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test_patiencediff.py
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# Copyright (C) 2005, 2006, 2007 Canonical Ltd # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA import os import shutil import tempfile import unittest import patiencediff from . import _patiencediff_py class TestPatienceDiffLib(unittest.TestCase): def setUp(self): super().setUp() self._unique_lcs = _patiencediff_py.unique_lcs_py self._recurse_matches = _patiencediff_py.recurse_matches_py self._PatienceSequenceMatcher = \ _patiencediff_py.PatienceSequenceMatcher_py def test_diff_unicode_string(self): a = ''.join([chr(i) for i in range(4000, 4500, 3)]) b = ''.join([chr(i) for i in range(4300, 4800, 2)]) sm = self._PatienceSequenceMatcher(None, a, b) mb = sm.get_matching_blocks() self.assertEqual(35, len(mb)) def test_unique_lcs(self): unique_lcs = self._unique_lcs self.assertEqual(unique_lcs('', ''), []) self.assertEqual(unique_lcs('', 'a'), []) self.assertEqual(unique_lcs('a', ''), []) self.assertEqual(unique_lcs('a', 'a'), [(0, 0)]) self.assertEqual(unique_lcs('a', 'b'), []) self.assertEqual(unique_lcs('ab', 'ab'), [(0, 0), (1, 1)]) self.assertEqual( unique_lcs('abcde', 'cdeab'), [(2, 0), (3, 1), (4, 2)]) self.assertEqual( unique_lcs('cdeab', 'abcde'), [(0, 2), (1, 3), (2, 4)]) self.assertEqual( unique_lcs('abXde', 'abYde'), [(0, 0), (1, 1), (3, 3), (4, 4)]) self.assertEqual(unique_lcs('acbac', 'abc'), [(2, 1)]) def test_recurse_matches(self): def test_one(a, b, matches): test_matches = [] self._recurse_matches( a, b, 0, 0, len(a), len(b), test_matches, 10) self.assertEqual(test_matches, matches) test_one(['a', '', 'b', '', 'c'], ['a', 'a', 'b', 'c', 'c'], [(0, 0), (2, 2), (4, 4)]) test_one(['a', 'c', 'b', 'a', 'c'], ['a', 'b', 'c'], [(0, 0), (2, 1), (4, 2)]) # Even though 'bc' is not unique globally, and is surrounded by # non-matching lines, we should still match, because they are locally # unique test_one('abcdbce', 'afbcgdbce', [(0, 0), (1, 2), (2, 3), (3, 5), (4, 6), (5, 7), (6, 8)]) # recurse_matches doesn't match non-unique # lines surrounded by bogus text. # The update has been done in patiencediff.SequenceMatcher instead # This is what it could be # test_one('aBccDe', 'abccde', [(0,0), (2,2), (3,3), (5,5)]) # This is what it currently gives: test_one('aBccDe', 'abccde', [(0, 0), (5, 5)]) def assertDiffBlocks(self, a, b, expected_blocks): """Check that the sequence matcher returns the correct blocks. :param a: A sequence to match :param b: Another sequence to match :param expected_blocks: The expected output, not including the final matching block (len(a), len(b), 0) """ matcher = self._PatienceSequenceMatcher(None, a, b) blocks = matcher.get_matching_blocks() last = blocks.pop() self.assertEqual((len(a), len(b), 0), last) self.assertEqual(expected_blocks, blocks) def test_matching_blocks(self): # Some basic matching tests self.assertDiffBlocks('', '', []) self.assertDiffBlocks([], [], []) self.assertDiffBlocks('abc', '', []) self.assertDiffBlocks('', 