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%D \module
%D [ filefile=colo-hex,
%D version=2004.06.23,
%D title=\CONTEXT\ Color Macros,
%D subtitle=Hex Colors,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\ifx\dodododefinecolor\undefined
\beginTEX \endinput \endTEX
\else
\endinput
\fi
\writestatus{loading}{Context Color Macros / hexadecimal}
% \edef\testcolor{\string#FFC0C0}
% \edef\testcolor{\string#55}
%
% \setupcolors[state=start]
%
% \expanded{\definecolor[thehexcolor][\hexcolorspec\testcolor]}
%
% \checkhexcolor[\testcolor]
%
% \definecolor[thehexcolor][\testcolor]
%
% \starttext
%
% test \color[thehexcolor]{rood}
% test \color[red]{rood}
% test \color[\testcolor]{rood}
%
% \stoptext
\unprotect
\newdimen\hexcolorfraction \hexcolorfraction=\dimexpr(1pt/256)
\chardef\hexcolorprefix=`#
\def\hexcolorspec #1{\expandafter\dohexcolorspec #1\empty\empty\empty\empty\relax}
\def\hexcolorpattern#1{\expandafter\dohexcolorpattern#1\empty\empty\empty\empty\relax}
\ifx\dohexstringtonumber\undefined \def\dohexstringtonumber{"} \fi
\def\hexcolorcomponent#1#2%
{\ifnum\dohexstringtonumber#1#2=\zerocount0\else\ifnum\dohexstringtonumber#1#2=\plusone1\else
\expandafter\withoutpt\the\dimexpr(\dohexstringtonumber#1#2\hexcolorfraction)%
\fi\fi}
\def\dohexcolorspec#1#2#3#4#5#6#7#8\relax
{\ifx#4\empty
s=\hexcolorcomponent#2#3%
\else
r=\hexcolorcomponent#2#3,g=\hexcolorcomponent#4#5,b=\hexcolorcomponent#6#7%
\fi}
\def\dohexcolorpattern#1#2#3#4#5#6#7#8\relax
{0\ifx#4\empty
S:\hexcolorcomponent#2#3%
\else
R:\hexcolorcomponent#2#3:\hexcolorcomponent#4#5:\hexcolorcomponent#6#7%
\fi:0:0}
\def\doifhexcolorelse#1%
{\expandafter\dodoifhexcolorelse#10\od} % 0 is a dirty trick to catch an empty #1
\def\dodoifhexcolorelse#1#2\od
{\ifnum`#1=\hexcolorprefix
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\def\docheckhexcolor#1%
{\doifhexcolorelse{#1}{\doifundefined{#1}{\setxvalue{\??cr#1}{\hexcolorpattern{#1}}}}\donothing}
\def\checkhexcolor[#1]%
{\expanded{\docheckhexcolor{#1}}}
\def\colorHpattern{\@EA\hexcolorpattern\@EA{\@EA*\@@cl@@h}} % * == dummy placeholder
\let\dodododefinecolor\dododefinecolor % we will overload this one
\def\dododefinecolor#1#2#3#4[#5][#6]%
{\doifhexcolorelse{#6}
{\setxvalue{\??cr#5}{\hexcolorpattern{#6}}}
{\dodododefinecolor#1#2#3#4[#5][#6]}}
\protect \endinput
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