def scan(self, source):
self.current_symbol, self.current_position = source.getNextSymbol()
self.start_position = deepcopy( self.current_position )
while True:
if Symbol.isComment(self.current_symbol):
self.scanComment(source)
elif Symbol.isSeparator(self.current_symbol):
self.scanSeperator(source)
elif Symbol.isEof(self.current_symbol):
return None
else:
return self.scanToken(source)
def testForEof(self):
if Symbol.isEof(self.current_symbol):
pos_str = self.positionToString(self.current_position)
raise ScanException('Error scanning at %s.' % (pos_str) )