'abc', []) self.assertDiffBlocks('abcd', 'abcd', [(0, 0, 4)]) self.assertDiffBlocks('abcd', 'abce', [(0, 0, 3)]) self.assertDiffBlocks('eabc', 'abce', [(1, 0, 3)]) self.assertDiffBlocks('eabce', 'abce', [(1, 0, 4)]) self.assertDiffBlocks('abcde', 'abXde', [(0, 0, 2), (3, 3, 2)]) self.assertDiffBlocks('abcde', 'abXYZde', [(0, 0, 2), (3, 5, 2)]) self.assertDiffBlocks('abde', 'abXYZde', [(0, 0, 2), (2, 5, 2)]) # This may check too much, but it checks to see that # a copied block stays attached to the previous section, # not the later one. # difflib would tend to grab the trailing longest match # which would make the diff not look right self.assertDiffBlocks('abcdefghijklmnop', 'abcdefxydefghijklmnop', [(0, 0, 6), (6, 11, 10)]) # make sure it supports passing in lists self.assertDiffBlocks( ['hello there\n', 'world\n', 'how are you today?\n'], ['hello there\n', 'how are you today?\n'], [(0, 0, 1), (2, 1, 1)]) # non unique lines surrounded by non-matching lines # won't be found self.assertDiffBlocks('aBccDe', 'abccde', [(0, 0, 1), (5, 5, 1)]) # But they only need to be locally unique self.assertDiffBlocks( 'aBcDec', 'abcdec', [(0, 0, 1), (2, 2, 1), (4, 4, 2)]) # non unique blocks won't be matched self.assertDiffBlocks('aBcdEcdFg', 'abcdecdfg', [(0, 0, 1), (8, 8, 1)]) # but locally unique ones will self.assertDiffBlocks( 'aBcdEeXcdFg', 'abcdecdfg', [(0, 0, 1), (2, 2, 2), (5, 4, 1), (7, 5, 2), (10, 8, 1)]) self.assertDiffBlocks('abbabbXd', 'cabbabxd', [(7, 7, 1)]) self.assertDiffBlocks('abbabbbb', 'cabbabbc', []) self.assertDiffBlocks('bbbbbbbb', 'cbbbbbbc', []) def test_matching_blocks_tuples(self): # Some basic matching tests self.assertDiffBlocks([], [], []) self.assertDiffBlocks([('a',), ('b',), ('c,')], [], []) self.assertDiffBlocks([], [('a',), ('b',), ('c,')], []) self.assertDiffBlocks([('a',), ('b',), ('c,')], [('a',), ('b',), ('c,')], [(0, 0, 3)]) self.assertDiffBlocks([('a',), ('b',), ('c,')], [('a',), ('b',), ('d,')], [(0, 0, 2)]) self.assertDiffBlocks([('d',), ('b',), ('c,')], [('a',), ('b',), ('c,')], [(1, 1, 2)]) self.assertDiffBlocks([('d',), ('a',), ('b',), ('c,')], [('a',), ('b',), ('c,')], [(1, 0, 3)]) self.assertDiffBlocks([('a', 'b'), ('c', 'd'), ('e', 'f')], [('a', 'b'), ('c', 'X'), ('e', 'f')], [(0, 0, 1), (2, 2, 1)]) self.assertDiffBlocks([('a', 'b'), ('c', 'd'), ('e', 'f')], [('a', 'b'), ('c', 'dX'), ('e', 'f')], [(0, 0, 1), (2, 2, 1)]) def test_opcodes(self): def chk_ops(a, b, expected_codes): s = self._PatienceSequenceMatcher(None, a, b) self.assertEqual(expected_codes, s.get_opcodes()) chk_ops('', '', []) chk_ops([], [], []) chk_ops('abc', '', [('delete', 0, 3, 0, 0)]) chk_ops('', 'abc', [('insert', 0, 0, 0, 3)]) chk_ops('abcd', 'abcd', [('equal', 0, 4, 0, 4)]) chk_ops('abcd', 'abce', [('equal', 0, 3, 0, 3), ('replace', 3, 4, 3, 4) ]) chk_ops('eabc', 'abce', [('delete', 0, 1, 0, 0), ('equal', 1, 4, 0, 3), ('insert', 4, 4, 3, 4) ]) chk_ops('eabce', 'abce', [('delete', 0, 1, 0, 