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#
# 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 __init__(self, name, definition, pool):
self.values = None
super().__init__(name, definition, pool)
def load(self, node):
self.load_special(node)
def load_special(self, node, allow_default_definition=True):
super().load(node)
valid_symbols = OPTION_SYMBOLS + ['values']
if allow_default_definition:
valid_symbols += ['default']
_yaml.node_validate(node, valid_symbols)
self.values = node.get_sequence('values', default=[]).as_str_list()
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 = node.get_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 = node.get_str('default')
self.validate(value, _yaml.node_get_provenance(node, 'default'))
return value
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