Mercurial > hg
annotate mercurial/simplemerge.py @ 32076:d7b698ae153b stable
help: explain how to access subtopics in internals
author | Matt DeVore <matvore@google.com> |
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date | Wed, 19 Apr 2017 17:04:22 -0700 |
parents | 35284f933518 |
children | c31d45623304 |
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 import os |
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22 |
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23 from .i18n import _ |
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24 from . import ( |
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25 error, |
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26 mdiff, |
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27 util, |
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28 vfs as vfsmod, |
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29 ) |
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30 |
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31 class CantReprocessAndShowBase(Exception): |
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32 pass |
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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 def compare_range(a, astart, aend, b, bstart, bend): |
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57 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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58 """ |
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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(xrange(astart, aend), xrange(bstart, bend)): |
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62 if a[ia] != b[ib]: |
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63 return False |
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64 else: |
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65 return True |
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66 |
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67 class Merge3Text(object): |
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68 """3-way merge of texts. |
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69 |
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70 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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71 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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72 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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73 self.basetext = basetext |
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74 self.atext = atext |
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75 self.btext = btext |
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76 if base is None: |
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77 base = mdiff.splitnewlines(basetext) |
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78 if a is None: |
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79 a = mdiff.splitnewlines(atext) |
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80 if b is None: |
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81 b = mdiff.splitnewlines(btext) |
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82 self.base = base |
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83 self.a = a |
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84 self.b = b |
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85 |
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86 def merge_lines(self, |
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87 name_a=None, |
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88 name_b=None, |
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89 name_base=None, |
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90 start_marker='<<<<<<<', |
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91 mid_marker='=======', |
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92 end_marker='>>>>>>>', |
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93 base_marker=None, |
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94 localorother=None, |
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95 minimize=False): |
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96 """Return merge in cvs-like form. |
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97 """ |
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98 self.conflicts = False |
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99 newline = '\n' |
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100 if len(self.a) > 0: |
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101 if self.a[0].endswith('\r\n'): |
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102 newline = '\r\n' |
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103 elif self.a[0].endswith('\r'): |
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104 newline = '\r' |
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105 if name_a and start_marker: |
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106 start_marker = start_marker + ' ' + name_a |
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107 if name_b and end_marker: |
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108 end_marker = end_marker + ' ' + name_b |
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109 if name_base and base_marker: |
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110 base_marker = base_marker + ' ' + name_base |
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111 merge_regions = self.merge_regions() |
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112 if minimize: |
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113 merge_regions = self.minimize(merge_regions) |
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114 for t in merge_regions: |
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115 what = t[0] |
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116 if what == 'unchanged': |
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117 for i in range(t[1], t[2]): |
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118 yield self.base[i] |
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119 elif what == 'a' or what == 'same': |
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120 for i in range(t[1], t[2]): |
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121 yield self.a[i] |
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122 elif what == 'b': |
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123 for i in range(t[1], t[2]): |
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124 yield self.b[i] |
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125 elif what == 'conflict': |
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126 if localorother == 'local': |
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127 for i in range(t[3], t[4]): |
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128 yield self.a[i] |
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129 elif localorother == 'other': |
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130 for i in range(t[5], t[6]): |
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131 yield self.b[i] |
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132 else: |
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133 self.conflicts = True |
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134 if start_marker is not None: |
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135 yield start_marker + newline |
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136 for i in range(t[3], t[4]): |
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137 yield self.a[i] |
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138 if base_marker is not None: |
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139 yield base_marker + newline |
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140 for i in range(t[1], t[2]): |
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141 yield self.base[i] |
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142 if mid_marker is not None: |
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143 yield mid_marker + newline |
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144 for i in range(t[5], t[6]): |
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145 yield self.b[i] |
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146 if end_marker is not None: |
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147 yield end_marker + newline |
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148 else: |
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149 raise ValueError(what) |
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150 |
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151 def merge_groups(self): |
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152 """Yield sequence of line groups. Each one is a tuple: |
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153 |
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154 'unchanged', lines |
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155 Lines unchanged from base |
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156 |
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157 'a', lines |
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158 Lines taken from a |
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159 |
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160 'same', lines |
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161 Lines taken from a (and equal to b) |
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162 |
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163 'b', lines |
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164 Lines taken from b |
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165 |
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166 'conflict', base_lines, a_lines, b_lines |
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167 Lines from base were changed to either a or b and conflict. |
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168 """ |
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169 for t in self.merge_regions(): |
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170 what = t[0] |
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171 if what == 'unchanged': |
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172 yield what, self.base[t[1]:t[2]] |
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173 elif what == 'a' or what == 'same': |
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174 yield what, self.a[t[1]:t[2]] |
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175 elif what == 'b': |
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176 yield what, self.b[t[1]:t[2]] |
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177 elif what == 'conflict': |
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178 yield (what, |
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179 self.base[t[1]:t[2]], |
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180 self.a[t[3]:t[4]], |
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181 self.b[t[5]:t[6]]) |
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182 else: |
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183 raise ValueError(what) |
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184 |
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185 def merge_regions(self): |
