def _Error(self, error_message):
"""Generic query error.
Args:
error_message (str): message for the 'Parse Error' string.
Raises:
BadQueryError and passes on an error message from the caller. Will
raise BadQueryError on all calls to _Error()
"""
if self._next_symbol >= len(self._symbols):
raise exceptions.BadQueryError("Parse Error: %s at end of string" %
error_message)
else:
raise exceptions.BadQueryError(
"Parse Error: %s at symbol %s" %
(error_message, self._symbols[self._next_symbol]))
def _to_filter(self, post=False):
"""(Attempt to) convert to a low-level filter instance.
Args:
post (bool): Indicates if this is a post-filter node.
Raises:
.BadQueryError: If ``post`` is :data:`False`, because there's no
point submitting a query that will never return anything.
"""
if post:
return None
raise exceptions.BadQueryError("Cannot convert FalseNode to predicate")
def _raise_cast_error(message):
raise exceptions.BadQueryError("GQL function error: {}".format(message))