Mercurial > hg
annotate mercurial/simplemerge.py @ 48548:88a45330b290
simplemerge: rewrite `merge_lines()` using `merge_groups()`
Simple is better.
Differential Revision: https://phab.mercurial-scm.org/D11967
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 05 Jan 2022 11:34:54 -0800 |
parents | 374bf34c9ffd |
children | c91418480cb0 |
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_lines( |
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91 self, |
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92 name_a=None, |
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93 name_b=None, |
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94 name_base=None, |
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95 start_marker=b'<<<<<<<', |
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96 mid_marker=b'=======', |
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97 end_marker=b'>>>>>>>', |
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98 base_marker=None, |
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99 minimize=False, |
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100 ): |
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101 """Return merge in cvs-like form.""" |
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102 self.conflicts = False |
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103 newline = b'\n' |
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104 if len(self.a) > 0: |
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105 if self.a[0].endswith(b'\r\n'): |
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106 newline = b'\r\n' |
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107 elif self.a[0].endswith(b'\r'): |
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108 newline = b'\r' |
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109 if name_a and start_marker: |
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110 start_marker = start_marker + b' ' + name_a |
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111 if name_b and end_marker: |
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112 end_marker = end_marker + b' ' + name_b |
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113 if name_base and base_marker: |
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114 base_marker = base_marker + b' ' + name_base |
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115 merge_groups = self.merge_groups() |
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116 if minimize: |
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117 merge_groups = self.minimize(merge_groups) |
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118 for what, lines in merge_groups: |
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119 if what == b'conflict': |
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120 base_lines, a_lines, b_lines = lines |
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121 self.conflicts = True |
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122 if start_marker is not None: |
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123 yield start_marker + newline |
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124 for line in a_lines: |
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125 yield line |
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126 if base_marker is not None: |
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127 yield base_marker + newline |
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128 for line in base_lines: |
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129 yield line |
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130 if mid_marker is not None: |
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131 yield mid_marker + newline |
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132 for line in b_lines: |
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133 yield line |
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134 if end_marker is not None: |
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135 yield end_marker + newline |
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136 else: |
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137 for line in lines: |
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138 yield line |
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139 |
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140 def merge_groups(self): |
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141 """Yield sequence of line groups. Each one is a tuple: |
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142 |
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143 'unchanged', lines |
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144 Lines unchanged from base |
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145 |
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146 'a', lines |
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147 Lines taken from a |
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148 |
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149 'same', lines |
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150 Lines taken from a (and equal to b) |
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151 |
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152 'b', lines |
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153 Lines taken from b |
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154 |
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155 'conflict', (base_lines, a_lines, b_lines) |
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156 Lines from base were changed to either a or b and conflict. |
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157 """ |
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158 for t in self.merge_regions(): |
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159 what = t[0] |
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160 if what == b'unchanged': |
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161 yield what, self.base[t[1] : t[2]] |
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162 elif what == b'a' or what == b'same': |
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163 yield what, self.a[t[1] : t[2]] |
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164 elif what == b'b': |
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165 yield what, self.b[t[1] : t[2]] |
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166 elif what == b'conflict': |
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167 yield ( |
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168 what, |
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169 ( |
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170 self.base[t[1] : t[2]], |
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171 self.a[t[3] : t[4]], |
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172 self.b[t[5] : t[6]], |
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173 ), |
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174 ) |
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175 else: |
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176 raise ValueError(what) |
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177 |
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178 def merge_regions(self): |
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179 """Return sequences of matching and conflicting regions. |
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180 |
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181 This returns tuples, where the first value says what kind we |
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182 have: |
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183 |
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184 'unchanged', start, end |
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185 Take a region of base[start:end] |
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186 |
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187 'same', astart, aend |
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188 b and a are different from base but give the same result |
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189 |
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190 'a', start, end |
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191 Non-clashing insertion from a[start:end] |
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192 |
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193 'conflict', zstart, zend, astart, aend, bstart, bend |
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194 Conflict between a and b, with z as common ancestor |
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195 |
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196 Method is as follows: |
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197 |
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198 The two sequences align only on regions which match the base |