0), ('equal', 1, 5, 0, 4) ]) chk_ops('abcde', 'abXde', [('equal', 0, 2, 0, 2), ('replace', 2, 3, 2, 3), ('equal', 3, 5, 3, 5) ]) chk_ops('abcde', 'abXYZde', [('equal', 0, 2, 0, 2), ('replace', 2, 3, 2, 5), ('equal', 3, 5, 5, 7) ]) chk_ops('abde', 'abXYZde', [('equal', 0, 2, 0, 2), ('insert', 2, 2, 2, 5), ('equal', 2, 4, 5, 7) ]) chk_ops('abcdefghijklmnop', 'abcdefxydefghijklmnop', [('equal', 0, 6, 0, 6), ('insert', 6, 6, 6, 11), ('equal', 6, 16, 11, 21) ]) chk_ops( ['hello there\n', 'world\n', 'how are you today?\n'], ['hello there\n', 'how are you today?\n'], [('equal', 0, 1, 0, 1), ('delete', 1, 2, 1, 1), ('equal', 2, 3, 1, 2), ]) chk_ops('aBccDe', 'abccde', [('equal', 0, 1, 0, 1), ('replace', 1, 5, 1, 5), ('equal', 5, 6, 5, 6), ]) chk_ops('aBcDec', 'abcdec', [('equal', 0, 1, 0, 1), ('replace', 1, 2, 1, 2), ('equal', 2, 3, 2, 3), ('replace', 3, 4, 3, 4), ('equal', 4, 6, 4, 6), ]) chk_ops('aBcdEcdFg', 'abcdecdfg', [('equal', 0, 1, 0, 1), ('replace', 1, 8, 1, 8), ('equal', 8, 9, 8, 9) ]) chk_ops('aBcdEeXcdFg', 'abcdecdfg', [('equal', 0, 1, 0, 1), ('replace', 1, 2, 1, 2), ('equal', 2, 4, 2, 4), ('delete', 4, 5, 4, 4), ('equal', 5, 6, 4, 5), ('delete', 6, 7, 5, 5), ('equal', 7, 9, 5, 7), ('replace', 9, 10, 7, 8), ('equal', 10, 11, 8, 9) ]) def test_grouped_opcodes(self): def chk_ops(a, b, expected_codes, n=3): s = self._PatienceSequenceMatcher(None, a, b) self.assertEqual(expected_codes, list(s.get_grouped_opcodes(n))) chk_ops('', '', []) chk_ops([], [], []) chk_ops('abc', '', [[('delete', 0, 3, 0, 0)]]) chk_ops('', 'abc', [[('insert', 0, 0, 0, 3)]]) chk_ops('abcd', 'abcd', []) chk_ops('abcd', 'abce', [[('equal', 0, 3, 0, 3), ('replace', 3, 4, 3, 4) ]]) chk_ops('eabc', 'abce', [[('delete', 0, 1, 0, 0), ('equal', 1, 4, 0, 3), ('insert', 4, 4, 3, 4)]]) chk_ops('abcdefghijklmnop', 'abcdefxydefghijklmnop', [[('equal', 3, 6, 3, 6), ('insert', 6, 6, 6, 11), ('equal', 6, 9, 11, 14) ]]) chk_ops('abcdefghijklmnop', 'abcdefxydefghijklmnop', [[('equal', 2, 6, 2, 6), ('insert', 6, 6, 6, 11), ('equal', 6, 10, 11, 15) ]], 4) chk_ops('Xabcdef', 'abcdef', [[('delete', 0, 1, 0, 0), ('equal', 1, 4, 0, 3) ]]) chk_ops('abcdef', 'abcdefX', [[('equal', 3, 6, 3, 6), ('insert', 6, 6, 6, 7) ]]) def test_multiple_ranges(self): # There was an earlier bug where we used a bad set of ranges, # this triggers that specific bug, to make sure it doesn't regress self.assertDiffBlocks('abcdefghijklmnop', 'abcXghiYZQRSTUVWXYZijklmnop', [(0, 0, 3), (6, 4, 3), (9, 20, 7)]) self.assertDiffBlocks('ABCd efghIjk L', 'AxyzBCn mo pqrstuvwI1 2 L', [(0, 0, 1), (1, 4, 2), (9, 19, 1), (12, 23, 3)]) # These are rot13 code snippets. self.assertDiffBlocks('''\ trg nqqrq jura lbh nqq n svyr va gur qverpgbel. """ gnxrf_netf = ['svyr*'] gnxrf_bcgvbaf = ['ab-erphefr'] qrs eha(frys, svyr_yvfg, ab_erphefr=Snyfr): sebz omeyvo.nqq vzcbeg fzneg_nqq, nqq_ercbegre_cevag, nqq_ercbegre_ahyy vs vf_dhvrg(): ercbegre = nqq_ercbegre_ahyy ryfr: ercbegre = nqq_ercbegre_cevag fzneg_nqq(svyr_yvfg, abg ab_erphefr, ercbegre) pynff