| import difflib |
| from test.support import run_unittest, findfile |
| import unittest |
| import doctest |
| import sys |
| |
| |
| class TestWithAscii(unittest.TestCase): |
| def test_one_insert(self): |
| sm = difflib.SequenceMatcher(None, 'b' * 100, 'a' + 'b' * 100) |
| self.assertAlmostEqual(sm.ratio(), 0.995, places=3) |
| self.assertEqual(list(sm.get_opcodes()), |
| [ ('insert', 0, 0, 0, 1), |
| ('equal', 0, 100, 1, 101)]) |
| self.assertEqual(sm.bpopular, set()) |
| sm = difflib.SequenceMatcher(None, 'b' * 100, 'b' * 50 + 'a' + 'b' * 50) |
| self.assertAlmostEqual(sm.ratio(), 0.995, places=3) |
| self.assertEqual(list(sm.get_opcodes()), |
| [ ('equal', 0, 50, 0, 50), |
| ('insert', 50, 50, 50, 51), |
| ('equal', 50, 100, 51, 101)]) |
| self.assertEqual(sm.bpopular, set()) |
| |
| def test_one_delete(self): |
| sm = difflib.SequenceMatcher(None, 'a' * 40 + 'c' + 'b' * 40, 'a' * 40 + 'b' * 40) |
| self.assertAlmostEqual(sm.ratio(), 0.994, places=3) |
| self.assertEqual(list(sm.get_opcodes()), |
| [ ('equal', 0, 40, 0, 40), |
| ('delete', 40, 41, 40, 40), |
| ('equal', 41, 81, 40, 80)]) |
| |
| def test_bjunk(self): |
| sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ', |
| a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40) |
| self.assertEqual(sm.bjunk, set()) |
| |
| sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ', |
| a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20) |
| self.assertEqual(sm.bjunk, {' '}) |
| |
| sm = difflib.SequenceMatcher(isjunk=lambda x: x in [' ', 'b'], |
| a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20) |
| self.assertEqual(sm.bjunk, {' ', 'b'}) |
| |
| |
| class TestAutojunk(unittest.TestCase): |
| """Tests for the autojunk parameter added in 2.7""" |
| def test_one_insert_homogenous_sequence(self): |
| # By default autojunk=True and the heuristic kicks in for a sequence |
| # of length 200+ |
| seq1 = 'b' * 200 |
| seq2 = 'a' + 'b' * 200 |
| |
| sm = difflib.SequenceMatcher(None, seq1, seq2) |
| self.assertAlmostEqual(sm.ratio(), 0, places=3) |
| self.assertEqual(sm.bpopular, {'b'}) |
| |
| # Now turn the heuristic off |
| sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False) |
| self.assertAlmostEqual(sm.ratio(), 0.9975, places=3) |
| self.assertEqual(sm.bpopular, set()) |
| |
| |
| class TestSFbugs(unittest.TestCase): |
| def test_ratio_for_null_seqn(self): |
| # Check clearing of SF bug 763023 |
| s = difflib.SequenceMatcher(None, [], []) |
| self.assertEqual(s.ratio(), 1) |
| self.assertEqual(s.quick_ratio(), 1) |
| self.assertEqual(s.real_quick_ratio(), 1) |
| |
| def test_comparing_empty_lists(self): |
| # Check fix for bug #979794 |
| group_gen = difflib.SequenceMatcher(None, [], []).get_grouped_opcodes() |
| self.assertRaises(StopIteration, next, group_gen) |
| diff_gen = difflib.unified_diff([], []) |
| self.assertRaises(StopIteration, next, diff_gen) |
| |
| def test_matching_blocks_cache(self): |
| # Issue #21635 |
| s = difflib.SequenceMatcher(None, "abxcd", "abcd") |
| first = s.get_matching_blocks() |
| second = s.get_matching_blocks() |
| self.assertEqual(second[0].size, 2) |
| self.assertEqual(second[1].size, 2) |
| self.assertEqual(second[2].size, 0) |
| |
| def test_added_tab_hint(self): |
| # Check fix for bug #1488943 |
| diff = list(difflib.Differ().compare(["\tI am a buggy"],["\t\tI am a bug"])) |
| self.assertEqual("- \tI am a buggy", diff[0]) |
| self.assertEqual("? --\n", diff[1]) |
| self.assertEqual("+ \t\tI am a bug", diff[2]) |
| self.assertEqual("? +\n", diff[3]) |
| |
