private int this [LetterLabel label]
{
get
{
ArrayList a = labels [(int)label];
int pos = a.BinarySearch(next);
if (pos >= 0)
{
return((int)a [pos]); // next found in the array.
}
else if (~pos < a.Count)
{
return((int)a [~pos]); // next not found in the array, return the next higher.
}
else if (a.Count == 0)
{
throw new Error(); // empty array.
}
else
{
return((int)a [0]); // wrap around.
}
}
set
{
ArrayList a = labels [(int)label];
Trace.Assert(!a.Contains(value));
a.Add(value);
a.Sort();
}
}
public void Goto(LetterLabel label)
{
GotoZeroBasedStep(this [label]);
}
public void Gosub(LetterLabel label)
{
SaveReturnAddress();
Goto(label);
}
