[XeTeX] New version of xetex

[David Carlisle]

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