two version of R2R are here HEAD master

1 files changed, 3123 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/attr/_make.py b/.venv/lib/python3.12/site-packages/attr/_make.py
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+# SPDX-License-Identifier: MIT
+
+from __future__ import annotations
+
+import abc
+import contextlib
+import copy
+import enum
+import inspect
+import itertools
+import linecache
+import sys
+import types
+import unicodedata
+
+from collections.abc import Callable, Mapping
+from functools import cached_property
+from typing import Any, NamedTuple, TypeVar
+
+# We need to import _compat itself in addition to the _compat members to avoid
+# having the thread-local in the globals here.
+from . import _compat, _config, setters
+from ._compat import (
+    PY_3_10_PLUS,
+    PY_3_11_PLUS,
+    PY_3_13_PLUS,
+    _AnnotationExtractor,
+    _get_annotations,
+    get_generic_base,
+)
+from .exceptions import (
+    DefaultAlreadySetError,
+    FrozenInstanceError,
+    NotAnAttrsClassError,
+    UnannotatedAttributeError,
+)
+
+
+# This is used at least twice, so cache it here.
+_OBJ_SETATTR = object.__setattr__
+_INIT_FACTORY_PAT = "__attr_factory_%s"
+_CLASSVAR_PREFIXES = (
+    "typing.ClassVar",
+    "t.ClassVar",
+    "ClassVar",
+    "typing_extensions.ClassVar",
+)
+# we don't use a double-underscore prefix because that triggers
+# name mangling when trying to create a slot for the field
+# (when slots=True)
+_HASH_CACHE_FIELD = "_attrs_cached_hash"
+
+_EMPTY_METADATA_SINGLETON = types.MappingProxyType({})
+
+# Unique object for unequivocal getattr() defaults.
+_SENTINEL = object()
+
+_DEFAULT_ON_SETATTR = setters.pipe(setters.convert, setters.validate)
+
+
+class _Nothing(enum.Enum):
+    """
+    Sentinel to indicate the lack of a value when `None` is ambiguous.
+
+    If extending attrs, you can use ``typing.Literal[NOTHING]`` to show
+    that a value may be ``NOTHING``.
+
+    .. versionchanged:: 21.1.0 ``bool(NOTHING)`` is now False.
+    .. versionchanged:: 22.2.0 ``NOTHING`` is now an ``enum.Enum`` variant.
+    """
+
+    NOTHING = enum.auto()
+
+    def __repr__(self):
+        return "NOTHING"
+
+    def __bool__(self):
+        return False
+
+
+NOTHING = _Nothing.NOTHING
+"""
+Sentinel to indicate the lack of a value when `None` is ambiguous.
+
+When using in 3rd party code, use `attrs.NothingType` for type annotations.
+"""
+
+
+class _CacheHashWrapper(int):
+    """
+    An integer subclass that pickles / copies as None
+
+    This is used for non-slots classes with ``cache_hash=True``, to avoid
+    serializing a potentially (even likely) invalid hash value. Since `None`
+    is the default value for uncalculated hashes, whenever this is copied,
+    the copy's value for the hash should automatically reset.
+
+    See GH #613 for more details.
+    """
+
+    def __reduce__(self, _none_constructor=type(None), _args=()):  # noqa: B008
+        return _none_constructor, _args
+
+
+def attrib(
+    default=NOTHING,
+    validator=None,
+    repr=True,
+    cmp=None,
+    hash=None,
+    init=True,
+    metadata=None,
+    type=None,
+    converter=None,
+    factory=None,
+    kw_only=False,
+    eq=None,
+    order=None,
+    on_setattr=None,
+    alias=None,
+):
+    """
+    Create a new field / attribute on a class.
+
+    Identical to `attrs.field`, except it's not keyword-only.
+
+    Consider using `attrs.field` in new code (``attr.ib`` will *never* go away,
+    though).
+
+    ..  warning::
+
+        Does **nothing** unless the class is also decorated with
+        `attr.s` (or similar)!
+
+
+    .. versionadded:: 15.2.0 *convert*
+    .. versionadded:: 16.3.0 *metadata*
+    .. versionchanged:: 17.1.0 *validator* can be a ``list`` now.
+    .. versionchanged:: 17.1.0
+       *hash* is `None` and therefore mirrors *eq* by default.
+    .. versionadded:: 17.3.0 *type*
+    .. deprecated:: 17.4.0 *convert*
+    .. versionadded:: 17.4.0
+       *converter* as a replacement for the deprecated *convert* to achieve
+       consistency with other noun-based arguments.
+    .. versionadded:: 18.1.0
+       ``factory=f`` is syntactic sugar for ``default=attr.Factory(f)``.
+    .. versionadded:: 18.2.0 *kw_only*
+    .. versionchanged:: 19.2.0 *convert* keyword argument removed.
+    .. versionchanged:: 19.2.0 *repr* also accepts a custom callable.
+    .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
+    .. versionadded:: 19.2.0 *eq* and *order*
+    .. versionadded:: 20.1.0 *on_setattr*
+    .. versionchanged:: 20.3.0 *kw_only* backported to Python 2
+    .. versionchanged:: 21.1.0
+       *eq*, *order*, and *cmp* also accept a custom callable
+    .. versionchanged:: 21.1.0 *cmp* undeprecated
+    .. versionadded:: 22.2.0 *alias*
+    """
+    eq, eq_key, order, order_key = _determine_attrib_eq_order(
+        cmp, eq, order, True
+    )
+
+    if hash is not None and hash is not True and hash is not False:
+        msg = "Invalid value for hash.  Must be True, False, or None."
+        raise TypeError(msg)
+
+    if factory is not None:
+        if default is not NOTHING:
+            msg = (
+                "The `default` and `factory` arguments are mutually exclusive."
+            )
+            raise ValueError(msg)
+        if not callable(factory):
+            msg = "The `factory` argument must be a callable."
+            raise ValueError(msg)
+        default = Factory(factory)
+
+    if metadata is None:
+        metadata = {}
+
+    # Apply syntactic sugar by auto-wrapping.
+    if isinstance(on_setattr, (list, tuple)):
+        on_setattr = setters.pipe(*on_setattr)
+
+    if validator and isinstance(validator, (list, tuple)):
+        validator = and_(*validator)
+
+    if converter and isinstance(converter, (list, tuple)):
+        converter = pipe(*converter)
+
+    return _CountingAttr(
+        default=default,
+        validator=validator,
+        repr=repr,
+        cmp=None,
+        hash=hash,
+        init=init,
+        converter=converter,
+        metadata=metadata,
+        type=type,
+        kw_only=kw_only,
+        eq=eq,
+        eq_key=eq_key,
+        order=order,
+        order_key=order_key,
+        on_setattr=on_setattr,
+        alias=alias,
+    )
+
+
+def _compile_and_eval(
+    script: str,
+    globs: dict[str, Any] | None,
+    locs: Mapping[str, object] | None = None,
+    filename: str = "",
+) -> None:
+    """
+    Evaluate the script with the given global (globs) and local (locs)
+    variables.
+    """
+    bytecode = compile(script, filename, "exec")
+    eval(bytecode, globs, locs)
+
+
+def _linecache_and_compile(
+    script: str,
+    filename: str,
+    globs: dict[str, Any] | None,
+    locals: Mapping[str, object] | None = None,
+) -> dict[str, Any]:
+    """
+    Cache the script with _linecache_, compile it and return the _locals_.
+    """
+
+    locs = {} if locals is None else locals
+
+    # In order of debuggers like PDB being able to step through the code,
+    # we add a fake linecache entry.
+    count = 1
+    base_filename = filename
+    while True:
+        linecache_tuple = (
+            len(script),
+            None,
+            script.splitlines(True),
+            filename,
+        )
+        old_val = linecache.cache.setdefault(filename, linecache_tuple)
+        if old_val == linecache_tuple:
+            break
+
+        filename = f"{base_filename[:-1]}-{count}>"
+        count += 1
+
+    _compile_and_eval(script, globs, locs, filename)
+
+    return locs
+
+
+def _make_attr_tuple_class(cls_name: str, attr_names: list[str]) -> type:
+    """
+    Create a tuple subclass to hold `Attribute`s for an `attrs` class.
+
+    The subclass is a bare tuple with properties for names.
+
+    class MyClassAttributes(tuple):
+        __slots__ = ()
+        x = property(itemgetter(0))
+    """
+    attr_class_name = f"{cls_name}Attributes"
+    body = {}
+    for i, attr_name in enumerate(attr_names):
+
+        def getter(self, i=i):
+            return self[i]
+
+        body[attr_name] = property(getter)
+    return type(attr_class_name, (tuple,), body)
+
+
+# Tuple class for extracted attributes from a class definition.
+# `base_attrs` is a subset of `attrs`.
+class _Attributes(NamedTuple):
+    attrs: type
+    base_attrs: list[Attribute]
+    base_attrs_map: dict[str, type]
+
+
+def _is_class_var(annot):
+    """
+    Check whether *annot* is a typing.ClassVar.
+
+    The string comparison hack is used to avoid evaluating all string
+    annotations which would put attrs-based classes at a performance
+    disadvantage compared to plain old classes.
+    """
+    annot = str(annot)
+
+    # Annotation can be quoted.
+    if annot.startswith(("'", '"')) and annot.endswith(("'", '"')):
+        annot = annot[1:-1]
+
+    return annot.startswith(_CLASSVAR_PREFIXES)
+
+
+def _has_own_attribute(cls, attrib_name):
+    """
+    Check whether *cls* defines *attrib_name* (and doesn't just inherit it).
+    """
+    return attrib_name in cls.__dict__
+
+
+def _collect_base_attrs(
+    cls, taken_attr_names
+) -> tuple[list[Attribute], dict[str, type]]:
+    """
+    Collect attr.ibs from base classes of *cls*, except *taken_attr_names*.
+    """
+    base_attrs = []
+    base_attr_map = {}  # A dictionary of base attrs to their classes.
+
+    # Traverse the MRO and collect attributes.
+    for base_cls in reversed(cls.__mro__[1:-1]):
+        for a in getattr(base_cls, "__attrs_attrs__", []):
+            if a.inherited or a.name in taken_attr_names:
+                continue
+
+            a = a.evolve(inherited=True)  # noqa: PLW2901
+            base_attrs.append(a)
+            base_attr_map[a.name] = base_cls
+
+    # For each name, only keep the freshest definition i.e. the furthest at the
+    # back.  base_attr_map is fine because it gets overwritten with every new
+    # instance.
+    filtered = []
+    seen = set()
+    for a in reversed(base_attrs):
+        if a.name in seen:
+            continue
+        filtered.insert(0, a)
+        seen.add(a.name)
+
+    return filtered, base_attr_map
+
+
+def _collect_base_attrs_broken(cls, taken_attr_names):
+    """
+    Collect attr.ibs from base classes of *cls*, except *taken_attr_names*.
+
+    N.B. *taken_attr_names* will be mutated.
+
+    Adhere to the old incorrect behavior.
+
+    Notably it collects from the front and considers inherited attributes which
+    leads to the buggy behavior reported in #428.
+    """
+    base_attrs = []
+    base_attr_map = {}  # A dictionary of base attrs to their classes.
+
+    # Traverse the MRO and collect attributes.
+    for base_cls in cls.__mro__[1:-1]:
+        for a in getattr(base_cls, "__attrs_attrs__", []):
+            if a.name in taken_attr_names:
+                continue
+
+            a = a.evolve(inherited=True)  # noqa: PLW2901
+            taken_attr_names.add(a.name)
+            base_attrs.append(a)
+            base_attr_map[a.name] = base_cls
+
+    return base_attrs, base_attr_map
+
+
+def _transform_attrs(
+    cls, these, auto_attribs, kw_only, collect_by_mro, field_transformer
+) -> _Attributes:
+    """
+    Transform all `_CountingAttr`s on a class into `Attribute`s.
+
+    If *these* is passed, use that and don't look for them on the class.