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199 and both descendants. These are found by doing a two-way diff |
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200 of each one against the base, and then finding the |
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201 intersections between those regions. These "sync regions" |
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202 are by definition unchanged in both and easily dealt with. |
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203 |
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204 The regions in between can be in any of three cases: |
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205 conflicted, or changed on only one side. |
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206 """ |
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207 |
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208 # section a[0:ia] has been disposed of, etc |
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209 iz = ia = ib = 0 |
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210 |
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212 zmatch, zend, amatch, aend, bmatch, bend = region | |
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213 # print 'match base [%d:%d]' % (zmatch, zend) |
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214 |
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215 matchlen = zend - zmatch |
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216 assert matchlen >= 0 |
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217 assert matchlen == (aend - amatch) |
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218 assert matchlen == (bend - bmatch) |
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219 |
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220 len_a = amatch - ia |
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221 len_b = bmatch - ib |
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222 len_base = zmatch - iz |
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223 assert len_a >= 0 |
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224 assert len_b >= 0 |
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225 assert len_base >= 0 |
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226 |
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227 # print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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228 |
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229 if len_a or len_b: |
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230 # try to avoid actually slicing the lists |
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231 equal_a = compare_range( |
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232 self.a, ia, amatch, self.base, iz, zmatch |
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233 ) |
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234 equal_b = compare_range( |
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235 self.b, ib, bmatch, self.base, iz, zmatch |
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236 ) |
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237 same = compare_range(self.a, ia, amatch, self.b, ib, bmatch) |
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238 |
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239 if same: |
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240 yield b'same', ia, amatch |
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241 elif equal_a and not equal_b: |
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242 yield b'b', ib, bmatch |
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243 elif equal_b and not equal_a: |
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244 yield b'a', ia, amatch |
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245 elif not equal_a and not equal_b: |
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246 yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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247 else: |
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248 raise AssertionError(b"can't handle a=b=base but unmatched") |
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249 |
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250 ia = amatch |
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251 ib = bmatch |
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252 iz = zmatch |
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253 |
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254 # if the same part of the base was deleted on both sides |
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255 # that's OK, we can just skip it. |
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256 |
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257 if matchlen > 0: |
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258 assert ia == amatch |
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259 assert ib == bmatch |
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260 assert iz == zmatch |
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261 |
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262 yield b'unchanged', zmatch, zend |
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263 iz = zend |
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264 ia = aend |
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265 ib = bend |
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266 |
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267 def minimize(self, merge_groups): |
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268 """Trim conflict regions of lines where A and B sides match. |
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269 |
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270 Lines where both A and B have made the same changes at the beginning |
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271 or the end of each merge region are eliminated from the conflict |
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272 region and are instead considered the same. |
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273 """ |
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274 for what, lines in merge_groups: |
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275 if what != b"conflict": |
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276 yield what, lines |
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277 continue |
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278 base_lines, a_lines, b_lines = lines |
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279 alen = len(a_lines) |
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280 blen = len(b_lines) |
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281 |
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282 # find matches at the front |
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283 ii = 0 |
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284 while ii < alen and ii < blen and a_lines[ii] == b_lines[ii]: |
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285 ii += 1 |
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286 startmatches = ii |
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287 |
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288 # find matches at the end |
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289 ii = 0 |
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290 while ( |
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291 ii < alen and ii < blen and a_lines[-ii - 1] == b_lines[-ii - 1] |
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292 ): |
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293 ii += 1 |
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294 endmatches = ii |
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295 |
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296 if startmatches > 0: |
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297 yield b'same', a_lines[:startmatches] |
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298 |
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299 yield ( |
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300 b'conflict', |
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301 ( |
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302 base_lines, |
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303 a_lines[startmatches : alen - endmatches], |
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304 b_lines[startmatches : blen - endmatches], |
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305 ), |
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306 ) |
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307 |
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308 if endmatches > 0: |
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309 yield b'same', a_lines[alen - endmatches :] |
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310 |
