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"""ttLib.Attachment: Converting Attachment rules to TrueType."""
from fontFeatures.utils import categorize_glyph
def lookup_type(self):
"""Mixin to determine the GPOS lookup type of a fontFeatures.Attachment object
Returns: integer GPOS lookup type."""
if self.is_cursive:
return 3
# Terrible hacks
firstbase = list(self.bases.keys())[0]
if (
hasattr(self, "fontfeatures")
and self.fontfeatures.glyphclasses.get(firstbase) == "mark"
):
return 6
if self.font and categorize_glyph(self.font, firstbase)[0] == "mark":
return 6
return 4
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