513 lines
20 KiB
Python
513 lines
20 KiB
Python
import difflib
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from test.support import run_unittest, findfile
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import unittest
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import doctest
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import sys
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class TestWithAscii(unittest.TestCase):
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def test_one_insert(self):
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sm = difflib.SequenceMatcher(None, 'b' * 100, 'a' + 'b' * 100)
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self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
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self.assertEqual(list(sm.get_opcodes()),
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[ ('insert', 0, 0, 0, 1),
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('equal', 0, 100, 1, 101)])
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self.assertEqual(sm.bpopular, set())
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sm = difflib.SequenceMatcher(None, 'b' * 100, 'b' * 50 + 'a' + 'b' * 50)
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self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
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self.assertEqual(list(sm.get_opcodes()),
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[ ('equal', 0, 50, 0, 50),
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('insert', 50, 50, 50, 51),
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('equal', 50, 100, 51, 101)])
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self.assertEqual(sm.bpopular, set())
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def test_one_delete(self):
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sm = difflib.SequenceMatcher(None, 'a' * 40 + 'c' + 'b' * 40, 'a' * 40 + 'b' * 40)
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self.assertAlmostEqual(sm.ratio(), 0.994, places=3)
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self.assertEqual(list(sm.get_opcodes()),
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[ ('equal', 0, 40, 0, 40),
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('delete', 40, 41, 40, 40),
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('equal', 41, 81, 40, 80)])
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def test_bjunk(self):
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sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
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a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40)
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self.assertEqual(sm.bjunk, set())
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sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
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a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
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self.assertEqual(sm.bjunk, {' '})
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sm = difflib.SequenceMatcher(isjunk=lambda x: x in [' ', 'b'],
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a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
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self.assertEqual(sm.bjunk, {' ', 'b'})
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class TestAutojunk(unittest.TestCase):
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"""Tests for the autojunk parameter added in 2.7"""
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def test_one_insert_homogenous_sequence(self):
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# By default autojunk=True and the heuristic kicks in for a sequence
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# of length 200+
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seq1 = 'b' * 200
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seq2 = 'a' + 'b' * 200
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sm = difflib.SequenceMatcher(None, seq1, seq2)
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self.assertAlmostEqual(sm.ratio(), 0, places=3)
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self.assertEqual(sm.bpopular, {'b'})
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# Now turn the heuristic off
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sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
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self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
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self.assertEqual(sm.bpopular, set())
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class TestSFbugs(unittest.TestCase):
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def test_ratio_for_null_seqn(self):
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# Check clearing of SF bug 763023
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s = difflib.SequenceMatcher(None, [], [])
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self.assertEqual(s.ratio(), 1)
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self.assertEqual(s.quick_ratio(), 1)
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self.assertEqual(s.real_quick_ratio(), 1)
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def test_comparing_empty_lists(self):
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# Check fix for bug #979794
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group_gen = difflib.SequenceMatcher(None, [], []).get_grouped_opcodes()
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self.assertRaises(StopIteration, next, group_gen)
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diff_gen = difflib.unified_diff([], [])
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self.assertRaises(StopIteration, next, diff_gen)
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def test_matching_blocks_cache(self):
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# Issue #21635
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s = difflib.SequenceMatcher(None, "abxcd", "abcd")
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first = s.get_matching_blocks()
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second = s.get_matching_blocks()
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self.assertEqual(second[0].size, 2)
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self.assertEqual(second[1].size, 2)
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self.assertEqual(second[2].size, 0)
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def test_added_tab_hint(self):
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# Check fix for bug #1488943
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diff = list(difflib.Differ().compare(["\tI am a buggy"],["\t\tI am a bug"]))
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self.assertEqual("- \tI am a buggy", diff[0])
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self.assertEqual("? \t --\n", diff[1])
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self.assertEqual("+ \t\tI am a bug", diff[2])
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self.assertEqual("? +\n", diff[3])
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def test_hint_indented_properly_with_tabs(self):
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diff = list(difflib.Differ().compare(["\t \t \t^"], ["\t \t \t^\n"]))
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self.assertEqual("- \t \t \t^", diff[0])
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self.assertEqual("+ \t \t \t^\n", diff[1])
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self.assertEqual("? \t \t \t +\n", diff[2])
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def test_mdiff_catch_stop_iteration(self):
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# Issue #33224
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self.assertEqual(
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list(difflib._mdiff(["2"], ["3"], 1)),
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[((1, '\x00-2\x01'), (1, '\x00+3\x01'), True)],
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)
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patch914575_from1 = """
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1. Beautiful is beTTer than ugly.
