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"""Bucket of reusable internal utilities.
This should be reduced as much as possible with functions only used in one place, moved to that place.
"""
from __future__ import annotations as _annotations
import dataclasses
import keyword
import typing
import warnings
import weakref
from collections import OrderedDict, defaultdict, deque
from collections.abc import Mapping
from copy import deepcopy
from functools import cached_property
from inspect import Parameter
from itertools import zip_longest
from types import BuiltinFunctionType, CodeType, FunctionType, GeneratorType, LambdaType, ModuleType
from typing import Any, Callable, Generic, TypeVar, overload
from typing_extensions import TypeAlias, TypeGuard, deprecated
from pydantic import PydanticDeprecatedSince211
from . import _repr, _typing_extra
from ._import_utils import import_cached_base_model
if typing.TYPE_CHECKING:
MappingIntStrAny: TypeAlias = 'typing.Mapping[int, Any] | typing.Mapping[str, Any]'
AbstractSetIntStr: TypeAlias = 'typing.AbstractSet[int] | typing.AbstractSet[str]'
from ..main import BaseModel
# these are types that are returned unchanged by deepcopy
IMMUTABLE_NON_COLLECTIONS_TYPES: set[type[Any]] = {
int,
float,
complex,
str,
bool,
bytes,
type,
_typing_extra.NoneType,
FunctionType,
BuiltinFunctionType,
LambdaType,
weakref.ref,
CodeType,
# note: including ModuleType will differ from behaviour of deepcopy by not producing error.
# It might be not a good idea in general, but considering that this function used only internally
# against default values of fields, this will allow to actually have a field with module as default value
ModuleType,
NotImplemented.__class__,
Ellipsis.__class__,
}
# these are types that if empty, might be copied with simple copy() instead of deepcopy()
BUILTIN_COLLECTIONS: set[type[Any]] = {
list,
set,
tuple,
frozenset,
dict,
OrderedDict,
defaultdict,
deque,
}
def can_be_positional(param: Parameter) -> bool:
"""Return whether the parameter accepts a positional argument.
```python {test="skip" lint="skip"}
def func(a, /, b, *, c):
pass
params = inspect.signature(func).parameters
can_be_positional(params['a'])
#> True
can_be_positional(params['b'])
#> True
can_be_positional(params['c'])
#> False
```
"""
return param.kind in (Parameter.POSITIONAL_ONLY, Parameter.POSITIONAL_OR_KEYWORD)
def sequence_like(v: Any) -> bool:
return isinstance(v, (list, tuple, set, frozenset, GeneratorType, deque))
def lenient_isinstance(o: Any, class_or_tuple: type[Any] | tuple[type[Any], ...] | None) -> bool: # pragma: no cover
try:
return isinstance(o, class_or_tuple) # type: ignore[arg-type]
except TypeError:
return False
def lenient_issubclass(cls: Any, class_or_tuple: Any) -> bool: # pragma: no cover
try:
return isinstance(cls, type) and issubclass(cls, class_or_tuple)
except TypeError:
if isinstance(cls, _typing_extra.WithArgsTypes):
return False
raise # pragma: no cover
def is_model_class(cls: Any) -> TypeGuard[type[BaseModel]]:
"""Returns true if cls is a _proper_ subclass of BaseModel, and provides proper type-checking,
unlike raw calls to lenient_issubclass.
"""
BaseModel = import_cached_base_model()
return lenient_issubclass(cls, BaseModel) and cls is not BaseModel
def is_valid_identifier(identifier: str) -> bool:
"""Checks that a string is a valid identifier and not a Python keyword.
:param identifier: The identifier to test.
:return: True if the identifier is valid.
"""
return identifier.isidentifier() and not keyword.iskeyword(identifier)
KeyType = TypeVar('KeyType')
def deep_update(mapping: dict[KeyType, Any], *updating_mappings: dict[KeyType, Any]) -> dict[KeyType, Any]:
updated_mapping = mapping.copy()
for updating_mapping in updating_mappings:
for k, v in updating_mapping.items():
if k in updated_mapping and isinstance(updated_mapping[k], dict) and isinstance(v, dict):
updated_mapping[k] = deep_update(updated_mapping[k], v)
else:
updated_mapping[k] = v
return updated_mapping
def update_not_none(mapping: dict[Any, Any], **update: Any) -> None:
mapping.update({k: v for k, v in update.items() if v is not None})
T = TypeVar('T')
def unique_list(
input_list: list[T] | tuple[T, ...],
*,
name_factory: typing.Callable[[T], str] = str,
) -> list[T]:
"""Make a list unique while maintaining order.
