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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}{1.001}
\installcorenamespace{attributecount} % the counter representing the attribute (attrdef'd)
\installcorenamespace{attributeid} % the internal number
\installcorenamespace{attributestack} % the attribute specific stack
\unexpanded\def\pushattribute#1%
{\global\advance\csname\??attributestack\string#1\endcsname\plusone
\expandafter\xdef\csname\??attributestack\string#1:\number\csname\??attributestack\string#1\endcsname\endcsname{\number\attribute#1}}
\unexpanded\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}
\unexpanded\def\installattributestack#1%
{\ifcsname\??attributestack\string#1\endcsname \else
\expandafter\newcount\csname\??attributestack\string#1\endcsname
\fi}
\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\attr_basics_define}
\def\attr_basics_define[#1][#2]% alternatively we can let lua do the housekeeping
{\expandafter\newattribute\csname\??attributecount#1\endcsname
\expandafter\newconstant \csname\??attributeid#1\endcsname
\csname\??attributeid#1\endcsname\c_syst_last_allocated_attribute
\ctxcommand{defineattribute("#1",\number\c_syst_last_allocated_attribute)}%
\doifnotinset\s!global{#2}{\appendetoks\csname\??attributecount#1\endcsname\attributeunsetvalue\to\attributesresetlist}%
\doifinset \s!public{#2}{\expandafter\let\csname#1attribute\expandafter\endcsname\csname\??attributeid#1\endcsname}}
\unexpanded\def\definesystemattribute
{\dodoubleempty\attr_basics_define_system}
\def\attr_basics_define_system[#1][#2]% alternatively we can let lua do the housekeeping
{\scratchcounter\ctxcommand{getprivateattribute("#1")}\relax
\expandafter\attributedef\csname\??attributecount#1\endcsname\scratchcounter
\expandafter\newconstant \csname\??attributeid#1\endcsname
\csname\??attributeid#1\endcsname\scratchcounter
%\writestatus\m!system{defining system attribute #1 with number \number\scratchcounter}%
\doifnotinset\s!global{#2}{\appendetoks\csname\??attributecount#1\endcsname\attributeunsetvalue\to\attributesresetlist}%
\doifinset \s!public{#2}{\expandafter\let\csname#1attribute\expandafter\endcsname\csname\??attributeid#1\endcsname}}
% expandable so we can \edef them for speed
\def\dosetattribute#1#2{\csname\??attributecount#1\endcsname#2\relax}
\def\doresetattribute#1{\csname\??attributecount#1\endcsname\attributeunsetvalue}
\def\dogetattribute #1{\number\csname\??attributecount#1\endcsname}
\def\dogetattributeid#1{\number\csname\??attributeid#1\endcsname}
\let\dompattribute\gobbletwoarguments
\unexpanded\def\resetallattributes{\the\attributesresetlist}
%D Rather special.
\unexpanded\def\savecurrentattributes #1{\ctxcommand{savecurrentattributes ("#1")}}
\unexpanded\def\restorecurrentattributes#1{\ctxcommand{restorecurrentattributes("#1")}}
%D For the moment we put this here (later it will move to where it's used):
\definesystemattribute [state]
\definesystemattribute [color] [public]
\definesystemattribute [colormodel] [public,global]
\definesystemattribute [skip]
\definesystemattribute [penalty]
\definesystemattribute [transparency] [public]
\definesystemattribute [background] [public]
\definesystemattribute [alignbackground] [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]
\definesystemattribute [checkedbreak] [public]
\definesystemattribute [vboxtohboxseparator] [public]
\unexpanded\def\showattributes{\ctxcommand{showattributes()}}
\protect \endinput
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