# [Dev-luatex] Modifying the LuaTeX Engine

Taco Hoekwater taco at elvenkind.com
Thu Dec 25 09:10:28 CET 2008

```وفا خلیقی، Vafa Khalighi wrote:
>
>
> Now it has
> been some time that I have been studying the TeX-e-Parsi engine and have
> studied the changes that they have done in the actual TeX engine.
>
> TeX-e-Parsi is a localised version of TeX which has perfect bidirectional
> support and I hope that we can make these changes in the LuaTeX engine so we
> have perfect bidirectional support.

The Omega code where the direction support in luatex comes from is
so can you please explain why and how TeX-e-Parsi is better?

> TeX-e-Parsi adds about 100 Prmitive commands to the Original TeX primitive
> commands. I think we would not need all of these 100 commands but we will
> need the commands that have something to do with the directions.

Due to lack of comments in the tex.ch file I cannot even ascertain
which of the 100 commands deal with directions. Before I can say