Re: Using stylistic sets in math

[Hans Hagen <pragma@wxs.nl>]

On 15-7-2010 9:24, Khaled Hosny wrote:
> 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

math currently operates in base mode; what i can do is map it onto some 
private range; as the number of math fonts is small it's no big deal to 
keep either a list of features that provide this; we'd best cook up such 
a list in small committee

also, context does math different than e.g. latex so having the glyphs 
in some well defined spot helps macro packages

actually, since there are probably more symbols not in unicode, i think 
that we need to define some extensions ourselves in the private use 
area.

so, to start with you need some 7 alphabets of 26 chars ? do you think 
that there will be more? for instance we can reserve 0xFE700-0xFE8FF

0xFE700  ss01
0xFE720  ss02
0xFE740  ss03
0xFE760  ss04
0xFE780  ss05
0xFE7A0  ss06
0xFE7C0  ss07

or we could even move to a much lower range (taco might know a good 
one); it does not matter much as we can define an offset

@aditya & mojca: didn't we have some pending symbols as well? I do use 
some slots for some lm left-overs but there might be more.

Hans

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