049a2a09d5
Coerces string values to a boolean only when the prop is given a type=BoolStr. BoolStr only accepts string words, no shortened values, synonyms or integer values. When no acceptable value is found a TypeError or ValueError is raised. Setters and Constructor calls validate the attribute value as a fail-fast behavior. Change-Id: I382426325522227a83ec5234c5116da97e71cfa2 Closes-Bug: #1365724
41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
# 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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class BoolStr(object):
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"""A custom boolean/string hybrid type for resource.props.
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Translates a given value to the desired type.
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"""
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def __init__(self, given):
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"""A boolean parser.
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Interprets the given value as a boolean, ignoring whitespace and case.
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A TypeError is raised when interpreted as neither True nor False.
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"""
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expr = str(given).lower()
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if 'true' == expr:
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self.parsed = True
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elif 'false' == expr:
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self.parsed = False
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else:
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msg = 'Invalid as boolean: %s' % given
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raise ValueError(msg)
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def __bool__(self):
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return self.parsed
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__nonzero__ = __bool__
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def __str__(self):
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return str(self.parsed)
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