pzq_zxqve(Pbzznaq): '''.splitlines(True), '''\ trg nqqrq jura lbh nqq n svyr va gur qverpgbel. --qel-eha jvyy fubj juvpu svyrf jbhyq or nqqrq, ohg abg npghnyyl nqq gurz. """ gnxrf_netf = ['svyr*'] gnxrf_bcgvbaf = ['ab-erphefr', 'qel-eha'] qrs eha(frys, svyr_yvfg, ab_erphefr=Snyfr, qel_eha=Snyfr): vzcbeg omeyvo.nqq vs qel_eha: vs vf_dhvrg(): # Guvf vf cbvagyrff, ohg V'q engure abg envfr na reebe npgvba = omeyvo.nqq.nqq_npgvba_ahyy ryfr: npgvba = omeyvo.nqq.nqq_npgvba_cevag ryvs vf_dhvrg(): npgvba = omeyvo.nqq.nqq_npgvba_nqq ryfr: npgvba = omeyvo.nqq.nqq_npgvba_nqq_naq_cevag omeyvo.nqq.fzneg_nqq(svyr_yvfg, abg ab_erphefr, npgvba) pynff pzq_zxqve(Pbzznaq): '''.splitlines(True), [(0, 0, 1), (1, 4, 2), (9, 19, 1), (12, 23, 3)]) def test_patience_unified_diff(self): txt_a = ['hello there\n', 'world\n', 'how are you today?\n'] txt_b = ['hello there\n', 'how are you today?\n'] unified_diff = patiencediff.unified_diff psm = self._PatienceSequenceMatcher self.assertEqual(['--- \n', '+++ \n', '@@ -1,3 +1,2 @@\n', ' hello there\n', '-world\n', ' how are you today?\n' ], list(unified_diff( txt_a, txt_b, sequencematcher=psm))) txt_a = [x+'\n' for x in 'abcdefghijklmnop'] txt_b = [x+'\n' for x in 'abcdefxydefghijklmnop'] # This is the result with LongestCommonSubstring matching self.assertEqual(['--- \n', '+++ \n', '@@ -1,6 +1,11 @@\n', ' a\n', ' b\n', ' c\n', '+d\n', '+e\n', '+f\n', '+x\n', '+y\n', ' d\n', ' e\n', ' f\n'], list(unified_diff(txt_a, txt_b))) # And the patience diff self.assertEqual(['--- \n', '+++ \n', '@@ -4,6 +4,11 @@\n', ' d\n', ' e\n', ' f\n', '+x\n', '+y\n', '+d\n', '+e\n', '+f\n', ' g\n', ' h\n', ' i\n', ], list(unified_diff( txt_a, txt_b, sequencematcher=psm))) def test_patience_unified_diff_with_dates(self): txt_a = ['hello there\n', 'world\n', 'how are you today?\n'] txt_b = ['hello there\n', 'how are you today?\n'] unified_diff = patiencediff.unified_diff psm = self._PatienceSequenceMatcher self.assertEqual(['--- a\t2008-08-08\n', '+++ b\t2008-09-09\n', '@@ -1,3 +1,2 @@\n', ' hello there\n', '-world\n', ' how are you today?\n' ], list(unified_diff( txt_a, txt_b, fromfile='a', tofile='b', fromfiledate='2008-08-08', tofiledate='2008-09-09', sequencematcher=psm))) class TestPatienceDiffLib_c(TestPatienceDiffLib): def setUp(self): super().setUp() try: from . import _patiencediff_c except ImportError: self.skipTest('C extension not built') self._unique_lcs = _patiencediff_c.unique_lcs_c self._recurse_matches = _patiencediff_c.recurse_matches_c self._PatienceSequenceMatcher = \ _patiencediff_c.PatienceSequenceMatcher_c def test_unhashable(self): """We should get a proper exception here.""" # We need to be able to hash items in the sequence, lists are # unhashable, and thus cannot be diffed self.assertRaises( TypeError, self._PatienceSequenceMatcher, None, [[]], []) self.assertRaises( TypeError, self._PatienceSequenceMatcher, None, ['valid', []], []) self.assertRaises( TypeError, self._PatienceSequenceMatcher, None, ['valid'], [[]]) self.assertRaises( TypeError, self._PatienceSequenceMatcher, None, ['valid'], ['valid', []]) class