Mercurial > hg > mercurial-crew-with-dirclash
annotate contrib/simplemerge @ 4359:2e3c54fb79a3
actually port simplemerge to hg
- use bdiff instead of patiencediff; this is a larger change, since
bdiff works on 2 multi-line strings, while patiencediff works on 2
lists;
- rename the main class from Merge3 to Merge3Text and add a Merge3
class that derives from Merge3Text. This new Merge3 class has
the same interface from the original class, so that the tests
still work;
- Merge3 uses util.binary to detect binary data and raises
util.Abort instead of a specific exception;
- don't use the @decorator syntax, to keep python2.3 compatibility;
- the test uses unittest, which likes to print how long it took to
run. This obviously doesn't play too well with hg's test suite,
so we override time.time to fool unittest;
- one test has a different (but still valid) output because of the
different diff algorithm used;
- the TestCase class used by bzr has some extras to help debugging.
test-merge3.py used 2 of them:
- log method to log some data
- assertEqualDiff method to ease viewing diffs of diffs
We add a dummy log method and use regular assertEquals instead of
assertEqualDiff.
- make simplemerge executable and add "#!/usr/bin/env python" header
author | Alexis S. L. Carvalho <alexis@cecm.usp.br> |
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date | Mon, 16 Apr 2007 20:17:39 -0300 |
parents | 465b9ea02868 |
children | d5c3a70f8422 |
rev | line source |
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1 #!/usr/bin/env python |
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2 # Copyright (C) 2004, 2005 Canonical Ltd |
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3 # |
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4 # This program is free software; you can redistribute it and/or modify |
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5 # it under the terms of the GNU General Public License as published by |
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6 # the Free Software Foundation; either version 2 of the License, or |
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7 # (at your option) any later version. |
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8 # |
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9 # This program is distributed in the hope that it will be useful, |
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10 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 # GNU General Public License for more details. |
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13 # |
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14 # You should have received a copy of the GNU General Public License |
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15 # along with this program; if not, write to the Free Software |
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16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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17 |
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18 |
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19 # mbp: "you know that thing where cvs gives you conflict markers?" |
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20 # s: "i hate that." |
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21 |
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22 |
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23 from mercurial import util, mdiff |
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24 from mercurial.i18n import _ |
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25 |
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26 |
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27 class CantReprocessAndShowBase(Exception): |
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28 pass |
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29 |
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30 |
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31 def intersect(ra, rb): |
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32 """Given two ranges return the range where they intersect or None. |
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33 |
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34 >>> intersect((0, 10), (0, 6)) |
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35 (0, 6) |
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36 >>> intersect((0, 10), (5, 15)) |
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37 (5, 10) |
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38 >>> intersect((0, 10), (10, 15)) |
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39 >>> intersect((0, 9), (10, 15)) |
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40 >>> intersect((0, 9), (7, 15)) |
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41 (7, 9) |
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42 """ |
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43 assert ra[0] <= ra[1] |
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44 assert rb[0] <= rb[1] |
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45 |
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46 sa = max(ra[0], rb[0]) |
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47 sb = min(ra[1], rb[1]) |
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48 if sa < sb: |
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49 return sa, sb |
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50 else: |
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51 return None |
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52 |
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53 |
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54 def compare_range(a, astart, aend, b, bstart, bend): |
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55 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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56 """ |
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57 if (aend-astart) != (bend-bstart): |
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58 return False |
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59 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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60 if a[ia] != b[ib]: |
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61 return False |
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62 else: |
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63 return True |
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64 |
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65 |
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66 |
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67 |
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68 class Merge3Text(object): |
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69 """3-way merge of texts. |
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70 |
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71 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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72 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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73 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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74 self.basetext = basetext |
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75 self.atext = atext |
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76 self.btext = btext |
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77 if base is None: |
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78 base = mdiff.splitnewlines(basetext) |
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79 if a is None: |
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80 a = mdiff.splitnewlines(atext) |
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81 if b is None: |
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82 b = mdiff.splitnewlines(btext) |
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83 self.base = base |
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84 self.a = a |
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85 self.b = b |
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86 |
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87 |
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88 |
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89 def merge_lines(self, |
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90 name_a=None, |
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91 name_b=None, |
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92 name_base=None, |
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93 start_marker='<<<<<<<', |
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94 mid_marker='=======', |
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95 end_marker='>>>>>>>', |
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96 base_marker=None, |
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97 reprocess=False): |
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98 """Return merge in cvs-like form. |
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99 """ |
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100 newline = '\n' |
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101 if len(self.a) > 0: |
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102 if self.a[0].endswith('\r\n'): |
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103 newline = '\r\n' |
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104 elif self.a[0].endswith('\r'): |
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105 newline = '\r' |
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106 if base_marker and reprocess: |
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107 raise CantReprocessAndShowBase() |
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108 if name_a: |
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109 start_marker = start_marker + ' ' + name_a |
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110 if name_b: |
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111 end_marker = end_marker + ' ' + name_b |
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112 if name_base and base_marker: |
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113 base_marker = base_marker + ' ' + name_base |
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114 merge_regions = self.merge_regions() |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
115 if reprocess is True: |
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Import 3-way merge code from bzr
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parents:
