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from __future__ import annotations
import sys
from typing import TYPE_CHECKING, Any, Mapping
from typing_extensions import TypeAliasType, get_args, get_origin
from polyfactory.constants import TYPE_MAPPING
from polyfactory.utils.predicates import is_annotated, is_new_type, is_optional, is_safe_subclass, is_union
from polyfactory.utils.types import NoneType
if TYPE_CHECKING:
from random import Random
from typing import Sequence
def unwrap_new_type(annotation: Any) -> Any:
"""Return base type if given annotation is a type derived with NewType, otherwise annotation.
:param annotation: A type annotation, possibly one created using 'types.NewType'
:returns: The unwrapped annotation.
"""
while is_new_type(annotation):
annotation = annotation.__supertype__
return annotation
def unwrap_union(annotation: Any, random: Random) -> Any:
"""Unwraps union types - recursively.
:param annotation: A type annotation, possibly a type union.
:param random: An instance of random.Random.
:returns: A type annotation
"""
while is_union(annotation):
args = list(get_args(annotation))
annotation = random.choice(args)
return annotation
def unwrap_optional(annotation: Any) -> Any:
"""Unwraps optional union types - recursively.
:param annotation: A type annotation, possibly an optional union.
:returns: A type annotation
"""
while is_optional(annotation):
annotation = next(arg for arg in get_args(annotation) if arg not in (NoneType, None))
return annotation
def unwrap_annotation(annotation: Any, random: Random) -> Any:
"""Unwraps an annotation.
:param annotation: A type annotation.
:param random: An instance of random.Random.
:returns: The unwrapped annotation.
"""
while (
is_optional(annotation)
or is_union(annotation)
or is_new_type(annotation)
or is_annotated(annotation)
or isinstance(annotation, TypeAliasType)
):
if is_new_type(annotation):
annotation = unwrap_new_type(annotation)
elif is_optional(annotation):
annotation = unwrap_optional(annotation)
elif is_annotated(annotation):
annotation = unwrap_annotated(annotation, random=random)[0]
elif isinstance(annotation, TypeAliasType):
annotation = annotation.__value__
else:
annotation = unwrap_union(annotation, random=random)
return annotation
def flatten_annotation(annotation: Any) -> list[Any]:
"""Flattens an annotation.
:param annotation: A type annotation.
:returns: The flattened annotations.
"""
flat = []
if is_new_type(annotation):
flat.extend(flatten_annotation(unwrap_new_type(annotation)))
elif is_optional(annotation):
for a in get_args(annotation):
flat.extend(flatten_annotation(a))
elif is_annotated(annotation):
flat.extend(flatten_annotation(get_args(annotation)[0]))
elif is_union(annotation):
for a in get_args(annotation):
flat.extend(flatten_annotation(a))
else:
flat.append(annotation)
return flat
def unwrap_args(annotation: Any, random: Random) -> tuple[Any, ...]:
"""Unwrap the annotation and return any type args.
:param annotation: A type annotation
:param random: An instance of random.Random.
:returns: A tuple of type args.
"""
return get_args(unwrap_annotation(annotation=annotation, random=random))
def unwrap_annotated(annotation: Any, random: Random) -> tuple[Any, list[Any]]:
"""Unwrap an annotated type and return a tuple of type args and optional metadata.
:param annotation: An annotated type annotation
:param random: An instance of random.Random.
:returns: A tuple of type args.
"""
args = [arg for arg in get_args(annotation) if arg is not None]
return unwrap_annotation(args[0], random=random), args[1:]
def normalize_annotation(annotation: Any, random: Random) -> Any:
"""Normalize an annotation.
:param annotation: A type annotation.
:returns: A normalized type annotation.
"""
if is_new_type(annotation):
annotation = unwrap_new_type(annotation)
if is_annotated(annotation):
annotation = unwrap_annotated(annotation, random=random)[0]
# we have to maintain compatibility with the older non-subscriptable typings.
if sys.version_info <= (3, 9): # pragma: no cover
return annotation
origin = get_origin(annotation) or annotation
if origin in TYPE_MAPPING:
origin = TYPE_MAPPING[origin]
if args := get_args(annotation):
args = tuple(normalize_annotation(arg, random=random) for arg in args)
return origin[args] if origin is not type else annotation
return origin
def get_annotation_metadata(annotation: Any) -> Sequence[Any]:
"""Get the metadata in the annotation.
:param annotation: A type annotation.
:returns: The metadata.
"""
return get_args(annotation)[1:]
def get_collection_type(annotation: Any) -> type[list | tuple | set | frozenset | dict]:
"""Get the collection type from the annotation.
:param annotation: A type annotation.
:returns: The collection type.
"""
if is_safe_subclass(annotation, list):
return list
if is_safe_subclass(annotation, Mapping):
return dict
if is_safe_subclass(annotation, tuple):
return tuple
if is_safe_subclass(annotation, set):
return set
if is_safe_subclass(annotation, frozenset):
return frozenset
msg = f"Unknown collection type - {annotation}"
raise ValueError(msg)
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