlobSkipA=1 %
+\skipdef\ltx at GlobSkipB=3 %
+\skipdef\ltx at GlobSkipC=5 %
+\skipdef\ltx at GlobSkipD=7 %
+\skipdef\ltx at GlobSkipE=9 %
+\long\def\ltx at gobble#1{}
+\long\def\ltx at gobbletwo#1#2{}
+\long\def\ltx at gobblethree#1#2#3{}
+\long\def\ltx at gobblefour#1#2#3#4{}
+\def\ltx at GobbleNum#1{%
+  \romannumeral
+  \csname ltx at zero%
+  \expandafter\LTXcmds at GobbleNum
+  \romannumeral\LTXcmds at num{#1}000{m\endcsname}%
+}
+\def\LTXcmds at GobbleNum#1{%
+  \csname LTXcmds at G#1\LTXcmds at GobbleNum
+}
+\long\def\LTXcmds at Gm#1{%
+  \endcsname
+}
+\long\def\ltx at firstofone#1{#1}
+\long\def\ltx at firstoftwo#1#2{#1}
+\long\def\ltx at secondoftwo#1#2{#2}
+\long\def\ltx at firstofthree#1#2#3{#1}
+\long\def\ltx at secondofthree#1#2#3{#2}
+\long\def\ltx at thirdofthree#1#2#3{#3}%
+\long\def\ltx at firstoffour#1#2#3#4{#1}
+\long\def\ltx at secondoffour#1#2#3#4{#2}
+\long\def\ltx at thirdoffour#1#2#3#4{#3}%
+\long\def\ltx at fourthoffour#1#2#3#4{#4}%
+\long\def\ltx at carzero#1\@nil{}%
+\long\def\LTXcmds at cdrzero#1\@nil{#1}
+\def\ltx at cdrzero{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+\long\def\ltx at car#1#2\@nil{#1}
+\long\def\ltx at cdr#1{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+\long\def\ltx at cartwo#1#2#3\@nil{#1#2}
+\long\def\ltx at carsecond#1#2#3\@nil{#2}
+\long\def\ltx at cdrtwo#1#2{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+\long\def\ltx at carthree#1#2#3#4\@nil{#1#2#3}
+\long\def\ltx at carthird#1#2#3#4\@nil{#3}
+\long\def\ltx at cdrthree#1#2#3{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+\long\def\ltx at carfour#1#2#3#4#5\@nil{#1#2#3#4}
+\long\def\ltx at carfourth#1#2#3#4#5\@nil{#4}
+\long\def\ltx at cdrfour#1#2#3#4{%
+  \romannumeral\LTXcmds at cdrzero\ltx at zero
+}
+\def\ltx at CarNum#1{%
+  \romannumeral
+  \csname LTXcmds at CarNumFinish%
+  \expandafter\LTXcmds at CarNum
+  \romannumeral\LTXcmds at num{#1}000{x\endcsname}%
+}
+\def\LTXcmds at CarNum#1{%
+  \csname LTXcmds at C#1\LTXcmds at CarNum
+}
+\long\def\LTXcmds at Cm#1#2{%
+  \endcsname{#1#2}%
+}
+\def\LTXcmds at Cx#1{%
+  \endcsname{}%
+}
+\long\def\LTXcmds at CarNumFinish#1#2\@nil{%
+  \ltx at zero
+  #1%
+}
+\def\ltx at CarNumth#1{%
+  \romannumeral
+  \expandafter\expandafter\expandafter
+  \LTXcmds at CarNumth
+  \ltx at GobbleNum{#1}{}%
+}
+\long\def\LTXcmds at CarNumth#1#2\@nil{%
+  \ltx at zero
+  #1%
+}
+\def\ltx at CdrNum#1{%
+  \romannumeral%
+  \expandafter\expandafter\expandafter\ltx at cdrzero
+  \expandafter\expandafter\expandafter\ltx at zero
+  \ltx at GobbleNum{#1}%
+}
+\long\def\ltx at ReturnAfterFi#1\fi{\fi#1}
+\long\def\ltx at ReturnAfterElseFi#1\else#2\fi{\fi#1}
+\def\ltx at empty{}
+\def\ltx at space{ }
+\begingroup
+  \lccode`0=`\%\relax
+\lowercase{\endgroup
+  \def\ltx at percentchar{0}%
+}
+\begingroup
+  \lccode`0=`\\\relax
+\lowercase{\endgroup
+  \def\ltx at backslashchar{0}%
+}
+\begingroup
+  \lccode`0=`\#\relax
+\lowercase{\endgroup
+  \def\ltx at hashchar{0}%
+}
+\begingroup
+  \lccode`0=`\{\relax
+\lowercase{\endgroup
+  \def\ltx at leftbracechar{0}%
+}
+\begingroup
