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Tip revision: d4c0442683ffb0f84313b5715f1538c5ee99545d authored by Joseph Wright on 06 February 2020, 17:58:41 UTC
Set pre-release level
Set pre-release level
Tip revision: d4c0442
ltcounts.dtx
% \iffalse meta-comment
%
% Copyright (C) 1993-2020
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
% This file is part of the LaTeX base system.
% -------------------------------------------
%
% It 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.
% The latest version of this license is in
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008 or later.
%
% This file has the LPPL maintenance status "maintained".
%
% The list of all files belonging to the LaTeX base distribution is
% given in the file `manifest.txt'. See also `legal.txt' for additional
% information.
%
% The list of derived (unpacked) files belonging to the distribution
% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
%
% \fi
%
% \iffalse
%%% From File: ltcounts.dtx
%
%<*driver>
% \fi
\ProvidesFile{ltcounts.dtx}
[2018/04/22 v1.1l LaTeX Kernel (Counters)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltcounts.dtx}
\title{\filename}
\date{\filedate}
\author{%
Johannes Braams\and
David Carlisle\and
Alan Jeffrey\and
Leslie Lamport\and
Frank Mittelbach\and
Chris Rowley\and
Rainer Sch\"opf}
\begin{document}
\MaintainedByLaTeXTeam{latex}
\maketitle
\DocInput{\filename}
\end{document}
%</driver>
% \fi
%
%
% \changes{v1.0c}{1994/03/29}
% {Create file from parts of ltmiscen and ltherest.}
% \changes{v1.1a}{1994/05/19}{Extracted file from ltcntlen.}
% \changes{v1.1d}{1996/04/23}{Documentation improvements}
%
% \section{Counters and Lengths}
% Commands for defining and using counters. This file defines:
%
% \DescribeMacro{\newcounter}
% To define a new counter.
%
% \DescribeMacro{\setcounter}
% To set the value of counters.
%
% \DescribeMacro{\addtocounter}
% Increase the counter |#1| by the number |#2|.
%
% \DescribeMacro{\stepcounter}
% Increase a counter by one.
%
% \DescribeMacro{\refstepcounter}
% Increase a counter by one, also setting the value used by |\label|.
%
%
% \DescribeMacro{\value}
% For accessing the value of the counter as a \TeX\ number (as opposed
% to |\the|\meta{counter} which expands to the \emph{printed}
% representation of \meta{counter})
%
% \DescribeMacro\arabic
% |\arabic|\marg{counter}: 1, 2, 3, \ldots
%
% \DescribeMacro\roman
% |\roman|\marg{counter}: i, ii, iii, \ldots
%
% \DescribeMacro\Roman
% |\Roman|\marg{counter}: I, II, III, \ldots
%
% \DescribeMacro\alph
% |\alph|\marg{counter}: a, b, c, \ldots
%
% \DescribeMacro\Alph
% |\Alph|\marg{counter}: A, B, C, \ldots
%
% \DescribeMacro\fnsymbol
% |\fnsymbol|\marg{counter}: $*$, $\dagger$, $\ddagger$, \ldots
%
%
% \DescribeMacro\counterwithin
% |\counterwithin|\marg{counter}\marg{within-counter}:
% Resets \meta{counter} whenever
% \meta{within-counter} is stepped. Also
% redefines |\the|\meta{counter} command to produce
% |\the|\meta{within-counter}|.\arabic|\marg{counter}.
% Star form omits redefining the print representation.
%
% \DescribeMacro\counterwithout
% |\counterwithout|\marg{counter}\marg{within-counter}:
% Removes \meta{counter} from the reset list of \meta{within-counter}.
% Also
% redefines |\the|\meta{counter} command to produce
% |\arabic|\marg{counter}.
% Star form omits redefining the print representation.
