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[feaLib] Ignore superfluous script statements

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Setting script that is the same as current language system should make
no effect. This is not documented in the spec, but it is what makeotf
does. This as the effect of preserving lookupflag when set before such a
script statement.

Fixes https://github.com/fonttools/fonttools/issues/1824
This commit is contained in:
Khaled Hosny 2020-04-20 23:45:45 +02:00
parent 6a24c8fed1
commit 259e586f5d
3 changed files with 62 additions and 3 deletions
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3
Lib/fontTools/feaLib/builder.py
View File

@ -780,6 +780,9 @@ class Builder(object):
raise FeatureLibError(
"Script statements are not allowed "
"within standalone lookup blocks", location)
if self.language_systems == {(script, 'dflt')}:
# Nothing to do.
return
self.cur_lookup_ = None
self.script_ = script
self.lookupflag_ = 0

13
Tests/feaLib/data/lookupflag.fea
View File

@ -134,3 +134,16 @@ feature test {
pos one 1;
} V;
} test;
feature test {
lookup W {
lookupflag IgnoreMarks;
script latn;
pos one 1;
} W;
lookup X {
lookupflag IgnoreMarks;
script latn;
pos two 2;
} X;
} test;

49
Tests/feaLib/data/lookupflag.ttx
View File

@ -43,7 +43,7 @@
<GPOS>
<Version value="0x00010000"/>
<ScriptList>
<!-- ScriptCount=1 -->
<!-- ScriptCount=2 -->
<ScriptRecord index="0">
<ScriptTag value="DFLT"/>
<Script>
@ -55,9 +55,20 @@
<!-- LangSysCount=0 -->
</Script>
</ScriptRecord>
<ScriptRecord index="1">
<ScriptTag value="latn"/>
<Script>
<DefaultLangSys>
<ReqFeatureIndex value="65535"/>
<!-- FeatureCount=1 -->
<FeatureIndex index="0" value="1"/>
</DefaultLangSys>
<!-- LangSysCount=0 -->
</Script>
</ScriptRecord>
</ScriptList>
<FeatureList>
<!-- FeatureCount=1 -->
<!-- FeatureCount=2 -->
<FeatureRecord index="0">
<FeatureTag value="test"/>
<Feature>
@ -86,9 +97,17 @@
<LookupListIndex index="21" value="21"/>
</Feature>
</FeatureRecord>
<FeatureRecord index="1">
<FeatureTag value="test"/>
<Feature>
<!-- LookupCount=2 -->
<LookupListIndex index="0" value="22"/>
<LookupListIndex index="1" value="23"/>
</Feature>
</FeatureRecord>
</FeatureList>
<LookupList>
<!-- LookupCount=22 -->
<!-- LookupCount=24 -->
<Lookup index="0">
<LookupType value="1"/>
<LookupFlag value="1"/><!-- rightToLeft -->
@ -357,6 +376,30 @@
<Value XAdvance="1"/>
</SinglePos>
</Lookup>
<Lookup index="22">
<LookupType value="1"/>
<LookupFlag value="0"/>
<!-- SubTableCount=1 -->
<SinglePos index="0" Format="1">
<Coverage>
<Glyph value="one"/>
</Coverage>
<ValueFormat value="4"/>
<Value XAdvance="1"/>
</SinglePos>
</Lookup>
<Lookup index="23">
<LookupType value="1"/>
<LookupFlag value="8"/><!-- ignoreMarks -->
<!-- SubTableCount=1 -->
<SinglePos index="0" Format="1">
<Coverage>
<Glyph value="two"/>
</Coverage>
<ValueFormat value="4"/>
<Value XAdvance="2"/>
</SinglePos>
</Lookup>
</LookupList>
</GPOS>