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bpo-40394 - difflib.SequenceMatched.find_longest_match default args (GH-19742)

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* bpo-40394 - difflib.SequenceMatched.find_longest_match default args

Added default args to find_longest_match, as well as related tests.
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lrjball 2020-04-30 04:42:45 +01:00 • committed by GitHub
parent 6900f16d22
commit 3209cbd99b
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5 changed files with 61 additions and 4 deletions
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48
Lib/test/test_difflib.py
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@ -501,12 +501,58 @@ class TestJunkAPIs(unittest.TestCase):
for char in ['a', '#', '\n', '\f', '\r', '\v']:
self.assertFalse(difflib.IS_CHARACTER_JUNK(char), repr(char))
class TestFindLongest(unittest.TestCase):
def longer_match_exists(self, a, b, n):
return any(b_part in a for b_part in
[b[i:i + n + 1] for i in range(0, len(b) - n - 1)])
def test_default_args(self):
a = 'foo bar'
b = 'foo baz bar'
sm = difflib.SequenceMatcher(a=a, b=b)
match = sm.find_longest_match()
self.assertEqual(match.a, 0)
self.assertEqual(match.b, 0)
self.assertEqual(match.size, 6)
self.assertEqual(a[match.a: match.a + match.size],
b[match.b: match.b + match.size])
self.assertFalse(self.longer_match_exists(a, b, match.size))
match = sm.find_longest_match(alo=2, blo=4)
self.assertEqual(match.a, 3)
self.assertEqual(match.b, 7)
self.assertEqual(match.size, 4)
self.assertEqual(a[match.a: match.a + match.size],
b[match.b: match.b + match.size])
self.assertFalse(self.longer_match_exists(a[2:], b[4:], match.size))
match = sm.find_longest_match(bhi=5, blo=1)
self.assertEqual(match.a, 1)
self.assertEqual(match.b, 1)
self.assertEqual(match.size, 4)
self.assertEqual(a[match.a: match.a + match.size],
b[match.b: match.b + match.size])
self.assertFalse(self.longer_match_exists(a, b[1:5], match.size))
def test_longest_match_with_popular_chars(self):
a = 'dabcd'
b = 'd'*100 + 'abc' + 'd'*100 # length over 200 so popular used
sm = difflib.SequenceMatcher(a=a, b=b)
match = sm.find_longest_match(0, len(a), 0, len(b))
self.assertEqual(match.a, 0)
self.assertEqual(match.b, 99)
self.assertEqual(match.size, 5)
self.assertEqual(a[match.a: match.a + match.size],
b[match.b: match.b + match.size])
self.assertFalse(self.longer_match_exists(a, b, match.size))
def test_main():
difflib.HtmlDiff._default_prefix = 0
Doctests = doctest.DocTestSuite(difflib)
run_unittest(
TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
TestOutputFormat, TestBytes, TestJunkAPIs, Doctests)
TestOutputFormat, TestBytes, TestJunkAPIs, TestFindLongest, Doctests)
if __name__ == '__main__':
test_main()