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2. Explicit is better than implicit.
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3. Simple is better than complex.
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4. Complex is better than complicated.
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"""
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patch914575_to1 = """
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1. Beautiful is better than ugly.
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3. Simple is better than complex.
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4. Complicated is better than complex.
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5. Flat is better than nested.
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"""
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patch914575_nonascii_from1 = """
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1. Beautiful is beTTer than ugly.
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2. Explicit is better than ımplıcıt.
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3. Simple is better than complex.
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4. Complex is better than complicated.
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"""
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patch914575_nonascii_to1 = """
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1. Beautiful is better than ügly.
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3. Sımple is better than complex.
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4. Complicated is better than cömplex.
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5. Flat is better than nested.
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"""
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patch914575_from2 = """
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\t\tLine 1: preceded by from:[tt] to:[ssss]
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\t\tLine 2: preceded by from:[sstt] to:[sssst]
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\t \tLine 3: preceded by from:[sstst] to:[ssssss]
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Line 4: \thas from:[sst] to:[sss] after :
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Line 5: has from:[t] to:[ss] at end\t
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"""
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patch914575_to2 = """
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Line 1: preceded by from:[tt] to:[ssss]
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\tLine 2: preceded by from:[sstt] to:[sssst]
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Line 3: preceded by from:[sstst] to:[ssssss]
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Line 4: has from:[sst] to:[sss] after :
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Line 5: has from:[t] to:[ss] at end
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"""
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patch914575_from3 = """line 0
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1234567890123456789012345689012345
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line 1
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line 2
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line 3
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line 4 changed
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line 5 changed
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line 6 changed
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line 7
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line 8 subtracted
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line 9
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1234567890123456789012345689012345
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short line
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just fits in!!
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just fits in two lines yup!!
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the end"""
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patch914575_to3 = """line 0
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1234567890123456789012345689012345
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line 1
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line 2 added
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line 3
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line 4 chanGEd
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line 5a chanGed
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line 6a changEd
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line 7
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line 8
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line 9
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1234567890
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another long line that needs to be wrapped
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just fitS in!!
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just fits in two lineS yup!!
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the end"""
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class TestSFpatches(unittest.TestCase):
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def test_html_diff(self):
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# Check SF patch 914575 for generating HTML differences
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f1a = ((patch914575_from1 + '123\n'*10)*3)
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t1a = (patch914575_to1 + '123\n'*10)*3
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f1b = '456\n'*10 + f1a
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t1b = '456\n'*10 + t1a
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f1a = f1a.splitlines()
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t1a = t1a.splitlines()
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f1b = f1b.splitlines()
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t1b = t1b.splitlines()
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f2 = patch914575_from2.splitlines()
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t2 = patch914575_to2.splitlines()
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f3 = patch914575_from3
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t3 = patch914575_to3
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i = difflib.HtmlDiff()
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j = difflib.HtmlDiff(tabsize=2)
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k = difflib.HtmlDiff(wrapcolumn=14)
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full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
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tables = '\n'.join(
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[
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'<h2>Context (first diff within numlines=5(default))</h2>',
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i.make_table(f1a,t1a,'from','to',context=True),
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'<h2>Context (first diff after numlines=5(default))</h2>',
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i.make_table(f1b,t1b,'from','to',context=True),
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'<h2>Context (numlines=6)</h2>',
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i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
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'<h2>Context (numlines=0)</h2>',
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i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
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'<h2>Same Context</h2>',
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i.make_table(f1a,f1a,'from','to',context=True),
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'<h2>Same Full</h2>',
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i.make_table(f1a,f1a,'from','to',context=False),
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'<h2>Empty Context</h2>',
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i.make_table([],[],'from','to',context=True),
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'<h2>Empty Full</h2>',
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i.make_table([],[],'from','to',context=False),
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'<h2>tabsize=2</h2>',
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j.make_table(f2,t2),
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'<h2>tabsize=default</h2>',
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i.make_table(f2,t2),
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'<h2>Context (wrapcolumn=14,numlines=0)</h2>',
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k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
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'<h2>wrapcolumn=14,splitlines()</h2>',
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k.make_table(f3.splitlines(),t3.splitlines()),
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'<h2>wrapcolumn=14,splitlines(True)</h2>',
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k.make_table(f3.splitlines(True),t3.splitlines(True)),
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])
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actual = full.replace('</body>','\n%s\n</body>' % tables)
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# temporarily uncomment next two lines to baseline this test
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#with open('test_difflib_expect.html','w') as fp:
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# fp.write(actual)
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with open(findfile('test_difflib_expect.html')) as fp:
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self.assertEqual(actual, fp.read())
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def test_recursion_limit(self):
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# Check if the problem described in patch #1413711 exists.
