/usr/lib/python3/dist-packages/checkbox/properties.py is in python3-checkbox 0.17.6-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of Checkbox.
#
# Copyright 2008 Canonical Ltd.
#
# Checkbox is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3,
# as published by the Free Software Foundation.
#
# Checkbox 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Checkbox. If not, see <http://www.gnu.org/licenses/>.
#
from checkbox.attribute import Attribute
from checkbox.variables import (ConstantVariable, BoolVariable, BytesVariable,
StringVariable, PathVariable, IntVariable, FloatVariable, TimeVariable,
ListVariable, TupleVariable, AnyVariable, DictVariable, MapVariable,
FileVariable, VariableFactory, Variable, get_variable)
class Property:
def __init__(self, variable_class=Variable, variable_kwargs={}):
self._variable_class = variable_class
self._variable_kwargs = variable_kwargs
def __get__(self, obj, cls=None):
if obj is None:
return self._get_attribute(cls)
if cls is None:
cls = type(obj)
attribute = self._get_attribute(cls)
variable = get_variable(obj, attribute)
return variable.get()
def __set__(self, obj, value):
cls = type(obj)
attribute = self._get_attribute(cls)
variable = get_variable(obj, attribute)
variable.set(value)
def _detect_name(self, used_cls):
self_id = id(self)
for cls in used_cls.__mro__:
for attr, prop in cls.__dict__.items():
if id(prop) == self_id:
return attr
raise RuntimeError("Property used in an unknown class")
def _get_attribute(self, cls):
try:
attribute = cls.__dict__["_checkbox_attributes"].get(self)
except KeyError:
cls._checkbox_attributes = {}
attribute = None
if attribute is None:
name = self._detect_name(cls)
attribute = PropertyAttribute(self, cls, name,
self._variable_class, self._variable_kwargs)
cls._checkbox_attributes[self] = attribute
return attribute
def coerce(self, value):
return self._variable_class(**self._variable_kwargs).coerce(value)
class PropertyAttribute(Attribute):
def __init__(self, prop, cls, name, variable_class, variable_kwargs):
super(PropertyAttribute, self).__init__(name, cls,
VariableFactory(variable_class, attribute=self, **variable_kwargs))
self.cls = cls # Used by references
# Copy attributes from the property to avoid one additional
# function call on each access.
for attr in ["__get__", "__set__"]:
setattr(self, attr, getattr(prop, attr))
class PropertyType(Property):
def __init__(self, **kwargs):
kwargs["value"] = kwargs.pop("default", None)
kwargs["value_factory"] = kwargs.pop("default_factory", None)
super(PropertyType, self).__init__(self.variable_class, kwargs)
class PropertyFactory(PropertyType):
def __init__(self, type=None, **kwargs):
if "default" in kwargs:
raise ValueError("'default' not allowed for factories. "
"Use 'default_factory' instead.")
if type is None:
type = Property()
kwargs["item_factory"] = VariableFactory(type._variable_class,
**type._variable_kwargs)
super(PropertyFactory, self).__init__(**kwargs)
class Constant(PropertyFactory):
variable_class = ConstantVariable
class Bool(PropertyType):
variable_class = BoolVariable
class Bytes(PropertyType):
variable_class = BytesVariable
class String(PropertyType):
variable_class = StringVariable
class Path(PropertyType):
variable_class = PathVariable
class Int(PropertyType):
variable_class = IntVariable
class Float(PropertyType):
variable_class = FloatVariable
class Time(PropertyType):
variable_class = TimeVariable
class List(PropertyFactory):
variable_class = ListVariable
def __init__(self, *args, **kwargs):
kwargs["separator"] = kwargs.pop("separator", r"\s")
super(List, self).__init__(*args, **kwargs)
class Tuple(PropertyFactory):
variable_class = TupleVariable
class Any(PropertyType):
variable_class = AnyVariable
def __init__(self, schemas=[], **kwargs):
kwargs["schemas"] = [VariableFactory(schema._variable_class,
**schema._variable_kwargs) for schema in schemas]
self.schemas = schemas
super(Any, self).__init__(**kwargs)
class Dict(PropertyType):
variable_class = DictVariable
def __init__(self, key, value, **kwargs):
kwargs["key_schema"] = VariableFactory(key._variable_class,
**key._variable_kwargs)
kwargs["value_schema"] = VariableFactory(value._variable_class,
**value._variable_kwargs)
super(Dict, self).__init__(**kwargs)
class Map(PropertyType):
variable_class = MapVariable
def __init__(self, schema={}, **kwargs):
for key, type in schema.items():
schema[key] = VariableFactory(type._variable_class,
**type._variable_kwargs)
kwargs["schema"] = schema
super(Map, self).__init__(**kwargs)
class File(PropertyType):
variable_class = FileVariable
class Message(Map):
def __init__(self, type, schema={}, **kwargs):
self.type = type
schema["type"] = Constant(default_factory=lambda: type, type=String())
super(Message, self).__init__(schema, **kwargs)
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