Mercurial > hg
annotate mercurial/simplemerge.py @ 24283:ef22cfff7052
transaction: add a validation stage
The 'transaction' object can now be fed a 'validator' function. This function
will be run right before the transaction is closed to validate its content. The
target usage is hooks. The validation function is expected to raise an exception
when it wants to abort the transaction.
This only introduce the idea with a default no-op validator. Actual usage is in
the next changeset.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Mon, 09 Mar 2015 22:43:36 -0700 |
parents | 83df50a8d61c |
children | 241a1324a180 |
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 """Return merge in cvs-like form. |
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87 """ |
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88 self.conflicts = False |
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89 newline = '\n' |
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90 if len(self.a) > 0: |
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91 if self.a[0].endswith('\r\n'): |
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92 newline = '\r\n' |
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93 elif self.a[0].endswith('\r'): |
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94 newline = '\r' |
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95 if name_a: |
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96 start_marker = start_marker + ' ' + name_a |
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97 if name_b: |
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98 end_marker = end_marker + ' ' + name_b |
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99 if name_base and base_marker: |
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100 base_marker = base_marker + ' ' + name_base |
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101 merge_regions = self.merge_regions() |
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102 for t in merge_regions: |
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103 what = t[0] |
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104 if what == 'unchanged': |
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105 for i in range(t[1], t[2]): |
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106 yield self.base[i] |
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107 elif what == 'a' or what == 'same': |
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108 for i in range(t[1], t[2]): |
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109 yield self.a[i] |
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110 elif what == 'b': |
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111 for i in range(t[1], t[2]): |
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112 yield self.b[i] |
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113 elif what == 'conflict': |
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114 self.conflicts = True |
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115 yield start_marker + newline |
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116 for i in range(t[3], t[4]): |
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117 yield self.a[i] |
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118 if base_marker is not None: |
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119 yield base_marker + newline |
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120 for i in range(t[1], t[2]): |
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121 yield self.base[i] |
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122 yield mid_marker + newline |
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123 for i in range(t[5], t[6]): |
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124 yield self.b[i] |
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125 yield end_marker + newline |
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126 else: |
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127 raise ValueError(what) |
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128 |
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129 def merge_groups(self): |
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130 """Yield sequence of line groups. Each one is a tuple: |
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131 |
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132 'unchanged', lines |
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133 Lines unchanged from base |
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134 |
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135 'a', lines |
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136 Lines taken from a |
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137 |
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138 'same', lines |
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139 Lines taken from a (and equal to b) |
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140 |
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141 'b', lines |
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142 Lines taken from b |
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143 |
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144 'conflict', base_lines, a_lines, b_lines |
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145 Lines from base were changed to either a or b and conflict. |
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146 """ |
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147 for t in self.merge_regions(): |
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148 what = t[0] |
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149 if what == 'unchanged': |
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150 yield what, self.base[t[1]:t[2]] |
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151 elif what == 'a' or what == 'same': |
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152 yield what, self.a[t[1]:t[2]] |
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153 elif what == 'b': |
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154 yield what, self.b[t[1]:t[2]] |
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155 elif what == 'conflict': |
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156 yield (what, |
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157 self.base[t[1]:t[2]], |
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158 self.a[t[3]:t[4]], |
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159 self.b[t[5]:t[6]]) |
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160 else: |
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161 raise ValueError(what) |
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162 |
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163 def merge_regions(self): |
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164 """Return sequences of matching and conflicting regions. |
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165 |
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166 This returns tuples, where the first value says what kind we |
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167 have: |
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168 |
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169 'unchanged', start, end |
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170 Take a region of base[start:end] |
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171 |
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172 'same', astart, aend |
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173 b and a are different from base but give the same result |
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174 |
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175 'a', start, end |
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176 Non-clashing insertion from a[start:end] |
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177 |
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178 Method is as follows: |
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179 |
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180 The two sequences align only on regions which match the base |
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181 and both descendants. These are found by doing a two-way diff |
