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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]
%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}
% more will move to the lua end (old code, early luatex approach)
\unprotect
\def\registereffect#1#2#3% #2=stretch #3=rulethickness
{\setxvalue{(es:#1:#2:\number\dimexpr#3\relax)}%
{\attribute\effectattribute\ctxlua{tex.write(attributes.effects.register('#1',#2,\number\dimexpr#3\relax))}\relax}}
\def\dotriggereffect
{\ctxlua{attributes.effects.enable()}%
\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}
\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{\getvalue{\??et#1\c!alternative}}{\getvalue{\??et#1\c!stretch}}{\getvalue{\??et#1\c!rulethickness}}}
\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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