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85 lines
2.2 KiB
85 lines
2.2 KiB
7 months ago
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# Lint as: python2, python3
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# Copyright 2020 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import six
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from six.moves import zip
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class AutotestEnum(object):
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"""
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Utility class to implement Enum-like functionality.
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>>> e = Enum('String one', 'String two')
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>>> e.STRING_ONE
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0
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>>> e.STRING_TWO
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1
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>>> e.choices()
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[(0, 'String one'), (1, 'String two')]
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>>> e.get_value('String one')
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0
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>>> e.get_string(0)
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'String one'
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>>> e = Enum('Hello', 'Goodbye', string_values=True)
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>>> e.HELLO, e.GOODBYE
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('Hello', 'Goodbye')
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>>> e = Enum('One', 'Two', start_value=1)
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>>> e.ONE
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1
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>>> e.TWO
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2
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"""
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def __init__(self, *names, **kwargs):
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self.string_values = kwargs.get('string_values')
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start_value = kwargs.get('start_value', 0)
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step = kwargs.get('step', 1)
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self.names = names
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self.values = []
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for i, name in enumerate(names):
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if self.string_values:
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value = name
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else:
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value = i * step + start_value
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self.values.append(value)
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setattr(self, self.get_attr_name(name), value)
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@staticmethod
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def get_attr_name(string):
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return string.upper().replace(' ', '_')
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def choices(self):
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'Return choice list suitable for Django model choices.'
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return list(zip(self.values, self.names))
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def get_value(self, name):
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"""\
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Convert a string name to it's corresponding value. If a value
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is passed in, it is returned.
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"""
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if isinstance(name, six.integer_types) and not self.string_values:
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# name is already a value
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return name
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return getattr(self, self.get_attr_name(name))
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def get_string(self, value):
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' Given a value, get the string name for it.'
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if value not in self.values:
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raise ValueError('Value %s not in this enum' % value)
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index = self.values.index(value)
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return self.names[index]
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Enum = AutotestEnum
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