public override object VisitUnary(UnaryAstNode node) {
var operandValue = Evaluate(node.Operand);
if (operandValue.IsError)
return operandValue;
switch (node.Operator.Kind) {
case TokenKind.Not:
case TokenKind.NotSign:
var operandBoolValue = ConvertToBool(operandValue);
if (operandBoolValue.IsError)
return operandBoolValue;
return Result(!operandBoolValue.BoolValue);
default:
throw new InvalidOperationException(string.Format("Internal error: unary operator '{0}' is not supported.", node.Token.Kind));
}
}
public virtual object VisitUnary(UnaryAstNode node) {
return null;
}
public virtual object VisitUnary(UnaryAstNode node)
{
return(null);
}