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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 .._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"]
node.validate_keys(valid_symbols)
self.values = node.get_str_list("values", default=[])
if not self.values:
raise LoadError(
"{}: No values specified for {} option '{}'".format(
node.get_provenance(), self.OPTION_TYPE, self.name
),
LoadErrorReason.INVALID_DATA,
)
# Allow subclass to define the default value
self.value = self.load_default_value(node)
def load_value(self, node, *, transform=None):
value_node = node.get_scalar(self.name)
if transform:
self.value = transform(value_node)
else:
self.value = value_node.as_str()
self.validate(self.value, value_node)
def set_value(self, value):
self.validate(value)
self.value = value
def get_value(self):
return self.value
def validate(self, value, node=None):
if value not in self.values:
if node is not None:
provenance = node.get_provenance()
prefix = "{}: ".format(provenance)
else:
prefix = ""
raise LoadError(
"{}Invalid value for {} option '{}': {}\n".format(
prefix, self.OPTION_TYPE, self.name, value
)
+ "Valid values: {}".format(", ".join(self.values)),
LoadErrorReason.INVALID_DATA,
)
def load_default_value(self, node):
value_node = node.get_scalar("default")
value = value_node.as_str()
self.validate(value, value_node)
return value
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