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