Mercurial > hg
annotate mercurial/simplemerge.py @ 13884:773a833ddbc6
bugzilla: convert a verbatim block to a field list
author | Martin Geisler <mg@aragost.com> |
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date | Tue, 05 Apr 2011 10:22:58 +0200 |
parents | 4cdaf1adafc8 |
children | d13913355390 3c65cdcf3ba6 |
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, write to the Free Software |
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15 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 # mbp: "you know that thing where cvs gives you conflict markers?" |
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18 # s: "i hate that." |
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19 |
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20 from i18n import _ |
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21 import util, mdiff |
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22 import sys, os |
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23 |
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24 class CantReprocessAndShowBase(Exception): |
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25 pass |
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26 |
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27 def intersect(ra, rb): |
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28 """Given two ranges return the range where they intersect or None. |
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29 |
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30 >>> intersect((0, 10), (0, 6)) |
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31 (0, 6) |
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32 >>> intersect((0, 10), (5, 15)) |
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33 (5, 10) |
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34 >>> intersect((0, 10), (10, 15)) |
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35 >>> intersect((0, 9), (10, 15)) |
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36 >>> intersect((0, 9), (7, 15)) |
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37 (7, 9) |
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38 """ |
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39 assert ra[0] <= ra[1] |
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40 assert rb[0] <= rb[1] |
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41 |
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42 sa = max(ra[0], rb[0]) |
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43 sb = min(ra[1], rb[1]) |
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44 if sa < sb: |
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45 return sa, sb |
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46 else: |
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47 return None |
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48 |
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49 def compare_range(a, astart, aend, b, bstart, bend): |
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50 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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51 """ |
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52 if (aend - astart) != (bend - bstart): |
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53 return False |
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54 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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55 if a[ia] != b[ib]: |
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56 return False |
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57 else: |
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58 return True |
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59 |
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60 class Merge3Text(object): |
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61 """3-way merge of texts. |
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62 |
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63 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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64 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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65 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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66 self.basetext = basetext |
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67 self.atext = atext |
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68 self.btext = btext |
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69 if base is None: |
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70 base = mdiff.splitnewlines(basetext) |
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71 if a is None: |
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72 a = mdiff.splitnewlines(atext) |
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73 if b is None: |
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74 b = mdiff.splitnewlines(btext) |
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75 self.base = base |
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76 self.a = a |
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77 self.b = b |
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78 |
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79 def merge_lines(self, |
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80 name_a=None, |
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81 name_b=None, |
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82 name_base=None, |
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83 start_marker='<<<<<<<', |
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84 mid_marker='=======', |
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85 end_marker='>>>>>>>', |
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86 base_marker=None, |
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87 reprocess=False): |
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88 """Return merge in cvs-like form. |
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89 """ |
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90 self.conflicts = False |
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91 newline = '\n' |
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92 if len(self.a) > 0: |
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93 if self.a[0].endswith('\r\n'): |
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94 newline = '\r\n' |
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95 elif self.a[0].endswith('\r'): |
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96 newline = '\r' |
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97 if base_marker and reprocess: |
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98 raise CantReprocessAndShowBase() |
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99 if name_a: |
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100 start_marker = start_marker + ' ' + name_a |
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101 if name_b: |
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102 end_marker = end_marker + ' ' + name_b |
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103 if name_base and base_marker: |
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104 base_marker = base_marker + ' ' + name_base |
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105 merge_regions = self.merge_regions() |
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106 if reprocess is True: |
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107 merge_regions = self.reprocess_merge_regions(merge_regions) |
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108 for t in merge_regions: |
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109 what = t[0] |
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110 if what == 'unchanged': |
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111 for i in range(t[1], t[2]): |
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112 yield self.base[i] |
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113 elif what == 'a' or what == 'same': |
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114 for i in range(t[1], t[2]): |
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115 yield self.a[i] |
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116 elif what == 'b': |
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117 for i in range(t[1], t[2]): |
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118 yield self.b[i] |
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119 elif what == 'conflict': |
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120 self.conflicts = True |
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121 yield start_marker + newline |
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122 for i in range(t[3], t[4]): |
