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from ql.ast.nodes.expressions.unary_operators.unary_operator import UnaryOperatorNode
from ql.types.boolean import QLBoolean
from ql.types.undefined import QLUndefined
class NegationOperatorNode(UnaryOperatorNode):
def __init__(self, metadata, expression_type, expression, value):
super(NegationOperatorNode, self).__init__(metadata, expression_type, expression, value)
self.__valid_types = {
QLBoolean: QLBoolean,
}
def get_result_type(self):
if self.__valid_types.get(self.expression.expression_type):
return self.__valid_types.get(self.expression.expression_type)
return QLUndefined
def evaluate(self):
self.value = QLBoolean(not self.expression.value)
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