[XeTeX] New version of xetex

[Vafa Khalighi]

Hi David

I just did a quick experiment with new XeTeX. Since in new TeX-XeT
algorithm, \beginR, \beginL, \endR, and \endL can also be used in math
mode, the previous approach is not needed. Here is a test file for standard
LaTeX tabular environment:

\documentclass{article}
\begin{document}
\makeatletter
\def\@tabular{\leavevmode \hbox \bgroup $\beginR\let\@acol\@tabacol
   \let\@classz\@tabclassz
   \let\@classiv\@tabclassiv \let\\\@tabularcr\@tabarray}

 \def\endtabular{\crcr\egroup\egroup \endR$\egroup}
\makeatother
\begin{tabular}{cccc}
First&Second&Third&Fourth\\
\end{tabular}
\end{document}


I will look at longtable and see if the same kind of thing can be done
there.


On Tue, Jul 29, 2014 at 10:20 PM, David Carlisle <d.p.carlisle at gmail.com>
wrote:

> On 29 July 2014 12:55, Vafa Khalighi <texpersian at gmail.com> wrote:
> >
> >
> >>
> >>
> >> If you are looking at extending xetex's RTL support is there any
> >> chance of addressing RTL tables (as affects for example longtable in
> >> the other thread)?
> >> as the nodes can only go in hmode there is no good place to put them
> >> to affect the ordering of columns in an halign.
> >>
> >
> >
> >
> > Hi David,
> >
> > The only way to make RTL \halign in TeX-XeT is to do a construct like
> >
> > \hbox{\beginR\vbox{%
> > \halign material
> > }\endR}
>
> Yes, but (as you know)  that's bad if the halign is on the main vertical
> list
> your bidi-longtable patch does as well as it can do to try to add the nodes
> in the output routine but it's not really got enough information.
>
> >
> > The parsitex change file (http://ctan.org/pkg/parsitex) which is also
> based
> > on Knuth TeX-XeT implements a \semihalign primitive that has the reverse
> > order column of \halign.
> >
> >
>
>
> That sounds good:-) an extension to flip the order of halign
> (or as you say a different primitive) would be easier to get right
> (and easier to share macro code with luatex)
>
> David
>
>
>
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