Mercurial > hg
annotate mercurial/mdiff.py @ 46779:49fd21f32695
revlog: guarantee that p1 != null if a non-null parent exists
This change does not affect the hashing (which already did this
transformation), but can change the log output in the rare case where
this behavior was observed in repositories. The change can simplify
iteration code where regular changesets and merges are distinct
branches.
Differential Revision: https://phab.mercurial-scm.org/D10150
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Wed, 10 Mar 2021 18:09:21 +0100 |
parents | 89a2afe31e82 |
children | d4ba4d51f85f |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2859 | 3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import re |
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11 import struct |
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12 import zlib |
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13 |
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14 from .i18n import _ |
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15 from .pycompat import ( |
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16 getattr, |
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17 setattr, |
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18 ) |
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19 from . import ( |
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20 diffhelper, |
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21 encoding, |
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22 error, |
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23 policy, |
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24 pycompat, |
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25 util, |
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26 ) |
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27 from .utils import dateutil |
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28 |
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29 bdiff = policy.importmod('bdiff') |
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30 mpatch = policy.importmod('mpatch') |
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31 |
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32 blocks = bdiff.blocks |
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33 fixws = bdiff.fixws |
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34 patches = mpatch.patches |
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35 patchedsize = mpatch.patchedsize |
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36 textdiff = bdiff.bdiff |
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37 splitnewlines = bdiff.splitnewlines |
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38 |
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39 |
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40 # TODO: this looks like it could be an attrs, which might help pytype |
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41 class diffopts(object): |
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42 """context is the number of context lines |
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43 text treats all files as text |
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44 showfunc enables diff -p output |
2907 | 45 git enables the git extended patch format |
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46 nodates removes dates from diff headers |
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47 nobinary ignores binary files |
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48 noprefix disables the 'a/' and 'b/' prefixes (ignored in plain mode) |
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49 ignorews ignores all whitespace changes in the diff |
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50 ignorewsamount ignores changes in the amount of whitespace |
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51 ignoreblanklines ignores changes whose lines are all blank |
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52 upgrade generates git diffs to avoid data loss |
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53 """ |
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54 |
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55 _HAS_DYNAMIC_ATTRIBUTES = True |
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56 |
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57 defaults = { |
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58 b'context': 3, |
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59 b'text': False, |
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60 b'showfunc': False, |
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61 b'git': False, |
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62 b'nodates': False, |
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63 b'nobinary': False, |
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64 b'noprefix': False, |
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65 b'index': 0, |
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66 b'ignorews': False, |
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67 b'ignorewsamount': False, |
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68 b'ignorewseol': False, |
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69 b'ignoreblanklines': False, |
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70 b'upgrade': False, |
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71 b'showsimilarity': False, |
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72 b'worddiff': False, |
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73 b'xdiff': False, |
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74 } |
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75 |
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76 def __init__(self, **opts): |
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77 opts = pycompat.byteskwargs(opts) |
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78 for k in self.defaults.keys(): |
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79 v = opts.get(k) |
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80 if v is None: |
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81 v = self.defaults[k] |
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82 setattr(self, k, v) |
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83 |
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84 try: |
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85 self.context = int(self.context) |
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86 except ValueError: |
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87 raise error.Abort( |
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88 _(b'diff context lines count must be an integer, not %r') |
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89 % pycompat.bytestr(self.context) |
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90 ) |
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91 |
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92 def copy(self, **kwargs): |
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93 opts = {k: getattr(self, k) for k in self.defaults} |
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94 opts = pycompat.strkwargs(opts) |
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95 opts.update(kwargs) |
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96 return diffopts(**opts) |
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97 |
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98 |
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99 defaultopts = diffopts() |
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100 |
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101 |