+
+    If *collect_by_mro* is True, collect them in the correct MRO order,
+    otherwise use the old -- incorrect -- order.  See #428.
+
+    Return an `_Attributes`.
+    """
+    cd = cls.__dict__
+    anns = _get_annotations(cls)
+
+    if these is not None:
+        ca_list = list(these.items())
+    elif auto_attribs is True:
+        ca_names = {
+            name
+            for name, attr in cd.items()
+            if attr.__class__ is _CountingAttr
+        }
+        ca_list = []
+        annot_names = set()
+        for attr_name, type in anns.items():
+            if _is_class_var(type):
+                continue
+            annot_names.add(attr_name)
+            a = cd.get(attr_name, NOTHING)
+
+            if a.__class__ is not _CountingAttr:
+                a = attrib(a)
+            ca_list.append((attr_name, a))
+
+        unannotated = ca_names - annot_names
+        if unannotated:
+            raise UnannotatedAttributeError(
+                "The following `attr.ib`s lack a type annotation: "
+                + ", ".join(
+                    sorted(unannotated, key=lambda n: cd.get(n).counter)
+                )
+                + "."
+            )
+    else:
+        ca_list = sorted(
+            (
+                (name, attr)
+                for name, attr in cd.items()
+                if attr.__class__ is _CountingAttr
+            ),
+            key=lambda e: e[1].counter,
+        )
+
+    fca = Attribute.from_counting_attr
+    own_attrs = [
+        fca(attr_name, ca, anns.get(attr_name)) for attr_name, ca in ca_list
+    ]
+
+    if collect_by_mro:
+        base_attrs, base_attr_map = _collect_base_attrs(
+            cls, {a.name for a in own_attrs}
+        )
+    else:
+        base_attrs, base_attr_map = _collect_base_attrs_broken(
+            cls, {a.name for a in own_attrs}
+        )
+
+    if kw_only:
+        own_attrs = [a.evolve(kw_only=True) for a in own_attrs]
+        base_attrs = [a.evolve(kw_only=True) for a in base_attrs]
+
+    attrs = base_attrs + own_attrs
+
+    if field_transformer is not None:
+        attrs = tuple(field_transformer(cls, attrs))
+
+    # Check attr order after executing the field_transformer.
+    # Mandatory vs non-mandatory attr order only matters when they are part of
+    # the __init__ signature and when they aren't kw_only (which are moved to
+    # the end and can be mandatory or non-mandatory in any order, as they will
+    # be specified as keyword args anyway). Check the order of those attrs:
+    had_default = False
+    for a in (a for a in attrs if a.init is not False and a.kw_only is False):
+        if had_default is True and a.default is NOTHING:
+            msg = f"No mandatory attributes allowed after an attribute with a default value or factory.  Attribute in question: {a!r}"
+            raise ValueError(msg)
+
+        if had_default is False and a.default is not NOTHING:
+            had_default = True
+
+    # Resolve default field alias after executing field_transformer.
+    # This allows field_transformer to differentiate between explicit vs
+    # default aliases and supply their own defaults.
+    for a in attrs:
+        if not a.alias:
+            # Evolve is very slow, so we hold our nose and do it dirty.
+            _OBJ_SETATTR.__get__(a)("alias", _default_init_alias_for(a.name))
+
+    # Create AttrsClass *after* applying the field_transformer since it may
+    # add or remove attributes!
+    attr_names = [a.name for a in attrs]
+    AttrsClass = _make_attr_tuple_class(cls.__name__, attr_names)
+
+    return _Attributes(AttrsClass(attrs), base_attrs, base_attr_map)
+
+
+def _make_cached_property_getattr(cached_properties, original_getattr, cls):
+    lines = [
+        # Wrapped to get `__class__` into closure cell for super()
+        # (It will be replaced with the newly constructed class after construction).
+        "def wrapper(_cls):",
+        "    __class__ = _cls",
+        "    def __getattr__(self, item, cached_properties=cached_properties, original_getattr=original_getattr, _cached_setattr_get=_cached_setattr_get):",
+        "         func = cached_properties.get(item)",
+        "         if func is not None:",
+        "              result = func(self)",
+        "              _setter = _cached_setattr_get(self)",
+        "              _setter(item, result)",
+        "              return result",
+    ]
+    if original_getattr is not None:
+        lines.append(
+            "         return original_getattr(self, item)",
+        )
+    else:
+        lines.extend(
+            [
+                "         try:",
+                "             return super().__getattribute__(item)",
+                "         except AttributeError:",
+                "             if not hasattr(super(), '__getattr__'):",
+                "                 raise",
+                "             return super().__getattr__(item)",
+                "         original_error = f\"'{self.__class__.__name__}' object has no attribute '{item}'\"",
+                "         raise AttributeError(original_error)",
+            ]
+        )
+
+    lines.extend(
+        [
+            "    return __getattr__",
+            "__getattr__ = wrapper(_cls)",
+        ]
+    )
+
+    unique_filename = _generate_unique_filename(cls, "getattr")
+
+    glob = {
+        "cached_properties": cached_properties,
+        "_cached_setattr_get": _OBJ_SETATTR.__get__,
+        "original_getattr": original_getattr,
+    }
+
+    return _linecache_and_compile(
+        "\n".join(lines), unique_filename, glob, locals={"_cls": cls}
+    )["__getattr__"]
+
+
+def _frozen_setattrs(self, name, value):
+    """
+    Attached to frozen classes as __setattr__.
+    """
+    if isinstance(self, BaseException) and name in (
+        "__cause__",
+        "__context__",
+        "__traceback__",
+        "__suppress_context__",
+        "__notes__",
+    ):
+        BaseException.__setattr__(self, name, value)
+        return
+
+    raise FrozenInstanceError
+
+
+def _frozen_delattrs(self, name):
+    """
+    Attached to frozen classes as __delattr__.
+    """
+    if isinstance(self, BaseException) and name in ("__notes__",):
+        BaseException.__delattr__(self, name)
+        return
+
+    raise FrozenInstanceError
+
+
+def evolve(*args, **changes):
+    """
+    Create a new instance, based on the first positional argument with
+    *changes* applied.
+
+    .. tip::
+
+       On Python 3.13 and later, you can also use `copy.replace` instead.
+
+    Args:
+
+        inst:
+            Instance of a class with *attrs* attributes. *inst* must be passed
+            as a positional argument.
+
+        changes:
+            Keyword changes in the new copy.
+
+    Returns:
+        A copy of inst with *changes* incorporated.
+
+    Raises:
+        TypeError:
+            If *attr_name* couldn't be found in the class ``__init__``.
+
+        attrs.exceptions.NotAnAttrsClassError:
+            If *cls* is not an *attrs* class.
+
+    .. versionadded:: 17.1.0
+    .. deprecated:: 23.1.0
+       It is now deprecated to pass the instance using the keyword argument
+       *inst*. It will raise a warning until at least April 2024, after which
+       it will become an error. Always pass the instance as a positional
+       argument.
+    .. versionchanged:: 24.1.0
+       *inst* can't be passed as a keyword argument anymore.
+    """
+    try:
+        (inst,) = args
+    except ValueError:
+        msg = (
+            f"evolve() takes 1 positional argument, but {len(args)} were given"
+        )
+        raise TypeError(msg) from None
+
+    cls = inst.__class__
+    attrs = fields(cls)
+    for a in attrs:
+        if not a.init:
+            continue
+        attr_name = a.name  # To deal with private attributes.
+        init_name = a.alias
+        if init_name not in changes:
+            changes[init_name] = getattr(inst, attr_name)
+
+    return cls(**changes)
+
+
+class _ClassBuilder:
+    """
+    Iteratively build *one* class.
+    """
+
+    __slots__ = (
+        "_add_method_dunders",
+        "_attr_names",
+        "_attrs",
+        "_base_attr_map",
+        "_base_names",
+        "_cache_hash",
+        "_cls",
+        "_cls_dict",
+        "_delete_attribs",
+        "_frozen",
+        "_has_custom_setattr",
+        "_has_post_init",
+        "_has_pre_init",
+        "_is_exc",
+        "_on_setattr",
+        "_pre_init_has_args",
+        "_repr_added",
+        "_script_snippets",
+        "_slots",
+        "_weakref_slot",
+        "_wrote_own_setattr",
+    )
+
+    def __init__(
+        self,
+        cls: type,
+        these,
+        slots,
+        frozen,
+        weakref_slot,
+        getstate_setstate,
+        auto_attribs,
+        kw_only,
+        cache_hash,
+        is_exc,
+        collect_by_mro,
+        on_setattr,
+        has_custom_setattr,
+        field_transformer,
+    ):
+        attrs, base_attrs, base_map = _transform_attrs(
+            cls,
+            these,
+            auto_attribs,
+            kw_only,
+            collect_by_mro,
+            field_transformer,
+        )
+
+        self._cls = cls
+        self._cls_dict = dict(cls.__dict__) if slots else {}
+        self._attrs = attrs
+        self._base_names = {a.name for a in base_attrs}
+        self._base_attr_map = base_map
+        self._attr_names = tuple(a.name for a in attrs)
+        self._slots = slots
+        self._frozen = frozen
+        self._weakref_slot = weakref_slot
+        self._cache_hash = cache_hash
+        self._has_pre_init = bool(getattr(cls, "__attrs_pre_init__", False))
+        self._pre_init_has_args = False
+        if self._has_pre_init:
+            # Check if the pre init method has more arguments than just `self`
+            # We want to pass arguments if pre init expects arguments
+            pre_init_func = cls.__attrs_pre_init__
+            pre_init_signature = inspect.signature(pre_init_func)
+            self._pre_init_has_args = len(pre_init_signature.parameters) > 1
+        self._has_post_init = bool(getattr(cls, "__attrs_post_init__", False))
+        self._delete_attribs = not bool(these)
+        self._is_exc = is_exc
+        self._on_setattr = on_setattr
+
+        self._has_custom_setattr = has_custom_setattr
+        self._wrote_own_setattr = False
+
+        self._cls_dict["__attrs_attrs__"] = self._attrs
+
+        if frozen:
+            self._cls_dict["__setattr__"] = _frozen_setattrs
+            self._cls_dict["__delattr__"] = _frozen_delattrs
+
+            self._wrote_own_setattr = True
+        elif on_setattr in (
+            _DEFAULT_ON_SETATTR,
+            setters.validate,
+            setters.convert,
+        ):
+            has_validator = has_converter = False
+            for a in attrs:
+                if a.validator is not None:
+                    has_validator = True
+                if a.converter is not None:
+                    has_converter = True
+
+                if has_validator and has_converter:
+                    break
+            if (
+                (
+                    on_setattr == _DEFAULT_ON_SETATTR
+                    and not (has_validator or has_converter)
+                )
+                or (on_setattr == setters.validate and not has_validator)
+                or (on_setattr == setters.convert and not has_converter)
+            ):
+                # If class-level on_setattr is set to convert + validate, but
+                # there's no field to convert or validate, pretend like there's
+                # no on_setattr.
+                self._on_setattr = None
+
+        if getstate_setstate:
+            (
+                self._cls_dict["__getstate__"],
+                self._cls_dict["__setstate__"],
+            ) = self._make_getstate_setstate()
+
+        # tuples of script, globs, hook
+        self._script_snippets: list[
+            tuple[str, dict, Callable[[dict, dict], Any]]
+        ] = []
+        self._repr_added = False
+
+        # We want to only do this check once; in 99.9% of cases these
+        # exist.
+        if not hasattr(self._cls, "__module__") or not hasattr(
+            self._cls, "__qualname__"
+        ):
+            self._add_method_dunders = self._add_method_dunders_safe
+        else:
+            self._add_method_dunders = self._add_method_dunders_unsafe
+
+    def __repr__(self):
+        return f"<_ClassBuilder(cls={self._cls.__name__})>"
+
+    def _eval_snippets(self) -> None:
+        """
+        Evaluate any registered snippets in one go.