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123 yield self.a[i] |
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124 if base_marker is not None: |
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125 yield base_marker + newline |
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126 for i in range(t[1], t[2]): |
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127 yield self.base[i] |
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128 yield mid_marker + newline |
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129 for i in range(t[5], t[6]): |
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130 yield self.b[i] |
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131 yield end_marker + newline |
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132 else: |
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133 raise ValueError(what) |
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134 |
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135 def merge_annotated(self): |
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136 """Return merge with conflicts, showing origin of lines. |
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137 |
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138 Most useful for debugging merge. |
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139 """ |
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140 for t in self.merge_regions(): |
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141 what = t[0] |
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142 if what == 'unchanged': |
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143 for i in range(t[1], t[2]): |
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144 yield 'u | ' + self.base[i] |
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145 elif what == 'a' or what == 'same': |
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146 for i in range(t[1], t[2]): |
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147 yield what[0] + ' | ' + self.a[i] |
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148 elif what == 'b': |
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149 for i in range(t[1], t[2]): |
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150 yield 'b | ' + self.b[i] |
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151 elif what == 'conflict': |
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152 yield '<<<<\n' |
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153 for i in range(t[3], t[4]): |
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154 yield 'A | ' + self.a[i] |
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155 yield '----\n' |
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156 for i in range(t[5], t[6]): |
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157 yield 'B | ' + self.b[i] |
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158 yield '>>>>\n' |
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159 else: |
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160 raise ValueError(what) |
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161 |
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162 def merge_groups(self): |
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163 """Yield sequence of line groups. Each one is a tuple: |
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164 |
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165 'unchanged', lines |
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166 Lines unchanged from base |
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167 |
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168 'a', lines |
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169 Lines taken from a |
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170 |
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171 'same', lines |
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172 Lines taken from a (and equal to b) |
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173 |
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174 'b', lines |
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175 Lines taken from b |
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176 |
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177 'conflict', base_lines, a_lines, b_lines |
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178 Lines from base were changed to either a or b and conflict. |
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179 """ |
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180 for t in self.merge_regions(): |
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181 what = t[0] |
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182 if what == 'unchanged': |
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183 yield what, self.base[t[1]:t[2]] |
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184 elif what == 'a' or what == 'same': |
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185 yield what, self.a[t[1]:t[2]] |
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186 elif what == 'b': |
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187 yield what, self.b[t[1]:t[2]] |
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188 elif what == 'conflict': |
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189 yield (what, |
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190 self.base[t[1]:t[2]], |
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191 self.a[t[3]:t[4]], |
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192 self.b[t[5]:t[6]]) |
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193 else: |
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194 raise ValueError(what) |
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195 |
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196 def merge_regions(self): |
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197 """Return sequences of matching and conflicting regions. |
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198 |
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199 This returns tuples, where the first value says what kind we |
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200 have: |
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201 |
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202 'unchanged', start, end |
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203 Take a region of base[start:end] |
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204 |
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205 'same', astart, aend |
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206 b and a are different from base but give the same result |
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207 |
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208 'a', start, end |
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209 Non-clashing insertion from a[start:end] |
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210 |
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211 Method is as follows: |
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212 |
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213 The two sequences align only on regions which match the base |
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214 and both descendents. These are found by doing a two-way diff |
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215 of each one against the base, and then finding the |
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216 intersections between those regions. These "sync regions" |
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217 are by definition unchanged in both and easily dealt with. |
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218 |
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219 The regions in between can be in any of three cases: |
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220 conflicted, or changed on only one side. |
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221 """ |
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222 |
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223 # section a[0:ia] has been disposed of, etc |
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224 iz = ia = ib = 0 |
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225 |
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226 for zmatch, zend, amatch, aend, bmatch, bend in self.find_sync_regions(): |
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227 #print 'match base [%d:%d]' % (zmatch, zend) |
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228 |
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229 matchlen = zend - zmatch |
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230 assert matchlen >= 0 |
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231 assert matchlen == (aend - amatch) |
