Re: [NTG-context] Luatex (actually Aleph) and Bidi_Mirrored chars in RTL mode

15 Jun 2008

      On Sun, 15 Jun 2008 14:32:40 -0600, Hans Hagen  wrote:
...
currently there is no reset command but you can say
\setcharactermirroring[-1]
since -1 resets an attribute
I tried that, but the result is the same: first occurrence of an RL  
open-paren in an LR paragraph is mis-mirrored. Next occurrences are fine.

The enclosed test file can serve as a benchmark for now.

Best
Idris

=============mirroring.tex==============
% engine=luatex

% OpenType features needed for Arabtype font
\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 19pt

\def\ArabicParDir{\textdir TRT\pardir TRT}
\def\ArabicTextDir{\textdir TRT}
\def\LatinParDir{\textdir TLT\pardir TLT}
\def\LatinTextDir{\textdir TLT}

\definestartstop
   [arabicpar]
   [commands=%
     {\Arabic
	 \ArabicParDir
	 \setcharactermirroring[1]%
	 }]

\definestartstop
   [arabictext]
   [commands=%
     {\Arabic\setcharactermirroring[1]
     \ArabicTextDir
	%
	}]

\definestartstop
   [latinpar]
   [commands=%
     {\Arabic\LatinParDir
     \setcharactermirroring[-1]%
     }]	

\definestartstop
   [latintext]
   [commands={\LatinTextDir
   \setcharactermirroring[-1]%
   }]	

\setupwhitespace[big]

\showframe[text]

\starttext
\startarabicpar
سلام (قوس) وقوس <قوس> و [قوس]

وهذا قوس حول نص غير عربي
\startlatintext(Latin)\stoplatintext\ ثم عربي  \crlf
وهذا قوس حول نص غير عربي
\startlatintext(Latin)\stoplatintext\ ثم عربي  \crlf
وهذا قوس حول نص غير عربي
\startlatintext(Latin)\stoplatintext\ ثم عربي

\stoparabicpar

\blank

\startlatinpar
Peace (paren) \& [paren] \& <paren>

Here is some mixed Arabic
{\startarabictext(عربي)\stoparabictext} \ and Latin script. \crlf
Here is some mixed Arabic
{\startarabictext(عربي)\stoparabictext} \ and Latin script. \crlf
Here is some mixed Arabic
{\startarabictext(عربي)\stoparabictext} \ and Latin script.

As you can see, \LUATEX\ does a very good job mixing LR
\startarabictext(يسار-يمين)\stoparabictext \
and RL
\startarabictext(يمين-يسار)\stoparabictext \
texts. \crlf
As you can see, \LUATEX\ does a very good job mixing LR
\startarabictext(يسار-يمين)\stoparabictext \
and RL
\startarabictext(يمين-يسار)\stoparabictext \
texts.  \crlf
As you can see, \LUATEX\ does a very good job mixing LR
\startarabictext(يسار-يمين)\stoparabictext \
and RL
\startarabictext(يمين-يسار)\stoparabictext \
texts.

% \hfill\break temporary workaround for luatex bug

\LUATEX\ even does a great job breaking Arabic phrases \startarabictext(و  
هنا جملة منقطعة في وسط قرينة لاتينية)\stoparabictext \ across lines.  
\hfill\break
\LUATEX\ even does a great job breaking Arabic phrases \startarabictext(و  
هنا جملة منقطعة في وسط قرينة لاتينية)\stoparabictext \ across lines.   
\hfill\break
\LUATEX\ even does a great job breaking Arabic phrases \startarabictext(و  
هنا جملة منقطعة في وسط قرينة لاتينية)\stoparabictext \ across lines.

(bracket) and <bracket> and [bracket]

\stoplatinpar

\stoptext
========================================

-- 
Professor Idris Samawi Hamid, Editor-in-Chief
International Journal of Shi`i Studies
Department of Philosophy
Colorado State University
Fort Collins, CO 80523