private void funcFirst(Stack <RpnItemOperand> stack, int argCount)
{
RpnItemOperand result = null;
while (argCount-- > 0)
{
var test = stack.Pop();
if (!test.IsNull)
{
result = test;
}
}
stack.Push(result);
}
private void funcMax(Stack <RpnItemOperand> stack, int argCount)
{
RpnItemOperand result = null;
while (argCount-- > 0)
{
var test = stack.Pop();
if (!(test is RpnItemOperandNumeric))
{
continue;
}
if (result == null || test.Numeric > result.Numeric)
{
result = test;
}
}
stack.Push(result);
}
private void typeEval()
{
var stack = new Stack <RpnItemOperand>();
for (var i = 0; i < _original.Count; i++)
{
var item = _original[i];
var operand = item as RpnItemOperand;
if (operand != null)
{
stack.Push(operand);
continue;
}
var variable = item as RpnIndexedVariable;
if (variable != null)
{
stack.Push(variable.IsNumeric ? (RpnItemOperand) new RpnItemOperandNumeric(0) : new RpnItemOperandString(""));
continue;
}
var itemOperator = item as RpnItemOperator;
if (itemOperator != null)
{
switch (itemOperator.Operator)
{
case Operator.Addition:
{
var op2 = stack.Pop();
var op1 = stack.Pop();
if (op1 is RpnItemOperandString || op2 is RpnItemOperandString)
{
_original[i] = new RpnItemOperator(Operator.Concat);
push(stack, "");
}
else
{
push(stack, 0);
}
break;
}
case Operator.Negation:
case Operator.Not:
stack.Pop();
stack.Push(new RpnItemOperandNumeric(0));
break;
case Operator.NullCoalescing:
case Operator.Question:
{
var op2 = stack.Pop();
stack.Pop();
stack.Push(op2);
break;
}
default:
stack.Pop();
stack.Pop();
push(stack, 0);
break;
}
continue;
}
var itemFunction = item as RpnItemFunction;
if (itemFunction != null)
{
for (var j = 0; j < itemFunction.ArgumentCount; j++)
{
stack.Pop();
}
if (_functions[itemFunction.Name].Type == typeof(string))
{
push(stack, "");
}
else
{
push(stack, 0);
}
continue;
}
throw new Exception("What the hell happened here?");
}
ResultingType = stack.Single();
}