def Parse(self, expression):
"""Parses an event filter expression.
Args:
expression (str): event filter expression.
Returns:
Expression: expression.
"""
if not expression:
return expressions.IdentityExpression()
self._Reset()
self._buffer = expression
token = self._GetNextToken()
while token:
token = self._GetNextToken()
return self._Reduce()
def testCompile(self): """Tests the Compile function.""" expression = expressions.IdentityExpression() expression.Compile()