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limit = sys.getrecursionlimit()
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old = [(i%2 and "K:%d" or "V:A:%d") % i for i in range(limit*2)]
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new = [(i%2 and "K:%d" or "V:B:%d") % i for i in range(limit*2)]
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difflib.SequenceMatcher(None, old, new).get_opcodes()
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def test_make_file_default_charset(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_from1.splitlines(),
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patch914575_to1.splitlines())
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self.assertIn('content="text/html; charset=utf-8"', output)
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def test_make_file_iso88591_charset(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_from1.splitlines(),
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patch914575_to1.splitlines(),
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charset='iso-8859-1')
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self.assertIn('content="text/html; charset=iso-8859-1"', output)
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def test_make_file_usascii_charset_with_nonascii_input(self):
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html_diff = difflib.HtmlDiff()
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output = html_diff.make_file(patch914575_nonascii_from1.splitlines(),
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patch914575_nonascii_to1.splitlines(),
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charset='us-ascii')
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self.assertIn('content="text/html; charset=us-ascii"', output)
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self.assertIn('ımplıcıt', output)
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class TestOutputFormat(unittest.TestCase):
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def test_tab_delimiter(self):
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args = ['one', 'two', 'Original', 'Current',
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'2005-01-26 23:30:50', '2010-04-02 10:20:52']
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ud = difflib.unified_diff(*args, lineterm='')
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self.assertEqual(list(ud)[0:2], [
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"--- Original\t2005-01-26 23:30:50",
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"+++ Current\t2010-04-02 10:20:52"])
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cd = difflib.context_diff(*args, lineterm='')
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self.assertEqual(list(cd)[0:2], [
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"*** Original\t2005-01-26 23:30:50",
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"--- Current\t2010-04-02 10:20:52"])
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def test_no_trailing_tab_on_empty_filedate(self):
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args = ['one', 'two', 'Original', 'Current']
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ud = difflib.unified_diff(*args, lineterm='')
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self.assertEqual(list(ud)[0:2], ["--- Original", "+++ Current"])
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cd = difflib.context_diff(*args, lineterm='')
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self.assertEqual(list(cd)[0:2], ["*** Original", "--- Current"])
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def test_range_format_unified(self):
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# Per the diff spec at http://www.unix.org/single_unix_specification/
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spec = '''\
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Each <range> field shall be of the form:
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%1d", <beginning line number> if the range contains exactly one line,
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and:
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"%1d,%1d", <beginning line number>, <number of lines> otherwise.
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If a range is empty, its beginning line number shall be the number of
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the line just before the range, or 0 if the empty range starts the file.
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'''
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fmt = difflib._format_range_unified
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self.assertEqual(fmt(3,3), '3,0')
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self.assertEqual(fmt(3,4), '4')
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self.assertEqual(fmt(3,5), '4,2')
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self.assertEqual(fmt(3,6), '4,3')
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self.assertEqual(fmt(0,0), '0,0')
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def test_range_format_context(self):
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# Per the diff spec at http://www.unix.org/single_unix_specification/
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spec = '''\
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The range of lines in file1 shall be written in the following format
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if the range contains two or more lines:
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"*** %d,%d ****\n", <beginning line number>, <ending line number>
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and the following format otherwise:
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"*** %d ****\n", <ending line number>
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The ending line number of an empty range shall be the number of the preceding line,
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or 0 if the range is at the start of the file.
