300 lines
11 KiB
Python
300 lines
11 KiB
Python
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#
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# distutils/version.py
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#
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# Implements multiple version numbering conventions for the
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# Python Module Distribution Utilities.
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#
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# $Id: version.py 29687 2002-11-14 02:25:42Z akuchling $
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#
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"""Provides classes to represent module version numbers (one class for
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each style of version numbering). There are currently two such classes
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implemented: StrictVersion and LooseVersion.
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Every version number class implements the following interface:
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* the 'parse' method takes a string and parses it to some internal
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representation; if the string is an invalid version number,
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'parse' raises a ValueError exception
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* the class constructor takes an optional string argument which,
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if supplied, is passed to 'parse'
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* __str__ reconstructs the string that was passed to 'parse' (or
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an equivalent string -- ie. one that will generate an equivalent
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version number instance)
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* __repr__ generates Python code to recreate the version number instance
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* __cmp__ compares the current instance with either another instance
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of the same class or a string (which will be parsed to an instance
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of the same class, thus must follow the same rules)
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"""
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import string, re
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from types import StringType
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class Version:
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"""Abstract base class for version numbering classes. Just provides
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constructor (__init__) and reproducer (__repr__), because those
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seem to be the same for all version numbering classes.
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"""
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def __init__ (self, vstring=None):
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if vstring:
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self.parse(vstring)
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def __repr__ (self):
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return "%s ('%s')" % (self.__class__.__name__, str(self))
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# Interface for version-number classes -- must be implemented
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# by the following classes (the concrete ones -- Version should
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# be treated as an abstract class).
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# __init__ (string) - create and take same action as 'parse'
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# (string parameter is optional)
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# parse (string) - convert a string representation to whatever
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# internal representation is appropriate for
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# this style of version numbering
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# __str__ (self) - convert back to a string; should be very similar
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# (if not identical to) the string supplied to parse
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# __repr__ (self) - generate Python code to recreate
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# the instance
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# __cmp__ (self, other) - compare two version numbers ('other' may
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# be an unparsed version string, or another
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# instance of your version class)
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class StrictVersion (Version):
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"""Version numbering for anal retentives and software idealists.
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Implements the standard interface for version number classes as
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described above. A version number consists of two or three
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dot-separated numeric components, with an optional "pre-release" tag
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on the end. The pre-release tag consists of the letter 'a' or 'b'
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followed by a number. If the numeric components of two version
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numbers are equal, then one with a pre-release tag will always
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be deemed earlier (lesser) than one without.
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The following are valid version numbers (shown in the order that
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would be obtained by sorting according to the supplied cmp function):
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0.4 0.4.0 (these two are equivalent)
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0.4.1
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0.5a1
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0.5b3
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0.5
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0.9.6
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1.0
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1.0.4a3
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1.0.4b1
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1.0.4
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The following are examples of invalid version numbers:
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1
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2.7.2.2
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1.3.a4
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1.3pl1
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1.3c4
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The rationale for this version numbering system will be explained
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in the distutils documentation.
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"""
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version_re = re.compile(r'^(\d+) \. (\d+) (\. (\d+))? ([ab](\d+))?$',
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re.VERBOSE)
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def parse (self, vstring):
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match = self.version_re.match(vstring)
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if not match:
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raise ValueError, "invalid version number '%s'" % vstring
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(major, minor, patch, prerelease, prerelease_num) = \
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match.group(1, 2, 4, 5, 6)
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if patch:
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self.version = tuple(map(string.atoi, [major, minor, patch]))
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else:
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self.version = tuple(map(string.atoi, [major, minor]) + [0])
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if prerelease:
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self.prerelease = (prerelease[0], string.atoi(prerelease_num))
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else:
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self.prerelease = None
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def __str__ (self):
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if self.version[2] == 0:
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vstring = string.join(map(str, self.version[0:2]), '.')
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else:
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vstring = string.join(map(str, self.version), '.')
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if self.prerelease:
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vstring = vstring + self.prerelease[0] + str(self.prerelease[1])
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return vstring
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def __cmp__ (self, other):
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if isinstance(other, StringType):
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other = StrictVersion(other)
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compare = cmp(self.version, other.version)
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if (compare == 0): # have to compare prerelease
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# case 1: neither has prerelease; they're equal
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# case 2: self has prerelease, other doesn't; other is greater
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# case 3: self doesn't have prerelease, other does: self is greater
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# case 4: both have prerelease: must compare them!
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if (not self.prerelease and not other.prerelease):
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return 0
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elif (self.prerelease and not other.prerelease):
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return -1
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elif (not self.prerelease and other.prerelease):
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return 1
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elif (self.prerelease and other.prerelease):
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return cmp(self.prerelease, other.prerelease)
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else: # numeric versions don't match --
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return compare # prerelease stuff doesn't matter
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# end class StrictVersion
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# The rules according to Greg Stein:
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# 1) a version number has 1 or more numbers separate by a period or by
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# sequences of letters. If only periods, then these are compared
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# left-to-right to determine an ordering.
