def do(self, grid: Grid, robot: Robot):
if robot.is_lost:
raise Exception('Dead')
orientation = robot.orientation
current_pos = robot.position
# Ignore instruction if known bad place.
if MoveForward.__to_dropoff(grid, current_pos, orientation):
return
next_position = orientation.next_forward_position(current_pos)
if grid.is_within_grid(next_position):
robot.set_position(next_position)
else:
robot.is_now_lost()
label = Label(orientation)
grid.add_scent(current_pos, label)
def do(self, grid: Grid, robot: Robot):
robot.set_state(self.pos, self.orientation)
if not grid.is_within_grid(robot.position):
robot.is_now_lost()