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Next, the range of lines in file2 shall be written in the following format
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if the range contains two or more lines:
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"--- %d,%d ----\n", <beginning line number>, <ending line number>
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and the following format otherwise:
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"--- %d ----\n", <ending line number>
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'''
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fmt = difflib._format_range_context
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self.assertEqual(fmt(3,3), '3')
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self.assertEqual(fmt(3,4), '4')
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self.assertEqual(fmt(3,5), '4,5')
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self.assertEqual(fmt(3,6), '4,6')
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self.assertEqual(fmt(0,0), '0')
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class TestBytes(unittest.TestCase):
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# don't really care about the content of the output, just the fact
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# that it's bytes and we don't crash
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def check(self, diff):
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diff = list(diff) # trigger exceptions first
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for line in diff:
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self.assertIsInstance(
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line, bytes,
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"all lines of diff should be bytes, but got: %r" % line)
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def test_byte_content(self):
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# if we receive byte strings, we return byte strings
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a = [b'hello', b'andr\xe9'] # iso-8859-1 bytes
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b = [b'hello', b'andr\xc3\xa9'] # utf-8 bytes
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unified = difflib.unified_diff
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context = difflib.context_diff
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check = self.check
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check(difflib.diff_bytes(unified, a, a))
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check(difflib.diff_bytes(unified, a, b))
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# now with filenames (content and filenames are all bytes!)
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check(difflib.diff_bytes(unified, a, a, b'a', b'a'))
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check(difflib.diff_bytes(unified, a, b, b'a', b'b'))
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# and with filenames and dates
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check(difflib.diff_bytes(unified, a, a, b'a', b'a', b'2005', b'2013'))
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check(difflib.diff_bytes(unified, a, b, b'a', b'b', b'2005', b'2013'))
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# same all over again, with context diff
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check(difflib.diff_bytes(context, a, a))
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check(difflib.diff_bytes(context, a, b))
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check(difflib.diff_bytes(context, a, a, b'a', b'a'))
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check(difflib.diff_bytes(context, a, b, b'a', b'b'))
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check(difflib.diff_bytes(context, a, a, b'a', b'a', b'2005', b'2013'))
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check(difflib.diff_bytes(context, a, b, b'a', b'b', b'2005', b'2013'))
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def test_byte_filenames(self):
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# somebody renamed a file from ISO-8859-2 to UTF-8
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fna = b'\xb3odz.txt' # "łodz.txt"
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fnb = b'\xc5\x82odz.txt'
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# they transcoded the content at the same time
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a = [b'\xa3odz is a city in Poland.']
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b = [b'\xc5\x81odz is a city in Poland.']
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check = self.check
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unified = difflib.unified_diff
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context = difflib.context_diff
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check(difflib.diff_bytes(unified, a, b, fna, fnb))
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check(difflib.diff_bytes(context, a, b, fna, fnb))
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def assertDiff(expect, actual):
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# do not compare expect and equal as lists, because unittest
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# uses difflib to report difference between lists
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actual = list(actual)
