Source code for ding.utils.loader.utils

from .base import Loader, ILoaderClass


[docs]def keep() -> ILoaderClass:
    """
    Overview:
        Create a keep loader.
    """

    return Loader(lambda v: v)


[docs]def raw(value) -> ILoaderClass:
    """
    Overview:
        Create a raw loader.
    """

    return Loader(lambda v: value)


[docs]def optional(loader) -> ILoaderClass:
    """
    Overview:
        Create a optional loader.
    Arguments:
        - loader (:obj:`ILoaderClass`): The loader.
    """

    return Loader(loader) | None


[docs]def check_only(loader) -> ILoaderClass:
    """
    Overview:
        Create a check only loader.
    Arguments:
        - loader (:obj:`ILoaderClass`): The loader.
    """

    return Loader(loader) & keep()


[docs]def check(loader) -> ILoaderClass:
    """
    Overview:
        Create a check loader.
    Arguments:
        - loader (:obj:`ILoaderClass`): The loader.
    """

    return Loader(lambda x: Loader(loader).check(x))