def setUnicodeRanges(font):
"""Set the OS/2 unicode range fields according to the cmap. It sets any bit
the cmap defines at least one character for.
"""
cmap = getBestCmap(font)
rangeBits = unicoderanges.getUnicodeRangeBits(cmap.keys())
os2Table = font["OS/2"]
if False:
oldRangeBits = unicoderanges.unpackRangeBits(os2Table.ulUnicodeRange1, os2Table.ulUnicodeRange2,
os2Table.ulUnicodeRange3, os2Table.ulUnicodeRange4)
print(sorted(oldRangeBits))
print(sorted(rangeBits))
print("now but not before:", sorted(rangeBits - oldRangeBits))
print("before but not now:", sorted(oldRangeBits - rangeBits))
(os2Table.ulUnicodeRange1, os2Table.ulUnicodeRange2,
os2Table.ulUnicodeRange3, os2Table.ulUnicodeRange4) = unicoderanges.packRangeBits(rangeBits)
def pruneOTScripts(self):
# Look at the remaining scripts and delete those we have zero characters left for.
allScriptTags = set()
for tableTag in ["GPOS", "GSUB"]:
if tableTag not in self.font:
continue
table = self.font[tableTag].table
for script in table.ScriptList.ScriptRecord:
allScriptTags.add(script.ScriptTag)
if not allScriptTags:
return
cmap = getBestCmap(self.font)
unicodes = set(cmap)
rangeBits = unicoderanges.getUnicodeRangeBits(unicodes)
scriptsToDelete = set()
for scriptTag in allScriptTags:
try:
ranges = unicoderanges.getUnicodeRangesByScriptTag(scriptTag)
except KeyError:
import sys
sys.stderr.write(
"pruneOTScripts: can't find unicode range for %r script\n"
% scriptTag)
else:
for bit, name, rangeMinimum, rangeMaximum in ranges:
if bit in rangeBits:
# yes, there's at least one character in the range
break
else:
# no characters found in the range for the script
scriptsToDelete.add(scriptTag)
if not scriptsToDelete:
return
for tableTag in ["GPOS", "GSUB"]:
if tableTag not in self.font:
continue
table = self.font[tableTag].table
table.ScriptList.ScriptRecord = [
script for script in table.ScriptList.ScriptRecord
if script.ScriptTag not in scriptsToDelete
]