305 lines
12 KiB
Python
305 lines
12 KiB
Python
# Copyright (C) 2012-2018 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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# The original `Config` design model is unproudly borrowed from
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# the rough gus of pypy: pypy: http://codespeak.net/svn/pypy/dist/pypy/config/
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# the whole pypy projet is under MIT licence
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# ____________________________________________________________
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"enables us to carry out a calculation and return an option's value"
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from typing import Any, Optional, Union, Callable, Dict, List
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from .error import PropertiesOptionError, ConfigError, SlaveError
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from .i18n import _
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from .setting import undefined, ConfigBag, OptionBag, Undefined
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from .storage import get_default_values_storages, get_default_settings_storages
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from .function import ParamValue, ParamContext, ParamIndex, ParamOption, Params
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# ____________________________________________________________
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def manager_callback(callbk: Union[ParamOption, ParamValue],
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option,
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index: Optional[int],
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orig_value,
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config_bag: ConfigBag,
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fromconsistency: List) -> Any:
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"""replace Param by true value"""
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if isinstance(callbk, ParamValue):
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return callbk.value
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if isinstance(callbk, ParamIndex):
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return index
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if config_bag is undefined:
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return undefined
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if isinstance(callbk, ParamContext):
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#Not an option, set full context
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return config_bag.context.duplicate(force_values=get_default_values_storages(),
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force_settings=get_default_settings_storages())
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opt = callbk.option
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if opt.issubdyn():
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opt = opt.impl_get_dynoption(option._rootpath,
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option.impl_getsuffix())
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path = opt.impl_getpath()
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if index is not None and opt.impl_is_master_slaves() and \
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opt.impl_get_master_slaves().in_same_group(option):
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if opt == option:
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index_ = None
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with_index = False
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elif opt.impl_is_master_slaves('slave'):
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index_ = index
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with_index = False
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else:
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index_ = None
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with_index = True
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else:
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index_ = None
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with_index = False
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if opt == option and orig_value is not undefined and \
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(not opt.impl_is_master_slaves('slave') or index is None):
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return orig_value
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# don't validate if option is option that we tried to validate
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config_bag = config_bag.copy()
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config_bag.set_permissive()
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config_bag.properties -= {'warnings'}
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option_bag = OptionBag()
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option_bag.set_option(opt,
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path,
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index_,
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config_bag)
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if fromconsistency:
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option_bag.fromconsistency = fromconsistency.copy()
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if opt == option:
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option_bag.config_bag.properties = frozenset()
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option_bag.config_bag.remove_validation()
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try:
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# get value
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value = config_bag.context.getattr(path,
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option_bag)
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if with_index:
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return value[index]
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return value
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except PropertiesOptionError as err:
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if callbk.notraisepropertyerror:
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raise err
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raise ConfigError(_('unable to carry out a calculation for "{}"'
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', {}').format(option.impl_get_display_name(), err))
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def carry_out_calculation(option,
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callback: Callable,
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callback_params: Optional[Params],
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index: Optional[int],
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config_bag: Optional[ConfigBag],
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fromconsistency: List,
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orig_value=undefined,
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is_validator: int=False):
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"""a function that carries out a calculation for an option's value
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:param option: the option
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:param callback: the name of the callback function
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:type callback: str
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:param callback_params: the callback's parameters
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(only keyword parameters are allowed)
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:type callback_params: dict
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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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:param is_validator: to know if carry_out_calculation is used to validate a value
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The callback_params is a dict. Key is used to build args (if key is '')
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and kwargs (otherwise). Values are tuple of:
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- values
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- tuple with option and boolean's force_permissive (True when don't raise
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if PropertiesOptionError)
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Values could have multiple values only when key is ''.
