view roundup/anypy/cmp_.py @ 8050:093d2e0761d4

docs: add directions on saving the key to the pgp.mit.edu keyserver This is the keyserver we use in the docs. IT should always have the most up to date key.
author John Rouillard <rouilj@ieee.org>
date Mon, 01 Jul 2024 20:16:45 -0400
parents dec7de56f253
children
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line source

try:
    # will raise TypeError under python 3
    None < 0  # noqa: PLR0133, B015

    def NoneAndDictComparable(v):
        return v
except TypeError:
    # comparator to allow comparisons against None and dict
    # comparisons (these were allowed in Python 2, but aren't allowed
    # in Python 3 any more)
    class NoneAndDictComparable(object):   # noqa: PLW1641
        def __init__(self, value):
            self.value = value

        def __cmp__(self, other):  # noqa: PLW3201, PLR0911
            if not isinstance(other, self.__class__):
                raise TypeError('not comparable')

            if self.value == other.value:
                return 0

            elif self.value is None:
                return -1

            elif other.value is None:
                return 1

            elif type(self.value) is tuple and type(other.value) is tuple:
                for lhs, rhs in zip(self.value, other.value):
                    lhsCmp = NoneAndDictComparable(lhs)
                    rhsCmp = NoneAndDictComparable(rhs)
                    result = lhsCmp.__cmp__(rhsCmp)
                    if result != 0:
                        return result

                return len(self.value) - len(other.value)

            elif type(self.value) is dict and type(other.value) is dict:
                diff = len(self.value) - len(other.value)
                if diff == 0:
                    lhsItems = tuple(sorted(self.value.items(),
                                            key=NoneAndDictComparable))
                    rhsItems = tuple(sorted(other.value.items(),
                                            key=NoneAndDictComparable))
                    return -1 if NoneAndDictComparable(lhsItems) < NoneAndDictComparable(rhsItems) else 1
                else:
                    return diff

            elif self.value < other.value:
                return -1

            else:
                return 1

        def __eq__(self, other):
            return self.__cmp__(other) == 0

        def __ne__(self, other):
            return self.__cmp__(other) != 0

        def __lt__(self, other):
            return self.__cmp__(other) < 0

        def __le__(self, other):
            return self.__cmp__(other) <= 0

        def __ge__(self, other):
            return self.__cmp__(other) >= 0

        def __gt__(self, other):
            return self.__cmp__(other) > 0


def _test():
    # ruff: noqa: S101, B011, PLC0415, PLR2004
    import sys
    _py3 = sys.version_info[0] > 2

    Comp = NoneAndDictComparable

    assert Comp(None) < Comp(0)
    assert Comp(None) < Comp('')
    assert Comp(None) < Comp({})
    assert Comp((0, None)) < Comp((0, 0))
    assert not Comp(0) < Comp(None)
    assert not Comp('') < Comp(None)
    assert not Comp({}) < Comp(None)
    assert not Comp((0, 0)) < Comp((0, None))

    try:
        not Comp("") < Comp((0, None))
        if _py3:
            assert False, "Incompatible types are reporting comparable."
    except TypeError:
        pass

    assert Comp((0, 0)) < Comp((0, 0, None))
    assert Comp((0, None, None)) < Comp((0, 0, 0))

    assert Comp(0) < Comp(1)
    assert Comp(1) > Comp(0)
    assert not Comp(1) < Comp(0)
    assert not Comp(0) > Comp(0)

    assert Comp(0) <= Comp(1)
    assert Comp(1) >= Comp(0)
    assert not Comp(1) <= Comp(0)
    assert Comp(0) >= Comp(0)

    assert Comp({0: None}) < Comp({0: 0})
    assert Comp({0: 0}) < Comp({0: 1})

    assert Comp({0: 0}) == Comp({0: 0})
    assert Comp({0: 0}) != Comp({0: 1})
    assert Comp({0: 0, 1: 1}) > Comp({0: 1})
    assert Comp({0: 0, 1: 1}) < Comp({0: 0, 2: 2})


if __name__ == '__main__':
    _test()

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