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%D \module
%D [ file=regi-ini,
%D version=2000.12.27, % 1998.12.03,
%D title=\CONTEXT\ Regime Macros,
%D subtitle=Initialization,
%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.
\unprotect
%D Remark: regimes accumulate, so there is no explicit reset in
%D mkii mode.
%D Variables.
\def\@reg@{@r@eg@} % regime prefix
%D \macros
%D {currentregime}
\let\currentregime\empty
\let\defaultregime\s!default
%D Some low level inheritance stuff (mkii).
\def\doautosetregime#1#2%
{\ifnum#2>127
\expanded{\defineactivetoken #2 \@EA\noexpand\csname#1\endcsname}%
\fi}
%D \macros
%D {startregime}
%D
%D Sometimes it makes sense to activate the characters in the
%D upper half of the character table. Such a bundle of
%D characters can be packages in a regime. Later we will see
%D encodings (that links characters slots to glyphs) and
%D mappings (that take care of hyphenation and case changes).
%D
%D When character~231 is of category code letter, it
%D directly maps to glyph~231 (unless of course some virtual
%D font is used). By making character~231 active, we can map
%D it onto for instance the glyph in slot 233. This mapping
%D can in itself be indirect, in the sense that it is for
%D instance handled by an accent command.
%D
%D Regimes are implemented roughly the same as mappings, but
%D enabled under different circumstances. In the future, the
%D low level implementation may change.
\def\startregime[#1]%
{\pushmacro\currentregime
\edef\currentregime{#1}%
\checkregimetoks}
\def\checkregimetoks
{\doifundefined{\@reg@\currentregime}
{\@EA\newtoks\csname\@reg@\currentregime\endcsname}}
\def\stopregime
{\popmacro\currentregime}
\def\setregimetoks
{\checkregimetoks
\@EA\let\@EA\regimetoks\csname\@reg@\currentregime\endcsname}
%D \macros
%D {defineactivedecimal, defineactivedecimals, defineactivetoken}
%D
%D The following commands are rather ugly ones. It makes a
%D character active and assigns it a value. When expanded,
%D the decimal number of the character is passed as first
%D argument.
%D
%D \starttyping
%D \def\decimalcharacter#1{\message{#1 is now active}}
%D
%D \defineactivedecimal 122 {\decimalcharacter}
%D
%D \defineactivedecimals 128 to 255 as {\decimalcharacter}
%D \stoptyping
%D
%D This command is typically used in coding definitions,
%D like the \UNICODE\ one.
\def\dodefineactivedecimal#1#2% \unexpanded ? pdfdoc encoding
{\catcode#1\active
\scratchcounter\uccode\activehackcode
\uccode\activehackcode#1\relax
\uppercase{\unexpanded\edef~{\noexpand#2{\number#1}}}%
\uccode\activehackcode\scratchcounter}
\long\def\defineactivedecimal#1 #2 %
{\setregimetoks
\regimetoks\expandafter{\the\regimetoks\dodefineactivedecimal{#1}{#2}}}
\long\def\defineactivedecimals#1 to #2 as #3 %
{\setregimetoks
\dostepwiserecurse{#1}{#2}\plusone
{\regimetoks\@EA\@EA\@EA{\@EA\the\@EA\regimetoks\@EA\dodefineactivedecimal\@EA{\recurselevel}{#3}}}}
\def\doexpandactivedecimal#1%
{\ifnum#1>\scratchcounter
\expandafter\gobbletwoarguments
\else
\noexpand\dodefineactivedecimal{#1}{\the\scratchtoks}%
\expandafter\expandafter\expandafter\doexpandactivedecimal\expandafter
\fi\expandafter{\the\numexpr#1+\plusone\relax}}
\long\def\defineactivedecimals#1 to #2 as #3 %
{\setregimetoks
\scratchcounter#2\relax
\scratchtoks{#3}%
\expanded{\regimetoks{\the\regimetoks\doexpandactivedecimal{#1}}}%
\ignorespaces}
\long\def\defineactivetoken #1 #2% no {} after #2, else no kern
{\setregimetoks
\regimetoks\expandafter{\the\regimetoks\defineactivecharacter#1 {#2}}}
\long\def\defineactiveinspector #1 #2% watch the missing {}
{\setregimetoks
\regimetoks\expandafter{\the\regimetoks\defineactivecharacter#1 {#2}}}
%D \macros
%D {defineregimesynonym,trueregimename}
\def\defineregimesynonym
{\dodoubleargument\dodefineregimesynonym}
\def\dodefineregimesynonym[#1][#2]%
{\setevalue{\@reg@:s:#1}{#2}}
\def\trueregimename#1%
{\executeifdefined{\@reg@:s:#1}{#1}}
%D \macros
%D {useregime}
\def\useregime[#1]%
{\processcommalist[#1]\douseregime}
\def\douseregime#1%
{\doifundefined{\c!file\f!regimeprefix#1}%
{\letgvalue{\c!file\f!regimeprefix#1}\empty
\makeshortfilename[\truefilename{\f!regimeprefix#1}]%
\startreadingfile
\readsysfile{\shortfilename.mkii}
{\showmessage\m!regimes2{#1}}
{\showmessage\m!regimes3{#1}}%
\stopreadingfile}}
%D \macros
%D {enableregime,disableregime}
\let\enabledregime\empty
\def\enableregime[#1]%
{\edef\currentregime{\trueregimename{#1}}%
\doifelsenothing\currentregime
{\disableregime}
{\douseregime\currentregime
\the\executeifdefined{\@reg@\currentregime}\emptytoks}}
\def\disableregime
{\let\currentregime\empty}
%D \macros
%D {protectregime, settoletterunlessactive, settocodeunlessactive}
%D
%D The next boolean is used later on to prevent unwanted
%D catcode changes. Use it with care.
\newif\ifprotectregime \protectregimetrue
\def\settoletterunlessactive#1%
{\ifprotectregime\ifnum\catcode#1=\active\else
\catcode#1\@@letter
\fi\else
\catcode#1\@@letter
\fi}
\def\settootherunlessactive#1%
{\ifprotectregime\ifnum\catcode#1=\active\else
\catcode#1=\@@other
\fi\else
\catcode#1=\@@other
\fi}
\def\settocodeunlessactive#1#2%
{\ifprotectregime\ifnum\catcode#1=\active\else
\catcode#1=#2\relax
\fi\else
\catcode#1=#2\relax
\fi}
%D Goodie:
\def\showregime[#1]%
{\doifnot{#1}{utf}
{\bgroup
\enableregime[#1]%
\starttabulate[|l|l|l|]
\dostepwiserecurse{128}{255}{1}
{\expanded
{\scantokens
{\NC \recurselevel
\NC \rawcharacter\recurselevel
\NC \noexpand\tttf
\noexpand\meaning\rawcharacter\recurselevel \NC \NR}}}%
\stoptabulate
\unskip
\egroup}}
%D Sort related:
\def\dowalkregime#1%
{\the\executeifdefined{\@reg@#1}\emptytoks}
%D Simplify matters for \XETEX.
\ifnum\texengine=\xetexengine
\def\enableregime[#1]%
{\doifelse{#1}{utf}%
{\writestatus\m!regimes{mapping utf to utf-8}%
\XeTeXinputencoding{utf-8}}
{\XeTeXinputencoding{#1}}}
\def\disableregime
{\XeTeXinputencoding{utf-8}}
\def\loadregime[#1]{}
\let\walkregime \gobbleoneargument
\let\doautosetregime \gobbletwoarguments
\else
\useregime[def,uni,utf] % we load the rest runtime
\fi
\protect \endinput
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