private Node Optimise(Node node)
{
int c;
var next = node?.Next;
switch (node)
{
case DataNode n:
c = n.Change;
while (next is DataNode dn)
{
c += dn.Change;
next = next.Next;
}
node = n.WithChange(c);
break;
case PtrNode n:
c = n.Change;
while (next is PtrNode pn)
{
c += pn.Change;
next = next.Next;
}
node = n.WithChange(c);
break;
case LoopNode n:
node = n.WithInner(Optimise(n.Inner));
break;
}
node = node?.WithNext(Optimise(next));
return(node);
}
