Mercurial > hg
annotate mercurial/simplemerge.py @ 33766:4c706037adef
wireproto: overhaul iterating batcher code (API)
The remote batching code is difficult to read. Let's improve it.
As part of the refactor, the future returned by method calls on
batchiter() instances is now populated. However, you still need to
consume the results() generator for the future to be set. But at
least now we can stuff the future somewhere and not have to worry
about aligning method call order with result order since you can
use a future to hold the result.
Also as part of the change, we now verify that @batchable generators
yield exactly 2 values. In other words, we enforce their API.
The non-iter batcher has been unused since b6e71f8af5b8. And to my
surprise we had no explicit unit test coverage of it! test-batching.py
has been overhauled to use the iterating batcher.
Since the iterating batcher doesn't allow non-batchable method
calls nor local calls, tests have been updated to reflect reality.
The iterating batcher has been used for multiple releases apparently
without major issue. So this shouldn't cause alarm.
.. api::
@peer.batchable functions must now yield exactly 2 values
Differential Revision: https://phab.mercurial-scm.org/D319
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 09 Aug 2017 23:29:30 -0700 |
parents | c31d45623304 |
children | de573184686e |
rev | line source |
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1 # Copyright (C) 2004, 2005 Canonical Ltd |
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2 # |
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3 # This program is free software; you can redistribute it and/or modify |
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4 # it under the terms of the GNU General Public License as published by |
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5 # the Free Software Foundation; either version 2 of the License, or |
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6 # (at your option) any later version. |
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7 # |
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8 # This program is distributed in the hope that it will be useful, |
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9 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 # GNU General Public License for more details. |
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12 # |
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13 # You should have received a copy of the GNU General Public License |
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14 # along with this program; if not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 # mbp: "you know that thing where cvs gives you conflict markers?" |
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17 # s: "i hate that." |
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18 |
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19 from __future__ import absolute_import |
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20 |
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21 import os |
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22 |
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23 from .i18n import _ |
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24 from . import ( |
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25 error, |
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26 mdiff, |
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27 pycompat, |
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28 util, |
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29 vfs as vfsmod, |
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30 ) |
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31 |
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32 class CantReprocessAndShowBase(Exception): |
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33 pass |
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34 |
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35 def intersect(ra, rb): |
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36 """Given two ranges return the range where they intersect or None. |
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37 |
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38 >>> intersect((0, 10), (0, 6)) |
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39 (0, 6) |
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40 >>> intersect((0, 10), (5, 15)) |
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41 (5, 10) |
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42 >>> intersect((0, 10), (10, 15)) |
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43 >>> intersect((0, 9), (10, 15)) |
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44 >>> intersect((0, 9), (7, 15)) |
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45 (7, 9) |
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46 """ |
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47 assert ra[0] <= ra[1] |
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48 assert rb[0] <= rb[1] |
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49 |
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50 sa = max(ra[0], rb[0]) |
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51 sb = min(ra[1], rb[1]) |
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52 if sa < sb: |
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53 return sa, sb |
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54 else: |
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55 return None |
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56 |
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57 def compare_range(a, astart, aend, b, bstart, bend): |
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58 """Compare a[astart:aend] == b[bstart:bend], without slicing. |
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59 """ |
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60 if (aend - astart) != (bend - bstart): |
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61 return False |
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62 for ia, ib in zip(xrange(astart, aend), xrange(bstart, bend)): |
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63 if a[ia] != b[ib]: |
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64 return False |
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65 else: |
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66 return True |
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67 |
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68 class Merge3Text(object): |
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69 """3-way merge of texts. |
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70 |
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71 Given strings BASE, OTHER, THIS, tries to produce a combined text |
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72 incorporating the changes from both BASE->OTHER and BASE->THIS.""" |
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73 def __init__(self, basetext, atext, btext, base=None, a=None, b=None): |
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74 self.basetext = basetext |
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75 self.atext = atext |
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76 self.btext = btext |
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77 if base is None: |
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78 base = mdiff.splitnewlines(basetext) |
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79 if a is None: |
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80 a = mdiff.splitnewlines(atext) |
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81 if b is None: |
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82 b = mdiff.splitnewlines(btext) |
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83 self.base = base |
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84 self.a = a |
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85 self.b = b |
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86 |
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87 def merge_lines(self, |
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88 name_a=None, |
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89 name_b=None, |
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90 name_base=None, |
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91 start_marker='<<<<<<<', |
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92 mid_marker='=======', |
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93 end_marker='>>>>>>>', |
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94 base_marker=None, |
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95 localorother=None, |
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96 minimize=False): |
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97 """Return merge in cvs-like form. |
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98 """ |
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99 self.conflicts = False |
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100 newline = '\n' |
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101 if len(self.a) > 0: |
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102 if self.a[0].endswith('\r\n'): |
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103 newline = '\r\n' |
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104 elif self.a[0].endswith('\r'): |
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105 newline = '\r' |
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106 if name_a and start_marker: |
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107 start_marker = start_marker + ' ' + name_a |
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108 if name_b and end_marker: |