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102 def wsclean(opts, text, blank=True): |
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103 if opts.ignorews: |
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104 text = bdiff.fixws(text, 1) |
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105 elif opts.ignorewsamount: |
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106 text = bdiff.fixws(text, 0) |
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107 if blank and opts.ignoreblanklines: |
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108 text = re.sub(b'\n+', b'\n', text).strip(b'\n') |
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109 if opts.ignorewseol: |
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110 text = re.sub(br'[ \t\r\f]+\n', br'\n', text) |
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111 return text |
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112 |
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113 |
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114 def splitblock(base1, lines1, base2, lines2, opts): |
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115 # The input lines matches except for interwoven blank lines. We |
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116 # transform it into a sequence of matching blocks and blank blocks. |
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117 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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118 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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119 s1, e1 = 0, len(lines1) |
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120 s2, e2 = 0, len(lines2) |
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121 while s1 < e1 or s2 < e2: |
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122 i1, i2, btype = s1, s2, b'=' |
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123 if i1 >= e1 or lines1[i1] == 0 or i2 >= e2 or lines2[i2] == 0: |
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124 # Consume the block of blank lines |
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125 btype = b'~' |
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126 while i1 < e1 and lines1[i1] == 0: |
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127 i1 += 1 |
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128 while i2 < e2 and lines2[i2] == 0: |
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129 i2 += 1 |
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130 else: |
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131 # Consume the matching lines |
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132 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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133 i1 += 1 |
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134 i2 += 1 |
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135 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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136 s1 = i1 |
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137 s2 = i2 |
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138 |
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139 |
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140 def hunkinrange(hunk, linerange): |
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141 """Return True if `hunk` defined as (start, length) is in `linerange` |
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142 defined as (lowerbound, upperbound). |
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143 |
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144 >>> hunkinrange((5, 10), (2, 7)) |
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145 True |
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146 >>> hunkinrange((5, 10), (6, 12)) |
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147 True |
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148 >>> hunkinrange((5, 10), (13, 17)) |
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149 True |
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150 >>> hunkinrange((5, 10), (3, 17)) |
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151 True |
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152 >>> hunkinrange((5, 10), (1, 3)) |
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153 False |
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154 >>> hunkinrange((5, 10), (18, 20)) |
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155 False |
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156 >>> hunkinrange((5, 10), (1, 5)) |
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157 False |
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158 >>> hunkinrange((5, 10), (15, 27)) |
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159 False |
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160 """ |
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161 start, length = hunk |
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162 lowerbound, upperbound = linerange |
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163 return lowerbound < start + length and start < upperbound |
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164 |
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165 |
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166 def blocksinrange(blocks, rangeb): |
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167 """filter `blocks` like (a1, a2, b1, b2) from items outside line range |
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168 `rangeb` from ``(b1, b2)`` point of view. |
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169 |
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170 Return `filteredblocks, rangea` where: |
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171 |
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172 * `filteredblocks` is list of ``block = (a1, a2, b1, b2), stype`` items of |
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173 `blocks` that are inside `rangeb` from ``(b1, b2)`` point of view; a |
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174 block ``(b1, b2)`` being inside `rangeb` if |
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175 ``rangeb[0] < b2 and b1 < rangeb[1]``; |
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176 * `rangea` is the line range w.r.t. to ``(a1, a2)`` parts of `blocks`. |
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177 """ |
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178 lbb, ubb = rangeb |
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179 lba, uba = None, None |
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180 filteredblocks = [] |
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181 for block in blocks: |
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182 (a1, a2, b1, b2), stype = block |
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183 if lbb >= b1 and ubb <= b2 and stype == b'=': |
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184 # rangeb is within a single "=" hunk, restrict back linerange1 |
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185 # by offsetting rangeb |
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186 lba = lbb - b1 + a1 |
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187 uba = ubb - b1 + a1 |
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188 else: |
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189 if b1 <= lbb < b2: |
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190 if stype == b'=': |
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191 lba = a2 - (b2 - lbb) |
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192 else: |
