642 lines
26 KiB
Python
642 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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"takes care of the option's values and multi values"
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# Copyright (C) 2013 Team tiramisu (see AUTHORS for all contributors)
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ____________________________________________________________
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from time import time
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from copy import copy
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import sys
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import weakref
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from tiramisu.error import ConfigError, SlaveError, PropertiesOptionError
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from tiramisu.setting import owners, multitypes, expires_time, undefined
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from tiramisu.autolib import carry_out_calculation
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from tiramisu.i18n import _
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from tiramisu.option import SymLinkOption
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class Values(object):
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"""The `Config`'s root is indeed in charge of the `Option()`'s values,
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but the values are physicaly located here, in `Values`, wich is also
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responsible of a caching utility.
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"""
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__slots__ = ('context', '_p_', '__weakref__')
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def __init__(self, context, storage):
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"""
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Initializes the values's dict.
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:param context: the context is the home config's values
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"""
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self.context = weakref.ref(context)
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# the storage type is dictionary or sqlite3
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self._p_ = storage
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def _getcontext(self):
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"""context could be None, we need to test it
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context is None only if all reference to `Config` object is deleted
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(for example we delete a `Config` and we manipulate a reference to
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old `SubConfig`, `Values`, `Multi` or `Settings`)
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"""
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context = self.context()
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if context is None:
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raise ConfigError(_('the context does not exist anymore'))
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return context
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def _getdefault(self, opt):
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"""
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actually retrieves the default value
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:param opt: the `option.Option()` object
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"""
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meta = self._getcontext().cfgimpl_get_meta()
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if meta is not None:
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value = meta.cfgimpl_get_values()[opt]
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if isinstance(value, Multi):
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value = list(value)
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else:
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value = opt.impl_getdefault()
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if opt.impl_is_multi():
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return copy(value)
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else:
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return value
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def _getvalue(self, opt, path):
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"""actually retrieves the value
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:param opt: the `option.Option()` object
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:returns: the option's value (or the default value if not set)
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"""
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if not self._p_.hasvalue(path):
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# if there is no value
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value = self._getdefault(opt)
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else:
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# if there is a value
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value = self._p_.getvalue(path)
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return value
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def get_modified_values(self):
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return self._p_.get_modified_values()
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def __contains__(self, opt):
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"""
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implements the 'in' keyword syntax in order provide a pythonic way
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to kow if an option have a value
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:param opt: the `option.Option()` object
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"""
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path = self._get_opt_path(opt)
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return self._contains(path)
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def _contains(self, path):
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return self._p_.hasvalue(path)
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def __delitem__(self, opt):
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"""overrides the builtins `del()` instructions"""
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self.reset(opt)
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def reset(self, opt, path=None):
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if path is None:
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path = self._get_opt_path(opt)
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if self._p_.hasvalue(path):
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context = self._getcontext()
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setting = context.cfgimpl_get_settings()
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opt.impl_validate(opt.impl_getdefault(),
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context, 'validator' in setting)
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context.cfgimpl_reset_cache()
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if (opt.impl_is_multi() and
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opt.impl_get_multitype() == multitypes.master):
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for slave in opt.impl_get_master_slaves():
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self.reset(slave)
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self._p_.resetvalue(path)
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def _isempty(self, opt, value):
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"convenience method to know if an option is empty"
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empty = opt._empty
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if (not opt.impl_is_multi() and (value is None or value == empty)) or \
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(opt.impl_is_multi() and (value == [] or
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None in value or empty in value)):
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return True
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return False
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def _getcallback_value(self, opt, index=None, max_len=None):
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"""
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retrieves a value for the options that have a callback
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:param opt: the `option.Option()` object
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:param index: if an option is multi, only calculates the nth value
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:type index: int
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:returns: a calculated value
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"""
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callback, callback_params = opt._callback
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if callback_params is None:
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callback_params = {}
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return carry_out_calculation(opt, config=self._getcontext(),
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callback=callback,
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callback_params=callback_params,
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index=index, max_len=max_len)
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def __getitem__(self, opt):
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"enables us to use the pythonic dictionary-like access to values"
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return self.getitem(opt)
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def getitem(self, opt, path=None, validate=True, force_permissive=False,
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force_properties=None, validate_properties=True):
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if path is None:
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path = self._get_opt_path(opt)
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ntime = None
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setting = self._getcontext().cfgimpl_get_settings()
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if 'cache' in setting and self._p_.hascache(path):
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if 'expire' in setting:
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ntime = int(time())
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is_cached, value = self._p_.getcache(path, ntime)
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if is_cached:
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if opt.impl_is_multi() and not isinstance(value, Multi):
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#load value so don't need to validate if is not a Multi
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value = Multi(value, self.context, opt, path, validate=False)
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return value
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val = self._getitem(opt, path, validate, force_permissive,
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force_properties, validate_properties)
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if 'cache' in setting and validate and validate_properties and \
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force_permissive is False and force_properties is None:
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if 'expire' in setting:
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if ntime is None:
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ntime = int(time())
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ntime = ntime + expires_time
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self._p_.setcache(path, val, ntime)
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return val
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def _getitem(self, opt, path, validate, force_permissive, force_properties,
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validate_properties):
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# options with callbacks
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context = self._getcontext()
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setting = context.cfgimpl_get_settings()
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is_frozen = 'frozen' in setting[opt]
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# For calculating properties, we need value (ie for mandatory value).
