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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}{1.001}
\unprotect
\gdef\dotriggereffect#1#2#3%
{\ctxcommand{triggereffect('#1',#2,\number\dimexpr#3\relax)}}
\unexpanded\def\setupeffect
{\dodoubleargument\dosetupeffect}
\def\dosetupeffect[#1][#2]%
{\getparameters[\??et#1][#2]}
\unexpanded\def\defineeffect
{\dodoubleargument\dodefineeffect}
\def\dodefineeffect[#1][#2]%
{\getparameters[\??et#1][\c!method=\v!none,\c!stretch=0,\c!rulethickness=\zeropoint,\c!alternative=\v!normal,#2]%
\doif{\getvalue{\??et#1\c!method}}\v!command
{\setugvalue{\e!start#1}{\starteffect[#1]}%
\setugvalue{\e!stop #1}{\stopeffect}}}
% yes or no grouped
\unexpanded\def\starteffect[#1]%
{\dotriggereffect
{\csname\??et#1\c!alternative \endcsname}%
{\csname\??et#1\c!stretch \endcsname}%
{\csname\??et#1\c!rulethickness\endcsname}}
\unexpanded\def\stopeffect % can be special
{\dotriggereffect\v!normal0\zeropoint}
\unexpanded\def\effect[#1]%
{\groupedcommand{\starteffect[#1]}{\stopeffect}}
\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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