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import typing |
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from typish._types import Unknown |
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View Code Duplication |
def subclass_of(cls: type, *args: type) -> bool: |
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""" |
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Return whether ``cls`` is a subclass of all types in ``args`` while also |
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considering generics. |
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:param cls: the subject. |
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:param args: the super types. |
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:return: True if ``cls`` is a subclass of all types in ``args`` while also |
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considering generics. |
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""" |
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from typish.classes._literal import LiteralAlias |
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if args and issubclass(args[0], LiteralAlias): |
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return _check_literal(cls, subclass_of, *args) |
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if len(args) > 1: |
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result = subclass_of(cls, args[0]) and subclass_of(cls, *args[1:]) |
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else: |
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if args[0] == cls: |
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return True |
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result = _subclass_of(cls, args[0]) |
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return result |
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View Code Duplication |
def _subclass_of(cls: type, clsinfo: type) -> bool: |
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from typish.functions._get_origin import get_origin |
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from typish.functions._get_args import get_args |
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# Check whether cls is a subtype of clsinfo. |
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clsinfo_origin = get_origin(clsinfo) |
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clsinfo_args = get_args(clsinfo) |
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cls_origin = get_origin(cls) |
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if cls is Unknown or clsinfo in (typing.Any, object): |
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result = True |
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elif cls_origin is typing.Union: |
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# cls is a Union; all options of that Union must subclass clsinfo. |
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cls_args = get_args(cls) |
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result = all([subclass_of(elem, clsinfo) for elem in cls_args]) |
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elif clsinfo_args: |
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result = _subclass_of_generic(cls, clsinfo_origin, clsinfo_args) |
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else: |
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try: |
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result = issubclass(cls_origin, clsinfo_origin) |
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except TypeError: |
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result = False |
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return result |
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View Code Duplication |
def _subclass_of_union( |
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cls: type, |
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info_args: typing.Tuple[type, ...]) -> bool: |
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# Handle subclass_of(*, union) |
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result = True |
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for cls_ in info_args: |
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if subclass_of(cls, cls_): |
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break |
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else: |
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result = False |
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return result |
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View Code Duplication |
def _subclass_of_generic( |
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cls: type, |
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info_generic_type: type, |
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info_args: typing.Tuple[type, ...]) -> bool: |
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# Check if cls is a subtype of info_generic_type, knowing that the latter |
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# is a generic type. |
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from typish.functions._get_origin import get_origin |
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from typish.functions._get_args import get_args |
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result = False |
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cls_origin = get_origin(cls) |
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cls_args = get_args(cls) |
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if info_generic_type is tuple: |
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# Special case. |
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result = (subclass_of(cls_origin, tuple) |
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and _subclass_of_tuple(cls_args, info_args)) |
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elif cls_origin is tuple and info_generic_type is typing.Iterable: |
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# Another special case. |
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args = cls_args |
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if len(args) > 1 and args[1] is ...: |
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args = [args[0]] |
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# Match the number of arguments of info to that of cls. |
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matched_info_args = info_args * len(args) |
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result = _subclass_of_tuple(args, matched_info_args) |
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elif info_generic_type is typing.Union: |
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# Another special case. |
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result = _subclass_of_union(cls, info_args) |
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elif (subclass_of(cls_origin, info_generic_type) and cls_args |
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and len(cls_args) == len(info_args)): |
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for tup in zip(cls_args, info_args): |
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if not subclass_of(*tup): |
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result = False |
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break |
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else: |
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result = True |
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# Note that issubtype(list, List[...]) is always False. |
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# Note that the number of arguments must be equal. |
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return result |
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View Code Duplication |
def _subclass_of_tuple( |
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cls_args: typing.Tuple[type, ...], |
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info_args: typing.Tuple[type, ...]) -> bool: |
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from typish.functions._get_origin import get_origin |
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from typish.functions._common_ancestor import common_ancestor_of_types |
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result = False |
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if len(info_args) == 2 and info_args[1] is ...: |
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type_ = get_origin(info_args[0]) |
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if type_ is typing.Union: |
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# A heterogeneous tuple: check each element if it subclasses the |
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# union. |
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result = all([subclass_of(elem, info_args[0]) for elem in cls_args]) |
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else: |
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result = subclass_of(common_ancestor_of_types(*cls_args), info_args[0]) |
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elif len(cls_args) == len(info_args): |
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for c1, c2 in zip(cls_args, info_args): |
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if not subclass_of(c1, c2): |
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break |
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else: |
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result = True |
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return result |
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def _check_literal(obj: object, func: typing.Callable, *args: type) -> bool: |
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# Instance or subclass check for Literal. |
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literal = args[0] |
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leftovers = args[1:] |
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literal_args = getattr(literal, '__args__', None) |
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if literal_args: |
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literal_arg = literal_args[0] |
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return obj == literal_arg and (not leftovers or func(obj, *leftovers)) |
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return False |
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ramonhagenaars /
typish
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