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%D \module
%D [ file=typo-dir,
%D version=2009.03.27, % code moved from core-spa.mkiv
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Directions,
%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 Typesetting Macros / Directions}
\unprotect
\registerctxluafile{typo-dir}{1.001}
\definesystemattribute[directions] \chardef\directionsattribute \dogetattributeid{directions}
% experimental directions
\unexpanded\def\setdirection[#1]% todo: symbolic names
{\ctxlua{typesetters.directions.set(#1)}}
\unexpanded\def\resetdirection
%{\ctxlua{typesetters.directions.set(0)}}
{\attribute\directionsattribute\attributeunsetvalue}
\newtoks\everysetupdirections
\unexpanded\def\setupdirections[#1]% there will be more like setting up directions themselves
{\getparameters[\??di][#1]%
\the\everysetupdirections}
\chardef\directionsbidimode=0
\letvalue{\??di:bidi:\v!off }\zerocount
\letvalue{\??di:bidi:\v!global}\plusone
\letvalue{\??di:bidi:\v!local }\plustwo
\letvalue{\??di:bidi:\v!on }\plustwo
\appendtoks
\chardef\directionsbidimode\executeifdefined{\??di:bidi:\@@dibidi}\zerocount\relax
\ifcase\directionsbidimode
\resetdirection
\or
\setdirection[1]% global, chars
\or
\setdirection[2]% local, attributes
\or
\setdirection[1]% default
\fi
\to \everysetupdirections
% bidi: local=obey grouping, global=ignore grouping (unicode has no grouping)
\setupdirections % maybe start/stop
[bidi=\v!off]
\unexpanded\def\bidilre{\utfchar{"0x202A}}
\unexpanded\def\bidirle{\utfchar{"0x202B}}
\unexpanded\def\bidipop{\utfchar{"0x202C}}
\unexpanded\def\bidilro{\utfchar{"0x202D}}
\unexpanded\def\bidirlo{\utfchar{"0x202E}}
\unexpanded\def\dirlre{\ifcase\directionsbidimode\or\bidilre\or\textdir TLT\fi}
\unexpanded\def\dirrle{\ifcase\directionsbidimode\or\bidirle\or\textdir TRT\fi}
\unexpanded\def\dirlro{\ifcase\directionsbidimode\or\bidilro\or\setdirection[3]\fi}
\unexpanded\def\dirrlo{\ifcase\directionsbidimode\or\bidirlo\or\setdirection[4]\fi}
% for the moment: \setdirection[\plusone]
\protect \endinput
% bidi test
\definefontfeature
[arab]
[mode=node,language=dflt,script=arab,
init=yes,medi=yes,fina=yes,isol=yes,
liga=yes,dlig=yes,rlig=yes,clig=yes,
mark=yes,mkmk=yes,kern=yes,curs=yes]
\font\Arabic=arabtype*arab at 20pt
\def\LATIN{LATIN} {\setdirection[1]} % enable this
\def\ARAB {محمد}
\startluacode
function document.split_tokens(str)
for s in str:bytes() do
tex.sprint(tex.ctxcatcodes,string.format("\\hbox{\\char %s}",s))
end
end
\stopluacode
\def\biditest#1#2#3% font text raw
{\dontleavehmode\hbox
{\framed[offset=overlay]{\tttf#2}\quad
\enabletrackers[typesetters.directions]%
\framed[offset=overlay]{#1#3}\quad
\disabletrackers[typesetters.directions]%
\tttf\ctxlua{document.split_tokens([[\detokenize{#3}]])}}}
\startbuffer[bidi-sample]
\biditest\Arabic{LATIN BARA}{\textdir TLT\relax \LATIN\ \ARAB}\par
\biditest\Arabic{BARA LATIN}{\textdir TRT\relax \LATIN\ \ARAB}\par
\biditest\Arabic{LATIN ARAB}{\textdir TLT{\bidilro \LATIN\ \ARAB}}\par % right -> left
\biditest\Arabic{LATIN ARAB}{\textdir TRT{\bidilro \LATIN\ \ARAB}}\par % right -> left
\biditest\Arabic{BARA NITAL}{\textdir TLT{\bidirlo \LATIN\ \ARAB}}\par % left -> right
\biditest\Arabic{BARA NITAL}{\textdir TRT{\bidirlo \LATIN\ \ARAB}}\par % left -> right
\stopbuffer
\startbuffer[bidi-sample]
\biditest\Arabic{LATIN BARA}{\textdir TLT\relax \LATIN\ \ARAB}\par
\biditest\Arabic{BARA LATIN}{\textdir TRT\relax \LATIN\ \ARAB}\par
\biditest\Arabic{LATIN ARAB}{\textdir TLT\bidilro \LATIN\ \ARAB}\par % right -> left
\biditest\Arabic{LATIN ARAB}{\textdir TRT\bidilro \LATIN\ \ARAB}\par % right -> left
\biditest\Arabic{BARA NITAL}{\textdir TLT\bidirlo \LATIN\ \ARAB}\par % left -> right
\biditest\Arabic{BARA NITAL}{\textdir TRT\bidirlo \LATIN\ \ARAB}\par % left -> right
\stopbuffer
\startbuffer[bidi-setup]
\setupdirections[bidi=off]
\stopbuffer
{\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
\startbuffer[bidi-setup]
\setupdirections[bidi=global]
\stopbuffer
{\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
\startbuffer[bidi-setup]
\setupdirections[bidi=local]
\stopbuffer
{\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
\stoptext
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