From: Amit Aronovitch <aronovitch@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-bidi@gnu.org, emacs-devel@gnu.org, Kenichi Handa <handa@m17n.org>
Subject: Re: Re: Arabic support
Date: Sat, 28 Aug 2010 13:15:44 +0300 [thread overview]
Message-ID: <AANLkTinFrEnuW=oPeBqg6=wYegbrR+Lani2WcmDYstVO@mail.gmail.com> (raw)
In-Reply-To: <83bp8oml9c.fsf@gnu.org>
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On Fri, Aug 27, 2010 at 12:56 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > From: Kenichi Handa <handa@m17n.org>
> > Date: Thu, 26 Aug 2010 10:10:05 +0900
> >
> > I've just committed changes to trunk for Arabic shaping. If
> > there're any Arabic users in this list, please check the
> > displaying of Arabic text. On GNU/Linux system, you must
> > compile Emacs with libotf and m17n-lib (configure script
> > should detect them automatically).
>
> Thanks. However, today's build behaves very strangely in a GUI
> session on MS-Windows. For starters, cursor motion seems to jump
> across many characters in the "Arabic" line of etc/HELLO. For
> example, typing C-f in that line, I first move one character at a time
> across "Arabic", as expected, then the cursor jumps to the right paren
> of the leftmost parenthesized part, again as expected, and then I see
> the following strange behavior:
>
> . C-f moves one character to the left, to buffer position 758, as
> expected.
>
> . the next C-f jumps across many characters on the screen and lands
> on position 764.
>
> . another C-f jumps to what is reported as position 765, but on the
> screen those are several characters, maybe 5 or 6.
>
> . another C-f moves to the left paren at position 766, as expected.
>
> . yet another C-f moves to position 767, but on the screen the
> cursor jumps back into one of the characters it jumped across when
> it landed on position 765 two C-f keypresses earlier.
>
> . if I type C-b 4 times from this point, I enter a "trap", whereby
> typing C-b jumps between two characters, whose buffer positions
> are 764 and 765. The only way to get out of the trap is with C-a
> or C-e or C-f.
>
> I don't read Arabic, so I cannot really say whether any of this is
> expected behavior. (The "trap" with C-b is certainly not the expected
> behavior.) Do you see anything similar on X?
>
>
1) I confirm that Arabic shaping seems to work fine on my build (27/8/10
rev. 101200, on Linux+X (Debian unstable)).
2) Logical movement with C-f/C-b in the hello file seems fine (I do not see
the trap described above).
3) My Arabic is very basic, and I am not familiar with Arabic computing
(keyboards etc.) - I noticed the following points, but I am not sure what is
the expected behavior (I can only compare to other programs - gedit in this
case):
a) Column numbers (column-number-mode) behave strangely (I suspect that
m17n-lib's invisible markup consume column numbers). For example as you move
using C-f in the word "هذا" column numbers go through "0,1,4,5" (i.e. the
second character takes up 3 columns). If I change that to "بهذا", the column
positions are "0,1,4,6,7" (the second and third chars take up 3 and 2
columns resp.?).
In gedit column positions are 1 character per column and do not depend on
the shaping.
b) Arabic keyboard has the ligature "Lam-Alef" (U+FEFB) on the key marked
"B" in qwerty keyboards. When I type this in emacs, I get Lam and Alef
(which are auto-shaped correctly as the proper ligature). C-d when cursor is
on the ligature erases the Alef and another C-d erases the Lam. This seems
like proper behavior to me. However, in gedit, the "B" key produces a
(U+FEFB) which is always displayed as a ligature, deleted in a single Del
press, and never connected to previous character. Cut and pasting this into
emacs, I get a similar behavior there.
