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%D \module
%D [ file=attr-eff,
%D version=2007.06.06,
%D title=\CONTEXT\ Attribute Macros,
%D subtitle=Effects,
%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 / Effects}
\registerctxluafile{attr-eff}{}
\unprotect
\installcorenamespace{effect}
\installcommandhandler \??effect {effect} \??effect
\setupeffect
[\c!method=\v!none,
\c!stretch=\zerocount,
\c!rulethickness=\zeropoint,
\c!alternative=\v!normal]
\appendtoks
\edef\p_method{\effectparameter\c!method}%
\ifx\p_method\v!command
\frozen\protected\xdefcsname\e!start\currenteffect\endcsname{\starteffect[#1]}%
\frozen\protected\xdefcsname\e!stop \currenteffect\endcsname{\stopeffect}%
\fi
\to \everydefineeffect
\permanent\protected\def\starteffect[#1]%
{\clf_seteffect
alternative {\namedeffectparameter{#1}\c!alternative}
stretch \numexpr\namedeffectparameter{#1}\c!stretch\relax
rulethickness \dimexpr\namedeffectparameter{#1}\c!rulethickness\relax
\relax}
\permanent\protected\def\stopeffect % can be special
{\clf_reseteffect} % v!normal 0 0
\permanent\protected\def\effect[#1]%
{\groupedcommand{\starteffect[#1]}{\stopeffect}}
% yes or no grouped
\defineeffect [\v!inner] [\c!alternative=\v!inner,\c!rulethickness=.25pt]
\defineeffect [\v!outer] [\c!alternative=\v!outer,\c!rulethickness=.25pt]
\defineeffect [\v!both] [\c!alternative=\v!both, \c!rulethickness=.25pt]
\defineeffect [\v!normal] [\c!alternative=\v!normal]
\defineeffect [\v!hidden] [\c!alternative=\v!hidden]
\defineeffect [\v!stretch] [\c!alternative=\v!stretch,\c!stretch=1]
\protect \endinput
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