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|
116 merge_regions = self.reprocess_merge_regions(merge_regions) |
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parents:
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117 for t in merge_regions: |
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118 what = t[0] |
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119 if what == 'unchanged': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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120 for i in range(t[1], t[2]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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121 yield self.base[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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122 elif what == 'a' or what == 'same': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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123 for i in range(t[1], t[2]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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124 yield self.a[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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125 elif what == 'b': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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126 for i in range(t[1], t[2]): |
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parents:
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127 yield self.b[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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128 elif what == 'conflict': |
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129 yield start_marker + newline |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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130 for i in range(t[3], t[4]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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131 yield self.a[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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132 if base_marker is not None: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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133 yield base_marker + newline |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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134 for i in range(t[1], t[2]): |
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parents:
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135 yield self.base[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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136 yield mid_marker + newline |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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137 for i in range(t[5], t[6]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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138 yield self.b[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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139 yield end_marker + newline |
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140 else: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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141 raise ValueError(what) |
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142 |
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143 |
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144 |
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145 |
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146 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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147 def merge_annotated(self): |
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148 """Return merge with conflicts, showing origin of lines. |
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149 |
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150 Most useful for debugging merge. |
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151 """ |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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152 for t in self.merge_regions(): |
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153 what = t[0] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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154 if what == 'unchanged': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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155 for i in range(t[1], t[2]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
156 yield 'u | ' + self.base[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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157 elif what == 'a' or what == 'same': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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158 for i in range(t[1], t[2]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
159 yield what[0] + ' | ' + self.a[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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160 elif what == 'b': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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161 for i in range(t[1], t[2]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
162 yield 'b | ' + self.b[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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163 elif what == 'conflict': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
164 yield '<<<<\n' |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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165 for i in range(t[3], t[4]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
166 yield 'A | ' + self.a[i] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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|
167 yield '----\n' |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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168 for i in range(t[5], t[6]): |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
169 yield 'B | ' + self.b[i] |
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parents:
diff
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|
170 yield '>>>>\n' |
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171 else: |
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diff
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|
172 raise ValueError(what) |
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|
173 |
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diff
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|
174 |
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parents:
diff
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|
175 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
176 |
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parents:
diff
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|
177 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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178 def merge_groups(self): |
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179 """Yield sequence of line groups. Each one is a tuple: |
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180 |
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181 'unchanged', lines |
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182 Lines unchanged from base |
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parents:
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|
183 |
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parents:
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184 'a', lines |
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parents:
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185 Lines taken from a |
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186 |
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parents:
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187 'same', lines |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
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188 Lines taken from a (and equal to b) |
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parents:
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|
189 |
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parents:
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|
190 'b', lines |
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parents:
diff
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|
191 Lines taken from b |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
192 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
193 'conflict', base_lines, a_lines, b_lines |
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parents:
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194 Lines from base were changed to either a or b and conflict. |
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parents:
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195 """ |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
196 for t in self.merge_regions(): |
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parents:
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197 what = t[0] |
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parents:
diff
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|
198 if what == 'unchanged': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
199 yield what, self.base[t[1]:t[2]] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
200 elif what == 'a' or what == 'same': |
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parents:
diff
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|
201 yield what, self.a[t[1]:t[2]] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
202 elif what == 'b': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
203 yield what, self.b[t[1]:t[2]] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
204 elif what == 'conflict': |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
205 yield (what, |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
206 self.base[t[1]:t[2]], |
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parents:
diff
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|
207 self.a[t[3]:t[4]], |
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parents:
diff
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|
208 self.b[t[5]:t[6]]) |
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parents:
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|
209 else: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
210 raise ValueError(what) |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
211 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
212 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
213 def merge_regions(self): |
