[luatex] Info on direction primitives/implementation

Joseph Wright joseph.wright at morningstar2.co.uk
Tue Dec 4 11:57:57 CET 2012

On 04/12/2012 09:19, Paul Isambert wrote:
> Le 04/12/2012 09:47, Joseph Wright a écrit :
>> Hello all,
>> I'm currently taking a look at the approaches used for RTL typesetting
>> in pdfTeX/XeTeX/LuaTeX. In pdfTeX/XeTeX, the TeX--XeT approach is used
>> and this is documented in the e-TeX manual (as far as I know, neither
>> engine does anything other than adopt the e-TeX code). On the other
>> hand, LuaTeX uses the Omega approach, or at least some of the same
>> interfaces. However, reading the LuaTeX manual I've not got a clear
>> picture of the detail. Is there some documentation on the way RTL (etc.)
>> is implemented in LuaTeX? (I've also failed to find an Omega manual to
>> see if there might be any help there. But even if I could, I'm guessing
>> the code may have been modified.)
> Here's, at least, the Omega manual:
> http://stuff.mit.edu/afs/athena/astaff/source/src-9.0/third/tetex/texmf/doc/omega/base/omega-manual.pdf
> If you ever find anything substantial, I'd be glad to know!
> Best,
> Paul

Thanks for that.

Reading the LuaTeX manual again, I spot section 9.4 ('Changes from ALEPH
RC4') which gives a few more clues, at least with regard to directions
supported (Latin, Arabic, CJK, Monoglian only). So perhaps I need an
Aleph manual too :-)
Joseph Wright

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