+        """
+        script = "\n".join([snippet[0] for snippet in self._script_snippets])
+        globs = {}
+        for _, snippet_globs, _ in self._script_snippets:
+            globs.update(snippet_globs)
+
+        locs = _linecache_and_compile(
+            script,
+            _generate_unique_filename(self._cls, "methods"),
+            globs,
+        )
+
+        for _, _, hook in self._script_snippets:
+            hook(self._cls_dict, locs)
+
+    def build_class(self):
+        """
+        Finalize class based on the accumulated configuration.
+
+        Builder cannot be used after calling this method.
+        """
+        self._eval_snippets()
+        if self._slots is True:
+            cls = self._create_slots_class()
+        else:
+            cls = self._patch_original_class()
+            if PY_3_10_PLUS:
+                cls = abc.update_abstractmethods(cls)
+
+        # The method gets only called if it's not inherited from a base class.
+        # _has_own_attribute does NOT work properly for classmethods.
+        if (
+            getattr(cls, "__attrs_init_subclass__", None)
+            and "__attrs_init_subclass__" not in cls.__dict__
+        ):
+            cls.__attrs_init_subclass__()
+
+        return cls
+
+    def _patch_original_class(self):
+        """
+        Apply accumulated methods and return the class.
+        """
+        cls = self._cls
+        base_names = self._base_names
+
+        # Clean class of attribute definitions (`attr.ib()`s).
+        if self._delete_attribs:
+            for name in self._attr_names:
+                if (
+                    name not in base_names
+                    and getattr(cls, name, _SENTINEL) is not _SENTINEL
+                ):
+                    # An AttributeError can happen if a base class defines a
+                    # class variable and we want to set an attribute with the
+                    # same name by using only a type annotation.
+                    with contextlib.suppress(AttributeError):
+                        delattr(cls, name)
+
+        # Attach our dunder methods.
+        for name, value in self._cls_dict.items():
+            setattr(cls, name, value)
+
+        # If we've inherited an attrs __setattr__ and don't write our own,
+        # reset it to object's.
+        if not self._wrote_own_setattr and getattr(
+            cls, "__attrs_own_setattr__", False
+        ):
+            cls.__attrs_own_setattr__ = False
+
+            if not self._has_custom_setattr:
+                cls.__setattr__ = _OBJ_SETATTR
+
+        return cls
+
+    def _create_slots_class(self):
+        """
+        Build and return a new class with a `__slots__` attribute.
+        """
+        cd = {
+            k: v
+            for k, v in self._cls_dict.items()
+            if k not in (*tuple(self._attr_names), "__dict__", "__weakref__")
+        }
+
+        # If our class doesn't have its own implementation of __setattr__
+        # (either from the user or by us), check the bases, if one of them has
+        # an attrs-made __setattr__, that needs to be reset. We don't walk the
+        # MRO because we only care about our immediate base classes.
+        # XXX: This can be confused by subclassing a slotted attrs class with
+        # XXX: a non-attrs class and subclass the resulting class with an attrs
+        # XXX: class.  See `test_slotted_confused` for details.  For now that's
+        # XXX: OK with us.
+        if not self._wrote_own_setattr:
+            cd["__attrs_own_setattr__"] = False
+
+            if not self._has_custom_setattr:
+                for base_cls in self._cls.__bases__:
+                    if base_cls.__dict__.get("__attrs_own_setattr__", False):
+                        cd["__setattr__"] = _OBJ_SETATTR
+                        break
+
+        # Traverse the MRO to collect existing slots
+        # and check for an existing __weakref__.
+        existing_slots = {}
+        weakref_inherited = False
+        for base_cls in self._cls.__mro__[1:-1]:
+            if base_cls.__dict__.get("__weakref__", None) is not None:
+                weakref_inherited = True
+            existing_slots.update(
+                {
+                    name: getattr(base_cls, name)
+                    for name in getattr(base_cls, "__slots__", [])
+                }
+            )
+
+        base_names = set(self._base_names)
+
+        names = self._attr_names
+        if (
+            self._weakref_slot
+            and "__weakref__" not in getattr(self._cls, "__slots__", ())
+            and "__weakref__" not in names
+            and not weakref_inherited
+        ):
+            names += ("__weakref__",)
+
+        cached_properties = {
+            name: cached_prop.func
+            for name, cached_prop in cd.items()
+            if isinstance(cached_prop, cached_property)
+        }
+
+        # Collect methods with a `__class__` reference that are shadowed in the new class.
+        # To know to update them.
+        additional_closure_functions_to_update = []
+        if cached_properties:
+            class_annotations = _get_annotations(self._cls)
+            for name, func in cached_properties.items():
+                # Add cached properties to names for slotting.
+                names += (name,)
+                # Clear out function from class to avoid clashing.
+                del cd[name]
+                additional_closure_functions_to_update.append(func)
+                annotation = inspect.signature(func).return_annotation
+                if annotation is not inspect.Parameter.empty:
+                    class_annotations[name] = annotation
+
+            original_getattr = cd.get("__getattr__")
+            if original_getattr is not None:
+                additional_closure_functions_to_update.append(original_getattr)
+
+            cd["__getattr__"] = _make_cached_property_getattr(
+                cached_properties, original_getattr, self._cls
+            )
+
+        # We only add the names of attributes that aren't inherited.
+        # Setting __slots__ to inherited attributes wastes memory.
+        slot_names = [name for name in names if name not in base_names]
+
+        # There are slots for attributes from current class
+        # that are defined in parent classes.
+        # As their descriptors may be overridden by a child class,
+        # we collect them here and update the class dict
+        reused_slots = {
+            slot: slot_descriptor
+            for slot, slot_descriptor in existing_slots.items()
+            if slot in slot_names
+        }
+        slot_names = [name for name in slot_names if name not in reused_slots]
+        cd.update(reused_slots)
+        if self._cache_hash:
+            slot_names.append(_HASH_CACHE_FIELD)
+
+        cd["__slots__"] = tuple(slot_names)
+
+        cd["__qualname__"] = self._cls.__qualname__
+
+        # Create new class based on old class and our methods.
+        cls = type(self._cls)(self._cls.__name__, self._cls.__bases__, cd)
+
+        # The following is a fix for
+        # <https://github.com/python-attrs/attrs/issues/102>.
+        # If a method mentions `__class__` or uses the no-arg super(), the
+        # compiler will bake a reference to the class in the method itself
+        # as `method.__closure__`.  Since we replace the class with a
+        # clone, we rewrite these references so it keeps working.
+        for item in itertools.chain(
+            cls.__dict__.values(), additional_closure_functions_to_update
+        ):
+            if isinstance(item, (classmethod, staticmethod)):
+                # Class- and staticmethods hide their functions inside.
+                # These might need to be rewritten as well.
+                closure_cells = getattr(item.__func__, "__closure__", None)
+            elif isinstance(item, property):
+                # Workaround for property `super()` shortcut (PY3-only).
+                # There is no universal way for other descriptors.
+                closure_cells = getattr(item.fget, "__closure__", None)
+            else:
+                closure_cells = getattr(item, "__closure__", None)
+
+            if not closure_cells:  # Catch None or the empty list.
+                continue
+            for cell in closure_cells:
+                try:
+                    match = cell.cell_contents is self._cls
+                except ValueError:  # noqa: PERF203
+                    # ValueError: Cell is empty
+                    pass
+                else:
+                    if match:
+                        cell.cell_contents = cls
+        return cls
+
+    def add_repr(self, ns):
+        script, globs = _make_repr_script(self._attrs, ns)
+
+        def _attach_repr(cls_dict, globs):
+            cls_dict["__repr__"] = self._add_method_dunders(globs["__repr__"])
+
+        self._script_snippets.append((script, globs, _attach_repr))
+        self._repr_added = True
+        return self
+
+    def add_str(self):
+        if not self._repr_added:
+            msg = "__str__ can only be generated if a __repr__ exists."
+            raise ValueError(msg)
+
+        def __str__(self):
+            return self.__repr__()
+
+        self._cls_dict["__str__"] = self._add_method_dunders(__str__)
+        return self
+
+    def _make_getstate_setstate(self):
+        """
+        Create custom __setstate__ and __getstate__ methods.
+        """
+        # __weakref__ is not writable.
+        state_attr_names = tuple(
+            an for an in self._attr_names if an != "__weakref__"
+        )
+
+        def slots_getstate(self):
+            """
+            Automatically created by attrs.
+            """
+            return {name: getattr(self, name) for name in state_attr_names}
+
+        hash_caching_enabled = self._cache_hash
+
+        def slots_setstate(self, state):
+            """
+            Automatically created by attrs.
+            """
+            __bound_setattr = _OBJ_SETATTR.__get__(self)
+            if isinstance(state, tuple):
+                # Backward compatibility with attrs instances pickled with
+                # attrs versions before v22.2.0 which stored tuples.
+                for name, value in zip(state_attr_names, state):
+                    __bound_setattr(name, value)
+            else:
+                for name in state_attr_names:
+                    if name in state:
+                        __bound_setattr(name, state[name])
+
+            # The hash code cache is not included when the object is
+            # serialized, but it still needs to be initialized to None to
+            # indicate that the first call to __hash__ should be a cache
+            # miss.
+            if hash_caching_enabled:
+                __bound_setattr(_HASH_CACHE_FIELD, None)
+
+        return slots_getstate, slots_setstate
+
+    def make_unhashable(self):
+        self._cls_dict["__hash__"] = None
+        return self
+
+    def add_hash(self):
+        script, globs = _make_hash_script(
+            self._cls,
+            self._attrs,
+            frozen=self._frozen,
+            cache_hash=self._cache_hash,
+        )
+
+        def attach_hash(cls_dict: dict, locs: dict) -> None:
+            cls_dict["__hash__"] = self._add_method_dunders(locs["__hash__"])
+
+        self._script_snippets.append((script, globs, attach_hash))
+
+        return self
+
+    def add_init(self):
+        script, globs, annotations = _make_init_script(
+            self._cls,
+            self._attrs,
+            self._has_pre_init,
+            self._pre_init_has_args,
+            self._has_post_init,
+            self._frozen,
+            self._slots,
+            self._cache_hash,
+            self._base_attr_map,
+            self._is_exc,
+            self._on_setattr,
+            attrs_init=False,
+        )
+
+        def _attach_init(cls_dict, globs):
+            init = globs["__init__"]
+            init.__annotations__ = annotations
+            cls_dict["__init__"] = self._add_method_dunders(init)
+
+        self._script_snippets.append((script, globs, _attach_init))
+
+        return self
+
+    def add_replace(self):
+        self._cls_dict["__replace__"] = self._add_method_dunders(
+            lambda self, **changes: evolve(self, **changes)
+        )
+        return self
+
+    def add_match_args(self):
+        self._cls_dict["__match_args__"] = tuple(
+            field.name
+            for field in self._attrs
+            if field.init and not field.kw_only
+        )
+
+    def add_attrs_init(self):
+        script, globs, annotations = _make_init_script(
+            self._cls,
+            self._attrs,
+            self._has_pre_init,
+            self._pre_init_has_args,
+            self._has_post_init,
+            self._frozen,
+            self._slots,
+            self._cache_hash,
+            self._base_attr_map,
+            self._is_exc,
+            self._on_setattr,
+            attrs_init=True,
+        )
+
+        def _attach_attrs_init(cls_dict, globs):
+            init = globs["__attrs_init__"]
+            init.__annotations__ = annotations
+            cls_dict["__attrs_init__"] = self._add_method_dunders(init)
+
+        self._script_snippets.append((script, globs, _attach_attrs_init))
+
+        return self
+
+    def add_eq(self):
+        cd = self._cls_dict
+
+        script, globs = _make_eq_script(self._attrs)
+
+        def _attach_eq(cls_dict, globs):
+            cls_dict["__eq__"] = self._add_method_dunders(globs["__eq__"])
+
+        self._script_snippets.append((script, globs, _attach_eq))
+
+        cd["__ne__"] = __ne__
+
+        return self
+
+    def add_order(self):
+        cd = self._cls_dict
+
+        cd["__lt__"], cd["__le__"], cd["__gt__"], cd["__ge__"] = (
+            self._add_method_dunders(meth)
+            for meth in _make_order(self._cls, self._attrs)
+        )
+
+        return self
+
+    def add_setattr(self):
+        sa_attrs = {}
+        for a in self._attrs:
+            on_setattr = a.on_setattr or self._on_setattr
+            if on_setattr and on_setattr is not setters.NO_OP:
+                sa_attrs[a.name] = a, on_setattr
+
+        if not sa_attrs:
+            return self
+
+        if self._has_custom_setattr:
+            # We need to write a __setattr__ but there already is one!
