Mercurial > hg
annotate mercurial/simplemerge.py @ 37392:a4f02a17420d
copies: clean up _related logic
The limit parameter was never actually used, since the only way the 4th case
could be reached was if f1r and f2r converged. The new code makes this clear,
and additionally reduces the conditional block to just 3 cases.
author | Gábor Stefanik <gabor.stefanik@nng.com> |
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date | Thu, 05 Apr 2018 17:51:10 +0200 |
parents | f0b6fbea00cf |
children | e7aa113b14f7 |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 from .i18n import _ |
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22 from . import ( |
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23 error, |
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24 mdiff, |
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25 pycompat, |
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26 ) |
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27 from .utils import ( |
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28 stringutil, |
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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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Remove trailing spaces
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366 |
4362
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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 |
4362
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397 return unc |
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|
398 |
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399 def _verifytext(text, path, ui, opts): |
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400 """verifies that text is non-binary (unless opts[text] is passed, |
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401 then we just warn)""" |
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402 if stringutil.binary(text): |
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403 msg = _("%s looks like a binary file.") % path |
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404 if not opts.get('quiet'): |
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405 ui.warn(_('warning: %s\n') % msg) |
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406 if not opts.get('text'): |
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407 raise error.Abort(msg) |
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408 return text |
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409 |
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410 def _picklabels(defaults, overrides): |
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411 if len(overrides) > 3: |
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412 raise error.Abort(_("can only specify three labels.")) |
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413 result = defaults[:] |
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414 for i, override in enumerate(overrides): |
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415 result[i] = override |
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416 return result |
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417 |
34049
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418 def simplemerge(ui, localctx, basectx, otherctx, **opts): |
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419 """Performs the simplemerge algorithm. |
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420 |
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421 The merged result is written into `localctx`. |
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422 """ |
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423 opts = pycompat.byteskwargs(opts) |
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424 |
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425 def readctx(ctx): |
33902
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426 # Merges were always run in the working copy before, which means |
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427 # they used decoded data, if the user defined any repository |
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428 # filters. |
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429 # |
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430 # Maintain that behavior today for BC, though perhaps in the future |
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431 # it'd be worth considering whether merging encoded data (what the |
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432 # repository usually sees) might be more useful. |
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433 return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts) |
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434 |
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435 mode = opts.get('mode','merge') |
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|
436 name_a, name_b, name_base = None, None, None |
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437 if mode != 'union': |
33904
1915a5e809ca
simplemerge: use context paths for default labels instead of file paths
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438 name_a, name_b, name_base = _picklabels([localctx.path(), |
1915a5e809ca
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|
439 otherctx.path(), None], |
33830
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|
440 opts.get('label', [])) |
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|
441 |
14328
3c65cdcf3ba6
simplemerge: do not allow binary files to abort an entire merge
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parents:
12401
diff
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|
442 try: |
33905
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simplemerge: stop reading from, and writing to, files
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|
443 localtext = readctx(localctx) |
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444 basetext = readctx(basectx) |
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|
445 othertext = readctx(otherctx) |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
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|
446 except error.Abort: |
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447 return 1 |
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448 |
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449 m3 = Merge3Text(basetext, localtext, othertext) |
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diff
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|
450 extrakwargs = { |
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|
451 "localorother": opts.get("localorother", None), |
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|
452 'minimize': True, |
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|
453 } |
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454 if mode == 'union': |
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|
455 extrakwargs['start_marker'] = None |
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|
456 extrakwargs['mid_marker'] = None |
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|
457 extrakwargs['end_marker'] = None |
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changeset
|
458 elif name_base is not None: |
22024
372ae2745acf
simplemerge: support three labels when merging
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parents:
22023
diff
changeset
|
459 extrakwargs['base_marker'] = '|||||||' |
372ae2745acf
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22023
diff
changeset
|
460 extrakwargs['name_base'] = name_base |
28072
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diff
changeset
|
461 extrakwargs['minimize'] = False |
33908
4074de97b512
simplemerge: simplify code now that we always write to a context
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33907
diff
changeset
|
462 |
4074de97b512
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diff
changeset
|
463 mergedtext = "" |
33017
c31d45623304
py3: convert kwargs' keys' to str using pycompat.strkwargs()
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parents:
31238
diff
changeset
|
464 for line in m3.merge_lines(name_a=name_a, name_b=name_b, |
c31d45623304
py3: convert kwargs' keys' to str using pycompat.strkwargs()
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diff
changeset
|
465 **pycompat.strkwargs(extrakwargs)): |
33908
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simplemerge: simplify code now that we always write to a context
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33907
diff
changeset
|
466 if opts.get('print'): |
4074de97b512
simplemerge: simplify code now that we always write to a context
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diff
changeset
|
467 ui.fout.write(line) |
4074de97b512
simplemerge: simplify code now that we always write to a context
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33907
diff
changeset
|
468 else: |
4074de97b512
simplemerge: simplify code now that we always write to a context
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33907
diff
changeset
|
469 mergedtext += line |
4364
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diff
changeset
|
470 |
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polish the simplemerge command; add a test
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diff
changeset
|
471 if not opts.get('print'): |
33908
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diff
changeset
|
472 localctx.write(mergedtext, localctx.flags()) |
4364
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diff
changeset
|
473 |
26069
09d6725cbc60
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parents:
25974
diff
changeset
|
474 if m3.conflicts and not mode == 'union': |
4364
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polish the simplemerge command; add a test
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diff
changeset
|
475 return 1 |