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root_model.py

"""RootModel class and type definitions."""

from __future__ import annotations as _annotations

import typing
from copy import copy, deepcopy

from pydantic_core import PydanticUndefined

from . import PydanticUserError
from ._internal import _repr
from .main import BaseModel, _object_setattr

if typing.TYPE_CHECKING:
    from typing import Any

from typing_extensions import Literal

Model = typing.TypeVar('Model', bound='BaseModel')

__all__ = ('RootModel',)

RootModelRootType = typing.TypeVar('RootModelRootType')

class RootModel(BaseModel, typing.Generic[RootModelRootType]):
    """Usage docs: https://docs.pydantic.dev/2.4/concepts/models/#rootmodel-and-custom-root-types

A Pydantic `BaseModel` for the root object of the model.

Attributes:
        root: The root object of the model.
        __pydantic_root_model__: Whether the model is a RootModel.
        __pydantic_private__: Private fields in the model.
        __pydantic_extra__: Extra fields in the model.

"""

__pydantic_root_model__ = True
    __pydantic_private__ = None
    __pydantic_extra__ = None

root: RootModelRootType

def __init_subclass__(cls, **kwargs):
        extra = cls.model_config.get('extra')
        if extra is not None:
            raise PydanticUserError(
                "`RootModel` does not support setting `model_config['extra']`", code='root-model-extra'
            )
        super().__init_subclass__(**kwargs)

def __init__(__pydantic_self__, root: RootModelRootType = PydanticUndefined, **data) -> None:  # type: ignore
        __tracebackhide__ = True
        if data:
            if root is not PydanticUndefined:
                raise ValueError(
                    '"RootModel.__init__" accepts either a single positional argument or arbitrary keyword arguments'
                )
            root = data  # type: ignore
        __pydantic_self__.__pydantic_validator__.validate_python(root, self_instance=__pydantic_self__)

__init__.__pydantic_base_init__ = True

@classmethod
    def model_construct(cls: type[Model], root: RootModelRootType, _fields_set: set[str] | None = None) -> Model:
        """Create a new model using the provided root object and update fields set.

Args:
            root: The root object of the model.
            _fields_set: The set of fields to be updated.

Returns:
            The new model.

Raises:
            NotImplemented: If the model is not a subclass of `RootModel`.
        """
        return super().model_construct(root=root, _fields_set=_fields_set)

def __getstate__(self) -> dict[Any, Any]:
        return {
            '__dict__': self.__dict__,
            '__pydantic_fields_set__': self.__pydantic_fields_set__,
        }

def __setstate__(self, state: dict[Any, Any]) -> None:
        _object_setattr(self, '__pydantic_fields_set__', state['__pydantic_fields_set__'])
        _object_setattr(self, '__dict__', state['__dict__'])

def __copy__(self: Model) -> Model:
        """Returns a shallow copy of the model."""
        cls = type(self)
        m = cls.__new__(cls)
        _object_setattr(m, '__dict__', copy(self.__dict__))
        _object_setattr(m, '__pydantic_fields_set__', copy(self.__pydantic_fields_set__))
        return m

def __deepcopy__(self: Model, memo: dict[int, Any] | None = None) -> Model:
        """Returns a deep copy of the model."""
        cls = type(self)
        m = cls.__new__(cls)
        _object_setattr(m, '__dict__', deepcopy(self.__dict__, memo=memo))
        # This next line doesn't need a deepcopy because __pydantic_fields_set__ is a set[str],
        # and attempting a deepcopy would be marginally slower.
        _object_setattr(m, '__pydantic_fields_set__', copy(self.__pydantic_fields_set__))
        return m

if typing.TYPE_CHECKING:

def model_dump(
            self,
            *,
            mode: Literal['json', 'python'] | str = 'python',
            include: Any = None,
            exclude: Any = None,
            by_alias: bool = False,
            exclude_unset: bool = False,
            exclude_defaults: bool = False,
            exclude_none: bool = False,
            round_trip: bool = False,
            warnings: bool = True,
        ) -> RootModelRootType:
            """This method is included just to get a more accurate return type for type checkers.
            It is included in this `if TYPE_CHECKING:` block since no override is actually necessary.

See the documentation of `BaseModel.model_dump` for more details about the arguments.
            """
            ...

def __eq__(self, other: Any) -> bool:
        if not isinstance(other, RootModel):
            return NotImplemented
        return self.model_fields['root'].annotation == other.model_fields['root'].annotation and super().__eq__(other)

def __repr_args__(self) -> _repr.ReprArgs:
        yield 'root', self.root

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