+            msg = "Can't combine custom __setattr__ with on_setattr hooks."
+            raise ValueError(msg)
+
+        # docstring comes from _add_method_dunders
+        def __setattr__(self, name, val):
+            try:
+                a, hook = sa_attrs[name]
+            except KeyError:
+                nval = val
+            else:
+                nval = hook(self, a, val)
+
+            _OBJ_SETATTR(self, name, nval)
+
+        self._cls_dict["__attrs_own_setattr__"] = True
+        self._cls_dict["__setattr__"] = self._add_method_dunders(__setattr__)
+        self._wrote_own_setattr = True
+
+        return self
+
+    def _add_method_dunders_unsafe(self, method: Callable) -> Callable:
+        """
+        Add __module__ and __qualname__ to a *method*.
+        """
+        method.__module__ = self._cls.__module__
+
+        method.__qualname__ = f"{self._cls.__qualname__}.{method.__name__}"
+
+        method.__doc__ = (
+            f"Method generated by attrs for class {self._cls.__qualname__}."
+        )
+
+        return method
+
+    def _add_method_dunders_safe(self, method: Callable) -> Callable:
+        """
+        Add __module__ and __qualname__ to a *method* if possible.
+        """
+        with contextlib.suppress(AttributeError):
+            method.__module__ = self._cls.__module__
+
+        with contextlib.suppress(AttributeError):
+            method.__qualname__ = f"{self._cls.__qualname__}.{method.__name__}"
+
+        with contextlib.suppress(AttributeError):
+            method.__doc__ = f"Method generated by attrs for class {self._cls.__qualname__}."
+
+        return method
+
+
+def _determine_attrs_eq_order(cmp, eq, order, default_eq):
+    """
+    Validate the combination of *cmp*, *eq*, and *order*. Derive the effective
+    values of eq and order.  If *eq* is None, set it to *default_eq*.
+    """
+    if cmp is not None and any((eq is not None, order is not None)):
+        msg = "Don't mix `cmp` with `eq' and `order`."
+        raise ValueError(msg)
+
+    # cmp takes precedence due to bw-compatibility.
+    if cmp is not None:
+        return cmp, cmp
+
+    # If left None, equality is set to the specified default and ordering
+    # mirrors equality.
+    if eq is None:
+        eq = default_eq
+
+    if order is None:
+        order = eq
+
+    if eq is False and order is True:
+        msg = "`order` can only be True if `eq` is True too."
+        raise ValueError(msg)
+
+    return eq, order
+
+
+def _determine_attrib_eq_order(cmp, eq, order, default_eq):
+    """
+    Validate the combination of *cmp*, *eq*, and *order*. Derive the effective
+    values of eq and order.  If *eq* is None, set it to *default_eq*.
+    """
+    if cmp is not None and any((eq is not None, order is not None)):
+        msg = "Don't mix `cmp` with `eq' and `order`."
+        raise ValueError(msg)
+
+    def decide_callable_or_boolean(value):
+        """
+        Decide whether a key function is used.
+        """
+        if callable(value):
+            value, key = True, value
+        else:
+            key = None
+        return value, key
+
+    # cmp takes precedence due to bw-compatibility.
+    if cmp is not None:
+        cmp, cmp_key = decide_callable_or_boolean(cmp)
+        return cmp, cmp_key, cmp, cmp_key
+
+    # If left None, equality is set to the specified default and ordering
+    # mirrors equality.
+    if eq is None:
+        eq, eq_key = default_eq, None
+    else:
+        eq, eq_key = decide_callable_or_boolean(eq)
+
+    if order is None:
+        order, order_key = eq, eq_key
+    else:
+        order, order_key = decide_callable_or_boolean(order)
+
+    if eq is False and order is True:
+        msg = "`order` can only be True if `eq` is True too."
+        raise ValueError(msg)
+
+    return eq, eq_key, order, order_key
+
+
+def _determine_whether_to_implement(
+    cls, flag, auto_detect, dunders, default=True
+):
+    """
+    Check whether we should implement a set of methods for *cls*.
+
+    *flag* is the argument passed into @attr.s like 'init', *auto_detect* the
+    same as passed into @attr.s and *dunders* is a tuple of attribute names
+    whose presence signal that the user has implemented it themselves.
+
+    Return *default* if no reason for either for or against is found.
+    """
+    if flag is True or flag is False:
+        return flag
+
+    if flag is None and auto_detect is False:
+        return default
+
+    # Logically, flag is None and auto_detect is True here.
+    for dunder in dunders:
+        if _has_own_attribute(cls, dunder):
+            return False
+
+    return default
+
+
+def attrs(
+    maybe_cls=None,
+    these=None,
+    repr_ns=None,
+    repr=None,
+    cmp=None,
+    hash=None,
+    init=None,
+    slots=False,
+    frozen=False,
+    weakref_slot=True,
+    str=False,
+    auto_attribs=False,
+    kw_only=False,
+    cache_hash=False,
+    auto_exc=False,
+    eq=None,
+    order=None,
+    auto_detect=False,
+    collect_by_mro=False,
+    getstate_setstate=None,
+    on_setattr=None,
+    field_transformer=None,
+    match_args=True,
+    unsafe_hash=None,
+):
+    r"""
+    A class decorator that adds :term:`dunder methods` according to the
+    specified attributes using `attr.ib` or the *these* argument.
+
+    Consider using `attrs.define` / `attrs.frozen` in new code (``attr.s`` will
+    *never* go away, though).
+
+    Args:
+        repr_ns (str):
+            When using nested classes, there was no way in Python 2 to
+            automatically detect that.  This argument allows to set a custom
+            name for a more meaningful ``repr`` output.  This argument is
+            pointless in Python 3 and is therefore deprecated.
+
+    .. caution::
+        Refer to `attrs.define` for the rest of the parameters, but note that they
+        can have different defaults.
+
+        Notably, leaving *on_setattr* as `None` will **not** add any hooks.
+
+    .. versionadded:: 16.0.0 *slots*
+    .. versionadded:: 16.1.0 *frozen*
+    .. versionadded:: 16.3.0 *str*
+    .. versionadded:: 16.3.0 Support for ``__attrs_post_init__``.
+    .. versionchanged:: 17.1.0
+       *hash* supports `None` as value which is also the default now.
+    .. versionadded:: 17.3.0 *auto_attribs*
+    .. versionchanged:: 18.1.0
+       If *these* is passed, no attributes are deleted from the class body.
+    .. versionchanged:: 18.1.0 If *these* is ordered, the order is retained.
+    .. versionadded:: 18.2.0 *weakref_slot*
+    .. deprecated:: 18.2.0
+       ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now raise a
+       `DeprecationWarning` if the classes compared are subclasses of
+       each other. ``__eq`` and ``__ne__`` never tried to compared subclasses
+       to each other.
+    .. versionchanged:: 19.2.0
+       ``__lt__``, ``__le__``, ``__gt__``, and ``__ge__`` now do not consider
+       subclasses comparable anymore.
+    .. versionadded:: 18.2.0 *kw_only*
+    .. versionadded:: 18.2.0 *cache_hash*
+    .. versionadded:: 19.1.0 *auto_exc*
+    .. deprecated:: 19.2.0 *cmp* Removal on or after 2021-06-01.
+    .. versionadded:: 19.2.0 *eq* and *order*
+    .. versionadded:: 20.1.0 *auto_detect*
+    .. versionadded:: 20.1.0 *collect_by_mro*
+    .. versionadded:: 20.1.0 *getstate_setstate*
+    .. versionadded:: 20.1.0 *on_setattr*
+    .. versionadded:: 20.3.0 *field_transformer*
+    .. versionchanged:: 21.1.0
+       ``init=False`` injects ``__attrs_init__``
+    .. versionchanged:: 21.1.0 Support for ``__attrs_pre_init__``
+    .. versionchanged:: 21.1.0 *cmp* undeprecated
+    .. versionadded:: 21.3.0 *match_args*
+    .. versionadded:: 22.2.0
+       *unsafe_hash* as an alias for *hash* (for :pep:`681` compliance).
+    .. deprecated:: 24.1.0 *repr_ns*
+    .. versionchanged:: 24.1.0
+       Instances are not compared as tuples of attributes anymore, but using a
+       big ``and`` condition. This is faster and has more correct behavior for
+       uncomparable values like `math.nan`.
+    .. versionadded:: 24.1.0
+       If a class has an *inherited* classmethod called
+       ``__attrs_init_subclass__``, it is executed after the class is created.
+    .. deprecated:: 24.1.0 *hash* is deprecated in favor of *unsafe_hash*.
+    """
+    if repr_ns is not None:
+        import warnings
+
+        warnings.warn(
+            DeprecationWarning(
+                "The `repr_ns` argument is deprecated and will be removed in or after August 2025."
+            ),
+            stacklevel=2,
+        )
+
+    eq_, order_ = _determine_attrs_eq_order(cmp, eq, order, None)
+
+    #  unsafe_hash takes precedence due to PEP 681.
+    if unsafe_hash is not None:
+        hash = unsafe_hash
+
+    if isinstance(on_setattr, (list, tuple)):
+        on_setattr = setters.pipe(*on_setattr)
+
+    def wrap(cls):
+        is_frozen = frozen or _has_frozen_base_class(cls)
+        is_exc = auto_exc is True and issubclass(cls, BaseException)
+        has_own_setattr = auto_detect and _has_own_attribute(
+            cls, "__setattr__"
+        )
+
+        if has_own_setattr and is_frozen:
+            msg = "Can't freeze a class with a custom __setattr__."
+            raise ValueError(msg)
+
+        builder = _ClassBuilder(
+            cls,
+            these,
+            slots,
+            is_frozen,
+            weakref_slot,
+            _determine_whether_to_implement(
+                cls,
+                getstate_setstate,
+                auto_detect,
+                ("__getstate__", "__setstate__"),
+                default=slots,
+            ),
+            auto_attribs,
+            kw_only,
+            cache_hash,
+            is_exc,
+            collect_by_mro,
+            on_setattr,
+            has_own_setattr,
+            field_transformer,
+        )
+
+        if _determine_whether_to_implement(
+            cls, repr, auto_detect, ("__repr__",)
+        ):
+            builder.add_repr(repr_ns)
+
+        if str is True:
+            builder.add_str()
+
+        eq = _determine_whether_to_implement(
+            cls, eq_, auto_detect, ("__eq__", "__ne__")
+        )
+        if not is_exc and eq is True:
+            builder.add_eq()
+        if not is_exc and _determine_whether_to_implement(
+            cls, order_, auto_detect, ("__lt__", "__le__", "__gt__", "__ge__")
+        ):
+            builder.add_order()
+
+        if not frozen:
+            builder.add_setattr()
+
+        nonlocal hash
+        if (
+            hash is None
+            and auto_detect is True
+            and _has_own_attribute(cls, "__hash__")
+        ):
+            hash = False
+
+        if hash is not True and hash is not False and hash is not None:
+            # Can't use `hash in` because 1 == True for example.
+            msg = "Invalid value for hash.  Must be True, False, or None."
+            raise TypeError(msg)
+
+        if hash is False or (hash is None and eq is False) or is_exc:
+            # Don't do anything. Should fall back to __object__'s __hash__
+            # which is by id.
+            if cache_hash:
+                msg = "Invalid value for cache_hash.  To use hash caching, hashing must be either explicitly or implicitly enabled."