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193 lba = a1 |
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194 if b1 < ubb <= b2: |
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195 if stype == b'=': |
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196 uba = a1 + (ubb - b1) |
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197 else: |
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198 uba = a2 |
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199 if hunkinrange((b1, (b2 - b1)), rangeb): |
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200 filteredblocks.append(block) |
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201 if lba is None or uba is None or uba < lba: |
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202 raise error.InputError(_(b'line range exceeds file size')) |
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203 return filteredblocks, (lba, uba) |
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204 |
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205 |
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206 def chooseblocksfunc(opts=None): |
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207 if ( |
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208 opts is None |
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209 or not opts.xdiff |
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210 or not util.safehasattr(bdiff, b'xdiffblocks') |
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211 ): |
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212 return bdiff.blocks |
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213 else: |
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214 return bdiff.xdiffblocks |
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215 |
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216 |
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217 def allblocks(text1, text2, opts=None, lines1=None, lines2=None): |
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218 """Return (block, type) tuples, where block is an mdiff.blocks |
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219 line entry. type is '=' for blocks matching exactly one another |
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220 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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221 matching only after having filtered blank lines. |
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222 line1 and line2 are text1 and text2 split with splitnewlines() if |
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223 they are already available. |
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224 """ |
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225 if opts is None: |
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226 opts = defaultopts |
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227 if opts.ignorews or opts.ignorewsamount or opts.ignorewseol: |
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228 text1 = wsclean(opts, text1, False) |
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229 text2 = wsclean(opts, text2, False) |
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230 diff = chooseblocksfunc(opts)(text1, text2) |
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231 for i, s1 in enumerate(diff): |
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232 # The first match is special. |
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233 # we've either found a match starting at line 0 or a match later |
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234 # in the file. If it starts later, old and new below will both be |
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235 # empty and we'll continue to the next match. |
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236 if i > 0: |
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237 s = diff[i - 1] |
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238 else: |
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239 s = [0, 0, 0, 0] |
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240 s = [s[1], s1[0], s[3], s1[2]] |
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241 |
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242 # bdiff sometimes gives huge matches past eof, this check eats them, |
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243 # and deals with the special first match case described above |
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244 if s[0] != s[1] or s[2] != s[3]: |
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245 type = b'!' |
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246 if opts.ignoreblanklines: |
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247 if lines1 is None: |
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248 lines1 = splitnewlines(text1) |
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249 if lines2 is None: |
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250 lines2 = splitnewlines(text2) |
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251 old = wsclean(opts, b"".join(lines1[s[0] : s[1]])) |
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252 new = wsclean(opts, b"".join(lines2[s[2] : s[3]])) |
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253 if old == new: |
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254 type = b'~' |
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255 yield s, type |
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256 yield s1, b'=' |
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257 |
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258 |
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259 def unidiff(a, ad, b, bd, fn1, fn2, binary, opts=defaultopts): |
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260 """Return a unified diff as a (headers, hunks) tuple. |
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261 |
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262 If the diff is not null, `headers` is a list with unified diff header |
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263 lines "--- <original>" and "+++ <new>" and `hunks` is a generator yielding |
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264 (hunkrange, hunklines) coming from _unidiff(). |
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265 Otherwise, `headers` and `hunks` are empty. |
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266 |
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267 Set binary=True if either a or b should be taken as a binary file. |
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268 """ |
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269 |
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270 def datetag(date, fn=None): |
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271 if not opts.git and not opts.nodates: |
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272 return b'\t%s' % date |
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273 if fn and b' ' in fn: |
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274 return b'\t' |
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275 return b'' |
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276 |
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277 sentinel = [], () |
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278 if not a and not b: |
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279 return sentinel |
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280 |
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281 if opts.noprefix: |
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282 aprefix = bprefix = b'' |
