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Re: [emacs-bidi] Re: merge emacs-bidi into the main tree
From: |
Kenichi Handa |
Subject: |
Re: [emacs-bidi] Re: merge emacs-bidi into the main tree |
Date: |
Tue, 12 Aug 2003 16:18:12 +0900 (JST) |
User-agent: |
SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/21.2.92 (sparc-sun-solaris2.6) MULE/5.0 (SAKAKI) |
In article <address@hidden>, "Eli Zaretskii" <address@hidden> writes:
>> In brief, what I did in emacs-bidi are:
>>
>> (1) change xdisp.c to call get_next_display_element_visually
>> and set_iterator_to_next_visually instead of
>> get_next_display_element and set_iterator_to_next.
>>
>> (2) make a new file bidi.c that implements
>> get_next_display_element_visually and
>> set_iterator_to_next_visually.
>>
>> (3) make a new file bidi.el that implements simple
>> bidi-reordering function that is called from
>> get_next_display_element_visually to create a cache in
>> (struct it).
>>
>> (4) change xterm.c to display glyphs flushing to right when
>> orientation-reversed is non-nil.
>>
>> My current plan is to replace (2) and (3) with Eli's code.
> It's not gonna be that simple ;-)
[...]
> (To save future work, some crucial information about the characters
> over which we scan is cached inside the bidi_it struct, to facilitate
> processing later when we need to go back to those characters and
> generate the glyph matrix elements from them. So, in the above
> example, going back from 'D' to 'A' boils down to delivering
> information already cached during the forward scan.)
Then, it seems that what you've done is not that different
from the current emacs-bidi. In most cases, we anyway move
the iterator all over "abcdABCDefg". Your code caches only
some crucial information, so get_next_display_element will
need some work at C B A e f g. My code caches all
information given by get_next_display_element, so
get_next_display_element will work fast at C B A e f g.
In both cases, set_iterator_to_next (your code) and
set_iterator_to_next_visually (my code) moves IT_CHARPOS
(*it) non-linearly.
So, I still think incorporating your code is not that difficult.
> (There still needs to be more code in the terminal-specific parts of
> Emacs, that displays the glyphs either starting at the left or the
> right margin of the screen/window, depending on the current
> paragraph's base direction; the latter gets decided by subroutines of
> bidi_get_next_char_visually and is stored in the bidi_it structure. I
> believe this code, at least for the X terminals, already largely
> exists in m17n.org's emacs-bidi.)
Yes. "(4) change xterm.c" does that.
---
Ken'ichi HANDA
address@hidden
- [emacs-bidi] Re: merge emacs-bidi into the main tree, (continued)
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Gerd Moellmann, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Eli Zaretskii, 2003/08/10
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Gerd Moellmann, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Eli Zaretskii, 2003/08/10
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Gerd Moellmann, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Stefan Monnier, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Kenichi Handa, 2003/08/11
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Eli Zaretskii, 2003/08/12
- Re: [emacs-bidi] Re: merge emacs-bidi into the main tree,
Kenichi Handa <=
- Re: [emacs-bidi] Re: merge emacs-bidi into the main tree, Eli Zaretskii, 2003/08/12
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Gerd Moellmann, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Eli Zaretskii, 2003/08/10
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Gerd Moellmann, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Nadim Shaikli, 2003/08/09
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Nadim Shaikli, 2003/08/11
- [emacs-bidi] Re: merge emacs-bidi into the main tree, Richard Stallman, 2003/08/13