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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]
%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.
\unprotect
\registerctxluafile{attr-ini}{1.001}
\def\pushattribute#1%
{\global\advance\csname\??ae:\string#1\endcsname\plusone
\global\expandafter\mathchardef\csname\??ae:\string#1:\number\csname\??ae:\string#1\endcsname\endcsname\attribute#1}
\def\popattribute#1%
{\attribute#1\csname\??ae:\string#1:\number\csname\??ae:\string#1\endcsname\endcsname
\global\advance\csname\??ae:\string#1\endcsname\minusone}
\def\installattributestack#1%
{\expandafter\newcount\csname\??ae:\string#1\endcsname}
\newtoks \attributesresetlist
\ifdefined \v!global \else \def\v!global{global} \fi % for metatex
\unexpanded\def\defineattribute
{\dodoubleempty\dodefineattribute}
\def\dodefineattribute[#1][#2]% alternatively we can let lua do the housekeeping
{\expandafter\newattribute\csname @attr@#1\endcsname
\expandafter \xdef\csname :attr:#1\endcsname{\number\lastallocatedattribute}%
\ctxlua{attributes.define("#1",\number\lastallocatedattribute)}%
%\writestatus\m!systems{defining attribute #1 with number \number\lastallocatedattribute}%
\doifnotinset\v!global{#2}{\appendetoks\csname @attr@#1\endcsname\attributeunsetvalue\to\attributesresetlist}}
\unexpanded\def\definesystemattribute
{\dodoubleempty\dodefinesystemattribute}
\def\dodefinesystemattribute[#1][#2]% alternatively we can let lua do the housekeeping
{\scratchcounter\ctxlua{tex.print(attributes.private("#1"))}\relax
\global\expandafter\attributedef\csname @attr@#1\endcsname\scratchcounter
\expandafter \xdef\csname :attr:#1\endcsname{\number\scratchcounter}%
%\writestatus\m!systems{defining system attribute #1 with number \number\scratchcounter}%
\doifnotinset\v!global{#2}{\appendetoks\csname @attr@#1\endcsname\attributeunsetvalue\to\attributesresetlist}}
% expandable so we can \edef them for speed
\def\dosetattribute#1#2{\csname @attr@#1\endcsname#2\relax}
\def\doresetattribute#1{\csname @attr@#1\endcsname\attributeunsetvalue}
\def\dogetattribute #1{\number\csname @attr@#1\endcsname}
\def\dogetattributeid#1{\csname :attr:#1\endcsname}
\let\dompattribute\gobbletwoarguments
\def\resetallattributes{\the\attributesresetlist}
%D For the moment we put this here (later it will move to where it's used):
\definesystemattribute[state]
\definesystemattribute[skip]
\definesystemattribute[penalty]
\definesystemattribute[colormodel][global] \chardef\colormodelattribute \dogetattributeid{colormodel}
\definesystemattribute[color] \chardef\colorattribute \dogetattributeid{color}
\definesystemattribute[transparency] \chardef\transparencyattribute \dogetattributeid{transparency}
\definesystemattribute[background] \chardef\backgroundattribute \dogetattributeid{background}
\definesystemattribute[colorintent] \chardef\colorintentattribute \dogetattributeid{colorintent}
\definesystemattribute[negative] \chardef\negativeattribute \dogetattributeid{negative}
\definesystemattribute[effect] \chardef\effectattribute \dogetattributeid{effect}
\definesystemattribute[viewerlayer] \chardef\viewerlayerattribute \dogetattributeid{viewerlayer}
\definesystemattribute[layoutcomponent] \chardef\layoutcomponentattribute\dogetattributeid{layoutcomponent}
\definesystemattribute[reference] \chardef\referenceattribute \dogetattributeid{reference}
\definesystemattribute[destination] \chardef\destinationattribute \dogetattributeid{destination}
\definesystemattribute[graphicvadjust] \chardef\graphicvadjustattribute \dogetattributeid{graphicvadjust}
\definesystemattribute[ruled] \chardef\ruledattribute \dogetattributeid{ruled}
\definesystemattribute[shifted] \chardef\shiftedattribute \dogetattributeid{shifted}
\protect \endinput
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