+  \lccode`0=`\}\relax
+\lowercase{\endgroup
+  \def\ltx at rightbracechar{0}%
+}
+\def\ltx at newif#1{%
+  \begingroup
+    \escapechar=-1 %
+  \expandafter\endgroup
+  \expandafter\LTXcmds at newif\string#1\@nil
+}
+\begingroup
+  \escapechar=-1 %
+\expandafter\endgroup
+\expandafter\def\expandafter\LTXcmds at 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
+}
+\def\ltx at newglobalif#1{%
+  \begingroup
+    \escapechar=-1 %
+  \expandafter\endgroup
+  \expandafter\LTXcmds at newglobalif\string#1\@nil
+}
+\begingroup
+  \escapechar=-1 %
+\expandafter\endgroup
+\expandafter
+\def\expandafter\LTXcmds at 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
+}
+\def\ltx at LocalExpandAfter{%
+  \begingroup
+    \expandafter\expandafter\expandafter
+  \endgroup
+  \expandafter
+}
+\ltx at LocalExpandAfter
+\ifx\csname ifcsname\endcsname\relax
+  \def\ltx at ifundefined#1{%
+    \expandafter\ifx\csname #1\endcsname\relax
+      \expandafter\ltx at firstoftwo
+    \else
+      \expandafter\ltx at secondoftwo
+    \fi
+  }%
+  \def\ltx at IfUndefined#1{%
+    \begingroup\expandafter\expandafter\expandafter\endgroup
+    \expandafter\ifx\csname #1\endcsname\relax
+      \expandafter\ltx at firstoftwo
+    \else
+      \expandafter\ltx at secondoftwo
+    \fi
+  }%
+  \expandafter\ltx at gobble
+\else
+  \expandafter\ltx at firstofone
+\fi
+{%
+  \def\ltx at ifundefined#1{%
+    \ifcsname #1\endcsname
+      \expandafter\ifx\csname #1\endcsname\relax
+        \expandafter\expandafter\expandafter\ltx at firstoftwo
+      \else
+        \expandafter\expandafter\expandafter\ltx at secondoftwo
+      \fi
+    \else
+      \expandafter\ltx at firstoftwo
+    \fi
+  }%
+  \let\ltx at IfUndefined\ltx at ifundefined
+}
+\def\ltx at RemovePrefix#1>{}
+\def\ltx at StripPrefix{%
+  \expandafter\ltx at RemovePrefix
+}
+\def\ltx at onelevel@sanitize#1{%
+  \edef#1{%
+    \expandafter
+    \ltx at RemovePrefix\meaning#1%
+  }%
+}
+\def\ltx at clsextension{cls}
+\def\ltx at pkgextension{sty}
+\def\ltx at iffileloaded#1{%
+  \ltx at ifundefined{ver@#1}\ltx at secondoftwo\ltx at firstoftwo
+}
+\def\ltx at ifclassloaded#1{%
+  \ltx at iffileloaded{#1.\ltx at clsextension}%
+}
+\def\ltx at ifpackageloaded#1{%
+  \ltx at iffileloaded{#1.\ltx at pkgextension}%
+}
+\def\ltx at iffilelater#1#2{%
+  \ltx at iffileloaded{#1}{%
+    \expandafter\LTXcmds at IfLater\expandafter{%
+      \number
+      \expandafter\expandafter\expandafter\LTXcmds at ParseVersion
+      \expandafter\expandafter\expandafter{%
+        \csname ver@#1\endcsname
+      }%
+    \expandafter}\expandafter{%
+      \number
+      \expandafter\LTXcmds at ParseVersion\expandafter{#2}%
+    }%
+  }\ltx at secondoftwo
+}
+\def\LTXcmds at IfLater#1#2{%
+  \ifcase 0%
+      \ifnum#1<19940101 %
+      \else
+        \ifnum#2<19940101 %
+        \else
+          \ifnum#2>#1 %
+          \else
+            1%
+          \fi
+        \fi
+      \fi
+      \ltx at space
+    \expandafter\ltx at secondoftwo
+  \else
+    \expandafter\ltx at firstoftwo
+  \fi
+}
+\def\ltx at ifclasslater#1{%
