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Date:         Thu, 14 May 2009 15:21:27 +0930
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From: Will Robertson <wspr81@GMAIL.COM>
Subject: Re: grouping in array.sty internal macros
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <7ac5ed450905130058n6178e8beoc7daacc45996f6ce@mail.gmail.com>
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On 13/05/2009, at 5:28 PM, Vafa Khalighi wrote:

> I did a hack to make tabular in array.sty RTL and this is what I  
> have done

[snip]

> Please note that in RTL we both want the order of columns to be RTL  
> and each entry in each cell to be RTL.

[snip]

Hi Vafa (and others),

Tweaking the code for a while resulted in something that's working, I  
think. The minimal example appended might help you get it working.  
(I'm not really sure where your original problem was coming from,  
though; I seem to have done basically the same thing as you. No time  
to look more closely, though.)

Hope this helps,
Will

P.S.  Note that I didn't find it necessary to include the outer  
\beginR..\endR around the dollar signs; you might be able to omit it  
in your other code as well.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{article}
\usepackage{array}
\makeatletter
\TeXXeTstate=1

\def\tabular{\gdef\@halignto{}\@tabular}
\def\@tabular{%
   \leavevmode
   \hbox\bgroup
     $%
     \@tabularinit
     \@array
}

\renewcommand\@array[2][c]{%
     \@tempdima \ht \strutbox
     \advance \@tempdima by\extrarowheight
     \setbox \@arstrutbox \hbox{%
       \vrule \@height \arraystretch \@tempdima
              \@depth  \arraystretch \dp \strutbox
              \@width  \z@
     }%
     \begingroup
       \@mkpream{#2}%
       \xdef\@preamble{%
         \noexpand \ialign \@halignto
         \bgroup \@arstrut \@preamble
           \tabskip \z@ \cr
       }%
     \endgroup
     \@arrayleft
     \if #1t\vtop \else \if#1b\vbox \else \vcenter \fi \fi
     \bgroup
       \@arrayinit
       \hbox\bgroup\beginR\vbox\bgroup
         \@preamble
           % indent
}
%% environment body goes here
\def\endtabular{%
           \crcr
         \egroup % \bgroup from \@preamble
       \egroup\endR\egroup % \vbox\hbox
     \egroup
     \gdef\@preamble{}%
     $%
   \egroup % original \hbox
}

\def\@tabularinit{%
     \col@sep\tabcolsep
     \let \d@llarbegin \begingroup
     \let \d@llarend \endgroup
}
\def\@arrayinit{%
     \let \@sharp ##
     \let \protect \relax
     \lineskip \z@
     \baselineskip \z@
     \m@th
     \let \\ \@arraycr
     \let \tabularnewline \\%
     \let \par \@empty
}

\makeatother
\begin{document}
\begin{tabular}{|l|l|}\hline
vafa khalighi&shahrzad khalighi\\ \hline
\end{tabular}
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


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