annotate tests/test-bdiff.py @ 47897:4f0ebf83e4dc

dirstatemap: conclude `reset_state` with logic using the new __init__ Now the DirstateItem can deal with most of the logic related to its initialization, our goal is to migrate the function to a more "unified" way were minimal processing is done early before more generic code gets into play. Nobody is calling this code yet, but this is about to change. Differential Revision: https://phab.mercurial-scm.org/D11322
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 16 Jul 2021 17:03:39 +0200
parents 2372284d9457
children 6000f5b25c9b
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1 from __future__ import absolute_import, print_function
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2 import collections
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3 import struct
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4 import unittest
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5
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6 from mercurial import mdiff
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7
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8
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9 class diffreplace(collections.namedtuple('diffreplace', 'start end from_ to')):
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10 def __repr__(self):
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11 return 'diffreplace(%r, %r, %r, %r)' % self
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13
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14 class BdiffTests(unittest.TestCase):
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15 def assert_bdiff_applies(self, a, b):
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16 d = mdiff.textdiff(a, b)
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17 c = a
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18 if d:
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19 c = mdiff.patches(a, [d])
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20 self.assertEqual(
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21 c,
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22 b,
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23 (
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24 "bad diff+patch result from\n %r to\n "
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25 "%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200])
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26 ),
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27 )
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28
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29 def assert_bdiff(self, a, b):
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30 self.assert_bdiff_applies(a, b)
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31 self.assert_bdiff_applies(b, a)
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32
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33 def test_bdiff_basic(self):
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34 cases = [
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35 (b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
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36 (b"a\nb\nc\n", b"a\nc\n"),
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37 (b"", b""),
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38 (b"a\nb\nc", b"a\nb\nc"),
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39 (b"a\nb\nc\nd\n", b"a\nd\n"),
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40 (b"a\nb\nc\nd\n", b"a\nc\ne\n"),
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41 (b"a\nb\nc\n", b"a\nc\n"),
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42 (b"a\n", b"c\na\nb\n"),
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43 (b"a\n", b""),
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44 (b"a\n", b"b\nc\n"),
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45 (b"a\n", b"c\na\n"),
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46 (b"", b"adjfkjdjksdhfksj"),
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47 (b"", b"ab"),
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48 (b"", b"abc"),
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49 (b"a", b"a"),
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50 (b"ab", b"ab"),
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51 (b"abc", b"abc"),
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52 (b"a\n", b"a\n"),
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53 (b"a\nb", b"a\nb"),
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54 ]
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55 for a, b in cases:
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56 self.assert_bdiff(a, b)
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57
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58 def showdiff(self, a, b):
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59 bin = mdiff.textdiff(a, b)
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60 pos = 0
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61 q = 0
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62 actions = []
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63 while pos < len(bin):
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64 p1, p2, l = struct.unpack(">lll", bin[pos : pos + 12])
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65 pos += 12
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66 if p1:
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67 actions.append(a[q:p1])
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68 actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos : pos + l]))
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69 pos += l
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70 q = p2
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71 if q < len(a):
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72 actions.append(a[q:])
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73 return actions
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74
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75 def test_issue1295(self):
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76 cases = [
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77 (
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78 b"x\n\nx\n\nx\n\nx\n\nz\n",
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79 b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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80 [
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81 b'x\n\nx\n\n',
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82 diffreplace(6, 6, b'', b'y\n\n'),
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83 b'x\n\nx\n\nz\n',
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84 ],
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85 ),
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86 (
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87 b"x\n\nx\n\nx\n\nx\n\nz\n",
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88 b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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89 [
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90 b'x\n\nx\n\n',
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91 diffreplace(6, 6, b'', b'y\n\n'),
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92 b'x\n\n',
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93 diffreplace(9, 9, b'', b'y\n\n'),
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94 b'x\n\nz\n',
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95 ],
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96 ),
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97 ]
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98 for old, new, want in cases:
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99 self.assertEqual(self.showdiff(old, new), want)
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100
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101 def test_issue1295_varies_on_pure(self):
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102 # we should pick up abbbc. rather than bc.de as the longest match
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103 got = self.showdiff(
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104 b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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105 b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n",
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106 )
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107 want_c = [
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108 b'a\nb\nb\n',
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109 diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
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110 b'b\nc\n.\nd\ne\n',
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111 diffreplace(16, 18, b'.\n', b''),
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112 b'f\n',
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113 ]
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114 want_pure = [
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115 diffreplace(0, 0, b'', b'a\nb\nb\n'),
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116 b'a\nb\nb\nb\nc\n.\n',
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117 diffreplace(12, 12, b'', b'b\nc\n.\n'),
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118 b'd\ne\n',
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119 diffreplace(16, 18, b'.\n', b''),
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120 b'f\n',
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121 ]
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122 self.assertTrue(
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123 got in (want_c, want_pure),
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124 'got: %r, wanted either %r or %r' % (got, want_c, want_pure),
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125 )
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126
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127 def test_fixws(self):
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128 cases = [
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129 (b" \ta\r b\t\n", b"ab\n", 1),
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130 (b" \ta\r b\t\n", b" a b\n", 0),
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131 (b"", b"", 1),
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132 (b"", b"", 0),
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133 ]
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134 for a, b, allws in cases:
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135 c = mdiff.fixws(a, allws)
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136 self.assertEqual(
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137 c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws)
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138 )
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139
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140 def test_nice_diff_for_trivial_change(self):
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141 self.assertEqual(
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142 self.showdiff(
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143 b''.join(b'<%d\n-\n' % i for i in range(5)),
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144 b''.join(b'>%d\n-\n' % i for i in range(5)),
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145 ),
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146 [
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147 diffreplace(0, 3, b'<0\n', b'>0\n'),
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148 b'-\n',
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149 diffreplace(5, 8, b'<1\n', b'>1\n'),
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150 b'-\n',
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151 diffreplace(10, 13, b'<2\n', b'>2\n'),
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152 b'-\n',
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153 diffreplace(15, 18, b'<3\n', b'>3\n'),
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154 b'-\n',
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155 diffreplace(20, 23, b'<4\n', b'>4\n'),
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156 b'-\n',
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157 ],
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158 )
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159
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160 def test_prefer_appending(self):
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161 # 1 line to 3 lines
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162 self.assertEqual(
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163 self.showdiff(b'a\n', b'a\n' * 3),
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164 [b'a\n', diffreplace(2, 2, b'', b'a\na\n')],
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165 )
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166 # 1 line to 5 lines
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167 self.assertEqual(
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168 self.showdiff(b'a\n', b'a\n' * 5),
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169 [b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')],
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170 )
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171
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172 def test_prefer_removing_trailing(self):
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173 # 3 lines to 1 line
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174 self.assertEqual(
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175 self.showdiff(b'a\n' * 3, b'a\n'),
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176 [b'a\n', diffreplace(2, 6, b'a\na\n', b'')],
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177 )
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178 # 5 lines to 1 line
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179 self.assertEqual(
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180 self.showdiff(b'a\n' * 5, b'a\n'),
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181 [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')],
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182 )
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183
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184
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185 if __name__ == '__main__':
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186 import silenttestrunner
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187
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188 silenttestrunner.main(__name__)