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-% This file defines utilities common to the \pgfmath files.
-%
-% (c) 2007 Mark Wibrow
-%
-% but subject to the LaTeX Project Public License
-% (http://www.latex-project.org/lppl.txt)
-%
-% and the GNU Public License
-% (http://www.gnu.org/licenses/gpl.txt)
-%
-% Version 0.0 08/03/2007
-
-% Alias some pgf stuff, just in case it needs replacing later.
-%
-\let\pgfmath@x\pgf@x
-\let\pgfmath@xa\pgf@xa
-\let\pgfmath@xb\pgf@xb
-\let\pgfmath@xc\pgf@xc
-
-\let\pgfmath@y\pgf@y
-\let\pgfmath@ya\pgf@ya
-\let\pgfmath@yb\pgf@yb
-\let\pgfmath@yc\pgf@yc
-
-\let\c@pgfmath@counta\c@pgf@counta
-\let\c@pgfmath@countb\c@pgf@countb
-\let\c@pgfmath@countc\c@pgf@countc
-
-\let\pgfmath@ifnextchar\pgfutil@ifnextchar
-
-\let\pgfmath@tonumber\pgf@sys@tonumber
-
-\let\pgfmath@ifundefined\pgfutil@ifundefined
-
-\newif\ifpgfmath@in@
-\def\pgfmath@in@#1#2{%
- \def\pgfmath@in@@##1#1##2##3\pgfmath@in@@{%
- \ifx\pgfmath@in@##2\pgfmath@in@false\else\pgfmath@in@true\fi}%
- \pgfmath@in@@#2#1\pgfmath@in@\pgfmath@in@@}
-
-% Need to redefine to something more appropriate...?
-%
-\def\pgfmath@error#1#2{\PackageError{PGF Math}{#1}{#2}}
-\def\pgfmath@warning#1#2{\PackageWarning{PGF Math}{#1}{#2}}
-
-% \pgfmath@pt
-%
-% Needed to test for 'pt' resulting from
-% expansion using \the.
-%
-{\catcode`\p=12\catcode`\t=12\gdef\PgfmaTh@PT{pt}}
-\edef\pgfmath@pt{\PgfmaTh@PT}%
-
-% \pgfmath@ifin@
-%
-% Interface for \pgfutil@in@
-%
-\def\pgfmath@ifin@#1#2{%
- \pgfutil@in@{#1}{#2}%
- \ifpgfutil@in@%
- \expandafter\pgfmath@firstoftwo%
- \else%
- \expandafter\pgfmath@secondoftwo%
- \fi%
-}
-
-% \pgfmath@empty
-%
-% A handy macro.
-%
-\def\pgfmath@empty{}
-
-
-% \ifpgfmath@empty
-%
-% Has #1 been let to \pgf@empty?
-%
-\def\ifpgfmath@empty#1{%
- \ifx#1\pgfmath@empty\relax
- \expandafter\pgfmath@firstoftwo%
- \else%
- \expandafter\pgfmath@secondoftwo%
- \fi%
-}
-\def\pgfmath@firstoftwo#1#2{#1}
-\def\pgfmath@secondoftwo#1#2{#2}
-
-% \ifpgfmath@ifletto
-%
-% Has #1 been let to #2?
-%
-\def\pgfmath@ifletto#1#2{%
- \ifx#1#2\relax%
- \expandafter\pgfmath@firstoftwo%
- \else%
- \expandafter\pgfmath@secondoftwo%
- \fi%
-}
-
-% \ifpgfmath@iflettoeither
-%
-% Has #1 been let to #2 or #3?
-%
-\def\pgfmath@iflettoeither#1#2#3{%
- \ifx#1#2\relax%
- \let\pgfmath@equaltoeithernext\pgfmath@firstoftwo%
- \else%
- \ifx#1#3\relax%
- \let\pgfmath@equaltoeithernext\pgfmath@firstoftwo%
- \else%
- \let\pgfmath@equaltoeithernext\pgfmath@secondoftwo%
- \fi%
- \fi%
- \pgfmath@equaltoeithernext%
-}
-
-% \pgfmath@gobbletilpgfmath@
-%
-% Gobble stream until \pgfmath@ {which is undefined}.
-%
-\def\pgfmath@gobbletilpgfmath@#1\pgfmath@{}
-\def\pgfmath@gobbleone#1{}%
-
-
-% \pgfmathloop
-%
-% A version of the standard TeX and LaTeX
-% \loop, with an additional macro \pgfmathcounter
-% (which is *not* a TeX counter) which keeps
-% track of the iterations.
-%
-\newif\ifpgfmathcontinueloop
-\def\pgfmathloop#1\repeatpgfmathloop{%
- \def\pgfmathcounter{1}%
- \def\pgfmath@iterate{%
- #1\relax%
- {% Do this inside a group, just in case...
- \c@pgfmath@counta=\pgfmathcounter%
- \advance\c@pgfmath@counta by1\relax%
- \xdef\pgfmathloop@temp{\the\c@pgfmath@counta}%
- }%
- \edef\pgfmathcounter{\pgfmathloop@temp}%
- \expandafter\pgfmath@iterate\fi}%
- \pgfmath@iterate\let\pgfmath@iterate=\relax}
-\let\repeatpgfmathloop=\fi
-
-
-% \pgfmath@returnone
-%
-% \edef \pfgmathresult to the value of #1 after the end
-% of a group.
-%
-% #1 - a dimension/count/skip register or a macro
-% representing a number or dimension.
-%
-\def\pgfmath@returnone#1{%
- \afterassignment\pgfmath@gobbletilpgfmath@%
- \pgfmath@x#1pt\relax\pgfmath@%
- \xdef\pgfmath@resulttemp{\pgf@sys@tonumber{\pgfmath@x}}%
- \gdef\pgfmath@returnone@{%
- \edef\pgfmathresult{\pgfmath@resulttemp}%
- }%
- \aftergroup\pgfmath@returnone@}
-
-
-% \pgfmath@returntwo
-%
-% \edef \pfgmathresultx to the value of #1, and
-% \pgfmathresulty to the value of #2, after the end
-% of a group.
-%
-% #1 - a dimension/count/skip register or a macro
-% representing a number or dimension.
-%
-% #2 - a dimension/count/skip register or a macro
-% representing a number or dimension.
-%
-\def\pgfmath@returntwo#1#2{%
- \afterassignment\pgfmath@gobbletilpgfmath@%
- \pgfmath@x#1pt\relax\pgfmath@%
- \xdef\pgfmath@resulttempx{\pgf@sys@tonumber{\pgfmath@x}}%
- \afterassignment\pgfmath@gobbletilpgfmath@%
- \pgfmath@x#2pt\relax\pgfmath@%
- \xdef\pgfmath@resulttempx{\pgf@sys@tonumber{\pgfmath@x}}%
- \gdef\pgfmath@returntwo@{%
- \edef\pgfmathresultx{\pgfmath@resulttempx}%
- \edef\pgfmathresulty{\pgfmath@resulttempy}%
- }%
- \aftergroup\pgfmath@returntwo@}
-
-% \pgfmath@smuggleone
-%
-% Summgle a macro outside a group.
-%
-\def\pgfmath@smuggleone#1{%
- \xdef\pgfmath@smuggleditem{#1}%
- \gdef\pgfmath@@smuggleone{\edef#1{\pgfmath@smuggleditem}}%
- \aftergroup\pgfmath@@smuggleone} \ No newline at end of file