Mercurial > hg
annotate mercurial/simplemerge.py @ 48563:ad0c6bf6f02e
simplemerge: make minimize() a free function
IMO, `Merge3Text` should be about merging text without knowing about
conflict markers. "Conflict minimization" is about making conflict
markers smaller, so it should be moved out. This patch does that. I'll
refactor it next.
Differential Revision: https://phab.mercurial-scm.org/D11980
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 11 Jan 2022 22:03:55 -0800 |
parents | 12ac4401ff7d |
children | c2537aec3bb6 |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 from .i18n import _ |
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22 from . import ( |
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23 error, |
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24 mdiff, |
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25 pycompat, |
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26 ) |
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27 from .utils import stringutil |
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28 |
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29 |
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30 class CantReprocessAndShowBase(Exception): |
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31 pass |
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32 |
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33 |
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34 def intersect(ra, rb): |
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35 """Given two ranges return the range where they intersect or None. |
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36 |
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37 >>> intersect((0, 10), (0, 6)) |
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38 (0, 6) |
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39 >>> intersect((0, 10), (5, 15)) |
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40 (5, 10) |
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41 >>> intersect((0, 10), (10, 15)) |
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42 >>> intersect((0, 9), (10, 15)) |
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43 >>> intersect((0, 9), (7, 15)) |
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44 (7, 9) |
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45 """ |
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46 assert ra[0] <= ra[1] |
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47 assert rb[0] <= rb[1] |
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48 |
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49 sa = max(ra[0], rb[0]) |
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50 sb = min(ra[1], rb[1]) |
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51 if sa < sb: |
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52 return sa, sb |
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53 else: |
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54 return None |
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55 |
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56 |
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57 def compare_range(a, astart, aend, b, bstart, bend): |
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58 """Compare a[astart:aend] == b[bstart:bend], without slicing.""" |
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59 if (aend - astart) != (bend - bstart): |
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60 return False |
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61 for ia, ib in zip( |
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62 pycompat.xrange(astart, aend), pycompat.xrange(bstart, bend) |
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63 ): |
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64 if a[ia] != b[ib]: |
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65 return False |
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66 else: |
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67 return True |
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68 |
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69 |
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70 class Merge3Text(object): |
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71 """3-way merge of texts. |
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72 |
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73 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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74 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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75 |
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76 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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77 self.basetext = basetext |
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78 self.atext = atext |
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79 self.btext = btext |
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80 if base is None: |
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81 base = mdiff.splitnewlines(basetext) |
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82 if a is None: |
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83 a = mdiff.splitnewlines(atext) |
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84 if b is None: |
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85 b = mdiff.splitnewlines(btext) |
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86 self.base = base |
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87 self.a = a |
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88 self.b = b |
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89 |
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90 def merge_groups(self): |
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91 """Yield sequence of line groups. Each one is a tuple: |
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92 |
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93 'unchanged', lines |
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94 Lines unchanged from base |
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95 |
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96 'a', lines |
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97 Lines taken from a |
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98 |
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99 'same', lines |
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100 Lines taken from a (and equal to b) |
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101 |
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102 'b', lines |
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103 Lines taken from b |
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104 |
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105 'conflict', (base_lines, a_lines, b_lines) |
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106 Lines from base were changed to either a or b and conflict. |
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107 """ |
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108 for t in self.merge_regions(): |
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109 what = t[0] |
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110 if what == b'unchanged': |
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111 yield what, self.base[t[1] : t[2]] |
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112 elif what == b'a' or what == b'same': |
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113 yield what, self.a[t[1] : t[2]] |
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114 elif what == b'b': |
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115 yield what, self.b[t[1] : t[2]] |
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116 elif what == b'conflict': |
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117 yield ( |
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118 what, |
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119 ( |
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120 self.base[t[1] : t[2]], |
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121 self.a[t[3] : t[4]], |
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122 self.b[t[5] : t[6]], |
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123 ), |
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124 ) |
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125 else: |
