def _evaluate(self, expression):
parser = Parser(self._factory.as_tokens(expression, "Unknown"),
self._factory, self._environment)
return "".join(map(str, parser.evaluate()))
def _classify(self, expression):
parser = Parser(self._factory.as_tokens(expression, "Unknown"),
self._factory, self._environment)
parser.evaluate()
return parser.shall_expand()
