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Add src/allmydata/util/verlib.py, which is a copy of verlib from https://bitbucket.org/tarek/distutilsversion/src/17df9a7d96ef . It is used to normalize and compare versions of dependencies. refs #1258
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david-sarah
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src/allmydata/util/verlib.py
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327
src/allmydata/util/verlib.py
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"""
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"Rational" version definition and parsing for DistutilsVersionFight
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discussion at PyCon 2009.
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"""
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import re
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class IrrationalVersionError(Exception):
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"""This is an irrational version."""
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pass
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class HugeMajorVersionNumError(IrrationalVersionError):
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"""An irrational version because the major version number is huge
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(often because a year or date was used).
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See `error_on_huge_major_num` option in `NormalizedVersion` for details.
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This guard can be disabled by setting that option False.
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"""
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pass
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# A marker used in the second and third parts of the `parts` tuple, for
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# versions that don't have those segments, to sort properly. An example
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# of versions in sort order ('highest' last):
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# 1.0b1 ((1,0), ('b',1), ('f',))
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# 1.0.dev345 ((1,0), ('f',), ('dev', 345))
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# 1.0 ((1,0), ('f',), ('f',))
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# 1.0.post256.dev345 ((1,0), ('f',), ('f', 'post', 256, 'dev', 345))
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# 1.0.post345 ((1,0), ('f',), ('f', 'post', 345, 'f'))
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# ^ ^ ^
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# 'b' < 'f' ---------------------/ | |
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# | |
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# 'dev' < 'f' < 'post' -------------------/ |
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# |
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# 'dev' < 'f' ----------------------------------------------/
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# Other letters would do, but 'f' for 'final' is kind of nice.
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FINAL_MARKER = ('f',)
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VERSION_RE = re.compile(r'''
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^
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(?P<version>\d+\.\d+) # minimum 'N.N'
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(?P<extraversion>(?:\.\d+)*) # any number of extra '.N' segments
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(?:
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(?P<prerel>[abc]|rc) # 'a'=alpha, 'b'=beta, 'c'=release candidate
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# 'rc'= alias for release candidate
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(?P<prerelversion>\d+(?:\.\d+)*)
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)?
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(?P<postdev>(\.post(?P<post>\d+))?(\.dev(?P<dev>\d+))?)?
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$''', re.VERBOSE)
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class NormalizedVersion(object):
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"""A rational version.
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Good:
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1.2 # equivalent to "1.2.0"
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1.2.0
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1.2a1
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1.2.3a2
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1.2.3b1
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1.2.3c1
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1.2.3.4
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TODO: fill this out
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Bad:
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1 # mininum two numbers
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1.2a # release level must have a release serial
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1.2.3b
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"""
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def __init__(self, s, error_on_huge_major_num=True):
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"""Create a NormalizedVersion instance from a version string.
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@param s {str} The version string.
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@param error_on_huge_major_num {bool} Whether to consider an
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apparent use of a year or full date as the major version number
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an error. Default True. One of the observed patterns on PyPI before
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the introduction of `NormalizedVersion` was version numbers like this:
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2009.01.03
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20040603
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2005.01
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This guard is here to strongly encourage the package author to
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use an alternate version, because a release deployed into PyPI
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and, e.g. downstream Linux package managers, will forever remove
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the possibility of using a version number like "1.0" (i.e.
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where the major number is less than that huge major number).
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"""
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self._parse(s, error_on_huge_major_num)
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@classmethod
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def from_parts(cls, version, prerelease=FINAL_MARKER,
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devpost=FINAL_MARKER):
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return cls(cls.parts_to_str((version, prerelease, devpost)))
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def _parse(self, s, error_on_huge_major_num=True):
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"""Parses a string version into parts."""
