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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 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 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}
\unprotect
%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 % finally obsolete: \let\other \othercatcode
\setnewconstant\activecatcode 13 % finally obsolete: \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\exclamationmarkasciicode 33 % ! used in namespace protection
\setnewconstant\doublequoteasciicode 34 % "
\setnewconstant\hashasciicode 35
\setnewconstant\dollarasciicode 36
\setnewconstant\commentasciicode 37
\setnewconstant\ampersandasciicode 38
\setnewconstant\singlequoteasciicode 39 % '
\setnewconstant\primeasciicode 39 % '
\setnewconstant\hyphenasciicode 45
\setnewconstant\forwardslashasciicode 47 % /
\setnewconstant\colonasciicode 58
\setnewconstant\lessthanasciicode 60 % < used as alternative verbatim {
\setnewconstant\morethanasciicode 62 % > used as alternative verbatim }
\setnewconstant\questionmarkasciicode 63 % ? used in namespace protection
\setnewconstant\atsignasciicode 64 % @ used in namespace protection
\setnewconstant\backslashasciicode 92 % `\\
\setnewconstant\circumflexasciicode 94
\setnewconstant\underscoreasciicode 95
\setnewconstant\leftbraceasciicode 123 % `\{
\setnewconstant\barasciicode 124 % `\|
\setnewconstant\rightbraceasciicode 125 % `\}
\setnewconstant\tildeasciicode 126 % `\~
\setnewconstant\delasciicode 127
\begingroup
\catcode \tabasciicode \activecatcode \gdef\activetabtoken {^^I}
\gdef\outputnewlinechar {^^J}
\catcode \formfeedasciicode \activecatcode \gdef\activeformfeedtoken {^^L}
\catcode \endoflineasciicode \activecatcode \gdef\activeendoflinetoken{^^M}
\endgroup
% \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
{\begingroup
\newlinechar\newlineasciicode
\xdef\outputnewlinechar{^^J}%
\endgroup}
%D We predefine some prefixes ahead of syst-aux and mult-sys.
% We reserve 8 slots for catcodes.
%
% \def\??catcodelet {1>>} % let : \let
% \def\??catcodedef {2>>} % def : \def
% \def\??catcodeued {3>>} % ued : \unexpanded\def
% \def\??catcodeget {4>>} % \meaning
%
% \def\??catcodetablet{5>>}
% \def\??catcodetablen{6>>}
\installsystemnamespace {catcodelet} % let : \let
\installsystemnamespace {catcodedef} % def : \def
\installsystemnamespace {catcodeued} % ued : \unexpanded\def
\installsystemnamespace {catcodeget} % \meaning
\installsystemnamespace {catcodetablet}
\installsystemnamespace {catcodetablen}
\newcount\c_syst_catcodes_n \c_syst_catcodes_n\zerocount % 0 = signal, so advance before allocate
\newcount\c_syst_catcodes_a
\newcount\c_syst_catcodes_b
\newcount\c_syst_catcodes_c
\normalprotected\def\newcatcodetable#1% we could move the cctdefcounter to lua
{\global\advance\c_syst_catcodes_n\plusone
\expandafter\xdef\csname\??catcodetablen\number\c_syst_catcodes_n\endcsname{\string#1}% logging
\newconstant#1%
#1\c_syst_catcodes_n
\ctxcommand{registercatcodetable("\expandafter\gobbleoneargument\string#1",\number#1)}}
\newtoks \everysetdefaultcatcodes
\everysetdefaultcatcodes % this might get dropped
{\catcode\backslashasciicode\othercatcode
\catcode\endoflineasciicode\othercatcode
\catcode\spaceasciicode \othercatcode
\catcode\commentasciicode \othercatcode
\catcode\delasciicode \othercatcode}
\normalprotected\def\startcatcodetable#1#2\stopcatcodetable
{\begingroup
\catcodetable\inicatcodes
\the\everysetdefaultcatcodes
#2%
\savecatcodetable#1\relax
\endgroup}
\let\stopcatcodetable\relax
\normalprotected\def\startextendcatcodetable#1#2\stopextendcatcodetable
{\begingroup
\catcodetable#1\relax
\globaldefs\plusone
#2%
\globaldefs\zerocount
\endgroup}
\let\stopextendcatcodetable\relax
\normalprotected\def\permitcircumflexescape % to be used grouped
{\catcode\circumflexasciicode\superscriptcatcode}
\let\permitcaretescape\permitcircumflexescape
% ==
%
% \normalprotected\def\startextendcatcodetable#1#2\stopextendcatcodetable
% {\bgroup
% \scratchcounter\the\catcodetable
% \catcodetable #1 #2
% \catcodetable\scratchcounter
% \egroup}
%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\c_syst_catcodes_hack\tildeasciicode
%D Once a catcode is assigned, the next assignments will happen
%D faster.
