frac opentype feature broken by \setbreakpoints[compound]

frac opentype feature broken by \setbreakpoints[compound]

[MF]

Hello list,
I found an interference between the "frac" opentype feature and
\setbreakpoints[compound], which make the former fail when you have a
numerator more than 2 digit wide.

I found it with Adobe Garamond Premier Pro: with
\setbreakpoints[compound], when the fraction had a 3-digit (or more)
numerator, the denominator stayed high as the numerator (like a
superscript).

Here I replaced Garamond Premier Pro with the freely available "Lato"
font, to let you reproduce the problem.
The outcome is different, but still erroneous:
\setbreakpoints[compound] makes ConTeXt ignore the "frac" feature at
all.

Please try this:

\definefontfeature[frac][frac=yes]
\definefontfamily[default][rm][lato][features=frac]
\setupbodyfont[default,rm,11pt]

\setbreakpoints[compound]

\starttext

\addff{frac} 1/3, 1/100, 1/1000, {\setbreakpoints[reset]1633/100},
2345/12.

\stoptext

A workaround is a local \setbreakpoints[reset] limited to the fraction.

Best regards,
Massi
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Re: frac opentype feature broken by \setbreakpoints[compound]

[Hans Hagen]

On 2/13/2017 4:47 PM, MF wrote:
> Hello list,
> I found an interference between the "frac" opentype feature and
> \setbreakpoints[compound], which make the former fail when you have a
> numerator more than 2 digit wide.
>
> I found it with Adobe Garamond Premier Pro: with
> \setbreakpoints[compound], when the fraction had a 3-digit (or more)
> numerator, the denominator stayed high as the numerator (like a
> superscript).
>
> Here I replaced Garamond Premier Pro with the freely available "Lato"
> font, to let you reproduce the problem.
> The outcome is different, but still erroneous:
> \setbreakpoints[compound] makes ConTeXt ignore the "frac" feature at
> all.
>
> Please try this:
>
> \definefontfeature[frac][frac=yes]
> \definefontfamily[default][rm][lato][features=frac]
> \setupbodyfont[default,rm,11pt]
>
> \setbreakpoints[compound]
>
> \starttext
>
> \addff{frac} 1/3, 1/100, 1/1000, {\setbreakpoints[reset]1633/100},
> 2345/12.
>
> \stoptext
>
> A workaround is a local \setbreakpoints[reset] limited to the fraction.

i'll add this:

\definefontfeature[f:fractions][frac=yes]

\definealternativestyle [fractions]  [\setfractions\resetbreakpoints] 
[\setfractions\resetbreakpoints]

\unexpanded\def\setfractions{\doaddfeature{f:fractions}}


\addff{frac} 1/3, 1/100, 1/1000, {\resetbreakpoints 1633/100}, 2345/12.

\fractions{1/3, 1/100, 1/1000, 1633/100, 2345/12}.


Keep in mind that often the fractions feature sis incomplete and can 
even give weird side effects when applied to a whole stretch of text so 
limiting the scope is wise anyway

Hans

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