We update the list if another one with the same name is set
(e.g. model validator overridden in subclass).
"""
result: list[T] = []
result_names: list[str] = []
for v in input_list:
v_name = name_factory(v)
if v_name not in result_names:
result_names.append(v_name)
result.append(v)
else:
result[result_names.index(v_name)] = v
return result
class ValueItems(_repr.Representation):
"""Class for more convenient calculation of excluded or included fields on values."""
__slots__ = ('_items', '_type')
def __init__(self, value: Any, items: AbstractSetIntStr | MappingIntStrAny) -> None:
items = self._coerce_items(items)
if isinstance(value, (list, tuple)):
items = self._normalize_indexes(items, len(value)) # type: ignore
self._items: MappingIntStrAny = items # type: ignore
def is_excluded(self, item: Any) -> bool:
"""Check if item is fully excluded.
:param item: key or index of a value
"""
return self.is_true(self._items.get(item))
def is_included(self, item: Any) -> bool:
"""Check if value is contained in self._items.
:param item: key or index of value
"""
return item in self._items
def for_element(self, e: int | str) -> AbstractSetIntStr | MappingIntStrAny | None:
""":param e: key or index of element on value
:return: raw values for element if self._items is dict and contain needed element
"""
item = self._items.get(e) # type: ignore
return item if not self.is_true(item) else None
def _normalize_indexes(self, items: MappingIntStrAny, v_length: int) -> dict[int | str, Any]:
""":param items: dict or set of indexes which will be normalized
:param v_length: length of sequence indexes of which will be
>>> self._normalize_indexes({0: True, -2: True, -1: True}, 4)
{0: True, 2: True, 3: True}
>>> self._normalize_indexes({'__all__': True}, 4)
{0: True, 1: True, 2: True, 3: True}
"""
normalized_items: dict[int | str, Any] = {}
all_items = None
for i, v in items.items():
if not (isinstance(v, typing.Mapping) or isinstance(v, typing.AbstractSet) or self.is_true(v)):
raise TypeError(f'Unexpected type of exclude value for index "{i}" {v.__class__}')
if i == '__all__':
all_items = self._coerce_value(v)
continue
if not isinstance(i, int):
raise TypeError(
'Excluding fields from a sequence of sub-models or dicts must be performed index-wise: '
'expected integer keys or keyword "__all__"'
)
normalized_i = v_length + i if i < 0 else i
normalized_items[normalized_i] = self.merge(v, normalized_items.get(normalized_i))
if not all_items:
return normalized_items
if self.is_true(all_items):
for i in range(v_length):
normalized_items.setdefault(i, ...)
return normalized_items
for i in range(v_length):
normalized_item = normalized_items.setdefault(i, {})
if not self.is_true(normalized_item):
normalized_items[i] = self.merge(all_items, normalized_item)
return normalized_items
@classmethod
def merge(cls, base: Any, override: Any, intersect: bool = False) -> Any:
"""Merge a `base` item with an `override` item.
Both `base` and `override` are converted to dictionaries if possible.
Sets are converted to dictionaries with the sets entries as keys and
Ellipsis as values.
Each key-value pair existing in `base` is merged with `override`,
while the rest of the key-value pairs are updated recursively with this function.
Merging takes place based on the "union" of keys if `intersect` is
set to `False` (default) and on the intersection of keys if
`intersect` is set to `True`.
"""
override = cls._coerce_value(override)
base = cls._coerce_value(base)
if override is None:
return base
if cls.is_true(base) or base is None:
return override
if cls.is_true(override):
return base if intersect else override
# intersection or union of keys while preserving ordering:
if intersect:
merge_keys = [k for k in base if k in override] + [k for k in override if k in base]
else:
merge_keys = list(base) + [k for k in override if k not in base]
merged: dict[int | str, Any] = {}
for k in merge_keys:
merged_item = cls.merge(base.get(k), override.get(k), intersect=intersect)
if merged_item is not None:
merged[k] = merged_item
return merged
@staticmethod
def _coerce_items(items: AbstractSetIntStr | MappingIntStrAny) -> MappingIntStrAny:
if isinstance(items, typing.Mapping):
pass
elif isinstance(items, typing.AbstractSet):
items = dict.fromkeys(items, ...) # type: ignore
else:
class_name = getattr(items, '__class__', '???')
raise TypeError(f'Unexpected type of exclude value {class_name}')
return items # type: ignore
@classmethod
def _coerce_value(cls, value: Any) -> Any:
if value is None or cls.is_true(value):
return value
return cls._coerce_items(value)
@staticmethod
def is_true(v: Any) -> bool:
return v is True or v is ...
def __repr_args__(self) -> _repr.ReprArgs:
return [(None, self._items)]
if typing.TYPE_CHECKING:
def LazyClassAttribute(name: str, get_value: Callable[[], T]) -> T: ...
else:
class LazyClassAttribute:
"""A descriptor exposing an attribute only accessible on a class (hidden from instances).
