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%D \module
%D [ file=catc-act,
%D version=2006.09.18,
%D title=\CONTEXT\ Catcode Macros,
%D subtitle=Default Catcode Tables,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\unprotect
%D \macros
%D {installactivecharacter, defineactivecharacter}
%D
%D This module deals with some active character handling and I still need to
%D update it to use \typ {\letcharcode <number> = \something}. This module
%D will be simplified stepwise. Look into the \MKIV\ variant for originals.
%D
%D There was a time when we had active double quotes and such but we no longer
%D do that. In fact, only the tilde and bar can be active in \CONTEXT.
%D
%D For those who love the more obscure features of \TEX: whenever you see
%D uppercase magic with active characters, keep in mind that this is something
%D deep down in the engine: handling of that specific case. The code here is
%D not used and not really tested.
\permanent\protected\def\installactivecharacter#1 %
{\ifchknum#1\or
\scratchcounter #1\edef\scratchmacro{\expandtoken\othercatcode\scratchcounter}%
\else
\scratchcounter`#1\let \scratchmacro #1%
\fi
\normalexpanded{\startextendcatcodetable\ctxcatcodes\catcode\the\scratchcounter\activecatcode\stopextendcatcodetable}%
\letcatcodecommand \ctxcatcodes \scratchcounter \scratchmacro
\ifnum\currentcatcodetable=\ctxcatcodes \setcatcodetable\ctxcatcodes \fi}
\permanent\protected\def\defineactivecharacter #1 #2%
{\ifchknum#1\or\letcharcode#1=#2\relax\else\letcharcode`#1=#2\relax\fi}
\permanent\protected\def\makecharacteractive #1 %
{\catcode`#1\activecatcode}
\permanent\protected\def\installanddefineactivecharacter #1 #2%
{\normalexpanded{\installactivecharacter \utfchar{#1} }%
\defineactivecharacter #1 #2}
\protect \endinput
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