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182 of each one against the base, and then finding the |
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183 intersections between those regions. These "sync regions" |
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184 are by definition unchanged in both and easily dealt with. |
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185 |
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186 The regions in between can be in any of three cases: |
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187 conflicted, or changed on only one side. |
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188 """ |
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189 |
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190 # section a[0:ia] has been disposed of, etc |
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191 iz = ia = ib = 0 |
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192 |
16683 | 193 for region in self.find_sync_regions(): |
194 zmatch, zend, amatch, aend, bmatch, bend = region | |
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195 #print 'match base [%d:%d]' % (zmatch, zend) |
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196 |
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197 matchlen = zend - zmatch |
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198 assert matchlen >= 0 |
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199 assert matchlen == (aend - amatch) |
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200 assert matchlen == (bend - bmatch) |
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201 |
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202 len_a = amatch - ia |
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203 len_b = bmatch - ib |
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204 len_base = zmatch - iz |
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205 assert len_a >= 0 |
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206 assert len_b >= 0 |
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207 assert len_base >= 0 |
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208 |
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209 #print 'unmatched a=%d, b=%d' % (len_a, len_b) |
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210 |
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211 if len_a or len_b: |
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212 # try to avoid actually slicing the lists |
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213 equal_a = compare_range(self.a, ia, amatch, |
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214 self.base, iz, zmatch) |
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215 equal_b = compare_range(self.b, ib, bmatch, |
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216 self.base, iz, zmatch) |
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217 same = compare_range(self.a, ia, amatch, |
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218 self.b, ib, bmatch) |
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219 |
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220 if same: |
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221 yield 'same', ia, amatch |
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222 elif equal_a and not equal_b: |
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223 yield 'b', ib, bmatch |
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224 elif equal_b and not equal_a: |
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225 yield 'a', ia, amatch |
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226 elif not equal_a and not equal_b: |
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227 yield 'conflict', iz, zmatch, ia, amatch, ib, bmatch |
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228 else: |
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229 raise AssertionError("can't handle a=b=base but unmatched") |
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230 |
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231 ia = amatch |
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232 ib = bmatch |
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233 iz = zmatch |
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234 |
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235 # if the same part of the base was deleted on both sides |
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236 # that's OK, we can just skip it. |
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237 |
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238 |
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239 if matchlen > 0: |
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240 assert ia == amatch |
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241 assert ib == bmatch |
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242 assert iz == zmatch |
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243 |
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244 yield 'unchanged', zmatch, zend |
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245 iz = zend |
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246 ia = aend |
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247 ib = bend |
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248 |
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249 def find_sync_regions(self): |
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250 """Return a list of sync regions, where both descendants match the base. |
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251 |
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252 Generates a list of (base1, base2, a1, a2, b1, b2). There is |
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253 always a zero-length sync region at the end of all the files. |
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254 """ |
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255 |
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256 ia = ib = 0 |
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257 amatches = mdiff.get_matching_blocks(self.basetext, self.atext) |
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258 bmatches = mdiff.get_matching_blocks(self.basetext, self.btext) |
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259 len_a = len(amatches) |
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260 len_b = len(bmatches) |
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261 |
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262 sl = [] |
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263 |
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264 while ia < len_a and ib < len_b: |
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265 abase, amatch, alen = amatches[ia] |
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266 bbase, bmatch, blen = bmatches[ib] |
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267 |
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268 # there is an unconflicted block at i; how long does it |
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269 # extend? until whichever one ends earlier. |
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270 i = intersect((abase, abase + alen), (bbase, bbase + blen)) |
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271 if i: |
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272 intbase = i[0] |
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273 intend = i[1] |
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274 intlen = intend - intbase |
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275 |
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276 # found a match of base[i[0], i[1]]; this may be less than |
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277 # the region that matches in either one |
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278 assert intlen <= alen |
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279 assert intlen <= blen |
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280 assert abase <= intbase |
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281 assert bbase <= intbase |
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282 |
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283 asub = amatch + (intbase - abase) |
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284 bsub = bmatch + (intbase - bbase) |
