sortable.py

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#  Copyright 2008-2015 Nokia Networks
#  Copyright 2016-     Robot Framework Foundation
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
 
from operator import eq, lt, le, gt, ge
 
from .robottypes import type_name
 
 
 
class Sortable():
 
    
    _sort_key = NotImplemented
 
    def __test(self, operator, other, require_sortable=True):
        if isinstance(other, Sortable):
            return operator(self._sort_key_sort_key, other._sort_key)
        if not require_sortable:
            return False
        raise TypeError("Cannot sort '%s' and '%s'."
                        % (type_name(self), type_name(other)))
 
    def __eq__(self, other):
        return self.__test__test(eq, other, require_sortable=False)
 
    def __ne__(self, other):
        return not self == other
 
    def __lt__(self, other):
        return self.__test__test(lt, other)
 
    def __le__(self, other):
        return self.__test__test(le, other)
 
    def __gt__(self, other):
        return self.__test__test(gt, other)
 
    def __ge__(self, other):
        return self.__test__test(ge, other)
 
    def __hash__(self):
        return hash(self._sort_key_sort_key)