+                raise TypeError(msg)
+        elif hash is True or (
+            hash is None and eq is True and is_frozen is True
+        ):
+            # Build a __hash__ if told so, or if it's safe.
+            builder.add_hash()
+        else:
+            # Raise TypeError on attempts to hash.
+            if cache_hash:
+                msg = "Invalid value for cache_hash.  To use hash caching, hashing must be either explicitly or implicitly enabled."
+                raise TypeError(msg)
+            builder.make_unhashable()
+
+        if _determine_whether_to_implement(
+            cls, init, auto_detect, ("__init__",)
+        ):
+            builder.add_init()
+        else:
+            builder.add_attrs_init()
+            if cache_hash:
+                msg = "Invalid value for cache_hash.  To use hash caching, init must be True."
+                raise TypeError(msg)
+
+        if PY_3_13_PLUS and not _has_own_attribute(cls, "__replace__"):
+            builder.add_replace()
+
+        if (
+            PY_3_10_PLUS
+            and match_args
+            and not _has_own_attribute(cls, "__match_args__")
+        ):
+            builder.add_match_args()
+
+        return builder.build_class()
+
+    # maybe_cls's type depends on the usage of the decorator.  It's a class
+    # if it's used as `@attrs` but `None` if used as `@attrs()`.
+    if maybe_cls is None:
+        return wrap
+
+    return wrap(maybe_cls)
+
+
+_attrs = attrs
+"""
+Internal alias so we can use it in functions that take an argument called
+*attrs*.
+"""
+
+
+def _has_frozen_base_class(cls):
+    """
+    Check whether *cls* has a frozen ancestor by looking at its
+    __setattr__.
+    """
+    return cls.__setattr__ is _frozen_setattrs
+
+
+def _generate_unique_filename(cls: type, func_name: str) -> str:
+    """
+    Create a "filename" suitable for a function being generated.
+    """
+    return (
+        f"<attrs generated {func_name} {cls.__module__}."
+        f"{getattr(cls, '__qualname__', cls.__name__)}>"
+    )
+
+
+def _make_hash_script(
+    cls: type, attrs: list[Attribute], frozen: bool, cache_hash: bool
+) -> tuple[str, dict]:
+    attrs = tuple(
+        a for a in attrs if a.hash is True or (a.hash is None and a.eq is True)
+    )
+
+    tab = "        "
+
+    type_hash = hash(_generate_unique_filename(cls, "hash"))
+    # If eq is custom generated, we need to include the functions in globs
+    globs = {}
+
+    hash_def = "def __hash__(self"
+    hash_func = "hash(("
+    closing_braces = "))"
+    if not cache_hash:
+        hash_def += "):"
+    else:
+        hash_def += ", *"
+
+        hash_def += ", _cache_wrapper=__import__('attr._make')._make._CacheHashWrapper):"
+        hash_func = "_cache_wrapper(" + hash_func
+        closing_braces += ")"
+
+    method_lines = [hash_def]
+
+    def append_hash_computation_lines(prefix, indent):
+        """
+        Generate the code for actually computing the hash code.
+        Below this will either be returned directly or used to compute
+        a value which is then cached, depending on the value of cache_hash
+        """
+
+        method_lines.extend(
+            [
+                indent + prefix + hash_func,
+                indent + f"        {type_hash},",
+            ]
+        )
+
+        for a in attrs:
+            if a.eq_key:
+                cmp_name = f"_{a.name}_key"
+                globs[cmp_name] = a.eq_key
+                method_lines.append(
+                    indent + f"        {cmp_name}(self.{a.name}),"
+                )
+            else:
+                method_lines.append(indent + f"        self.{a.name},")
+
+        method_lines.append(indent + "    " + closing_braces)
+
+    if cache_hash:
+        method_lines.append(tab + f"if self.{_HASH_CACHE_FIELD} is None:")
+        if frozen:
+            append_hash_computation_lines(
+                f"object.__setattr__(self, '{_HASH_CACHE_FIELD}', ", tab * 2
+            )
+            method_lines.append(tab * 2 + ")")  # close __setattr__
+        else:
+            append_hash_computation_lines(
+                f"self.{_HASH_CACHE_FIELD} = ", tab * 2
+            )
+        method_lines.append(tab + f"return self.{_HASH_CACHE_FIELD}")
+    else:
+        append_hash_computation_lines("return ", tab)
+
+    script = "\n".join(method_lines)
+    return script, globs
+
+
+def _add_hash(cls: type, attrs: list[Attribute]):
+    """
+    Add a hash method to *cls*.
+    """
+    script, globs = _make_hash_script(
+        cls, attrs, frozen=False, cache_hash=False
+    )
+    _compile_and_eval(
+        script, globs, filename=_generate_unique_filename(cls, "__hash__")
+    )
+    cls.__hash__ = globs["__hash__"]
+    return cls
+
+
+def __ne__(self, other):
+    """
+    Check equality and either forward a NotImplemented or
+    return the result negated.
+    """
+    result = self.__eq__(other)
+    if result is NotImplemented:
+        return NotImplemented
+
+    return not result
+
+
+def _make_eq_script(attrs: list) -> tuple[str, dict]:
+    """
+    Create __eq__ method for *cls* with *attrs*.
+    """
+    attrs = [a for a in attrs if a.eq]
+
+    lines = [
+        "def __eq__(self, other):",
+        "    if other.__class__ is not self.__class__:",
+        "        return NotImplemented",
+    ]
+
+    globs = {}
+    if attrs:
+        lines.append("    return  (")
+        for a in attrs:
+            if a.eq_key:
+                cmp_name = f"_{a.name}_key"
+                # Add the key function to the global namespace
+                # of the evaluated function.
+                globs[cmp_name] = a.eq_key
+                lines.append(
+                    f"        {cmp_name}(self.{a.name}) == {cmp_name}(other.{a.name})"
+                )
+            else:
+                lines.append(f"        self.{a.name} == other.{a.name}")
+            if a is not attrs[-1]:
+                lines[-1] = f"{lines[-1]} and"
+        lines.append("    )")
+    else:
+        lines.append("    return True")
+
+    script = "\n".join(lines)
+
+    return script, globs
+
+
+def _make_order(cls, attrs):
+    """
+    Create ordering methods for *cls* with *attrs*.
+    """
+    attrs = [a for a in attrs if a.order]
+
+    def attrs_to_tuple(obj):
+        """
+        Save us some typing.
+        """
+        return tuple(
+            key(value) if key else value
+            for value, key in (
+                (getattr(obj, a.name), a.order_key) for a in attrs
+            )
+        )
+
+    def __lt__(self, other):
+        """
+        Automatically created by attrs.
+        """
+        if other.__class__ is self.__class__:
+            return attrs_to_tuple(self) < attrs_to_tuple(other)
+
+        return NotImplemented
+
+    def __le__(self, other):
+        """
+        Automatically created by attrs.
+        """
+        if other.__class__ is self.__class__:
+            return attrs_to_tuple(self) <= attrs_to_tuple(other)
+
+        return NotImplemented
+
+    def __gt__(self, other):
+        """
+        Automatically created by attrs.
+        """
+        if other.__class__ is self.__class__:
+            return attrs_to_tuple(self) > attrs_to_tuple(other)
+
+        return NotImplemented
+
+    def __ge__(self, other):
+        """
+        Automatically created by attrs.
+        """
+        if other.__class__ is self.__class__:
+            return attrs_to_tuple(self) >= attrs_to_tuple(other)
+
+        return NotImplemented
+
+    return __lt__, __le__, __gt__, __ge__
+
+
+def _add_eq(cls, attrs=None):
+    """
+    Add equality methods to *cls* with *attrs*.
+    """
+    if attrs is None:
+        attrs = cls.__attrs_attrs__
+
+    script, globs = _make_eq_script(attrs)
+    _compile_and_eval(
+        script, globs, filename=_generate_unique_filename(cls, "__eq__")
+    )
+    cls.__eq__ = globs["__eq__"]
+    cls.__ne__ = __ne__
+
+    return cls
+
+
+def _make_repr_script(attrs, ns) -> tuple[str, dict]:
+    """
+    Create the source and globs for a __repr__ and return it.
+    """
+    # Figure out which attributes to include, and which function to use to
+    # format them. The a.repr value can be either bool or a custom
+    # callable.
+    attr_names_with_reprs = tuple(
+        (a.name, (repr if a.repr is True else a.repr), a.init)
+        for a in attrs
+        if a.repr is not False
+    )
+    globs = {
+        name + "_repr": r for name, r, _ in attr_names_with_reprs if r != repr
+    }
+    globs["_compat"] = _compat
+    globs["AttributeError"] = AttributeError
+    globs["NOTHING"] = NOTHING
+    attribute_fragments = []
+    for name, r, i in attr_names_with_reprs:
+        accessor = (
+            "self." + name if i else 'getattr(self, "' + name + '", NOTHING)'
+        )
+        fragment = (
+            "%s={%s!r}" % (name, accessor)
+            if r == repr
+            else "%s={%s_repr(%s)}" % (name, name, accessor)
+        )
+        attribute_fragments.append(fragment)
+    repr_fragment = ", ".join(attribute_fragments)
+
+    if ns is None:
+        cls_name_fragment = '{self.__class__.__qualname__.rsplit(">.", 1)[-1]}'
+    else:
+        cls_name_fragment = ns + ".{self.__class__.__name__}"
+
+    lines = [
+        "def __repr__(self):",
+        "  try:",
+        "    already_repring = _compat.repr_context.already_repring",
+        "  except AttributeError:",
+        "    already_repring = {id(self),}",
+        "    _compat.repr_context.already_repring = already_repring",
+        "  else:",
+        "    if id(self) in already_repring:",
+        "      return '...'",
+        "    else:",
+        "      already_repring.add(id(self))",
+        "  try:",
+        f"    return f'{cls_name_fragment}({repr_fragment})'",
+        "  finally:",
+        "    already_repring.remove(id(self))",
+    ]
+
+    return "\n".join(lines), globs
+
+
+def _add_repr(cls, ns=None, attrs=None):
+    """
+    Add a repr method to *cls*.
+    """
+    if attrs is None:
+        attrs = cls.__attrs_attrs__
+
+    script, globs = _make_repr_script(attrs, ns)
+    _compile_and_eval(
+        script, globs, filename=_generate_unique_filename(cls, "__repr__")
+    )
+    cls.__repr__ = globs["__repr__"]
+    return cls
+
+
+def fields(cls):
+    """
+    Return the tuple of *attrs* attributes for a class.
+
+    The tuple also allows accessing the fields by their names (see below for
+    examples).
+
+    Args:
+        cls (type): Class to introspect.
+
+    Raises:
+        TypeError: If *cls* is not a class.
+
+        attrs.exceptions.NotAnAttrsClassError:
+            If *cls* is not an *attrs* class.
+
+    Returns:
+        tuple (with name accessors) of `attrs.Attribute`
+
+    .. versionchanged:: 16.2.0 Returned tuple allows accessing the fields
+       by name.
+    .. versionchanged:: 23.1.0 Add support for generic classes.
+    """
+    generic_base = get_generic_base(cls)
+
+    if generic_base is None and not isinstance(cls, type):
+        msg = "Passed object must be a class."
+        raise TypeError(msg)
+
+    attrs = getattr(cls, "__attrs_attrs__", None)
+
+    if attrs is None:
+        if generic_base is not None:
+            attrs = getattr(generic_base, "__attrs_attrs__", None)
+            if attrs is not None:
+                # Even though this is global state, stick it on here to speed
+                # it up. We rely on `cls` being cached for this to be
+                # efficient.
+                cls.__attrs_attrs__ = attrs
+                return attrs
+        msg = f"{cls!r} is not an attrs-decorated class."
+        raise NotAnAttrsClassError(msg)
+
+    return attrs
+
+
+def fields_dict(cls):
+    """
+    Return an ordered dictionary of *attrs* attributes for a class, whose keys
+    are the attribute names.
+
+    Args:
+        cls (type): Class to introspect.
+
+    Raises:
+        TypeError: If *cls* is not a class.
