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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}
%D This might move:
\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}
%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]
\definesystemattribute[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[ignore]
%
% \edef\startignorecontent{\dosetattribute{ignore}\plusone}
% \edef\stopignorecontent {\doresetattribute{ignore}}
% todo: no need for 'color' argument, we can set that once at startup; currently
% a bit inconsistent
% 1=off 2=gray 3=spot 4=rgb 5=cmyk 6=cmy % only 1/2/4/5 are supported
%
% We could combine this in one attribute but this is not faster and also
% less flexible because sometimes we want to freeze the attribute bit.
%
% Watch out: real color support will be implemented later.
\newcount\currentcolormodel
\def\setcolormodel#1%
{\currentcolormodel\ctxlua{tex.print(colors.setmodel('#1'))}%
\dosetattribute{colormodel}{\the\currentcolormodel}}
\setcolormodel{all}
\appendtoks
\setcolormodel{all}% redundant?
\to \everyjob
\def\registerrgbcolor #1#2#3#4{\ctxlua{colors.register('#1','rgb' ,#2,#3,#4)}}
\def\registercmykcolor#1#2#3#4#5{\ctxlua{colors.register('#1','cmyk',#2,#3,#4,#5)}}
\def\registergraycolor #1#2{\ctxlua{colors.register('#1','gray',#2)}}
% transparency
\def\registertransparency#1#2#3%
{\setevalue{(ts:#1)}{\dosetattribute{transparency}{\ctxlua{tex.print(transparencies.register(#2,#3))}}}}
\def\sometransparencyswitch#1{\csname(ts:#1)\endcsname}
\def\sometransparencyswitch
{\ctxlua{transparencies.enabled=true}%
\gdef\sometransparencyswitch##1{\csname(ts:##1)\endcsname}%
\sometransparencyswitch}
% \registertransparency {one} {1} {.5}
% \registertransparency {two} {1} {.6}
% overprint
\def\registercolorintent#1#2%
{\setevalue{(os:#1)}{\dosetattribute{colorintent}{\ctxlua{tex.print(colorintents.register('#2'))}}}}
\def\dotriggercolorintent
{\ctxlua{colorintents.enabled=true}%
\gdef\dotriggercolorintent##1{\csname(os:##1)\endcsname}%
\dotriggercolorintent}
\registercolorintent{knockout} {knockout}
\registercolorintent{overprint}{overprint}
\installattributestack\colorintentattribute
\setevalue{(os:#\v!none}{\doresetattribute{colorintent}} % does this work out ok?
% negative
\def\registernegative#1#2%
{\setevalue{(ns:#1)}{\dosetattribute{negative}{\ctxlua{tex.print(negatives.register('#2'))}}}}
\def\dotriggernegative
{\ctxlua{negatives.enabled=true}%
\gdef\dotriggernegative##1{\csname(ns:##1)\endcsname}%
\dotriggernegative}
\registernegative{positive}{positive}
\registernegative{negative}{negative}
% effect
\def\registereffect#1#2#3% #2=stretch #3=rulethickness
{\setxvalue{(es:#1:#2:\number\dimexpr#3\relax)}%
{\dosetattribute{effect}{\ctxlua{tex.print(effects.register('#1',#2,\number\dimexpr#3\relax))}}}}
\def\dotriggereffect
{\ctxlua{effects.enabled=true}%
\gdef\dotriggereffect##1##2##3%
{\ifcsname(es:##1:##2:\number\dimexpr##3\relax)\endcsname\else\registereffect{##1}{##2}{##3}\fi
\csname(es:##1:##2:\number\dimexpr##3\relax)\endcsname}%
\dotriggereffect}
% \registereffect{normal}
% \registereffect{inner}
% \registereffect{outer}
% \registereffect{both}
% \registereffect{hidden}
% viewerlayers (will probably change a bit)
% \def\registerviewerlayer#1#2% global !
% {\setxvalue{(vl:#1)}{\dosetattribute{viewerlayer}{\ctxlua{tex.print(viewerlayers.register('#2'))}}}}
%
% \setevalue{(vl:)}{\doresetattribute{viewerlayer}}
%
% needs to work over stopitemize grouping etc
\def\registerviewerlayer#1#2% global !
{\setxvalue{(vl:#1)}{\global\dosetattribute{viewerlayer}{\ctxlua{tex.print(viewerlayers.register('#2'))}}}}
\setevalue{(vl:)}{\global\doresetattribute{viewerlayer}}
\def\dotriggerviewerlayer
{\ctxlua{viewerlayers.enabled=true}%
\gdef\dotriggerviewerlayer##1{\csname(vl:##1)\endcsname}%
\dotriggerviewerlayer}
\protect \endinput
% test case
%
% {\green \hbox to \hsize{\leaders\hrule \hfill a}\par}
% {\red \hbox to \hsize{\leaders\hbox{x}\hfill a}\par}
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