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Edit File : _cmp.py \| Size : 4.04 KB
from __future__ import absolute_import, division, print_function import functools from ._compat import new_class 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 `attr.ib`'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_ = 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__ = "__%s__" % (name,) method.__doc__ = "Return a %s b. Computed by attrs." % ( _operation_names[name], ) 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__ Back

Edit File : _cmp.py | Size : 4.04 KB

from __future__ import absolute_import, division, print_function

import functools

from ._compat import new_class
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 `attr.ib`'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_ = 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__ = "__%s__" % (name,)
    method.__doc__ = "Return a %s b.  Computed by attrs." % (
        _operation_names[name],
    )

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__

Back