recreate_collisions.py 文件源码

def create_cars_from_collision_json(collision_json):
    """
    Creates all the cars stored in a json-string reporting a collision. The json must have the form
    {"time":<string with specified format>, "message":{"collision_code":<string>,
    "collision_initial_conditions":<list of cars>}}. All followers have been assigned.
    Time format: "%Y-%m-%d %H:%M:%S,%f".
    :param collision_json: <string> json with a collision report.
    :return: dictionary with the cars. The key value is the name of the car.
    """
    collision_information = JSONDecoder().decode(collision_json)
    json_cars = collision_information["message"]["collision_initial_conditions"]
    cars_dict = {}
    for json_car in json_cars:
        cars_dict[json_car["car_name"]] = create_car_from_json(json_car)
    for json_car in json_cars:
        if json_car["following"] in cars_dict:
            car = cars_dict[json_car["car_name"]]
            cars_dict[json_car["following"]].add_follower(car)
            car.set_following(True)
            car.set_controller(follower_controller)
    return cars_dict