89 lines
3.5 KiB
Python
89 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2017-2019 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 pypy's guys: 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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from types import FunctionType
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from ..setting import undefined
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from ..i18n import _
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from .option import Option
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from ..autolib import carry_out_calculation, Calculation
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from ..error import ConfigError, display_list
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class ChoiceOption(Option):
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"""represents a choice out of several objects.
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The option can also have the value ``None``
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"""
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__slots__ = tuple()
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_type = 'choice'
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_display_name = _('choice')
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def __init__(self,
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name,
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doc,
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values,
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default=None,
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default_multi=None,
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multi=False,
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validators=None,
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properties=None,
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warnings_only=False):
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"""
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:param values: is a list of values the option can possibly take
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"""
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if not isinstance(values, (Calculation, tuple)):
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raise TypeError(_('values must be a tuple or a calculation for {0}'
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).format(name))
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self._choice_values = values
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super(ChoiceOption, self).__init__(name,
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doc,
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default=default,
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default_multi=default_multi,
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multi=multi,
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validators=validators,
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properties=properties,
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warnings_only=warnings_only)
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def impl_get_values(self,
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option_bag):
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if isinstance(self._choice_values, Calculation):
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values = self._choice_values.execute(option_bag)
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if values is not undefined and not isinstance(values, list):
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raise ConfigError(_('calculated values for {0} is not a list'
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'').format(self.impl_getname()))
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else:
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values = self._choice_values
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return values
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def _validate(self,
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value,
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option_bag,
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current_opt=undefined):
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values = self.impl_get_values(option_bag)
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if values is not undefined and value not in values:
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if len(values) == 1:
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raise ValueError(_('only "{0}" is allowed'
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'').format(values[0]))
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else:
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raise ValueError(_('only {0} are allowed'
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'').format(display_list(values, add_quote=True)))
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