[luatex] Info on direction primitives/implementation

Paul Isambert zappathustra at free.fr
Tue Dec 4 10:19:07 CET 2012

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:

If you ever find anything substantial, I'd be glad to know!


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