| patch914575_from1 = """ |
| 1. Beautiful is beTTer than ugly. |
| 2. Explicit is better than implicit. |
| 3. Simple is better than complex. |
| 4. Complex is better than complicated. |
| """ |
| |
| patch914575_to1 = """ |
| 1. Beautiful is better than ugly. |
| 3. Simple is better than complex. |
| 4. Complicated is better than complex. |
| 5. Flat is better than nested. |
| """ |
| |
| patch914575_from2 = """ |
| \t\tLine 1: preceeded by from:[tt] to:[ssss] |
| \t\tLine 2: preceeded by from:[sstt] to:[sssst] |
| \t \tLine 3: preceeded by from:[sstst] to:[ssssss] |
| Line 4: \thas from:[sst] to:[sss] after : |
| Line 5: has from:[t] to:[ss] at end\t |
| """ |
| |
| patch914575_to2 = """ |
| Line 1: preceeded by from:[tt] to:[ssss] |
| \tLine 2: preceeded by from:[sstt] to:[sssst] |
| Line 3: preceeded by from:[sstst] to:[ssssss] |
| Line 4: has from:[sst] to:[sss] after : |
| Line 5: has from:[t] to:[ss] at end |
| """ |
| |
| patch914575_from3 = """line 0 |
| 1234567890123456789012345689012345 |
| line 1 |
| line 2 |
| line 3 |
| line 4 changed |
| line 5 changed |
| line 6 changed |
| line 7 |
| line 8 subtracted |
| line 9 |
| 1234567890123456789012345689012345 |
| short line |
| just fits in!! |
| just fits in two lines yup!! |
| the end""" |
| |
| patch914575_to3 = """line 0 |
| 1234567890123456789012345689012345 |
| line 1 |
| line 2 added |
| line 3 |
| line 4 chanGEd |
| line 5a chanGed |
| line 6a changEd |
| line 7 |
| line 8 |
| line 9 |
| 1234567890 |
| another long line that needs to be wrapped |
| just fitS in!! |
| just fits in two lineS yup!! |
| the end""" |
| |
| class TestSFpatches(unittest.TestCase): |
| |
| def test_html_diff(self): |
| # Check SF patch 914575 for generating HTML differences |
| f1a = ((patch914575_from1 + '123\n'*10)*3) |
| t1a = (patch914575_to1 + '123\n'*10)*3 |
| f1b = '456\n'*10 + f1a |
| t1b = '456\n'*10 + t1a |
| f1a = f1a.splitlines() |
| t1a = t1a.splitlines() |
| f1b = f1b.splitlines() |
| t1b = t1b.splitlines() |
| f2 = patch914575_from2.splitlines() |
| t2 = patch914575_to2.splitlines() |
| f3 = patch914575_from3 |
| t3 = patch914575_to3 |
| i = difflib.HtmlDiff() |
| j = difflib.HtmlDiff(tabsize=2) |
| k = difflib.HtmlDiff(wrapcolumn=14) |
| |
| full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5) |
| tables = '\n'.join( |
| [ |
| '<h2>Context (first diff within numlines=5(default))</h2>', |
| i.make_table(f1a,t1a,'from','to',context=True), |
| '<h2>Context (first diff after numlines=5(default))</h2>', |
| i.make_table(f1b,t1b,'from','to',context=True), |
| '<h2>Context (numlines=6)</h2>', |
| i.make_table(f1a,t1a,'from','to',context=True,numlines=6), |
| '<h2>Context (numlines=0)</h2>', |
| i.make_table(f1a,t1a,'from','to',context=True,numlines=0), |
| '<h2>Same Context</h2>', |
| i.make_table(f1a,f1a,'from','to',context=True), |
| '<h2>Same Full</h2>', |
| i.make_table(f1a,f1a,'from','to',context=False), |
| '<h2>Empty Context</h2>', |
| i.make_table([],[],'from','to',context=True), |
| '<h2>Empty Full</h2>', |
| i.make_table([],[],'from','to',context=False), |
| '<h2>tabsize=2</h2>', |
| j.make_table(f2,t2), |
| '<h2>tabsize=default</h2>', |
| i.make_table(f2,t2), |
| '<h2>Context (wrapcolumn=14,numlines=0)</h2>', |
| k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0), |
| '<h2>wrapcolumn=14,splitlines()</h2>', |
| k.make_table(f3.splitlines(),t3.splitlines()), |
| '<h2>wrapcolumn=14,splitlines(True)</h2>', |
| k.make_table(f3.splitlines(True),t3.splitlines(True)), |
| ]) |
| actual = full.replace('</body>','\n%s\n</body>' % tables) |
