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# Copyright 2016, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import typing
from PyQt6 import QtCore
import setools
from .. import details
from .modelroles import ModelRoles
from .table import SEToolsTableModel
HAS_PERMS: typing.Final[tuple[setools.ConstraintRuletype, ...]] = (
setools.ConstraintRuletype.constrain,
setools.ConstraintRuletype.mlsconstrain)
__all__ = ("ConstraintTable",)
class ConstraintTable(SEToolsTableModel[setools.Constraint]):
"""A table-based model for constraints."""
headers = ["Rule Type", "Class", "Permissions", "Expression"]
def data(self, index: QtCore.QModelIndex, role: int = ModelRoles.DisplayRole):
if not self.item_list or not index.isValid():
return None
row = index.row()
col = index.column()
rule = self.item_list[row]
match role:
case ModelRoles.DisplayRole:
match col:
case 0:
return rule.ruletype.name
case 1:
return rule.tclass.name
case 2:
if rule.ruletype in HAS_PERMS:
return ", ".join(sorted(rule.perms))
else:
return None
case 3:
return str(rule.expression)
case ModelRoles.ContextMenuRole:
if col == 2:
return details.objclass_detail_action(rule.tclass)
case ModelRoles.WhatsThisRole:
match col:
case 0:
column_whatsthis = \
"""
<p>This is the type of constraint.</p>
"""
case 1:
column_whatsthis = \
"""
<p>This is the object class of the constraint.</p>
"""
case 2:
if rule.ruletype in HAS_PERMS:
column_whatsthis = \
"""
<p>These are the permissions of the constraint.</p>
"""
else:
column_whatsthis = f"This column does not apply to {rule.ruletype}."
case 3:
column_whatsthis = \
"""
<p>This expression of the constraint.</p>
"""
case _:
column_whatsthis = ""
return \
f"""
<b><p>Table Representation of Constraints</p></b>
<p>Each part of the rule is represented as a column in the table.</p>
{column_whatsthis}
"""
return super().data(index, role)
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