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self.assertEqual(len(expect), len(actual))
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for e, a in zip(expect, actual):
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self.assertEqual(e, a)
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expect = [
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b'--- \xb3odz.txt',
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b'+++ \xc5\x82odz.txt',
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b'@@ -1 +1 @@',
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b'-\xa3odz is a city in Poland.',
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b'+\xc5\x81odz is a city in Poland.',
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]
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actual = difflib.diff_bytes(unified, a, b, fna, fnb, lineterm=b'')
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assertDiff(expect, actual)
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# with dates (plain ASCII)
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datea = b'2005-03-18'
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dateb = b'2005-03-19'
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check(difflib.diff_bytes(unified, a, b, fna, fnb, datea, dateb))
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check(difflib.diff_bytes(context, a, b, fna, fnb, datea, dateb))
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expect = [
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# note the mixed encodings here: this is deeply wrong by every
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# tenet of Unicode, but it doesn't crash, it's parseable by
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# patch, and it's how UNIX(tm) diff behaves
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b'--- \xb3odz.txt\t2005-03-18',
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b'+++ \xc5\x82odz.txt\t2005-03-19',
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b'@@ -1 +1 @@',
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b'-\xa3odz is a city in Poland.',
|
||
b'+\xc5\x81odz is a city in Poland.',
|
||
]
|
||
actual = difflib.diff_bytes(unified, a, b, fna, fnb, datea, dateb,
|
||
lineterm=b'')
|
||
assertDiff(expect, actual)
|
||
|
||
def test_mixed_types_content(self):
|
||
# type of input content must be consistent: all str or all bytes
|
||
a = [b'hello']
|
||
b = ['hello']
|
||
|
||
unified = difflib.unified_diff
|
||
context = difflib.context_diff
|
||
|
||
expect = "lines to compare must be str, not bytes (b'hello')"
|
||
self._assert_type_error(expect, unified, a, b)
|
||
self._assert_type_error(expect, unified, b, a)
|
||
self._assert_type_error(expect, context, a, b)
|
||
self._assert_type_error(expect, context, b, a)
|
||
|
||
expect = "all arguments must be bytes, not str ('hello')"
|
||
self._assert_type_error(expect, difflib.diff_bytes, unified, a, b)
|
||
self._assert_type_error(expect, difflib.diff_bytes, unified, b, a)
|
||
self._assert_type_error(expect, difflib.diff_bytes, context, a, b)
|
||
self._assert_type_error(expect, difflib.diff_bytes, context, b, a)
|
||
|
||
def test_mixed_types_filenames(self):
|
||
# cannot pass filenames as bytes if content is str (this may not be
|
||
# the right behaviour, but at least the test demonstrates how
|
||
# things work)
|
||
a = ['hello\n']
|
||
b = ['ohell\n']
|
||
fna = b'ol\xe9.txt' # filename transcoded from ISO-8859-1
|
||
fnb = b'ol\xc3a9.txt' # to UTF-8
|
||
self._assert_type_error(
|
||
"all arguments must be str, not: b'ol\\xe9.txt'",
|
||
difflib.unified_diff, a, b, fna, fnb)
|
||
|
||
def test_mixed_types_dates(self):
|
||
# type of dates must be consistent with type of contents
|
||
a = [b'foo\n']
|
||
b = [b'bar\n']
|
||
datea = '1 fév'
|
||
dateb = '3 fév'
|
||
self._assert_type_error(
|
||
"all arguments must be bytes, not str ('1 fév')",
|
||
difflib.diff_bytes, difflib.unified_diff,
|
||
a, b, b'a', b'b', datea, dateb)
|
||
|
||
# if input is str, non-ASCII dates are fine
|
||
a = ['foo\n']
|
||
b = ['bar\n']
|
||
list(difflib.unified_diff(a, b, 'a', 'b', datea, dateb))
|
||
|
||
def _assert_type_error(self, msg, generator, *args):
|
||
with self.assertRaises(TypeError) as ctx:
|
||
list(generator(*args))
|
||
self.assertEqual(msg, str(ctx.exception))
|
||
|
||
class TestJunkAPIs(unittest.TestCase):
|
||
def test_is_line_junk_true(self):
|
||
for line in ['#', ' ', ' #', '# ', ' # ', '']:
|
||
self.assertTrue(difflib.IS_LINE_JUNK(line), repr(line))
|
||
|
||
def test_is_line_junk_false(self):
|
||
for line in ['##', ' ##', '## ', 'abc ', 'abc #', 'Mr. Moose is up!']:
|
||
self.assertFalse(difflib.IS_LINE_JUNK(line), repr(line))
|
||
|
||
def test_is_line_junk_REDOS(self):
|
||
evil_input = ('\t' * 1000000) + '##'
|
||
self.assertFalse(difflib.IS_LINE_JUNK(evil_input))
|
||
|
||
def test_is_character_junk_true(self):
|
||
for char in [' ', '\t']:
|
||
self.assertTrue(difflib.IS_CHARACTER_JUNK(char), repr(char))
|
||
|
||
def test_is_character_junk_false(self):
|
||
for char in ['a', '#', '\n', '\f', '\r', '\v']:
|
||
self.assertFalse(difflib.IS_CHARACTER_JUNK(char), repr(char))
|
||
|
||
def test_main():
|
||
difflib.HtmlDiff._default_prefix = 0
|
||
Doctests = doctest.DocTestSuite(difflib)
|
||
run_unittest(
|
||
TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
|
||
TestOutputFormat, TestBytes, TestJunkAPIs, Doctests)
|
||
|
||
if __name__ == '__main__':
|
||
test_main()
|