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File Name : _utils.py

"""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 keyword
import typing
import weakref
from collections import OrderedDict, defaultdict, deque
from copy import deepcopy
from itertools import zip_longest
from types import BuiltinFunctionType, CodeType, FunctionType, GeneratorType, LambdaType, ModuleType
from typing import Any, TypeVar

from typing_extensions import TypeAlias, TypeGuard

from . import _repr, _typing_extra

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 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.
    """
    from ..main import BaseModel

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 ClassAttribute(name: str, value: T) -> T:
        ...

else:

class ClassAttribute:
        """Hide class attribute from its instances."""

__slots__ = 'name', 'value'

def __init__(self, name: str, value: Any) -> None:
            self.name = name
            self.value = 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
    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

_EMPTY = 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=_EMPTY):
        if left_item is not right_item:
            return False
    return True

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-04-17 01:36:23
..	dir	-	root/root	0755	2024-04-17 01:36:23
__pycache__	dir	-	root/root	0755	2024-04-17 01:36:23
__init__.py	application/x-empty	0 B	root/root	0644	2024-04-17 01:36:23
_config.py	text/x-python	11.04 KB	root/root	0644	2024-04-17 01:36:23
_core_metadata.py	text/x-python	3.44 KB	root/root	0644	2024-04-17 01:36:23
_core_utils.py	text/x-python	24.24 KB	root/root	0644	2024-04-17 01:36:23
_dataclasses.py	text/plain	10.46 KB	root/root	0644	2024-04-17 01:36:23
_decorators.py	text/plain	30.05 KB	root/root	0644	2024-04-17 01:36:23
_decorators_v1.py	text/plain	6.12 KB	root/root	0644	2024-04-17 01:36:23
_discriminated_union.py	text/x-python	25.61 KB	root/root	0644	2024-04-17 01:36:23
_fields.py	text/plain	11.62 KB	root/root	0644	2024-04-17 01:36:23
_forward_ref.py	text/x-python	425 B	root/root	0644	2024-04-17 01:36:23
_generate_schema.py	text/plain	87.89 KB	root/root	0644	2024-04-17 01:36:23
_generics.py	text/x-python	21.65 KB	root/root	0644	2024-04-17 01:36:23
_internal_dataclass.py	text/x-python	207 B	root/root	0644	2024-04-17 01:36:23
_known_annotated_metadata.py	text/x-python	15.89 KB	root/root	0644	2024-04-17 01:36:23
_mock_val_ser.py	text/x-python	4.2 KB	root/root	0644	2024-04-17 01:36:23
_model_construction.py	text/plain	26.41 KB	root/root	0644	2024-04-17 01:36:23
_repr.py	text/plain	4.27 KB	root/root	0644	2024-04-17 01:36:23
_schema_generation_shared.py	text/plain	4.74 KB	root/root	0644	2024-04-17 01:36:23
_std_types_schema.py	text/plain	28.27 KB	root/root	0644	2024-04-17 01:36:23
_typing_extra.py	text/plain	16.15 KB	root/root	0644	2024-04-17 01:36:23
_utils.py	text/plain	11.42 KB	root/root	0644	2024-04-17 01:36:23
_validate_call.py	text/x-python	5.36 KB	root/root	0644	2024-04-17 01:36:23
_validators.py	text/plain	9.81 KB	root/root	0644	2024-04-17 01:36:23