def extractUFO(pathOrFile,
destination,
doGlyphs=True,
doInfo=True,
doKerning=True,
format=None,
customFunctions={}):
if format is None:
format = extractFormat(pathOrFile)
if format not in _extractFunctions:
raise ExtractorError("Unknown file format.")
func = _extractFunctions[format]
# wrap the extraction in a try: except: so that
# callers don't need to worry about lower level
# (fontTools, etc.) errors. if an error
# occurs, print the traceback for debugging and
# raise an ExtractorError.
try:
func(pathOrFile,
destination,
doGlyphs=doGlyphs,
doInfo=doInfo,
doKerning=doKerning,
customFunctions=customFunctions.get(format, []))
except:
import sys
import traceback
traceback.print_exc(file=sys.stdout)
raise ExtractorError("There was an error reading the %s file." %
format)
def _validateClasses(classes):
"""
Check to make sure that a glyph is not part of more than
one class. If this is found, an ExtractorError is raised.
"""
glyphToClass = {}
for className, glyphList in classes.items():
for glyphName in glyphList:
if glyphName not in glyphToClass:
glyphToClass[glyphName] = set()
glyphToClass[glyphName].add(className)
for glyphName, groupList in glyphToClass.items():
if len(groupList) > 1:
raise ExtractorError(
"Kerning classes are in an conflicting state.")
def _extractOpenTypeKerningFromKern(source):
kern = source["kern"]
kerning = {}
for subtable in kern.kernTables:
if subtable.version != 0:
raise ExtractorError("Unknown kern table formst: %d" %
subtable.version)
# XXX the spec defines coverage values for
# kerning direction (horizontal or vertical)
# minimum (some sort of kerning restriction)
# cross-stream (direction of the kerns within the direction of the table. odd.)
# override (if the values in this subtable should override the values of others)
# however, it is vague about how these should be stored.
# as such, we just assume that the direction is horizontal,
# that the values of all subtables are additive and that
# there are no minimum values.
kerning.update(subtable.kernTable)
return kerning
def _validateClasses(classes):
"""
Check to make sure that a glyph is not part of more than
one class. If this is found, an ExtractorError is raised.
"""
glyphToClass = {}
for className, glyphList in classes.items():
for glyphName in glyphList:
if glyphName not in glyphToClass:
glyphToClass[glyphName] = set()
glyphToClass[glyphName].add(className)
conflicts = 0
for glyphName, groupList in glyphToClass.items():
if len(groupList) > 1:
print('Conflicting kerning classes for %s:' % glyphName)
for groupId in groupList:
group = classes[groupId]
print(' %r => %s' % (groupId, ', '.join(group)))
conflicts += 1
if conflicts > 0:
raise ExtractorError("Kerning classes are in an conflicting state")