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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.
\registerctxluafile{catc-ini}{1.001}
%D A long standing wish has been the availability of catcode
%D arrays. Because traditional \TEX\ does not provide this we
%D implement a fake method in the \MKII\ file. There is some
%D overlap in code with \MKII\ but we take that for granted.
\setnewconstant\escapecatcode 0
\setnewconstant\begingroupcatcode 1
\setnewconstant\endgroupcatcode 2
\setnewconstant\mathshiftcatcode 3
\setnewconstant\alignmentcatcode 4
\setnewconstant\endoflinecatcode 5
\setnewconstant\parametercatcode 6
\setnewconstant\superscriptcatcode 7
\setnewconstant\subscriptcatcode 8
\setnewconstant\ignorecatcode 9
\setnewconstant\spacecatcode 10
\setnewconstant\lettercatcode 11
\setnewconstant\othercatcode 12 \let\other \othercatcode
\setnewconstant\activecatcode 13 \let\active\activecatcode
\setnewconstant\commentcatcode 14
\setnewconstant\invalidcatcode 15
\setnewconstant\tabasciicode 9
\setnewconstant\newlineasciicode 10 % don't confuse this one with \endoflineasciicode
\setnewconstant\formfeedasciicode 12
\setnewconstant\endoflineasciicode 13 % somewhat messy but this can be the active \par
\setnewconstant\endoffileasciicode 26
\setnewconstant\spaceasciicode 32
\setnewconstant\hashasciicode 35
\setnewconstant\dollarasciicode 36
\setnewconstant\commentasciicode 37
\setnewconstant\ampersandasciicode 38
\setnewconstant\backslashasciicode 92 % `\\
\setnewconstant\circumflexasciicode 94
\setnewconstant\underscoreasciicode 95
\setnewconstant\leftbraceasciicode 123 % `\{
\setnewconstant\barasciicode 124 % `\|
\setnewconstant\rightbraceasciicode 125 % `\}
\setnewconstant\tildeasciicode 126 % `\~
\setnewconstant\delasciicode 127
\bgroup
\catcode \tabasciicode \activecatcode \gdef\activetabtoken {^^I}
\gdef\outputnewlinechar {^^J}
\catcode \formfeedasciicode \activecatcode \gdef\activeformfeedtoken {^^L}
\catcode \endoflineasciicode \activecatcode \gdef\activeendoflinetoken{^^M}
\egroup
% \endlinechar = \endoflineasciicode % appended to input lines
% \newlinechar = \newlineasciicode % can be used in write
% rather special and used in writing to file: \let\par\outputnewlinechar
\def\initializenewlinechar % operating system dependent
{\bgroup
\newlinechar\newlineasciicode
\xdef\outputnewlinechar{^^J}%
\egroup}
\ifx\gobbleoneargument\undefined \long\def\gobbleoneargument#1{} \fi
\newif \ifrecatcodeuppercharacters % only used in good old tex
\newcount\cctdefcounter \cctdefcounter\zerocount % 0 = signal, so advance before allocate
\newcount\cctcountera
\newcount\cctcounterb
\newcount\cctcounterc
\def\newcatcodetable#1%
{\global\advance\cctdefcounter\plusone
\expandafter\xdef\csname @@ccn:\number\cctdefcounter\endcsname{\string#1}% logging
\newconstant#1%
#1\cctdefcounter
\ctxlua{catcodes.register("\expandafter\gobbleoneargument\string#1",\number#1)}}
\newcatcodetable \scratchcatcodes \initcatcodetable\scratchcatcodes
\newtoks \setdefaultcatcodes
\setdefaultcatcodes
{\catcode\backslashasciicode\othercatcode
\catcode\endoflineasciicode\othercatcode
\catcode\spaceasciicode \othercatcode
\catcode\commentasciicode \othercatcode
\catcode\delasciicode \othercatcode}
\long\normalprotected\def\startcatcodetable#1#2\stopcatcodetable
{\bgroup
\catcodetable\scratchcatcodes
\the\setdefaultcatcodes
#2%
\savecatcodetable#1\relax
\egroup}
\def\permitcircumflexescape % to be used grouped
{\catcode\circumflexasciicode\superscriptcatcode}
\let\permitcaretescape\permitcircumflexescape
\newcatcodetable\dummycatcodes
\long\normalprotected\def\startextendcatcodetable#1#2\stopextendcatcodetable
{\bgroup
\catcodetable#1\relax
\globaldefs\plusone
#2%
\globaldefs\zerocount
\egroup}
% ==
%
% \long\normalprotected\def\startextendcatcodetable#1#2\stopextendcatcodetable
% {\bgroup
% \scratchcounter\the\catcodetable
% \catcodetable #1 #2
% \catcodetable\scratchcounter
% \egroup}
\def\letcatcodecommand
{\afterassignment\letcatcodecommanda\cctcountera}
\def\letcatcodecommanda
{\afterassignment\letcatcodecommandb\cctcounterb}
\let\currentcatcodetable\catcodetable
%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. Do we still need this complex
%D mechanism? Future versions of \MKIV\ might only use
%D active characters for very special cases.
