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Log warning instead of raising an error when identical substitutions are added again

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This commit is contained in:
Jens Kutilek 2019-12-02 17:05:59 +01:00
parent 9d3b14dd5f
commit 9c6b7d2e7a
1 changed files with 13 additions and 4 deletions
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17
Lib/fontTools/feaLib/builder.py
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@ -914,10 +914,19 @@ class Builder(object):
lookup = self.get_lookup_(location, SingleSubstBuilder)
for (from_glyph, to_glyph) in mapping.items():
if from_glyph in lookup.mapping:
raise FeatureLibError(
'Already defined rule for replacing glyph "%s" by "%s"' %
(from_glyph, lookup.mapping[from_glyph]),
location)
if to_glyph == lookup.mapping[from_glyph]:
# log warning?
# FDK logs "[NOTE] Removing duplicate single substitution in 'xxxx' feature: from_glyph, to_glyph" in this case
log.info(FeatureLibError(
'Removing duplicate single substitution for glyph "%s" by "%s"' %
(from_glyph, to_glyph),
location
))
else:
raise FeatureLibError(
'Already defined rule for replacing glyph "%s" by "%s"' %
(from_glyph, lookup.mapping[from_glyph]),
location)
lookup.mapping[from_glyph] = to_glyph
def add_single_subst_chained_(self, location, prefix, suffix, mapping):