+
+        attrs.exceptions.NotAnAttrsClassError:
+            If *cls* is not an *attrs* class.
+
+    Returns:
+        dict[str, attrs.Attribute]: Dict of attribute name to definition
+
+    .. versionadded:: 18.1.0
+    """
+    if not isinstance(cls, type):
+        msg = "Passed object must be a class."
+        raise TypeError(msg)
+    attrs = getattr(cls, "__attrs_attrs__", None)
+    if attrs is None:
+        msg = f"{cls!r} is not an attrs-decorated class."
+        raise NotAnAttrsClassError(msg)
+    return {a.name: a for a in attrs}
+
+
+def validate(inst):
+    """
+    Validate all attributes on *inst* that have a validator.
+
+    Leaves all exceptions through.
+
+    Args:
+        inst: Instance of a class with *attrs* attributes.
+    """
+    if _config._run_validators is False:
+        return
+
+    for a in fields(inst.__class__):
+        v = a.validator
+        if v is not None:
+            v(inst, a, getattr(inst, a.name))
+
+
+def _is_slot_attr(a_name, base_attr_map):
+    """
+    Check if the attribute name comes from a slot class.
+    """
+    cls = base_attr_map.get(a_name)
+    return cls and "__slots__" in cls.__dict__
+
+
+def _make_init_script(
+    cls,
+    attrs,
+    pre_init,
+    pre_init_has_args,
+    post_init,
+    frozen,
+    slots,
+    cache_hash,
+    base_attr_map,
+    is_exc,
+    cls_on_setattr,
+    attrs_init,
+) -> tuple[str, dict, dict]:
+    has_cls_on_setattr = (
+        cls_on_setattr is not None and cls_on_setattr is not setters.NO_OP
+    )
+
+    if frozen and has_cls_on_setattr:
+        msg = "Frozen classes can't use on_setattr."
+        raise ValueError(msg)
+
+    needs_cached_setattr = cache_hash or frozen
+    filtered_attrs = []
+    attr_dict = {}
+    for a in attrs:
+        if not a.init and a.default is NOTHING:
+            continue
+
+        filtered_attrs.append(a)
+        attr_dict[a.name] = a
+
+        if a.on_setattr is not None:
+            if frozen is True:
+                msg = "Frozen classes can't use on_setattr."
+                raise ValueError(msg)
+
+            needs_cached_setattr = True
+        elif has_cls_on_setattr and a.on_setattr is not setters.NO_OP:
+            needs_cached_setattr = True
+
+    script, globs, annotations = _attrs_to_init_script(
+        filtered_attrs,
+        frozen,
+        slots,
+        pre_init,
+        pre_init_has_args,
+        post_init,
+        cache_hash,
+        base_attr_map,
+        is_exc,
+        needs_cached_setattr,
+        has_cls_on_setattr,
+        "__attrs_init__" if attrs_init else "__init__",
+    )
+    if cls.__module__ in sys.modules:
+        # This makes typing.get_type_hints(CLS.__init__) resolve string types.
+        globs.update(sys.modules[cls.__module__].__dict__)
+
+    globs.update({"NOTHING": NOTHING, "attr_dict": attr_dict})
+
+    if needs_cached_setattr:
+        # Save the lookup overhead in __init__ if we need to circumvent
+        # setattr hooks.
+        globs["_cached_setattr_get"] = _OBJ_SETATTR.__get__
+
+    return script, globs, annotations
+
+
+def _setattr(attr_name: str, value_var: str, has_on_setattr: bool) -> str:
+    """
+    Use the cached object.setattr to set *attr_name* to *value_var*.
+    """
+    return f"_setattr('{attr_name}', {value_var})"
+
+
+def _setattr_with_converter(
+    attr_name: str, value_var: str, has_on_setattr: bool, converter: Converter
+) -> str:
+    """
+    Use the cached object.setattr to set *attr_name* to *value_var*, but run
+    its converter first.
+    """
+    return f"_setattr('{attr_name}', {converter._fmt_converter_call(attr_name, value_var)})"
+
+
+def _assign(attr_name: str, value: str, has_on_setattr: bool) -> str:
+    """
+    Unless *attr_name* has an on_setattr hook, use normal assignment. Otherwise
+    relegate to _setattr.
+    """
+    if has_on_setattr:
+        return _setattr(attr_name, value, True)
+
+    return f"self.{attr_name} = {value}"
+
+
+def _assign_with_converter(
+    attr_name: str, value_var: str, has_on_setattr: bool, converter: Converter
+) -> str:
+    """
+    Unless *attr_name* has an on_setattr hook, use normal assignment after
+    conversion. Otherwise relegate to _setattr_with_converter.
+    """
+    if has_on_setattr:
+        return _setattr_with_converter(attr_name, value_var, True, converter)
+
+    return f"self.{attr_name} = {converter._fmt_converter_call(attr_name, value_var)}"
+
+
+def _determine_setters(
+    frozen: bool, slots: bool, base_attr_map: dict[str, type]
+):
+    """
+    Determine the correct setter functions based on whether a class is frozen
+    and/or slotted.
+    """
+    if frozen is True:
+        if slots is True:
+            return (), _setattr, _setattr_with_converter
+
+        # Dict frozen classes assign directly to __dict__.
+        # But only if the attribute doesn't come from an ancestor slot
+        # class.
+        # Note _inst_dict will be used again below if cache_hash is True
+
+        def fmt_setter(
+            attr_name: str, value_var: str, has_on_setattr: bool
+        ) -> str:
+            if _is_slot_attr(attr_name, base_attr_map):
+                return _setattr(attr_name, value_var, has_on_setattr)
+
+            return f"_inst_dict['{attr_name}'] = {value_var}"
+
+        def fmt_setter_with_converter(
+            attr_name: str,
+            value_var: str,
+            has_on_setattr: bool,
+            converter: Converter,
+        ) -> str:
+            if has_on_setattr or _is_slot_attr(attr_name, base_attr_map):
+                return _setattr_with_converter(
+                    attr_name, value_var, has_on_setattr, converter
+                )
+
+            return f"_inst_dict['{attr_name}'] = {converter._fmt_converter_call(attr_name, value_var)}"
+
+        return (
+            ("_inst_dict = self.__dict__",),
+            fmt_setter,
+            fmt_setter_with_converter,
+        )
+
+    # Not frozen -- we can just assign directly.
+    return (), _assign, _assign_with_converter
+
+
+def _attrs_to_init_script(
+    attrs: list[Attribute],
+    is_frozen: bool,
+    is_slotted: bool,
+    call_pre_init: bool,
+    pre_init_has_args: bool,
+    call_post_init: bool,
+    does_cache_hash: bool,
+    base_attr_map: dict[str, type],
+    is_exc: bool,
+    needs_cached_setattr: bool,
+    has_cls_on_setattr: bool,
+    method_name: str,
+) -> tuple[str, dict, dict]:
+    """
+    Return a script of an initializer for *attrs*, a dict of globals, and
+    annotations for the initializer.
+
+    The globals are required by the generated script.
+    """
+    lines = ["self.__attrs_pre_init__()"] if call_pre_init else []
+
+    if needs_cached_setattr:
+        lines.append(
+            # Circumvent the __setattr__ descriptor to save one lookup per
+            # assignment. Note _setattr will be used again below if
+            # does_cache_hash is True.
+            "_setattr = _cached_setattr_get(self)"
+        )
+
+    extra_lines, fmt_setter, fmt_setter_with_converter = _determine_setters(
+        is_frozen, is_slotted, base_attr_map
+    )
+    lines.extend(extra_lines)
+
+    args = []
+    kw_only_args = []
+    attrs_to_validate = []
+
+    # This is a dictionary of names to validator and converter callables.
+    # Injecting this into __init__ globals lets us avoid lookups.
+    names_for_globals = {}
+    annotations = {"return": None}
+
+    for a in attrs:
+        if a.validator:
+            attrs_to_validate.append(a)
+
+        attr_name = a.name
+        has_on_setattr = a.on_setattr is not None or (
+            a.on_setattr is not setters.NO_OP and has_cls_on_setattr
+        )
+        # a.alias is set to maybe-mangled attr_name in _ClassBuilder if not
+        # explicitly provided
+        arg_name = a.alias
+
+        has_factory = isinstance(a.default, Factory)
+        maybe_self = "self" if has_factory and a.default.takes_self else ""
+
+        if a.converter is not None and not isinstance(a.converter, Converter):
+            converter = Converter(a.converter)
+        else:
+            converter = a.converter
+
+        if a.init is False:
+            if has_factory:
+                init_factory_name = _INIT_FACTORY_PAT % (a.name,)
+                if converter is not None:
+                    lines.append(
+                        fmt_setter_with_converter(
+                            attr_name,
+                            init_factory_name + f"({maybe_self})",
+                            has_on_setattr,
+                            converter,
+                        )
+                    )
+                    names_for_globals[converter._get_global_name(a.name)] = (
+                        converter.converter
+                    )
+                else:
+                    lines.append(
+                        fmt_setter(
+                            attr_name,
+                            init_factory_name + f"({maybe_self})",
+                            has_on_setattr,
+                        )
+                    )
+                names_for_globals[init_factory_name] = a.default.factory
+            elif converter is not None:
+                lines.append(
+                    fmt_setter_with_converter(
+                        attr_name,
+                        f"attr_dict['{attr_name}'].default",
+                        has_on_setattr,
+                        converter,
+                    )
+                )
+                names_for_globals[converter._get_global_name(a.name)] = (
+                    converter.converter
+                )
+            else:
+                lines.append(
+                    fmt_setter(
+                        attr_name,
+                        f"attr_dict['{attr_name}'].default",
+                        has_on_setattr,
+                    )
+                )
+        elif a.default is not NOTHING and not has_factory:
+            arg = f"{arg_name}=attr_dict['{attr_name}'].default"
+            if a.kw_only:
+                kw_only_args.append(arg)
+            else:
+                args.append(arg)
+
+            if converter is not None:
+                lines.append(
+                    fmt_setter_with_converter(
+                        attr_name, arg_name, has_on_setattr, converter
+                    )
+                )
+                names_for_globals[converter._get_global_name(a.name)] = (
+                    converter.converter
+                )
+            else:
+                lines.append(fmt_setter(attr_name, arg_name, has_on_setattr))
+
+        elif has_factory:
+            arg = f"{arg_name}=NOTHING"
+            if a.kw_only:
+                kw_only_args.append(arg)
+            else:
+                args.append(arg)
+            lines.append(f"if {arg_name} is not NOTHING:")
+
+            init_factory_name = _INIT_FACTORY_PAT % (a.name,)
+            if converter is not None:
+                lines.append(
+                    "    "
+                    + fmt_setter_with_converter(
+                        attr_name, arg_name, has_on_setattr, converter
+                    )
+                )
+                lines.append("else:")
+                lines.append(
+                    "    "
+                    + fmt_setter_with_converter(
+                        attr_name,
+                        init_factory_name + "(" + maybe_self + ")",
+                        has_on_setattr,
+                        converter,
+                    )
+                )
+                names_for_globals[converter._get_global_name(a.name)] = (
+                    converter.converter
+                )
+            else:
+                lines.append(
+                    "    " + fmt_setter(attr_name, arg_name, has_on_setattr)
+                )
+                lines.append("else:")
+                lines.append(
+                    "    "
+                    + fmt_setter(
+                        attr_name,
+                        init_factory_name + "(" + maybe_self + ")",
+                        has_on_setattr,
+                    )
+                )
+            names_for_globals[init_factory_name] = a.default.factory
+        else:
+            if a.kw_only:
+                kw_only_args.append(arg_name)
+            else:
+                args.append(arg_name)
+
+            if converter is not None:
+                lines.append(
+                    fmt_setter_with_converter(
+                        attr_name, arg_name, has_on_setattr, converter
+                    )
+                )
+                names_for_globals[converter._get_global_name(a.name)] = (
+                    converter.converter
+                )
+            else:
+                lines.append(fmt_setter(attr_name, arg_name, has_on_setattr))
+
+        if a.init is True:
+            if a.type is not None and converter is None:
+                annotations[arg_name] = a.type
+            elif converter is not None and converter._first_param_type:
+                # Use the type from the converter if present.