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186 """Return sequences of matching and conflicting regions. |
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187 |
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188 This returns tuples, where the first value says what kind we |
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189 have: |
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190 |
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191 'unchanged', start, end |
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192 Take a region of base[start:end] |
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193 |
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194 'same', astart, aend |
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195 b and a are different from base but give the same result |
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196 |
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197 'a', start, end |
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198 Non-clashing insertion from a[start:end] |
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199 |
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200 'conflict', zstart, zend, astart, aend, bstart, bend |
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201 Conflict between a and b, with z as common ancestor |
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202 |
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203 Method is as follows: |
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204 |
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205 The two sequences align only on regions which match the base |
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206 and both descendants. These are found by doing a two-way diff |
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207 of each one against the base, and then finding the |
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208 intersections between those regions. These "sync regions" |
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209 are by definition unchanged in both and easily dealt with. |
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210 |
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211 The regions in between can be in any of three cases: |
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212 conflicted, or changed on only one side. |
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213 """ |
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214 |
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215 # section a[0:ia] has been disposed of, etc |
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216 iz = ia = ib = 0 |
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217 |
16683 | 218 for region in self.find_sync_regions(): |
219 zmatch, zend, amatch, aend, bmatch, bend = region | |
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220 #print 'match base [%d:%d]' % (zmatch, zend) |
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221 |
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222 matchlen = zend - zmatch |
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223 assert matchlen >= 0 |
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224 assert matchlen == (aend - amatch) |
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225 assert matchlen == (bend - bmatch) |
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226 |
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227 len_a = amatch - ia |
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228 len_b = bmatch - ib |
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229 len_base = zmatch - iz |
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230 assert len_a >= 0 |
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231 assert len_b >= 0 |
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232 assert len_base >= 0 |
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233 |
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234 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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235 |
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236 if len_a or len_b: |
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237 # try to avoid actually slicing the lists |
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238 equal_a = compare_range(self.a, ia, amatch, |
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239 self.base, iz, zmatch) |
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240 equal_b = compare_range(self.b, ib, bmatch, |
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241 self.base, iz, zmatch) |
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242 same = compare_range(self.a, ia, amatch, |
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243 self.b, ib, bmatch) |
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244 |
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245 if same: |
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246 yield 'same', ia, amatch |
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247 elif equal_a and not equal_b: |
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248 yield 'b', ib, bmatch |
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249 elif equal_b and not equal_a: |
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250 yield 'a', ia, amatch |
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251 elif not equal_a and not equal_b: |
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252 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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253 else: |
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254 raise AssertionError("can't handle a=b=base but unmatched") |
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255 |
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256 ia = amatch |
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257 ib = bmatch |
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258 iz = zmatch |
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259 |
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260 # if the same part of the base was deleted on both sides |
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261 # that's OK, we can just skip it. |
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262 |
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263 |
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264 if matchlen > 0: |
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265 assert ia == amatch |
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266 assert ib == bmatch |
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267 assert iz == zmatch |
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268 |
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269 yield 'unchanged', zmatch, zend |
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270 iz = zend |
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271 ia = aend |
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272 ib = bend |
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273 |
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274 def minimize(self, merge_regions): |
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275 """Trim conflict regions of lines where A and B sides match. |
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276 |
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277 Lines where both A and B have made the same changes at the beginning |
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278 or the end of each merge region are eliminated from the conflict |
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279 region and are instead considered the same. |
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280 """ |
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281 for region in merge_regions: |
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282 if region[0] != "conflict": |
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283 yield region |
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284 continue |
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285 issue, z1, z2, a1, a2, b1, b2 = region |
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286 alen = a2 - a1 |
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287 blen = b2 - b1 |
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288 |
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289 # find matches at the front |
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290 ii = 0 |
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291 while ii < alen and ii < blen and \ |
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292 self.a[a1 + ii] == self.b[b1 + ii]: |
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293 ii += 1 |
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294 startmatches = ii |
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295 |
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296 # find matches at the end |
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297 ii = 0 |
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298 while ii < alen and ii < blen and \ |
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299 self.a[a2 - ii - 1] == self.b[b2 - ii - 1]: |
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300 ii += 1 |
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301 endmatches = ii |
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302 |
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303 if startmatches > 0: |
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304 yield 'same', a1, a1 + startmatches |
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305 |
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306 yield ('conflict', z1, z2, |
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307 a1 + startmatches, a2 - endmatches, |
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308 b1 + startmatches, b2 - endmatches) |
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309 |
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310 if endmatches > 0: |
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311 yield 'same', a2 - endmatches, a2 |
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312 |
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313 def find_sync_regions(self): |
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314 """Return a list of sync regions, where both descendants match the base. |
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315 |
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316 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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317 always a zero-length sync region at the end of all the files. |
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318 """ |
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319 |
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320 ia = ib = 0 |
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321 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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322 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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323 len_a = len(amatches) |
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324 len_b = len(bmatches) |
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325 |
