/usr/lib/pybik/pybiklib/settings.py is in pybik 2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright © 2009, 2011-2015 B. Clausius <barcc@gmx.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
import os
from ast import literal_eval
from io import StringIO
from PyQt5.QtCore import QObject, QTimer
from PyQt5.QtCore import pyqtSignal as Signal
try:
from .debug import debug
except ImportError:
debug = print
from . import config
current_settings_version = 2
class KeyStore (QObject):
changed = Signal(str)
error = Signal(str)
def __init__(self):
super().__init__()
self.schema = None
self.filename = None
self.keystore = {}
def clone_key(self, keyfrom, keyto):
self.schema[keyto] = self.schema[keyfrom]
if keyfrom in self.keystore and keyto not in self.keystore:
self.keystore[keyto] = self.keystore[keyfrom]
def get_default(self, key):
return self.schema[key][0]
def get_validator(self, key):
return self.schema[key][1]
def get_range(self, key):
validator = self.get_validator(key)
if not isinstance(validator, (tuple, list)):
raise ValueError('{} is not a range'.format(key))
return validator
def get_value(self, key):
try:
return self.keystore[key]
except KeyError:
return self.get_default(key)
def get_nick(self, key):
value = self.get_value(key)
validator = self.get_validator(key)
if not isinstance(validator, list):
raise ValueError('{} is not an enum'.format(key))
return validator[value]
def set_value(self, key, value):
self.keystore[key] = value
self.changed.emit(key)
def set_nick(self, key, nick):
validator = self.get_validator(key)
if not isinstance(validator, list):
raise ValueError('{} is not an enum'.format(key))
value = validator.index(nick)
return self.set_value(key, value)
def del_value(self, key):
try:
del self.keystore[key]
except KeyError:
pass # already the default value
self.changed.emit(key)
def find_match(self, key):
def match(key, pattern):
key = key.split('.')
pattern = pattern.split('.')
for k, p in zip(key, pattern):
if k != p != '*':
return False
return True
for pattern in self.schema.keys():
if match(key, pattern):
return pattern
return None
def read_settings(self, filename):
from .schema import schema, deprecated
self.schema = schema
self.filename = filename
if not self.filename:
return
dirname = os.path.dirname(self.filename)
if dirname and not os.path.exists(dirname):
os.makedirs(dirname)
# read settings
try:
with open(self.filename, 'rt', encoding='utf-8') as settings_file:
lines = settings_file.readlines()
except FileNotFoundError:
lines = []
for line in lines:
# parse the line, discard invalid keys
try:
key, strvalue = line.split('=', 1)
except ValueError:
continue
key = key.strip()
strvalue = strvalue.strip()
pattern = self.find_match(key)
if pattern is None:
continue
self.schema[key] = self.schema[pattern]
try:
value = literal_eval(strvalue)
except (ValueError, SyntaxError):
continue
# translate enums and validate values
validator = self.get_validator(key)
if validator is deprecated:
pass
elif isinstance(validator, list):
try:
value = validator.index(value)
except ValueError:
continue
elif isinstance(validator, tuple):
if not validator[0] <= value <= validator[1]:
continue
elif validator is not None:
if not validator(value):
continue
self.keystore[key] = value
def dump(self, file, all=False): # pylint: disable=W0622
keydict = self.schema if all else self.keystore
for key in sorted(keydict.keys()):
if '*' in key:
continue
try:
# translate enums
value = self.get_nick(key)
except ValueError:
value = self.get_value(key)
print(key, '=', repr(value), file=file)
def write_settings(self):
if not self.filename:
return
buf = StringIO()
self.dump(buf)
try:
with open(self.filename, 'wt', encoding='utf-8') as settings_file:
settings_file.write(buf.getvalue())
except OSError as e:
error_message = _('Settings can not be written to file: '
'{error_message}').format(error_message=e)
debug(error_message)
self.error.emit(error_message)
class Values:
def __init__(self, key):
object.__setattr__(self, '_key', key)
object.__setattr__(self, '_subkeys_nodes', [])
object.__setattr__(self, '_subkeys_leaves', [])
def clone(self, key):
values = Values(key)
for subkey in self._subkeys_nodes:
values._add_attr(subkey, self[subkey].clone(key+subkey+'.'))
for subkey in self._subkeys_leaves:
settings.keystore.clone_key(self._key + subkey, key + subkey)
values._add_key(subkey)
return values
def sync(self, glob=None):
glob2 = self['*'] if '*' in self._subkeys_nodes else None
for subkey in self._subkeys_nodes:
if subkey == '*': # glob2 == self[subkey]
glob2.sync()
else:
self[subkey].sync(glob2)
if glob is not None and subkey in glob._subkeys_nodes:
self[subkey].sync(glob[subkey])
if glob is not None:
for subkey in glob._subkeys_nodes:
if subkey not in self._subkeys_nodes:
self._add_attr(subkey, glob[subkey].clone(self._key+subkey+'.'))