+  \ltx at iffilelater{#1.\ltx at clsextension}%
+}
+\def\ltx at ifpackagelater#1{%
+  \ltx at iffilelater{#1.\ltx at pkgextension}%
+}
+\ltx at IfUndefined{pdfmatch}{%
+  \def\LTXcmds at ParseVersion#1{%
+    \LTXcmds@@ParseVersion#10000/00/00\@nil
+  }%
+  \def\LTXcmds@@ParseVersion#1#2#3#4/#5#6/#7#8#9\@nil{%
+    #1#2#3#4#5#6#7#8%
+  }%
+}{%
+  \def\LTXcmds at 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 at StripPrefix\pdflastmatch1 %
+      \ltx at StripPrefix\pdflastmatch2 %
+      \ltx at StripPrefix\pdflastmatch3 %
+    \else
+      0%
+    \fi
+  }%
+}
+\long\def\ltx at GlobalAppendToMacro#1#2{%
+  \ifx\ltx at undefined#1%
+    \let#1\ltx at empty
+  \else
+    \ifx\relax#1%
+      \let#1\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA\expandafter{#1#2}%
+    \xdef#1{\the\ltx at LocToksA}%
+  \endgroup
+}
+\long\def\ltx at LocalAppendToMacro#1#2{%
+  \global\let\LTXcmds at gtemp#1%
+  \ifx\ltx at undefined\LTXcmds at gtemp
+    \global\let\LTXcmds at gtemp\ltx at empty
+  \else
+    \ifx\relax\LTXcmds at gtemp
+      \global\letLTXcmds at gtemp\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA\expandafter{\LTXcmds at gtemp#2}%
+    \xdef\LTXcmds at gtemp{\the\ltx at LocToksA}%
+  \endgroup
+  \let#1\LTXcmds at gtemp
+}
+\long\def\ltx at GlobalPrependToMacro#1#2{%
+  \ifx\ltx at undefined#1%
+    \let#1\ltx at empty
+  \else
+    \ifx\relax#1%
+      \let#1\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA{#2}%
+    \ltx at LocToksB\expandafter{#1}%
+    \xdef#1{\the\ltx at LocToksA\the\ltx at LocToksB}%
+  \endgroup
+}
+\long\def\ltx at LocalPrependToMacro#1#2{%
+  \global\let\LTXcmds at gtemp#1%
+  \ifx\ltx at undefined\LTXcmds at gtemp
+    \global\let\LTXcmds at gtemp\ltx at empty
+  \else
+    \ifx\relax\LTXcmds at gtemp
+      \global\letLTXcmds at gtemp\ltx at empty
+    \fi
+  \fi
+  \begingroup
+    \ltx at LocToksA{#2}%
+    \ltx at LocToksB\expandafter{\LTXcmds at gtemp}%
+    \xdef\LTXcmds at gtemp{\the\ltx at LocToksA\the\ltx at LocToksB}%
+  \endgroup
+  \let#1\LTXcmds at gtemp
+}
+\long\def\ltx at ifnextchar#1#2#3{%
+  \begingroup
+  \let\LTXcmds at CharToken= #1\relax
+  \ltx at LocToksA{\endgroup#2}%
+  \ltx at LocToksB{\endgroup#3}%
+  \futurelet\LTXcmds at LetToken\LTXcmds at ifnextchar
+}
+\def\LTXcmds at ifnextchar{%
+  \ifx\LTXcmds at LetToken\LTXcmds at CharToken
+    \the\expandafter\ltx at LocToksA
+  \else
+    \expandafter
+      \ifx\csname LTXcmds at LetToken\endcsname\LTXcmds at SpaceToken
+      \expandafter\expandafter\expandafter\LTXcmds@@ifnextchar
+    \else
+      \the\expandafter\expandafter\expandafter\ltx at LocToksB
+    \fi
+  \fi
+}
+\def\LTXcmds@@ifnextchar{%
+  \expandafter\futurelet
+  \expandafter\LTXcmds at LetToken
+  \expandafter\LTXcmds at ifnextchar
+  \romannumeral-`\.%
+}
+\ltx at firstofone{\let\LTXcmds at SpaceToken= } %
+\long\def\ltx at ifnextchar@nospace#1#2#3{%
+  \begingroup
+  \let\LTXcmds at CharToken= #1\relax
+  \ltx at LocToksA{\endgroup#2}%
+  \ltx at LocToksB{\endgroup#3}%
+  \futurelet\LTXcmds at LetToken\LTXcmds at ifnextchar@nospace
+}
