Re: [icu-design] Arabic Shaping and Presentation Forms

[mehran m. <meh...@gm...>]

So, please fix the Unicode standard.

On 9/23/06, Kent Karlsson <ken...@co...> wrote:
>
> > I'm looking into Jitterbug 3882. This bug says, among other things:
> >
> > > Currently, when asking the shaper to shape Arabic letters
> > > (to presentation forms for Arabic), it maps (some) presentaion
> > > form Arabic letters in the input to nominal Arabic characters,
> > > and then reshapes them.
> > >
> > > Arabic letters that are already in presentation form must
> > > be left UNTOUCHED by the shaper and not cause linking of
> > > adjancent nominal Arabic letters. I.e., it is only the
> > > "unshaper" that should change preshaped Arabic letters,
> > > NOT the shaper.
> >
> > It's not clear to me off the top of my head that this is really the
> > correct behavior.
>
> As mentioned in the bug report, only the nominal letters have
> non-default shaping properties in Unicode. The presentation
> form Arabic letters all have the (default) shaping property
> "U; <no shaping>", where "U" stands for "non-joining". I.e.
> they do not alter (joining) shape by context, nor do they cause
> joining in adjacent nominal letters. This would apply not only
> to rendering system (font plus supporting software) behaviour,
> but also to this "map to preshaped characters if possible" function.
>
>         /kent k
>
>
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