%
% \StopEventually{}
%
% \begin{macrocode}
%<*2ekernel>
% \end{macrocode}
%
% \subsection{Environment Counter Macros}
%
% An environment foo has an associated counter defined by the
% following control sequences:
%
% \begin{tabular}{lp{.75\textwidth}}
% |\c@foo| & Contains the counter's numerical value.
% It is defined by |\newcount\foocounter|.\\
% |\thefoo| & Macro that expands to the printed value of |\foocounter|.
% For example, if sections are numbered within chapters,
% and section headings look like
%
% Section II-3. The Nature of Counters
%
% then |\thesection| might be defined by:\newline
% |\def\thesection|\newline\hspace*{2em}
% |{\@Roman{\c@chapter}-\@arabic{\c@section}}|\\
%
% |\p@foo| & Macro that expands to a printed `reference prefix' of
% counter foo. Any |\ref| to a value created by counter
% foo will produce the expansion of |\p@foo\thefoo| when
% the |\label| command is executed. See file \texttt{ltxref.dtx}
% for an extension of this mechanism.\\
% |\cl@foo| & List of counters to be reset when foo stepped.
% Has format
% |\@elt{countera}\@elt{counterb}\@elt{counterc}|.
% \end{tabular}
%
% \textbf{NOTE:}\\
% |\thefoo| and |\p@foo| \emph{must} be defined in such a way that
% |\edef\bar{\thefoo}| or |\edef\bar{\p@foo}|
% defines |\bar| so that it will evaluate to the counter value at the
% time of the |\edef|, even after |\foocounter| and any other counters
% have been changed. This will happen if you use the standard commands
% |\@arabic|, |\@Roman|, etc.
%
%
% The following commands are used to define and modify counters.
%
% |\refstepcounter|\marg{foo}\\
% Same as |\stepcounter|, but it also defines
% |\@currentreference| so that a subsequent
% |\label|\marg{bar} command causes |\ref|\marg{bar} to
% generate the current value of counter \meta{foo}.
%
% |\@definecounter|\marg{foo}\\
% Initializes counter \marg{foo} (with empty reset list), defines
% |\p@foo| and |\thefoo| to be null. Also adds \meta{foo}
% to |\cl@@ckpt| --
% the reset list of a dummy counter |@ckpt| used for taking
% checkpoints for the |\include| system.
%
% |\@addtoreset|\marg{foo}\marg{bar} :
% Adds counter \meta{foo} to the list of counters
% |\cl@bar| to be reset when counter \meta{bar} is stepped.
%
% |\@removefromreset|\marg{foo}\marg{bar} :
% Removes counter \meta{foo} to the list of counters
% |\cl@bar| to be reset when counter \meta{bar} is stepped.
%
%
% \begin{macro}{\setcounter}
% \changes{v1.0d}{1994/04/09}
% {\cs{@nocnterr} now has counter name argument}
% \changes{v1.0e}{1994/04/17}
% {Use \cs{@nocounterr} instead of \cs{@nocnterr}}
% |\setcounter|\marg{foo}\marg{val} :
% Globally sets |\foocounter| equal to \meta{val}.
% \begin{macrocode}
\def\setcounter#1#2{%
\@ifundefined{c@#1}%
{\@nocounterr{#1}}%
{\global\csname c@#1\endcsname#2\relax}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\addtocounter}
% \changes{v1.0d}{1994/04/09}
% {\cs{@nocnterr} now has counter name argument}
% \changes{v1.0e}{1994/04/17}
% {Use \cs{@nocounterr} instead of \cs{@nocnterr}}
% |\addtocounter|\marg{foo}\marg{val}
% Globally increments |\foocounter| by \meta{val}.
% \begin{macrocode}
\def\addtocounter#1#2{%
\@ifundefined{c@#1}%
{\@nocounterr{#1}}%
{\global\advance\csname c@#1\endcsname #2\relax}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\newcounter}
% |\newcounter|\marg{newctr}\oarg{oldctr}
% Defines \meta{newctr} to be a counter, which is reset when counter
% \meta{oldctr} is stepped. If \meta{newctr} already defined
% produces
% `|c@newctr already defined|' error.