TestPatienceDiffLibFiles(unittest.TestCase): def setUp(self): super().setUp() self._PatienceSequenceMatcher = \ _patiencediff_py.PatienceSequenceMatcher_py self.test_dir = tempfile.mkdtemp() self.addCleanup(lambda: shutil.rmtree(self.test_dir)) def test_patience_unified_diff_files(self): txt_a = [b'hello there\n', b'world\n', b'how are you today?\n'] txt_b = [b'hello there\n', b'how are you today?\n'] with open(os.path.join(self.test_dir, 'a1'), 'wb') as f: f.writelines(txt_a) with open(os.path.join(self.test_dir, 'b1'), 'wb') as f: f.writelines(txt_b) unified_diff_files = patiencediff.unified_diff_files psm = self._PatienceSequenceMatcher old_pwd = os.getcwd() os.chdir(self.test_dir) try: self.assertEqual(['--- a1\n', '+++ b1\n', '@@ -1,3 +1,2 @@\n', ' hello there\n', '-world\n', ' how are you today?\n', ], list(unified_diff_files( 'a1', 'b1', sequencematcher=psm))) finally: os.chdir(old_pwd) txt_a = [x+'\n' for x in 'abcdefghijklmnop'] txt_b = [x+'\n' for x in 'abcdefxydefghijklmnop'] with open(os.path.join(self.test_dir, 'a2'), 'w') as f: f.writelines(txt_a) with open(os.path.join(self.test_dir, 'b2'), 'w') as f: f.writelines(txt_b) # This is the result with LongestCommonSubstring matching os.chdir(self.test_dir) try: self.assertEqual(['--- a2\n', '+++ b2\n', '@@ -1,6 +1,11 @@\n', ' a\n', ' b\n', ' c\n', '+d\n', '+e\n', '+f\n', '+x\n', '+y\n', ' d\n', ' e\n', ' f\n'], list(unified_diff_files('a2', 'b2'))) # And the patience diff self.assertEqual(['--- a2\n', '+++ b2\n', '@@ -4,6 +4,11 @@\n', ' d\n', ' e\n', ' f\n', '+x\n', '+y\n', '+d\n', '+e\n', '+f\n', ' g\n', ' h\n', ' i\n'], list(unified_diff_files('a2', 'b2', sequencematcher=psm))) finally: os.chdir(old_pwd) class TestPatienceDiffLibFiles_c(TestPatienceDiffLibFiles): def setUp(self): super().setUp() try: from . import _patiencediff_c except ImportError: self.skipTest('C extension not built') self._PatienceSequenceMatcher = \ _patiencediff_c.PatienceSequenceMatcher_c class TestUsingCompiledIfAvailable(unittest.TestCase): def test_PatienceSequenceMatcher(self): try: from ._patiencediff_c import PatienceSequenceMatcher_c except ImportError: from ._patiencediff_py import PatienceSequenceMatcher_py self.assertIs(PatienceSequenceMatcher_py, patiencediff.PatienceSequenceMatcher) else: self.assertIs(PatienceSequenceMatcher_c, patiencediff.PatienceSequenceMatcher) def test_unique_lcs(self): try: from ._patiencediff_c import unique_lcs_c except ImportError: from ._patiencediff_py import unique_lcs_py self.assertIs(unique_lcs_py, patiencediff.unique_lcs) else: self.assertIs(unique_lcs_c, patiencediff.unique_lcs) def test_recurse_matches(self): try: from ._patiencediff_c import recurse_matches_c except ImportError: from ._patiencediff_py import recurse_matches_py self.assertIs(recurse_matches_py, patiencediff.recurse_matches) else: self.assertIs(recurse_matches_c, patiencediff.recurse_matches)