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# If value is calculating with a PropertiesOptionError's option
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# _getcallback_value raise a ConfigError.
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# We can not raise ConfigError if this option should raise
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# PropertiesOptionError too. So we get config_error and raise
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# ConfigError if properties did not raise.
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config_error = None
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force_permissives = None
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# if value has callback and is not set
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# or frozen with force_default_on_freeze
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if opt.impl_has_callback() and (
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self._is_default_owner(path) or
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(is_frozen and 'force_default_on_freeze' in setting[opt])):
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lenmaster = None
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no_value_slave = False
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if (opt.impl_is_multi() and
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opt.impl_get_multitype() == multitypes.slave):
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masterp = self._get_opt_path(opt.impl_get_master_slaves())
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mastervalue = context._getattr(masterp, validate=validate)
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lenmaster = len(mastervalue)
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if lenmaster == 0:
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value = []
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no_value_slave = True
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if not no_value_slave:
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try:
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value = self._getcallback_value(opt, max_len=lenmaster)
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except ConfigError as err:
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# cannot assign config_err directly in python 3.3
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config_error = err
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value = None
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# should not raise PropertiesOptionError if option is
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# mandatory
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force_permissives = set(['mandatory'])
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else:
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if (opt.impl_is_multi() and
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opt.impl_get_multitype() == multitypes.slave):
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if not isinstance(value, list):
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value = [value for i in range(lenmaster)]
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if config_error is None:
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if opt.impl_is_multi():
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value = Multi(value, self.context, opt, path, validate)
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# suppress value if already set
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self.reset(opt, path)
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# frozen and force default
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elif is_frozen and 'force_default_on_freeze' in setting[opt]:
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value = self._getdefault(opt)
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if opt.impl_is_multi():
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value = Multi(value, self.context, opt, path, validate)
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else:
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value = self._getvalue(opt, path)
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if opt.impl_is_multi():
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# load value so don't need to validate if is not a Multi
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value = Multi(value, self.context, opt, path, validate=validate)
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if config_error is None and validate:
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opt.impl_validate(value, context, 'validator' in setting)
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if config_error is None and self._is_default_owner(path) and \
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'force_store_value' in setting[opt]:
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self.setitem(opt, value, path, is_write=False)
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if validate_properties:
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setting.validate_properties(opt, False, False, value=value, path=path,
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force_permissive=force_permissive,
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force_properties=force_properties,
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force_permissives=force_permissives)
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if config_error is not None:
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raise config_error
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return value
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def __setitem__(self, opt, value):
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raise ValueError('you should only set value with config')
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def setitem(self, opt, value, path, force_permissive=False,
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is_write=True):
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# is_write is, for example, used with "force_store_value"
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# user didn't change value, so not write
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# valid opt
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context = self._getcontext()
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opt.impl_validate(value, context,
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'validator' in context.cfgimpl_get_settings())
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if opt.impl_is_multi():
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value = Multi(value, self.context, opt, path, setitem=True)
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# Save old value
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if opt.impl_get_multitype() == multitypes.master and \
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self._p_.hasvalue(path):
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old_value = self._p_.getvalue(path)
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old_owner = self._p_.getowner(path, None)
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else:
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old_value = undefined
