RosbagMetadataHandler.py 文件源码

def ordered_load(stream, Loader=yaml.Loader, object_pairs_hook=OrderedDict):
    """ Wrapper function to assert ordered loading of yaml file """

    class OrderedLoader(Loader):
        pass

    def construct_mapping(loader, node):
        loader.flatten_mapping(node)
        return object_pairs_hook(loader.construct_pairs(node))

    OrderedLoader.add_constructor(
        yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG,
        construct_mapping)
    return yaml.load(stream, OrderedLoader)


# Represent OrderedDict as normal yaml when dumping to file or rosbag