def build(self):
subtables = []
for prefix, suffix, mapping in self.substitutions:
st = otTables.ReverseChainSingleSubst()
st.Format = 1
self.setBacktrackCoverage_(prefix, st)
self.setLookAheadCoverage_(suffix, st)
st.Coverage = self.buildCoverage_(mapping.keys())
st.GlyphCount = len(mapping)
st.Substitute = [mapping[g] for g in st.Coverage.glyphs]
subtables.append(st)
return self.buildLookup_(subtables)
def parseReverseChainedSubst(lines, font, _lookupMap=None):
self = ot.ReverseChainSingleSubst()
self.Format = 1
coverages = ([], [])
while lines.peeks()[0].endswith("coverage definition begin"):
typ = lines.peek()[0][:-len("coverage definition begin")].lower()
idx,klass = {
'backtrack': (0,ot.BacktrackCoverage),
'lookahead': (1,ot.LookAheadCoverage),
}[typ]
coverages[idx].append(parseCoverage(lines, font, klass=klass))
self.BacktrackCoverage = coverages[0]
self.BacktrackGlyphCount = len(self.BacktrackCoverage)
self.LookAheadCoverage = coverages[1]
self.LookAheadGlyphCount = len(self.LookAheadCoverage)
mapping = {}
for line in lines:
assert len(line) == 2, line
line = makeGlyphs(line)
mapping[line[0]] = line[1]
self.Coverage = makeCoverage(set(mapping.keys()), font)
self.Substitute = [mapping[k] for k in self.Coverage.glyphs]
self.GlyphCount = len(self.Substitute)
return self