tikz-tikzpicture-expansion.tex

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{unravel}
\unravelsetup{max-action=1000, max-input=1000}

\makeatletter
\let\tikz@ensure@dollar@catcode\relax
\makeatother

\begin{document}
\catcode`$=12
\unravel{%
  \begin{tikzpicture}
    \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
  \end{tikzpicture}
}
\end{document}


expand \begin, #1 = "tikzpicture"

\def\@currenvir{tikzpicture}
\begingroup
\tikzpicture
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


% tex/generic/pgf/frontendlayer/tikz/tikz.code.tex
\def\tikzpicture{%
  \begingroup%
    \tikz@startup@env%
    \tikz@collect@scope@anims\tikz@picture}%

expand \tikzpicture

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \tikz@startup@env%
  \tikz@collect@scope@anims\tikz@picture
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


\def\tikz@startup@env{%
  \ifnum\the\catcode`\;=\active\relax\expandafter\let\expandafter\tikz@origsemi\expandafter=\tikz@activesemicolon\fi%
  \ifnum\the\catcode`\:=\active\relax\expandafter\let\expandafter\tikz@origcolon\expandafter=\tikz@activecolon\fi%
  \ifnum\the\catcode`\|=\active\relax\expandafter\let\expandafter\tikz@origbar\expandafter=\tikz@activebar\fi%
  \tikz@deactivatthings%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
}%

expand \tikz@startup@env
expand three \ifnum: false, false, false

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \tikz@deactivatthings%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \tikz@collect@scope@anims\tikz@picture
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


{%
  \catcode`\;=12
  \gdef\tikz@nonactivesemicolon{;}%
  \catcode`\:=12
  \gdef\tikz@nonactivecolon{:}%
  \catcode`\|=12
  \gdef\tikz@nonactivebar{|}%
  \catcode`\!=12
  \gdef\tikz@nonactiveexlmark{!}%
  \catcode`\;=\active
  \catcode`\:=\active
  \catcode`\|=\active
  \catcode`\"=\active
  \catcode`\!=\active
  \gdef\tikz@activesemicolon{;}%
  \gdef\tikz@activecolon{:}%
  \gdef\tikz@activebar{|}%
  \gdef\tikz@activequotes{"}%
  \global\let\tikz@active@quotes@token="%
  \gdef\tikz@activeexlmark{!}%
  \gdef\tikz@deactivatthings{%
    \def;{\tikz@nonactivesemicolon}%
    \def:{\tikz@nonactivecolon}%
    \def|{\tikz@nonactivebar}%
    \def!{\tikz@nonactiveexlmark}%
  }%
}%

expand \tikz@deactivatthings

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \def;{\tikz@nonactivesemicolon}%
  \def:{\tikz@nonactivecolon}%
  \def|{\tikz@nonactivebar}%
  \def!{\tikz@nonactiveexlmark}%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \tikz@collect@scope@anims\tikz@picture
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


expand \iftikz@handle@active@code: false

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \tikz@collect@scope@anims\tikz@picture
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


\def\tikz@collect@scope@anims#1{%
  \pgfutil@ifnextchar[#1{#1[]}%]
}%

expand \tikz@collect@scope@anims, #1 = "\tikz@picture"

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \pgfutil@ifnextchar[\tikz@picture{\tikz@picture[]}
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


% tex/generic/pgf/utilities/pgfutil-common.tex
\long\def\pgfutil@ifnextchar#1#2#3{%
  \let\pgfutil@reserved@d=#1%
  \def\pgfutil@reserved@a{#2}%
  \def\pgfutil@reserved@b{#3}%
  \futurelet\pgfutil@let@token\pgfutil@ifnch}

expand \pgfutil@ifnextchar, #1 = "[", #2 = "\tikz@picture", #2 = "\tikz@picture[]"

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \tikz@picture[]
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


\def\tikz@picture[#1]{%
  %\tikz@check@inside@picture%
  \pgfpicture%
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,#1]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
}%

expand \tikz@picture, #1 = ""

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
  \pgfpicture%
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