% \begin{macrocode}
\def\newcounter#1{%
\expandafter\@ifdefinable \csname c@#1\endcsname
{\@definecounter{#1}}%
\@ifnextchar[{\@newctr{#1}}{}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\value}
% |\value|\marg{ctr}
% produces the value of counter \meta{ctr}, for use with
% a |\setcounter| or |\addtocounter| command.
% \begin{macrocode}
\def\value#1{\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@newctr}
% \changes{v1.0d}{1994/04/09}
% {\cs{@nocnterr} now has counter name argument}
% \changes{v1.0e}{1994/04/17}
% {Use \cs{@nocounterr} instead of \cs{@nocnterr}}
% \begin{macrocode}
\def\@newctr#1[#2]{%
\@ifundefined{c@#2}{\@nocounterr{#2}}{\@addtoreset{#1}{#2}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\stepcounter}
% \changes{LaTeX209}{1992/11/23}{Replaced \{\} in \cs{stepcounter} by
% \cs{begingroup} \cs{endgroup} to avoid adding an empty ord in
% math mode}
% \changes{v1.0d}{1994/04/09}
% {Use \cs{addtocounter} to have name checked}
% |\stepcounter|{foo}
% Globally increments counter |\c@FOO|
% and resets all subsidiary counters.
% \begin{macrocode}
\def\stepcounter#1{%
\addtocounter{#1}\@ne
\begingroup
\let\@elt\@stpelt
\csname cl@#1\endcsname
\endgroup}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@stpelt}
% \changes{v1.1h}{2015/01/10}{Reset all within counters in one go (latexrelease)}
%
% Rather than resetting the ``within'' counter to zero we set it to
% $-1$ and then run |\stepcounter| that moves it to $0$ and also
% initiates resetting the next level down.
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}{\@stpelt}
%<latexrelease> {Reset nested counters}%
%<*2ekernel|latexrelease>
\def\@stpelt#1{\global\csname c@#1\endcsname \m@ne\stepcounter{#1}}%
%<latexrelease>\EndIncludeInRelease
%</2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{0000/00/00}{\@stpelt}
%<latexrelease> {Reset nested counters}%%
%<latexrelease>\def\@stpelt#1{\global\csname c@#1\endcsname \z@}%
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\cl@@ckpt}
% \begin{macrocode}
\def\cl@@ckpt{\@elt{page}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@definecounter}
% \changes{v1.1b}{1995/05/20}{Streamlined code}
% \changes{v1.1c}{1995/05/20}{And do it right}
%
% \begin{macrocode}
\def\@definecounter#1{\expandafter\newcount\csname c@#1\endcsname
\setcounter{#1}\z@
\global\expandafter\let\csname cl@#1\endcsname\@empty
\@addtoreset{#1}{@ckpt}%
\global\expandafter\let\csname p@#1\endcsname\@empty
\expandafter
\gdef\csname the#1\expandafter\endcsname\expandafter
{\expandafter\@arabic\csname c@#1\endcsname}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@addtoreset}
% \begin{macrocode}
\def\@addtoreset#1#2{\expandafter\@cons\csname cl@#2\endcsname {{#1}}}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macrocode}
%</2ekernel>
% \end{macrocode}
%
%
% \begin{macro}{\@removefromreset}
% \changes{v1.1k}{2018/03/08}{Interface added}
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{2018-04-01}
%<latexrelease> {\@removefromreset}{Add interfaces}%
%<*2ekernel|latexrelease>
% \end{macrocode}
%
% \begin{macrocode}
\def\@removefromreset#1#2{%
% \end{macrocode}
% Even through this is internal and the programmer should know what
% he/she is doing we test here if counter |#2| is defined. If not,
% the execution would run into a tight loop.
