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"""ttLib.Substitution: Converting Substitution rules to TrueType."""
def lookup_type(self, forFea=False):
"""Mixin to determine the GSUB lookup type of a fontFeatures.Substitution object
Returns: integer GSUB lookup type."""
if self.reverse:
return 8
if not self.replacement:
return 2 # Deletion but treat as mult sub
if (
(self.has_context and not forFea)
or len(self.lookups) > 0
and any([x is not None for x in self.lookups])
):
return 6 # Chaining
# if self.input == self.replacement: # It's an ignore
# return 6
if len(self.input) == 1 and len(self.replacement) == 1:
if self.force_alt or (len(self.input[0]) == 1 and len(self.replacement[0]) > 1):
return 3 # Alternate
else:
return 1 # Single
if len(self.input) > 1 and len(self.replacement) == 1:
return 4 # Ligature
if len(self.input) > 1 and len(self.replacement) > 1:
return 9 # Not directly expressible!
if len(self.replacement) > 1:
return 2
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