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311 def find_sync_regions(self): |
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312 """Return a list of sync regions, where both descendants match the base. |
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313 |
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314 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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315 always a zero-length sync region at the end of all the files. |
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316 """ |
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317 |
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318 ia = ib = 0 |
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319 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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320 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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321 len_a = len(amatches) |
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322 len_b = len(bmatches) |
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323 |
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324 sl = [] |
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325 |
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326 while ia < len_a and ib < len_b: |
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327 abase, amatch, alen = amatches[ia] |
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328 bbase, bmatch, blen = bmatches[ib] |
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329 |
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330 # there is an unconflicted block at i; how long does it |
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331 # extend? until whichever one ends earlier. |
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332 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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333 if i: |
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334 intbase = i[0] |
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335 intend = i[1] |
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336 intlen = intend - intbase |
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337 |
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338 # found a match of base[i[0], i[1]]; this may be less than |
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339 # the region that matches in either one |
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340 assert intlen <= alen |
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341 assert intlen <= blen |
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342 assert abase <= intbase |
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343 assert bbase <= intbase |
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344 |
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345 asub = amatch + (intbase - abase) |
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346 bsub = bmatch + (intbase - bbase) |
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347 aend = asub + intlen |
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348 bend = bsub + intlen |
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349 |
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350 assert self.base[intbase:intend] == self.a[asub:aend], ( |
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351 self.base[intbase:intend], |
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352 self.a[asub:aend], |
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353 ) |
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354 |
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355 assert self.base[intbase:intend] == self.b[bsub:bend] |
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356 |
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357 sl.append((intbase, intend, asub, aend, bsub, bend)) |
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358 |
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359 # advance whichever one ends first in the base text |
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360 if (abase + alen) < (bbase + blen): |
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361 ia += 1 |
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362 else: |
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363 ib += 1 |
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364 |
4362
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365 intbase = len(self.base) |
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366 abase = len(self.a) |
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367 bbase = len(self.b) |
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368 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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369 |
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370 return sl |
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371 |
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372 |
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373 def _verifytext(text, path, ui, opts): |
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374 """verifies that text is non-binary (unless opts[text] is passed, |
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375 then we just warn)""" |
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376 if stringutil.binary(text): |
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377 msg = _(b"%s looks like a binary file.") % path |
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378 if not opts.get('quiet'): |
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379 ui.warn(_(b'warning: %s\n') % msg) |
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380 if not opts.get('text'): |
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381 raise error.Abort(msg) |
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382 return text |
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383 |
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384 |
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385 def _picklabels(defaults, overrides): |
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386 if len(overrides) > 3: |
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387 raise error.Abort(_(b"can only specify three labels.")) |
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388 result = defaults[:] |
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389 for i, override in enumerate(overrides): |
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390 result[i] = override |
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391 return result |
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392 |
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393 |
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394 def _mergediff(m3, name_a, name_b, name_base): |
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395 lines = [] |
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396 conflicts = False |
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397 for what, group_lines in m3.merge_groups(): |
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398 if what == b'conflict': |
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399 base_lines, a_lines, b_lines = group_lines |
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400 base_text = b''.join(base_lines) |
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401 b_blocks = list( |
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402 mdiff.allblocks( |
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403 base_text, |
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404 b''.join(b_lines), |
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405 lines1=base_lines, |
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406 lines2=b_lines, |
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407 ) |
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408 ) |
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409 a_blocks = list( |
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410 mdiff.allblocks( |
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411 base_text, |
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412 b''.join(a_lines), |
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413 lines1=base_lines, |
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414 lines2=b_lines, |
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415 ) |
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416 ) |
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417 |
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418 def matching_lines(blocks): |
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419 return sum( |
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420 block[1] - block[0] |
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421 for block, kind in blocks |
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422 if kind == b'=' |