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326 sl = [] |
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327 |
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328 while ia < len_a and ib < len_b: |
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329 abase, amatch, alen = amatches[ia] |
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330 bbase, bmatch, blen = bmatches[ib] |
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331 |
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332 # there is an unconflicted block at i; how long does it |
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333 # extend? until whichever one ends earlier. |
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334 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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335 if i: |
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336 intbase = i[0] |
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337 intend = i[1] |
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338 intlen = intend - intbase |
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339 |
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340 # found a match of base[i[0], i[1]]; this may be less than |
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341 # the region that matches in either one |
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342 assert intlen <= alen |
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343 assert intlen <= blen |
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344 assert abase <= intbase |
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345 assert bbase <= intbase |
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346 |
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347 asub = amatch + (intbase - abase) |
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348 bsub = bmatch + (intbase - bbase) |
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349 aend = asub + intlen |
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350 bend = bsub + intlen |
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351 |
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352 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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353 (self.base[intbase:intend], self.a[asub:aend]) |
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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, |
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358 asub, aend, |
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359 bsub, bend)) |
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360 |
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361 # advance whichever one ends first in the base text |
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362 if (abase + alen) < (bbase + blen): |
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363 ia += 1 |
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364 else: |
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365 ib += 1 |
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366 |
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367 intbase = len(self.base) |
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368 abase = len(self.a) |
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369 bbase = len(self.b) |
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370 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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371 |
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372 return sl |
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373 |
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374 def find_unconflicted(self): |
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375 """Return a list of ranges in base that are not conflicted.""" |
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376 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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377 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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378 |
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379 unc = [] |
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380 |
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381 while am and bm: |
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382 # there is an unconflicted block at i; how long does it |
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383 # extend? until whichever one ends earlier. |
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384 a1 = am[0][0] |
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385 a2 = a1 + am[0][2] |
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386 b1 = bm[0][0] |
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387 b2 = b1 + bm[0][2] |
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388 i = intersect((a1, a2), (b1, b2)) |
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389 if i: |
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390 unc.append(i) |
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391 |
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392 if a2 < b2: |
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393 del am[0] |
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394 else: |
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395 del bm[0] |
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396 |
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397 return unc |
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398 |
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399 def simplemerge(ui, local, base, other, **opts): |
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400 def readfile(filename): |
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401 f = open(filename, "rb") |
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402 text = f.read() |
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403 f.close() |
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404 if util.binary(text): |
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405 msg = _("%s looks like a binary file.") % filename |
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406 if not opts.get('quiet'): |
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407 ui.warn(_('warning: %s\n') % msg) |
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408 if not opts.get('text'): |
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409 raise error.Abort(msg) |
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410 return text |
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411 |
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412 mode = opts.get('mode','merge') |
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413 if mode == 'union': |
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414 name_a = None |
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415 name_b = None |
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416 name_base = None |
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417 else: |
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418 name_a = local |
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419 name_b = other |
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420 name_base = None |
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421 labels = opts.get('label', []) |
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422 if len(labels) > 0: |
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423 name_a = labels[0] |
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424 if len(labels) > 1: |
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425 name_b = labels[1] |
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426 if len(labels) > 2: |
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427 name_base = labels[2] |
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428 if len(labels) > 3: |
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429 raise error.Abort(_("can only specify three labels.")) |
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430 |
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431 try: |
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432 localtext = readfile(local) |
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433 basetext = readfile(base) |
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434 othertext = readfile(other) |
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435 except error.Abort: |
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436 return 1 |
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437 |
15381
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backout dbdb777502dc (issue3077) (issue3071)
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438 local = os.path.realpath(local) |
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439 if not opts.get('print'): |
31238
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vfs: use 'vfs' module directly in 'mercurial.simplemerge'
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440 opener = vfsmod.vfs(os.path.dirname(local)) |
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441 out = opener(os.path.basename(local), "w", atomictemp=True) |
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442 else: |
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443 out = ui.fout |
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444 |
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445 m3 = Merge3Text(basetext, localtext, othertext) |
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446 extrakwargs = { |
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447 "localorother": opts.get("localorother", None), |
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448 'minimize': True, |
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449 } |
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450 if mode == 'union': |
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451 extrakwargs['start_marker'] = None |
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452 extrakwargs['mid_marker'] = None |
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453 extrakwargs['end_marker'] = None |
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454 elif name_base is not None: |
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diff
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|
455 extrakwargs['base_marker'] = '|||||||' |
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456 extrakwargs['name_base'] = name_base |
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457 extrakwargs['minimize'] = False |
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458 for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs): |
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459 out.write(line) |
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460 |
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461 if not opts.get('print'): |
15057
774da7121fc9
atomictempfile: make close() consistent with other file-like objects.
Greg Ward <greg@gerg.ca>
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diff
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|
462 out.close() |
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463 |
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464 if m3.conflicts and not mode == 'union': |
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465 return 1 |