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parents:
diff
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|
214 """Return sequences of matching and conflicting regions. |
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parents:
diff
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|
215 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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|
216 This returns tuples, where the first value says what kind we |
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Import 3-way merge code from bzr
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parents:
diff
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|
217 have: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
218 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
219 'unchanged', start, end |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
220 Take a region of base[start:end] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
221 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
222 'same', astart, aend |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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|
223 b and a are different from base but give the same result |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
224 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
225 'a', start, end |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
226 Non-clashing insertion from a[start:end] |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
227 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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|
228 Method is as follows: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
229 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
230 The two sequences align only on regions which match the base |
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Import 3-way merge code from bzr
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
231 and both descendents. These are found by doing a two-way diff |
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Import 3-way merge code from bzr
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
232 of each one against the base, and then finding the |
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Import 3-way merge code from bzr
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
233 intersections between those regions. These "sync regions" |
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Import 3-way merge code from bzr
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
234 are by definition unchanged in both and easily dealt with. |
465b9ea02868
Import 3-way merge code from bzr
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
changeset
|
235 |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
236 The regions in between can be in any of three cases: |
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Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
diff
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|
237 conflicted, or changed on only one side. |
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parents:
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|
238 """ |
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239 |
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240 # section a[0:ia] has been disposed of, etc |
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241 iz = ia = ib = 0 |
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242 |
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243 for zmatch, zend, amatch, aend, bmatch, bend in self.find_sync_regions(): |
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244 #print 'match base [%d:%d]' % (zmatch, zend) |
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245 |
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246 matchlen = zend - zmatch |
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247 assert matchlen >= 0 |
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248 assert matchlen == (aend - amatch) |
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249 assert matchlen == (bend - bmatch) |
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250 |
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251 len_a = amatch - ia |
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252 len_b = bmatch - ib |
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253 len_base = zmatch - iz |
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254 assert len_a >= 0 |
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255 assert len_b >= 0 |
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256 assert len_base >= 0 |
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257 |
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258 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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259 |
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260 if len_a or len_b: |
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261 # try to avoid actually slicing the lists |
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262 equal_a = compare_range(self.a, ia, amatch, |
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263 self.base, iz, zmatch) |
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264 equal_b = compare_range(self.b, ib, bmatch, |
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265 self.base, iz, zmatch) |
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266 same = compare_range(self.a, ia, amatch, |
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267 self.b, ib, bmatch) |
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268 |
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269 if same: |
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270 yield 'same', ia, amatch |
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271 elif equal_a and not equal_b: |
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272 yield 'b', ib, bmatch |
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273 elif equal_b and not equal_a: |
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274 yield 'a', ia, amatch |
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275 elif not equal_a and not equal_b: |
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276 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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277 else: |
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278 raise AssertionError("can't handle a=b=base but unmatched") |
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279 |
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280 ia = amatch |
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281 ib = bmatch |
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282 iz = zmatch |
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283 |
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284 # if the same part of the base was deleted on both sides |
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285 # that's OK, we can just skip it. |
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286 |
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287 |
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288 if matchlen > 0: |
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289 assert ia == amatch |
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290 assert ib == bmatch |
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291 assert iz == zmatch |
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292 |
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293 yield 'unchanged', zmatch, zend |
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294 iz = zend |
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295 ia = aend |
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296 ib = bend |
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297 |
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298 |
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299 def reprocess_merge_regions(self, merge_regions): |
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300 """Where there are conflict regions, remove the agreed lines. |
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301 |
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302 Lines where both A and B have made the same changes are |
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303 eliminated. |
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304 """ |
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305 for region in merge_regions: |
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306 if region[0] != "conflict": |
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307 yield region |
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308 continue |
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309 type, iz, zmatch, ia, amatch, ib, bmatch = region |
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310 a_region = self.a[ia:amatch] |
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311 b_region = self.b[ib:bmatch] |
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312 matches = mdiff.get_matching_blocks(''.join(a_region), |
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313 ''.join(b_region)) |
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314 next_a = ia |
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315 next_b = ib |
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316 for region_ia, region_ib, region_len in matches[:-1]: |
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317 region_ia += ia |
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318 region_ib += ib |
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319 reg = self.mismatch_region(next_a, region_ia, next_b, |
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320 region_ib) |
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321 if reg is not None: |
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322 yield reg |
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323 yield 'same', region_ia, region_len+region_ia |
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324 next_a = region_ia + region_len |
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325 next_b = region_ib + region_len |
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326 reg = self.mismatch_region(next_a, amatch, next_b, bmatch) |
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327 if reg is not None: |
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328 yield reg |
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329 |
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330 |