% \begin{macrocode}
\@ifundefined{c@#2}\relax
{\begingroup
\expandafter\let\csname c@#1\endcsname\@removefromreset
\def\@elt##1{%
\expandafter\ifx\csname c@##1\endcsname\@removefromreset
\else
\noexpand\@elt{##1}%
\fi}%
\expandafter\xdef\csname cl@#2\endcsname
{\csname cl@#2\endcsname}%
\endgroup}}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\@ifbothcounters}
% \changes{v1.1k}{2018/03/08}{Interface added}
% Test if arg |#1| and |#2| are counters and if so execute |#3|.
% \begin{macrocode}
\def\@ifbothcounters#1#2#3{%
\@ifundefined{c@#1}{\@nocounterr{#1}}%
{% else counter is defined
\@ifundefined{c@#2}{\@nocounterr{#2}}%
{% else both counter and within are defined
#3}}}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\counterwithout}
%
% \changes{v1.1k}{2018/03/08}{Interface added}
% \begin{macrocode}
\def\counterwithout {\@ifstar\counterwithout@s\counterwithout@x}
% \end{macrocode}
%
% \begin{macrocode}
\def\counterwithout@s#1#2{%
\@ifbothcounters{#1}{#2}{\@removefromreset{#1}{#2}}}
% \end{macrocode}
%
% \begin{macrocode}
\def\counterwithout@x#1#2{%
\@ifbothcounters{#1}{#2}%
{\@removefromreset{#1}{#2}%
\expandafter
\gdef\csname the#1\expandafter\endcsname\expandafter
{\expandafter
\@arabic\csname c@#1\endcsname}}}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\counterwithin}
%
% \changes{v1.1k}{2018/03/08}{Interface added}
% \begin{macrocode}
\def\counterwithin{\@ifstar\counterwithin@s\counterwithin@x}
% \end{macrocode}
%
% \begin{macrocode}
\def\counterwithin@s#1#2{%
\@ifbothcounters{#1}{#2}{\@addtoreset{#1}{#2}}}
% \end{macrocode}
%
% \changes{v1.1l}{2018/04/11}{Correct default (issue/38)}
% \begin{macrocode}
\def\counterwithin@x#1#2{%
\@ifbothcounters{#1}{#2}%
{\@addtoreset{#1}{#2}%
\expandafter
\gdef\csname the#1\expandafter\endcsname\expandafter
{\csname the#2\expandafter\endcsname\expandafter
.\expandafter
\@arabic\csname c@#1\endcsname}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000-00-00}
%<latexrelease> {\@removefromreset}{Add interfaces}%
%<latexrelease>\let \@removefromreset \undefined
%<latexrelease>\let \@ifbothcounters \undefined
%<latexrelease>\let \counterwithout \undefined
%<latexrelease>\let \counterwithout@s \undefined
%<latexrelease>\let \counterwithout@x \undefined
%<latexrelease>\let \counterwithin \undefined
%<latexrelease>\let \counterwithin@s \undefined
%<latexrelease>\let \counterwithin@x \undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
%
%
% Numbering commands for definitions of |\theCOUNTER| and |\list|
% arguments.
%
% All commands can now be used in text and math mode.
%
% \begin{macro}{\arabic}
% Representation of\meta{counter} as arabic numerals.
% Changed 29 Apr 86 to make it print the obvious thing
% it COUNTER not positive.
% \begin{macrocode}
\def\arabic#1{\expandafter\@arabic\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\roman}
% Representation of \meta{counter} as lower-case
% Roman numerals.
% \begin{macrocode}
\def\roman#1{\expandafter\@roman\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\Roman}
% Representation of \meta{counter} as upper-case
% Roman numerals.
% \begin{macrocode}
\def\Roman#1{\expandafter\@Roman\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\alph}
% Representation of \meta{counter} as a lower-case
% letter: 1 = a, 2 = b, etc.
