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-% Copyright 2006 by Till Tantau
-%
-% 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 utitiliy commands that are used throughout pgf.
-%
-% For most commands, the definition of these commands is just given
-% below. We cannot use the LaTeX definition of these commands since
-% LaTeX may not be the current format and since LaTeX packages tend to
-% redefine these commands.
-%
-% For some commands the actual definition of the format (like latex or
-% context) is to be preferred over the generic definition below. In
-% this case, the definition of the format is installed when the file
-% pgfutil-XXXX.tex is read, where XXXX is the format name (latex,
-% plain, or context).
-
-
-
-\catcode`\@=11\relax
-
-
-% Simple stuff
-
-\long\def\pgfutil@ifundefined#1{%
- \expandafter\ifx\csname#1\endcsname\relax
- \expandafter\pgfutil@firstoftwo
- \else
- \expandafter\pgfutil@secondoftwo
- \fi}
-\def\pgfutil@firstofone#1{#1}
-\def\pgfutil@firstoftwo#1#2{#1}
-\def\pgfutil@secondoftwo#1#2{#2}
-\def\pgfutil@empty{}
-\def\pgfutil@gobble#1{}
-\def\pgfutil@gobbletwo#1#2{}
-\def\pgfutil@namedef#1{\expandafter\def\csname #1\endcsname}
-\long\def\pgfutil@g@addto@macro#1#2{%
- \begingroup
- \toks@\expandafter{#1#2}%
- \xdef#1{\the\toks@}%
- \endgroup}
-\newif\ifpgfutil@tempswa
-
-% pgfutil@ifnextchar
-
-\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}
-\def\pgfutil@ifnch{%
- \ifx\pgfutil@let@token\pgfutil@sptoken
- \let\pgfutil@reserved@c\pgfutil@xifnch
- \else
- \ifx\pgfutil@let@token\pgfutil@reserved@d
- \let\pgfutil@reserved@c\pgfutil@reserved@a
- \else
- \let\pgfutil@reserved@c\pgfutil@reserved@b
- \fi
- \fi
- \pgfutil@reserved@c}
-{%
- \def\:{\global\let\pgfutil@sptoken= } \:
- \def\:{\pgfutil@xifnch} \expandafter\gdef\: {\futurelet\pgfutil@let@token\pgfutil@ifnch}
-}
-
-% pgfutil@in@
-
-\newif\ifpgfutil@in@
-\def\pgfutil@in@#1#2{%
- \def\pgfutil@in@@##1#1##2##3\pgfutil@in@@{%
- \ifx\pgfutil@in@##2\pgfutil@in@false\else\pgfutil@in@true\fi}%
- \pgfutil@in@@#2#1\pgfutil@in@\pgfutil@in@@}
-
-
-% pgfutil@for
-
-\def\pgfutil@nnil{\pgfutil@nil}
-\def\pgfutil@fornoop#1\@@#2#3{}
-\long\def\pgfutil@for#1:=#2\do#3{%
- \expandafter\def\expandafter\pgfutil@fortmp\expandafter{#2}%
- \ifx\pgfutil@fortmp\pgfutil@empty \else
- \expandafter\pgfutil@forloop#2,\pgfutil@nil,\pgfutil@nil\@@#1{#3}\fi}
-\long\def\pgfutil@forloop#1,#2,#3\@@#4#5{\def#4{#1}\ifx #4\pgfutil@nnil \else
- #5\def#4{#2}\ifx #4\pgfutil@nnil \else#5\pgfutil@iforloop #3\@@#4{#5}\fi\fi}
-\long\def\pgfutil@iforloop#1,#2\@@#3#4{\def#3{#1}\ifx #3\pgfutil@nnil
- \expandafter\pgfutil@fornoop \else
- #4\relax\expandafter\pgfutil@iforloop\fi#2\@@#3{#4}}
-\def\pgfutil@tfor#1:={\pgfutil@tf@r#1 }
-\long\def\pgfutil@tf@r#1#2\do#3{\def\pgfutil@fortmp{#2}\ifx\pgfutil@fortmp\space\else
- \pgfutil@tforloop#2\pgfutil@nil\pgfutil@nil\@@#1{#3}\fi}
-\long\def\pgfutil@tforloop#1#2\@@#3#4{\def#3{#1}\ifx #3\pgfutil@nnil
- \expandafter\pgfutil@fornoop \else
- #4\relax\expandafter\pgfutil@tforloop\fi#2\@@#3{#4}}
-
-
-% pgfutil@IfFileExists
-
-\chardef\pgfutil@inputcheck0
-\def\pgfutil@IfFileExists#1#2#3{%
- \openin\pgfutil@inputcheck#1 %
- \ifeof\pgfutil@inputcheck
- #3\relax
- \else
- #2\relax
- \fi
- \closein\pgfutil@inputcheck}
-
-\def\pgfutil@InputIfFileExists#1#2#3{\pgfutil@IfFileExists{#1}{\input #1\relax#2}{#3}}%
-
-
-% aux-read-hook
-
-\let\pgfutil@aux@read@hook=\relax
-
-
-\endinput