The attribute is lazily computed and cached during the first access.
"""
def __init__(self, name: str, get_value: Callable[[], Any]) -> None:
self.name = name
self.get_value = get_value
@cached_property
def value(self) -> Any:
return self.get_value()
def __get__(self, instance: Any, owner: type[Any]) -> None:
if instance is None:
return self.value
raise AttributeError(f'{self.name!r} attribute of {owner.__name__!r} is class-only')
Obj = TypeVar('Obj')
def smart_deepcopy(obj: Obj) -> Obj:
"""Return type as is for immutable built-in types
Use obj.copy() for built-in empty collections
Use copy.deepcopy() for non-empty collections and unknown objects.
"""
obj_type = obj.__class__
if obj_type in IMMUTABLE_NON_COLLECTIONS_TYPES:
return obj # fastest case: obj is immutable and not collection therefore will not be copied anyway
try:
if not obj and obj_type in BUILTIN_COLLECTIONS:
# faster way for empty collections, no need to copy its members
return obj if obj_type is tuple else obj.copy() # tuple doesn't have copy method # type: ignore
except (TypeError, ValueError, RuntimeError):
# do we really dare to catch ALL errors? Seems a bit risky
pass
return deepcopy(obj) # slowest way when we actually might need a deepcopy
_SENTINEL = object()
def all_identical(left: typing.Iterable[Any], right: typing.Iterable[Any]) -> bool:
"""Check that the items of `left` are the same objects as those in `right`.
>>> a, b = object(), object()
>>> all_identical([a, b, a], [a, b, a])
True
>>> all_identical([a, b, [a]], [a, b, [a]]) # new list object, while "equal" is not "identical"
False
"""
for left_item, right_item in zip_longest(left, right, fillvalue=_SENTINEL):
if left_item is not right_item:
return False
return True
@dataclasses.dataclass(frozen=True)
class SafeGetItemProxy:
"""Wrapper redirecting `__getitem__` to `get` with a sentinel value as default
This makes is safe to use in `operator.itemgetter` when some keys may be missing
"""
# Define __slots__manually for performances
# @dataclasses.dataclass() only support slots=True in python>=3.10
__slots__ = ('wrapped',)
wrapped: Mapping[str, Any]
def __getitem__(self, key: str, /) -> Any:
return self.wrapped.get(key, _SENTINEL)
# required to pass the object to operator.itemgetter() instances due to a quirk of typeshed
# https://github.com/python/mypy/issues/13713
# https://github.com/python/typeshed/pull/8785
# Since this is typing-only, hide it in a typing.TYPE_CHECKING block
if typing.TYPE_CHECKING:
def __contains__(self, key: str, /) -> bool:
return self.wrapped.__contains__(key)
_ModelT = TypeVar('_ModelT', bound='BaseModel')
_RT = TypeVar('_RT')
class deprecated_instance_property(Generic[_ModelT, _RT]):
"""A decorator exposing the decorated class method as a property, with a warning on instance access.
This decorator takes a class method defined on the `BaseModel` class and transforms it into
an attribute. The attribute can be accessed on both the class and instances of the class. If accessed
via an instance, a deprecation warning is emitted stating that instance access will be removed in V3.
"""
def __init__(self, fget: Callable[[type[_ModelT]], _RT], /) -> None:
# Note: fget should be a classmethod:
self.fget = fget
@overload
def __get__(self, instance: None, objtype: type[_ModelT]) -> _RT: ...
@overload
@deprecated(
'Accessing this attribute on the instance is deprecated, and will be removed in Pydantic V3. '
'Instead, you should access this attribute from the model class.',
category=None,
)
def __get__(self, instance: _ModelT, objtype: type[_ModelT]) -> _RT: ...
def __get__(self, instance: _ModelT | None, objtype: type[_ModelT]) -> _RT:
if instance is not None:
warnings.warn(
'Accessing this attribute on the instance is deprecated, and will be removed in Pydantic V3. '
'Instead, you should access this attribute from the model class.',
category=PydanticDeprecatedSince211,
stacklevel=2,
)
return self.fget.__get__(instance, objtype)()