+\def\LTXcmds at ifnextchar@nospace{%
+  \the
+  \ifx\LTXcmds at LetToken\LTXcmds at CharToken
+    \expandafter\ltx at LocToksA
+  \else
+    \expandafter\ltx at LocToksB
+  \fi
+}
+\ltx at IfUndefined{quitvmode}{%
+  \ltx at IfUndefined{leavevmode}{%
+    \ltx at IfUndefined{voidb at x}{%
+      \ltx at IfUndefined{newbox}{%
+        \def\ltx at leavevmode{%
+          \begingroup
+            \setbox\ltx at zero=\hbox{}%
+            \begingroup
+              \setbox\ltx at zero=\hbox{\box\ltx at zero}%
+            \endgroup
+            \unhbox\ltx at zero
+          \endgroup
+        }%
+      }{%
+        \csname newbox\endcsname\LTXcmds at VoidBox
+        \ifvoid\LTXcmds at VoidBox
+        \else
+          \setbox\LTXcmds at VoidBox=\hbox{}%
+          \begingroup
+            \setbox\LTXcmds at VoidBox=\hbox{\box\LTXcmds at VoidBox}%
+          \endgroup
+        \fi
+        \def\ltx at leavevmode{\unhbox\LTXcmds at VoidBox}%
+      }%
+    }{%
+      \def\ltx at leavevmode{\unhbox\voidb at x}%
+    }%
+  }{%
+    \let\ltx at leavevmode\leavevmode
+  }%
+}{%
+  \let\ltx at leavevmode\quitvmode
+}
+\def\ltx at mbox{%
+  \ltx at leavevmode
+  \hbox
+}
+\ltx at IfUndefined{numexpr}{%
+  \def\LTXcmds at num#1{%
+    \expandafter\ltx at firstofone\expandafter{%
+      \number#1%
+    }%
+  }%
+}{%
+  \def\LTXcmds at num#1{%
+    \expandafter\ltx at firstofone\expandafter{%
+      \the\numexpr#1%
+    }%
+  }%
+}
+\ltx at IfUndefined{detokenize}{%
+  \def\LTXcmds at temp#1{%
+    \long\def\ltx at ifempty##1{%
+      \romannumeral0%
+      \iffalse{\fi
+        \expandafter\ltx at gobble\expandafter{%
+          \expandafter{\string##1}%
+          \expandafter\ltx at gobble\string
+        }%
+        \expandafter\ltx at firstofthree\expandafter
+        {\iffalse}\fi
+        \expandafter#1\ltx at secondoftwo
+      }%
+      \expandafter#1\ltx at firstoftwo
+    }%
+    \long\def\ltx at ifblank##1{%
+      \romannumeral0%
+      \iffalse{\fi
+        \expandafter\expandafter\expandafter\ltx at gobble
+        \expandafter\expandafter\expandafter{%
+          \expandafter\expandafter\expandafter{%
+            \expandafter\string\ltx at gobble##1.%
+          }%
+          \expandafter\ltx at gobble\string
+        }%
+        \expandafter\ltx at firstofthree\expandafter
+        {\iffalse}\fi
+        \expandafter#1\ltx at secondoftwo
+      }%
+      \expandafter#1\ltx at firstoftwo
+    }%
+  }%
+  \LTXcmds at temp{ }%
+}{%
+  \long\def\ltx at ifempty#1{%
+    \romannumeral%
+    \csname
+      LTXcmds at ifempty%
+      \ifcat$\detokenize{#1}$%
+        @%
+      \fi
+    \endcsname
+  }%
+  \long\def\LTXcmds at ifempty@#1#2{0 #1}%
+  \long\def\LTXcmds at ifempty#1#2{0 #2}%
+  \long\def\ltx at ifblank#1{%
+    \romannumeral%
+    \csname
+      LTXcmds at ifempty%
+      \ifcat$\detokenize\expandafter{\ltx at gobble#1.}$%
+        @%
+      \fi
+    \endcsname
+  }%
+}
+\long\def\ltx at zapspace#1{%
+  \romannumeral
+  \LTXcmds at zapspace\ltx at zero#1 \@nil
+}
+\long\def\LTXcmds at zapspace#1 #2\@nil{%
+  \ltx at ifempty{#2}{%
