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[feaLib] Synthesize alternate substitutions for feature aalt

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After this change, feaLib synthesizes the same lookups as makeotf v2.0.90
for `feature aalt` in the example of section 8.a of the OpenType Feature
File specification.
This commit is contained in:
Sascha Brawer 2016-02-03 15:17:37 +01:00
parent bf79ceb2f2
commit edb1ed0fcc
2 changed files with 23 additions and 9 deletions
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4
Lib/fontTools/feaLib/builder.py
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@ -141,9 +141,9 @@ class Builder(object):
self.add_single_subst(
self.aalt_location_, prefix=None, suffix=None, mapping=single)
for glyph, repl in multi.items():
self.add_multiple_subst(
self.add_alternate_subst(
self.aalt_location_, prefix=None, glyph=glyph, suffix=None,
replacements=repl)
replacement=repl)
self.end_feature()
self.lookups_.extend(old_lookups)

28
Lib/fontTools/feaLib/testdata/spec8a.ttx vendored
View File

@ -94,15 +94,29 @@
</SingleSubst>
</Lookup>
<Lookup index="1">
<!-- LookupType=2 -->
<!-- LookupType=3 -->
<LookupFlag value="0"/>
<!-- SubTableCount=1 -->
<MultipleSubst index="0">
<Substitution in="a" out="A.sc,a.alt1,a.alt2,a.alt3"/>
<Substitution in="b" out="B.sc,b.alt"/>
<Substitution in="c" out="C.sc,c.mid"/>
<Substitution in="d" out="d.alt,d.mid"/>
</MultipleSubst>
<AlternateSubst index="0">
<AlternateSet glyph="a">
<Alternate glyph="A.sc"/>
<Alternate glyph="a.alt1"/>
<Alternate glyph="a.alt2"/>
<Alternate glyph="a.alt3"/>
</AlternateSet>
<AlternateSet glyph="b">
<Alternate glyph="B.sc"/>
<Alternate glyph="b.alt"/>
</AlternateSet>
<AlternateSet glyph="c">
<Alternate glyph="C.sc"/>
<Alternate glyph="c.mid"/>
</AlternateSet>
<AlternateSet glyph="d">
<Alternate glyph="d.alt"/>
<Alternate glyph="d.mid"/>
</AlternateSet>
</AlternateSubst>
</Lookup>
<Lookup index="2">
<!-- LookupType=1 -->