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authorKarl Berry <karl@freefriends.org>2021-03-06 21:58:15 +0000
committerKarl Berry <karl@freefriends.org>2021-03-06 21:58:15 +0000
commit974640d66e61e81cb197ad96fdff7b08343e4c5a (patch)
tree2e1f75f32f312b7f24ba82b4590ae230bcd6f399 /Master/texmf-dist/tex/context/base/mkxl/catc-ini.mkxl
parentb4fa72e61230aca75f7f6fbf988821f71edfb6b2 (diff)
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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.
+
+\registerctxluafile{catc-ini}{autosuffix}
+
+\unprotect
+
+%D A long standing wish has been the availability of catcode arrays. Because
+%D traditional \TEX\ does not provide this we implement a fake method in the \MKII\
+%D file. There is some overlap in code with \MKII\ but we take that for granted.
+%D Also, in \MKIV\ less active characters are used.
+
+% \begingroup
+% \letcharcode\newlineasciicode\relax \xdef\outputnewlinechar{\Uchar\newlineasciicode}
+% \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
+
+% \permanent\protected\def\initializenewlinechar % operating system dependent
+% {\begingroup
+% \enforced\letcharcode\newlineasciicode\relax
+% \newlinechar\newlineasciicode
+% \xdef\outputnewlinechar{\Uchar\newlineasciicode}%
+% \endgroup}
+
+%D We predefine some prefixes ahead of syst-aux and mult-sys. We reserve 8 slots for
+%D catcodes. (This active mess probably needs an update some day.)
+
+\installsystemnamespace{catcodelet} % let : \let
+\installsystemnamespace{catcodedef} % def : \def
+\installsystemnamespace{catcodeued} % ued : \protected\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
+
+\permanent\protected\def\newcatcodetable#1% we could move the cctdefcounter to lua
+ {\global\advance\c_syst_catcodes_n\plusone
+ \gdefcsname\??catcodetablen\number\c_syst_catcodes_n\endcsname{\string#1}% logging
+ \immutable\integerdef#1\c_syst_catcodes_n
+ \ctxlua{catcodes.register("\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}
+
+\permanent\protected\def\startcatcodetable#1#2\stopcatcodetable
+ {\begingroup
+ \catcodetable\inicatcodes
+ \the\everysetdefaultcatcodes
+ #2%
+ \savecatcodetable#1\relax
+ \endgroup}
+
+\permanent\let\stopcatcodetable\relax
+
+\permanent\protected\def\startextendcatcodetable#1#2\stopextendcatcodetable
+ {\begingroup
+ \catcodetable#1\relax
+ \globaldefs\plusone
+ #2%
+ \globaldefs\zerocount
+ \endgroup}
+
+\permanent\let\stopextendcatcodetable\relax
+
+\permanent\protected\def\permitcircumflexescape % to be used grouped
+ {\catcode\circumflexasciicode\superscriptcatcode}
+
+\aliased\let\permitcaretescape\permitcircumflexescape
+
+% ==
+%
+% \protected\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 MkIV way but we want
+%D to have a fast one with a minimal chance for interference. Do we still need
+%D this complex mechanism? Probably not. 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 faster. However,
+%D redefinitions probably happen seldom so it's sort of overkill.
+
+\permanent\protected\def\letcatcodecommand{\afterassignment\syst_catcodes_let_a\c_syst_catcodes_a}
+\permanent\protected\def\defcatcodecommand{\afterassignment\syst_catcodes_def_a\c_syst_catcodes_a}
+\permanent\protected\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
+ \expandafter\lastnamedcs
+ \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
+ \expandafter\lastnamedcs
+ \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
+ \expandafter\lastnamedcs
+ \else
+ \expandafter\syst_catcodes_ued_c
+ \fi}
+
+\def\syst_catcodes_let_c % only first time
+ {\frozen\enforced\gdefcsname\??catcodelet\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname\expandafter
+ {\enforced\letcsname\??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)
+ {\frozen\enforced\gdefcsname\??catcodedef\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
+ \expandafter##\expandafter1\expandafter
+ {\frozen\enforced\defcsname\??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
+ {\frozen\enforced\gdefcsname\??catcodeued\number\c_syst_catcodes_a:\number\c_syst_catcodes_b\expandafter\endcsname
+ \expandafter##\expandafter1\expandafter
+ {\frozen\enforced\protected\defcsname\??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}
+
+\permanent\def\reinstatecatcodecommand{\afterassignment\syst_catcodes_reinstate_normal\c_syst_catcodes_b}
+
+%D This can be used when a direct definition has been done and the selector has been
+%D lost. A problem is that \type {\next} needs to be unique (as it gets bound) (still?).
+
+\def\syst_catcodes_reinstate_normal
+ {\begingroup
+ \edef\temp{\noexpand\catcodecommand{\number\c_syst_catcodes_b}}%
+ \global\letcharcode\c_syst_catcodes_b\temp
+ \endgroup}
+
+\def\syst_catcodes_reinstate_unexpanded
+ {\begingroup
+ \protected\edef\temp{\noexpand\catcodecommand{\number\c_syst_catcodes_b}}%
+ \global\letcharcode\c_syst_catcodes_b\temp
+ \endgroup}
+
+\newconstant\defaultcatcodetable
+
+\permanent\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 use only one auxiliary
+%D file, which deals with tables of contents, registers, two pass tracking,
+%D references etc. This file, as well as files concerning graphics, is processed
+%D when needed, which can be in the mid of typesetting verbatim. However, when
+%D reading in data in verbatim mode, we should temporary restore the normal
+%D \CATCODES, and that's exactly what the next macros do. Saving the catcodes can be
+%D disabled by saying \type {\localcatcodestrue}. In \MKIV\ instead we can push and
+%D pop catcode tables and as we keep track of used tables users seldom need to deal
+%D with this themselves.
+
+\newcount\c_syst_catcodes_level
+
+\permanent\protected\def\pushcatcodetable
+ {\advance\c_syst_catcodes_level\plusone
+ \syst_catcodes_trace_push
+ \expandafter\integerdef\csname\??catcodetablet\number\c_syst_catcodes_level\endcsname\currentcatcodetable}
+
+\permanent\protected\def\popcatcodetable
+ {\ifcase\c_syst_catcodes_level
+ \syst_catcodes_trace_nesting_error
+ \else
+ \catcodetable\csname\??catcodetablet\number\c_syst_catcodes_level\endcsname
+ \syst_catcodes_trace_pop
+ \advance\c_syst_catcodes_level\minusone
+ \fi}
+
+\protected\def\syst_catcodes_trace_nesting_error
+ {\immediate\write\statuswrite{}%
+ \immediate\write\statuswrite{Fatal error: catcode push/pop mismatch. Fix this! (restore level: \number\c_syst_catcodes_level)}\wait\end
+ \immediate\write\statuswrite{}}
+
+\permanent\protected\def\restorecatcodes % takes previous level
+ {\ifnum\c_syst_catcodes_level>\plusone
+ \catcodetable\csname\??catcodetablet\number\numexpr\c_syst_catcodes_level-1\relax\endcsname
+ \fi}
+
+\permanent\protected\def\setcatcodetable#1%
+ {\catcodetable#1%
+ \syst_catcodes_trace_set}
+
+%D Handy for debugging (not that we ever use(d) it):
+%D
+%D \starttyping
+%D \tracecatcodetables
+%D \stoptyping
+
+\permanent\protected\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\write\statuswrite{[#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}
+
+\permanent\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
+
+\mutable\let\currentcatcodetable\catcodetable
+
+\endinput