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126 raise ValueError(what) |
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127 |
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128 def merge_regions(self): |
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129 """Return sequences of matching and conflicting regions. |
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130 |
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131 This returns tuples, where the first value says what kind we |
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132 have: |
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133 |
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134 'unchanged', start, end |
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135 Take a region of base[start:end] |
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136 |
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137 'same', astart, aend |
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138 b and a are different from base but give the same result |
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139 |
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140 'a', start, end |
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141 Non-clashing insertion from a[start:end] |
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142 |
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143 'conflict', zstart, zend, astart, aend, bstart, bend |
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144 Conflict between a and b, with z as common ancestor |
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145 |
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146 Method is as follows: |
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147 |
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148 The two sequences align only on regions which match the base |
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149 and both descendants. These are found by doing a two-way diff |
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150 of each one against the base, and then finding the |
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151 intersections between those regions. These "sync regions" |
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152 are by definition unchanged in both and easily dealt with. |
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153 |
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154 The regions in between can be in any of three cases: |
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155 conflicted, or changed on only one side. |
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156 """ |
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157 |
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158 # section a[0:ia] has been disposed of, etc |
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159 iz = ia = ib = 0 |
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160 |
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162 zmatch, zend, amatch, aend, bmatch, bend = region | |
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163 # print 'match base [%d:%d]' % (zmatch, zend) |
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164 |
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165 matchlen = zend - zmatch |
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166 assert matchlen >= 0 |
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167 assert matchlen == (aend - amatch) |
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168 assert matchlen == (bend - bmatch) |
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169 |
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170 len_a = amatch - ia |
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171 len_b = bmatch - ib |
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172 len_base = zmatch - iz |
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173 assert len_a >= 0 |
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174 assert len_b >= 0 |
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175 assert len_base >= 0 |
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176 |
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177 # print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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178 |
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179 if len_a or len_b: |
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180 # try to avoid actually slicing the lists |
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181 equal_a = compare_range( |
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182 self.a, ia, amatch, self.base, iz, zmatch |
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183 ) |
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184 equal_b = compare_range( |
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185 self.b, ib, bmatch, self.base, iz, zmatch |
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186 ) |
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187 same = compare_range(self.a, ia, amatch, self.b, ib, bmatch) |
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188 |
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189 if same: |
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190 yield b'same', ia, amatch |
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191 elif equal_a and not equal_b: |
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192 yield b'b', ib, bmatch |
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193 elif equal_b and not equal_a: |
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194 yield b'a', ia, amatch |
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195 elif not equal_a and not equal_b: |
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196 yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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197 else: |
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198 raise AssertionError(b"can't handle a=b=base but unmatched") |
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199 |
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200 ia = amatch |
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201 ib = bmatch |
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202 iz = zmatch |
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203 |
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204 # if the same part of the base was deleted on both sides |
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205 # that's OK, we can just skip it. |
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206 |
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207 if matchlen > 0: |
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208 assert ia == amatch |
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209 assert ib == bmatch |
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210 assert iz == zmatch |
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211 |
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212 yield b'unchanged', zmatch, zend |
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213 iz = zend |
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214 ia = aend |
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215 ib = bend |
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216 |
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217 def find_sync_regions(self): |
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218 """Return a list of sync regions, where both descendants match the base. |
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219 |
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220 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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221 always a zero-length sync region at the end of all the files. |
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222 """ |
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223 |
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224 ia = ib = 0 |
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225 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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226 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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227 len_a = len(amatches) |
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228 len_b = len(bmatches) |
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229 |