The question is: do Arabic users expect to be able to produce this "stiff"
ligature? Is the behavior of gedit a bug? Should the emacs "Lam-Alef" key
behave as it does (i.e. produce two characters)?
thanks,
Amit Aronovitch
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next prev parent reply other threads:[~2010-08-28 10:15 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-26 1:10 Arabic support Kenichi Handa
2010-08-27 9:56 ` Eli Zaretskii
2010-08-28 10:15 ` Amit Aronovitch [this message]
2010-08-29 5:07 ` James Cloos
2010-08-29 5:13 ` James Cloos
2010-08-30 2:07 ` Kenichi Handa
2010-08-30 13:42 ` Amit Aronovitch
2010-08-30 14:11 ` [emacs-bidi] " Amit Aronovitch
2010-09-03 7:35 ` Kenichi Handa
2010-09-03 7:54 ` [emacs-bidi] " Amit Aronovitch
2010-09-01 2:55 ` Kenichi Handa
2010-09-01 4:58 ` Eli Zaretskii
2010-09-01 5:06 ` Kenichi Handa
2010-09-01 7:12 ` [emacs-bidi] " Stefan Monnier
2010-09-03 7:17 ` Kenichi Handa
2010-08-30 7:47 ` Kenichi Handa
2010-08-30 14:06 ` Eli Zaretskii
2010-09-01 2:17 ` Kenichi Handa
2010-09-01 3:47 ` "Martin J. Dürst"
2010-09-02 7:45 ` 大嶋 俊祐
2010-09-02 9:31 ` Eli Zaretskii
2010-09-02 12:58 ` "Martin J. Dürst"
2010-09-02 14:13 ` [emacs-bidi] " Eli Zaretskii
2010-09-01 6:11 ` Eli Zaretskii
2010-09-01 7:08 ` Kenichi Handa
2010-09-01 17:55 ` Eli Zaretskii
2010-09-02 2:13 ` Jason Rumney
2010-09-02 11:53 ` Eli Zaretskii
2010-09-02 12:00 ` Eli Zaretskii
2010-09-02 13:09 ` [emacs-bidi] " Jason Rumney
2010-09-02 14:29 ` Eli Zaretskii
2010-09-02 14:37 ` [emacs-bidi] " Jason Rumney
2010-09-02 13:01 ` Kenichi Handa
2010-09-02 14:04 ` Eli Zaretskii
2010-09-03 1:00 ` Kenichi Handa
2010-09-03 9:16 ` Eli Zaretskii
2010-09-03 10:18 ` David Kastrup
2010-09-03 11:08 ` Kenichi Handa
2010-09-03 14:54 ` Eli Zaretskii
2010-09-03 13:25 ` Eli Zaretskii
2010-09-03 14:32 ` Amit Aronovitch
2010-09-03 14:43 ` Eli Zaretskii
2010-09-04 7:13 ` Eli Zaretskii
2010-09-06 6:04 ` Kenichi Handa
2010-09-04 15:29 ` Eli Zaretskii
2010-09-02 13:48 ` Jason Rumney
2010-09-02 14:49 ` Eli Zaretskii
2010-09-06 13:45 ` Thamer Mahmoud
2010-09-07 4:22 ` TAKAHASHI Naoto
[not found] <1827180050.2494591283218749909.JavaMail.root@zimbra3-e1.priv.proxad.net>
2010-08-31 1:41 ` mhibti
2010-08-31 16:51 ` Eli Zaretskii
[not found] <1796465189.722121283821151613.JavaMail.root@zimbra3-e1.priv.proxad.net>
2010-09-07 0:59 ` mhibti
2010-09-07 3:03 ` Eli Zaretskii
[not found] <1648279726.724291283830418269.JavaMail.root@zimbra3-e1.priv.proxad.net>
2010-09-07 3:34 ` mhibti
2010-09-07 4:39 ` Eli Zaretskii
[not found] <1934111520.880681283871336127.JavaMail.root@zimbra3-e1.priv.proxad.net>
2010-09-07 15:08 ` mhibti
2010-09-13 6:40 ` Eli Zaretskii
2010-09-16 2:07 ` Kenichi Handa
2010-09-22 3:54 ` Kenichi Handa
2010-09-22 7:33 ` Eli Zaretskii
2010-09-22 12:27 ` Thamer Mahmoud
2010-09-27 5:56 ` Kenichi Handa
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