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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 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 Typesetting Macros / Directions}
%D At some point we might default to method 'two' but first I need to make it more
%D efficient (and provide some options). I also want to have some basic tracing.
\unprotect
\registerctxluafile{typo-dir}{autosuffix}
\registerctxluafile{typo-dha}{}
%registerctxluafile{typo-dua}{}
%registerctxluafile{typo-dub}{}
\registerctxluafile{typo-duc}{autosuffix}
\definesystemattribute[directions][public,pickup]
\installcorenamespace{directions}
\installcorenamespace{directionsbidimode}
% plural as we can have a combination but maybe better singular
\installsimplecommandhandler \??directions {directions} \??directions % no \define... yet
\immutable\edef\lefttorightmark{\normalUchar"200E} \aliased\let\lrm\lefttorightmark % expandable
\immutable\edef\righttoleftmark{\normalUchar"200F} \aliased\let\rlm\righttoleftmark % expandable
\permanent\protected\def\setdirection[#1]% todo: symbolic names
{\clf_setdirection#1\relax}
\permanent\protected\def\resetdirection
{\c_attr_directions\attributeunsetvalue}
\newconstant\directionsbidimode % this one might become pivate
% \setupdirections[bidi=global,method=default]
% \setupdirections[bidi=global,method=one]
% \setupdirections[bidi=global,method=two]
% \setupdirections[bidi=global,method=two,fences=no]
% maybe use chardefs
\mutable\lettonothing\currentbidimode
\mutable\lettonothing\currentbidistamp
\def\typo_dir_get_mode
{\def\currentbidimode{\clf_getbidimode % test edef
scope {\directionsparameter\c!bidi}%
method {\directionsparameter\c!method}%
fences {\directionsparameter\c!fences}%
}%
\gletcsname\??directionsbidimode\currentbidistamp\endcsname\currentbidimode}
\appendtoks
\edef\p_bidi{\directionsparameter\c!bidi}%
\edef\currentbidistamp
{\p_bidi
:\directionsparameter\c!method
:\directionsparameter\c!fences}%
\expandafter\let\expandafter\currentbidimode\csname\??directionsbidimode\currentbidistamp\endcsname
\ifrelax\currentbidimode
\typo_dir_get_mode
\fi
\directionsbidimode\currentbidimode\relax
\ifcase\directionsbidimode
\resetdirection
\else
\setdirection[\number\directionsbidimode]%
\fi
\ifx\p_bidi\v!global
\pickupdirectionsattribute % pagebuilder
\else
\forgetdirectionsattribute
\fi
\to \everysetupdirections
\appendtoks
\edef\p_option{\directionsparameter\c!break}% name can change
\bitwiseflip\normalizelinemode\ifx\p_option\v!both\else-\fi\breakafterdirnormalizecode
\to \everysetupdirections
% bidi: local=obey grouping, global=ignore grouping (unicode has no grouping)
\setupdirections % maybe start/stop
[\c!bidi=\v!off,
\c!method=\v!default,
\c!break=\v!both, % experimental value, maybe \v!no will be default (bad name too)
\c!fences=\v!yes]
\permanent\protected\edef\bidilre{\normalUchar"202A}
\permanent\protected\edef\bidirle{\normalUchar"202B}
\permanent\protected\edef\bidipop{\normalUchar"202C}
\permanent\protected\edef\bidilro{\normalUchar"202D}
\permanent\protected\edef\bidirlo{\normalUchar"202E}
\permanent\protected\def\dirlre{\ifcase\directionsbidimode\or\bidilre\or\textdirection\directionlefttoright\fi}
\permanent\protected\def\dirrle{\ifcase\directionsbidimode\or\bidirle\or\textdirection\directionrighttoleft\fi}
\permanent\protected\def\dirlro{\ifcase\directionsbidimode\or\bidilro\or\setdirection[3]\fi}
\permanent\protected\def\dirrlo{\ifcase\directionsbidimode\or\bidirlo\or\setdirection[4]\fi}
% for the moment: \setdirection[\plusone]
\definecolor[bidi:left:original] [r=.6]
\definecolor[bidi:left:reversed] [g=.6]
\definecolor[bidi:right:original][b=.6]
\definecolor[bidi:right:reversed][r=.6,g=.6]
\definecolor[bidi:mirrored] [r=.6,b=.6]
\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 {عربي}
%
% \startluacode
% function documentdata.split_tokens(str)
% for s in str:bytes() do
% context.sprint(tex.ctxcatcodes,string.format("\\hbox{\\char %s}",s))
% end
% end
% \stopluacode
%
% \protected\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{documentdata.split_tokens([[\detokenize{#3}]])}}}
%
% \startbuffer[bidi-sample]
% \biditest\Arabic{LATIN BARA}{\lefttoright\relax \LATIN\ \ARAB}\par
% \biditest\Arabic{BARA LATIN}{\righttoleft\relax \LATIN\ \ARAB}\par
% \biditest\Arabic{LATIN ARAB}{\lefttoright{\bidilro \LATIN\ \ARAB}}\par % right -> left
% \biditest\Arabic{LATIN ARAB}{\righttoleft{\bidilro \LATIN\ \ARAB}}\par % right -> left
% \biditest\Arabic{BARA NITAL}{\lefttoright{\bidirlo \LATIN\ \ARAB}}\par % left -> right
% \biditest\Arabic{BARA NITAL}{\righttoleft{\bidirlo \LATIN\ \ARAB}}\par % left -> right
% \stopbuffer
%
% \startbuffer[bidi-sample]
% \biditest\Arabic{LATIN BARA}{\lefttoright\relax \LATIN\ \ARAB}\par
% \biditest\Arabic{BARA LATIN}{\righttoleft\relax \LATIN\ \ARAB}\par
% \biditest\Arabic{LATIN ARAB}{\lefttoright\bidilro \LATIN\ \ARAB}\par % right -> left
% \biditest\Arabic{LATIN ARAB}{\righttoleft\bidilro \LATIN\ \ARAB}\par % right -> left
% \biditest\Arabic{BARA NITAL}{\lefttoright\bidirlo \LATIN\ \ARAB}\par % left -> right
% \biditest\Arabic{BARA NITAL}{\righttoleft\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]}
%
% \startbuffer[bidi-sample]
% \setupdirections[bidi=global]
%
% \hbox{\righttoleft\arabicfont (0001)}\par
% \dontleavehmode\hbox{\righttoleft\arabicfont (0002)}\par
% {\righttoleft\arabicfont (0003)\par}
% {\righttoleft\arabicfont (0004)}\par
% \dontleavehmode{\righttoleft\arabicfont (0005)\par}
% \dontleavehmode{\righttoleft\arabicfont (0006)}\par
% \rtlhbox{\arabicfont (0007)}\par
% \ltrhbox{\arabicfont (0008)}\par
% \dontleavehmode\rtlhbox{\arabicfont (0009)}\par
% \dontleavehmode\ltrhbox{\arabicfont (0010)}\par
% \stopsetups
%
% {\typebuffer[bidi-sample] \getbuffer[bidi-sample]}
%
% \stoptext
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