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%D \module
%D [ file=attr-ini,
%D version=2007.06.06,
%D title=\CONTEXT\ Attribute Macros,
%D subtitle=Initialization,
%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.
\writestatus{loading}{ConTeXt Attribute Macros / Initialization}
%D Although it's still somewhat experimental, here we introduce code
%D related to attributes. Housekeeping will move completely to \LUA\
%D and \type {\newattribute} will go away.
\unprotect
\registerctxluafile{attr-ini}{}
\installcorenamespace{attributecount} % the counter representing the attribute (attrdef'd)
\installcorenamespace{attributeid} % the internal number
\installcorenamespace{attributestack} % the attribute specific stack
\installcorenamespace{attributepickup}
\permanent\protected\def\pushattribute#1%
{\global\advance\csname\??attributestack\string#1\endcsname\plusone
\global\defcsname\??attributestack\string#1:\number\csname\??attributestack\string#1\endcsname\endcsname{\number\attribute#1}}
\permanent\protected\def\popattribute#1%
{\attribute#1\csname\??attributestack\string#1:\number\csname\??attributestack\string#1\endcsname\endcsname\relax
\global\advance\csname\??attributestack\string#1\endcsname\minusone}
\permanent\protected\def\installattributestack#1%
{\ifcsname\??attributestack\string#1\endcsname \else
\expandafter\newcount\csname\??attributestack\string#1\endcsname
\fi}
\newtoks \t_attr_list_global
\newtoks \t_attr_list_local
\newtoks \t_attr_list_pickup
\newtoks \t_attr_list_nomath
\ifdefined \s!global \else \immutable\def\s!global {global} \fi % for metatex % or hard check later
\ifdefined \s!public \else \immutable\def\s!public {public} \fi % for metatex % or hard check later
\ifdefined \s!private \else \immutable\def\s!private {private} \fi % for metatex % or hard check later
\ifdefined \s!attribute \else \immutable\def\s!attribute{attribute} \fi % for metatex % or hard check later
\ifdefined \s!pickup \else \immutable\def\s!pickup {pickup} \fi % for metatex % or hard check later
\ifdefined \s!forget \else \immutable\def\s!forget {forget} \fi % for metatex % or hard check later
\immutable\def\??attributeprefix{c_attr_}
\permanent\protected\def\defineattribute {\attr_basics_define_indeed[\s!public ]}
\permanent\protected\def\definesystemattribute{\attr_basics_define_indeed[\s!private]}
\tolerant\def\attr_basics_define_indeed[#1]#*[#2]#*[#3]%
{\ifcsname\??attributeprefix#2\endcsname\else
\scratchcounter\clf_defineattribute{#2}{#1}\relax
%\writestatus\m!system{defining #1 attribute #2 with number \number\scratchcounter}%
\global\permanent\expandafter\attributedef\csname\??attributeprefix#2\endcsname\scratchcounter % \foo = 123
\global\permanent\expandafter\integerdef \csname\??attributeid #2\endcsname\scratchcounter % \attribute\foo = 123
% some attributes are always global
\doifelseinset\s!global{#3}%
{\xtoksapp\t_attr_list_global{\csname\??attributeprefix#2\endcsname\attributeunsetvalue}}% \c_attr_foo
{\xtoksapp\t_attr_list_local {\csname\??attributeprefix#2\endcsname\attributeunsetvalue}}%
\doifinset\s!nomath{#3}%
{\xtoksapp\t_attr_list_nomath{\csname\??attributeprefix#2\endcsname\attributeunsetvalue}}%
\doifinset\s!public{#3}%
{\aliased\global\letcsname#2\s!attribute\expandafter\endcsname\csname\??attributeid#2\endcsname}% \attribute\fooattribute
\doifinset\s!pickup{#3}%
{\global\expandafter\integerdef\csname\??attributepickup#2\endcsname\attributeunsetvalue
\xtoksapp\t_attr_list_pickup{\csname\??attributeprefix#2\endcsname\csname\??attributepickup#2\endcsname}%
\ifcsname#2\s!attribute\endcsname
\global\edefcsname\s!pickup#2\s!attribute\endcsname{\expandafter\integerdef\csname\??attributepickup#2\endcsname\csname\??attributeprefix#2\endcsname}%
\global\edefcsname\s!forget#2\s!attribute\endcsname{\expandafter\integerdef\csname\??attributepickup#2\endcsname\attributeunsetvalue}%
\fi}%
\fi}
\permanent\protected\def\pickupattributes
{\the\t_attr_list_pickup\relax}
\permanent\protected\def\newattribute#1%
{\attr_basics_define_indeed\s!public[\csstring#1][]%
\expandafter\glet\expandafter#1\csname\??attributeid\csstring#1\endcsname}
% expandable so we can \edef them for speed
\permanent\def\dosetattribute#1#2{\csname\??attributeprefix#1\endcsname#2\relax}
\permanent\def\doresetattribute#1{\csname\??attributeprefix#1\endcsname\attributeunsetvalue}
\permanent\def\dogetattribute #1{\number\csname\??attributeprefix#1\endcsname}
\permanent\def\dogetattributeid#1{\number\csname\??attributeid #1\endcsname}
\aliased\let\dompattribute\gobbletwoarguments
\permanent\protected\def\resetglobalattributes{\the\t_attr_list_global\glyphdatafield\zerocount\glyphscriptfield\zerocount}
\permanent\protected\def\resetlocalattributes {\the\t_attr_list_local \glyphdatafield\zerocount\glyphscriptfield\zerocount}
\aliased\let\resetallattributes\resetlocalattributes
%D Rather special.
\permanent\protected\def\savecurrentattributes #1{\clf_savecurrentattributes {#1}}
\permanent\protected\def\restorecurrentattributes#1{\clf_restorecurrentattributes{#1}}
%D For the moment we put this here. The order of definition matters a bit because
%D performance is better when we put frequently accessed attributes at the front.
%D So, we might move more here.
%definesystemattribute [state] % nomath
\definesystemattribute [color] [public] % global
\definesystemattribute [colormodel] [public,global]
%definesystemattribute [skip]
%definesystemattribute [penalty]
\definesystemattribute [transparency] [public]
\definesystemattribute [reference] [public]
\definesystemattribute [destination] [public]
\definesystemattribute [case] [public]
\definesystemattribute [visual] [public,global]
\definesystemattribute [viewerlayer] [public]
\definesystemattribute [background] [public]
\definesystemattribute [alignbackground] [public]
\definesystemattribute [colorintent] [public]
\definesystemattribute [negative] [public]
\definesystemattribute [effect] [public]
\definesystemattribute [layoutcomponent] [public]
\definesystemattribute [internal] [public]
\definesystemattribute [ruled] [public]
\definesystemattribute [shifted] [public]
\definesystemattribute [checkedbreak] [public]
\definesystemattribute [vboxtohboxseparator] [public]
\permanent\protected\let\showattributes\clf_showattributes % maybe at lua end
%D Todo:
% \appendtoks
% \clf_cleanupattributes
% \to \everyafterpagebreak
\protect \endinput
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