晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# Copyright 2015, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito <pebenito@ieee.org>
#
# This file is part of SETools.
#
# SETools is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 2.1 of
# the License, or (at your option) any later version.
#
# SETools is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with SETools.  If not, see
# <http://www.gnu.org/licenses/>.
#
from collections import defaultdict, namedtuple
from contextlib import suppress

from ..exception import NoCommon

from .descriptors import DiffResultDescriptor
from .difference import Difference, SymbolWrapper


modified_classes_record = namedtuple("modified_class", ["added_perms",
                                                        "removed_perms",
                                                        "matched_perms"])

_class_cache = defaultdict(dict)


def class_wrapper_factory(class_):
    """
    Wrap class from the specified policy.

    This caches results to prevent duplicate wrapper
    objects in memory.
    """

    try:
        return _class_cache[class_.policy][class_]
    except KeyError:
        c = SymbolWrapper(class_)
        _class_cache[class_.policy][class_] = c
        return c


class ObjClassDifference(Difference):

    """
    Determine the difference in object classes
    between two policies.
    """

    added_classes = DiffResultDescriptor("diff_classes")
    removed_classes = DiffResultDescriptor("diff_classes")
    modified_classes = DiffResultDescriptor("diff_classes")

    def diff_classes(self):
        """Generate the difference in object classes between the policies."""

        self.log.info(
            "Generating class differences from {0.left_policy} to {0.right_policy}".format(self))

        self.added_classes, self.removed_classes, matched_classes = self._set_diff(
            (SymbolWrapper(c) for c in self.left_policy.classes()),
            (SymbolWrapper(c) for c in self.right_policy.classes()))

        self.modified_classes = dict()

        for left_class, right_class in matched_classes:
            # Criteria for modified classes
            # 1. change to permissions (inherited common is expanded)

            left_perms = left_class.perms
            with suppress(NoCommon):
                left_perms |= left_class.common.perms

            right_perms = right_class.perms
            with suppress(NoCommon):
                right_perms |= right_class.common.perms

            added_perms, removed_perms, matched_perms = self._set_diff(left_perms,
                                                                       right_perms,
                                                                       unwrap=False)

            if added_perms or removed_perms:
                self.modified_classes[left_class] = modified_classes_record(added_perms,
                                                                            removed_perms,
                                                                            matched_perms)

    #
    # Internal functions
    #
    def _reset_diff(self):
        """Reset diff results on policy changes."""
        self.log.debug("Resetting object class differences")
        self.added_classes = None
        self.removed_classes = None
        self.modified_classes = None

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