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* if no callback_params:
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=> calculate(<function func at 0x2092320>, [], {})
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* if callback_params={'': ('yes',)}
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=> calculate(<function func at 0x2092320>, ['yes'], {})
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* if callback_params={'value': ('yes',)}
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=> calculate(<function func at 0x165b320>, [], {'value': 'yes'})
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* if callback_params={'': ('yes', 'no')}
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=> calculate('yes', 'no')
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* if callback_params={'value': ('yes', 'no')}
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=> ValueError()
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* if callback_params={'': (['yes', 'no'],)}
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=> calculate(<function func at 0x176b320>, ['yes', 'no'], {})
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* if callback_params={'value': ('yes', 'no')}
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=> raises ValueError()
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* if callback_params={'': ((opt1, False),)}
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- a simple option:
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opt1 == 11
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=> calculate(<function func at 0x1cea320>, [11], {})
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- a multi option and not master/slave:
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opt1 == [1, 2, 3]
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=> calculate(<function func at 0x223c320>, [[1, 2, 3]], {})
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- option is master or slave of opt1:
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opt1 == [1, 2, 3]
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=> calculate(<function func at 0x223c320>, [1], {})
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=> calculate(<function func at 0x223c320>, [2], {})
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=> calculate(<function func at 0x223c320>, [3], {})
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- opt is a master or slave but not related to option:
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opt1 == [1, 2, 3]
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=> calculate(<function func at 0x11b0320>, [[1, 2, 3]], {})
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* if callback_params={'value': ((opt1, False),)}
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- a simple option:
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opt1 == 11
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=> calculate(<function func at 0x17ff320>, [], {'value': 11})
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- a multi option:
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opt1 == [1, 2, 3]
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=> calculate(<function func at 0x1262320>, [], {'value': [1, 2, 3]})
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* if callback_params={'': ((opt1, False), (opt2, False))}
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- two single options
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opt1 = 11
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opt2 = 12
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=> calculate(<function func at 0x217a320>, [11, 12], {})
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- a multi option with a simple option
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opt1 == [1, 2, 3]
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opt2 == 12
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=> calculate(<function func at 0x2153320>, [[1, 2, 3], 12], {})
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- a multi option with an other multi option but with same length
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opt1 == [1, 2, 3]
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opt2 == [11, 12, 13]
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=> calculate(<function func at 0x1981320>, [[1, 2, 3], [11, 12, 13]], {})
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- a multi option with an other multi option but with different length
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opt1 == [1, 2, 3]
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opt2 == [11, 12]
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=> calculate(<function func at 0x2384320>, [[1, 2, 3], [11, 12]], {})
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- a multi option without value with a simple option
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opt1 == []
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opt2 == 11
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=> calculate(<function func at 0xb65320>, [[], 12], {})
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* if callback_params={'value': ((opt1, False), (opt2, False))}
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=> raises ValueError()
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If index is not undefined, return a value, otherwise return:
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* a list if one parameters have multi option
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* a value otherwise
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If calculate return list, this list is extend to return value.
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"""
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args = []
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kwargs = {}
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# if callback_params has a callback, launch several time calculate()
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if option.issubdyn():
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#FIXME why here? should be a ParamSuffix !
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kwargs['suffix'] = option.impl_getsuffix()
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if callback_params:
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for callbk in callback_params.args:
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try:
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value = manager_callback(callbk,
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option,
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index,
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orig_value,
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config_bag,
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fromconsistency)
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if value is undefined:
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return undefined
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args.append(value)
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except PropertiesOptionError:
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pass
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for key, callbk in callback_params.kwargs.items():
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try:
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value = manager_callback(callbk,
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option,
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index,
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orig_value,
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config_bag,
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fromconsistency)
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if value is undefined:
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return undefined
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kwargs[key] = value
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except PropertiesOptionError:
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pass
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ret = calculate(option,
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callback,
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is_validator,
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args,
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kwargs)
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if isinstance(ret, list) and not option.impl_is_dynoptiondescription() and \
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option.impl_is_master_slaves('slave'):
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if args or kwargs:
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raise SlaveError(_('function "{}" with arguments "{}" and "{}" '
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'return the list "{}" for the slave option "{}"'
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'').format(callback.__name__,
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args,
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kwargs,
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ret,
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option.impl_get_display_name()))
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else:
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raise SlaveError(_('function "{}" return the list "{}" for the slave option "{}"'
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'').format(callback.__name__,
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ret,
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option.impl_getname()))
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return ret
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def calculate(option,
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callback: Callable,
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is_validator: bool,
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args,
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kwargs):
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"""wrapper that launches the 'callback'
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:param callback: callback function
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:param args: in the callback's arity, the unnamed parameters
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:param kwargs: in the callback's arity, the named parameters
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"""
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try:
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return callback(*args, **kwargs)
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except ValueError as err:
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if is_validator:
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raise err
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error = err
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except Exception as err:
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error = err
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if args or kwargs:
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msg = _('unexpected error "{0}" in function "{1}" with arguments "{3}" and "{4}" '
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'for option "{2}"').format(str(error),
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callback.__name__,
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option.impl_get_display_name(),
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args,
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kwargs)
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else:
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msg = _('unexpected error "{0}" in function "{1}" for option "{2}"'
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'').format(str(error),
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callback.__name__,
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option.impl_get_display_name())
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del error
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raise ConfigError(msg)
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