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283 else: |
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284 aprefix = b'a/' |
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285 bprefix = b'b/' |
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286 |
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287 epoch = dateutil.datestr((0, 0)) |
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288 |
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289 fn1 = util.pconvert(fn1) |
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290 fn2 = util.pconvert(fn2) |
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291 |
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292 if binary: |
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293 if a and b and len(a) == len(b) and a == b: |
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294 return sentinel |
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295 headerlines = [] |
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296 hunks = ((None, [b'Binary file %s has changed\n' % fn1]),) |
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297 elif not a: |
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298 without_newline = not b.endswith(b'\n') |
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299 b = splitnewlines(b) |
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300 if a is None: |
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301 l1 = b'--- /dev/null%s' % datetag(epoch) |
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302 else: |
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303 l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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304 l2 = b"+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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305 headerlines = [l1, l2] |
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306 size = len(b) |
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307 hunkrange = (0, 0, 1, size) |
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308 hunklines = [b"@@ -0,0 +1,%d @@\n" % size] + [b"+" + e for e in b] |
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309 if without_newline: |
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310 hunklines[-1] += b'\n' |
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311 hunklines.append(diffhelper.MISSING_NEWLINE_MARKER) |
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312 hunks = ((hunkrange, hunklines),) |
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313 elif not b: |
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314 without_newline = not a.endswith(b'\n') |
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315 a = splitnewlines(a) |
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316 l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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317 if b is None: |
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318 l2 = b'+++ /dev/null%s' % datetag(epoch) |
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319 else: |
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320 l2 = b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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321 headerlines = [l1, l2] |
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322 size = len(a) |
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323 hunkrange = (1, size, 0, 0) |
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324 hunklines = [b"@@ -1,%d +0,0 @@\n" % size] + [b"-" + e for e in a] |
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325 if without_newline: |
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326 hunklines[-1] += b'\n' |
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327 hunklines.append(diffhelper.MISSING_NEWLINE_MARKER) |
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328 hunks = ((hunkrange, hunklines),) |
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329 else: |
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330 hunks = _unidiff(a, b, opts=opts) |
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331 if not next(hunks): |
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332 return sentinel |
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333 |
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334 headerlines = [ |
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335 b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)), |
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336 b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)), |
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337 ] |
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338 |
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339 return headerlines, hunks |
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340 |
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341 |
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342 def _unidiff(t1, t2, opts=defaultopts): |
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343 """Yield hunks of a headerless unified diff from t1 and t2 texts. |
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344 |
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345 Each hunk consists of a (hunkrange, hunklines) tuple where `hunkrange` is a |
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346 tuple (s1, l1, s2, l2) representing the range information of the hunk to |
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347 form the '@@ -s1,l1 +s2,l2 @@' header and `hunklines` is a list of lines |
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348 of the hunk combining said header followed by line additions and |
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349 deletions. |
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350 |
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351 The hunks are prefixed with a bool. |
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352 """ |
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353 l1 = splitnewlines(t1) |
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354 l2 = splitnewlines(t2) |
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355 |
1637 | 356 def contextend(l, len): |
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357 ret = l + opts.context |
1637 | 358 if ret > len: |
359 ret = len | |
360 return ret | |
361 | |
362 def contextstart(l): | |
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363 ret = l - opts.context |
1637 | 364 if ret < 0: |
365 return 0 | |
366 return ret | |
367 | |
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368 lastfunc = [0, b''] |
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369 |
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370 def yieldhunk(hunk): |
1637 | 371 (astart, a2, bstart, b2, delta) = hunk |
372 aend = contextend(a2, len(l1)) | |
373 alen = aend - astart | |
374 blen = b2 - bstart + aend - a2 | |
375 | |
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376 func = b"" |
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377 if opts.showfunc: |
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378 lastpos, func = lastfunc |
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379 # walk backwards from the start of the context up to the start of |
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380 # the previous hunk context until we find a line starting with an |
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381 # alphanumeric char. |
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382 for i in pycompat.xrange(astart - 1, lastpos - 1, -1): |
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383 if l1[i][0:1].isalnum(): |