+                annotations[arg_name] = converter._first_param_type
+
+    if attrs_to_validate:  # we can skip this if there are no validators.
+        names_for_globals["_config"] = _config
+        lines.append("if _config._run_validators is True:")
+        for a in attrs_to_validate:
+            val_name = "__attr_validator_" + a.name
+            attr_name = "__attr_" + a.name
+            lines.append(f"    {val_name}(self, {attr_name}, self.{a.name})")
+            names_for_globals[val_name] = a.validator
+            names_for_globals[attr_name] = a
+
+    if call_post_init:
+        lines.append("self.__attrs_post_init__()")
+
+    # Because this is set only after __attrs_post_init__ is called, a crash
+    # will result if post-init tries to access the hash code.  This seemed
+    # preferable to setting this beforehand, in which case alteration to field
+    # values during post-init combined with post-init accessing the hash code
+    # would result in silent bugs.
+    if does_cache_hash:
+        if is_frozen:
+            if is_slotted:
+                init_hash_cache = f"_setattr('{_HASH_CACHE_FIELD}', None)"
+            else:
+                init_hash_cache = f"_inst_dict['{_HASH_CACHE_FIELD}'] = None"
+        else:
+            init_hash_cache = f"self.{_HASH_CACHE_FIELD} = None"
+        lines.append(init_hash_cache)
+
+    # For exceptions we rely on BaseException.__init__ for proper
+    # initialization.
+    if is_exc:
+        vals = ",".join(f"self.{a.name}" for a in attrs if a.init)
+
+        lines.append(f"BaseException.__init__(self, {vals})")
+
+    args = ", ".join(args)
+    pre_init_args = args
+    if kw_only_args:
+        # leading comma & kw_only args
+        args += f"{', ' if args else ''}*, {', '.join(kw_only_args)}"
+        pre_init_kw_only_args = ", ".join(
+            [
+                f"{kw_arg_name}={kw_arg_name}"
+                # We need to remove the defaults from the kw_only_args.
+                for kw_arg_name in (kwa.split("=")[0] for kwa in kw_only_args)
+            ]
+        )
+        pre_init_args += ", " if pre_init_args else ""
+        pre_init_args += pre_init_kw_only_args
+
+    if call_pre_init and pre_init_has_args:
+        # If pre init method has arguments, pass same arguments as `__init__`.
+        lines[0] = f"self.__attrs_pre_init__({pre_init_args})"
+
+    # Python <3.12 doesn't allow backslashes in f-strings.
+    NL = "\n    "
+    return (
+        f"""def {method_name}(self, {args}):
+    {NL.join(lines) if lines else "pass"}
+""",
+        names_for_globals,
+        annotations,
+    )
+
+
+def _default_init_alias_for(name: str) -> str:
+    """
+    The default __init__ parameter name for a field.
+
+    This performs private-name adjustment via leading-unscore stripping,
+    and is the default value of Attribute.alias if not provided.
+    """
+
+    return name.lstrip("_")
+
+
+class Attribute:
+    """
+    *Read-only* representation of an attribute.
+
+    .. warning::
+
+       You should never instantiate this class yourself.
+
+    The class has *all* arguments of `attr.ib` (except for ``factory`` which is
+    only syntactic sugar for ``default=Factory(...)`` plus the following:
+
+    - ``name`` (`str`): The name of the attribute.
+    - ``alias`` (`str`): The __init__ parameter name of the attribute, after
+      any explicit overrides and default private-attribute-name handling.
+    - ``inherited`` (`bool`): Whether or not that attribute has been inherited
+      from a base class.
+    - ``eq_key`` and ``order_key`` (`typing.Callable` or `None`): The
+      callables that are used for comparing and ordering objects by this
+      attribute, respectively. These are set by passing a callable to
+      `attr.ib`'s ``eq``, ``order``, or ``cmp`` arguments. See also
+      :ref:`comparison customization <custom-comparison>`.
+
+    Instances of this class are frequently used for introspection purposes
+    like:
+
+    - `fields` returns a tuple of them.
+    - Validators get them passed as the first argument.
+    - The :ref:`field transformer <transform-fields>` hook receives a list of
+      them.
+    - The ``alias`` property exposes the __init__ parameter name of the field,
+      with any overrides and default private-attribute handling applied.
+
+
+    .. versionadded:: 20.1.0 *inherited*
+    .. versionadded:: 20.1.0 *on_setattr*
+    .. versionchanged:: 20.2.0 *inherited* is not taken into account for
+        equality checks and hashing anymore.
+    .. versionadded:: 21.1.0 *eq_key* and *order_key*
+    .. versionadded:: 22.2.0 *alias*
+
+    For the full version history of the fields, see `attr.ib`.
+    """
+
+    # These slots must NOT be reordered because we use them later for
+    # instantiation.
+    __slots__ = (  # noqa: RUF023
+        "name",
+        "default",
+        "validator",
+        "repr",
+        "eq",
+        "eq_key",
+        "order",
+        "order_key",
+        "hash",
+        "init",
+        "metadata",
+        "type",
+        "converter",
+        "kw_only",
+        "inherited",
+        "on_setattr",
+        "alias",
+    )
+
+    def __init__(
+        self,
+        name,
+        default,
+        validator,
+        repr,
+        cmp,  # XXX: unused, remove along with other cmp code.
+        hash,
+        init,
+        inherited,
+        metadata=None,
+        type=None,
+        converter=None,
+        kw_only=False,
+        eq=None,
+        eq_key=None,
+        order=None,
+        order_key=None,
+        on_setattr=None,
+        alias=None,
+    ):
+        eq, eq_key, order, order_key = _determine_attrib_eq_order(
+            cmp, eq_key or eq, order_key or order, True
+        )
+
+        # Cache this descriptor here to speed things up later.
+        bound_setattr = _OBJ_SETATTR.__get__(self)
+
+        # Despite the big red warning, people *do* instantiate `Attribute`
+        # themselves.
+        bound_setattr("name", name)
+        bound_setattr("default", default)
+        bound_setattr("validator", validator)
+        bound_setattr("repr", repr)
+        bound_setattr("eq", eq)
+        bound_setattr("eq_key", eq_key)
+        bound_setattr("order", order)
+        bound_setattr("order_key", order_key)
+        bound_setattr("hash", hash)
+        bound_setattr("init", init)
+        bound_setattr("converter", converter)
+        bound_setattr(
+            "metadata",
+            (
+                types.MappingProxyType(dict(metadata))  # Shallow copy
+                if metadata
+                else _EMPTY_METADATA_SINGLETON
+            ),
+        )
+        bound_setattr("type", type)
+        bound_setattr("kw_only", kw_only)
+        bound_setattr("inherited", inherited)
+        bound_setattr("on_setattr", on_setattr)
+        bound_setattr("alias", alias)
+
+    def __setattr__(self, name, value):
+        raise FrozenInstanceError
+
+    @classmethod
+    def from_counting_attr(cls, name: str, ca: _CountingAttr, type=None):
+        # type holds the annotated value. deal with conflicts:
+        if type is None:
+            type = ca.type
+        elif ca.type is not None:
+            msg = f"Type annotation and type argument cannot both be present for '{name}'."
+            raise ValueError(msg)
+        return cls(
+            name,
+            ca._default,
+            ca._validator,
+            ca.repr,
+            None,
+            ca.hash,
+            ca.init,
+            False,
+            ca.metadata,
+            type,
+            ca.converter,
+            ca.kw_only,
+            ca.eq,
+            ca.eq_key,
+            ca.order,
+            ca.order_key,
+            ca.on_setattr,
+            ca.alias,
+        )
+
+    # Don't use attrs.evolve since fields(Attribute) doesn't work
+    def evolve(self, **changes):
+        """
+        Copy *self* and apply *changes*.
+
+        This works similarly to `attrs.evolve` but that function does not work
+        with :class:`attrs.Attribute`.
+
+        It is mainly meant to be used for `transform-fields`.
+
+        .. versionadded:: 20.3.0
+        """
+        new = copy.copy(self)
+
+        new._setattrs(changes.items())
+
+        return new
+
+    # Don't use _add_pickle since fields(Attribute) doesn't work
+    def __getstate__(self):
+        """
+        Play nice with pickle.
+        """
+        return tuple(
+            getattr(self, name) if name != "metadata" else dict(self.metadata)
+            for name in self.__slots__
+        )
+
+    def __setstate__(self, state):
+        """
+        Play nice with pickle.
+        """
+        self._setattrs(zip(self.__slots__, state))
+
+    def _setattrs(self, name_values_pairs):
+        bound_setattr = _OBJ_SETATTR.__get__(self)
+        for name, value in name_values_pairs:
+            if name != "metadata":
+                bound_setattr(name, value)
+            else:
+                bound_setattr(
+                    name,
+                    (
+                        types.MappingProxyType(dict(value))
+                        if value
+                        else _EMPTY_METADATA_SINGLETON
+                    ),
+                )
+
+
+_a = [
+    Attribute(
+        name=name,
+        default=NOTHING,
+        validator=None,
+        repr=True,
+        cmp=None,
+        eq=True,
+        order=False,
+        hash=(name != "metadata"),
+        init=True,
+        inherited=False,
+        alias=_default_init_alias_for(name),
+    )
+    for name in Attribute.__slots__
+]
+
+Attribute = _add_hash(
+    _add_eq(
+        _add_repr(Attribute, attrs=_a),
+        attrs=[a for a in _a if a.name != "inherited"],
+    ),
+    attrs=[a for a in _a if a.hash and a.name != "inherited"],
+)
+
+
+class _CountingAttr:
+    """
+    Intermediate representation of attributes that uses a counter to preserve
+    the order in which the attributes have been defined.
+
+    *Internal* data structure of the attrs library.  Running into is most
+    likely the result of a bug like a forgotten `@attr.s` decorator.
+    """
+
+    __slots__ = (
+        "_default",
+        "_validator",
+        "alias",
+        "converter",
+        "counter",
+        "eq",
+        "eq_key",
+        "hash",
+        "init",
+        "kw_only",
+        "metadata",
+        "on_setattr",
+        "order",
+        "order_key",
+        "repr",
+        "type",
+    )
+    __attrs_attrs__ = (
+        *tuple(
+            Attribute(
+                name=name,
+                alias=_default_init_alias_for(name),
+                default=NOTHING,
+                validator=None,
+                repr=True,
+                cmp=None,
+                hash=True,
+                init=True,
+                kw_only=False,
+                eq=True,
+                eq_key=None,
+                order=False,
+                order_key=None,
+                inherited=False,
+                on_setattr=None,
+            )
+            for name in (
+                "counter",
+                "_default",
+                "repr",
+                "eq",
+                "order",
+                "hash",
+                "init",
+                "on_setattr",
+                "alias",
+            )
+        ),
+        Attribute(
+            name="metadata",
+            alias="metadata",
+            default=None,
+            validator=None,
+            repr=True,
+            cmp=None,
+            hash=False,
+            init=True,
+            kw_only=False,
+            eq=True,
+            eq_key=None,
+            order=False,
+            order_key=None,
+            inherited=False,
+            on_setattr=None,
+        ),
+    )
+    cls_counter = 0
+
+    def __init__(
+        self,
+        default,
+        validator,
+        repr,
+        cmp,
+        hash,
+        init,
+        converter,
+        metadata,
+        type,
+        kw_only,
+        eq,
+        eq_key,
+        order,
+        order_key,
+        on_setattr,
+        alias,
+    ):
+        _CountingAttr.cls_counter += 1
+        self.counter = _CountingAttr.cls_counter
+        self._default = default
+        self._validator = validator
+        self.converter = converter
+        self.repr = repr
+        self.eq = eq
+        self.eq_key = eq_key
+        self.order = order
+        self.order_key = order_key
+        self.hash = hash
+        self.init = init
+        self.metadata = metadata
+        self.type = type
+        self.kw_only = kw_only
+        self.on_setattr = on_setattr
+        self.alias = alias
+
+    def validator(self, meth):
+        """
+        Decorator that adds *meth* to the list of validators.