| |
| # temporarily uncomment next two lines to baseline this test |
| #with open('test_difflib_expect.html','w') as fp: |
| # fp.write(actual) |
| |
| with open(findfile('test_difflib_expect.html')) as fp: |
| self.assertEqual(actual, fp.read()) |
| |
| def test_recursion_limit(self): |
| # Check if the problem described in patch #1413711 exists. |
| limit = sys.getrecursionlimit() |
| old = [(i%2 and "K:%d" or "V:A:%d") % i for i in range(limit*2)] |
| new = [(i%2 and "K:%d" or "V:B:%d") % i for i in range(limit*2)] |
| difflib.SequenceMatcher(None, old, new).get_opcodes() |
| |
| |
| class TestOutputFormat(unittest.TestCase): |
| def test_tab_delimiter(self): |
| args = ['one', 'two', 'Original', 'Current', |
| '2005-01-26 23:30:50', '2010-04-02 10:20:52'] |
| ud = difflib.unified_diff(*args, lineterm='') |
| self.assertEqual(list(ud)[0:2], [ |
| "--- Original\t2005-01-26 23:30:50", |
| "+++ Current\t2010-04-02 10:20:52"]) |
| cd = difflib.context_diff(*args, lineterm='') |
| self.assertEqual(list(cd)[0:2], [ |
| "*** Original\t2005-01-26 23:30:50", |
| "--- Current\t2010-04-02 10:20:52"]) |
| |
| def test_no_trailing_tab_on_empty_filedate(self): |
| args = ['one', 'two', 'Original', 'Current'] |
| ud = difflib.unified_diff(*args, lineterm='') |
| self.assertEqual(list(ud)[0:2], ["--- Original", "+++ Current"]) |
| |
| cd = difflib.context_diff(*args, lineterm='') |
| self.assertEqual(list(cd)[0:2], ["*** Original", "--- Current"]) |
| |
| def test_range_format_unified(self): |
| # Per the diff spec at http://www.unix.org/single_unix_specification/ |
| spec = '''\ |
| Each <range> field shall be of the form: |
| %1d", <beginning line number> if the range contains exactly one line, |
| and: |
| "%1d,%1d", <beginning line number>, <number of lines> otherwise. |
| If a range is empty, its beginning line number shall be the number of |
| the line just before the range, or 0 if the empty range starts the file. |
| ''' |
| fmt = difflib._format_range_unified |
| self.assertEqual(fmt(3,3), '3,0') |
| self.assertEqual(fmt(3,4), '4') |
| self.assertEqual(fmt(3,5), '4,2') |
| self.assertEqual(fmt(3,6), '4,3') |
| self.assertEqual(fmt(0,0), '0,0') |
| |
| def test_range_format_context(self): |
| # Per the diff spec at http://www.unix.org/single_unix_specification/ |
| spec = '''\ |
| The range of lines in file1 shall be written in the following format |
| if the range contains two or more lines: |
| "*** %d,%d ****\n", <beginning line number>, <ending line number> |
| and the following format otherwise: |
| "*** %d ****\n", <ending line number> |
| The ending line number of an empty range shall be the number of the preceding line, |
| or 0 if the range is at the start of the file. |
| |
| Next, the range of lines in file2 shall be written in the following format |
| if the range contains two or more lines: |
| "--- %d,%d ----\n", <beginning line number>, <ending line number> |
| and the following format otherwise: |
| "--- %d ----\n", <ending line number> |
| ''' |
| fmt = difflib._format_range_context |
| self.assertEqual(fmt(3,3), '3') |
| self.assertEqual(fmt(3,4), '4') |
| self.assertEqual(fmt(3,5), '4,5') |
| self.assertEqual(fmt(3,6), '4,6') |
| self.assertEqual(fmt(0,0), '0') |
| |
| |
| def test_main(): |
| difflib.HtmlDiff._default_prefix = 0 |
| Doctests = doctest.DocTestSuite(difflib) |
| run_unittest( |
| TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs, |
| TestOutputFormat, Doctests) |
| |
| if __name__ == '__main__': |
| test_main() |