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# 2) sequences of letters are part of the tuple for comparison and are
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# compared lexicographically
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# 3) recognize the numeric components may have leading zeroes
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#
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# The LooseVersion class below implements these rules: a version number
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# string is split up into a tuple of integer and string components, and
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# comparison is a simple tuple comparison. This means that version
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# numbers behave in a predictable and obvious way, but a way that might
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# not necessarily be how people *want* version numbers to behave. There
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# wouldn't be a problem if people could stick to purely numeric version
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# numbers: just split on period and compare the numbers as tuples.
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# However, people insist on putting letters into their version numbers;
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# the most common purpose seems to be:
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# - indicating a "pre-release" version
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# ('alpha', 'beta', 'a', 'b', 'pre', 'p')
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# - indicating a post-release patch ('p', 'pl', 'patch')
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# but of course this can't cover all version number schemes, and there's
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# no way to know what a programmer means without asking him.
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#
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# The problem is what to do with letters (and other non-numeric
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# characters) in a version number. The current implementation does the
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# obvious and predictable thing: keep them as strings and compare
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# lexically within a tuple comparison. This has the desired effect if
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# an appended letter sequence implies something "post-release":
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# eg. "0.99" < "0.99pl14" < "1.0", and "5.001" < "5.001m" < "5.002".
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#
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# However, if letters in a version number imply a pre-release version,
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# the "obvious" thing isn't correct. Eg. you would expect that
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# "1.5.1" < "1.5.2a2" < "1.5.2", but under the tuple/lexical comparison
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# implemented here, this just isn't so.
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#
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# Two possible solutions come to mind. The first is to tie the
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# comparison algorithm to a particular set of semantic rules, as has
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# been done in the StrictVersion class above. This works great as long
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# as everyone can go along with bondage and discipline. Hopefully a
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# (large) subset of Python module programmers will agree that the
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# particular flavour of bondage and discipline provided by StrictVersion
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# provides enough benefit to be worth using, and will submit their
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# version numbering scheme to its domination. The free-thinking
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# anarchists in the lot will never give in, though, and something needs
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# to be done to accommodate them.
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#
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# Perhaps a "moderately strict" version class could be implemented that
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# lets almost anything slide (syntactically), and makes some heuristic
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# assumptions about non-digits in version number strings. This could
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# sink into special-case-hell, though; if I was as talented and
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# idiosyncratic as Larry Wall, I'd go ahead and implement a class that
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# somehow knows that "1.2.1" < "1.2.2a2" < "1.2.2" < "1.2.2pl3", and is
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# just as happy dealing with things like "2g6" and "1.13++". I don't
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# think I'm smart enough to do it right though.
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#
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# In any case, I've coded the test suite for this module (see
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# ../test/test_version.py) specifically to fail on things like comparing
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# "1.2a2" and "1.2". That's not because the *code* is doing anything
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# wrong, it's because the simple, obvious design doesn't match my
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# complicated, hairy expectations for real-world version numbers. It
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# would be a snap to fix the test suite to say, "Yep, LooseVersion does
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# the Right Thing" (ie. the code matches the conception). But I'd rather
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# have a conception that matches common notions about version numbers.
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class LooseVersion (Version):
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"""Version numbering for anarchists and software realists.
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Implements the standard interface for version number classes as
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described above. A version number consists of a series of numbers,
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separated by either periods or strings of letters. When comparing
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version numbers, the numeric components will be compared
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numerically, and the alphabetic components lexically. The following
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are all valid version numbers, in no particular order:
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1.5.1
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1.5.2b2
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161
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3.10a
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8.02
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3.4j
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1996.07.12
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3.2.pl0
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3.1.1.6
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2g6
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11g
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0.960923
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2.2beta29
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1.13++
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5.5.kw
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2.0b1pl0
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In fact, there is no such thing as an invalid version number under
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this scheme; the rules for comparison are simple and predictable,
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but may not always give the results you want (for some definition
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of "want").
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"""
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component_re = re.compile(r'(\d+ | [a-z]+ | \.)', re.VERBOSE)
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def __init__ (self, vstring=None):
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if vstring:
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self.parse(vstring)
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def parse (self, vstring):
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# I've given up on thinking I can reconstruct the version string
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# from the parsed tuple -- so I just store the string here for
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# use by __str__
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self.vstring = vstring
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components = filter(lambda x: x and x != '.',
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self.component_re.split(vstring))
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for i in range(len(components)):
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try:
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components[i] = int(components[i])
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except ValueError:
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pass
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self.version = components
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def __str__ (self):
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return self.vstring
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def __repr__ (self):
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return "LooseVersion ('%s')" % str(self)
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def __cmp__ (self, other):
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if isinstance(other, StringType):
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other = LooseVersion(other)
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return cmp(self.version, other.version)
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# end class LooseVersion
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