void _call(IList <IValue> Args, out IValue result)
{
var len = Args.Count;
if (len == 1)
{
if (Args[0] is IntegralValue)
{
int Index = (IntegralValue)Args[0];
if (Index < items.Count)
{
result = items[Index];
}
else
{
result = new None();
}
}
else
{
throw new Exception("Invalid list manipulation exception.");
}
}
else if (len == 2)
{
if (Args[0] is IntegralValue)
{
result = new None();
int Index = (IntegralValue)Args[0];
if (Index < 0)
{
if (Index != -1)
{
throw new Exception("Invalid list manipulation exception.");
}
items.Add(Args[1]);
}
else
{
if (items.Count > Index)
{
items[Index] = Args[1];
// Remove Nones from the end:
while (items.Count > 0 && items[items.Count - 1] is None)
{
items.RemoveAt(items.Count - 1);
}
}
else if (!(Args[1] is None))
{
while (items.Count < Index)
{
items.Add(new None());
}
items.Add(Args[1]);
}
}
}
else
{
throw new Exception("Invalid list manipulation exception.");
}
}
else
{
throw new Exception("Invalid list manipulation exception.");
}
}