Hello
I want to substitute a Lam Alef with another one in a specific mark occurrence using Contextual Alternates (calt) like this:
lookup ChainingContext3 {
lookupflags RightToLeft;
context ("alef-arab" "sukun-arab.isol") "lamalefmaddaabove-arab.isol";
sub 0 SingleSubstitution9;
}
I added the substitution table as follows:
But nothing changed in FC?
Any help please.
Thanks
Maybe alef-arab and sukun-arab.isol have been replaced by a ligature before calt is triggered.
Does the Proofing dialog reveal anything?
Hello @ErwinDenissen and thanks for replying. In Arabic, the Lam Alef is a ligature of Lam.init and Alef.fina, is that the reason? i.e. no possibility to substitute a ligature?.
No, the Alef and Sukun are both independent, there’s no occurrence of ligature between them.
Do show us a screenshot of the Proofing dialog, so we better understand the problem.
Or even better, isolate the issue in a reduced font project and send that to us.
@ErwinDenissen Please take a look at the Proofing log:
@munir4ye I checked “Ignore Marks” but nothing changed:
@munir4ye This is also my Substitution Table:
The calt feature comes after isol, fina, and init have been processed, so in your case alef-arab has already been substituted by alef-arab.isol, hence your chaining context rule is never matched.
@ErwinDenissen So there is no possibility to substitute ligature glyph?
Since alef-arab is replaced by alef-arab.isol, I think it should work if you put that in your rule.