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109 end_marker = end_marker + ' ' + name_b |
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110 if name_base and base_marker: |
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111 base_marker = base_marker + ' ' + name_base |
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112 merge_regions = self.merge_regions() |
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113 if minimize: |
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114 merge_regions = self.minimize(merge_regions) |
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115 for t in merge_regions: |
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116 what = t[0] |
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117 if what == 'unchanged': |
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118 for i in range(t[1], t[2]): |
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119 yield self.base[i] |
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120 elif what == 'a' or what == 'same': |
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121 for i in range(t[1], t[2]): |
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122 yield self.a[i] |
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123 elif what == 'b': |
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124 for i in range(t[1], t[2]): |
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125 yield self.b[i] |
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126 elif what == 'conflict': |
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127 if localorother == 'local': |
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128 for i in range(t[3], t[4]): |
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129 yield self.a[i] |
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130 elif localorother == 'other': |
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131 for i in range(t[5], t[6]): |
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132 yield self.b[i] |
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133 else: |
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134 self.conflicts = True |
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135 if start_marker is not None: |
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136 yield start_marker + newline |
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137 for i in range(t[3], t[4]): |
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138 yield self.a[i] |
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139 if base_marker is not None: |
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140 yield base_marker + newline |
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141 for i in range(t[1], t[2]): |
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142 yield self.base[i] |
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143 if mid_marker is not None: |
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144 yield mid_marker + newline |
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145 for i in range(t[5], t[6]): |
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146 yield self.b[i] |
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147 if end_marker is not None: |
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148 yield end_marker + newline |
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149 else: |
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150 raise ValueError(what) |
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151 |
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152 def merge_groups(self): |
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153 """Yield sequence of line groups. Each one is a tuple: |
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154 |
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155 'unchanged', lines |
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156 Lines unchanged from base |
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157 |
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158 'a', lines |
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159 Lines taken from a |
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160 |
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161 'same', lines |
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162 Lines taken from a (and equal to b) |
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163 |
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164 'b', lines |
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165 Lines taken from b |
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166 |
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167 'conflict', base_lines, a_lines, b_lines |
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168 Lines from base were changed to either a or b and conflict. |
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169 """ |
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170 for t in self.merge_regions(): |
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171 what = t[0] |
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172 if what == 'unchanged': |
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173 yield what, self.base[t[1]:t[2]] |
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174 elif what == 'a' or what == 'same': |
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175 yield what, self.a[t[1]:t[2]] |
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176 elif what == 'b': |
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177 yield what, self.b[t[1]:t[2]] |
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178 elif what == 'conflict': |
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179 yield (what, |
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180 self.base[t[1]:t[2]], |
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181 self.a[t[3]:t[4]], |
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182 self.b[t[5]:t[6]]) |
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183 else: |
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184 raise ValueError(what) |
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185 |
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186 def merge_regions(self): |
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187 """Return sequences of matching and conflicting regions. |
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188 |
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189 This returns tuples, where the first value says what kind we |
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190 have: |
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191 |
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192 'unchanged', start, end |
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193 Take a region of base[start:end] |
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194 |
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195 'same', astart, aend |
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196 b and a are different from base but give the same result |
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197 |
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198 'a', start, end |
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199 Non-clashing insertion from a[start:end] |
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200 |
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201 'conflict', zstart, zend, astart, aend, bstart, bend |
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202 Conflict between a and b, with z as common ancestor |
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203 |
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204 Method is as follows: |
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205 |
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206 The two sequences align only on regions which match the base |
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207 and both descendants. These are found by doing a two-way diff |
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208 of each one against the base, and then finding the |
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209 intersections between those regions. These "sync regions" |
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210 are by definition unchanged in both and easily dealt with. |
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211 |
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212 The regions in between can be in any of three cases: |
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213 conflicted, or changed on only one side. |
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214 """ |
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215 |
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216 # section a[0:ia] has been disposed of, etc |
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217 iz = ia = ib = 0 |
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218 |
16683 | 219 for region in self.find_sync_regions(): |
220 zmatch, zend, amatch, aend, bmatch, bend = region | |
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221 #print 'match base [%d:%d]' % (zmatch, zend) |
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222 |
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223 matchlen = zend - zmatch |
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224 assert matchlen >= 0 |
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225 assert matchlen == (aend - amatch) |
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226 assert matchlen == (bend - bmatch) |
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227 |
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228 len_a = amatch - ia |
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229 len_b = bmatch - ib |
