John Plaice writes: > how long until 21.2 support? Depends on Handa's available time. Unfortunately, we are very busy until the end of July. -- -- TAKAHASHI Naoto ntakahas <at> m17n.org http://www.m17n.org/ntakahas/
Takahashi-san, first and foremost thank you again for your help and
interest in Arabic and the various issues there-in. A couple of
things;
1. I'm attaching a very simple patch against what's currently hanging
of the FTP site that makes some minor modifications and corrects
a couple of encodings - do please apply it.
2. Regarding the "simplified" Bidi, could I suggest the following
rather simple addition. Pseudo-code would get the point across
simpler.
if ( first_char_is_RTL )
Assume entire line is Right-To-Left
else
/* default */
Assume entire line is Left-To-Right
first_char_is_RTL
{
/* Look at the first character within a line to see and
note its encoding, skip all punctuations (ie. '-', '+',
'*', etc)
*/
if (first_char is punctuation )
first_char = get_next_char;
if (
(first_char <= 0x060C && first_char >= 0x0670) ||
(first_char <= 0xfe70 && ...)
(Continue reading)
On Tue, 2 Jul 2002, Nadim Shaikli wrote:
> Takahashi-san, first and foremost thank you again for your help and
> interest in Arabic and the various issues there-in.A couple of
> things;
>
> 1. I'm attaching a very simple patch against what's currently hanging
> of the FTP site that makes some minor modifications and corrects
> a couple of encodings - do please apply it.
>
> 2. Regarding the "simplified" Bidi, could I suggest the following
> rather simple addition. Pseudo-code would get the point across
> simpler.
>
> if ( first_char_is_RTL )
> Assume entire line is Right-To-Left
> else
> /* default */
> Assume entire line is Left-To-Right
Generally, it would be best to reorder paragraphs rather than lines.
Reordering lines wil give some strange results in case a line in the
middle of a paragraph happens to start with a character of the "other"
directionality (e.g: a number or english letter in the middle of a hebrew
paragraph).
Also note that you should generally scan the {line|paragraph|whatever} for
the first char that has strong "directionality".
--
--
(Continue reading)
--- Tzafrir Cohen wrote:
> On Tue, 2 Jul 2002, Nadim Shaikli wrote:
>
> > 2. Regarding the "simplified" Bidi, could I suggest the following
> > rather simple addition. Pseudo-code would get the point across
> > simpler.
> >
> > if ( first_char_is_RTL )
> > Assume entire line is Right-To-Left
> > else
> > /* default */
> > Assume entire line is Left-To-Right
>
> Generally, it would be best to reorder paragraphs rather than lines.
> Reordering lines wil give some strange results in case a line in the
> middle of a paragraph happens to start with a character of the "other"
> directionality (e.g: a number or english letter in the middle of a hebrew
> paragraph).
>
> Also note that you should generally scan the {line|paragraph|whatever} for
> the first char that has strong "directionality".
That would take it outside the realm of simplicity 
For what its worth,
personally I'd be willing to live with the "oddity" of have a line within a
paragraph orient itself in the other direction.
My $0.02's worth.
- Nadim
(Continue reading)
On Tue, 2 Jul 2002, Nadim Shaikli wrote: > 2. Regarding the "simplified" Bidi, could I suggest the following > rather simple addition. Pseudo-code would get the point across > simpler. > > if ( first_char_is_RTL ) > Assume entire line is Right-To-Left > else > /* default */ > Assume entire line is Left-To-Right I cannot say I like this approach. In my experience, it yields dreadfully wrong results in many practical cases. (MS-Windows implements something very similar.) > 3. Your comment about "Handa's available time" pertains to modifying > the code to upload this to emacs' live CVS ? In other words, this > work/effort will make it to emacs' proper repository, correct ? The entire approach to the bidi reordering that Handa-san wrote several years ago was more or less rejected by Gerd Moellmann, who was very unhappy about the way the code caches characters/glyphs before reordering them. Gerd was convinced that this will slow down the display engine to an unbearable degree. That is why Handa-san's code was never added to Emacs, although it exists for quite some time now.(Continue reading)
--- Eli Zaretskii wrote: > > On Tue, 2 Jul 2002, Nadim Shaikli wrote: > > > 2. Regarding the "simplified" Bidi, could I suggest the following > > rather simple addition. Pseudo-code would get the point across > > simpler. > > > > if ( first_char_is_RTL ) > > Assume entire line is Right-To-Left > > else > > /* default */ > > Assume entire line is Left-To-Right > > I cannot say I like this approach. In my experience, it yields > dreadfully wrong results in many practical cases. (MS-Windows implements > something very similar.) It certainly wouldn't be perfect, but as a simplified hack/approach it might serve to be useful. For the various documents that I'm holding on to, this approach would serve it very well (my perl hacks note that at least(Continue reading)
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