+
+        Returns *meth* unchanged.
+
+        .. versionadded:: 17.1.0
+        """
+        if self._validator is None:
+            self._validator = meth
+        else:
+            self._validator = and_(self._validator, meth)
+        return meth
+
+    def default(self, meth):
+        """
+        Decorator that allows to set the default for an attribute.
+
+        Returns *meth* unchanged.
+
+        Raises:
+            DefaultAlreadySetError: If default has been set before.
+
+        .. versionadded:: 17.1.0
+        """
+        if self._default is not NOTHING:
+            raise DefaultAlreadySetError
+
+        self._default = Factory(meth, takes_self=True)
+
+        return meth
+
+
+_CountingAttr = _add_eq(_add_repr(_CountingAttr))
+
+
+class Factory:
+    """
+    Stores a factory callable.
+
+    If passed as the default value to `attrs.field`, the factory is used to
+    generate a new value.
+
+    Args:
+        factory (typing.Callable):
+            A callable that takes either none or exactly one mandatory
+            positional argument depending on *takes_self*.
+
+        takes_self (bool):
+            Pass the partially initialized instance that is being initialized
+            as a positional argument.
+
+    .. versionadded:: 17.1.0  *takes_self*
+    """
+
+    __slots__ = ("factory", "takes_self")
+
+    def __init__(self, factory, takes_self=False):
+        self.factory = factory
+        self.takes_self = takes_self
+
+    def __getstate__(self):
+        """
+        Play nice with pickle.
+        """
+        return tuple(getattr(self, name) for name in self.__slots__)
+
+    def __setstate__(self, state):
+        """
+        Play nice with pickle.
+        """
+        for name, value in zip(self.__slots__, state):
+            setattr(self, name, value)
+
+
+_f = [
+    Attribute(
+        name=name,
+        default=NOTHING,
+        validator=None,
+        repr=True,
+        cmp=None,
+        eq=True,
+        order=False,
+        hash=True,
+        init=True,
+        inherited=False,
+    )
+    for name in Factory.__slots__
+]
+
+Factory = _add_hash(_add_eq(_add_repr(Factory, attrs=_f), attrs=_f), attrs=_f)
+
+
+class Converter:
+    """
+    Stores a converter callable.
+
+    Allows for the wrapped converter to take additional arguments. The
+    arguments are passed in the order they are documented.
+
+    Args:
+        converter (Callable): A callable that converts the passed value.
+
+        takes_self (bool):
+            Pass the partially initialized instance that is being initialized
+            as a positional argument. (default: `False`)
+
+        takes_field (bool):
+            Pass the field definition (an :class:`Attribute`) into the
+            converter as a positional argument. (default: `False`)
+
+    .. versionadded:: 24.1.0
+    """
+
+    __slots__ = (
+        "__call__",
+        "_first_param_type",
+        "_global_name",
+        "converter",
+        "takes_field",
+        "takes_self",
+    )
+
+    def __init__(self, converter, *, takes_self=False, takes_field=False):
+        self.converter = converter
+        self.takes_self = takes_self
+        self.takes_field = takes_field
+
+        ex = _AnnotationExtractor(converter)
+        self._first_param_type = ex.get_first_param_type()
+
+        if not (self.takes_self or self.takes_field):
+            self.__call__ = lambda value, _, __: self.converter(value)
+        elif self.takes_self and not self.takes_field:
+            self.__call__ = lambda value, instance, __: self.converter(
+                value, instance
+            )
+        elif not self.takes_self and self.takes_field:
+            self.__call__ = lambda value, __, field: self.converter(
+                value, field
+            )
+        else:
+            self.__call__ = lambda value, instance, field: self.converter(
+                value, instance, field
+            )
+
+        rt = ex.get_return_type()
+        if rt is not None:
+            self.__call__.__annotations__["return"] = rt
+
+    @staticmethod
+    def _get_global_name(attr_name: str) -> str:
+        """
+        Return the name that a converter for an attribute name *attr_name*
+        would have.
+        """
+        return f"__attr_converter_{attr_name}"
+
+    def _fmt_converter_call(self, attr_name: str, value_var: str) -> str:
+        """
+        Return a string that calls the converter for an attribute name
+        *attr_name* and the value in variable named *value_var* according to
+        `self.takes_self` and `self.takes_field`.
+        """
+        if not (self.takes_self or self.takes_field):
+            return f"{self._get_global_name(attr_name)}({value_var})"
+
+        if self.takes_self and self.takes_field:
+            return f"{self._get_global_name(attr_name)}({value_var}, self, attr_dict['{attr_name}'])"
+
+        if self.takes_self:
+            return f"{self._get_global_name(attr_name)}({value_var}, self)"
+
+        return f"{self._get_global_name(attr_name)}({value_var}, attr_dict['{attr_name}'])"
+
+    def __getstate__(self):
+        """
+        Return a dict containing only converter and takes_self -- the rest gets
+        computed when loading.
+        """
+        return {
+            "converter": self.converter,
+            "takes_self": self.takes_self,
+            "takes_field": self.takes_field,
+        }
+
+    def __setstate__(self, state):
+        """
+        Load instance from state.
+        """
+        self.__init__(**state)
+
+
+_f = [
+    Attribute(
+        name=name,
+        default=NOTHING,
+        validator=None,
+        repr=True,
+        cmp=None,
+        eq=True,
+        order=False,
+        hash=True,
+        init=True,
+        inherited=False,
+    )
+    for name in ("converter", "takes_self", "takes_field")
+]
+
+Converter = _add_hash(
+    _add_eq(_add_repr(Converter, attrs=_f), attrs=_f), attrs=_f
+)
+
+
+def make_class(
+    name, attrs, bases=(object,), class_body=None, **attributes_arguments
+):
+    r"""
+    A quick way to create a new class called *name* with *attrs*.
+
+    .. note::
+
+        ``make_class()`` is a thin wrapper around `attr.s`, not `attrs.define`
+        which means that it doesn't come with some of the improved defaults.
+
+        For example, if you want the same ``on_setattr`` behavior as in
+        `attrs.define`, you have to pass the hooks yourself: ``make_class(...,
+        on_setattr=setters.pipe(setters.convert, setters.validate)``
+
+    .. warning::
+
+        It is *your* duty to ensure that the class name and the attribute names
+        are valid identifiers. ``make_class()`` will *not* validate them for
+        you.
+
+    Args:
+        name (str): The name for the new class.
+
+        attrs (list | dict):
+            A list of names or a dictionary of mappings of names to `attr.ib`\
+            s / `attrs.field`\ s.
+
+            The order is deduced from the order of the names or attributes
+            inside *attrs*.  Otherwise the order of the definition of the
+            attributes is used.
+
+        bases (tuple[type, ...]): Classes that the new class will subclass.
+
+        class_body (dict):
+            An optional dictionary of class attributes for the new class.
+
+        attributes_arguments: Passed unmodified to `attr.s`.
+
+    Returns:
+        type: A new class with *attrs*.
+
+    .. versionadded:: 17.1.0 *bases*
+    .. versionchanged:: 18.1.0 If *attrs* is ordered, the order is retained.
+    .. versionchanged:: 23.2.0 *class_body*
+    .. versionchanged:: 25.2.0 Class names can now be unicode.
+    """
+    # Class identifiers are converted into the normal form NFKC while parsing
+    name = unicodedata.normalize("NFKC", name)
+
+    if isinstance(attrs, dict):
+        cls_dict = attrs
+    elif isinstance(attrs, (list, tuple)):
+        cls_dict = {a: attrib() for a in attrs}
+    else:
+        msg = "attrs argument must be a dict or a list."
+        raise TypeError(msg)
+
+    pre_init = cls_dict.pop("__attrs_pre_init__", None)
+    post_init = cls_dict.pop("__attrs_post_init__", None)
+    user_init = cls_dict.pop("__init__", None)
+
+    body = {}
+    if class_body is not None:
+        body.update(class_body)
+    if pre_init is not None:
+        body["__attrs_pre_init__"] = pre_init
+    if post_init is not None:
+        body["__attrs_post_init__"] = post_init
+    if user_init is not None:
+        body["__init__"] = user_init
+
+    type_ = types.new_class(name, bases, {}, lambda ns: ns.update(body))
+
+    # For pickling to work, the __module__ variable needs to be set to the
+    # frame where the class is created.  Bypass this step in environments where
+    # sys._getframe is not defined (Jython for example) or sys._getframe is not
+    # defined for arguments greater than 0 (IronPython).
+    with contextlib.suppress(AttributeError, ValueError):
+        type_.__module__ = sys._getframe(1).f_globals.get(
+            "__name__", "__main__"
+        )
+
+    # We do it here for proper warnings with meaningful stacklevel.
+    cmp = attributes_arguments.pop("cmp", None)
+    (
+        attributes_arguments["eq"],
+        attributes_arguments["order"],
+    ) = _determine_attrs_eq_order(
+        cmp,
+        attributes_arguments.get("eq"),
+        attributes_arguments.get("order"),
+        True,
+    )
+
+    cls = _attrs(these=cls_dict, **attributes_arguments)(type_)
+    # Only add type annotations now or "_attrs()" will complain:
+    cls.__annotations__ = {
+        k: v.type for k, v in cls_dict.items() if v.type is not None
+    }
+    return cls
+
+
+# These are required by within this module so we define them here and merely
+# import into .validators / .converters.
+
+
+@attrs(slots=True, unsafe_hash=True)
+class _AndValidator:
+    """
+    Compose many validators to a single one.
+    """
+
+    _validators = attrib()
+
+    def __call__(self, inst, attr, value):
+        for v in self._validators:
+            v(inst, attr, value)
+
+
+def and_(*validators):
+    """
+    A validator that composes multiple validators into one.
+
+    When called on a value, it runs all wrapped validators.
+
+    Args:
+        validators (~collections.abc.Iterable[typing.Callable]):
+            Arbitrary number of validators.
+
+    .. versionadded:: 17.1.0
+    """
+    vals = []
+    for validator in validators:
+        vals.extend(
+            validator._validators
+            if isinstance(validator, _AndValidator)
+            else [validator]
+        )
+
+    return _AndValidator(tuple(vals))
+
+
+def pipe(*converters):
+    """
+    A converter that composes multiple converters into one.
+
+    When called on a value, it runs all wrapped converters, returning the
+    *last* value.
+
+    Type annotations will be inferred from the wrapped converters', if they
+    have any.
+
+        converters (~collections.abc.Iterable[typing.Callable]):
+            Arbitrary number of converters.
+
+    .. versionadded:: 20.1.0
+    """
+
+    return_instance = any(isinstance(c, Converter) for c in converters)
+
+    if return_instance:
+
+        def pipe_converter(val, inst, field):
+            for c in converters:
+                val = (
+                    c(val, inst, field) if isinstance(c, Converter) else c(val)
+                )
+
+            return val
+
+    else:
+
+        def pipe_converter(val):
+            for c in converters:
+                val = c(val)
+
+            return val
+
+    if not converters:
+        # If the converter list is empty, pipe_converter is the identity.
+        A = TypeVar("A")
+        pipe_converter.__annotations__.update({"val": A, "return": A})
+    else:
+        # Get parameter type from first converter.
+        t = _AnnotationExtractor(converters[0]).get_first_param_type()
+        if t:
+            pipe_converter.__annotations__["val"] = t
+
+        last = converters[-1]
+        if not PY_3_11_PLUS and isinstance(last, Converter):
+            last = last.__call__
+
+        # Get return type from last converter.
+        rt = _AnnotationExtractor(last).get_return_type()
+        if rt:
+            pipe_converter.__annotations__["return"] = rt
+
+    if return_instance:
+        return Converter(pipe_converter, takes_self=True, takes_field=True)
+    return pipe_converter