<h2>Editing File: /lib64/python3.6/site-packages/setools/diff/bounds.py</h2><form method='post'><textarea name='content' class='file-edit'># Copyright 2016, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito &lt;pebenito@ieee.org&gt;
#
# 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
# &lt;http://www.gnu.org/licenses/&gt;.
#
from collections import namedtuple

from ..policyrep import BoundsRuletype
from .descriptors import DiffResultDescriptor
from .difference import Difference, Wrapper
from .types import type_wrapper_factory


modified_bounds_record = namedtuple(&quot;modified_bound&quot;, [&quot;rule&quot;, &quot;added_bound&quot;, &quot;removed_bound&quot;])


class BoundsDifference(Difference):

    &quot;&quot;&quot;Determine the difference in *bounds between two policies.&quot;&quot;&quot;

    added_typebounds = DiffResultDescriptor(&quot;diff_typebounds&quot;)
    removed_typebounds = DiffResultDescriptor(&quot;diff_typebounds&quot;)
    modified_typebounds = DiffResultDescriptor(&quot;diff_typebounds&quot;)

    # Lists of rules for each policy
    _left_typebounds = None
    _right_typebounds = None

    def diff_typebounds(self):
        &quot;&quot;&quot;Generate the difference in typebound rules between the policies.&quot;&quot;&quot;

        self.log.info(&quot;Generating typebounds differences from {0.left_policy} to {0.right_policy}&quot;.
                      format(self))

        if self._left_typebounds is None or self._right_typebounds is None:
            self._create_typebound_lists()

        self.added_typebounds, self.removed_typebounds, matched_typebounds = self._set_diff(
            (BoundsWrapper(c) for c in self._left_typebounds),
            (BoundsWrapper(c) for c in self._right_typebounds),
            key=lambda b: str(b.child))

        self.modified_typebounds = []

        for left_bound, right_bound in matched_typebounds:
            if type_wrapper_factory(left_bound.parent) != type_wrapper_factory(right_bound.parent):
                self.modified_typebounds.append(modified_bounds_record(
                    left_bound, right_bound.parent, left_bound.parent))

    #
    # Internal functions
    #
    def _create_typebound_lists(self):
        &quot;&quot;&quot;Create rule lists for both policies.&quot;&quot;&quot;
        self._left_typebounds = []
        for rule in self.left_policy.bounds():
            if rule.ruletype == BoundsRuletype.typebounds:
                self._left_typebounds.append(rule)
            else:
                self.log.error(&quot;Unknown rule type: {0} (This is an SETools bug)&quot;.
                               format(rule.ruletype))

        self._right_typebounds = []
        for rule in self.right_policy.bounds():
            if rule.ruletype == BoundsRuletype.typebounds:
                self._right_typebounds.append(rule)
            else:
                self.log.error(&quot;Unknown rule type: {0} (This is an SETools bug)&quot;.
                               format(rule.ruletype))

    def _reset_diff(self):
        &quot;&quot;&quot;Reset diff results on policy changes.&quot;&quot;&quot;
        self.log.debug(&quot;Resetting all *bounds differences&quot;)
        self.added_typebounds = None
        self.removed_typebounds = None

        # Sets of rules for each policy
        self._left_typebounds = None
        self._right_typebounds = None


class BoundsWrapper(Wrapper):

    &quot;&quot;&quot;Wrap *bounds for diff purposes.&quot;&quot;&quot;

    __slots__ = (&quot;ruletype&quot;, &quot;parent&quot;, &quot;child&quot;)

    def __init__(self, rule):
        self.origin = rule
        self.ruletype = rule.ruletype
        self.parent = type_wrapper_factory(rule.parent)
        self.child = type_wrapper_factory(rule.child)
        self.key = hash(rule)

    def __hash__(self):
        return self.key

    def __lt__(self, other):
        return self.key &lt; other.key

    def __eq__(self, other):
        return self.ruletype == other.ruletype and \
            self.child == other.child
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