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% \iffalse meta-comment
%
% Copyright (C) 2005-2014 by Ulrich M. Schwarz
% Copyright (C) 2019 by Frank Mittelbach
% Copyright (C) 2020- by Yukai Chou
%
% This file may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, version 1.3c.
% The license can be obtained from
% http://www.latex-project.org/lppl/lppl-1-3c.txt
%
%<*code>
% \fi
% |\@counteralias{#1}{#2}| makes |#1| a counter that uses |#2|'s count register.
% This is useful for things like \pkg{hyperref}'s |\autoref|, which otherwise
% can't distinguish theorems and definitions if they share a counter.
%
% For detailed information, see Die TeXnische Kom\"odie 3/2006.
% \StopEventually{}
% \begin{macro}{\@addtoreset}
% add |\@elt{#1}| to |\cl@#2|.
% This differs from the kernel implementation insofar as we trail the
% cl lists until we find one that is empty or starts with |\@elt|.
% \begin{macrocode}
\def\aliasctr@f@llow#1#2\@nil#3{%
\ifx#1\@elt
\noexpand #3%
\else
\expandafter\aliasctr@f@llow#1\@elt\@nil{#1}%
\fi
}
% \end{macrocode}
%
% \begin{macrocode}
\newcommand\aliasctr@follow[1]{%
\expandafter\aliasctr@f@llow
% \end{macrocode}
% Don't be confused: the third parameter is ignored here, we always
% have recursion here since the \emph{token} |\cl@#1| is (hopefully) not |\@elt|.
% \begin{macrocode}
\csname cl@#1\endcsname\@elt\@nil{\csname cl@#1\endcsname}%
}
% \end{macrocode}
%
% \begin{macrocode}
\renewcommand*\@addtoreset[2]{\bgroup
\edef\aliasctr@@truelist{\aliasctr@follow{#2}}%
\let\@elt\relax
\expandafter\@cons\aliasctr@@truelist{{#1}}%
\egroup}
% \end{macrocode}
%
% This code has been adapted from David Carlisle's \pkg{remreset}. We
% load that here only to prevent it from being loaded again.
% \begin{macrocode}
% FMi 2019-07-31 \@removereset is in the kernel these days
\@ifundefined{@removefromreset}{\RequirePackage{remreset}}{}
\renewcommand*\@removefromreset[2]{\bgroup
\edef\aliasctr@@truelist{\aliasctr@follow{#2}}%
\expandafter\let\csname c@#1\endcsname\@removefromreset
\def\@elt##1{%
\expandafter\ifx\csname c@##1\endcsname\@removefromreset
\else
\noexpand\@elt{##1}%
\fi}%
\expandafter\xdef\aliasctr@@truelist{%
\aliasctr@@truelist}
\egroup}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@counteralias}
% make |#1| a counter that uses counter |#2|'s count register.
% \begin{macrocode}
\newcommand\@counteralias[2]{{%
\def\@@gletover##1##2{%
\expandafter\global
\expandafter\let\csname ##1\expandafter\endcsname
\csname ##2\endcsname
}%
\@ifundefined{c@#2}{\@nocounterr{#2}}{%
\expandafter\@ifdefinable\csname c@#1\endcsname{%
% \end{macrocode}
% Four values make a counter foo:
% \begin{itemize}
% \item the count register accessed through |\c@foo|,
% \item the output macro |\thefoo|,
% \item the prefix macro |\p@foo|,
% \item the reset list |\cl@foo|.
% \end{itemize}
% \pkg{hyperref} adds |\theHfoo| in particular.
% \begin{macrocode}
\@@gletover{c@#1}{c@#2}%
\@@gletover{the#1}{the#2}%
% \end{macrocode}
% I don't see |\@counteralias| being called hundreds of times,
% let's just unconditionally create |\theHctr|-macros for \pkg{hyperref}.
% \begin{macrocode}
\@@gletover{theH#1}{theH#2}%
% \end{macrocode}
% YkC: Compatibility with \pkg{cleveref}, copied from \pkg{cleveref}'s
% support for \pkg{aliascnt}.
% Here |\cref@resetby| requires its first argument to be the actual counter
% name, not a macro storing the name. Thanks to Willie Wong.
% \begin{macrocode}
\@ifpackageloaded{cleveref}{%
\edef\aliasctr@temp{%
\noexpand\cref@resetby{#2}{\noexpand\cref@result}}%
\aliasctr@temp
\ifx\cref@result\relax\else%
\cref@addtoreset{#1}{\cref@result}%
\fi
}{}%
\@@gletover{p@#1}{p@#2}%
\expandafter\global
\expandafter\def\csname cl@#1\expandafter\endcsname
\expandafter{\csname cl@#2\endcsname}%
% \end{macrocode}
% It is not necessary to save the value again: since we share a
% count register, we will pick up the restored value of the
% original counter.
% \begin{macrocode}
%\@addtoreset{#1}{@ckpt}%
}%
}%
}}
% \end{macrocode}
% \end{macro}
%\iffalse
%</code>
%\fi
|
