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%D \module
%D [ file=back-exp,
%D version=2010.08.22,
%D title=\CONTEXT\ Backend Macros,
%D subtitle=XML export,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%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 Backend Macros / XML export}
\registerctxluafile{back-exp.lua}{}
%D This is an experimental exporter and a logical follow up on tagging. The
%D exporter assumes a properly tagged document. Some elements get a couple
%D of attributes becaus eitherwise rendering information would get lost. In
%D general we assume that when the \XML\ is converted to \HTML\ some stylesheet
%D is applied anyway.
\unprotect
% we can replace this by a more generic attributeset mechanism where we bind
% to any element (needed anyway, see userdata thingies)
\definesystemattribute[taggedrows] [public]
\definesystemattribute[taggedcolumns][public]
\definesystemattribute[taggedalign] [public]
\definesystemattribute[taggedpar] [public]
\definesystemattribute[taggedpacked] [public]
\definesystemattribute[taggedsymbol] [public]
\definesystemattribute[taggedinsert] [public]
\def\setelementexporttag
{\dotripleargument\dosetelementexporttag}
\def\dosetelementexporttag[#1][#2][#3]%
{\ifthirdargument
\ctxlua{structures.tags.settagproperty("#1","#2", "#3")}%
\else\ifsecondargument
\ctxlua{structures.tags.settagproperty("#1","export", "#2")}%
\fi\fi}
\newcount\tagparcounter
\let\dotagsetparcounter\relax
\appendtoks
\dotagsetparcounter
\to \everypar
\appendtoks
\dotagsetparcounter
\to \neverypar
\appendtoks
\dotagsetparcounter
\to \everytabulatepar % tricky, maybe this should be neverypar
\appendtoks
\def\dotagnoftablecolumns{\attribute\taggedcolumnsattribute\!!counta}%
\def\dotagnoftablerows {\attribute\taggedrowsattribute \!!countb}%
\to \everyenableelements
\appendtoks
\def\dotagTABLEalign{\attribute\taggedalignattribute\raggedstatus}%
\def\dotagTABLEcell {\char\zerocount}%
\to \everyenableelements
\appendtoks
\def\dotagtabulatealign{\attribute\taggedalignattribute\ifcase\tabulatealign\attributeunsetvalue\or\plusthree\or\plusone\or\plustwo\or\attributeunsetvalue\fi}%
\to \everyenableelements
\appendtoks
\def\dotagsetparcounter{\global\advance\tagparcounter\plusone\attribute\taggedparattribute\tagparcounter}%
\to \everyenableelements
\appendtoks
\def\dotagsetitemize{\ctxlua{structures.tags.setitemgroup(\ifconditional\packlistitem true\else false\fi,"\currentitemsymbol")}}%
\to \everyenableelements
\appendtoks
\def\dotagsetdescriptiontag{\ctxlua{structures.tags.setdescriptionid("\currentdescription",\currentdescriptionnumberentry)}}%
\to \everyenableelements
\appendtoks
\def\dotagsetnotesymbol{\ctxlua{structures.tags.setdescriptionid("\currentnote",\currentnotenumber)}}%
\to \everyenableelements
% The action: \setubackend[export=yes] % or filename
\def\c!export{export}
\appendtoks
\doifsomething{\backendparameter\c!export}
{\setupstructure[\c!state=\v!start]%
\enabledirectives[backend.export=\backendparameter\c!export]}%
\to \everysetupbackend
\protect \endinput
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