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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 \newattribute will go away.
\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 \s!global \else \def\s!global{global} \fi % for metatex % or hard check later
\ifdefined \s!public \else \def\s!public{public} \fi % for metatex % or hard check later
\unexpanded\def\defineattribute
{\dodoubleempty\dodefineattribute}
\def\dodefineattribute[#1][#2]% alternatively we can let lua do the housekeeping
{\expandafter\newattribute\csname @attr@#1\endcsname
\expandafter\newconstant \csname :attr:#1\endcsname
\csname :attr:#1\endcsname\lastallocatedattribute
\ctxcommand{defineattribute("#1",\number\lastallocatedattribute)}%
%\writestatus\m!system{defining attribute #1 with number \number\lastallocatedattribute}%
\doifnotinset\s!global{#2}{\appendetoks\csname @attr@#1\endcsname\attributeunsetvalue\to\attributesresetlist}%
\doifinset \s!public{#2}{\expandafter\let\csname#1attribute\expandafter\endcsname\csname :attr:#1\endcsname}}
\unexpanded\def\definesystemattribute
{\dodoubleempty\dodefinesystemattribute}
\def\dodefinesystemattribute[#1][#2]% alternatively we can let lua do the housekeeping
{\scratchcounter\ctxcommand{getprivateattribute("#1")}\relax
\expandafter\attributedef\csname @attr@#1\endcsname\scratchcounter
\expandafter\newconstant \csname :attr:#1\endcsname
\csname :attr:#1\endcsname\scratchcounter
%\writestatus\m!system{defining system attribute #1 with number \number\scratchcounter}%
\doifnotinset\s!global{#2}{\appendetoks\csname @attr@#1\endcsname\attributeunsetvalue\to\attributesresetlist}%
\doifinset \s!public{#2}{\expandafter\let\csname#1attribute\expandafter\endcsname\csname :attr:#1\endcsname}}
% 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{\number\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] [public,global]
\definesystemattribute [color] [public]
\definesystemattribute [transparency] [public]
\definesystemattribute [background] [public]
\definesystemattribute [colorintent] [public]
\definesystemattribute [negative] [public]
\definesystemattribute [effect] [public]
\definesystemattribute [viewerlayer] [public]
\definesystemattribute [layoutcomponent] [public]
\definesystemattribute [reference] [public]
\definesystemattribute [destination] [public]
\definesystemattribute [internal] [public]
\definesystemattribute [ruled] [public]
\definesystemattribute [shifted] [public]
\protect \endinput
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