% tex/generic/pgf/basiclayer/pgfcorescopes.code.tex
\def\pgfpicture{%
  \begingroup%
    \pgfpicturetrue%
    \global\advance\pgf@picture@serial@count by1\relax%
    \edef\pgfpictureid{pgfid\the\pgf@picture@serial@count}%
    \let\pgf@nodecallback=\pgfutil@gobble%
    \pgf@picmaxx=-16000pt\relax%
    \pgf@picminx=16000pt\relax%
    \pgf@picmaxy=-16000pt\relax%
    \pgf@picminy=16000pt\relax%
    \pgf@relevantforpicturesizetrue%
    \pgf@resetpathsizes%
    \pgfutil@ifnextchar\bgroup\pgf@oldpicture\pgf@picture}

expand \pgfpicture

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
\begingroup%
  \pgfpicturetrue%
  \global\advance\pgf@picture@serial@count by1\relax%
  \edef\pgfpictureid{pgfid\the\pgf@picture@serial@count}%
  \let\pgf@nodecallback=\pgfutil@gobble%
  \pgf@picmaxx=-16000pt\relax%
  \pgf@picminx=16000pt\relax%
  \pgf@picmaxy=-16000pt\relax%
  \pgf@picminy=16000pt\relax%
  \pgf@relevantforpicturesizetrue%
  \pgf@resetpathsizes%
  \pgfutil@ifnextchar\bgroup\pgf@oldpicture\pgf@picture
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


expand \pgfpicturetrue
expand \advance, \edef, ..., \pgf@relevantforpicturesizetrue


\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
\begingroup%
  \pgf@resetpathsizes%
  \pgfutil@ifnextchar\bgroup\pgf@oldpicture\pgf@picture
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


% tex/generic/pgf/basiclayer/pgfcorepathconstruct.code.tex
\def\pgf@resetpathsizes{%
  \global\pgf@pathmaxx=-16000pt\relax%
  \global\pgf@pathminx=16000pt\relax%
  \global\pgf@pathmaxy=-16000pt\relax%
  \global\pgf@pathminy=16000pt\relax%
}

expand \pgf@resetpathsizes

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
\begingroup%
  \pgfutil@ifnextchar\bgroup\pgf@oldpicture\pgf@picture
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


expand \pgfutil@ifnextchar

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
\begingroup%
  \pgf@picture
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}


\def\pgf@picture{%
  \setbox\pgfpic\hbox to0pt\bgroup%
    \begingroup%
    \pgfsys@beginpicture%
      \pgfsys@beginscope%
        \begingroup%
        \pgfsetcolor{.}%
        \pgfsetlinewidth{0.4pt}%
        \pgftransformreset%
        \pgfsyssoftpath@setcurrentpath\pgfutil@empty%
        \begingroup%
          \let\pgf@setlengthorig=\setlength%
          \let\pgf@addtolengthorig=\addtolength%
          \let\pgf@selectfontorig=\selectfont%
          \let\setlength=\pgf@setlength%
          \let\addtolength=\pgf@addtolength%
          \let\selectfont=\pgf@selectfont%
          \nullfont\spaceskip0pt\xspaceskip0pt%
          \setbox\pgf@layerbox@main\hbox to0pt\bgroup%
            \begingroup%
  }

% step 249
expand \pgf@picture

\def\@currenvir{tikzpicture}
\begingroup
\begingroup%
\begingroup%
  \setbox\pgfpic\hbox to0pt\bgroup%
    \begingroup%
    \pgfsys@beginpicture%  empty
      \pgfsys@beginscope%  \pgfsysprotocol@literal{q}
        \begingroup%
        \pgfsetcolor{.}%
        \pgfsetlinewidth{0.4pt}%
        \pgftransformreset%
        \pgfsyssoftpath@setcurrentpath\pgfutil@empty%
        \begingroup%
          \let\pgf@setlengthorig=\setlength%
          \let\pgf@addtolengthorig=\addtolength%
          \let\pgf@selectfontorig=\selectfont%
          \let\setlength=\pgf@setlength%
          \let\addtolength=\pgf@addtolength%
          \let\selectfont=\pgf@selectfont%
          \nullfont\spaceskip0pt\xspaceskip0pt%
          \setbox\pgf@layerbox@main\hbox to0pt\bgroup%
            \begingroup%
  \let\tikz@atbegin@picture=\pgfutil@empty%
  \let\tikz@atend@picture=\pgfutil@empty%
  \let\tikz@transform=\relax%
  \def\tikz@time{.5}%
  \tikz@installcommands%
  \scope[every picture,]%
  \iftikz@handle@active@code%
    \tikz@switchoff@shorthands%
  \fi%
  \expandafter\tikz@atbegin@picture%
  \tikz@lib@scope@check%
  \path[draw] ($ (0, 0) + (0, 0) $) -- (1, 0);
\end{tikzpicture}




%TODO

% step 3697
\tikzset {every path/.try}%
\tikz@scan@next@command [draw]($ (0, 0) + (0, 0) $) -- (1, 0); \end {tikzpicture} 

% step 4242
\tikz@scan@next@command ($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


