def _registerDistLookups(self, feature, lookups):
scripts = self.context.scriptGroups["dist"]
ltrLookups = lookups.get("LTR")
if ltrLookups:
for script, langs in scripts.get("LTR", []):
ast.addLookupReferences(feature, ltrLookups, script, langs)
rtlLookups = lookups.get("RTL")
if rtlLookups:
for script, langs in scripts.get("RTL", []):
ast.addLookupReferences(feature, rtlLookups, script, langs)
def _registerKernLookups(self, feature, lookups):
if "DFLT" in lookups:
ast.addLookupReferences(feature, lookups["DFLT"])
scriptGroups = self.context.scriptGroups
if "dist" in self.context.todo:
distScripts = scriptGroups["dist"]
else:
distScripts = {}
kernScripts = scriptGroups.get("kern", {})
ltrScripts = kernScripts.get("LTR", [])
rtlScripts = kernScripts.get("RTL", [])
ltrLookups = lookups.get("LTR")
rtlLookups = lookups.get("RTL")
if ltrLookups and rtlLookups:
if ltrScripts and rtlScripts:
for script, langs in ltrScripts:
ast.addLookupReferences(feature, ltrLookups, script, langs)
for script, langs in rtlScripts:
ast.addLookupReferences(feature, rtlLookups, script, langs)
elif ltrScripts:
ast.addLookupReferences(feature, rtlLookups, script="DFLT")
for script, langs in ltrScripts:
ast.addLookupReferences(feature, ltrLookups, script, langs)
elif rtlScripts:
ast.addLookupReferences(feature, ltrLookups, script="DFLT")
for script, langs in rtlScripts:
ast.addLookupReferences(feature, rtlLookups, script, langs)
else:
if not (distScripts.get("LTR") and distScripts.get("RTL")):
raise ValueError(
"cannot use DFLT script for both LTR and RTL kern "
"lookups; add 'languagesystems' to features for at "
"least one LTR or RTL script using the kern feature")
elif ltrLookups:
if not (rtlScripts or distScripts):
ast.addLookupReferences(feature, ltrLookups)
else:
ast.addLookupReferences(feature, ltrLookups, script="DFLT")
for script, langs in ltrScripts:
ast.addLookupReferences(feature, ltrLookups, script, langs)
elif rtlLookups:
if not (ltrScripts or distScripts):
ast.addLookupReferences(feature, rtlLookups)
else:
ast.addLookupReferences(feature, rtlLookups, script="DFLT")
for script, langs in rtlScripts:
ast.addLookupReferences(feature, rtlLookups, script, langs)