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match = VERSION_RE.search(s)
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if not match:
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raise IrrationalVersionError(s)
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groups = match.groupdict()
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parts = []
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# main version
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block = self._parse_numdots(groups['version'], s, False, 2)
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extraversion = groups.get('extraversion')
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if extraversion not in ('', None):
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block += self._parse_numdots(extraversion[1:], s)
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parts.append(tuple(block))
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# prerelease
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prerel = groups.get('prerel')
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if prerel is not None:
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block = [prerel]
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block += self._parse_numdots(groups.get('prerelversion'), s,
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pad_zeros_length=1)
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parts.append(tuple(block))
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else:
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parts.append(FINAL_MARKER)
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# postdev
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if groups.get('postdev'):
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post = groups.get('post')
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dev = groups.get('dev')
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postdev = []
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if post is not None:
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postdev.extend([FINAL_MARKER[0], 'post', int(post)])
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if dev is None:
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postdev.append(FINAL_MARKER[0])
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if dev is not None:
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postdev.extend(['dev', int(dev)])
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parts.append(tuple(postdev))
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else:
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parts.append(FINAL_MARKER)
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self.parts = tuple(parts)
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if error_on_huge_major_num and self.parts[0][0] > 1980:
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raise HugeMajorVersionNumError("huge major version number, %r, "
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"which might cause future problems: %r" % (self.parts[0][0], s))
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def _parse_numdots(self, s, full_ver_str, drop_trailing_zeros=True,
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pad_zeros_length=0):
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"""Parse 'N.N.N' sequences, return a list of ints.
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@param s {str} 'N.N.N..." sequence to be parsed
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@param full_ver_str {str} The full version string from which this
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comes. Used for error strings.
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@param drop_trailing_zeros {bool} Whether to drop trailing zeros
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from the returned list. Default True.
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@param pad_zeros_length {int} The length to which to pad the
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returned list with zeros, if necessary. Default 0.
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"""
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nums = []
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for n in s.split("."):
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if len(n) > 1 and n[0] == '0':
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raise IrrationalVersionError("cannot have leading zero in "
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"version number segment: '%s' in %r" % (n, full_ver_str))
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nums.append(int(n))
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if drop_trailing_zeros:
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while nums and nums[-1] == 0:
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nums.pop()
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while len(nums) < pad_zeros_length:
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nums.append(0)
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return nums
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def __str__(self):
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return self.parts_to_str(self.parts)
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@classmethod
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def parts_to_str(cls, parts):
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"""Transforms a version expressed in tuple into its string
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representation."""
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# XXX This doesn't check for invalid tuples
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main, prerel, postdev = parts
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s = '.'.join(str(v) for v in main)
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if prerel is not FINAL_MARKER:
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s += prerel[0]
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s += '.'.join(str(v) for v in prerel[1:])
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if postdev and postdev is not FINAL_MARKER:
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if postdev[0] == 'f':
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postdev = postdev[1:]
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i = 0
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while i < len(postdev):
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if i % 2 == 0:
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s += '.'
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s += str(postdev[i])
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i += 1
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return s
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def __repr__(self):
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return "%s('%s')" % (self.__class__.__name__, self)
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def _cannot_compare(self, other):
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raise TypeError("cannot compare %s and %s"
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% (type(self).__name__, type(other).__name__))
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def __eq__(self, other):
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if not isinstance(other, NormalizedVersion):
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self._cannot_compare(other)
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return self.parts == other.parts
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def __lt__(self, other):
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if not isinstance(other, NormalizedVersion):
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self._cannot_compare(other)
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return self.parts < other.parts
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def __ne__(self, other):
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return not self.__eq__(other)
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def __gt__(self, other):
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return not (self.__lt__(other) or self.__eq__(other))
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def __le__(self, other):
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return self.__eq__(other) or self.__lt__(other)
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def __ge__(self, other):
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return self.__eq__(other) or self.__gt__(other)
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def suggest_normalized_version(s):
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"""Suggest a normalized version close to the given version string.
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If you have a version string that isn't rational (i.e. NormalizedVersion
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doesn't like it) then you might be able to get an equivalent (or close)
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rational version from this function.
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This does a number of simple normalizations to the given string, based
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on observation of versions currently in use on PyPI. Given a dump of
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those version during PyCon 2009, 4287 of them:
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- 2312 (53.93%) match NormalizedVersion without change
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- with the automatic suggestion
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- 3474 (81.04%) match when using this suggestion method
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@param s {str} An irrational version string.
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@returns A rational version string, or None, if couldn't determine one.