\def\tikz@scan@next@command{%
  \ifx\tikz@collected@onpath\pgfutil@empty% 
  \else%
    \tikz@invoke@collected@onpath%
  \fi%
  \afterassignment\tikz@handle\let\pgf@let@token=%
}%

expand \tikz@scan@next@command

\ifx\tikz@collected@onpath\pgfutil@empty%  true
\else%
  \tikz@invoke@collected@onpath%
\fi%
\afterassignment\tikz@handle\let\pgf@let@token=%
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


expand \ifx

\afterassignment\tikz@handle\let\pgf@let@token=%
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


expand \afterassignment
expand \let

\let\pgf@let@token=%
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


\def\tikz@handle{%
  \let\pgfutil@next=\tikz@expand%
  \ifx\pgf@let@token(%)  true
    \let\pgfutil@next=\tikz@movetoabs%  \tikz@moveto(
  \else%
    \ifx\pgf@let@token+%
      \let\pgfutil@next=\tikz@movetorel%
    \else%
      \ifx\pgf@let@token-%
        \let\pgfutil@next=\tikz@lineto%
      \else%
        \ifx\pgf@let@token.%
          \let\pgfutil@next=\tikz@dot%
        \else%
          \ifx\pgf@let@token r%
            \let\pgfutil@next=\tikz@rect%
          \else%
            \ifx\pgf@let@token n%
              \let\pgfutil@next=\tikz@fig%
            \else%
              \ifx\pgf@let@token[%]
                \let\pgfutil@next=\tikz@parse@options%
              \else%
                \ifx\pgf@let@token c%
                  \let\pgfutil@next=\tikz@cchar%
                \else%
                  \ifx\pgf@let@token\bgroup%
                    \let\pgfutil@next=\tikz@beginscope%
                  \else%
                    \ifx\pgf@let@token\egroup%
                      \let\pgfutil@next=\tikz@endscope%
                    \else%
                      \ifx\pgf@let@token;%
                        \let\pgfutil@next=\tikz@finish%
                      \else%
                        \let\pgfutil@next=\tikz@handle@more%
                      \fi%
                    \fi%
                  \fi%
                \fi%
              \fi%
            \fi%
          \fi%
        \fi%
      \fi%
    \fi%
  \fi%
  \pgfutil@next%
}%

expand \tikz@handle
expand \let
expand \ifx: true

\let\pgf@let@token=%
\let\pgfutil@next=\tikz@expand
\let\pgfutil@next=\tikz@movetoabs
\pgfutil@next% 
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


\def\tikz@movetoabs{\tikz@moveto(}%

expand \pgfutil@next

\let\pgf@let@token=%
\tikz@moveto(
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


\def\tikz@moveto{%
  \tikz@scan@one@point{\tikz@@moveto}}%

expand \tikz@moveto

\let\pgf@let@token=%
\tikz@scan@one@point{\tikz@@moveto}(
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


\def\tikz@scan@one@point#1{%
  \let\tikz@to@use@whom=\tikz@to@use@last@coordinate%
  \tikz@shapeborderfalse%
  \pgfutil@ifnextchar+{\tikz@scan@relative#1}{\tikz@scan@absolute#1}}%

expand \tikz@scan@one@point, #1 = "\tikz@@moveto"

\let\tikz@to@use@whom=\tikz@to@use@last@coordinate%
\tikz@shapeborderfalse%
\pgfutil@ifnextchar+{\tikz@scan@relative\tikz@@moveto}{\tikz@scan@absolute\tikz@@moveto}
(
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


% steo 4286
expand \pgfutil@ifnextchar

\let\tikz@to@use@whom=\tikz@to@use@last@coordinate%
\tikz@shapeborderfalse%
\tikz@scan@absolute\tikz@@moveto
(
\tikz@handle
($ (0, 0) + (0, 0) $) -- (1, 0);
\end {tikzpicture}


% step 4305
\tikz@scan@@absolute \tikz@@moveto 
($ (0, 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


% tikz.code.tex
\def\tikz@scan@@absolute#1({%
  \pgfutil@ifnextchar[% uhoh... options!
  {\def\tikz@scan@point@recall{#1}\tikz@scan@options}%
  {\tikz@@@scan@@absolute#1(}%
}%

expand \tikz@scan@@absolute, #1 = "\tikz@@moveto"
expand \pgfutil@ifnextchar

\tikz@@@scan@@absolute\tikz@@moveto(%
$ (0, 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