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230 sl = [] |
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231 |
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232 while ia < len_a and ib < len_b: |
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233 abase, amatch, alen = amatches[ia] |
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234 bbase, bmatch, blen = bmatches[ib] |
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235 |
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236 # there is an unconflicted block at i; how long does it |
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237 # extend? until whichever one ends earlier. |
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238 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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239 if i: |
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240 intbase = i[0] |
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241 intend = i[1] |
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242 intlen = intend - intbase |
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243 |
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244 # found a match of base[i[0], i[1]]; this may be less than |
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245 # the region that matches in either one |
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246 assert intlen <= alen |
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247 assert intlen <= blen |
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248 assert abase <= intbase |
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249 assert bbase <= intbase |
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250 |
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251 asub = amatch + (intbase - abase) |
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252 bsub = bmatch + (intbase - bbase) |
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253 aend = asub + intlen |
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254 bend = bsub + intlen |
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255 |
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256 assert self.base[intbase:intend] == self.a[asub:aend], ( |
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257 self.base[intbase:intend], |
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258 self.a[asub:aend], |
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259 ) |
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260 |
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261 assert self.base[intbase:intend] == self.b[bsub:bend] |
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262 |
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263 sl.append((intbase, intend, asub, aend, bsub, bend)) |
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264 |
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265 # advance whichever one ends first in the base text |
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266 if (abase + alen) < (bbase + blen): |
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267 ia += 1 |
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268 else: |
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269 ib += 1 |
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270 |
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271 intbase = len(self.base) |
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272 abase = len(self.a) |
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273 bbase = len(self.b) |
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274 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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275 |
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276 return sl |
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277 |
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278 |
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279 def _verifytext(text, path, ui, opts): |
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280 """verifies that text is non-binary (unless opts[text] is passed, |
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281 then we just warn)""" |
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282 if stringutil.binary(text): |
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283 msg = _(b"%s looks like a binary file.") % path |
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284 if not opts.get('quiet'): |
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285 ui.warn(_(b'warning: %s\n') % msg) |
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286 if not opts.get('text'): |
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287 raise error.Abort(msg) |
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288 return text |
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289 |
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290 |
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291 def _picklabels(overrides): |
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292 if len(overrides) > 3: |
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293 raise error.Abort(_(b"can only specify three labels.")) |
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294 result = [None, None, None] |
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295 for i, override in enumerate(overrides): |
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296 result[i] = override |
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297 return result |
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298 |
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299 |
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300 def _detect_newline(m3): |
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301 if len(m3.a) > 0: |
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302 if m3.a[0].endswith(b'\r\n'): |
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303 return b'\r\n' |
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304 elif m3.a[0].endswith(b'\r'): |
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305 return b'\r' |
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306 return b'\n' |
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307 |
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308 |
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309 def _minimize(merge_groups): |
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310 """Trim conflict regions of lines where A and B sides match. |
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311 |
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312 Lines where both A and B have made the same changes at the beginning |
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313 or the end of each merge region are eliminated from the conflict |
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314 region and are instead considered the same. |
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315 """ |
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316 for what, lines in merge_groups: |
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317 if what != b"conflict": |
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318 yield what, lines |
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319 continue |
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320 base_lines, a_lines, b_lines = lines |
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321 alen = len(a_lines) |
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322 blen = len(b_lines) |
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323 |
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324 # find matches at the front |
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325 ii = 0 |
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326 while ii < alen and ii < blen and a_lines[ii] == b_lines[ii]: |
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327 ii += 1 |
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328 startmatches = ii |
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329 |
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330 # find matches at the end |
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331 ii = 0 |
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332 while ii < alen and ii < blen and a_lines[-ii - 1] == b_lines[-ii - 1]: |
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333 ii += 1 |
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334 endmatches = ii |
