Mercurial > hg
annotate mercurial/simplemerge.py @ 20835:0e8417131a29
util: add the code path to "cachefunc()" for the function taking no arguments
Before this patch, "util.cachefunc()" caches the value returned by the
specified function into dictionary "cache", even if the specified
function takes no arguments.
In such case, "cache" has at most one entry, and distinction between
entries in "cache" is meaningless.
This patch adds the code path to "cachefunc()" for the function taking
no arguments for efficiency: to store only one cached value, using
list "cache" is a little faster than using dictionary "cache".
author | FUJIWARA Katsunori <foozy@lares.dti.ne.jp> |
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date | Sat, 15 Feb 2014 19:52:26 +0900 |
parents | e34106fa0dc3 |
children | 4aeb7a6029ba |
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 i18n import _ |
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20 import scmutil, util, mdiff |
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21 import sys, os |
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22 |
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23 class CantReprocessAndShowBase(Exception): |
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24 pass |
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25 |
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26 def intersect(ra, rb): |
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27 """Given two ranges return the range where they intersect or None. |
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28 |
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29 >>> intersect((0, 10), (0, 6)) |
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30 (0, 6) |
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31 >>> intersect((0, 10), (5, 15)) |
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32 (5, 10) |
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33 >>> intersect((0, 10), (10, 15)) |
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34 >>> intersect((0, 9), (10, 15)) |
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35 >>> intersect((0, 9), (7, 15)) |
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36 (7, 9) |
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37 """ |
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38 assert ra[0] <= ra[1] |
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39 assert rb[0] <= rb[1] |
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40 |
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41 sa = max(ra[0], rb[0]) |
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42 sb = min(ra[1], rb[1]) |
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43 if sa < sb: |
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44 return sa, sb |
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45 else: |
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46 return None |
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47 |
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48 def compare_range(a, astart, aend, b, bstart, bend): |
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49 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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50 """ |
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51 if (aend - astart) != (bend - bstart): |
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52 return False |
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53 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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54 if a[ia] != b[ib]: |
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55 return False |
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56 else: |
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57 return True |
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58 |
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59 class Merge3Text(object): |
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60 """3-way merge of texts. |
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61 |
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62 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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63 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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64 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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65 self.basetext = basetext |
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66 self.atext = atext |
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67 self.btext = btext |
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68 if base is None: |
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69 base = mdiff.splitnewlines(basetext) |
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70 if a is None: |
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71 a = mdiff.splitnewlines(atext) |
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72 if b is None: |
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73 b = mdiff.splitnewlines(btext) |
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74 self.base = base |
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75 self.a = a |
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76 self.b = b |
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77 |
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78 def merge_lines(self, |
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79 name_a=None, |
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80 name_b=None, |
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81 name_base=None, |
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82 start_marker='<<<<<<<', |
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83 mid_marker='=======', |
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84 end_marker='>>>>>>>', |
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85 base_marker=None, |
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86 reprocess=False): |
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87 """Return merge in cvs-like form. |
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88 """ |
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89 self.conflicts = False |
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90 newline = '\n' |
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91 if len(self.a) > 0: |
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92 if self.a[0].endswith('\r\n'): |
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93 newline = '\r\n' |
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94 elif self.a[0].endswith('\r'): |
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95 newline = '\r' |
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96 if base_marker and reprocess: |
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97 raise CantReprocessAndShowBase |
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98 if name_a: |
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99 start_marker = start_marker + ' ' + name_a |
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100 if name_b: |
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101 end_marker = end_marker + ' ' + name_b |
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102 if name_base and base_marker: |
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103 base_marker = base_marker + ' ' + name_base |
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104 merge_regions = self.merge_regions() |
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105 if reprocess is True: |
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106 merge_regions = self.reprocess_merge_regions(merge_regions) |
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107 for t in merge_regions: |
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108 what = t[0] |
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109 if what == 'unchanged': |
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110 for i in range(t[1], t[2]): |
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111 yield self.base[i] |
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112 elif what == 'a' or what == 'same': |
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113 for i in range(t[1], t[2]): |
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114 yield self.a[i] |
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115 elif what == 'b': |
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116 for i in range(t[1], t[2]): |
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117 yield self.b[i] |
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118 elif what == 'conflict': |
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119 self.conflicts = True |
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120 yield start_marker + newline |
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121 for i in range(t[3], t[4]): |
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122 yield self.a[i] |
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123 if base_marker is not None: |
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124 yield base_marker + newline |
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125 for i in range(t[1], t[2]): |
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126 yield self.base[i] |
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127 yield mid_marker + newline |
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128 for i in range(t[5], t[6]): |
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129 yield self.b[i] |
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130 yield end_marker + newline |
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131 else: |
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132 raise ValueError(what) |
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133 |
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134 def merge_annotated(self): |
