def ParseIsBlock(self):
"""Returns a CharClass corresponding to one of the Unicode blocks."""
block = []
while self.IsBlockClass.test(self.the_char):
block.append(self.the_char)
self.next_char()
block = string.join(block, '')
if block.startswith("Is"):
try:
return CharClass.ucd_block(block[2:])
except KeyError:
raise RegularExpressionError(
"Invalid IsBlock name: %s" % block[2:])
else:
raise RegularExpressionError("Expected IsBlock [%i]" % self.pos)