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old_owner = undefined
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self._setvalue(opt, path, value, force_permissive=force_permissive,
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is_write=is_write)
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if opt.impl_is_multi() and opt.impl_get_multitype() == multitypes.master:
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try:
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value._valid_master()
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except Exception, err:
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if old_value is not undefined:
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self._p_.setvalue(path, old_value, old_owner)
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else:
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self._p_.resetvalue(path)
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raise err
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def _setvalue(self, opt, path, value, force_permissive=False,
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force_properties=None,
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is_write=True, validate_properties=True):
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context = self._getcontext()
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context.cfgimpl_reset_cache()
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if validate_properties:
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setting = context.cfgimpl_get_settings()
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setting.validate_properties(opt, False, is_write,
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value=value, path=path,
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force_permissive=force_permissive,
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force_properties=force_properties)
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owner = context.cfgimpl_get_settings().getowner()
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if isinstance(value, Multi):
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value = list(value)
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self._p_.setvalue(path, value, owner)
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def getowner(self, opt):
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"""
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retrieves the option's owner
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:param opt: the `option.Option` object
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:returns: a `setting.owners.Owner` object
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"""
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if isinstance(opt, SymLinkOption):
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opt = opt._opt
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path = self._get_opt_path(opt)
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return self._getowner(path)
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def _getowner(self, path):
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owner = self._p_.getowner(path, owners.default)
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meta = self._getcontext().cfgimpl_get_meta()
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if owner is owners.default and meta is not None:
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owner = meta.cfgimpl_get_values()._getowner(path)
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return owner
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def setowner(self, opt, owner):
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"""
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sets a owner to an option
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:param opt: the `option.Option` object
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:param owner: a valid owner, that is a `setting.owners.Owner` object
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"""
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if not isinstance(owner, owners.Owner):
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raise TypeError(_("invalid generic owner {0}").format(str(owner)))
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path = self._get_opt_path(opt)
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self._setowner(path, owner)
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def _setowner(self, path, owner):
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if self._getowner(path) == owners.default:
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raise ConfigError(_('no value for {0} cannot change owner to {1}'
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'').format(path, owner))
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self._p_.setowner(path, owner)
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def is_default_owner(self, opt):
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"""
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:param config: *must* be only the **parent** config
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(not the toplevel config)
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:return: boolean
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"""
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path = self._get_opt_path(opt)
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return self._is_default_owner(path)
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def _is_default_owner(self, path):
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return self._getowner(path) == owners.default
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def reset_cache(self, only_expired):
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"""
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clears the cache if necessary
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"""
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if only_expired:
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self._p_.reset_expired_cache(int(time()))
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else:
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self._p_.reset_all_cache()
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def _get_opt_path(self, opt):
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"""
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retrieve the option's path in the config
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:param opt: the `option.Option` object
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:returns: a string with points like "gc.dummy.my_option"
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"""
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return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
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# information
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def set_information(self, key, value):
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"""updates the information's attribute
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:param key: information's key (ex: "help", "doc"
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:param value: information's value (ex: "the help string")
