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%D \module
%D [ file=catc-ini,
%D version=2006.09.18,
%D title=\CONTEXT\ System Macros,
%D subtitle=Catcode Handling,
%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've split the functionality of syst-cat.* over more files
%D now so that we can load more selectively.
%D A long standing wish has been the availability of catcode
%D arrays. Because traditional \TEX\ does ot provide this we
%D implement a fake method in the Mark II file.
\ifx\zerocount\undefined \chardef \zerocount= 0 \fi
\ifx\plusone \undefined \chardef \plusone = 1 \fi
\ifx\minusone \undefined \newcount\minusone \minusone =-1 \fi
\chardef\escapecatcode = 0
\chardef\begingroupcatcode = 1
\chardef\endgroupcatcode = 2
\chardef\mathshiftcatcode = 3
\chardef\alignmentcatcode = 4
\chardef\endoflinecatcode = 5
\chardef\parametercatcode = 6
\chardef\superscriptcatcode = 7
\chardef\subscriptcatcode = 8
\chardef\ignorecatcode = 9
\chardef\spacecatcode = 10
\chardef\lettercatcode = 11
\chardef\othercatcode = 12 \chardef\other = 12
\chardef\activecatcode = 13 \chardef\active = 13
\chardef\commentcatcode = 14
\newif \ifrecatcodeuppercharacters % only used in good old tex
% \newcount\cctdefcounter \cctdefcounter\plusone % 0 = signal
\newcount\cctdefcounter \cctdefcounter\zerocount % 0 = signal, so advance before allocate
\newcount\cctcountera
\newcount\cctcounterb
\newcount\cctcounterc
\def\newcatcodetable#1%
{\global\advance\cctdefcounter\plusone
\global\mathchardef#1\cctdefcounter
\expandafter\xdef\csname @@ccn:\number\cctdefcounter\endcsname{\string#1}% logging
\expandafter\newtoks\csname @@cct:\number\cctdefcounter\endcsname}
\mathchardef\currentcatcodetable\zerocount
\newtoks \setdefaultlowercatcodes
\newtoks \setdefaultuppercatcodes
\def\next#1% we don't have a proper loop defined yet
{\edef\nextnext{#1{\the#1\catcode\the\cctcountera\space
\ifnum\catcode\cctcountera=\lettercatcode \lettercatcode\else\othercatcode\fi}}%
\nextnext\ifnum\cctcountera<\cctcounterb \advance\cctcountera\plusone \expandafter\next\expandafter#1\fi}
\cctcountera 0 \cctcounterb 127 \next\setdefaultlowercatcodes
\cctcountera 128 \cctcounterb 255 \next\setdefaultuppercatcodes
\recatcodeuppercharactersfalse
\def\catcodetable#1%
{\mathchardef\currentcatcodetable#1%
\the\setdefaultlowercatcodes
\ifrecatcodeuppercharacters\the\setdefaultuppercatcodes\fi
\the\csname @@cct:\number#1\endcsname}
\long\def\startcatcodetable#1#2\stopcatcodetable
{\global\csname @@cct:\number#1\endcsname{#2}}
\long\def\startextendcatcodetable#1#2\stopextendcatcodetable
{\global\csname @@cct:\number#1\endcsname\expandafter{\the\csname @@cct:\number#1\endcsname#2}}
%D The next command can be defined in a cleaner way in the
%D Mk IV file but we want to have a fast one with a minimal
%D chance for interference.
\chardef\activehackcode=`\~
%D Once a catcode is assigned, the next assignments will happen faster.
% (expandable) let
\def\letcatcodecommand {\afterassignment\letcatcodecommanda\cctcountera}
\def\letcatcodecommanda{\afterassignment\letcatcodecommandb\cctcounterb}
\def\letcatcodecommandb % each time
{\ifcsname CCL:\number\cctcountera:\number\cctcounterb\endcsname
\csname CCL:\number\cctcountera:\number\cctcounterb\expandafter\endcsname
\else
\expandafter\letcatcodecommandc
\fi}
\def\letcatcodecommandc % only first time
{\expandafter\gdef\csname CCL:\number\cctcountera:\number\cctcounterb\expandafter\endcsname\expandafter
{\expandafter\let\csname CCC:\number\cctcountera:\number\cctcounterb\endcsname}%
\reinstatecatcodecommanda
\csname CCL:\number\cctcountera:\number\cctcounterb\endcsname}
% expandable def
\def\defcatcodecommand {\afterassignment\defcatcodecommanda\cctcountera}
\def\defcatcodecommanda{\afterassignment\defcatcodecommandb\cctcounterb}
\def\defcatcodecommandb % each time
{\ifcsname CCD:\number\cctcountera:\number\cctcounterb\endcsname
\csname CCD:\number\cctcountera:\number\cctcounterb\expandafter\endcsname
\else
\expandafter\defcatcodecommandc
\fi}
\def\defcatcodecommandc % only first time
{\expandafter\gdef\csname CCD:\number\cctcountera:\number\cctcounterb\expandafter\endcsname
\expandafter##\expandafter1\expandafter
