34 lines
1.6 KiB
Plaintext
34 lines
1.6 KiB
Plaintext
# OpenType Feature File specification, section 5.d, example 1.
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# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html
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feature F1 {
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sub [one one.oldstyle] [slash fraction] [two two.oldstyle] by onehalf;
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} F1;
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# Since the OpenType specification does not allow ligature substitutions
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# to be specified on target sequences that contain glyph classes, the
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# implementation software will enumerate all specific glyph sequences
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# if glyph classes are detected in <glyph sequence>. Thus, the above
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# example produces an identical representation in the font as if all
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# the sequences were manually enumerated by the font editor:
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#
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# NOTE(anthrotype): The previous sentence is no longer entirely true, since we
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# now preserve the order in which the ligatures (with same length and first glyph)
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# were specified in the feature file and do not sort them alphabetically
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# by the ligature component names. Therefore, the way this particular example from
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# the FEA spec is written will produce two slightly different representations
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# in the font in which the ligatures are enumerated differently, however the two
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# lookups are functionally equivalent.
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# See: https://github.com/fonttools/fonttools/issues/3428
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# https://github.com/adobe-type-tools/afdko/issues/1727
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feature F2 {
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sub one slash two by onehalf;
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sub one.oldstyle slash two by onehalf;
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sub one fraction two by onehalf;
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sub one.oldstyle fraction two by onehalf;
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sub one slash two.oldstyle by onehalf;
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sub one.oldstyle slash two.oldstyle by onehalf;
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sub one fraction two.oldstyle by onehalf;
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sub one.oldstyle fraction two.oldstyle by onehalf;
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} F2;
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