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%D \module
%D [ file=prop-ini,
%D version=2003.04.20,
%D title=\CONTEXT\ Property Macros,
%D subtitle=Initialization,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 Property Macros / Initialization}
%D This module is replaced by dedicated mechanisms. Originally properties were
%D a sort of attributes in \MKII, but now we do things different anyway. We keep
%D a surrogate mechanism around for compatibility reasons but even this will
%D become obsolete some day.
\unprotect
\def\propertyobsoletemessage
{\writestatus\m!system{properties are obsolete, use dedicated commands}%
\glet\propertyobsoletemessage\donothing}
\setvalue{\??py:d:\v!layer }[#1][#2][#3]{\defineviewerlayer[#1][#3]}
\setvalue{\??py:d:\s!effect }[#1][#2][#3]{\defineeffect [#1][#3]}
\setvalue{\??py:d:\v!negative}[#1][#2][#3]{}
\unexpanded\def\defineproperty
{\dotripleempty\dodefineproperty}
\def\dodefineproperty[#1][#2][#3]%
{\propertyobsoletemessage
\setevalue{\??py#1\c!type}{#2}%
\getvalue{\??py:d:#2}[#1][#2][#3]}
\setvalue{\??py:s:\v!layer }#1{\let\dostopproperty\stopviewerlayer\startviewerlayer[#1]}
\setvalue{\??py:s:\s!effect }#1{\let\dostopproperty\stopeffect \starteffect [#1]}
\setvalue{\??py:s:\v!negative}#1{\let\dostopproperty\stopnegative \startnegative }
\unexpanded\def\property[#1]%
{\groupedcommand{\dostartproperty{#1}}\dostopproperty}
\unexpanded\def\startproperty[#1]%
{\dostartproperty{#1}}
\unexpanded\def\stopproperty
{\dostopproperty}
\unexpanded\def\dostartproperty#1%
{\pushmacro\dostopproperty
\getvalue{\??py:s:\getvalue{\??py#1\c!type}}{#1}}
\unexpanded\def\dostopproperty
{\dostopproperty
\popmacro\dostopproperty}
\protect \endinput
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