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"""
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try:
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NormalizedVersion(s)
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return s # already rational
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except IrrationalVersionError:
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pass
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rs = s.lower()
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# part of this could use maketrans
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for orig, repl in (('-alpha', 'a'), ('-beta', 'b'), ('alpha', 'a'),
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('beta', 'b'), ('rc', 'c'), ('-final', ''),
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('-pre', 'c'),
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('-release', ''), ('.release', ''), ('-stable', ''),
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('+', '.'), ('_', '.'), (' ', ''), ('.final', ''),
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('final', '')):
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rs = rs.replace(orig, repl)
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# if something ends with dev or pre, we add a 0
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rs = re.sub(r"pre$", r"pre0", rs)
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rs = re.sub(r"dev$", r"dev0", rs)
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# if we have something like "b-2" or "a.2" at the end of the
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# version, that is pobably beta, alpha, etc
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# let's remove the dash or dot
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rs = re.sub(r"([abc|rc])[\-\.](\d+)$", r"\1\2", rs)
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# 1.0-dev-r371 -> 1.0.dev371
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# 0.1-dev-r79 -> 0.1.dev79
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rs = re.sub(r"[\-\.](dev)[\-\.]?r?(\d+)$", r".\1\2", rs)
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# Clean: 2.0.a.3, 2.0.b1, 0.9.0~c1
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rs = re.sub(r"[.~]?([abc])\.?", r"\1", rs)
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# Clean: v0.3, v1.0
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if rs.startswith('v'):
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rs = rs[1:]
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# Clean leading '0's on numbers.
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#TODO: unintended side-effect on, e.g., "2003.05.09"
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# PyPI stats: 77 (~2%) better
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rs = re.sub(r"\b0+(\d+)(?!\d)", r"\1", rs)
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# Clean a/b/c with no version. E.g. "1.0a" -> "1.0a0". Setuptools infers
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# zero.
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# PyPI stats: 245 (7.56%) better
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rs = re.sub(r"(\d+[abc])$", r"\g<1>0", rs)
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# the 'dev-rNNN' tag is a dev tag
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rs = re.sub(r"\.?(dev-r|dev\.r)\.?(\d+)$", r".dev\2", rs)
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# clean the - when used as a pre delimiter
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rs = re.sub(r"-(a|b|c)(\d+)$", r"\1\2", rs)
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# a terminal "dev" or "devel" can be changed into ".dev0"
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rs = re.sub(r"[\.\-](dev|devel)$", r".dev0", rs)
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# a terminal "dev" can be changed into ".dev0"
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rs = re.sub(r"(?![\.\-])dev$", r".dev0", rs)
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# a terminal "final" or "stable" can be removed
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rs = re.sub(r"(final|stable)$", "", rs)
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# The 'r' and the '-' tags are post release tags
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# 0.4a1.r10 -> 0.4a1.post10
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# 0.9.33-17222 -> 0.9.33.post17222
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# 0.9.33-r17222 -> 0.9.33.post17222
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rs = re.sub(r"\.?(r|-|-r)\.?(\d+)$", r".post\2", rs)
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# Clean 'r' instead of 'dev' usage:
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# 0.9.33+r17222 -> 0.9.33.dev17222
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# 1.0dev123 -> 1.0.dev123
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# 1.0.git123 -> 1.0.dev123
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# 1.0.bzr123 -> 1.0.dev123
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# 0.1a0dev.123 -> 0.1a0.dev123
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# PyPI stats: ~150 (~4%) better
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rs = re.sub(r"\.?(dev|git|bzr)\.?(\d+)$", r".dev\2", rs)
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# Clean '.pre' (normalized from '-pre' above) instead of 'c' usage:
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# 0.2.pre1 -> 0.2c1
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# 0.2-c1 -> 0.2c1
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# 1.0preview123 -> 1.0c123
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# PyPI stats: ~21 (0.62%) better
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rs = re.sub(r"\.?(pre|preview|-c)(\d+)$", r"c\g<2>", rs)
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# Tcl/Tk uses "px" for their post release markers
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rs = re.sub(r"p(\d+)$", r".post\1", rs)
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try:
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NormalizedVersion(rs)
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return rs # already rational
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except IrrationalVersionError:
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pass
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return None
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