Re: [emacs-bidi] Hebrew characters categories

[TAKAHASHI Naoto]

"Yair Friedman (Jerusalem)" writes:

> Things seems to be more complex than I estimated before. It took me
> some time to understand that composition heavily relay on character
> categories.

Composition is independent of categories.  You can compose characters
without using categories at all.  Never mind those categories designed
for Thai and Lao; they were defined because they help composition in
those languages.  You do not have to use them for Hebrew.

> If Emacs will continue with the mixed approach, then we would need 13
> categories for Hebrew, most of them new.

Create any categories if you think they are necessary for Hebrew.  Do
not create any categories if you can do without them.

> What is the approach taken in Arabic?

For positioning, no new categories are defined.  Since Arabic vowel
signs and other marks are aligned to centre, all we have to worry is
whether they are placed above the base character or below.  Such
vertical positioning is automatically done by the display engine,
based on the glyph information stored in the font file.

-- 
TAKAHASHI Naoto
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http://www.m17n.org/ntakahas/