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384 func = b' ' + l1[i].rstrip() |
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385 # split long function name if ASCII. otherwise we have no |
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386 # idea where the multi-byte boundary is, so just leave it. |
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387 if encoding.isasciistr(func): |
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388 func = func[:41] |
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389 lastfunc[1] = func |
1637 | 390 break |
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391 # by recording this hunk's starting point as the next place to |
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392 # start looking for function lines, we avoid reading any line in |
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393 # the file more than once. |
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394 lastfunc[0] = astart |
1637 | 395 |
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396 # zero-length hunk ranges report their start line as one less |
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397 if alen: |
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398 astart += 1 |
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399 if blen: |
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400 bstart += 1 |
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401 |
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402 hunkrange = astart, alen, bstart, blen |
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403 hunklines = ( |
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404 [b"@@ -%d,%d +%d,%d @@%s\n" % (hunkrange + (func,))] |
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405 + delta |
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406 + [b' ' + l1[x] for x in pycompat.xrange(a2, aend)] |
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407 ) |
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408 # If either file ends without a newline and the last line of |
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409 # that file is part of a hunk, a marker is printed. If the |
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410 # last line of both files is identical and neither ends in |
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411 # a newline, print only one marker. That's the only case in |
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412 # which the hunk can end in a shared line without a newline. |
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413 skip = False |
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414 if not t1.endswith(b'\n') and astart + alen == len(l1) + 1: |
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415 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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416 if hunklines[i].startswith((b'-', b' ')): |
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417 if hunklines[i].startswith(b' '): |
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418 skip = True |
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419 hunklines[i] += b'\n' |
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420 hunklines.insert(i + 1, diffhelper.MISSING_NEWLINE_MARKER) |
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421 break |
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422 if not skip and not t2.endswith(b'\n') and bstart + blen == len(l2) + 1: |
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423 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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424 if hunklines[i].startswith(b'+'): |
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425 hunklines[i] += b'\n' |
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426 hunklines.insert(i + 1, diffhelper.MISSING_NEWLINE_MARKER) |
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427 break |
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428 yield hunkrange, hunklines |
1637 | 429 |
430 # bdiff.blocks gives us the matching sequences in the files. The loop | |
431 # below finds the spaces between those matching sequences and translates | |
432 # them into diff output. | |
433 # | |
434 hunk = None | |
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435 ignoredlines = 0 |
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436 has_hunks = False |
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437 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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438 a1, a2, b1, b2 = s |
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439 if stype != b'!': |
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440 if stype == b'~': |
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441 # The diff context lines are based on t1 content. When |
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442 # blank lines are ignored, the new lines offsets must |
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443 # be adjusted as if equivalent blocks ('~') had the |
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444 # same sizes on both sides. |
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445 ignoredlines += (b2 - b1) - (a2 - a1) |
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446 continue |
1637 | 447 delta = [] |
448 old = l1[a1:a2] | |
449 new = l2[b1:b2] | |
450 | |
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451 b1 -= ignoredlines |
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mdiff: adjust hunk offsets with --ignore-blank-lines (issue3234)
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452 b2 -= ignoredlines |
1637 | 453 astart = contextstart(a1) |
454 bstart = contextstart(b1) | |
455 prev = None | |
456 if hunk: | |
457 # join with the previous hunk if it falls inside the context | |
2874
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refactor text diff/patch code.
Vadim Gelfer <vadim.gelfer@gmail.com>
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458 if astart < hunk[1] + opts.context + 1: |
1637 | 459 prev = hunk |
460 astart = hunk[1] | |
461 bstart = hunk[3] | |
462 else: | |
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463 if not has_hunks: |
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464 has_hunks = True |
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465 yield True |
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466 for x in yieldhunk(hunk): |
1637 | 467 yield x |
468 if prev: | |
469 # we've joined the previous hunk, record the new ending points. | |
470 hunk[1] = a2 | |
471 hunk[3] = b2 | |
472 delta = hunk[4] | |
473 else: | |
474 # create a new hunk | |
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many, many trivial check-code fixups
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475 hunk = [astart, a2, bstart, b2, delta] |
1637 | 476 |
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477 delta[len(delta) :] = [b' ' + x for x in l1[astart:a1]] |
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478 delta[len(delta) :] = [b'-' + x for x in old] |
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479 delta[len(delta) :] = [b'+' + x for x in new] |
1637 | 480 |
481 if hunk: | |
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482 if not has_hunks: |
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483 has_hunks = True |
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parents:
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484 yield True |
10614
d0050f36e688
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parents:
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485 for x in yieldhunk(hunk): |
1637 | 486 yield x |
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487 elif not has_hunks: |
