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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.
%D This module deals with some active character handling. Use
%D with care.
\unprotect
%D \macros
%D {installactivecharacter}
\let\m_system_catcodes_temp\empty
\normalprotected\def\installactivecharacter#1 %
{\edef\m_system_catcodes_temp{\detokenize{#1}}%
\c_system_catcodes_c\expandafter`\m_system_catcodes_temp\relax % relax needed
\expandafter\startextendcatcodetable
\expandafter\ctxcatcodes\expandafter\catcode\the\c_system_catcodes_c\activecatcode
\stopextendcatcodetable
\letcatcodecommand \ctxcatcodes \c_system_catcodes_c \m_system_catcodes_temp \relax
\ifnum\currentcatcodetable=\ctxcatcodes \setcatcodetable\ctxcatcodes \fi
\let\m_system_catcodes_temp\empty}
%D \macros
%D {defineactivecharacter}
%D
%D Use this one with care, esp in combination with catcode
%D vectors. There are better ways now.
\setnewconstant\c_system_catcodes_hack\tildeasciicode % also defined in catc-ini.mkiv
\normalprotected\def\defineactivecharacter #1#2 #3% uses \doifnumberelse which is not yet defined
{\c_system_catcodes_c\uccode\c_system_catcodes_hack
\if#1"\uccode\c_system_catcodes_hack\expandafter\doifnumberelse\expandafter{\string#1#2}\empty #1#2\else
\uccode\c_system_catcodes_hack\expandafter\doifnumberelse\expandafter{\string#1#2}\empty`#1#2\fi
\catcode\uccode\c_system_catcodes_hack\activecatcode
\uppercase{\def\m_system_catcodes_temp{~}}% brrr
\uccode\c_system_catcodes_hack\c_system_catcodes_c
\expandafter\expandafter\expandafter\def\expandafter\m_system_catcodes_temp\expandafter
{\expandafter\system_catcodes_handle\m_system_catcodes_temp{#3}}%
\let\m_system_catcodes_temp\empty}
\chardef\activecharactermode\plusone % overloading still backward compatible
\def\system_catcodes_handle
{\ifcase\activecharactermode
\expandafter\system_catcodes_handle_nop
\else
\expandafter\system_catcodes_handle_yes
\fi}
\def\system_catcodes_handle_yes#1#2{#2}
\def\system_catcodes_handle_nop#1#2{\noexpand#1}
\normalprotected\def\makecharacteractive #1 %
{\catcode`#1\activecatcode}
\normalprotected\def\installanddefineactivecharacter #1 % #2%
{\normalexpanded{\noexpand\installactivecharacter \utfchar{#1} }%
\defineactivecharacter #1 }% {#2}}
\protect \endinput
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