for subkey in glob._subkeys_leaves:
if subkey not in self._subkeys_leaves:
settings.keystore.clone_key(glob._key + subkey, self._key + subkey)
self._add_key(subkey)
def __getattr__(self, key):
if '.' in key:
value = self
subkeys = key.split('.')
for subkey in subkeys:
value = value[subkey]
return value
if key and key[0] == '_':
return super().__getattribute__(key)
if key.endswith('_nick'):
fullkey = self._key + key[:-5]
return settings.keystore.get_nick(fullkey)
if key.endswith('_range'):
fullkey = self._key + key[:-6]
return settings.keystore.get_range(fullkey)
if key in self._subkeys_leaves:
fullkey = self._key + key
return settings.keystore.get_value(fullkey)
if key in self._subkeys_nodes:
return super().__getattribute__(key)
if '*' in self._subkeys_leaves:
fullkey = self._key + key
settings.keystore.clone_key(self._key+'*', fullkey)
self._add_key(key)
return settings.keystore.get_value(fullkey)
if '*' in self._subkeys_nodes:
value = super().__getattribute__('*')
value = value.clone(self._key+key+'.')
self._add_attr(key, value)
return value
raise AttributeError('Unknown attribute "%s" in %s' % (key, self._key))
def __setattr__(self, key, value):
if '.' in key:
val = self
*subkeys, key = key.split('.')
for subkey in subkeys:
val = val[subkey]
return val.__setattr__(key, value)
if key.endswith('_nick'):
fullkey = self._key + key[:-5]
func = settings.keystore.set_nick
elif key in self._subkeys_leaves:
fullkey = self._key + key
func = settings.keystore.set_value
elif '*' in self._subkeys_leaves:
fullkey = self._key + key
settings.keystore.clone_key(self._key+'*', fullkey)
self._add_key(key)
func = settings.keystore.set_value
else:
raise AttributeError('unknown attribute {!r} in {!r}'.format(key, self._key))
func(fullkey, value)
if not settings._write_timer.isActive():
settings._write_timer.start()
def __delattr__(self, key):
if '.' in key:
value = self
*subkeys, key = key.split('.')
for subkey in subkeys:
value = value[subkey]
return value.__delattr__(key)
if key in self._subkeys_leaves:
fullkey = self._key + key
settings.keystore.del_value(fullkey)
if not settings._write_timer.isActive():
settings._write_timer.start()
else:
raise AttributeError('unknown attribute "%s"' % key)
def __getitem__(self, key):
if type(key) is int:
key = str(key)
elif type(key) is tuple:
key = '_'.join(str(v) for v in key)
return getattr(self, key)
def __setitem__(self, key, value):
return setattr(self, str(key), value)
def _add_attr(self, key, value):
assert key not in self._subkeys_nodes
assert key not in self._subkeys_leaves
self._subkeys_nodes.append(key)
super().__setattr__(key, value)
def _add_key(self, key):
assert key not in self._subkeys_nodes
assert key not in self._subkeys_leaves
self._subkeys_leaves.append(key)
class Settings:
keystore = KeyStore()
def __init__(self, key=''):
object.__setattr__(self, '_key', key)
object.__setattr__(self, '_array_len', 0)
object.__setattr__(self, '_values', Values(''))
object.__setattr__(self, '_write_timer', QTimer())
self._write_timer.setSingleShot(True)
self._write_timer.setInterval(5000)
self._write_timer.timeout.connect(self.on_write_timer_timeout)
def reset(self):
self._write_timer.stop()
self._write_timer.timeout.disconnect(self.on_write_timer_timeout)
self.keystore.keystore.clear()
self.__init__()
def load(self, filename):
self.keystore.read_settings(filename)
keys = list(self.keystore.schema.keys())
for key in keys:
subkeys = key.split('.')
settings_parent = self._values
for subkey in subkeys[:-1]:
if subkey.isdigit():
subkey = str(int(subkey))
try:
settings_child = getattr(settings_parent, subkey)
except (KeyError, AttributeError):
settings_child = Values(settings_parent._key + subkey + '.')
settings_parent._add_attr(subkey, settings_child)
assert isinstance(settings_child, Values), settings_child
settings_parent = settings_child
else:
if subkeys[-1] not in settings_parent._subkeys_leaves:
settings_parent._add_key(subkeys[-1])
self._values.sync()
version = settings.version
if version != current_settings_version:
settings.version = current_settings_version
return version
def on_write_timer_timeout(self):
self.keystore.write_settings()
def disconnect(self):
self.keystore.changed.disconnect()
self.keystore.error.disconnect()
self._write_timer.stop()
def flush(self):
self.keystore.write_settings()
def __getattr__(self, key):
return getattr(self._values, key)
def __setattr__(self, key, value):
setattr(self._values, key, value)
def __delattr__(self, key):
delattr(self._values, key)
def __getitem__(self, key):
return self._values[key]
settings = Settings()
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