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# Copyright 2014 Huawei Technologies Co. Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Module to load flags.
.. moduleauthor:: Xiaodong Wang <xiaodongwang@huawei.com>
"""
import sys
from optparse import OptionParser
class Flags(object):
"""Class to store flags."""
PARSER = OptionParser()
PARSED_OPTIONS = None
@classmethod
def parse_args(cls):
"""parse args."""
(options, argv) = Flags.PARSER.parse_args()
sys.argv = [sys.argv[0]] + argv
Flags.PARSED_OPTIONS = options
def __getattr__(self, name):
if Flags.PARSED_OPTIONS and hasattr(Flags.PARSED_OPTIONS, name):
return getattr(Flags.PARSED_OPTIONS, name)
for option in Flags.PARSER.option_list:
if option.dest == name:
return option.default
raise AttributeError('Option instance has no attribute %s' % name)
def __setattr__(self, name, value):
if Flags.PARSED_OPTIONS and hasattr(Flags.PARSED_OPTIONS, name):
setattr(Flags.PARSED_OPTIONS, name, value)
return
for option in Flags.PARSER.option_list:
if option.dest == name:
option.default = value
return
object.__setattr__(self, name, value)
OPTIONS = Flags()
def init():
"""Init flag parsing."""
OPTIONS.parse_args()
def add(flagname, **kwargs):
"""Add a flag name and its setting.
:param flagname: flag name declared in cmd as --<flagname>=...
:type flagname: str
"""
Flags.PARSER.add_option('--%s' % flagname,
dest=flagname, **kwargs)
def add_bool(flagname, default=True, **kwargs):
"""Add a bool flag name and its setting.
:param flagname: flag name declared in cmd as --[no]<flagname>.
:type flagname: str
:param default: default value
:type default: bool
"""
Flags.PARSER.add_option('--%s' % flagname,
dest=flagname, default=default,
action="store_true", **kwargs)
Flags.PARSER.add_option('--no%s' % flagname,
dest=flagname,
action="store_false", **kwargs)
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