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232 assert matchlen == (bend - bmatch) |
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233 |
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234 len_a = amatch - ia |
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235 len_b = bmatch - ib |
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236 len_base = zmatch - iz |
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237 assert len_a >= 0 |
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238 assert len_b >= 0 |
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239 assert len_base >= 0 |
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240 |
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241 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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242 |
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243 if len_a or len_b: |
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244 # try to avoid actually slicing the lists |
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245 equal_a = compare_range(self.a, ia, amatch, |
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246 self.base, iz, zmatch) |
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247 equal_b = compare_range(self.b, ib, bmatch, |
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248 self.base, iz, zmatch) |
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249 same = compare_range(self.a, ia, amatch, |
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250 self.b, ib, bmatch) |
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251 |
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252 if same: |
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253 yield 'same', ia, amatch |
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254 elif equal_a and not equal_b: |
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255 yield 'b', ib, bmatch |
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256 elif equal_b and not equal_a: |
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257 yield 'a', ia, amatch |
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258 elif not equal_a and not equal_b: |
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259 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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260 else: |
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261 raise AssertionError("can't handle a=b=base but unmatched") |
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262 |
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263 ia = amatch |
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264 ib = bmatch |
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265 iz = zmatch |
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266 |
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267 # if the same part of the base was deleted on both sides |
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268 # that's OK, we can just skip it. |
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269 |
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270 |
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271 if matchlen > 0: |
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272 assert ia == amatch |
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273 assert ib == bmatch |
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274 assert iz == zmatch |
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275 |
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276 yield 'unchanged', zmatch, zend |
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277 iz = zend |
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278 ia = aend |
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279 ib = bend |
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280 |
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281 def reprocess_merge_regions(self, merge_regions): |
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282 """Where there are conflict regions, remove the agreed lines. |
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283 |
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284 Lines where both A and B have made the same changes are |
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285 eliminated. |
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286 """ |
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287 for region in merge_regions: |
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288 if region[0] != "conflict": |
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289 yield region |
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290 continue |
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291 type, iz, zmatch, ia, amatch, ib, bmatch = region |
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292 a_region = self.a[ia:amatch] |
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293 b_region = self.b[ib:bmatch] |
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294 matches = mdiff.get_matching_blocks(''.join(a_region), |
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295 ''.join(b_region)) |
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296 next_a = ia |
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297 next_b = ib |
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298 for region_ia, region_ib, region_len in matches[:-1]: |
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299 region_ia += ia |
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300 region_ib += ib |
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301 reg = self.mismatch_region(next_a, region_ia, next_b, |
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302 region_ib) |
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303 if reg is not None: |
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304 yield reg |
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305 yield 'same', region_ia, region_len + region_ia |
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306 next_a = region_ia + region_len |
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307 next_b = region_ib + region_len |
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308 reg = self.mismatch_region(next_a, amatch, next_b, bmatch) |
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309 if reg is not None: |
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310 yield reg |
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311 |
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312 def mismatch_region(next_a, region_ia, next_b, region_ib): |
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313 if next_a < region_ia or next_b < region_ib: |
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314 return 'conflict', None, None, next_a, region_ia, next_b, region_ib |
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315 mismatch_region = staticmethod(mismatch_region) |
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316 |
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317 def find_sync_regions(self): |
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318 """Return a list of sync regions, where both descendents match the base. |
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319 |
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320 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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321 always a zero-length sync region at the end of all the files. |
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322 """ |
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323 |
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324 ia = ib = 0 |
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325 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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326 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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327 len_a = len(amatches) |
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328 len_b = len(bmatches) |
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329 |
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330 sl = [] |
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331 |
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332 while ia < len_a and ib < len_b: |
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333 abase, amatch, alen = amatches[ia] |
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334 bbase, bmatch, blen = bmatches[ib] |
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335 |
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336 # there is an unconflicted block at i; how long does it |
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337 # extend? until whichever one ends earlier. |
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338 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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339 if i: |
