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%D \module
%D [ file=xetx-ini,
%D version=2004.09.11,
%D title=\CONTEXT\ System Macros,
%D subtitle=\XETEX\ Initializations,
%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.
%D We moved some code around and now have reorganized the xetex
%D code in the \type {xetx} module namespace.
\unprotect
%D Some defaults.
\ifdefined\XeTeXuseglyphmetrics
\XeTeXuseglyphmetrics\plusone
\fi
%D Character classes.
\newcount\nofXTXcharinjections
\def\defineXTXcharinjectionclass[#1]%
{\global\advance\nofXTXcharinjections\plusone
\setxvalue{@xtx@cc@#1}{\number\nofXTXcharinjections}}
\setxvalue{@xtx@cc@\s!default}{0}
\def\getXTXcharinjectionclass#1%
{\csname @xtx@cc@\ifcsname @xtx@cc@#1\endcsname#1\else\s!default\fi\endcsname}
\let\currentXTXcharinjection\s!default
\def\startXTXcharinjecxtions[#1]%
{\pushmacro\currentXTXcharinjection
\def\currentXTXcharinjection{#1}}
\def\stopXTXcharinjections
{\popmacro\currentXTXcharinjection}
\def\defineXTXcharinjection #1 #2 %
{\doifnumberelse{#1}{\edef\XTXclassone{\number#1}}{\edef\XTXclassone{\getXTXcharinjectionclas{#1}}}%
\doifnumberelse{#2}{\edef\XTXclasstwo{\number#2}}{\edef\XTXclasstwo{\getXTXcharinjectionclas{#2}}}%
\expanded{\dodefineXTXcharinjection{\XTXclassone}{\XTXclasstwo}}}
\def\setXTXcharcodes #1 #2 #3 % encoding syntax
{\catcode#1=11 \lccode #1=#2 \uccode #1=#3 }
\def\dosetXTXcharcodes#1#2#3% compact syntax
{\catcode#1=11 \lccode #1=#2 \uccode #1=#3 }
\ifdefined\XeTeXinterchartoks
\long\def\dodefineXTXcharinjection#1#2#3%
{\XeTeXinterchartoks #1 #2 {\XTXcharinjection{#1}{#2}}%
\setvalue{@xtx@ch@\currentXTXcharinjection @#1@#2@}{#3}}
\def\setXTXcharacterclass #1 #2 %
{\doifnumberelse{#2}
{\XeTeXcharclass#1=#2\relax}
{\XeTeXcharclass#1=\getXTXcharinjectionclass{#2}\relax}}
\def\dosetXTXcharacterclass#1% #2 fast one
{\XeTeXcharclass#1=\getXTXcharinjectionclass}
\else
\long\def\dodefineXTXcharinjection#1#2#3%
{\setvalue{@xtx@ch@\currentXTXcharinjection @#1@#2@}{#3}}
\def\setXTXcharacterclass #1 #2 %
{}
\fi
\chardef\XTXcharinjectionsmode=1
\letvalue{@xtx@ch@\s!empty}\empty
\def\XTXcharinjection#1#2%
{\csname @xtx@ch@%
\ifcase\XTXcharinjectionsmode
\s!empty
\or
\ifcsname @xtx@ch@\currentXTXcharinjection @#1@#2@\endcsname \currentXTXcharinjection @#1@#2@\fi
\or
\ifcsname @xtx@ch@\currentXTXcharinjection @#1@#2@\endcsname \currentXTXcharinjection @#1@#2@\else
\ifcsname @xtx@ch@\s!default @#1@#2@\endcsname \s!default @#1@#2@\else
\s!empty
\fi\fi
\else
\s!empty
\fi
\endcsname}
\def\enableXTXcharinjections[#1]%
{\def\currentXTXcharinjection{#1}}
\protect \endinput
\starttext
\startXTXcharinjecxtions[default]
\defineXTXcharinjection 10 40 {[default]}
\stopXTXcharinjections
\startXTXcharinjecxtions[whatever]
\defineXTXcharinjection 20 40 {[whatever]}
\stopXTXcharinjections
\chardef\XTXcharinjectionsmode=0
\enableXTXcharinjections[default] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\enableXTXcharinjections[whatever] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\chardef\XTXcharinjectionsmode=1
\enableXTXcharinjections[default] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\enableXTXcharinjections[whatever] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\chardef\XTXcharinjectionsmode=2
\enableXTXcharinjections[default] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\enableXTXcharinjections[whatever] A\XTXcharinjection{10}{40}B\XTXcharinjection{20}{40}C
\stoptext
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