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230 len_base = zmatch - iz |
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231 assert len_a >= 0 |
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232 assert len_b >= 0 |
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233 assert len_base >= 0 |
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234 |
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235 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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236 |
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237 if len_a or len_b: |
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238 # try to avoid actually slicing the lists |
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239 equal_a = compare_range(self.a, ia, amatch, |
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240 self.base, iz, zmatch) |
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241 equal_b = compare_range(self.b, ib, bmatch, |
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242 self.base, iz, zmatch) |
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243 same = compare_range(self.a, ia, amatch, |
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244 self.b, ib, bmatch) |
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245 |
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246 if same: |
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247 yield 'same', ia, amatch |
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248 elif equal_a and not equal_b: |
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249 yield 'b', ib, bmatch |
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250 elif equal_b and not equal_a: |
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251 yield 'a', ia, amatch |
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252 elif not equal_a and not equal_b: |
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253 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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254 else: |
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255 raise AssertionError("can't handle a=b=base but unmatched") |
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256 |
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257 ia = amatch |
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258 ib = bmatch |
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259 iz = zmatch |
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260 |
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261 # if the same part of the base was deleted on both sides |
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262 # that's OK, we can just skip it. |
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263 |
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264 |
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265 if matchlen > 0: |
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266 assert ia == amatch |
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267 assert ib == bmatch |
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268 assert iz == zmatch |
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269 |
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270 yield 'unchanged', zmatch, zend |
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271 iz = zend |
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272 ia = aend |
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273 ib = bend |
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274 |
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275 def minimize(self, merge_regions): |
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276 """Trim conflict regions of lines where A and B sides match. |
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277 |
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278 Lines where both A and B have made the same changes at the beginning |
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279 or the end of each merge region are eliminated from the conflict |
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280 region and are instead considered the same. |
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281 """ |
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282 for region in merge_regions: |
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283 if region[0] != "conflict": |
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284 yield region |
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285 continue |
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286 issue, z1, z2, a1, a2, b1, b2 = region |
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287 alen = a2 - a1 |
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288 blen = b2 - b1 |
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289 |
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290 # find matches at the front |
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291 ii = 0 |
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292 while ii < alen and ii < blen and \ |
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293 self.a[a1 + ii] == self.b[b1 + ii]: |
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294 ii += 1 |
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295 startmatches = ii |
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296 |
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297 # find matches at the end |
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298 ii = 0 |
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299 while ii < alen and ii < blen and \ |
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300 self.a[a2 - ii - 1] == self.b[b2 - ii - 1]: |
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301 ii += 1 |
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302 endmatches = ii |
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303 |
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304 if startmatches > 0: |
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305 yield 'same', a1, a1 + startmatches |
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306 |
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307 yield ('conflict', z1, z2, |
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308 a1 + startmatches, a2 - endmatches, |
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309 b1 + startmatches, b2 - endmatches) |
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310 |
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311 if endmatches > 0: |
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312 yield 'same', a2 - endmatches, a2 |
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313 |
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314 def find_sync_regions(self): |
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315 """Return a list of sync regions, where both descendants match the base. |
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316 |
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317 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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318 always a zero-length sync region at the end of all the files. |
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319 """ |
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320 |
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321 ia = ib = 0 |
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322 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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323 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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324 len_a = len(amatches) |
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325 len_b = len(bmatches) |
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326 |
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327 sl = [] |
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328 |
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329 while ia < len_a and ib < len_b: |
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330 abase, amatch, alen = amatches[ia] |
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331 bbase, bmatch, blen = bmatches[ib] |
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332 |
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333 # there is an unconflicted block at i; how long does it |
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334 # extend? until whichever one ends earlier. |
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335 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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336 if i: |
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337 intbase = i[0] |
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338 intend = i[1] |
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339 intlen = intend - intbase |
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340 |
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341 # found a match of base[i[0], i[1]]; this may be less than |
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342 # the region that matches in either one |
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343 assert intlen <= alen |
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344 assert intlen <= blen |
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345 assert abase <= intbase |
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346 assert bbase <= intbase |
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347 |
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348 asub = amatch + (intbase - abase) |
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349 bsub = bmatch + (intbase - bbase) |
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350 aend = asub + intlen |
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351 bend = bsub + intlen |
