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%D \module
%D [ file=filt-ini,
%D version=2000.09.19,
%D title=\CONTEXT\ Filter Macros,
%D subtitle=Initialization,
%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 Filter Macros / Initialization}
% \ifx\OmegaVersion\undefined
% \let\definefiltersynonym \gobbledoubleempty
% \let\definefiltersequence \gobbledoubleempty
% \unexpanded\def\usefiltersequence {\gobblesingleempty}
% \let\usefilter \gobblesingleempty
% \let\truefiltername \gobbleoneargument
% \expandafter \endinput
% \fi
\unprotect
%D The real work starts here.
% We need the {\??ot::#1} check because otherwise aleph will crash. Taco's
% torture test:
%
% \ocp\ArabicContext = contextual
%
% \dorecurse {5000} {
% \message{[\recurselevel]}
% \ocplist\Arabic=\addbeforeocplist 1 \ArabicContext \nullocplist
% }
%D \macros
%D {definefiltersynonym}
\def\definefiltersynonym
{\dodoubleargument\dodefinefiltersynonym}
\def\dodefinefiltersynonym[#1][#2]%
{\setvalue{\??or#1}{#2}}
%D \macros
%D {truefiltername}
\def\truefiltername#1%
{\ifundefined{\??or#1}#1\else\truefiltername{\getvalue{\??or#1}}\fi}
%D \macros
%D {definefiltersequence}
\def\definefiltersequence
{\dodoubleargument\dodefinefiltersequence}
% \def\dodefinefiltersequence[#1][#2]%
% {\setvalue{\??ot#1}{#2}}
\def\dodefinefiltersequence[#1][#2]%
{\setxvalue{\??ot#1}{#2}%
\letgvalue{\??ot::#1}\v!stop}
%D \macros
%D {usefiltersequence}
%D
\def\magicocpnumber{1}
% one can do:
%
% \definefiltersequence
% [farsi]
% [utf8 to unicode16=>5,
% persian fix,
% arabic analysis=>3,
% arabic glyphs]
%
% so, => is used to signal a priority
\def\dodousefiltersequence#1%
{\expandafter\ocp\csname\??or:#1\endcsname=\truefiltername{#1}\relax
\splitstring#1\at=>\to\!!stringa\and\!!stringb
\edef\!!stringb{\number\ifx\!!stringb\empty\magicocpnumber\else\!!stringb\fi}%
\appendetoks
\noexpand\addbeforeocplist
\!!stringb\space
\expandafter\noexpand\csname\??or:\!!stringa\endcsname
\to \scratchtoks}
\unexpanded\def\usefiltersequence[#1]%
{\doifdefined{\??ot::#1}%
{\doifvalue{\??ot::#1}\v!stop
{\scratchtoks\emptytoks
\expanded{\processcommalist[\getvalue{\??ot#1}]}\dodousefiltersequence
\expanded{\global\ocplist\csname\??ot:#1\endcsname=\the\scratchtoks}\nullocplist
\letgvalue{\??ot::#1}\v!start}%
\expanded{\pushocplist\csname\??ot:#1\endcsname}\relax}}
%D \macros
%D {usefilter}
\def\dousefilter#1%
{\doifundefined{\c!file\f!filterprefix#1}%
{\letvalue{\c!file\f!filterprefix#1}\empty
\makeshortfilename[\truefilename{\f!filterprefix#1}]%
\startreadingfile
\readsysfile{\shortfilename.mkii}
{\showmessage\m!filters1{#1}}
{\showmessage\m!filters2{#1}}%
\stopreadingfile}}
\def\usefilter[#1]%
{\processcommalist[#1]\dousefilter}
\protect \endinput
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