% This file is part of the Petri-nets packages. See file README for
% copyright notice.

\ProvidesPackage{pndraw}

\newenvironment{petrinet}{\beginnet}{\endnet}

%%
%% running standard LaTeX
%%

\usepackage{ifpdf}

\ifpdf
  \relax
\else
  \input pndraw.tex
  \endinput
\fi

%%
%% running pdfLaTeX
%%

\message{ ** Petri-nets / draw commands ** }

\input pnversion

\usepackage{graphicx}

\newcounter{pncount}
\setcounter{pncount}{1}

\catcode`\:=11

%%
%% check for write18
%%

\begingroup
  \edef\test{\jobname.\the\year\the\month\the\day\the\time}
  \immediate\write18{pn2pdf --test \test}
  \IfFileExists\test{
    \global\def\pnpdf:run ##1{\immediate\write18{pn2pdf ##1}}
    \pnpdf:run{--delete \test}
  }{
    \newwrite\pnpdf:batch
    \immediate\openout\pnpdf:batch=\jobname.bpn
    \global\def\pnpdf:run ##1{\immediate\write\pnpdf:batch{pn2pdf ##1}}
    \AtEndDocument{\pnpdf:run{--delete \jobname.bpn}}
  }
\endgroup

\let\pnpdf:warn=\relax

\newwrite\pnpdf:stream

\def\pnpdf:open:always{%
  \edef\pnpdf:file{\jobname-fig\thepncount.pn}%
  \immediate\openout\pnpdf:stream=\pnpdf:file
  \global\let\pnpdf:open=\relax}
\global\let\pnpdf:open=\pnpdf:open:always

\def\pnpdf:write #1{\pnpdf:open
  \immediate\write\pnpdf:stream{#1}}

\begingroup
  \catcode`|=0
  \catcode`[=1
  \catcode`]=2
  \catcode`\{=12
  \catcode`\}=12
  \catcode`\\=12
  |long|gdef|pnpdf:read #1\end{petrinet}[|pnpdf:write[#1]|end[petrinet]]
|endgroup

{\catcode`\^^M=\active %
\gdef\pnpdf:catcodes{\bgroup %
  \catcode`\{=12 \catcode`\}=12 \catcode`\$=12 %
  \catcode`\&=12 \catcode`\#=12 \catcode`\^=12 %
  \catcode`\%=12 \catcode`\ =12 \catcode`\_=12 %
  \catcode`\~=12 \catcode`\\=12 \catcode`\^^M=\active \def^^M{^^J}}}

{\catcode`\%=12 \catcode`\!=14 \catcode`\^^M=\active !
 \gdef\beginnet{\pnpdf:write{\string\begin{petrinet}\string%}!
   \catcode`\^^M=\active\let^^M=\relax !
   \pnpdf:catcodes\pnpdf:read}}

\def\show:net:always{%
  \IfFileExists{\jobname-fig\thepncount.pdf}%
               {\includegraphics{\jobname-fig\thepncount.pdf}}%
               {\message{<missing \jobname-fig\thepncount.pdf>}%
                \global\def\pnpdf:warn{\typeout{^^J*** Run "pn2pdf
                  --batch \jobname.bpn" in order to build the
                  figures^^J}}}}

\def\endnet{\egroup
  \pnpdf:write{\string\end{petrinet}}%
  \immediate\closeout\pnpdf:stream
  \global\let\pnpdf:open=\pnpdf:open:always
  \pnpdf:run{\jobname-fig\thepncount.pn}%
  \show:net\addtocounter{pncount}{1}}

\let\show:net=\show:net:always
\def\savenet{\global\def\show:net{\global\let\show:net\show:net:always}}

\def\shownet{\addtocounter{pncount}{-1}\show:net:always
             \addtocounter{pncount}{1}}

\def\everynet{\begingroup\afterassignment\endgroup\toks0}
\def\everylabel{\begingroup\afterassignment\endgroup\toks0}
\def\psset #1{}
\def\nodessize #1{}
\def\placesize{\begingroup\afterassignment\endgroup\dimen0}
\def\transsize{\begingroup\afterassignment\endgroup\dimen0}
\def\storesize{\begingroup\afterassignment\endgroup\dimen0}
\def\modulesize{\begingroup\afterassignment\endgroup\dimen0}
\def\sourcesize{\begingroup\afterassignment\endgroup\dimen0}

\AtBeginDocument{
  \def\everynet{\bgroup\afterassignment\everynet:next\toks0}
  \def\everynet:next{\pnpdf:write{\string\everynet{\expandafter
    \noexpand\the\toks0}}\egroup}
  \def\everylabel{\bgroup\afterassignment\everylabel:next\toks0}
  \def\everylabel:next{\pnpdf:write{\string\everylabel{\expandafter
    \noexpand\the\toks0}}\egroup}
  \def\psset{\bgroup\afterassignment\psset:next\toks0}
  \def\psset:next{\pnpdf:write{\string\psset{\expandafter
    \noexpand\the\toks0}}\egroup}
  \def\nodessize{\bgroup\afterassignment\nodessize:next\toks0}
  \def\nodessize:next{\pnpdf:write{\string\nodessize{\expandafter
    \noexpand\the\toks0}}\egroup}
  \def\placesize{\bgroup\afterassignment\placesize:next\dim0}
  \def\placesize:next{\edef\command{{\string\placesize=\the\dim0}}%
    \expandafter\pnpdf:write\command}
  \def\transsize{\bgroup\afterassignment\transsize:next\dim0}
  \def\transsize:next{\edef\command{{\string\transsize=\the\dim0}}%
    \expandafter\pnpdf:write\command}
  \def\storesize{\bgroup\afterassignment\storesize:next\dim0}
  \def\storesize:next{\edef\command{{\string\storesize=\the\dim0}}%
    \expandafter\pnpdf:write\command}
  \def\modulesize{\bgroup\afterassignment\modulesize:next\dim0}
  \def\modulesize:next{\edef\command{{\string\modulesize=\the\dim0}}%
    \expandafter\pnpdf:write\command}
  \def\sourcesize{\bgroup\afterassignment\sourcesize:next\dim0}
  \def\sourcesize:next{\edef\command{{\string\sourcesize=\the\dim0}}%
    \expandafter\pnpdf:write\command}}

\AtEndDocument{\pnpdf:run{--delete \jobname.pre}
               \pnpdf:warn}

\catcode`\:=12