% tikz.code.tex
\def\tikz@@@scan@@absolute#1({%
  \tikz@ensure@dollar@catcode%  let to \relax in mwe
  \pgfutil@ifnextchar{$}%$
  {\tikz@parse@calculator#1(}
  {\tikz@scan@no@calculator#1(}%
}%

$
expand \tikz@scan@@absolute, #1 = "\tikz@@moveto"
expand \tikz@ensure@dollar@catcode
expand \pgfutil@ifnextchar

\tikz@scan@no@calculator\tikz@@moveto(%
$ (0, 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


\def\tikz@scan@no@calculator#1(#2){%
  \edef\tikz@scan@point@coordinate{(#2)}%
  \expandafter\tikz@@scan@@no@calculator\expandafter#1\tikz@scan@point@coordinate%
}%

expand \tikz@scan@no@calculator, #1 = "\tikz@@moveto", #2 = "$ (0, 0"
$

\edef\tikz@scan@point@coordinate{($ (0, 0)}%
\expandafter\tikz@@scan@@no@calculator
\expandafter\tikz@@moveto
\tikz@scan@point@coordinate%
 + (0, 0) $) -- (1, 0); 
\end{tikzpicture}


expand \edef
expand \tikz@scan@point@coordinate

\tikz@@scan@@no@calculator
\tikz@@moveto
($ (0, 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture}


\def\tikz@@scan@@no@calculator#1(#2){%
  \pgfutil@in@{cs:}{#2}%
  \ifpgfutil@in@%  false
    \let\pgfutil@next\tikz@parse@coordinatesystem%
  \else%
    \pgfutil@in@{intersection }{#2}%
    \ifpgfutil@in@%  false
      \let\pgfutil@next\tikz@parse@intersection%
    \else%
      \pgfutil@in@|{#2}%  false
      \ifpgfutil@in@
        \pgfutil@in@{-|}{#2}%
        \ifpgfutil@in@
          \let\pgfutil@next\tikz@parse@hv%
        \else%
          \let\pgfutil@next\tikz@parse@vh%
        \fi%
      \else%
        \pgfutil@in@:{#2}%  false
        \ifpgfutil@in@
          \let\pgfutil@next\tikz@parse@polar%
        \else%
          \pgfutil@in@,{#2}%  true
          \ifpgfutil@in@%
            \let\pgfutil@next\tikz@parse@regular%
          \else%
            \let\pgfutil@next\tikz@parse@node%
          \fi%
        \fi%
      \fi%
    \fi%
  \fi%
  \pgfutil@next#1(#2)%
}%

% step 4355
expand \tikz@@scan@@no@calculator， #1 = "\tikz@@moveto"， #2 = "$ (0, 0"
$ 
execute \let\pgfutil@next\tikz@parse@regular%

\tikz@parse@regular\tikz@@moveto
($ (0, 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


\def\tikz@parse@regular#1(#2,{%
    \pgfutil@ifnextchar\bgroup{\tikz@@parse@regular#1{#2}}{\tikz@@@parse@regular#1{#2}}%
}%

expand \tikz@parse@regular, #1 = "\tikz@@moveto", #2 = "$ (0"
$

\pgfutil@ifnextchar\bgroup
  {\tikz@@parse@regular\tikz@@moveto{$ (0}}
  {\tikz@@@parse@regular\tikz@@moveto{$ (0}}% 
 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


expand \pgfutil@ifnextchar

\tikz@@@parse@regular\tikz@@moveto{$ (0}%
 0) + (0, 0) $) -- (1, 0); 
\end{tikzpicture} 


% Originally \def\tikz@parse@regular#1(#2,#3){%
%
\def\tikz@@@parse@regular#1#2#3){%
  \pgfutil@in@,{#3}%
  \ifpgfutil@in@%
    \tikz@parse@splitxyz{#1}{#2}#3,%
  \else%
    \tikz@checkunit{#2}%
    \iftikz@isdimension%
      \tikz@checkunit{#3}%
      \iftikz@isdimension%
        \def\pgfutil@next{#1{\pgfpoint{#2}{#3}}}%
      \else%
        \def\pgfutil@next{#1{\pgfpointadd{\pgfpoint{#2}{0pt}}{\pgfpointxy{0}{#3}}}}%
      \fi%
    \else%
      \tikz@checkunit{#3}%
      \iftikz@isdimension%
        \def\pgfutil@next{#1{\pgfpointadd{\pgfpoint{0pt}{#3}}{\pgfpointxy{#2}{0}}}}%
      \else%
        \def\pgfutil@next{#1{\pgfpointxy{#2}{#3}}}%
      \fi%
    \fi%
  \fi%
  \pgfutil@next%
}%

expand \tikz@@parse@regular