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