def _error_expected(self, expected_tokens):
expected_tokens = list(expected_tokens)
if len(expected_tokens) == 1:
expected_desc = expected_tokens[0]
else:
expected_desc = "one of {}".format(", ".join(expected_tokens))
raise ParseError.from_token(
"Expected {}".format(expected_desc),
self._token
)
def go(self, token):
if self.can_go(token):
self.node = self.node.out_edges[token.value]
else:
raise ParseError.from_token("Unexpected token", token)