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352 |
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353 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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354 (self.base[intbase:intend], self.a[asub:aend]) |
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355 |
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356 assert self.base[intbase:intend] == self.b[bsub:bend] |
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357 |
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358 sl.append((intbase, intend, |
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359 asub, aend, |
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360 bsub, bend)) |
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361 |
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362 # advance whichever one ends first in the base text |
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363 if (abase + alen) < (bbase + blen): |
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364 ia += 1 |
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365 else: |
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366 ib += 1 |
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367 |
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368 intbase = len(self.base) |
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369 abase = len(self.a) |
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370 bbase = len(self.b) |
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371 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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372 |
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373 return sl |
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374 |
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375 def find_unconflicted(self): |
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376 """Return a list of ranges in base that are not conflicted.""" |
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377 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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378 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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379 |
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380 unc = [] |
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381 |
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382 while am and bm: |
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383 # there is an unconflicted block at i; how long does it |
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384 # extend? until whichever one ends earlier. |
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385 a1 = am[0][0] |
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386 a2 = a1 + am[0][2] |
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387 b1 = bm[0][0] |
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388 b2 = b1 + bm[0][2] |
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389 i = intersect((a1, a2), (b1, b2)) |
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390 if i: |
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391 unc.append(i) |
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392 |
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393 if a2 < b2: |
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394 del am[0] |
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395 else: |
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396 del bm[0] |
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397 |
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398 return unc |
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399 |
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400 def simplemerge(ui, local, base, other, **opts): |
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401 def readfile(filename): |
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402 f = open(filename, "rb") |
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403 text = f.read() |
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404 f.close() |
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405 if util.binary(text): |
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406 msg = _("%s looks like a binary file.") % filename |
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407 if not opts.get('quiet'): |
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408 ui.warn(_('warning: %s\n') % msg) |
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409 if not opts.get('text'): |
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410 raise error.Abort(msg) |
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411 return text |
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412 |
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413 mode = opts.get('mode','merge') |
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414 if mode == 'union': |
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415 name_a = None |
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416 name_b = None |
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417 name_base = None |
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418 else: |
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419 name_a = local |
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420 name_b = other |
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421 name_base = None |
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422 labels = opts.get('label', []) |
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423 if len(labels) > 0: |
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424 name_a = labels[0] |
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425 if len(labels) > 1: |
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426 name_b = labels[1] |
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427 if len(labels) > 2: |
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428 name_base = labels[2] |
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429 if len(labels) > 3: |
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430 raise error.Abort(_("can only specify three labels.")) |
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431 |
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432 try: |
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433 localtext = readfile(local) |
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434 basetext = readfile(base) |
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435 othertext = readfile(other) |
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436 except error.Abort: |
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437 return 1 |
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438 |
15381
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backout dbdb777502dc (issue3077) (issue3071)
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439 local = os.path.realpath(local) |
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440 if not opts.get('print'): |
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vfs: use 'vfs' module directly in 'mercurial.simplemerge'
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441 opener = vfsmod.vfs(os.path.dirname(local)) |
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442 out = opener(os.path.basename(local), "w", atomictemp=True) |
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443 else: |
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444 out = ui.fout |
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445 |
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446 m3 = Merge3Text(basetext, localtext, othertext) |
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|
447 extrakwargs = { |
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448 "localorother": opts.get("localorother", None), |
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449 'minimize': True, |
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450 } |
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451 if mode == 'union': |
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452 extrakwargs['start_marker'] = None |
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453 extrakwargs['mid_marker'] = None |
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454 extrakwargs['end_marker'] = None |
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455 elif name_base is not None: |
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diff
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|
456 extrakwargs['base_marker'] = '|||||||' |
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457 extrakwargs['name_base'] = name_base |
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458 extrakwargs['minimize'] = False |
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py3: convert kwargs' keys' to str using pycompat.strkwargs()
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parents:
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|
459 for line in m3.merge_lines(name_a=name_a, name_b=name_b, |
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|
460 **pycompat.strkwargs(extrakwargs)): |
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461 out.write(line) |
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462 |
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463 if not opts.get('print'): |
15057
774da7121fc9
atomictempfile: make close() consistent with other file-like objects.
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diff
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464 out.close() |
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465 |
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466 if m3.conflicts and not mode == 'union': |
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467 return 1 |