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335 |
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336 if startmatches > 0: |
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337 yield b'same', a_lines[:startmatches] |
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338 |
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339 yield ( |
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340 b'conflict', |
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341 ( |
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342 base_lines, |
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343 a_lines[startmatches : alen - endmatches], |
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344 b_lines[startmatches : blen - endmatches], |
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345 ), |
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346 ) |
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347 |
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348 if endmatches > 0: |
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349 yield b'same', a_lines[alen - endmatches :] |
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350 |
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351 |
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352 def render_minimized( |
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353 m3, |
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354 name_a=None, |
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355 name_b=None, |
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356 start_marker=b'<<<<<<<', |
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357 mid_marker=b'=======', |
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358 end_marker=b'>>>>>>>', |
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359 ): |
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360 """Return merge in cvs-like form.""" |
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361 newline = _detect_newline(m3) |
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362 conflicts = False |
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363 if name_a: |
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364 start_marker = start_marker + b' ' + name_a |
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365 if name_b: |
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366 end_marker = end_marker + b' ' + name_b |
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367 merge_groups = m3.merge_groups() |
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368 merge_groups = _minimize(merge_groups) |
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369 lines = [] |
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370 for what, group_lines in merge_groups: |
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371 if what == b'conflict': |
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372 base_lines, a_lines, b_lines = group_lines |
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373 conflicts = True |
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374 lines.append(start_marker + newline) |
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375 lines.extend(a_lines) |
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376 lines.append(mid_marker + newline) |
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377 lines.extend(b_lines) |
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378 lines.append(end_marker + newline) |
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379 else: |
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380 lines.extend(group_lines) |
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381 return lines, conflicts |
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382 |
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383 |
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384 def render_merge3(m3, name_a, name_b, name_base): |
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385 """Render conflicts as 3-way conflict markers.""" |
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386 newline = _detect_newline(m3) |
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387 conflicts = False |
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388 lines = [] |
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389 for what, group_lines in m3.merge_groups(): |
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390 if what == b'conflict': |
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391 base_lines, a_lines, b_lines = group_lines |
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392 conflicts = True |
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393 lines.append(b'<<<<<<< ' + name_a + newline) |
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394 lines.extend(a_lines) |
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395 lines.append(b'||||||| ' + name_base + newline) |
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396 lines.extend(base_lines) |
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397 lines.append(b'=======' + newline) |
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398 lines.extend(b_lines) |
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399 lines.append(b'>>>>>>> ' + name_b + newline) |
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400 else: |
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401 lines.extend(group_lines) |
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402 return lines, conflicts |
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403 |
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404 |
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405 def render_mergediff(m3, name_a, name_b, name_base): |
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406 """Render conflicts as conflict markers with one snapshot and one diff.""" |
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407 newline = _detect_newline(m3) |
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408 lines = [] |
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409 conflicts = False |
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410 for what, group_lines in m3.merge_groups(): |
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411 if what == b'conflict': |
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412 base_lines, a_lines, b_lines = group_lines |
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413 base_text = b''.join(base_lines) |
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414 b_blocks = list( |
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415 mdiff.allblocks( |
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416 base_text, |
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417 b''.join(b_lines), |
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418 lines1=base_lines, |
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419 lines2=b_lines, |
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420 ) |
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421 ) |
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422 a_blocks = list( |
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423 mdiff.allblocks( |
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424 base_text, |
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425 b''.join(a_lines), |
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426 lines1=base_lines, |
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427 lines2=b_lines, |
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428 ) |
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429 ) |
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430 |
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431 def matching_lines(blocks): |
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432 return sum( |
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433 block[1] - block[0] |
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434 for block, kind in blocks |
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435 if kind == b'=' |
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436 ) |
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437 |
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438 def diff_lines(blocks, lines1, lines2): |
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439 for block, kind in blocks: |
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440 if kind == b'=': |