+    #1%
+  }{%
+    \LTXcmds at zapspace#1#2\@nil
+  }%
+}
+\ltx at IfUndefined{lastnodetype}{%
+  \catcode`\$=9 %
+  \catcode`\&=14 %
+}{%
+  \catcode`\$=14 %
+  \catcode`\&=9 %
+}
+\def\ltx at IfBoxEmpty#1{%
+  \ifvoid#1\relax
+    \expandafter\ltx at secondoftwo
+  \else
+&   \begingroup
+&     \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+&       \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+&       \expandafter
+&     }%
+&   \expandafter\endgroup
+&   \ifnum\lastnodetype<\ltx at zero
+&     \expandafter\expandafter\expandafter\ltx at firstoftwo
+&   \else
+&     \expandafter\expandafter\expandafter\ltx at secondoftwo
+&   \fi
+$   \begingroup
+$     \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+$       \penalty\ltx at one
+$       \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$       \expandafter
+$     }%
+$     \ifnum\lastpenalty=\ltx at one
+$       \endgroup
+$       \begingroup
+$       \setbox\ltx at zero=\ifhbox#1\hbox\else\vbox\fi{%
+$         \penalty\ltx at two
+$         \ifhmode\unhcopy\else\unvcopy\fi#1\relax
+$         \expandafter
+$       }%
+$       \ifnum\lastpenalty=\ltx at two
+$         \def\next{\endgroup\expandafter\ltx at firstoftwo}%
+$       \else
+$         \def\next{\endgroup\expandafter\ltx at secondoftwo}%
+$       \fi
+$     \else
+$       \def\next{\endgroup\expandafter\ltx at secondoftwo}%
+$     \fi
+$   \next
+  \fi
+}
+\def\ltx at IfBoxVoidOrEmpty#1{%
+  \ifvoid#1\relax
+    \expandafter\ltx at thirdoffour
+  \fi
+  \ltx at IfBoxEmpty{#1}%
+}
+\LTXcmds at AtEnd%
+%% \section{Installation}
+\endinput
+%%
+%% End of file `ltxcmds.sty'.


Property changes on: trunk/Master/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Modified: trunk/Master/tlpkg/bin/tlpkg-ctan-check
===================================================================
--- trunk/Master/tlpkg/bin/tlpkg-ctan-check	2019-12-17 23:20:09 UTC (rev 53164)
+++ trunk/Master/tlpkg/bin/tlpkg-ctan-check	2019-12-17 23:21:23 UTC (rev 53165)
@@ -435,7 +435,7 @@
     lshort-slovenian lshort-spanish lshort-thai lshort-turkish lshort-ukr
     lshort-vietnamese
     lstaddons lstbayes lstfiracode lt3graph ltablex ltabptch ltb2bib
-    ltxdockit ltxfileinfo ltxguidex ltximg ltxindex
+    ltxcmds ltxdockit ltxfileinfo ltxguidex ltximg ltxindex
     ltxkeys ltxmisc ltxnew ltxtools
     lua-alt-getopt lua-check-hyphen lua-visual-debug
     lua2dox luabibentry luabidi luacode luacolor luahyphenrules

Modified: trunk/Master/tlpkg/tlpsrc/collection-latex.tlpsrc
===================================================================
--- trunk/Master/tlpkg/tlpsrc/collection-latex.tlpsrc	2019-12-17 23:20:09 UTC (rev 53164)
+++ trunk/Master/tlpkg/tlpsrc/collection-latex.tlpsrc	2019-12-17 23:21:23 UTC (rev 53165)
@@ -29,6 +29,7 @@
 depend latex-bin
 depend latex-fonts
 depend latexconfig
+depend ltxcmds
 depend ltxmisc
 depend mfnfss
 depend mptopdf

Added: trunk/Master/tlpkg/tlpsrc/ltxcmds.tlpsrc
===================================================================


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