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+% Copyright 2008 by Christian Feuersaenger
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU Public License.
+%
+% See the file doc/generic/pgf/licenses/LICENSE for more details.
+%
+%
+% This file provides a high-level automatic export feature for tikz pictures.
+% It allows to export EACH SINGLE FIGURE into a separate PDF.
+%
+% The simplest way is to use
+%
+% \tikzexternalize{myarticle}
+%
+% it simply converts every figure using the write18 method. If that is not possible,
+% you need to reconfigure \tikzexternalize: it can generate a list of figure file names
+% and you need to generate these figures manually (or with a script).
+%
+% It replaces \tikzpicture/ \endtikzpicture and \tikz and invokes \beginpgfgraphicnamed ... \endpgfgraphicnamed
+% commands if necessary.
+
+% source generic implementation:
+\input tikzexternalshared.code.tex
+
+\def\tikzexternal@TEXDIALECT@begpicture{\begin{tikzpicture}}
+\def\tikzexternal@TEXDIALECT@endpicture{\end{tikzpicture}}%
+
+% this latex specific this assumes it starts at the beginning of an
+% environment. The environment is named
+% '\tikzexternal@laTeX@collect@until@end@tikzpicturetikzpicturestring'.
+%
+% Everything up to \end{<name>} will be collected and passed as
+% argument to the macro '#1'.
+%
+% This does also work if <name> is NOT tikzpicture!
+\def\tikzexternal@TEXDIALECT@collectpicture#1{%
+ \begingroup
+ \t@tikzexternal@tmpa={}%
+ \tikzexternal@laTeX@collect@until@end@tikzpicture{#1}%
+}
+
+% Loop until we find '\end{tikzpicture}'. We have to make sure that
+% even strings like '#1' are allowed inside of the collected argument.
+\long\def\tikzexternal@laTeX@collect@until@end@tikzpicture#1#2\end#3{%
+ \def\tikzexternal@laTeX@collect@until@end@tikzpicture@{#3}%
+ \ifx\tikzexternal@laTeX@collect@until@end@tikzpicture@\tikzexternal@laTeX@collect@until@end@tikzpicturetikzpicturestring
+ \t@tikzexternal@tmpa=\expandafter{\the\t@tikzexternal@tmpa #2}%
+ \edef\tikzexternal@TEXDIALECT@collectpicture@next{%
+ \noexpand\endgroup
+ \noexpand#1{\the\t@tikzexternal@tmpa}%
+ }%
+ \else
+ \t@tikzexternal@tmpa=\expandafter{\the\t@tikzexternal@tmpa #2\end{#3}}%
+ \def\tikzexternal@TEXDIALECT@collectpicture@next{%
+ \tikzexternal@laTeX@collect@until@end@tikzpicture{#1}}%
+ \fi
+ \tikzexternal@TEXDIALECT@collectpicture@next
+}%
+\def\tikzexternal@laTeX@collect@until@end@tikzpicturetikzpicturestring{tikzpicture}%
+
+\AtBeginDocument{%
+ \pgfutil@ifundefined{tikzexternalrealjob}{%
+ \global\let\tikzexternalrealjob=\jobname
+ }{}%
+}%