[XeTeX] xetex and the unicode bidirectional algorithm.
Jonathan Kew
jfkthame at googlemail.com
Thu Dec 5 16:52:29 CET 2013
On 5/12/13 12:48, C. Scott Ananian wrote:
> Can anyone point me to docs on XeT--TeX? A Google the other day failed
> to turn up anything useful.
>
(TeX--XeT, not XeT--TeX.)
This is part of e-TeX; see the e-TeX manual[1], section 4.1.
HTH,
JK
[1] http://tug.ctan.org/systems/e-tex/v2/doc/etex_man.pdf
> Also: polyglossia appears to be doing some amount of LTR/RTL
> directionality switching based on the character block. Can anyone offer
> advice on how to avoid fighting with that, if I'm implementing my own
> bidi algorithm?
>
> Finally: any advice on using CJK languages with polyglossia? Embedded
> CJK is quite common. Should I be writing gloss-ja etc files to set the
> right directionality and font and get the appropriate CJK support
> packages loaded?
> --scott
>
> On Dec 5, 2013 5:42 AM, "Jonathan Kew" <jfkthame at googlemail.com
> <mailto:jfkthame at googlemail.com>> wrote:
>
> On 4/12/13 13:24, C. Scott Ananian wrote:
>
> The goal is to match the Unicode bidi algorithm, because that is
> how the
> web page displays and thus how the original author saw the text
> as they
> wrote.
>
>
> This would be a nice enhancement, but would require a significant
> amount of work (or in other words, it's not likely to get
> implemented quickly, if at all).
>
> Currently, typesetting bidi text with xetex requires correct use of
> the TeX--XeT bidi commands (\beginR, \endR, \beginL, \endL) to mark
> up the text direction. These could be used directly, or via
> higher-level markup that's tagging script and language, but you
> definitely need them to be present in some way.
>
> Sorry, that's not what you want to hear, but it's how things are. At
> this point, I think the most practical way forward in your situation
> is probably to implement this as part of whatever tool is taking the
> wikipedia content and converting it to (Xe)LaTeX markup - that tool
> could inspect the content of each element it's processing, and add
> any necessary direction controls for XeTeX.
>
> JK
>
> Guessing the proper language tag to use is likely infeasible;
> note that the example given contains titles in Turkish as well as
> English. The safest option is probably to treat embedded LTR
> text in an
> RTL context as 'exotic' and not to attempt hyphenation.
>
> I've heard it said that LuaTeX has "better bidi support". What does
> that mean, exactly? Should I be considering switching?
> --scott
>
> On Dec 4, 2013 4:08 AM, "Keith J. Schultz"
> <schultzk at uni-trier.de <mailto:schultzk at uni-trier.de>
> <mailto:schultzk at uni-trier.de <mailto:schultzk at uni-trier.de>>__>
> wrote:
>
> Hi Scott,
>
> Am 03.12.2013 um 19:42 schrieb C. Scott Ananian
> <cscott at cscott.net <mailto:cscott at cscott.net>
> <mailto:cscott at cscott.net <mailto:cscott at cscott.net>>>:
>
> >
> > But in the XeLaTeX/polyglossia/bidi output, the "soft
> space" weak
> > directionality of the Unicode BiDi algorithm doesn't
> seem to be
> > honored (or implemented?) and so the English article
> titles appear
> > with the individual words in RTL order, which is a mess.
> Manually
> > tagging the language of the article title is probably
> the Right
> thing,
> > but infeasible for the entire wikipedia.
> Well, without proper tagging you can not expect
> any system to
> work properly or as expected!
> For most entries a simple script should do the
> trick to add the
> language tags to the article titles.
>
> Hope this helps
> regards
> Keith.
>
>
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