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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| class Version: | ||
|
|
||
| def __init__(self, version): | ||
| self.version = version | ||
|
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| def __repr__(self): | ||
| return self.version | ||
|
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||
| def __eq__(self, other): | ||
| return Comparator().compare(self.version, other.version) == 0 | ||
|
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| def __ne__(self, other): | ||
| return not self == other | ||
|
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| def __lt__(self, other): | ||
| return Comparator().compare(self.version, other.version) < 0 | ||
|
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| def __le__(self, other): | ||
| return Comparator().compare(self.version, other.version) <= 0 | ||
|
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| def __gt__(self, other): | ||
| return Comparator().compare(self.version, other.version) > 0 | ||
|
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| def __ge__(self, other): | ||
| return Comparator().compare(self.version, other.version) >= 0 | ||
|
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| class Comparator: | ||
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| ''' | ||
| A comparator that semantically sorts versions. This comparator considers, | ||
| e.g., "10" to be greater than "9", in contrast to a lexical comparison. | ||
| Return: | ||
| 0 if version a == version b | ||
| <0 if version a < version b | ||
| >0 if version a > version b | ||
| Rules: | ||
| * version strings are broken into nodes delimited by '.' | ||
| * comparison is initially on the first node of each version | ||
| * if each node can both be converted to an integer, they are compared as such | ||
| * otherwise, the nodes are compared as strings | ||
| * if the comparison result of the first nodes is not 0, that result is returned | ||
| * else, the first nodes are equal | ||
| * if neither version has addition nodes, 0 is returned | ||
| * if each version has additional nodes, those nodes are compared as above | ||
| * else the version with the no more nodes remaining is considered the lesser version | ||
| ''' | ||
| def compare(self, a, b): | ||
| if a is None or b is None: | ||
| raise ValueError('version string cannot be None') | ||
| if not(isinstance(a, Version) or isinstance(a, str)) or not(isinstance(b, Version) or isinstance(b, str)): | ||
| raise TypeError('version must be an instance of a Version or str') | ||
| if not a or not b: | ||
| raise ValueError('version string cannot be empty') | ||
| def compareNodes(anodes, bnodes): | ||
| if len(anodes) == 0 and len(bnodes) == 0: | ||
| return 0 | ||
| if len(anodes) == 0: | ||
| return -1 | ||
| if len(bnodes) == 0: | ||
| return 1 | ||
| anode, bnode = anodes[0], bnodes[0] | ||
| try: | ||
| anode, bnode = int(anode), int(bnode) | ||
| except ValueError: | ||
| pass | ||
| if anode > bnode: | ||
| return 1 | ||
| elif anode < bnode: | ||
| return -1 | ||
| else: | ||
| return compareNodes(anodes[1:], bnodes[1:]) | ||
| return compareNodes(a.split('.'), b.split('.')) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| import sure | ||
| import unittest | ||
| import version | ||
|
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| class VersionTest(unittest.TestCase): | ||
|
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| def testStringRepresentation(self): | ||
| myversion = version.Version('1.2.3') | ||
| repr(myversion).should.equal('1.2.3') | ||
|
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| def testEqual(self): | ||
| a = version.Version('1.2.3') | ||
| b = version.Version('1.2.3') | ||
| a.should.equal(b) | ||
|
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| def testNotEqual(self): | ||
| a = version.Version('1.2.3') | ||
| b = version.Version('1.2.4') | ||
| a.should_not.equal(b) | ||
|
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| def testGreaterThan(self): | ||
| a = version.Version('10') | ||
| b = version.Version('9') | ||
| (a > b).should.be.true | ||
|
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| def testGreaterThanOrEquals(self): | ||
| a = version.Version('10') | ||
| b = version.Version('9') | ||
| c = version.Version('10') | ||
| (a >= b).should.be.true | ||
| (a >= c).should.be.true | ||
|
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| def testLessThan(self): | ||
| a = version.Version('9') | ||
| b = version.Version('10') | ||
| (a < b).should.be.true | ||
|
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| def testLessThanOrEqual(self): | ||
| a = version.Version('9') | ||
| b = version.Version('10') | ||
| c = version.Version('9') | ||
| (a <= b).should.be.true | ||
| (a <= c).should.be.true | ||
|
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| class ComparatorTest(unittest.TestCase): | ||
|
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| def setUp(self): | ||
| self.comparator = version.Comparator() | ||
|
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| def testEqual(self): | ||
| (self.comparator.compare('1.2.3', '1.2.3') == 0).should.be.true | ||
|
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| def testNumericComparison(self): | ||
| (self.comparator.compare('10', '9') > 0).should.be.true | ||
| (self.comparator.compare('9', '10') < 0).should.be.true | ||
|
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| def testAlphaComparsion(self): | ||
| (self.comparator.compare('z', 'a') > 0).should.be.true | ||
| (self.comparator.compare('a', 'z') < 0).should.be.true | ||
|
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| def testAlphaNumberComparison(self): | ||
| (self.comparator.compare('a', '1') > 0).should.be.true | ||
| (self.comparator.compare('1', 'a') < 0).should.be.true | ||
|
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| def testDifferentNodeLengths(self): | ||
| (self.comparator.compare('1.2.3', '1.2') > 0).should.be.true | ||
| (self.comparator.compare('1.2', '1.2.3') < 0).should.be.true | ||
|
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| def testValueError(self): | ||
| self.assertRaises(ValueError, self.comparator.compare, '1.2.3', '') | ||
| self.assertRaises(ValueError, self.comparator.compare, '', '1.2.3') | ||
| self.assertRaises(ValueError, self.comparator.compare, '1.2.3', None) | ||
| self.assertRaises(ValueError, self.comparator.compare, None, '1.2.3') | ||
|
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| def testTypeError(self): | ||
| self.assertRaises(TypeError, self.comparator.compare, '1.2.3', 0) | ||
| self.assertRaises(TypeError, self.comparator.compare, 0, '1.2.3') | ||
|
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||
| if __name__ == '__main__': | ||
| unittest.main() |
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