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|
% \iffalse meta-comment
%
% Copyright (C) 2005-8 by Ulrich M. Schwarz
%
% This file may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, version 1.3a.
% The license can be obtained from
% http://www.latex-project.org/lppl/lppl-1-3a.txt
%
% \fi
%
%\iffalse
%<*code>
%\fi
% Two macros are provided: |\setuniqmark| takes a single parameter,
% the name, which should be a string of letters. |\ifuniqmark| takes
% three parameters: a name, a true-part and a false-part. The true
% part is executed if and only if there was exactly one call to
% |\setuniqmark| with the given name during the previous \LaTeX\ run.
%
% Example application: legal documents are often very strongly numbered.
% However, if a section has only a single paragraph, this paragraph is
% not numbered separately, this only occurs from two paragraphs onwards.
%
% It's also possible to not-number the single theorem in your paper, but
% fall back to numbering when you add another one.
%
% \StopEventually{}
%
% \begin{macrocode}
\DeclareOption{unq}{%
\newwrite\uniq@channel
\InputIfFileExists{\jobname.unq}{}{}%
\immediate\openout\uniq@channel=\jobname.unq
\AtEndDocument{%
\immediate\closeout\uniq@channel%
}
}
\DeclareOption{aux}{%
\let\uniq@channel\@auxout
}
% \end{macrocode}
%
%
% \iffalse $Id: unique.dtx,v 1.4 2010/04/25 19:37:46 ulmi Exp $\fi
% \begin{macro}{\setuniqmark}
% Call this with a name to set the corresponding uniqmark. The name must
% be suitable for |\csname|-constructs, i.e. fully expansible to a
% string of characters. If you use some counter values to generate this,
% it might be a good idea to try and use hyperref's |\theH...| macros,
% which have similar restrictions. You can check whether a particular
% |\setuniqmark| was called more than once during \emph{the last run}
% with |\ifuniq|.
% \begin{macrocode}
\newcommand\setuniqmark[1]{%
\expandafter\ifx\csname uniq@now@#1\endcsname\relax
\global\@namedef{uniq@now@#1}{\uniq@ONE}%
\else
\expandafter\ifx\csname uniq@now@#1\endcsname\uniq@MANY\else
\immediate\write\uniq@channel{%
\string\uniq@setmany{#1}%
}%
\ifuniq{#1}{%
\uniq@warnnotunique{#1}%
}{}%
\fi
\global\@namedef{uniq@now@#1}{\uniq@MANY}%
\fi
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ifuniq}
% Companion to |\setuniqmark|: if the uniqmark given in the first
% argument was called more than once, execute the second argument,
% otherwise execute the first argument. Note than no call to
% |\setuniqmark| for a particular uniqmark at all means that this
% uniqmark is unique.
%
% This is a lazy version: we could always say false if we already had two calls
% to setuniqmark this run, but we have to rerun for any ifuniq prior
% to the first setuniqmark anyway, so why bother?
% \begin{macrocode}
\newcommand\ifuniq[1]{%
\expandafter\ifx\csname uniq@last@#1\endcsname\uniq@MANY
\expandafter \@secondoftwo
\else
\expandafter\@firstoftwo
\fi
}
% \end{macrocode}
% \end{macro}
%
% Two quarks to signal if we have seen an uniqmark more than once.
% \begin{macrocode}
\def\uniq@ONE{\uniq@ONE}
\def\uniq@MANY{\uniq@MANY}
% \end{macrocode}
% Flag: suggest a rerun?
% \begin{macrocode}
\newif\if@uniq@rerun
% \end{macrocode}
%
% Helper macro: a call to this is written to the .aux file when we see
% an uniqmark for the second time. This sets the right information for
% the next run. It also checks on subsequent runs if the number of
% uniqmarks drops to less than two, so that we'll need a rerun.
% \begin{macrocode}
\def\uniq@setmany#1{%
\global\@namedef{uniq@last@#1}{\uniq@MANY}%
\AtEndDocument{%
\uniq@warnifunique{#1}%
}%
}
% \end{macrocode}
%
% Warning if something is unique now. This always warns if the
% setting for this run is not ``many'', because it was generated
% by a setmany from the last run.
% \begin{macrocode}
\def\uniq@warnifunique#1{%
\expandafter\ifx\csname uniq@now@#1\endcsname\uniq@MANY\else
\PackageWarningNoLine{uniq}{%
`#1' is unique now.\MessageBreak
Rerun LaTeX to pick up the change%
}%
\@uniq@reruntrue
\fi
}
% \end{macrocode}
%
% Warning if we have a second uniqmark this run around. Since this is
% checked immediately, we could give the line of the second
% occurence, but we do not do so for symmetry.
% \begin{macrocode}
\def\uniq@warnnotunique#1{%
\PackageWarningNoLine{uniq}{%
`#1' is not unique anymore.\MessageBreak
Rerun LaTeX to pick up the change%
}%
\@uniq@reruntrue
}
% \end{macrocode}
%
% Maybe advise a rerun (duh!). This is executed at the end of the
% second reading of the aux-file. If you manage to set uniqmarks
% after that (though I cannot imagine why), you might need reruns
% without being warned, so don't to that.
% \begin{macrocode}
\def\uniq@maybesuggestrerun{%
\if@uniq@rerun
\PackageWarningNoLine{uniq}{%
Uniquenesses have changed. \MessageBreak
Rerun LaTeX to pick up the change%
}%
\fi
}
% \end{macrocode}
%
% Make sure the check for rerun is pretty late in processing, so it
% can catch all of the uniqmarks (hopefully).
% \begin{macrocode}
\AtEndDocument{%
\immediate\write\@auxout{\string\uniq@maybesuggestrerun}%
}
\ExecuteOptions{aux}
\ProcessOptions\relax
% \end{macrocode}
%\iffalse
%</code>
%\fi
|
