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bpo-40480 "fnmatch" exponential execution time #19908

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Merged
merged 5 commits into from
May 6, 2020
Merged

bpo-40480 "fnmatch" exponential execution time #19908

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b7c0e5e
bpo-40480 "fnmatch" exponential execution time
tim-one May 4, 2020
a158f62
trivial edits
tim-one May 4, 2020
1d61b7f
📜🤖 Added by blurb_it.
blurb-it[bot] May 4, 2020
fbb7048
Moved the block of new translate() tests into the right
tim-one May 4, 2020
86d1d0d
Removed useless code from an earlier version.
tim-one May 4, 2020
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Moved the block of new translate() tests into the right 
test function.
  • Loading branch information
@tim-one
tim-one committed May 4, 2020
commit fbb7048393041e4a691cb87572212ea8257dd745
20 changes: 10 additions & 10 deletions Lib/test/test_fnmatch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,16 +44,6 @@ def test_fnmatch(self):
check('foo\nbar\n', 'foo*')
check('\nfoo', 'foo*', False)
check('\n', '*')
# from the docs
self.assertEqual(translate('*.txt'), r'(?s:.*\.txt)\Z')
# squash consecutive stars
self.assertEqual(translate('*********'), r'(?s:.*)\Z')
self.assertEqual(translate('A*********'), r'(?s:A.*)\Z')
self.assertEqual(translate('*********A'), r'(?s:.*A)\Z')
self.assertEqual(translate('A*********?[?]?'), r'(?s:A.*.[?].)\Z')
# fancy translation to prevent exponential-time match failure
self.assertEqual(translate('**a*a****a'),
r'(?s:(?=(?P<g1>.*?a))(?P=g1)(?=(?P<g2>.*?a))(?P=g2).*a)\Z')

def test_slow_fnmatch(self):
check = self.check_match
Expand Down Expand Up @@ -124,6 +114,16 @@ def test_translate(self):
self.assertEqual(translate('[!x]'), r'(?s:[^x])\Z')
self.assertEqual(translate('[^x]'), r'(?s:[\^x])\Z')
self.assertEqual(translate('[x'), r'(?s:\[x)\Z')
# from the docs
self.assertEqual(translate('*.txt'), r'(?s:.*\.txt)\Z')
# squash consecutive stars
self.assertEqual(translate('*********'), r'(?s:.*)\Z')
self.assertEqual(translate('A*********'), r'(?s:A.*)\Z')
self.assertEqual(translate('*********A'), r'(?s:.*A)\Z')
self.assertEqual(translate('A*********?[?]?'), r'(?s:A.*.[?].)\Z')
# fancy translation to prevent exponential-time match failure
self.assertEqual(translate('**a*a****a'),
r'(?s:(?=(?P<g1>.*?a))(?P=g1)(?=(?P<g2>.*?a))(?P=g2).*a)\Z')


class FilterTestCase(unittest.TestCase):
Expand Down
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