private Argument ExecuteOperator(Operator op, Stack<Argument> stack)
{
if (stack.Count < 2)
{
throw new InvalidOperationException("Too few arguments for operator");
}
var arg2 = stack.Pop();
var arg1 = stack.Pop();
return op.CalculateResult(arg1, arg2);
}
void RelOp(out Operator op)
{
op = Operator.Bad;
switch (la.kind) {
case 11: {
Get();
op = Operator.Eq;
break;
}
case 12: {
Get();
op = Operator.Ne;
break;
}
case 13: {
Get();
op = Operator.Lt;
break;
}
case 14: {
Get();
op = Operator.Le;
break;
}
case 15: {
Get();
op = Operator.Gt;
break;
}
case 16: {
Get();
op = Operator.Ge;
break;
}
default: SynErr(23); break;
}
}
void OrOp(out Operator op)
{
op = Operator.Bad;
Expect(10);
op = Operator.Or;
}
void MulOp(out Operator op)
{
op = Operator.Bad;
if (la.kind == 19) {
Get();
op = Operator.Mul;
} else if (la.kind == 20) {
Get();
op = Operator.Div;
} else SynErr(26);
}
void AndOp(out Operator op)
{
op = Operator.Bad;
Expect(9);
op = Operator.And;
}
void AddOp(out Operator op)
{
op = Operator.Bad;
if (la.kind == 17) {
Get();
op = Operator.Add;
} else if (la.kind == 18) {
Get();
op = Operator.Sub;
} else SynErr(24);
}
public UnaryOperation(Operator op, Expression expression)
{
_op = op;
_expression = expression;
}
public BinaryOperation(Operator op, Expression e1, Expression e2)
{
_op = op;
_e1 = e1;
_e2 = e2;
}