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|
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
'''
This is a really crummy, slow Python implementation of the Mozilla
platform's nsIVersionComparator interface:
https://developer.mozilla.org/En/NsIVersionComparator
For more information, also see:
http://mxr.mozilla.org/mozilla/source/xpcom/glue/nsVersionComparator.cpp
'''
import re
import sys
class VersionPart(object):
'''
Examples:
>>> VersionPart('1')
(1, None, 0, None)
>>> VersionPart('1pre')
(1, 'pre', 0, None)
>>> VersionPart('1pre10')
(1, 'pre', 10, None)
>>> VersionPart('1pre10a')
(1, 'pre', 10, 'a')
>>> VersionPart('1+')
(2, 'pre', 0, None)
>>> VersionPart('*').numA == sys.maxint
True
>>> VersionPart('1') < VersionPart('2')
True
>>> VersionPart('2') > VersionPart('1')
True
>>> VersionPart('1') == VersionPart('1')
True
>>> VersionPart('1pre') > VersionPart('1')
False
>>> VersionPart('1') < VersionPart('1pre')
False
>>> VersionPart('1pre1') < VersionPart('1pre2')
True
>>> VersionPart('1pre10b') > VersionPart('1pre10a')
True
>>> VersionPart('1pre10b') == VersionPart('1pre10b')
True
>>> VersionPart('1pre10a') < VersionPart('1pre10b')
True
>>> VersionPart('1') > VersionPart('')
True
'''
_int_part = re.compile('[+-]?(\d*)(.*)')
_num_chars = '0123456789+-'
def __init__(self, part):
self.numA = 0
self.strB = None
self.numC = 0
self.extraD = None
if not part:
return
if part == '*':
self.numA = sys.maxint
else:
match = self._int_part.match(part)
self.numA = int(match.group(1))
self.strB = match.group(2) or None
if self.strB == '+':
self.strB = 'pre'
self.numA += 1
elif self.strB:
i = 0
num_found = -1
for char in self.strB:
if char in self._num_chars:
num_found = i
break
i += 1
if num_found != -1:
match = self._int_part.match(self.strB[num_found:])
self.numC = int(match.group(1))
self.extraD = match.group(2) or None
self.strB = self.strB[:num_found]
def _strcmp(self, str1, str2):
# Any string is *before* no string.
if str1 is None:
if str2 is None:
return 0
else:
return 1
if str2 is None:
return -1
return cmp(str1, str2)
def __cmp__(self, other):
r = cmp(self.numA, other.numA)
if r:
return r
r = self._strcmp(self.strB, other.strB)
if r:
return r
r = cmp(self.numC, other.numC)
if r:
return r
return self._strcmp(self.extraD, other.extraD)
def __repr__(self):
return repr((self.numA, self.strB, self.numC, self.extraD))
def compare(a, b):
'''
Examples:
>>> compare('1', '2')
-1
>>> compare('1', '1')
0
>>> compare('2', '1')
1
>>> compare('1.0pre1', '1.0pre2')
-1
>>> compare('1.0pre2', '1.0')
-1
>>> compare('1.0', '1.0.0')
0
>>> compare('1.0.0', '1.0.0.0')
0
>>> compare('1.0.0.0', '1.1pre')
-1
>>> compare('1.1pre', '1.1pre0')
0
>>> compare('1.1pre0', '1.0+')
0
>>> compare('1.0+', '1.1pre1a')
-1
>>> compare('1.1pre1a', '1.1pre1')
-1
>>> compare('1.1pre1', '1.1pre10a')
-1
>>> compare('1.1pre10a', '1.1pre10')
-1
>>> compare('1.1pre10a', '1.*')
-1
'''
a_parts = a.split('.')
b_parts = b.split('.')
if len(a_parts) < len(b_parts):
a_parts.extend([''] * (len(b_parts) - len(a_parts)))
else:
b_parts.extend([''] * (len(a_parts) - len(b_parts)))
for a_part, b_part in zip(a_parts, b_parts):
r = cmp(VersionPart(a_part), VersionPart(b_part))
if r:
return r
return 0
if __name__ == '__main__':
import doctest
doctest.testmod(verbose=True)
|
