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# Code for converting a Chaining object into feaLib statements
import fontTools.feaLib.ast as feaast
# Can we chain multiple lookups?
def glyphref(g):
if len(g) == 1:
return feaast.GlyphName(g[0])
return feaast.GlyphClass([feaast.GlyphName(x) for x in g])
def gensym(ff):
if "index" not in ff.scratch:
ff.scratch["index"] = 0
ff.scratch["index"] = ff.scratch["index"] + 1
return str(ff.scratch["index"])
def replaceLongWithClasses(i, ff):
for ix, gc in enumerate(i):
if len(gc) > 5:
classname = ff.getNamedClassFor(sorted(gc), "class" + gensym(ff))
i[ix] = ["@" + classname]
def feaPreamble(self, ff):
if "glyphclasses" not in ff.scratch:
ff.scratch["glyphclasses"] = {
tuple(sorted(ff.namedClasses[g])): g for g in ff.namedClasses.keys()
}
replaceLongWithClasses(self.input, ff)
replaceLongWithClasses(self.precontext, ff)
replaceLongWithClasses(self.postcontext, ff)
from fontFeatures import RoutineReference
# Ensure all linked routines have names
for lul in self.lookups:
for r in lul or []:
assert isinstance(r, RoutineReference)
assert r.routine
if not r.routine.name:
r.routine.name = "ChainedRoutine" + gensym(ff)
if not r.name:
r.name = r.routine.name
return []
def _complex(self):
if self.stage == "sub":
routine = feaast.ChainContextSubstStatement
else:
routine = feaast.ChainContextPosStatement
return routine(
[glyphref(x) for x in self.precontext],
[glyphref(x) for x in self.input],
[glyphref(x) for x in self.postcontext],
self.lookups,
)
def asFeaAST(self):
if len(self.lookups) > 0 and any([x is not None for x in self.lookups]):
# Fill in the blanks
if self.stage == "sub":
routine = feaast.ChainContextSubstStatement
else:
routine = feaast.ChainContextPosStatement
# Check for >1 lookups per position
if any([x and len(x) > 1 for x in self.lookups]):
return _complex(self)
lookups = self.lookups
return routine(
[glyphref(x) for x in self.precontext],
[glyphref(x) for x in self.input],
[glyphref(x) for x in self.postcontext],
lookups,
)
else:
return feaast.IgnoreSubstStatement(
chainContexts=[
[
[glyphref(x) for x in self.precontext],
[glyphref(x) for x in self.input],
[glyphref(x) for x in self.postcontext],
]
]
)
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