/// <summary>
/// Take the topmost arguments down to the ARG_MARKER_STRING, pop them off, and then
/// put them back again in reversed order so a function can read them in normal order.
/// Note that if this is an indirect call, it will also consume the thing just under
/// the ARG_MARKER, since that's expected to be the delegate or KOSDelegate that we already
/// read and pulled the needed information from.
/// <param name="cpu">the cpu we are running on, fur stack manipulation purposes</param>
/// <param name="direct">need to know if this was a direct or indirect call. If indirect,
/// then that means it also needs to consume the indirect reference off the stack just under
/// the args</param>
/// </summary>
public static void ReverseStackArgs(ICpu cpu, bool direct)
{
List <object> args = new List <object>();
object arg = cpu.PopValueArgument();
while (cpu.GetArgumentStackSize() > 0 && arg.GetType() != ArgMarkerType)
{
args.Add(arg);
// It's important to dereference with PopValue, not using PopArgumentStack, because the function
// being called might not even be able to see the variable in scope anyway.
// In other words, if calling a function like so:
// declare foo to 3.
// myfunc(foo).
// The code inside myfunc needs to see that as being identical to just saying:
// myfunc(3).
// It has to be unaware of the fact that the name of the argument was 'foo'. It just needs to
// see the contents that were inside foo.
arg = cpu.PopValueArgument();
}
if (!direct)
{
cpu.PopArgumentStack(); // throw away the delegate or KOSDelegate info - we already snarfed it by now.
}
// Push the arg marker back on again.
cpu.PushArgumentStack(new KOSArgMarkerType());
// Push the arguments back on again, which will invert their order:
foreach (object item in args)
{
cpu.PushArgumentStack(item);
}
}
public void CanGetListIndex()
{
var list = new ListValue();
list.Add(new StringValue("bar"));
cpu.PushArgumentStack(list);
const int INDEX = 0;
cpu.PushArgumentStack(INDEX);
var opcode = new OpcodeGetIndex();
opcode.Execute(cpu);
Assert.AreEqual(1, list.Count());
Assert.AreEqual(new StringValue("bar"), cpu.PopArgumentStack());
}