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488 yield False |
1637 | 489 |
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Augie Fackler <augie@google.com>
parents:
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490 |
17939
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diff: move b85diff to mdiff module
Guillermo Pérez <bisho at fb.com>
parents:
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491 def b85diff(to, tn): |
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diff: move b85diff to mdiff module
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492 '''print base85-encoded binary diff''' |
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493 |
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494 def fmtline(line): |
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495 l = len(line) |
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496 if l <= 26: |
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497 l = pycompat.bytechr(ord(b'A') + l - 1) |
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498 else: |
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499 l = pycompat.bytechr(l - 26 + ord(b'a') - 1) |
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500 return b'%c%s\n' % (l, util.b85encode(line, True)) |
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501 |
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502 def chunk(text, csize=52): |
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503 l = len(text) |
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504 i = 0 |
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505 while i < l: |
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506 yield text[i : i + csize] |
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507 i += csize |
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508 |
17946
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diff: move index header generation to patch
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509 if to is None: |
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510 to = b'' |
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511 if tn is None: |
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512 tn = b'' |
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513 |
1e13b1184292
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514 if to == tn: |
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515 return b'' |
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516 |
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517 # TODO: deltas |
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518 ret = [] |
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519 ret.append(b'GIT binary patch\n') |
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520 ret.append(b'literal %d\n' % len(tn)) |
17939
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521 for l in chunk(zlib.compress(tn)): |
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522 ret.append(fmtline(l)) |
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523 ret.append(b'\n') |
17946
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524 |
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525 return b''.join(ret) |
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526 |
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527 |
120
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
75
diff
changeset
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528 def patchtext(bin): |
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
75
diff
changeset
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529 pos = 0 |
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
75
diff
changeset
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530 t = [] |
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
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diff
changeset
|
531 while pos < len(bin): |
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532 p1, p2, l = struct.unpack(b">lll", bin[pos : pos + 12]) |
120
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
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diff
changeset
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533 pos += 12 |
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534 t.append(bin[pos : pos + l]) |
120
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Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
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diff
changeset
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535 pos += l |
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536 return b"".join(t) |
120
bae6f0328f63
Add a function to return the new text from a binary diff
mpm@selenic.com
parents:
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diff
changeset
|
537 |
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538 |
0
9117c6561b0b
Add back links from file revisions to changeset revisions
mpm@selenic.com
parents:
diff
changeset
|
539 def patch(a, bin): |
12025
2315a95ee887
mdiff.patch(): add a special case for when the base text is empty
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
10614
diff
changeset
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540 if len(a) == 0: |
2315a95ee887
mdiff.patch(): add a special case for when the base text is empty
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
10614
diff
changeset
|
541 # skip over trivial delta header |
15657
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util: don't mess with builtins to emulate buffer()
Matt Mackall <mpm@selenic.com>
parents:
15530
diff
changeset
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542 return util.buffer(bin, 12) |
1379 | 543 return mpatch.patches(a, [bin]) |
432 | 544 |
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545 |
4361
99c853a1408c
add mdiff.get_matching_blocks
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
4108
diff
changeset
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546 # similar to difflib.SequenceMatcher.get_matching_blocks |
99c853a1408c
add mdiff.get_matching_blocks
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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diff
changeset
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547 def get_matching_blocks(a, b): |
99c853a1408c
add mdiff.get_matching_blocks
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
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diff
changeset
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548 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
99c853a1408c
add mdiff.get_matching_blocks
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parents:
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diff
changeset
|
549 |
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changeset
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550 |
5367
7530334bf301
revlog: generate trivial deltas against null revision
Matt Mackall <mpm@selenic.com>
parents:
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diff
changeset
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551 def trivialdiffheader(length): |
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552 return struct.pack(b">lll", 0, 0, length) if length else b'' |
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553 |
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554 |
24119
a5a06c9c7407
mdiff: add helper for making deltas which replace the full text of a revision
Mike Edgar <adgar@google.com>
parents:
23299
diff
changeset
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555 def replacediffheader(oldlen, newlen): |
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556 return struct.pack(b">lll", 0, oldlen, newlen) |