68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
# Copyright 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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"""argparse Custom Actions"""
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import argparse
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class KeyValueAction(argparse.Action):
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"""A custom action to parse arguments as key=value pairs
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Ensures that ``dest`` is a dict
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"""
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def __call__(self, parser, namespace, values, option_string=None):
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# Make sure we have an empty dict rather than None
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if getattr(namespace, self.dest, None) is None:
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setattr(namespace, self.dest, {})
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# Add value if an assignment else remove it
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if '=' in values:
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getattr(namespace, self.dest, {}).update([values.split('=', 1)])
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else:
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getattr(namespace, self.dest, {}).pop(values, None)
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class RangeAction(argparse.Action):
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"""A custom action to parse a single value or a range of values
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Parses single integer values or a range of integer values delimited
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by a colon and returns a tuple of integers:
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'4' sets ``dest`` to (4, 4)
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'6:9' sets ``dest`` to (6, 9)
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"""
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def __call__(self, parser, namespace, values, option_string=None):
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range = values.split(':')
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if len(range) == 0:
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# Nothing passed, return a zero default
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setattr(namespace, self.dest, (0, 0))
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elif len(range) == 1:
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# Only a single value is present
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setattr(namespace, self.dest, (int(range[0]), int(range[0])))
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elif len(range) == 2:
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# Range of two values
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if int(range[0]) <= int(range[1]):
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setattr(namespace, self.dest, (int(range[0]), int(range[1])))
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else:
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msg = "Invalid range, %s is not less than %s" % \
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(range[0], range[1])
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raise argparse.ArgumentError(self, msg)
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else:
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# Too many values
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msg = "Invalid range, too many values"
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raise argparse.ArgumentError(self, msg)
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