def sprite_map_name(map):
    """
    Returns the name of a sprite map The name is derived from the folder than
    contains the sprites.
    """
    map = map.render()
    sprite_maps = _get_cache('sprite_maps')
    sprite_map = sprite_maps.get(map)
    if not sprite_map:
        log.error("No sprite map found: %s", map, extra={'stack': True})
    if sprite_map:
        return String.unquoted(sprite_map['*n*'])
    return String.unquoted('')
Returns the name of a sprite map The name is derived from the folder than
    contains the sprites.