| # |
| # Copyright (C) 2017 Codethink Limited |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU Lesser General Public |
| # License as published by the Free Software Foundation; either |
| # version 2 of the License, or (at your option) any later version. |
| # |
| # This library 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 |
| # Lesser General Public License for more details. |
| # |
| # You should have received a copy of the GNU Lesser General Public |
| # License along with this library. If not, see <http://www.gnu.org/licenses/>. |
| # |
| # Authors: |
| # Tristan Van Berkom <tristan.vanberkom@codethink.co.uk> |
| |
| from .. import _yaml |
| from .._exceptions import LoadError, LoadErrorReason |
| from .option import Option, OPTION_SYMBOLS |
| |
| |
| # OptionEnum |
| # |
| # An enumeration project option |
| # |
| class OptionEnum(Option): |
| |
| OPTION_TYPE = 'enum' |
| |
| def load(self, node, allow_default_definition=True): |
| super(OptionEnum, self).load(node) |
| |
| valid_symbols = OPTION_SYMBOLS + ['values'] |
| if allow_default_definition: |
| valid_symbols += ['default'] |
| |
| _yaml.node_validate(node, valid_symbols) |
| |
| self.values = _yaml.node_get(node, list, 'values', default_value=[]) |
| if not self.values: |
| raise LoadError(LoadErrorReason.INVALID_DATA, |
| "{}: No values specified for {} option '{}'" |
| .format(_yaml.node_get_provenance(node), self.OPTION_TYPE, self.name)) |
| |
| # Allow subclass to define the default value |
| self.value = self.load_default_value(node) |
| |
| def load_value(self, node, *, transform=None): |
| self.value = _yaml.node_get(node, str, self.name) |
| if transform: |
| self.value = transform(self.value) |
| self.validate(self.value, _yaml.node_get_provenance(node, self.name)) |
| |
| def set_value(self, value): |
| self.validate(value) |
| self.value = value |
| |
| def get_value(self): |
| return self.value |
| |
| def validate(self, value, provenance=None): |
| if value not in self.values: |
| prefix = "" |
| if provenance: |
| prefix = "{}: ".format(provenance) |
| raise LoadError(LoadErrorReason.INVALID_DATA, |
| "{}Invalid value for {} option '{}': {}\n" |
| .format(prefix, self.OPTION_TYPE, self.name, value) + |
| "Valid values: {}".format(", ".join(self.values))) |
| |
| def load_default_value(self, node): |
| value = _yaml.node_get(node, str, 'default') |
| self.validate(value, _yaml.node_get_provenance(node, 'default')) |
| return value |