[Dev-luatex] Modifying the LuaTeX Engine

Yannis Haralambous yannis.haralambous at telecom-bretagne.eu
Sat Dec 27 19:56:15 CET 2008

"automatic direction change" is actually what we call "bidi  
algorithm". Unicode provides special characters for explicitly  
changing direction when the automatic direction change is not  
sufficient. OTPs cannot do it because they give up on every token  
which is not a character with specific catcodes.

Le 27 déc. 08 à 17:35, وفا خلیقی، Vafa Khalighi a écrit :

> The fact automatic direction change is hardcoded is a serious
> drawback, and not and advantage, imo. There are many subtle
> points in bidi typesetting which can be addressed only in a
> programmable environment, like that provided by luatex. Even
> with otps, which are very limited as compared with luatex, I
> managed to implement a preliminary automatic direction change
> (in fact, an automatic script change, including direction).
> I believe the automatic direction change is the main advantage  
> otherwise typesetting with TeX is unnatural and useless.
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