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venv/Lib/site-packages/fontTools/ufoLib/kerning.py

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+
+
+def lookupKerningValue(pair, kerning, groups, fallback=0, glyphToFirstGroup=None, glyphToSecondGroup=None):
+	"""
+	Note: This expects kerning to be a flat dictionary
+	of kerning pairs, not the nested structure used
+	in kerning.plist.
+
+	>>> groups = {
+	...     "public.kern1.O" : ["O", "D", "Q"],
+	...     "public.kern2.E" : ["E", "F"]
+	... }
+	>>> kerning = {
+	...     ("public.kern1.O", "public.kern2.E") : -100,
+	...     ("public.kern1.O", "F") : -200,
+	...     ("D", "F") : -300
+	... }
+	>>> lookupKerningValue(("D", "F"), kerning, groups)
+	-300
+	>>> lookupKerningValue(("O", "F"), kerning, groups)
+	-200
+	>>> lookupKerningValue(("O", "E"), kerning, groups)
+	-100
+	>>> lookupKerningValue(("O", "O"), kerning, groups)
+	0
+	>>> lookupKerningValue(("E", "E"), kerning, groups)
+	0
+	>>> lookupKerningValue(("E", "O"), kerning, groups)
+	0
+	>>> lookupKerningValue(("X", "X"), kerning, groups)
+	0
+	>>> lookupKerningValue(("public.kern1.O", "public.kern2.E"),
+	...     kerning, groups)
+	-100
+	>>> lookupKerningValue(("public.kern1.O", "F"), kerning, groups)
+	-200
+	>>> lookupKerningValue(("O", "public.kern2.E"), kerning, groups)
+	-100
+	>>> lookupKerningValue(("public.kern1.X", "public.kern2.X"), kerning, groups)
+	0
+	"""
+	# quickly check to see if the pair is in the kerning dictionary
+	if pair in kerning:
+		return kerning[pair]
+	# create glyph to group mapping
+	if glyphToFirstGroup is not None:
+		assert glyphToSecondGroup is not None
+	if glyphToSecondGroup is not None:
+		assert glyphToFirstGroup is not None
+	if glyphToFirstGroup is None:
+		glyphToFirstGroup = {}
+		glyphToSecondGroup = {}
+		for group, groupMembers in groups.items():
+			if group.startswith("public.kern1."):
+				for glyph in groupMembers:
+					glyphToFirstGroup[glyph] = group
+			elif group.startswith("public.kern2."):
+				for glyph in groupMembers:
+					glyphToSecondGroup[glyph] = group
+	# get group names and make sure first and second are glyph names
+	first, second = pair
+	firstGroup = secondGroup = None
+	if first.startswith("public.kern1."):
+		firstGroup = first
+		first = None
+	else:
+		firstGroup = glyphToFirstGroup.get(first)
+	if second.startswith("public.kern2."):
+		secondGroup = second
+		second = None
+	else:
+		secondGroup = glyphToSecondGroup.get(second)
+	# make an ordered list of pairs to look up
+	pairs = [
+		(first, second),
+		(first, secondGroup),
+		(firstGroup, second),
+		(firstGroup, secondGroup)
+	]
+	# look up the pairs and return any matches
+	for pair in pairs:
+		if pair in kerning:
+			return kerning[pair]
+	# use the fallback value
+	return fallback
+
+if __name__ == "__main__":
+	import doctest
+	doctest.testmod()