% \begin{macrocode}
\def\alph#1{\expandafter\@alph\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\Alph}
% Representation of \meta{counter} as an upper-case
% letter: 1 = A, 2 = B, etc.
% \begin{macrocode}
\def\Alph#1{\expandafter\@Alph\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\fnsymbol}
% \changes{v1.1b}{1995/05/20}{Streamlined code}
% \changes{v1.1e}{1997/03/21}
% {Use \cs{mathsection} and \cs{mathparagraph}. latex/2445}
%
% Representation of \meta{COUNTER} as a footnote
% symbol: 1 = $*$, 2 = $\dagger$, etc.
% \begin{macrocode}
\def\fnsymbol#1{\expandafter\@fnsymbol\csname c@#1\endcsname}
% \end{macrocode}
% \end{macro}
%
% \changes{v1.0f}{1994/05/13}{Removed \cs{@ialph}}
% \changes{v1.0f}{1994/05/13}{Removed \cs{@Ialph}}
%
% \begin{macro}{\@arabic}
% |\@arabic\FOOcounter|
% Representation of |\FOOcounter| as arabic numerals.
% \begin{macrocode}
\def\@arabic#1{\number #1} %% changed 29 Apr 86
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@roman}
% |\@roman\FOOcounter|
% Representation of |\FOOcounter| as lower-case
% Roman numerals.
% \begin{macrocode}
\def\@roman#1{\romannumeral #1}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@Roman}
% |\@Roman\FOOcounter|
% Representation of |\FOOcounter| as upper-case
% Roman numerals.
% \changes{v1.1f}{1997/10/06}{Change \cs{@Roman} to be fully
% expandable, so that the result is written properly to files.}
% \begin{macrocode}
\def\@Roman#1{\expandafter\@slowromancap\romannumeral #1@}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@slowromancap}
% \changes{v1.1f}{1997/10/06}{Macro added.}
% Fully expandable macro to change a roman number to uppercase.
% \begin{macrocode}
\def\@slowromancap#1{\ifx @#1% then terminate
\else
\if i#1I\else\if v#1V\else\if x#1X\else\if l#1L\else\if
c#1C\else\if d#1D\else \if m#1M\else#1\fi\fi\fi\fi\fi\fi\fi
\expandafter\@slowromancap
\fi
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@alph}
% |\@alph\FOOcounter|
% Representation of |\FOOcounter| as a lower-case
% letter: 1 = a, 2 = b, etc.
% \begin{macrocode}
\def\@alph#1{%
\ifcase#1\or a\or b\or c\or d\or e\or f\or g\or h\or i\or j\or
k\or l\or m\or n\or o\or p\or q\or r\or s\or t\or u\or v\or w\or x\or
y\or z\else\@ctrerr\fi}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@Alph}
% |\@Alph\FOOcounter|
% Representation of |\FOOcounter| as an upper-case
% letter: 1 = A, 2 = B, etc.
% \begin{macrocode}
\def\@Alph#1{%
\ifcase#1\or A\or B\or C\or D\or E\or F\or G\or H\or I\or J\or
K\or L\or M\or N\or O\or P\or Q\or R\or S\or T\or U\or V\or W\or X\or
Y\or Z\else\@ctrerr\fi}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@fnsymbol}
% \changes{v1.1b}{1995/05/20}{Allowing both text and math}
% Typesetting old fashioned footnote symbols.
% This can be done both in text or math mode now.
%
% \changes{v1.1h}{2015/01/10}{Unse \cs{TextOrMath} (latexrelease)}
% This macro is another example of an ever recurring problem in
% \TeX: Determining if something is text-mode or math-mode. It is
% imperative for the decision between text and math to be delayed
% until the actual typesetting is done as the code in question may
% go through an |\edef| or |\write| where an |\ifmmode| test would
% be executed prematurely. Hence in the implementation below,
% |\@fnsymbol| is not robust in itself but the parts doing the
% actual typesetting are.
