public static object PerformUnaryOp(UnaryOperator op, object left, object right)
{
object operand = op.Side == UnaryOperator.OperandSide.Left ? left : right;
IEvaluator tempv = operand as IEvaluator;
if (tempv != null)
{
operand = tempv.Evaluate();
}
try {
return(op.ExecuteOperator(operand));
}
catch (InvalidCastException) when(operand is IOperator)
{
throw new ArgumentException("Unary operand cannot be " + operand.GetType().Name);
}
catch (Exception ex) when(ex is InvalidCastException || ex is FormatException || ex is ArgumentException || ex is OverflowException)
{
throw new ArgumentException("Unary operator '" + op.OperatorString + "' not defined.");
}
}
