Some of the rail redstone logic

function updateSignal() {
    if(_root.states[_parent._name][1][1] != -1) {
        if(_root.states[_parent._name][0] == 1) {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy)][1][0] == undefined || _root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy)][1][0] != _root.states[_parent._name][1][0]+1) && (_root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy-1)][1][0] == undefined || _root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy-1)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(1, 0, 1);
            changeRedstone(1, -1, 1);
        } else if(_root.states[_parent._name][0] == 2) {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy+1)][1][0] == undefined || _root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy+1)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(1, 0, 1);
            changeRedstone(1, -1, 1);
        } else {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy-1)][1][0] == undefined || _root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy-1)][1][0] != _root.states[_parent._name][1][0]+1) && (_root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy)][1][0] == undefined || _root.states["blockX"+(_parent.ex-1)+"Y"+(_parent.wy)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(1, 1, 1);
        }
    }
    if(_root.states[_parent._name][1][1] != 1) {
        if(_root.states[_parent._name][0] == 1) {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy)][1][0] == undefined || _root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy)][1][0] != _root.states[_parent._name][1][0]+1) && (_root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy-1)][1][0] == undefined || _root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy-1)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(-1, 0, -1);
            changeRedstone(-1, -1, -1);
        } else if(_root.states[_parent._name][0] == 2) {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy-1)][1][0] == undefined || _root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy-1)][1][0] != _root.states[_parent._name][1][0]+1) && (_root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy)][1][0] == undefined || _root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(-1, 1, -1);
        } else {
            if(_root.states[_parent._name][1][0] != 16 && (_root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy+1)][1][0] == undefined || _root.states["blockX"+(_parent.ex+1)+"Y"+(_parent.wy+1)][1][0] != _root.states[_parent._name][1][0]+1)) _root.states[_parent._name][1] = [0, 0];
            changeRedstone(-1, 0, -1);
            changeRedstone(-1, -1, -1);
        }
    }
}