def _get_type_dict(inst: typing.Dict[KT, VT],
use_union: bool) -> typing.Type[typing.Dict[KT, VT]]:
from typish.functions._get_args import get_args
t_list_k = _get_type_iterable(list(inst.keys()), use_union)
t_list_v = _get_type_iterable(list(inst.values()), use_union)
t_k_tuple = get_args(t_list_k)
t_v_tuple = get_args(t_list_v)
return typing.Dict[t_k_tuple[0], t_v_tuple[0]]
def _subclass_of_generic(cls: type, info_generic_type: type,
info_args: typing.Tuple[type, ...]) -> bool:
# Check if cls is a subtype of info_generic_type, knowing that the latter
# is a generic type.
from typish.functions._get_origin import get_origin
from typish.functions._get_args import get_args
result = False
cls_origin = get_origin(cls)
cls_args = get_args(cls)
if info_generic_type is tuple:
# Special case.
result = (subclass_of(cls_origin, tuple)
and _subclass_of_tuple(cls_args, info_args))
elif info_generic_type is typing.Union:
# Another special case.
result = any(subclass_of(cls, cls_) for cls_ in info_args)
elif cls_origin is tuple and info_generic_type is typing.Iterable:
# Another special case.
args = _tuple_args(cls_args)
# Match the number of arguments of info to that of cls.
matched_info_args = info_args * len(args)
result = _subclass_of_tuple(args, matched_info_args)
elif (subclass_of(cls_origin, info_generic_type) and cls_args
and len(cls_args) == len(info_args)):
result = all(subclass_of(*tup) for tup in zip(cls_args, info_args))
# Note that issubtype(list, List[...]) is always False.
# Note that the number of arguments must be equal.
return result
def from_literal(literal: typing.Any) -> typing.Type['LiteralAlias']:
"""
Create a LiteralAlias from the given typing.Literal.
:param literal: the typing.Literal type.
:return: a LiteralAlias type.
"""
from typish.functions._get_args import get_args
args = get_args(literal)
return LiteralAlias[args] if args else LiteralAlias
def _subclass_of(cls: type, clsinfo: type) -> bool:
from typish.functions._get_origin import get_origin
from typish.functions._get_args import get_args
# Check whether cls is a subtype of clsinfo.
clsinfo_origin = get_origin(clsinfo)
clsinfo_args = get_args(clsinfo)
cls_origin = get_origin(cls)
if cls is Unknown or clsinfo in (typing.Any, object):
result = True
elif cls_origin is typing.Union:
# cls is a Union; all options of that Union must subclass clsinfo.
cls_args = get_args(cls)
result = all([subclass_of(elem, clsinfo) for elem in cls_args])
elif clsinfo_args:
result = _subclass_of_generic(cls, clsinfo_origin, clsinfo_args)
else:
try:
result = issubclass(cls_origin, clsinfo_origin)
except TypeError:
result = False
return result
def _forward_subclass_check(cls: type, clsinfo: type) -> bool:
# Forward the subclass check for cls and clsinfo to delegates that know how
# to check that particular cls/clsinfo type.
from typish.functions._get_origin import get_origin
from typish.functions._get_args import get_args
clsinfo_origin = get_origin(clsinfo)
clsinfo_args = get_args(clsinfo)
cls_origin = get_origin(cls)
if cls_origin is typing.Union:
# cls is a Union; all options of that Union must subclass clsinfo.
cls_args = get_args(cls)
result = all([subclass_of(elem, clsinfo) for elem in cls_args])
elif clsinfo_args:
result = _subclass_of_generic(cls, clsinfo_origin, clsinfo_args)
else:
try:
result = issubclass(cls_origin, clsinfo_origin)
except TypeError:
result = False
return result
