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# # distutils/version.py # # Implements multiple version numbering conventions for the # Python Module Distribution Utilities. # # $Id$ # """Provides classes to represent module version numbers (one class for each style of version numbering). There are currently two such classes implemented: StrictVersion and LooseVersion. Every version number class implements the following interface: * the 'parse' method takes a string and parses it to some internal representation; if the string is an invalid version number, 'parse' raises a ValueError exception * the class constructor takes an optional string argument which, if supplied, is passed to 'parse' * __str__ reconstructs the string that was passed to 'parse' (or an equivalent string -- ie. one that will generate an equivalent version number instance) * __repr__ generates Python code to recreate the version number instance * _cmp compares the current instance with either another instance of the same class or a string (which will be parsed to an instance of the same class, thus must follow the same rules) """ import contextlib import re import warnings @contextlib.contextmanager def suppress_known_deprecation(): with warnings.catch_warnings(record=True) as ctx: warnings.filterwarnings( action='default', category=DeprecationWarning, message="distutils Version classes are deprecated.", ) yield ctx class Version: """Abstract base class for version numbering classes. Just provides constructor (__init__) and reproducer (__repr__), because those seem to be the same for all version numbering classes; and route rich comparisons to _cmp. """ def __init__(self, vstring=None): if vstring: self.parse(vstring) warnings.warn( "distutils Version classes are deprecated. Use packaging.version instead.", DeprecationWarning, stacklevel=2, ) def __repr__(self): return f"{self.__class__.__name__} ('{self}')" def __eq__(self, other): c = self._cmp(other) if c is NotImplemented: return c return c == 0 def __lt__(self, other): c = self._cmp(other) if c is NotImplemented: return c return c < 0 def __le__(self, other): c = self._cmp(other) if c is NotImplemented: return c return c <= 0 def __gt__(self, other): c = self._cmp(other) if c is NotImplemented: return c return c > 0 def __ge__(self, other): c = self._cmp(other) if c is NotImplemented: return c return c >= 0 # Interface for version-number classes -- must be implemented # by the following classes (the concrete ones -- Version should # be treated as an abstract class). # __init__ (string) - create and take same action as 'parse' # (string parameter is optional) # parse (string) - convert a string representation to whatever # internal representation is appropriate for # this style of version numbering # __str__ (self) - convert back to a string; should be very similar # (if not identical to) the string supplied to parse # __repr__ (self) - generate Python code to recreate # the instance # _cmp (self, other) - compare two version numbers ('other' may # be an unparsed version string, or another # instance of your version class) class StrictVersion(Version): """Version numbering for anal retentives and software idealists. Implements the standard interface for version number classes as described above. A version number consists of two or three dot-separated numeric components, with an optional "pre-release" tag on the end. The pre-release tag consists of the letter 'a' or 'b' followed by a number. If the numeric components of two version numbers are equal, then one with a pre-release tag will always be deemed earlier (lesser) than one without. The following are valid version numbers (shown in the order that would be obtained by sorting according to the supplied cmp function): 0.4 0.4.0 (these two are equivalent) 0.4.1 0.5a1 0.5b3 0.5 0.9.6 1.0 1.0.4a3 1.0.4b1 1.0.4 The following are examples of invalid version numbers: 1 2.7.2.2 1.3.a4 1.3pl1 1.3c4 The rationale for this version numbering system will be explained in the distutils documentation. """ version_re = re.compile( r'^(\d+) \. (\d+) (\. (\d+))? ([ab](\d+))?$', re.VERBOSE | re.ASCII ) def parse(self, vstring): match = self.version_re.match(vstring) if not match: raise ValueError(f"invalid version number '{vstring}'") (major, minor, patch, prerelease, prerelease_num) = match.group(1, 2, 4, 5, 6) if patch: self.version = tuple(map(int, [major, minor, patch])) else: self.version = tuple(map(int, [major, minor])) + (0,) if prerelease: self.prerelease = (prerelease[0], int(prerelease_num)) else: self.prerelease = None def __str__(self): if self.version[2] == 0: vstring = '.'.join(map(str, self.version[0:2])) else: vstring = '.'