Track search using custom stack

    define int StateScan = 0;
    define int StateJnLeft = 1;
    define int StateJnRight = 2;
    define int StateExit = -1;

    final RFHumpRoute Scan()
    {
        RFHumpRoute node;
        LTrackSearch it = new LTrackSearch().DistanceLimit(4000.0f)
                                            .SleepAfter(10000)
                                            .DepthLimit(50)
                                            .Begin(Owner, LTrackSearch.Forward, 0));
        while (true) {
            switch (it.State()) {
                default: break;
                case StateScan: {
                    if (it.MoveNextTrackside()) {
                        RFHumpMarker marker = cast <RFHumpMarker> it.CurrentTrackside();
                        if (marker and marker.HumpTrack >= 0) {
                            if (marker.HumpTrack > 0) {
                                node = new RFHumpRoute();
                                node.TrackNumber = marker.HumpTrack;
                                node.Marker = marker;
                            }
                            it.PopState();
                        }
                        else if (it.OnJunction()) {
                            int dir = it.GetArrivedDirection();
                            if  (dir == LTrackSearch.Backward) {
                                node = new RFHumpRoute();
                                node.JnId = junc.GetId();
                                it.SetState(StateJnLeft, node);
                                it.PushState();
                                it.SetState(StateScan);
                                it.SetDirection(LTrackSearch.Left);
                            }
                        }
                    }
                    else
                        it.SetState(StateExit, null);
                    continue;
                }
                case StateJnLeft: {
                    RFHumpRoute parent = cast <RFHumpRoute> it.StateData();
                    parent.Left = node;
                    it.SetState(StateJnRight);
                    it.PushState();
                    it.SetState(StateScan);
                    it.SetDirection(LTrackSearch.Right);
                    continue;
                }
                case StateJnRight: {
                    RFHumpRoute parent = cast <RFHumpRoute> it.StateData();
                    parent.Right = node;
                    node = parent;
                    it.PopState();
                    continue;
                }
            }
        }
        return node;
    }