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"""
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self._p_.set_information(key, value)
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def get_information(self, key, default=None):
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"""retrieves one information's item
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:param key: the item string (ex: "help")
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"""
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try:
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return self._p_.get_information(key)
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except ValueError:
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if default is not None:
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return default
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else:
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raise ValueError(_("information's item"
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" not found: {0}").format(key))
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def mandatory_warnings(self):
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"""convenience function to trace Options that are mandatory and
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where no value has been set
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:returns: generator of mandatory Option's path
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"""
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#if value in cache, properties are not calculated
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self.reset_cache(False)
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context = self.context()
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for path in context.cfgimpl_get_description().impl_getpaths(
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include_groups=True):
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try:
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context._getattr(path,
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force_properties=frozenset(('mandatory',)))
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except PropertiesOptionError as err:
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if err.proptype == ['mandatory']:
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yield path
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self.reset_cache(False)
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def force_cache(self):
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"""parse all option to force data in cache
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"""
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context = self.context()
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if not 'cache' in context.cfgimpl_get_settings():
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raise ConfigError(_('can force cache only if cache '
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'is actived in config'))
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#remove all cached properties and value to update "expired" time
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context.cfgimpl_reset_cache()
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for path in context.cfgimpl_get_description().impl_getpaths(
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include_groups=True):
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try:
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context._getattr(path)
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except PropertiesOptionError:
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pass
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def __getstate__(self):
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return {'_p_': self._p_}
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def _impl_setstate(self, storage):
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self._p_._storage = storage
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def __setstate__(self, states):
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self._p_ = states['_p_']
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# ____________________________________________________________
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# multi types
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class Multi(list):
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"""multi options values container
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that support item notation for the values of multi options"""
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__slots__ = ('opt', 'path', 'context')
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def __init__(self, value, context, opt, path, validate=True,
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setitem=False):
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"""
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:param value: the Multi wraps a list value
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:param context: the home config that has the values
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:param opt: the option object that have this Multi value
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:param setitem: only if set a value
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"""
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if isinstance(value, Multi):
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raise ValueError(_('{0} is already a Multi ').format(opt._name))
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self.opt = opt
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self.path = path
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if not isinstance(context, weakref.ReferenceType):
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raise ValueError('context must be a Weakref')
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self.context = context
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if not isinstance(value, list):
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value = [value]
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if validate and self.opt.impl_get_multitype() == multitypes.slave:
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value = self._valid_slave(value, setitem)
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elif not setitem and validate and \
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self.opt.impl_get_multitype() == multitypes.master:
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self._valid_master()
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super(Multi, self).__init__(value)
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def _getcontext(self):
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"""context could be None, we need to test it
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context is None only if all reference to `Config` object is deleted
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(for example we delete a `Config` and we manipulate a reference to
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old `SubConfig`, `Values`, `Multi` or `Settings`)