.join(map(str, self.version)) if self.prerelease: vstring = vstring + self.prerelease[0] + str(self.prerelease[1]) return vstring def _cmp(self, other): if isinstance(other, str): with suppress_known_deprecation(): other = StrictVersion(other) elif not isinstance(other, StrictVersion): return NotImplemented if self.version == other.version: # versions match; pre-release drives the comparison return self._cmp_prerelease(other) return -1 if self.version < other.version else 1 def _cmp_prerelease(self, other): """ case 1: self has prerelease, other doesn't; other is greater case 2: self doesn't have prerelease, other does: self is greater case 3: both or neither have prerelease: compare them! """ if self.prerelease and not other.prerelease: return -1 elif not self.prerelease and other.prerelease: return 1 if self.prerelease == other.prerelease: return 0 elif self.prerelease < other.prerelease: return -1 else: return 1 # end class StrictVersion # The rules according to Greg Stein: # 1) a version number has 1 or more numbers separated by a period or by # sequences of letters. If only periods, then these are compared # left-to-right to determine an ordering. # 2) sequences of letters are part of the tuple for comparison and are # compared lexicographically # 3) recognize the numeric components may have leading zeroes # # The LooseVersion class below implements these rules: a version number # string is split up into a tuple of integer and string components, and # comparison is a simple tuple comparison. This means that version # numbers behave in a predictable and obvious way, but a way that might # not necessarily be how people *want* version numbers to behave. There # wouldn't be a problem if people could stick to purely numeric version # numbers: just split on period and compare the numbers as tuples. # However, people insist on putting letters into their version numbers; # the most common purpose seems to be: # - indicating a "pre-release" version # ('alpha', 'beta', 'a', 'b', 'pre', 'p') # - indicating a post-release patch ('p', 'pl', 'patch') # but of course this can't cover all version number schemes, and there's # no way to know what a programmer means without asking him. # # The problem is what to do with letters (and other non-numeric # characters) in a version number. The current implementation does the # obvious and predictable thing: keep them as strings and compare # lexically within a tuple comparison. This has the desired effect if # an appended letter sequence implies something "post-release": # eg. "0.99" < "0.99pl14" < "1.0", and "5.001" < "5.001m" < "5.002". # # However, if letters in a version number imply a pre-release version, # the "obvious" thing isn't correct. Eg. you would expect that # "1.5.1" < "1.5.2a2" < "1.5.2", but under the tuple/lexical comparison # implemented here, this just isn't so. # # Two possible solutions come to mind. The first is to tie the # comparison algorithm to a particular set of semantic rules, as has # been done in the StrictVersion class above. This works great as long # as everyone can go along with bondage and discipline. Hopefully a # (large) subset of Python module programmers will agree that the # particular flavour of bondage and discipline provided by StrictVersion # provides enough benefit to be worth using, and will submit their # version numbering scheme to its domination. The free-thinking # anarchists in the lot will never give in, though, and something needs # to be done to accommodate them. # # Perhaps a "moderately strict" version class could be implemented that # lets almost anything slide (syntactically), and makes some heuristic # assumptions about non-digits in version number strings. This could # sink into special-case-hell, though; if I was as talented and # idiosyncratic as Larry Wall, I'd go ahead and implement a class that # somehow knows that "1.2.1" < "1.2.2a2" < "1.2.2" < "1.2.2pl3", and is # just as happy dealing with things like "2g6" and "1.13++". I don't # think I'm smart enough to do it right though. # # In any case, I've coded the test suite for this module (see # ../test/test_version.py) specifically to fail on things like comparing # "1.2a2" and "1.2". That's not because the *code* is doing anything # wrong, it's because the simple, obvious design doesn't match my # complicated, hairy expectations for real-world version numbers. It # would be a snap to fix the test suite to say, "Yep, LooseVersion does # the Right Thing" (ie. the code matches the conception). But I'd rather # have a conception that matches common notions about version numbers. class LooseVersion(Version): """Version numbering for anarchists and software realists. Implements the standard interface for version number classes as described above. A version number consists of a series of numbers, separated by either periods or strings of letters. When comparing version numbers, the numeric components will be compared numerically, and the alphabetic components lexically. The following are all valid version numbers, in no particular order: 1.5.1 1.5.2b2 161 3.10a 8.02 3.4j 1996.07.12 3.2.pl0 3.1.1.6 2g6 11g 0.960923 2.2beta29 1.13++ 5.5.kw 2.0b1pl0 In fact, there is no such thing as an invalid version number under this scheme; the rules for comparison are simple and predictable, but may not always give the results you want (for some definition of "want"). """ component_re = re.compile(r'(\d+ | [a-z]+ | \.)', re.VERBOSE) def parse(self, vstring): # I've given up on thinking I can reconstruct the version string # from the parsed tuple -- so I just store the string here for # use by __str__ self.vstring = vstring components = [x for x in self.component_re.split(vstring) if x and x != '.'] for i, obj in enumerate(components): try: components[i] = int(obj) except ValueError: pass self.version = components def __str__(self): return self.vstring def __repr__(self): return f"LooseVersion ('{self}')" def _cmp(self, other): if isinstance(other, str): other = LooseVersion(other) elif not isinstance(other, LooseVersion): return NotImplemented if self.version == other.version: return 0 if self.version < other.version: return -1 if self.version > other.version: return 1 # end class LooseVersion
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