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331 def mismatch_region(next_a, region_ia, next_b, region_ib): |
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332 if next_a < region_ia or next_b < region_ib: |
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333 return 'conflict', None, None, next_a, region_ia, next_b, region_ib |
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334 mismatch_region = staticmethod(mismatch_region) |
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335 |
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336 |
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337 def find_sync_regions(self): |
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338 """Return a list of sync regions, where both descendents match the base. |
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339 |
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340 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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341 always a zero-length sync region at the end of all the files. |
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342 """ |
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343 |
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344 ia = ib = 0 |
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345 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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346 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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347 len_a = len(amatches) |
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348 len_b = len(bmatches) |
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349 |
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350 sl = [] |
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351 |
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352 while ia < len_a and ib < len_b: |
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353 abase, amatch, alen = amatches[ia] |
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354 bbase, bmatch, blen = bmatches[ib] |
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355 |
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356 # there is an unconflicted block at i; how long does it |
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357 # extend? until whichever one ends earlier. |
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358 i = intersect((abase, abase+alen), (bbase, bbase+blen)) |
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359 if i: |
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360 intbase = i[0] |
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361 intend = i[1] |
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362 intlen = intend - intbase |
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363 |
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364 # found a match of base[i[0], i[1]]; this may be less than |
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365 # the region that matches in either one |
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366 assert intlen <= alen |
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367 assert intlen <= blen |
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368 assert abase <= intbase |
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369 assert bbase <= intbase |
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370 |
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371 asub = amatch + (intbase - abase) |
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372 bsub = bmatch + (intbase - bbase) |
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373 aend = asub + intlen |
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374 bend = bsub + intlen |
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375 |
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376 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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377 (self.base[intbase:intend], self.a[asub:aend]) |
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378 |
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379 assert self.base[intbase:intend] == self.b[bsub:bend] |
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380 |
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381 sl.append((intbase, intend, |
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382 asub, aend, |
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383 bsub, bend)) |
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384 |
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385 # advance whichever one ends first in the base text |
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386 if (abase + alen) < (bbase + blen): |
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387 ia += 1 |
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388 else: |
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389 ib += 1 |
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390 |
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391 intbase = len(self.base) |
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392 abase = len(self.a) |
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393 bbase = len(self.b) |
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394 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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395 |
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396 return sl |
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397 |
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398 |
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399 |
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400 def find_unconflicted(self): |
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401 """Return a list of ranges in base that are not conflicted.""" |
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402 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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403 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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404 |
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405 unc = [] |
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406 |
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407 while am and bm: |
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408 # there is an unconflicted block at i; how long does it |
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409 # extend? until whichever one ends earlier. |
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410 a1 = am[0][0] |
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411 a2 = a1 + am[0][2] |
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412 b1 = bm[0][0] |
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413 b2 = b1 + bm[0][2] |
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414 i = intersect((a1, a2), (b1, b2)) |
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415 if i: |
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416 unc.append(i) |
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417 |
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418 if a2 < b2: |
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419 del am[0] |
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420 else: |
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421 del bm[0] |
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422 |
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423 return unc |
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424 |
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425 |
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426 # bzr compatible interface, for the tests |
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427 class Merge3(Merge3Text): |
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428 """3-way merge of texts. |
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429 |
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430 Given BASE, OTHER, THIS, tries to produce a combined text |
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431 incorporating the changes from both BASE->OTHER and BASE->THIS. |
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432 All three will typically be sequences of lines.""" |
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433 def __init__(self, base, a, b): |
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434 basetext = '\n'.join([i.strip('\n') for i in base] + ['']) |
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435 atext = '\n'.join([i.strip('\n') for i in a] + ['']) |
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436 btext = '\n'.join([i.strip('\n') for i in b] + ['']) |
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437 if util.binary(basetext) or util.binary(atext) or util.binary(btext): |
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438 raise util.Abort(_("don't know how to merge binary files")) |
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439 Merge3Text.__init__(self, basetext, atext, btext, base, a, b) |
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440 |
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441 |
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442 def main(argv): |
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443 # as for diff3 and meld the syntax is "MINE BASE OTHER" |
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444 a = file(argv[1], 'rt').readlines() |
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445 base = file(argv[2], 'rt').readlines() |
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446 b = file(argv[3], 'rt').readlines() |
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447 |
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448 m3 = Merge3(base, a, b) |
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449 |
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450 #for sr in m3.find_sync_regions(): |
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451 # print sr |
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452 |
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453 # sys.stdout.writelines(m3.merge_lines(name_a=argv[1], name_b=argv[3])) |
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454 sys.stdout.writelines(m3.merge_annotated()) |
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455 |
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456 |
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457 if __name__ == '__main__': |
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458 import sys |
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459 sys.exit(main(sys.argv)) |