\def\letcatcodecommand{\afterassignment\syst_catcodes_let_a\c_syst_catcodes_a}
\def\defcatcodecommand{\afterassignment\syst_catcodes_def_a\c_syst_catcodes_a}
\def\uedcatcodecommand{\afterassignment\syst_catcodes_ued_a\c_syst_catcodes_a}
\def\syst_catcodes_let_a{\afterassignment\syst_catcodes_let_b\c_syst_catcodes_b}
\def\syst_catcodes_def_a{\afterassignment\syst_catcodes_def_b\c_syst_catcodes_b}
\def\syst_catcodes_ued_a{\afterassignment\syst_catcodes_ued_b\c_syst_catcodes_b}
\def\syst_catcodes_let_b % each time
{\ifcsname\??catcodelet\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname
\csname\??catcodelet\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
\else
\expandafter\syst_catcodes_let_c
\fi}
\def\syst_catcodes_def_b % each time
{\ifcsname\??catcodedef\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname
\csname\??catcodedef\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
\else
\expandafter\syst_catcodes_def_c
\fi}
\def\syst_catcodes_ued_b % each time
{\ifcsname\??catcodeued\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname
\csname\??catcodeued\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
\else
\expandafter\syst_catcodes_ued_c
\fi}
\def\syst_catcodes_let_c % only first time
{\expandafter\gdef\csname\??catcodelet\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname\expandafter
{\expandafter\let\csname\??catcodeget\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname}%
\syst_catcodes_reinstate_unexpanded
\csname\??catcodelet\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname}
\def\syst_catcodes_def_c % only first time (we could use \normalexpanded here)
{\expandafter\gdef\csname\??catcodedef\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
\expandafter##\expandafter1\expandafter
{\expandafter\def\csname\??catcodeget\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname{##1}}%
\syst_catcodes_reinstate_normal
\csname\??catcodedef\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname}
\def\syst_catcodes_ued_c % only first time
{\expandafter\gdef\csname\??catcodeued\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
\expandafter##\expandafter1\expandafter
{\expandafter\normalprotected\expandafter\def\csname\??catcodeget\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname{##1}}%
\syst_catcodes_reinstate_unexpanded
\csname\??catcodeued\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\endcsname}
\def\reinstatecatcodecommand{\afterassignment\syst_catcodes_reinstate_normal\c_syst_catcodes_b}
\def\syst_catcodes_reinstate_normal % can be used when a direct definition has been done
{\begingroup % and the selector has been lost
\uccode\c_syst_catcodes_hack\c_syst_catcodes_b
\catcode\uccode\c_syst_catcodes_hack\activecatcode
\uppercase{\xdef~{\noexpand\catcodecommand{\number\c_syst_catcodes_b}}}%
\endgroup}
\def\syst_catcodes_reinstate_unexpanded % can be used when a direct definition has been done
{\begingroup % and the selector has been lost
\uccode\c_syst_catcodes_hack\c_syst_catcodes_b
\catcode\uccode\c_syst_catcodes_hack\activecatcode
\uppercase{\normalprotected\xdef~{\noexpand\catcodecommand{\number\c_syst_catcodes_b}}}%
\endgroup}
\newconstant\defaultcatcodetable
\def\catcodecommand#1%
{\csname\??catcodeget\number
\ifcsname\??catcodeget\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}.
\newcount\c_syst_catcodes_level
\normalprotected\def\pushcatcodetable
{\advance\c_syst_catcodes_level\plusone
\syst_catcodes_trace_push
\expandafter\chardef\csname\??catcodetablet\number\c_syst_catcodes_level\endcsname\currentcatcodetable}
\normalprotected\def\popcatcodetable
{\ifcase\c_syst_catcodes_level
\syst_catcodes_trace_nesting_error
\else
\expandafter\catcodetable\csname\??catcodetablet\number\c_syst_catcodes_level\endcsname
\syst_catcodes_trace_pop
\advance\c_syst_catcodes_level\minusone
\fi}
\normalprotected\def\syst_catcodes_trace_nesting_error
{\immediate\write16{}%
\immediate\write16{Fatal error: catcode push/pop mismatch. Fix this! (restore level: \number\c_syst_catcodes_level)}\wait\end
\immediate\write16{}}
\normalprotected\def\restorecatcodes % takes previous level
{\ifnum\c_syst_catcodes_level>\plusone
\expandafter\catcodetable\csname\??catcodetablet\number\numexpr\c_syst_catcodes_level-1\relax\endcsname
\fi}
% \newtoks\everycatcodetable
\normalprotected\def\setcatcodetable#1%
{\catcodetable#1%
% \the\everycatcodetable
\syst_catcodes_trace_set}
%D Handy for debugging:
%D
%D \starttyping
%D \tracecatcodetables
%D \stoptyping
\normalprotected\def\tracecatcodetables
{\def\syst_catcodes_trace_set {\syst_catcodes_trace{set \catcodetablename\space at \number\c_syst_catcodes_level}}%
\def\syst_catcodes_trace_push{\syst_catcodes_trace{push \catcodetablename\space from \syst_catcodes_prev\space at \number\c_syst_catcodes_level}}%
\def\syst_catcodes_trace_pop {\syst_catcodes_trace{pop \catcodetablename\space to \syst_catcodes_prev\space at \number\c_syst_catcodes_level}}}
\def\syst_catcodes_trace#1{\immediate\write16{[#1]}}
\def\syst_catcodes_prev
{\ifnum\numexpr\c_syst_catcodes_level-1\relax>\zerocount
\csname\??catcodetablen\number\csname\??catcodetablet\number\numexpr\c_syst_catcodes_level-1\relax\endcsname\endcsname
\else
-%
\fi}
\def\catcodetablename
{\ifnum\currentcatcodetable>\zerocount
\csname\??catcodetablen\number\currentcatcodetable\endcsname
\else
-%
\fi}
\let\syst_catcodes_trace_set \empty
\let\syst_catcodes_trace_push\empty
\let\syst_catcodes_trace_pop \empty
% \tracecatcodetables
\protect
%D We still have to define these so let's do that now:
\newcatcodetable \inicatcodes
\initcatcodetable\inicatcodes
\let\currentcatcodetable\catcodetable
\endinput
|