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423 ) |
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424 |
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425 def diff_lines(blocks, lines1, lines2): |
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426 for block, kind in blocks: |
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427 if kind == b'=': |
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428 for line in lines1[block[0] : block[1]]: |
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429 yield b' ' + line |
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430 else: |
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431 for line in lines1[block[0] : block[1]]: |
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432 yield b'-' + line |
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433 for line in lines2[block[2] : block[3]]: |
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434 yield b'+' + line |
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435 |
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436 lines.append(b"<<<<<<<\n") |
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437 if matching_lines(a_blocks) < matching_lines(b_blocks): |
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438 lines.append(b"======= %s\n" % name_a) |
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439 lines.extend(a_lines) |
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440 lines.append(b"------- %s\n" % name_base) |
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441 lines.append(b"+++++++ %s\n" % name_b) |
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442 lines.extend(diff_lines(b_blocks, base_lines, b_lines)) |
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443 else: |
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444 lines.append(b"------- %s\n" % name_base) |
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445 lines.append(b"+++++++ %s\n" % name_a) |
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446 lines.extend(diff_lines(a_blocks, base_lines, a_lines)) |
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447 lines.append(b"======= %s\n" % name_b) |
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448 lines.extend(b_lines) |
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449 lines.append(b">>>>>>>\n") |
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450 conflicts = True |
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451 else: |
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|
452 lines.extend(group_lines) |
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453 return lines, conflicts |
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|
454 |
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455 |
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456 def _resolve(m3, sides): |
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457 lines = [] |
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458 for what, group_lines in m3.merge_groups(): |
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459 if what == b'conflict': |
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|
460 for side in sides: |
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461 lines.extend(group_lines[side]) |
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462 else: |
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463 lines.extend(group_lines) |
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464 return lines |
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465 |
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|
466 |
34049
6330df9d6393
simplemerge: remove unused `repo` parameter
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33933
diff
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|
467 def simplemerge(ui, localctx, basectx, otherctx, **opts): |
33828
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simplemerge: use contexts to read file data from, if passed
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|
468 """Performs the simplemerge algorithm. |
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|
469 |
33907
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|
470 The merged result is written into `localctx`. |
33905
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471 """ |
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472 |
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473 def readctx(ctx): |
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474 # Merges were always run in the working copy before, which means |
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475 # they used decoded data, if the user defined any repository |
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476 # filters. |
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477 # |
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478 # Maintain that behavior today for BC, though perhaps in the future |
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479 # it'd be worth considering whether merging encoded data (what the |
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480 # repository usually sees) might be more useful. |
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481 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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482 |
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483 try: |
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484 localtext = readctx(localctx) |
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485 basetext = readctx(basectx) |
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486 othertext = readctx(otherctx) |
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487 except error.Abort: |
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488 return 1 |
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489 |
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490 m3 = Merge3Text(basetext, localtext, othertext) |
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491 conflicts = False |
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492 mode = opts.get('mode', b'merge') |
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493 if mode == b'union': |
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494 lines = _resolve(m3, (1, 2)) |
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495 elif mode == b'local': |
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496 lines = _resolve(m3, (1,)) |
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497 elif mode == b'other': |
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498 lines = _resolve(m3, (2,)) |
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499 else: |
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500 name_a, name_b, name_base = _picklabels( |
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501 [localctx.path(), otherctx.path(), None], opts.get('label', []) |
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502 ) |
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503 if mode == b'mergediff': |
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504 lines, conflicts = _mergediff(m3, name_a, name_b, name_base) |
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505 else: |
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506 extrakwargs = { |
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507 'minimize': True, |
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508 } |
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509 if name_base is not None: |
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510 extrakwargs['base_marker'] = b'|||||||' |
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511 extrakwargs['name_base'] = name_base |
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512 extrakwargs['minimize'] = False |
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513 lines = list( |
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514 m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs) |
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515 ) |
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516 conflicts = m3.conflicts |
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517 |
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518 mergedtext = b''.join(lines) |
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519 if opts.get('print'): |
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520 ui.fout.write(mergedtext) |
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521 else: |
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522 # localctx.flags() already has the merged flags (done in |
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523 # mergestate.resolve()) |
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524 localctx.write(mergedtext, localctx.flags()) |
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525 |
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526 if conflicts: |
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527 return 1 |