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% exa.sty
% modified after example.sty by J.Schrod, xitijsch@ddathd21.bitnet
% Guido Gonzato, guido.gonzato@univr.it
\chardef\escape=0
\chardef\open=1
\chardef\close=2
\chardef\letter=11
\chardef\other=12
%\chardef\active=13 % is defined in Plain already
\chardef\uscode=\catcode`\_ % top level macro file!
\catcode`\_=\letter
\oddsidemargin=0pt
\evensidemargin=\oddsidemargin
\newwrite\example_file
\def\example_name{\jobname.tmp } % <-- space!
\newdimen\ExampleWidth
\ExampleWidth=\textwidth
\advance\ExampleWidth by \marginparwidth % stick into margins
\advance\ExampleWidth by \columnsep % between columns
\divide\ExampleWidth by 2
\def\ExampleSet{%
\begin{boxedminipage}[c]{0.5\textwidth}%
\hrule height\z@
\def\markboth##1##2{}%
\def\markright##1{}%
\def\addcontentsline##1##2##3{}%
\input \example_name
\par
\hrule height\z@
\end{boxedminipage}%
}
\begingroup
\catcode`\^^I=\active
\gdef\@vobeytabs{\catcode`\^^I\active \let^^I\@xobeytab}
\global\let^^I=\@xobeytab% % for \write's
\endgroup
\def\@xobeytab{\space\space\space\space\space\space\space\space}
\def\ExampleVerb{%
\begin{minipage}[c]{0.5\textwidth}%
\hrule height\z@
\begingroup
\small
\parindent\z@
\rightskip\@flushglue
\@makeother\"\@verbatim
\frenchspacing \@vobeyspaces \@vobeytabs
\input \example_name
\endverbatim
\endgroup
%\hrule height\z@
\end{minipage}%
}
\def\example{
\par
\immediate\openout\example_file\example_name
\begingroup
\@makeother\"\let\do\@makeother \dospecials
\obeylines \obeyspaces
\@ignoretrue \copy_line
}
\begingroup
\catcode`\|=\escape % | is temporary escape character
\catcode`\[=\open % [ and ] are temporary grouping symbols
\catcode`\]=\close
\catcode`\{=\other % these are `other' in verbatim mode
\catcode`\}=\other
\catcode`\\=|other
|gdef|end_of_example[\end{example}]
|endgroup
\begingroup
\obeylines \gdef\copy_line#1^^M{\write_line{#1}}%
\endgroup
\def\write_line#1{%
\def\Next{#1}%
\ifx \Next\end_of_example
\def\Next{\end{example}}% % finish example
\else
\ifx \Next\empty
\if@ignore % ignore empty lines at the beginning
\else % but write them out later
\immediate\write\example_file{\Next}%
\fi
\else
\immediate\write\example_file{\Next}%
\@ignorefalse % at least one non-empty line written
\fi
\let\Next\copy_line % next line of example
\fi
\Next
}
\def\endexample{%
\endgroup
\immediate\closeout\example_file
\penalty \predisplaypenalty
\vskip \abovedisplayskip
% \leftline{\ExampleVerb \hskip\columnsep \ExampleSet}%
\leftline{\ExampleVerb \hfill \ExampleSet}%
\penalty \postdisplaypenalty
\vskip \belowdisplayskip
}
\catcode`\_=\uscode
\endinput
|
