In XITS I have stylistic sets (ss01-07) for accessing additional
alphabets not bresent in Unicode, or variants of exising ones.
For example, ss01 maps the script alphabets to an alternate calligraphic
one, so I did:
\starttext
\setupbodyfont[xits]
\ctxlua{fonts.otf.features.register_base_substitution('ss01')}
\definefontfeature[ss01][mode=base,script=math,ss01=yes]
$\addff{ss01}\cal ABCDEFG$
\stoptext
(I was not expecting \addff to work in math, but anyway).
This works, however, but I don't want to set the feature globally:
\starttext
\ctxlua{fonts.otf.features.register_base_substitution('ss01')}
\definefontfeature[math-text][mode=base,script=math,ss01=yes]
\setupbodyfont[xits]
$\cal ABCDEF$
\stoptext
Regards,
Khaled
--
Khaled Hosny
Arabic localiser and member of Arabeyes.org team
Free font developer
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