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85 lines
2.1 KiB
Python
85 lines
2.1 KiB
Python
from __future__ import absolute_import, division, print_function
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from functools import total_ordering
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from ._funcs import astuple
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from ._make import attrib, attrs
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@total_ordering
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@attrs(eq=False, order=False, slots=True, frozen=True)
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class VersionInfo(object):
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"""
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A version object that can be compared to tuple of length 1--4:
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>>> attr.VersionInfo(19, 1, 0, "final") <= (19, 2)
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True
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>>> attr.VersionInfo(19, 1, 0, "final") < (19, 1, 1)
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True
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>>> vi = attr.VersionInfo(19, 2, 0, "final")
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>>> vi < (19, 1, 1)
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False
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>>> vi < (19,)
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False
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>>> vi == (19, 2,)
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True
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>>> vi == (19, 2, 1)
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False
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.. versionadded:: 19.2
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"""
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year = attrib(type=int)
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minor = attrib(type=int)
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micro = attrib(type=int)
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releaselevel = attrib(type=str)
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@classmethod
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def _from_version_string(cls, s):
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"""
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Parse *s* and return a _VersionInfo.
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"""
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v = s.split(".")
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if len(v) == 3:
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v.append("final")
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return cls(
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year=int(v[0]), minor=int(v[1]), micro=int(v[2]), releaselevel=v[3]
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)
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def _ensure_tuple(self, other):
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"""
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Ensure *other* is a tuple of a valid length.
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Returns a possibly transformed *other* and ourselves as a tuple of
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the same length as *other*.
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"""
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if self.__class__ is other.__class__:
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other = astuple(other)
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if not isinstance(other, tuple):
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raise NotImplementedError
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if not (1 <= len(other) <= 4):
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raise NotImplementedError
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return astuple(self)[: len(other)], other
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def __eq__(self, other):
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try:
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us, them = self._ensure_tuple(other)
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except NotImplementedError:
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return NotImplemented
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return us == them
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def __lt__(self, other):
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try:
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us, them = self._ensure_tuple(other)
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except NotImplementedError:
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return NotImplemented
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# Since alphabetically "dev0" < "final" < "post1" < "post2", we don't
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# have to do anything special with releaselevel for now.
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return us < them
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