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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
# OptionFlags
#
# A flags project option
#
class OptionFlags(Option):
OPTION_TYPE = 'flags'
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_value_definitions=True):
super().load(node)
valid_symbols = OPTION_SYMBOLS + ['default']
if allow_value_definitions:
valid_symbols += ['values']
node.validate_keys(valid_symbols)
# Allow subclass to define the valid values
self.values = self.load_valid_values(node)
if not self.values:
raise LoadError(LoadErrorReason.INVALID_DATA,
"{}: No values specified for {} option '{}'"
.format(node.get_provenance(), self.OPTION_TYPE, self.name))
value_node = node.get_sequence('default', default=[])
self.value = value_node.as_str_list()
self.validate(self.value, value_node)
def load_value(self, node, *, transform=None):
value_node = node.get_sequence(self.name)
self.value = value_node.as_str_list()
if transform:
self.value = [transform(x) for x in self.value]
self.value = sorted(self.value)
self.validate(self.value, value_node)
def set_value(self, value):
# Strip out all whitespace, allowing: "value1, value2 , value3"
stripped = "".join(value.split())
# Get the comma separated values
list_value = stripped.split(',')
self.validate(list_value)
self.value = sorted(list_value)
def get_value(self):
return ",".join(self.value)
def validate(self, value, node=None):
for flag in value:
if flag not in self.values:
if node is not None:
provenance = node.get_provenance()
prefix = "{}: ".format(provenance)
else:
prefix = ""
raise LoadError(LoadErrorReason.INVALID_DATA,
"{}Invalid value for flags option '{}': {}\n"
.format(prefix, self.name, value) +
"Valid values: {}".format(", ".join(self.values)))
def load_valid_values(self, node):
# Allow the more descriptive error to raise when no values
# exist rather than bailing out here (by specifying default_value)
return node.get_sequence('values', default=[]).as_str_list()
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