mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-24 13:55:16 +00:00
155 lines
4 KiB
Python
155 lines
4 KiB
Python
# 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__
|