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"""
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context = self.context()
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if context is None:
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raise ConfigError(_('the context does not exist anymore'))
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return context
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def _valid_slave(self, value, setitem):
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#if slave, had values until master's one
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context = self._getcontext()
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values = context.cfgimpl_get_values()
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masterp = context.cfgimpl_get_description().impl_get_path_by_opt(
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self.opt.impl_get_master_slaves())
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mastervalue = context._getattr(masterp, validate=False)
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masterlen = len(mastervalue)
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valuelen = len(value)
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if valuelen > masterlen or (valuelen < masterlen and setitem):
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raise SlaveError(_("invalid len for the slave: {0}"
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" which has {1} as master").format(
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self.opt._name, masterp))
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elif valuelen < masterlen:
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for num in range(0, masterlen - valuelen):
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if self.opt.impl_has_callback():
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# if callback add a value, but this value will not change
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# anymore automaticly (because this value has owner)
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index = value.__len__()
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value.append(values._getcallback_value(self.opt,
|
|
index=index))
|
|
else:
|
|
value.append(self.opt.impl_getdefault_multi())
|
|
#else: same len so do nothing
|
|
return value
|
|
|
|
def _valid_master(self):
|
|
#masterlen = len(value)
|
|
values = self._getcontext().cfgimpl_get_values()
|
|
for slave in self.opt._master_slaves:
|
|
path = values._get_opt_path(slave)
|
|
Multi(values._getvalue(slave, path), self.context, slave, path)
|
|
|
|
def __setitem__(self, index, value):
|
|
self._validate(value, index)
|
|
#assume not checking mandatory property
|
|
super(Multi, self).__setitem__(index, value)
|
|
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
|
|
|
|
def append(self, value=undefined, force=False):
|
|
"""the list value can be updated (appened)
|
|
only if the option is a master
|
|
"""
|
|
context = self._getcontext()
|
|
if not force:
|
|
if self.opt.impl_get_multitype() == multitypes.slave:
|
|
raise SlaveError(_("cannot append a value on a multi option {0}"
|
|
" which is a slave").format(self.opt._name))
|
|
elif self.opt.impl_get_multitype() == multitypes.master:
|
|
values = context.cfgimpl_get_values()
|
|
if value is undefined and self.opt.impl_has_callback():
|
|
value = values._getcallback_value(self.opt)
|
|
#Force None il return a list
|
|
if isinstance(value, list):
|
|
value = None
|
|
index = self.__len__()
|
|
if value is undefined:
|
|
value = self.opt.impl_getdefault_multi()
|
|
self._validate(value, index)
|
|
super(Multi, self).append(value)
|
|
context.cfgimpl_get_values()._setvalue(self.opt, self.path,
|
|
self,
|
|
validate_properties=not force)
|
|
if not force and self.opt.impl_get_multitype() == multitypes.master:
|
|
for slave in self.opt.impl_get_master_slaves():
|
|
path = values._get_opt_path(slave)
|
|
if not values._is_default_owner(path):
|
|
if slave.impl_has_callback():
|
|
dvalue = values._getcallback_value(slave, index=index)
|
|
else:
|
|
dvalue = slave.impl_getdefault_multi()
|
|
old_value = values.getitem(slave, path, validate=False,
|
|
validate_properties=False)
|
|
if len(old_value) + 1 != self.__len__():
|
|
raise SlaveError(_("invalid len for the slave: {0}"
|
|
" which has {1} as master").format(
|
|
self.opt._name, self.__len__()))
|
|
values.getitem(slave, path, validate=False,
|
|
validate_properties=False).append(
|
|
dvalue, force=True)
|
|
|
|
def sort(self, cmp=None, key=None, reverse=False):
|
|
if self.opt.impl_get_multitype() in [multitypes.slave,
|
|
multitypes.master]:
|
|
raise SlaveError(_("cannot sort multi option {0} if master or slave"
|
|
"").format(self.opt._name))
|
|
if sys.version_info[0] >= 3:
|
|
if cmp is not None:
|
|
raise ValueError(_('cmp is not permitted in python v3 or greater'))
|
|
super(Multi, self).sort(key=key, reverse=reverse)
|
|
else:
|
|
super(Multi, self).sort(cmp=cmp, key=key, reverse=reverse)
|
|
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
|
|
|
|
def reverse(self):
|
|
if self.opt.impl_get_multitype() in [multitypes.slave,
|
|
multitypes.master]:
|
|
raise SlaveError(_("cannot reverse multi option {0} if master or "
|
|
"slave").format(self.opt._name))
|
|
super(Multi, self).reverse()
|
|
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
|
|
|
|
def insert(self, index, obj):
|
|
if self.opt.impl_get_multitype() in [multitypes.slave,
|
|
multitypes.master]:
|
|
raise SlaveError(_("cannot insert multi option {0} if master or "
|
|
"slave").format(self.opt._name))
|
|
super(Multi, self).insert(index, obj)
|
|
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
|
|
|
|
def extend(self, iterable):
|
|
if self.opt.impl_get_multitype() in [multitypes.slave,
|
|
multitypes.master]:
|
|
raise SlaveError(_("cannot extend multi option {0} if master or "
|
|
"slave").format(self.opt._name))
|
|
super(Multi, self).extend(iterable)
|
|
self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
|
|
|
|
def _validate(self, value, force_index):
|
|
if value is not None:
|
|
try:
|
|
self.opt.impl_validate(value, context=self._getcontext(),
|
|
force_index=force_index)
|
|
except ValueError as err:
|
|
raise ValueError(_("invalid value {0} "
|
|
"for option {1}: {2}"
|
|
"").format(str(value),
|
|
self.opt._name, err))
|
|
|
|
def pop(self, index, force=False):
|
|
"""the list value can be updated (poped)
|
|
only if the option is a master
|
|
|
|
:param index: remove item a index
|
|
:type index: int
|
|
:param force: force pop item (withoud check master/slave)
|
|
:type force: boolean
|
|
:returns: item at index
|
|
"""
|
|
context = self._getcontext()
|
|
if not force:
|
|
if self.opt.impl_get_multitype() == multitypes.slave:
|
|
raise SlaveError(_("cannot pop a value on a multi option {0}"
|
|
" which is a slave").format(self.opt._name))
|
|
if self.opt.impl_get_multitype() == multitypes.master:
|
|
for slave in self.opt.impl_get_master_slaves():
|
|
values = context.cfgimpl_get_values()
|
|
if not values.is_default_owner(slave):
|
|
#get multi without valid properties
|
|
values.getitem(slave, validate=False,
|
|
validate_properties=False
|
|
).pop(index, force=True)
|
|
#set value without valid properties
|
|
ret = super(Multi, self).pop(index)
|
|
context.cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
|
|
return ret
|