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135 """Return merge with conflicts, showing origin of lines. |
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136 |
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137 Most useful for debugging merge. |
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138 """ |
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139 for t in self.merge_regions(): |
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140 what = t[0] |
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141 if what == 'unchanged': |
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142 for i in range(t[1], t[2]): |
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143 yield 'u | ' + self.base[i] |
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144 elif what == 'a' or what == 'same': |
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145 for i in range(t[1], t[2]): |
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146 yield what[0] + ' | ' + self.a[i] |
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147 elif what == 'b': |
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148 for i in range(t[1], t[2]): |
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149 yield 'b | ' + self.b[i] |
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150 elif what == 'conflict': |
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151 yield '<<<<\n' |
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152 for i in range(t[3], t[4]): |
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153 yield 'A | ' + self.a[i] |
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154 yield '----\n' |
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155 for i in range(t[5], t[6]): |
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156 yield 'B | ' + self.b[i] |
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157 yield '>>>>\n' |
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158 else: |
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159 raise ValueError(what) |
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160 |
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161 def merge_groups(self): |
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162 """Yield sequence of line groups. Each one is a tuple: |
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163 |
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164 'unchanged', lines |
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165 Lines unchanged from base |
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166 |
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167 'a', lines |
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168 Lines taken from a |
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169 |
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170 'same', lines |
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171 Lines taken from a (and equal to b) |
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172 |
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173 'b', lines |
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174 Lines taken from b |
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175 |
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176 'conflict', base_lines, a_lines, b_lines |
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177 Lines from base were changed to either a or b and conflict. |
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178 """ |
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179 for t in self.merge_regions(): |
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180 what = t[0] |
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181 if what == 'unchanged': |
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182 yield what, self.base[t[1]:t[2]] |
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183 elif what == 'a' or what == 'same': |
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184 yield what, self.a[t[1]:t[2]] |
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185 elif what == 'b': |
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186 yield what, self.b[t[1]:t[2]] |
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187 elif what == 'conflict': |
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188 yield (what, |
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189 self.base[t[1]:t[2]], |
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190 self.a[t[3]:t[4]], |
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191 self.b[t[5]:t[6]]) |
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192 else: |
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193 raise ValueError(what) |
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194 |
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195 def merge_regions(self): |
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196 """Return sequences of matching and conflicting regions. |
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197 |
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198 This returns tuples, where the first value says what kind we |
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199 have: |
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200 |
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201 'unchanged', start, end |
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202 Take a region of base[start:end] |
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203 |
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204 'same', astart, aend |
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205 b and a are different from base but give the same result |
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206 |
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207 'a', start, end |
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208 Non-clashing insertion from a[start:end] |
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209 |
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210 Method is as follows: |
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211 |
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212 The two sequences align only on regions which match the base |
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213 and both descendants. These are found by doing a two-way diff |
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214 of each one against the base, and then finding the |
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215 intersections between those regions. These "sync regions" |
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216 are by definition unchanged in both and easily dealt with. |
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217 |
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218 The regions in between can be in any of three cases: |
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219 conflicted, or changed on only one side. |
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220 """ |
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221 |
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222 # section a[0:ia] has been disposed of, etc |
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223 iz = ia = ib = 0 |
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224 |
16683 | 225 for region in self.find_sync_regions(): |
226 zmatch, zend, amatch, aend, bmatch, bend = region | |
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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 descendants 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('quiet'): |
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411 ui.warn(_('warning: %s\n') % msg) |
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412 if not opts.get('text'): |
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413 raise util.Abort(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 try: |
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427 localtext = readfile(local) |
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428 basetext = readfile(base) |
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429 othertext = readfile(other) |
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430 except util.Abort: |
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431 return 1 |
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432 |
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433 local = os.path.realpath(local) |
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434 if not opts.get('print'): |
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435 opener = scmutil.opener(os.path.dirname(local)) |
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436 out = opener(os.path.basename(local), "w", atomictemp=True) |
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437 else: |
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438 out = sys.stdout |
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439 |
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440 reprocess = not opts.get('no_minimal') |
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441 |
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442 m3 = Merge3Text(basetext, localtext, othertext) |
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443 for line in m3.merge_lines(name_a=name_a, name_b=name_b, |
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444 reprocess=reprocess): |
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445 out.write(line) |
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446 |
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447 if not opts.get('print'): |
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448 out.close() |
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449 |
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450 if m3.conflicts: |
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451 if not opts.get('quiet'): |
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452 ui.warn(_("warning: conflicts during merge.\n")) |
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453 return 1 |