On 26/02/2021 22:44, Yannis Haralambous wrote:
Le 26 févr. 2021 à 23:37, Jonathan Kew <[email protected]
<mailto:[email protected]>> a écrit :
On 26/02/2021 22:00, Yannis Haralambous wrote:
dear TeX-hyphen members,
I'm new to this list (although not necessarily new to TeX hyphenation :-)
Here is the problem: we are preparing hyphenation patterns for
Uyghur, written in Arabic script.
As letters must be in initial/medial form before the hyphen and
medial/final form on the next line begin,
I was wondering if we could change TeX internals so that instead of
one, three hyphenchars are used:
^^^^200d and `-' on the upper line and ^^^^200d on the lower line, in
order to obtain the equivalent
of \discretionary{^^^^200d-}{^^^^200d}{}
Hi Jonathan,
The problem with this is that it wouldn't be the appropriate
\discretionary in the case where the letter before the hyphenation
position is a right- (rather than dual-) joining character.
Sorry I don't understand what you mean. You mean when it is a biform
character like the waw or the ra? In that case the ZWJ will do no harm.
It is an invisible character that does not affect glyphs of biform
characters.
Yes, the ZWJ before the hyphen on the first line would be harmless. But
the ZWJ after the break (at the beginning of the second line) will cause
the following character to take on a medial or final form, whereas it
should remain initial or medial when it's after alef/dal/re/waw.
JK