\setnewconstant\activehackcode \tildeasciicode
%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}%
\reinstatecatcodecommandua % unexpanded
\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 (we could use \normalexpanded here)
{\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}
% unexpandable 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\normalprotected\expandafter\def\csname CCC:\number\cctcountera:\number\cctcounterb\endcsname{##1}}%
\reinstatecatcodecommandua % unexpanded
\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}
\def\reinstatecatcodecommandua % 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{\normalprotected\xdef~{\noexpand\catcodecommand{\number\cctcounterb}}}%
\egroup}
\newconstant\defaultcatcodetable
\def\catcodecommand#1%
{\csname CCC:\number
\ifcsname CCC:\number\currentcatcodetable:\number#1\endcsname
\currentcatcodetable \else \defaultcatcodetable
\fi
:\number#1\endcsname}
%D \macros
%D {restorecatcodes,pushcatcodetable,popcatcodetable}
%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}.
% quite likely we will define \unexpanded earlier on so
% that \normalprotected will go
\let\savedcatcodetable\relax
\newcount\catcoderestorelevel
\normalprotected\def\pushcatcodetable
{\advance\catcoderestorelevel\plusone
\tracepushcatcodetable
\expandafter\chardef\csname scct:\number\catcoderestorelevel\endcsname\currentcatcodetable}
\normalprotected\def\popcatcodetable
{\ifcase\catcoderestorelevel
\showcatcodenestingerror
\else
\expandafter\catcodetable\csname scct:\number\catcoderestorelevel\endcsname
\tracepopcatcodetable
\advance\catcoderestorelevel\minusone
\fi}
\normalprotected\def\showcatcodenestingerror % can be overloaded
{\immediate\write16{}%
\immediate\write16{Fatal error: catcode push/pop mismatch. Fix this!}\wait\end
\immediate\write16{}}
\normalprotected\def\restorecatcodes % takes previous level
{\ifnum\catcoderestorelevel>\plusone
\expandafter\catcodetable\csname scct:\number\numexpr\catcoderestorelevel-1\relax\endcsname
\fi}
\newtoks\everycatcodetable
\normalprotected\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
%D Handy for debugging:
% \tracecatcodetables
% D Only in \MKIV\ (to be used when crossing pages with changed catcodes
% D in the current vector):
% D
% D \starttyping
% D \normalprotected\def\startcrap
% D {\bgroup
% D \pushcatcodes
% D \whitespace
% D \obeylines
% D \activatespacehandler\v!yes
% D \strut}
% D
% D \normalprotected\def\stopcrap
% D {\popcatcodes
% D \egroup}
% D \stoptyping
%
% \newcount\catcodetablelevel
%
% \def\pushcatcodes
% {\bgroup
% \global\advance\catcodetablelevel\plusone
% \ifcsname @@ccf:\number\catcodetablelevel\endcsname \else
% \global\advance\cctdefcounter\plusone
% \expandafter\global\expandafter\chardef\csname @@ccf:\number\catcodetablelevel\endcsname\cctdefcounter
% \fi
% \catcodetable\ctxcatcodes
% \expandafter\savecatcodetable\csname @@ccf:\number\catcodetablelevel\endcsname
% \egroup
% \expandafter\catcodetable\csname @@ccf:\number\catcodetablelevel\endcsname}
%
% \def\popcatcodes
% {\global\advance\catcodetablelevel\minusone}
\endinput
|