%
% In the case of |\@fnsymbol| we make use of the robust command
% |\TextOrMath| which takes two arguments and typesets the first if
% in text-mode and the second if in math-mode. Note that in order
% for this command to make the correct decision, it must insert a
% |\relax| token if run under regular \TeX, which ruins any kerning
% between the preceding characters and whatever awaits
% typesetting. If you use e\TeX\ as engine for \LaTeX\ (as
% recommended) this unfortunate side effect is not present.
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}{\@fnsymbol}{Use \TexOrMath}%
%<*2ekernel|latexrelease>
\def\@fnsymbol#1{%
\ifcase#1\or \TextOrMath\textasteriskcentered *\or
\TextOrMath \textdagger \dagger\or
\TextOrMath \textdaggerdbl \ddagger \or
\TextOrMath \textsection \mathsection\or
\TextOrMath \textparagraph \mathparagraph\or
\TextOrMath \textbardbl \|\or
\TextOrMath {\textasteriskcentered\textasteriskcentered}{**}\or
\TextOrMath {\textdagger\textdagger}{\dagger\dagger}\or
\TextOrMath {\textdaggerdbl\textdaggerdbl}{\ddagger\ddagger}\else
\@ctrerr \fi
}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}{\@fnsymbol}{Use \TexOrMath}%
%<latexrelease>\def\@fnsymbol#1{\ensuremath{%
%<latexrelease> \ifcase#1\or *\or \dagger\or \ddagger\or \mathsection\or
%<latexrelease> \mathparagraph\or \|\or **\or \dagger\dagger
%<latexrelease> \or \ddagger\ddagger \else\@ctrerr\fi}}%
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\TextOrMath}
% \changes{v1.1h}{2015/01/11}{Add command to solve robustness
% issues (pr/3752) (latexrelease)}
% \changes{v1.1j}{2016/10/19}{Test directly for \cs{protected}}
% When using regular \TeX, we make this command robust so that it
% always selects the correct branch in an |\ifmmode| switch with
% the usual disadvantage of ruining kerning. For the application we
% use it for here that shouldn't matter. The alternative would be
% to mimic |\IeC| from \textsf{inputenc} but then it wil have the
% disadvantage of choosing the wrong branch if appearing at the
% beginning of an alignment cell. However, users of e\TeX\ will be
% pleasantly surprised to get the best of both worlds and no bad
% side effects.
%
% First some code for checking if we are running e\TeX\ but making
% sure not to permanently turn |\protected| into |\relax|.
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}{\TextOrMath}{\TextOrMath}%
%<*2ekernel|latexrelease>
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname protected\endcsname\relax
% \end{macrocode}
% In case of ordinary \TeX\ we define |\TextOrMath| as a robust
% command but make sure it always grabs its arguments. If we didn't do
% this it might very well gobble spaces in the input stream.
% \begin{macrocode}
\DeclareRobustCommand\TextOrMath{%
\ifmmode \expandafter\@secondoftwo
\else \expandafter\@firstoftwo \fi}
\protected@edef\TextOrMath#1#2{\TextOrMath{#1}{#2}}
\else
% \end{macrocode}
% For e\TeX\ the situation is similar. The robust macro is a hidden
% one so that we again avoid problems of gobbling spaces in the input.
% \begin{macrocode}
\protected\expandafter\def\csname TextOrMath\space\endcsname{%
\ifmmode \expandafter\@secondoftwo
\else \expandafter\@firstoftwo \fi}
\edef\TextOrMath#1#2{%
\expandafter\noexpand\csname TextOrMath\space\endcsname
{#1}{#2}}
\fi
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}{\TextOrMath}{\TextOrMath}%
%<latexrelease>\let\TextOrMath\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</2ekernel>
% \end{macrocode}
%
% \Finale
%
