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File Name : _cmp.py

# SPDX-License-Identifier: MIT

import functools
import types

from ._make import _make_ne

_operation_names = {"eq": "==", "lt": "<", "le": "<=", "gt": ">", "ge": ">="}

def cmp_using(
    eq=None,
    lt=None,
    le=None,
    gt=None,
    ge=None,
    require_same_type=True,
    class_name="Comparable",
):
    """
    Create a class that can be passed into `attrs.field`'s ``eq``, ``order``,
    and ``cmp`` arguments to customize field comparison.

The resulting class will have a full set of ordering methods if at least
    one of ``{lt, le, gt, ge}`` and ``eq``  are provided.

:param Optional[callable] eq: `callable` used to evaluate equality of two
        objects.
    :param Optional[callable] lt: `callable` used to evaluate whether one
        object is less than another object.
    :param Optional[callable] le: `callable` used to evaluate whether one
        object is less than or equal to another object.
    :param Optional[callable] gt: `callable` used to evaluate whether one
        object is greater than another object.
    :param Optional[callable] ge: `callable` used to evaluate whether one
        object is greater than or equal to another object.

:param bool require_same_type: When `True`, equality and ordering methods
        will return `NotImplemented` if objects are not of the same type.

:param Optional[str] class_name: Name of class. Defaults to 'Comparable'.

See `comparison` for more details.

.. versionadded:: 21.1.0
    """

body = {
        "__slots__": ["value"],
        "__init__": _make_init(),
        "_requirements": [],
        "_is_comparable_to": _is_comparable_to,
    }

# Add operations.
    num_order_functions = 0
    has_eq_function = False

if eq is not None:
        has_eq_function = True
        body["__eq__"] = _make_operator("eq", eq)
        body["__ne__"] = _make_ne()

if lt is not None:
        num_order_functions += 1
        body["__lt__"] = _make_operator("lt", lt)

if le is not None:
        num_order_functions += 1
        body["__le__"] = _make_operator("le", le)

if gt is not None:
        num_order_functions += 1
        body["__gt__"] = _make_operator("gt", gt)

if ge is not None:
        num_order_functions += 1
        body["__ge__"] = _make_operator("ge", ge)

type_ = types.new_class(
        class_name, (object,), {}, lambda ns: ns.update(body)
    )

# Add same type requirement.
    if require_same_type:
        type_._requirements.append(_check_same_type)

# Add total ordering if at least one operation was defined.
    if 0 < num_order_functions < 4:
        if not has_eq_function:
            # functools.total_ordering requires __eq__ to be defined,
            # so raise early error here to keep a nice stack.
            raise ValueError(
                "eq must be define is order to complete ordering from "
                "lt, le, gt, ge."
            )
        type_ = functools.total_ordering(type_)

return type_

def _make_init():
    """
    Create __init__ method.
    """

def __init__(self, value):
        """
        Initialize object with *value*.
        """
        self.value = value

return __init__

def _make_operator(name, func):
    """
    Create operator method.
    """

def method(self, other):
        if not self._is_comparable_to(other):
            return NotImplemented

result = func(self.value, other.value)
        if result is NotImplemented:
            return NotImplemented

return result

method.__name__ = f"__{name}__"
    method.__doc__ = (
        f"Return a {_operation_names[name]} b.  Computed by attrs."
    )

return method

def _is_comparable_to(self, other):
    """
    Check whether `other` is comparable to `self`.
    """
    for func in self._requirements:
        if not func(self, other):
            return False
    return True

def _check_same_type(self, other):
    """
    Return True if *self* and *other* are of the same type, False otherwise.
    """
    return other.value.__class__ is self.value.__class__

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_cmp.py	text/x-script.python	4 KB	root/root	0644	2024-09-04 06:22:37
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