Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_difflib.py @ 73807:1efefeda00a7 3.2

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#8414: add more tests for "assert". Initial patch by Gregory Nofi.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 02 Dec 2011 18:22:52 +0200
parents 8733fa6d3cfa
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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aa0d2d51fbde Get rid of relative imports in all unittests. Now anything that
Barry Warsaw <barry@python.org>
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1 import difflib
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Benjamin Peterson <benjamin@python.org>
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2 from test.support import run_unittest, findfile
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3 import unittest
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79ec7e302d53 Exercise Jim Fulton's new doctest extension for running doctests in a
Raymond Hettinger <python@rcn.com>
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4 import doctest
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16bfe9386068 Patch #1413711: Certain patterns of differences were making difflib
Gustavo Niemeyer <gustavo@niemeyer.net>
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5 import sys
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6
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7
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8 class TestWithAscii(unittest.TestCase):
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9 def test_one_insert(self):
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10 sm = difflib.SequenceMatcher(None, 'b' * 100, 'a' + 'b' * 100)
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11 self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
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12 self.assertEqual(list(sm.get_opcodes()),
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13 [ ('insert', 0, 0, 0, 1),
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14 ('equal', 0, 100, 1, 101)])
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15 self.assertEqual(sm.bpopular, set())
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16 sm = difflib.SequenceMatcher(None, 'b' * 100, 'b' * 50 + 'a' + 'b' * 50)
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17 self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
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18 self.assertEqual(list(sm.get_opcodes()),
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19 [ ('equal', 0, 50, 0, 50),
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20 ('insert', 50, 50, 50, 51),
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21 ('equal', 50, 100, 51, 101)])
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22 self.assertEqual(sm.bpopular, set())
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23
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24 def test_one_delete(self):
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25 sm = difflib.SequenceMatcher(None, 'a' * 40 + 'c' + 'b' * 40, 'a' * 40 + 'b' * 40)
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26 self.assertAlmostEqual(sm.ratio(), 0.994, places=3)
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27 self.assertEqual(list(sm.get_opcodes()),
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28 [ ('equal', 0, 40, 0, 40),
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29 ('delete', 40, 41, 40, 40),
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30 ('equal', 41, 81, 40, 80)])
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31
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32 def test_bjunk(self):
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33 sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
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34 a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40)
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35 self.assertEqual(sm.bjunk, set())
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36
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37 sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
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38 a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
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39 self.assertEqual(sm.bjunk, {' '})
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40
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41 sm = difflib.SequenceMatcher(isjunk=lambda x: x in [' ', 'b'],
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42 a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
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43 self.assertEqual(sm.bjunk, {' ', 'b'})
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44
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45
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46 class TestAutojunk(unittest.TestCase):
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47 """Tests for the autojunk parameter added in 2.7"""
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48 def test_one_insert_homogenous_sequence(self):
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49 # By default autojunk=True and the heuristic kicks in for a sequence
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50 # of length 200+
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51 seq1 = 'b' * 200
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52 seq2 = 'a' + 'b' * 200
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53
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54 sm = difflib.SequenceMatcher(None, seq1, seq2)
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55 self.assertAlmostEqual(sm.ratio(), 0, places=3)
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56 self.assertEqual(sm.bpopular, {'b'})
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57
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58 # Now turn the heuristic off
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59 sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
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60 self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
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61 self.assertEqual(sm.bpopular, set())
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62
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63
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64 class TestSFbugs(unittest.TestCase):
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65 def test_ratio_for_null_seqn(self):
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66 # Check clearing of SF bug 763023
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67 s = difflib.SequenceMatcher(None, [], [])
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68 self.assertEqual(s.ratio(), 1)
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69 self.assertEqual(s.quick_ratio(), 1)
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70 self.assertEqual(s.real_quick_ratio(), 1)
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71
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72 def test_comparing_empty_lists(self):
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73 # Check fix for bug #979794
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74 group_gen = difflib.SequenceMatcher(None, [], []).get_grouped_opcodes()
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75 self.assertRaises(StopIteration, next, group_gen)
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76 diff_gen = difflib.unified_diff([], [])
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77 self.assertRaises(StopIteration, next, diff_gen)
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78
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79 def test_added_tab_hint(self):
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80 # Check fix for bug #1488943
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81 diff = list(difflib.Differ().compare(["\tI am a buggy"],["\t\tI am a bug"]))
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82 self.assertEqual("- \tI am a buggy", diff[0])
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83 self.assertEqual("? --\n", diff[1])
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84 self.assertEqual("+ \t\tI am a bug", diff[2])
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85 self.assertEqual("? +\n", diff[3])
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86
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87 patch914575_from1 = """
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88 1. Beautiful is beTTer than ugly.