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340 intbase = i[0] |
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341 intend = i[1] |
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342 intlen = intend - intbase |
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343 |
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344 # found a match of base[i[0], i[1]]; this may be less than |
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345 # the region that matches in either one |
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346 assert intlen <= alen |
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347 assert intlen <= blen |
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348 assert abase <= intbase |
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349 assert bbase <= intbase |
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350 |
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351 asub = amatch + (intbase - abase) |
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352 bsub = bmatch + (intbase - bbase) |
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353 aend = asub + intlen |
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354 bend = bsub + intlen |
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355 |
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356 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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357 (self.base[intbase:intend], self.a[asub:aend]) |
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358 |
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359 assert self.base[intbase:intend] == self.b[bsub:bend] |
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360 |
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361 sl.append((intbase, intend, |
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362 asub, aend, |
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363 bsub, bend)) |
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364 |
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365 # advance whichever one ends first in the base text |
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366 if (abase + alen) < (bbase + blen): |
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367 ia += 1 |
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368 else: |
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369 ib += 1 |
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370 |
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371 intbase = len(self.base) |
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372 abase = len(self.a) |
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373 bbase = len(self.b) |
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374 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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375 |
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376 return sl |
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377 |
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378 def find_unconflicted(self): |
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379 """Return a list of ranges in base that are not conflicted.""" |
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380 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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381 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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382 |
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383 unc = [] |
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384 |
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385 while am and bm: |
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386 # there is an unconflicted block at i; how long does it |
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387 # extend? until whichever one ends earlier. |
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388 a1 = am[0][0] |
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389 a2 = a1 + am[0][2] |
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390 b1 = bm[0][0] |
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391 b2 = b1 + bm[0][2] |
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392 i = intersect((a1, a2), (b1, b2)) |
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393 if i: |
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394 unc.append(i) |
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395 |
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396 if a2 < b2: |
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397 del am[0] |
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398 else: |
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399 del bm[0] |
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400 |
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401 return unc |
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402 |
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403 def simplemerge(ui, local, base, other, **opts): |
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404 def readfile(filename): |
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405 f = open(filename, "rb") |
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406 text = f.read() |
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407 f.close() |
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408 if util.binary(text): |
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409 msg = _("%s looks like a binary file.") % filename |
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410 if not opts.get('text'): |
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411 raise util.Abort(msg) |
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412 elif not opts.get('quiet'): |
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413 ui.warn(_('warning: %s\n') % msg) |
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414 return text |
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415 |
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416 name_a = local |
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417 name_b = other |
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418 labels = opts.get('label', []) |
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419 if labels: |
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420 name_a = labels.pop(0) |
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421 if labels: |
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422 name_b = labels.pop(0) |
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423 if labels: |
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424 raise util.Abort(_("can only specify two labels.")) |
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425 |
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426 localtext = readfile(local) |
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427 basetext = readfile(base) |
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428 othertext = readfile(other) |
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429 |
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430 local = os.path.realpath(local) |
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431 if not opts.get('print'): |
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432 opener = util.opener(os.path.dirname(local)) |
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433 out = opener(os.path.basename(local), "w", atomictemp=True) |
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434 else: |
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435 out = sys.stdout |
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436 |
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437 reprocess = not opts.get('no_minimal') |
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438 |
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439 m3 = Merge3Text(basetext, localtext, othertext) |
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440 for line in m3.merge_lines(name_a=name_a, name_b=name_b, |
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441 reprocess=reprocess): |
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442 out.write(line) |
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443 |
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444 if not opts.get('print'): |
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445 out.rename() |
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446 |
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447 if m3.conflicts: |
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448 if not opts.get('quiet'): |
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449 ui.warn(_("warning: conflicts during merge.\n")) |
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450 return 1 |