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from fontFeatures import Chaining, Routine
import logging
class MergeNonOverlappingRoutines:
level = 2
def apply(self, ff):
logger = logging.getLogger("fontFeatures")
deadRoutine = Routine(name="dead")
def haschains(routine):
for r in routine.rules:
if isinstance(r, Chaining):
return True
routinelist = ff.routines
ff.markRoutineUseInChains()
for lix, l in enumerate(routinelist):
if haschains(l) or l == deadRoutine:
continue
for rix in range(lix + 1, len(routinelist)):
r = routinelist[rix]
if haschains(r) or r == deadRoutine:
continue
if self.nonOverlapping(ff, l, r):
logger.info(
"Merging nonoverlapping routines %s , %s" % (l.name, r.name)
)
self.merge(l, r)
routinelist[rix] = deadRoutine
ff.routines = list(filter(lambda r: r != deadRoutine, routinelist))
def whatuses(self, routine, ff):
# Compute the glyphs which are a context for a routine to be called
return set.union(set([]), *[c.involved_glyphs for c in list(routine.usedin)])
def replaceAllReferences(self, usedin, first, second):
for i in usedin:
for routinelist in i.lookups:
if not routinelist:
continue
for ix, routine in enumerate(routinelist):
if routine == first:
routinelist[ix] = second
def merge(self, l, r):
l.rules.extend(r.rules)
if l.name and r.name:
l.name = l.name + "_" + r.name
elif r.name:
l.name = r.name
l.comments.extend(r.comments)
l.usedin = set.union(l.usedin, r.usedin)
self.replaceAllReferences(l.usedin, r, l)
def nonOverlapping(self, ff, l, r):
return (
not (l.involved_glyphs & r.involved_glyphs)
and not (self.whatuses(l, ff) & self.whatuses(r, ff))
and self.compatibleRules(l, r)
)
def compatibleRules(self, l, r):
from fontFeatures.feaLib.Routine import (
arrange_by_type,
arrange_by_lookup_type,
arrange_by_flags,
)
testRoutine = Routine()
testRoutine.rules.extend(l.rules)
testRoutine.rules.extend(r.rules)
if arrange_by_type(testRoutine):
return False
if arrange_by_lookup_type(testRoutine):
return False
if arrange_by_flags(testRoutine):
return False
return True
optimizations = [MergeNonOverlappingRoutines]
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