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89 2. Explicit is better than implicit.
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90 3. Simple is better than complex.
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91 4. Complex is better than complicated.
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92 """
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93
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94 patch914575_to1 = """
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95 1. Beautiful is better than ugly.
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96 3. Simple is better than complex.
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97 4. Complicated is better than complex.
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98 5. Flat is better than nested.
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99 """
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100
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101 patch914575_from2 = """
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102 \t\tLine 1: preceeded by from:[tt] to:[ssss]
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103 \t\tLine 2: preceeded by from:[sstt] to:[sssst]
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104 \t \tLine 3: preceeded by from:[sstst] to:[ssssss]
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105 Line 4: \thas from:[sst] to:[sss] after :
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106 Line 5: has from:[t] to:[ss] at end\t
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107 """
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108
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109 patch914575_to2 = """
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110 Line 1: preceeded by from:[tt] to:[ssss]
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111 \tLine 2: preceeded by from:[sstt] to:[sssst]
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112 Line 3: preceeded by from:[sstst] to:[ssssss]
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113 Line 4: has from:[sst] to:[sss] after :
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114 Line 5: has from:[t] to:[ss] at end
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115 """
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116
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117 patch914575_from3 = """line 0
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118 1234567890123456789012345689012345
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119 line 1
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120 line 2
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121 line 3
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122 line 4 changed
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123 line 5 changed
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124 line 6 changed
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125 line 7
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126 line 8 subtracted
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127 line 9
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128 1234567890123456789012345689012345
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129 short line
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130 just fits in!!
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131 just fits in two lines yup!!
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132 the end"""
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133
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134 patch914575_to3 = """line 0
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135 1234567890123456789012345689012345
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136 line 1
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137 line 2 added
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138 line 3
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139 line 4 chanGEd
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140 line 5a chanGed
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141 line 6a changEd
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142 line 7
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143 line 8
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144 line 9
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145 1234567890
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146 another long line that needs to be wrapped
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147 just fitS in!!
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148 just fits in two lineS yup!!
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149 the end"""
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150
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151 class TestSFpatches(unittest.TestCase):
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152
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153 def test_html_diff(self):
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154 # Check SF patch 914575 for generating HTML differences
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155 f1a = ((patch914575_from1 + '123\n'*10)*3)
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156 t1a = (patch914575_to1 + '123\n'*10)*3
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157 f1b = '456\n'*10 + f1a
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158 t1b = '456\n'*10 + t1a
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159 f1a = f1a.splitlines()
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160 t1a = t1a.splitlines()
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161 f1b = f1b.splitlines()
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162 t1b = t1b.splitlines()
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163 f2 = patch914575_from2.splitlines()
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164 t2 = patch914575_to2.splitlines()
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165 f3 = patch914575_from3
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166 t3 = patch914575_to3
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167 i = difflib.HtmlDiff()
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168 j = difflib.HtmlDiff(tabsize=2)
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169 k = difflib.HtmlDiff(wrapcolumn=14)
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170
33319
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171 full = i.make_file(f1a,t1a,'from','to',context=False,numlines=5)
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172 tables = '\n'.join(
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173 [
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174 '<h2>Context (first diff within numlines=5(default))</h2>',
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175 i.make_table(f1a,t1a,'from','to',context=True),
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176 '<h2>Context (first diff after numlines=5(default))</h2>',
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177 i.make_table(f1b,t1b,'from','to',context=True),
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178 '<h2>Context (numlines=6)</h2>',
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179 i.make_table(f1a,t1a,'from','to',context=True,numlines=6),
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180 '<h2>Context (numlines=0)</h2>',
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181 i.make_table(f1a,t1a,'from','to',context=True,numlines=0),
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182 '<h2>Same Context</h2>',
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183 i.make_table(f1a,f1a,'from','to',context=True),
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184 '<h2>Same Full</h2>',
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185 i.make_table(f1a,f1a,'from','to',context=False),
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186 '<h2>Empty Context</h2>',
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187 i.make_table([],[],'from','to',context=True),
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188 '<h2>Empty Full</h2>',
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189 i.make_table([],[],'from','to',context=False),
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190 '<h2>tabsize=2</h2>',
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191 j.make_table(f2,t2),
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192 '<h2>tabsize=default</h2>',
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193 i.make_table(f2,t2),
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194 '<h2>Context (wrapcolumn=14,numlines=0)</h2>',
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195 k.make_table(f3.splitlines(),t3.splitlines(),context=True,numlines=0),
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196 '<h2>wrapcolumn=14,splitlines()</h2>',
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197 k.make_table(f3.splitlines(),t3.splitlines()),
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198 '<h2>wrapcolumn=14,splitlines(True)</h2>',
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199 k.make_table(f3.splitlines(True),t3.splitlines(True)),
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200 ])
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201 actual = full.replace('</body>','\n%s\n</body>' % tables)
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202
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203 # temporarily uncomment next two lines to baseline this test
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204 #with open('test_difflib_expect.html','w') as fp:
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205 # fp.write(actual)
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206
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207 with open(findfile('test_difflib_expect.html')) as fp:
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208 self.assertEqual(actual, fp.read())
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209
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210 def test_recursion_limit(self):
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211 # Check if the problem described in patch #1413711 exists.
