texlive[56421] Master/texmf-dist/source: ltxcmds (24sep20)
commits+karl at tug.org
commits+karl at tug.org
Thu Sep 24 22:43:57 CEST 2020
Revision: 56421
http://tug.org/svn/texlive?view=revision&revision=56421
Author: karl
Date: 2020-09-24 22:43:57 +0200 (Thu, 24 Sep 2020)
Log Message:
-----------
ltxcmds (24sep20)
Added Paths:
-----------
trunk/Master/texmf-dist/source/generic/ltxcmds/
trunk/Master/texmf-dist/source/generic/ltxcmds/ltxcmds.dtx
Removed Paths:
-------------
trunk/Master/texmf-dist/source/latex/ltxcmds/
Added: trunk/Master/texmf-dist/source/generic/ltxcmds/ltxcmds.dtx
===================================================================
--- trunk/Master/texmf-dist/source/generic/ltxcmds/ltxcmds.dtx (rev 0)
+++ trunk/Master/texmf-dist/source/generic/ltxcmds/ltxcmds.dtx 2020-09-24 20:43:57 UTC (rev 56421)
@@ -0,0 +1,2356 @@
+% \iffalse meta-comment
+%
+% File: ltxcmds.dtx
+% Version: 2020-05-10 v1.25
+% Info: LaTeX kernel commands for general use
+%
+% Copyright (C)
+% 2009-2011 Heiko Oberdiek
+% 2016-2020 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 2020-05-10 v1.25 LaTeX kernel commands for general use (HO)}
+\Msg{************************************************************************}
+
+\keepsilent
+\askforoverwritefalse
+
+\let\MetaPrefix\relax
+\preamble
+
+This is a generated file.
+
+Project: ltxcmds
+Version: 2020-05-10 v1.25
+
+Copyright (C)
+ 2009-2011 Heiko Oberdiek
+ 2016-2020 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}%
+ [2020-05-10 v1.25 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{2020-05-10 v1.25}
+% \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 2020-05-10 v1.25:
+% \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}%
+ [2020-05-10 v1.25 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}
+% changed 2020-05-10 to adapt to dates with dashes (ISO)
+% The core of the commands are copies from the latex commands.
+% \begin{macro}{\ltx at ifl@ter}
+% \begin{macro}{\ltx at parse@version@}
+% \begin{macrocode}
+\def\ltx at ifl@ter#1#2{%
+ \expandafter\ltx at ifl@t at r
+ \csname ver@#2.#1\endcsname}
+\def\ltx at ifl@t at r#1#2{%
+ \ifnum\expandafter\ltx at parse@version@#1//00\@nil<%
+ \expandafter\ltx at parse@version@#2//00\@nil
+ \expandafter\@secondoftwo
+ \else
+ \expandafter\@firstoftwo
+ \fi}
+\def\ltx at parse@version@#1{\ltx at parse@version0#1}
+\def\ltx at parse@version#1/#2/#3#4#5\@nil{%
+\ltx at parse@version at dash#1-#2-#3#4\@nil
+}
+\def\ltx at parse@version at dash#1-#2-#3#4#5\@nil{%
+ \if\relax#2\relax\else#1\fi#2#3#4 }
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \begin{macro}{\ltx at iffilelater}
+% \begin{macrocode}
+\def\ltx at iffilelater#1{\expandafter\ltx at ifl@t at r\csname ver@#1\endcsname}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx at ifclasslater}
+% \begin{macrocode}
+\def\ltx at ifclasslater{\ltx at ifl@ter\ltx at clsextension}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ltx at ifpackagelater}
+% \begin{macrocode}
+\def\ltx at ifpackagelater{\ltx at ifl@ter\ltx at pkgextension}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \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}
+%
+%
+% \subsection{Package installation}
+% The package is at best installed with the package manager of the \TeX~system.
+% Manual installation is possible too:
+% \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}
+% \begin{Version}{2020-05-10 v1.25}
+% \item Changed the definitions of \cs{ltx at iffilelater}, \cs{ltx at ifpackagelater}
+% and \cs{ltx at ifclasslater} to support dates in ISO format in same way as the
+% LaTeX kernel does it since 2017. The commands now use the same test as the
+% LaTeX kernel. \cs{pdfmatch} is no longer used with pdftex, and the tests for dates before
+% 1994 have been removed
+% \end{Version}
+% \end{History}
+%
+% \PrintIndex
+%
+% \Finale
+\endinput
Property changes on: trunk/Master/texmf-dist/source/generic/ltxcmds/ltxcmds.dtx
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
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