regroup.py 文件源码

def check_sort_key(option, opt, value):
    result = []

    for value in field_split(value):
        value = value.strip().split(":")
        field, sort_opts = value[0], value[1:]
        sort_type = desc = None

        for sort_opt in sort_opts:
            if sort_opt == "desc":
                desc = True
            elif SortType.is_valid(sort_opt):
                sort_type = sort_opt
            else:
                raise OptionValueError("Unknown sort option: {0!r}".format(sort_opt))

        result.append(DataFieldOrder(field, sort_type=sort_type, desc=desc))

    return result