/usr/lib/pybik/pybiklib/settings.py is in pybik 3.0-2.
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, 2011-2017 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 sys, os
from ast import literal_eval
from io import StringIO
from collections import OrderedDict
from contextlib import suppress
from . import config
current_settings_version = 3
class KeyStore:
def __init__(self):
self.schema = None
self.filename = None
self.keystore = {}
self.callback = lambda unused_key: None
self.globtree = GlobTree()
self.extra_lines = []
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):
if key not in self.keystore:
if value != self.get_default(key):
self.keystore[key] = value
self.callback(key)
elif self.keystore[key] != value:
self.keystore[key] = value
self.callback(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:
value = self.keystore[key]
except KeyError:
pass # already the default value
else:
del self.keystore[key]
if value != self.get_default(key):
self.callback(key)
else:
self.callback(None)
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:
if match(key, pattern):
return pattern
return None
def read_settings(self, filename):
from .schema import schema, deprecated
self.schema = schema
self.filename = filename
# read settings
lines = []
if self.filename:
dirname = os.path.dirname(self.filename)
if dirname and not os.path.exists(dirname):
os.makedirs(dirname)
try:
with open(self.filename, 'rt', encoding='utf-8') as settings_file:
text = settings_file.read()
lines = text.splitlines() # line breaks are not included
except FileNotFoundError:
pass
except Exception:
sys.excepthook(*sys.exc_info())
for line in lines:
try:
key, strvalue = line.split('=', 1)
except ValueError:
# discard invalid lines
continue
key = key.strip()
pattern = self.find_match(key)
if pattern is None:
# keep unknown keys, they may be settings of a different version
self.extra_lines.append(line)
continue
self.schema[key] = self.schema[pattern]
strvalue = strvalue.strip()
try:
value = literal_eval(strvalue)
except (ValueError, SyntaxError):
# discard invalid values
continue
# translate enums and validate values, discard invalid 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
self.build_globtree()
def build_globtree(self):
keys = list(self.schema.keys())
for key in keys:
subkeys = key.split('.')
if '*' in subkeys:
self.globtree.insert_key(subkeys)
def resolve_glob(self, key):
subkeys = key.split('.')
clone = self.globtree.find_key(subkeys)
assert clone is not None, subkeys
globkey = '.'.join(clone)
assert globkey != key
self.clone_key(globkey, key)
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)
if self.extra_lines:
#XXX: this line is discarded when loading the settings file
# because it does not contain a '='
print('# comments and keys unknown by version {}:'.format(config.VERSION), file=file)
for line in self.extra_lines:
print(line, file=file)
def write_settings(self):
if not self.filename:
return
buf = StringIO()
self.dump(buf)
tmpfilename = self.filename + '.tmp'
with suppress(OSError):
os.remove(tmpfilename)
try:
with open(tmpfilename, 'wt', encoding='utf-8') as settings_file:
settings_file.write(buf.getvalue())
os.replace(tmpfilename, self.filename)
except Exception:
sys.excepthook(*sys.exc_info())
def get_by_suffix(self, key):
if key.endswith('_nick'):
key = key[:-5]
func = self.get_nick
elif key.endswith('_range'):
key = key[:-6]
func = self.get_range
elif key.endswith('_default'):
key = key[:-8]
func = self.get_default
else:
func = self.get_value
try:
return func(key)
except KeyError:
self.resolve_glob(key)
return func(key)
def set_by_suffix(self, key, value):
if key.endswith('_nick'):
key = key[:-5]
func = self.set_nick
else:
func = self.set_value
try:
func(key, value)
except KeyError:
self.resolve_glob(key)
func(key, value)
def del_by_suffix(self, key):
try:
self.del_value(key)
except KeyError:
self.resolve_glob(key)
self.del_value(key)
class GlobTree:
__slots__ = 'nodes', 'leaves'
def __init__(self):
self.nodes = OrderedDict()
self.leaves = []
def insert_key(self, subkeys):
subkey, *subkeys = subkeys
if subkeys:
try:
node = self.nodes[subkey]
except KeyError:
node = GlobTree()
self.nodes[subkey] = node
node.insert_key(subkeys)
elif subkey not in self.leaves:
self.leaves.append(subkey)
else:
assert False
def find_key(self, subkeys):
subkey, *subkeys = subkeys
if subkeys:
for subkey in subkey, '*':
try:
node = self.nodes[subkey]
except KeyError:
continue
clone = node.find_key(subkeys)
if clone is not None:
return [subkey] + clone
return None
elif subkey in self.leaves:
return [subkey]
elif '*' in self.leaves:
return ['*']
else:
return None
class Settings:
__slots__ = ()
keystore = KeyStore()
dump = keystore.dump
@classmethod
def reset(self):
self.keystore.keystore.clear()
def load(self, filename):
self.keystore.read_settings(filename)
version = self['version']
if version != current_settings_version:
self['version'] = current_settings_version
return version
@classmethod
def connnect(self, callback):
self.keystore.callback = callback
@classmethod
def disconnect(self):
self.keystore.callback = lambda unused_key: None
@classmethod
def flush(self):
self.keystore.write_settings()
@staticmethod
def norm_key(key):
if type(key) is int:
return str(key)
elif type(key) is tuple:
def cvt_dot(keys):
for key in keys:
if type(key) is int:
yield str(key)
elif type(key) is tuple:
yield '_'.join(str(v) for v in key)
else:
yield from key.split('.')
return '.'.join(cvt_dot(key))
return key
def __getitem__(self, key):
key = self.norm_key(key)
return self.keystore.get_by_suffix(key)
def __setitem__(self, key, value):
key = self.norm_key(key)
self.keystore.set_by_suffix(key, value)
def __delitem__(self, key):
key = self.norm_key(key)
self.keystore.del_by_suffix(key)
settings = Settings()
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