public override ConstraintViolation VisitUnaryOperatorNode(UnaryOperatorNode unNode)
{
if (unNode.Operator.Value == "~")
{
var operand = unNode.Operand as UnaryOperatorNode;
if (operand != null && operand.Operator.Value == "~")
{
return new ConstraintViolation(unNode, "The 'not' operator may not be applied directly to the result of another 'not' operator.");
}
}
return null;
}
public override ConstraintViolation VisitUnaryOperatorNode(UnaryOperatorNode unNode)
{
return null;
}
private Nodes.ParseTreeNode ParseNotExpression(IEnumerator<Token> tokenStream)
{
if (tokenStream.Current.TokenType == TokenType.UnaryOperator && tokenStream.Current.Value == "~")
{
var notNode = new Nodes.UnaryOperatorNode();
notNode.Operator = tokenStream.Current;
tokenStream.MoveNext();
notNode.Operand = this.ParseNotExpression(tokenStream);
return notNode;
}
else
{
return this.ParseParenExpression(tokenStream);
}
}
public abstract ConstraintViolation VisitUnaryOperatorNode(UnaryOperatorNode unNode);
