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91 lines
2.8 KiB
91 lines
2.8 KiB
3 years ago
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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# Copyright (C) 2003-2017 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import enum
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class IntEnum(enum.IntEnum):
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@classmethod
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def _check_value(cls, value):
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max = cls._maximum()
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if value < 0 or value > max:
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name = cls._short_name()
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raise ValueError(f"{name} must be between >= 0 and <= {max}")
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@classmethod
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def from_text(cls, text):
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text = text.upper()
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try:
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return cls[text]
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except KeyError:
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pass
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prefix = cls._prefix()
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if text.startswith(prefix) and text[len(prefix):].isdigit():
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value = int(text[len(prefix):])
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cls._check_value(value)
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try:
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return cls(value)
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except ValueError:
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return value
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raise cls._unknown_exception_class()
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@classmethod
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def to_text(cls, value):
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cls._check_value(value)
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try:
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return cls(value).name
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except ValueError:
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return f"{cls._prefix()}{value}"
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@classmethod
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def make(cls, value):
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"""Convert text or a value into an enumerated type, if possible.
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*value*, the ``int`` or ``str`` to convert.
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Raises a class-specific exception if a ``str`` is provided that
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cannot be converted.
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Raises ``ValueError`` if the value is out of range.
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Returns an enumeration from the calling class corresponding to the
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value, if one is defined, or an ``int`` otherwise.
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"""
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if isinstance(value, str):
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return cls.from_text(value)
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cls._check_value(value)
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try:
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return cls(value)
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except ValueError:
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return value
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@classmethod
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def _maximum(cls):
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raise NotImplementedError # pragma: no cover
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@classmethod
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def _short_name(cls):
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return cls.__name__.lower()
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@classmethod
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def _prefix(cls):
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return ''
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@classmethod
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def _unknown_exception_class(cls):
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return ValueError
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