{\expandafter\def\csname CCC:\number\cctcountera:\number\cctcounterb\endcsname{##1}}%
\reinstatecatcodecommanda
\csname CCD:\number\cctcountera:\number\cctcounterb\endcsname}
% un expandable def (e.g. used for discretionaries)
\def\uedcatcodecommand {\afterassignment\uedcatcodecommanda\cctcountera}
\def\uedcatcodecommanda{\afterassignment\uedcatcodecommandb\cctcounterb}
\def\uedcatcodecommandb % each time
{\ifcsname CCU:\number\cctcountera:\number\cctcounterb\endcsname
\csname CCU:\number\cctcountera:\number\cctcounterb\expandafter\endcsname
\else
\expandafter\uedcatcodecommandc
\fi}
\def\uedcatcodecommandc % only first time
{\expandafter\gdef\csname CCU:\number\cctcountera:\number\cctcounterb\expandafter\endcsname
\expandafter##\expandafter1\expandafter
{\expandafter\unexpanded\expandafter\def\csname CCC:\number\cctcountera:\number\cctcounterb\endcsname{##1}}%
\reinstatecatcodecommanda
\csname CCU:\number\cctcountera:\number\cctcounterb\endcsname}
\def\reinstatecatcodecommand{\afterassignment\reinstatecatcodecommanda\cctcounterb}
\def\reinstatecatcodecommanda % can be used when a direct definition has been done
{\bgroup % and the selector has been lost
\uccode\activehackcode\cctcounterb
\catcode\uccode\activehackcode\activecatcode
\uppercase{\xdef~{\noexpand\catcodecommand{\number\cctcounterb}}}%
\egroup}
\chardef\defaultcatcodetable\zerocount
\def\catcodecommand#1%
{\csname CCC:\number
\ifcsname CCC:\number\currentcatcodetable:\number#1\endcsname
\currentcatcodetable \else \defaultcatcodetable
\fi
:\number#1\endcsname}
%D \macros
%D {restorecatcodes,
%D beginrestorecatcodes,endrestorecatcodes}
%D
%D We're not finished dealing \CATCODES\ yet. In \CONTEXT\ we
%D use only one auxiliary file, which deals with tables of
%D contents, registers, two pass tracking, references etc. This
%D file, as well as files concerning graphics, is processed when
%D needed, which can be in the mid of typesetting verbatim.
%D However, when reading in data in verbatim mode, we should
%D temporary restore the normal \CATCODES, and that's exactly
%D what the next macros do. Saving the catcodes can be
%D disabled by saying \type{\localcatcodestrue}.
\let\savedcatcodetable\relax
\newcount\catcoderestorelevel
\def\pushcatcodetable
{\advance\catcoderestorelevel\plusone
\tracepushcatcodetable
\expandafter\mathchardef\csname scct:\number\catcoderestorelevel\endcsname\currentcatcodetable}
\def\popcatcodetable
{\ifcase\catcoderestorelevel
\showcatcodenestingerror
\else
\expandafter\catcodetable\csname scct:\number\catcoderestorelevel\endcsname
\tracepopcatcodetable
\advance\catcoderestorelevel\minusone
\fi}
\def\showcatcodenestingerror % can be overloaded
{\immediate\write16{}%
\immediate\write16{Fatal error: catcode push/pop mismatch. Fix this!}\wait\end
\immediate\write16{}}
\def\restorecatcodes % takes previous level
{\ifnum\catcoderestorelevel>\plusone
\expandafter\catcodetable\csname scct:\number\numexpr\catcoderestorelevel-1\relax\endcsname
\fi}
\newtoks\everycatcodetable
\def\setcatcodetable#1%
{\catcodetable#1%
\the\everycatcodetable
\tracesetcatcodetable}
\def\dotracecatcodetable#1{\immediate\write16{[#1]}}
\def\tracecatcodetables
{\def\tracesetcatcodetable {\dotracecatcodetable{set \catcodetablename\space at \number\catcoderestorelevel}}%
\def\tracepushcatcodetable{\dotracecatcodetable{push \catcodetablename\space from \catcodetableprev\space at \number\catcoderestorelevel}}%
\def\tracepopcatcodetable {\dotracecatcodetable{pop \catcodetablename\space to \catcodetableprev\space at \number\catcoderestorelevel}}}
\def\catcodetableprev
{\ifnum\numexpr\catcoderestorelevel-1\relax>\zerocount
\csname @@ccn:\number\csname scct:\number\numexpr\catcoderestorelevel-1\relax\endcsname\endcsname
\else
-%
\fi}
\def\catcodetablename
{\ifnum\currentcatcodetable>\zerocount
\csname @@ccn:\number\currentcatcodetable\endcsname
\else
-%
\fi}
\ifx\empty\undefined \def\empty{} \fi
\let\tracesetcatcodetable \empty
\let\tracepushcatcodetable\empty
\let\tracepopcatcodetable \empty
\def\beginrestorecatcodes{\pushcatcodetable}
\def\endrestorecatcodes {\popcatcodetable}
%D Handy for debugging:
% \tracecatcodetables
\endinput
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