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285 aend = asub + intlen |
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286 bend = bsub + intlen |
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287 |
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288 assert self.base[intbase:intend] == self.a[asub:aend], \ |
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289 (self.base[intbase:intend], self.a[asub:aend]) |
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290 |
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291 assert self.base[intbase:intend] == self.b[bsub:bend] |
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292 |
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293 sl.append((intbase, intend, |
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294 asub, aend, |
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295 bsub, bend)) |
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296 |
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297 # advance whichever one ends first in the base text |
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298 if (abase + alen) < (bbase + blen): |
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299 ia += 1 |
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300 else: |
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301 ib += 1 |
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302 |
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303 intbase = len(self.base) |
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304 abase = len(self.a) |
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305 bbase = len(self.b) |
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306 sl.append((intbase, intbase, abase, abase, bbase, bbase)) |
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307 |
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308 return sl |
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309 |
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310 def find_unconflicted(self): |
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311 """Return a list of ranges in base that are not conflicted.""" |
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312 am = mdiff.get_matching_blocks(self.basetext, self.atext) |
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313 bm = mdiff.get_matching_blocks(self.basetext, self.btext) |
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314 |
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315 unc = [] |
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316 |
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317 while am and bm: |
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318 # there is an unconflicted block at i; how long does it |
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319 # extend? until whichever one ends earlier. |
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320 a1 = am[0][0] |
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321 a2 = a1 + am[0][2] |
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322 b1 = bm[0][0] |
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323 b2 = b1 + bm[0][2] |
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324 i = intersect((a1, a2), (b1, b2)) |
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325 if i: |
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326 unc.append(i) |
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327 |
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328 if a2 < b2: |
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329 del am[0] |
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330 else: |
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331 del bm[0] |
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332 |
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333 return unc |
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334 |
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335 def simplemerge(ui, local, base, other, **opts): |
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336 def readfile(filename): |
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337 f = open(filename, "rb") |
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338 text = f.read() |
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339 f.close() |
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340 if util.binary(text): |
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341 msg = _("%s looks like a binary file.") % filename |
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342 if not opts.get('quiet'): |
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343 ui.warn(_('warning: %s\n') % msg) |
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344 if not opts.get('text'): |
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345 raise util.Abort(msg) |
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346 return text |
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347 |
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348 name_a = local |
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349 name_b = other |
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350 name_base = None |
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351 labels = opts.get('label', []) |
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352 if len(labels) > 0: |
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353 name_a = labels[0] |
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354 if len(labels) > 1: |
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355 name_b = labels[1] |
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356 if len(labels) > 2: |
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357 name_base = labels[2] |
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358 if len(labels) > 3: |
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359 raise util.Abort(_("can only specify three labels.")) |
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360 |
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361 try: |
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362 localtext = readfile(local) |
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363 basetext = readfile(base) |
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364 othertext = readfile(other) |
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365 except util.Abort: |
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366 return 1 |
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367 |
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368 local = os.path.realpath(local) |
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369 if not opts.get('print'): |
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370 opener = scmutil.opener(os.path.dirname(local)) |
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371 out = opener(os.path.basename(local), "w", atomictemp=True) |
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372 else: |
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373 out = sys.stdout |
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374 |
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375 m3 = Merge3Text(basetext, localtext, othertext) |
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376 extrakwargs = {} |
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377 if name_base is not None: |
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378 extrakwargs['base_marker'] = '|||||||' |
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379 extrakwargs['name_base'] = name_base |
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380 for line in m3.merge_lines(name_a=name_a, name_b=name_b, **extrakwargs): |
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381 out.write(line) |
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382 |
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383 if not opts.get('print'): |
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384 out.close() |
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385 |
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386 if m3.conflicts: |
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387 if not opts.get('quiet'): |
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388 ui.warn(_("warning: conflicts during merge.\n")) |
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389 return 1 |