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441 for line in lines1[block[0] : block[1]]: |
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442 yield b' ' + line |
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443 else: |
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444 for line in lines1[block[0] : block[1]]: |
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445 yield b'-' + line |
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446 for line in lines2[block[2] : block[3]]: |
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447 yield b'+' + line |
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448 |
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449 lines.append(b"<<<<<<<" + newline) |
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450 if matching_lines(a_blocks) < matching_lines(b_blocks): |
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451 lines.append(b"======= " + name_a + newline) |
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452 lines.extend(a_lines) |
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453 lines.append(b"------- " + name_base + newline) |
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454 lines.append(b"+++++++ " + name_b + newline) |
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455 lines.extend(diff_lines(b_blocks, base_lines, b_lines)) |
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456 else: |
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457 lines.append(b"------- " + name_base + newline) |
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458 lines.append(b"+++++++ " + name_a + newline) |
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459 lines.extend(diff_lines(a_blocks, base_lines, a_lines)) |
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460 lines.append(b"======= " + name_b + newline) |
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461 lines.extend(b_lines) |
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462 lines.append(b">>>>>>>" + newline) |
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463 conflicts = True |
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464 else: |
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465 lines.extend(group_lines) |
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466 return lines, conflicts |
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467 |
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468 |
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469 def _resolve(m3, sides): |
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470 lines = [] |
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471 for what, group_lines in m3.merge_groups(): |
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472 if what == b'conflict': |
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473 for side in sides: |
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474 lines.extend(group_lines[side]) |
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475 else: |
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476 lines.extend(group_lines) |
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477 return lines |
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478 |
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479 |
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480 def simplemerge(ui, localctx, basectx, otherctx, **opts): |
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481 """Performs the simplemerge algorithm. |
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482 |
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483 The merged result is written into `localctx`. |
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484 """ |
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485 |
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486 def readctx(ctx): |
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487 # Merges were always run in the working copy before, which means |
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488 # they used decoded data, if the user defined any repository |
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489 # filters. |
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490 # |
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491 # Maintain that behavior today for BC, though perhaps in the future |
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492 # it'd be worth considering whether merging encoded data (what the |
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493 # repository usually sees) might be more useful. |
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494 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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495 |
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496 try: |
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497 localtext = readctx(localctx) |
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498 basetext = readctx(basectx) |
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499 othertext = readctx(otherctx) |
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500 except error.Abort: |
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501 return 1 |
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502 |
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503 m3 = Merge3Text(basetext, localtext, othertext) |
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504 conflicts = False |
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505 mode = opts.get('mode', b'merge') |
43077
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506 if mode == b'union': |
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507 lines = _resolve(m3, (1, 2)) |
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508 elif mode == b'local': |
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509 lines = _resolve(m3, (1,)) |
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510 elif mode == b'other': |
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511 lines = _resolve(m3, (2,)) |
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512 else: |
48560
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diff
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|
513 name_a, name_b, name_base = _picklabels(opts.get('label', [])) |
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514 if mode == b'mergediff': |
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diff
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515 lines, conflicts = render_mergediff(m3, name_a, name_b, name_base) |
48561
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516 elif mode == b'merge3': |
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517 lines, conflicts = render_merge3(m3, name_a, name_b, name_base) |
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diff
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518 else: |
48562
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parents:
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diff
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519 lines, conflicts = render_minimized(m3, name_a, name_b) |
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diff
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|
520 |
46100
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diff
changeset
|
521 mergedtext = b''.join(lines) |
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522 if opts.get('print'): |
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parents:
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523 ui.fout.write(mergedtext) |
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524 else: |
48507
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Martin von Zweigbergk <martinvonz@google.com>
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diff
changeset
|
525 # localctx.flags() already has the merged flags (done in |
58a3be48ddd2
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|
526 # mergestate.resolve()) |
58a3be48ddd2
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diff
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|
527 localctx.write(mergedtext, localctx.flags()) |
4364
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diff
changeset
|
528 |
48425
9e1f174d305b
simplemerge: set `conflicts` earlier for :union tool
Martin von Zweigbergk <martinvonz@google.com>
parents:
46843
diff
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|
529 if conflicts: |
4364
d5c3a70f8422
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diff
changeset
|
530 return 1 |