/usr/lib/python3/dist-packages/ginga/misc/Settings.py is in python3-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Settings.py -- Simple class to manage stateful user preferences.
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
import os
import pprint
import ast
import numpy
from . import Callback
from . import Bunch
unset_value = ("^^UNSET^^")
class SettingError(Exception):
pass
class Setting(Callback.Callbacks):
def __init__(self, value=unset_value, name=None, logger=None,
check_fn=None):
Callback.Callbacks.__init__(self)
self.value = value
self._unset = (value == unset_value)
self.name = name
self.logger = logger
if check_fn is None:
check_fn = self._check_none
self.check_fn = check_fn
# For callbacks
for name in ('set', ):
self.enable_callback(name)
def _check_none(self, value):
return value
def set(self, value, callback=True):
self.value = self.check_fn(value)
if callback:
self.make_callback('set', value)
def get(self, *args):
if self._unset:
if len(args) == 0:
raise KeyError("setting['%s'] value is not set!" % (
self.name))
else:
assert len(args) == 1, \
SettingError("Illegal parameter use to get(): %s" % (
str(args)))
return args[0]
return self.value
def __repr__(self):
return repr(self.value)
def __str__(self):
return str(self.value)
class SettingGroup(object):
def __init__(self, name=None, logger=None, preffile=None):
self.name = name
self.logger = logger
self.preffile = preffile
self.group = Bunch.Bunch()
def addSettings(self, **kwdargs):
for key, value in kwdargs.items():
self.group[key] = Setting(value=value, name=key,
logger=self.logger)
# TODO: add group change callback?
def getSetting(self, key):
return self.group[key]
def shareSettings(self, other, keylist=None):
if keylist is None:
keylist = self.group.keys()
for key in keylist:
other.group[key] = self.group[key]
def copySettings(self, other, keylist=None):
if keylist is None:
keylist = self.group.keys()
d = {}
for key in keylist:
d[key] = self.get(key)
other.setDict(d)
def setdefault(self, key, value):
if key in self.group:
return self.group[key].get(value)
else:
d = { key: value }
self.addSettings(**d)
return self.group[key].get(value)
def addDefaults(self, **kwdargs):
for key, value in kwdargs.items():
self.setdefault(key, value)
def setDefaults(self, **kwdargs):
return self.addDefaults(**kwdargs)
def get(self, *args):
key = args[0]
if len(args) == 1:
return self.group[key].get()
if len(args) == 2:
return self.setdefault(key, args[1])
def getDict(self):
return dict([[name, self.group[name].value] for name in self.group.keys()])
def setDict(self, d, callback=True):
for key, value in d.items():
if key not in self.group:
self.setdefault(key, value)
else:
self.group[key].set(value, callback=callback)
def set(self, callback=True, **kwdargs):
self.setDict(kwdargs, callback=callback)
def __getitem__(self, key):
return self.group[key].value
def __setitem__(self, key, value):
self.group[key].set(value)
def has_key(self, key):
return key in self.group
def load(self, onError='raise'):
try:
d = {}
with open(self.preffile, 'r') as in_f:
buf = in_f.read()
for line in buf.split('\n'):
line = line.strip()
# skip comments and anything that doesn't look like an
# assignment
if line.startswith('#') or (not ('=' in line)):
continue
else:
try:
i = line.index('=')
key = line[:i].strip()
val = ast.literal_eval(line[i+1:].strip())
d[key] = val
except Exception as e:
# silently skip parse errors, for now
continue
self.setDict(d)
except Exception as e:
errmsg = "Error opening settings file (%s): %s" % (
self.preffile, str(e))
if onError == 'silent':
pass
elif onError == 'warn':
self.logger.warning(errmsg)
else:
raise SettingError(errmsg)
def _check(self, d):
if isinstance(d, dict):
for key, value in d.items():
d[key] = self._check(value)
return d
try:
if numpy.isnan(d):
return 0.0
elif numpy.isinf(d):
return 0.0
except Exception:
pass
return d
def save(self):
d = self.getDict()
# sanitize data -- hard to parse NaN or Inf
self._check(d)
try:
# sort keys for easy reading/editing
keys = list(d.keys())
keys.sort()
with open(self.preffile, 'w') as out_f:
for key in keys:
out_f.write("%s = %s\n" % (key, repr(d[key])))
except Exception as e:
errmsg = "Error opening settings file (%s): %s" % (
self.preffile, str(e))
self.logger.error(errmsg)
class Preferences(object):
def __init__(self, basefolder=None, logger=None):
self.folder = basefolder
self.logger = logger
self.settings = Bunch.Bunch(caseless=True)
def setDefaults(self, category, **kwdargs):
self.settings[category].addDefaults(**kwdargs)
def getSettings(self, category):
return self.settings[category]
def remove_settings(self, category):
del self.settings[category]
def get_dict_category(self, category):
return self.settings[category].getDict()
def createCategory(self, category):
if category not in self.settings:
suffix = '.cfg'
path = os.path.join(self.folder, category + suffix)
self.settings[category] = SettingGroup(logger=self.logger,
name=category,
preffile=path)
return self.settings[category]
def get_baseFolder(self):
return self.folder
def getDict(self):
return dict([[name, self.settings[name].getDict()] for name in
self.settings.keys()])
#END
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