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Editing: default.py

# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import NamedTuple, Optional

from ..policyrep import Default, DefaultRuletype, DefaultValue, DefaultRangeValue, ObjClass

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

class ModifiedDefault(NamedTuple):

"""Difference details for a modified default_*."""

rule: Default
    added_default: Optional[DefaultValue]
    removed_default: Optional[DefaultValue]
    added_default_range: Optional[DefaultRangeValue]
    removed_default_range: Optional[DefaultRangeValue]

class DefaultsDifference(Difference):

"""Determine the difference in default_* between two policies."""

added_defaults = DiffResultDescriptor("diff_defaults")
    removed_defaults = DiffResultDescriptor("diff_defaults")
    modified_defaults = DiffResultDescriptor("diff_defaults")

def diff_defaults(self) -> None:
        """Generate the difference in type defaults between the policies."""

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

self.added_defaults, self.removed_defaults, matched_defaults = self._set_diff(
            (DefaultWrapper(d) for d in self.left_policy.defaults()),
            (DefaultWrapper(d) for d in self.right_policy.defaults()))

self.modified_defaults = []

for left_default, right_default in matched_defaults:
            # Criteria for modified defaults
            # 1. change to default setting
            # 2. change to default range

if left_default.default != right_default.default:
                removed_default = left_default.default
                added_default = right_default.default
            else:
                removed_default = None
                added_default = None

try:
                if left_default.default_range != right_default.default_range:
                    removed_default_range = left_default.default_range
                    added_default_range = right_default.default_range
                else:
                    removed_default_range = None
                    added_default_range = None
            except AttributeError:
                removed_default_range = None
                added_default_range = None

if removed_default or removed_default_range:
                self.modified_defaults.append(
                    ModifiedDefault(left_default,
                                    added_default,
                                    removed_default,
                                    added_default_range,
                                    removed_default_range))

#
    # Internal functions
    #
    def _reset_diff(self) -> None:
        """Reset diff results on policy changes."""
        self.log.debug("Resetting default_* differences")
        self.added_defaults = None
        self.removed_defaults = None
        self.modified_defaults = None

class DefaultWrapper(Wrapper[Default]):

"""Wrap default_* to allow comparisons."""

__slots__ = ("ruletype", "tclass")

def __init__(self, default: Default) -> None:
        self.origin = default
        self.ruletype = default.ruletype
        self.tclass = SymbolWrapper(default.tclass)
        self.key = hash(default)

def __hash__(self):
        return self.key

def __lt__(self, other):
        return self.key < other.key

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

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