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212 limit = sys.getrecursionlimit()
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213 old = [(i%2 and "K:%d" or "V:A:%d") % i for i in range(limit*2)]
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214 new = [(i%2 and "K:%d" or "V:B:%d") % i for i in range(limit*2)]
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215 difflib.SequenceMatcher(None, old, new).get_opcodes()
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216
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217
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218 class TestOutputFormat(unittest.TestCase):
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219 def test_tab_delimiter(self):
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220 args = ['one', 'two', 'Original', 'Current',
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221 '2005-01-26 23:30:50', '2010-04-02 10:20:52']
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222 ud = difflib.unified_diff(*args, lineterm='')
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223 self.assertEqual(list(ud)[0:2], [
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224 "--- Original\t2005-01-26 23:30:50",
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225 "+++ Current\t2010-04-02 10:20:52"])
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226 cd = difflib.context_diff(*args, lineterm='')
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227 self.assertEqual(list(cd)[0:2], [
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228 "*** Original\t2005-01-26 23:30:50",
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229 "--- Current\t2010-04-02 10:20:52"])
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230
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231 def test_no_trailing_tab_on_empty_filedate(self):
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232 args = ['one', 'two', 'Original', 'Current']
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233 ud = difflib.unified_diff(*args, lineterm='')
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234 self.assertEqual(list(ud)[0:2], ["--- Original", "+++ Current"])
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235
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236 cd = difflib.context_diff(*args, lineterm='')
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237 self.assertEqual(list(cd)[0:2], ["*** Original", "--- Current"])
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238
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239 def test_range_format_unified(self):
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240 # Per the diff spec at http://www.unix.org/single_unix_specification/
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241 spec = '''\
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242 Each <range> field shall be of the form:
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243 %1d", <beginning line number> if the range contains exactly one line,
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244 and:
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245 "%1d,%1d", <beginning line number>, <number of lines> otherwise.
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246 If a range is empty, its beginning line number shall be the number of
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247 the line just before the range, or 0 if the empty range starts the file.
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248 '''
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249 fmt = difflib._format_range_unified
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250 self.assertEqual(fmt(3,3), '3,0')
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251 self.assertEqual(fmt(3,4), '4')
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252 self.assertEqual(fmt(3,5), '4,2')
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253 self.assertEqual(fmt(3,6), '4,3')
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254 self.assertEqual(fmt(0,0), '0,0')
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255
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256 def test_range_format_context(self):
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257 # Per the diff spec at http://www.unix.org/single_unix_specification/
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258 spec = '''\
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259 The range of lines in file1 shall be written in the following format
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260 if the range contains two or more lines:
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261 "*** %d,%d ****\n", <beginning line number>, <ending line number>
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262 and the following format otherwise:
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263 "*** %d ****\n", <ending line number>
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264 The ending line number of an empty range shall be the number of the preceding line,
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265 or 0 if the range is at the start of the file.
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266
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267 Next, the range of lines in file2 shall be written in the following format
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268 if the range contains two or more lines:
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269 "--- %d,%d ----\n", <beginning line number>, <ending line number>
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270 and the following format otherwise:
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271 "--- %d ----\n", <ending line number>
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272 '''
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273 fmt = difflib._format_range_context
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274 self.assertEqual(fmt(3,3), '3')
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275 self.assertEqual(fmt(3,4), '4')
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276 self.assertEqual(fmt(3,5), '4,5')
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277 self.assertEqual(fmt(3,6), '4,6')
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278 self.assertEqual(fmt(0,0), '0')
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279
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280
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281 def test_main():
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282 difflib.HtmlDiff._default_prefix = 0
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283 Doctests = doctest.DocTestSuite(difflib)
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284 run_unittest(
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285 TestWithAscii, TestAutojunk, TestSFpatches, TestSFbugs,
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286 TestOutputFormat, Doctests)
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287
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288 if __name__ == '__main__':
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289 test_main()