Mercurial > hg
annotate mercurial/mdiff.py @ 43588:a825ba8eb0a1 stable
relnotes: copy "next" to "5.2" and clear "next"
This is the same thing as we did for 5.1 in cba59b338976 (relnotes:
copy "next" to "5.1" and clear "next", 2019-08-01).
Differential Revision: https://phab.mercurial-scm.org/D7231
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Tue, 05 Nov 2019 13:31:40 -0800 |
parents | 8ff1ecfadcd1 |
children | f2f460cdb4f5 |
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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 encoding, |
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21 error, |
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22 policy, |
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23 pycompat, |
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24 util, |
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25 ) |
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26 from .utils import dateutil |
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27 |
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28 _missing_newline_marker = b"\\ No newline at end of file\n" |
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29 |
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30 bdiff = policy.importmod(r'bdiff') |
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31 mpatch = policy.importmod(r'mpatch') |
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32 |
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33 blocks = bdiff.blocks |
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34 fixws = bdiff.fixws |
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35 patches = mpatch.patches |
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36 patchedsize = mpatch.patchedsize |
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37 textdiff = bdiff.bdiff |
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38 splitnewlines = bdiff.splitnewlines |
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39 |
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40 |
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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 defaults = { |
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56 b'context': 3, |
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57 b'text': False, |
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58 b'showfunc': False, |
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59 b'git': False, |
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60 b'nodates': False, |
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61 b'nobinary': False, |
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62 b'noprefix': False, |
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63 b'index': 0, |
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64 b'ignorews': False, |
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65 b'ignorewsamount': False, |
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66 b'ignorewseol': False, |
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67 b'ignoreblanklines': False, |
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68 b'upgrade': False, |
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69 b'showsimilarity': False, |
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70 b'worddiff': False, |
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71 b'xdiff': False, |
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72 } |
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73 |
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74 def __init__(self, **opts): |
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75 opts = pycompat.byteskwargs(opts) |
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76 for k in self.defaults.keys(): |
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77 v = opts.get(k) |
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78 if v is None: |
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79 v = self.defaults[k] |
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80 setattr(self, k, v) |
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81 |
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82 try: |
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83 self.context = int(self.context) |
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84 except ValueError: |
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85 raise error.Abort( |
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86 _(b'diff context lines count must be an integer, not %r') |
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87 % pycompat.bytestr(self.context) |
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88 ) |
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89 |
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90 def copy(self, **kwargs): |
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91 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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92 opts = pycompat.strkwargs(opts) |
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93 opts.update(kwargs) |
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94 return diffopts(**opts) |
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95 |
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96 |
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97 defaultopts = diffopts() |
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98 |
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99 |
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100 def wsclean(opts, text, blank=True): |
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101 if opts.ignorews: |
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102 text = bdiff.fixws(text, 1) |
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103 elif opts.ignorewsamount: |
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104 text = bdiff.fixws(text, 0) |
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105 if blank and opts.ignoreblanklines: |
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106 text = re.sub(b'\n+', b'\n', text).strip(b'\n') |
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107 if opts.ignorewseol: |
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108 text = re.sub(br'[ \t\r\f]+\n', br'\n', text) |
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109 return text |
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110 |
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111 |
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112 def splitblock(base1, lines1, base2, lines2, opts): |
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113 # The input lines matches except for interwoven blank lines. We |
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114 # transform it into a sequence of matching blocks and blank blocks. |
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115 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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116 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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117 s1, e1 = 0, len(lines1) |
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118 s2, e2 = 0, len(lines2) |
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119 while s1 < e1 or s2 < e2: |
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120 i1, i2, btype = s1, s2, b'=' |
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121 if i1 >= e1 or lines1[i1] == 0 or i2 >= e2 or lines2[i2] == 0: |
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122 # Consume the block of blank lines |
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123 btype = b'~' |
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124 while i1 < e1 and lines1[i1] == 0: |
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125 i1 += 1 |
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126 while i2 < e2 and lines2[i2] == 0: |
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127 i2 += 1 |
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128 else: |
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129 # Consume the matching lines |
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130 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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131 i1 += 1 |
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132 i2 += 1 |
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133 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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134 s1 = i1 |
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135 s2 = i2 |
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136 |
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137 |
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138 def hunkinrange(hunk, linerange): |
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139 """Return True if `hunk` defined as (start, length) is in `linerange` |
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140 defined as (lowerbound, upperbound). |
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141 |
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142 >>> hunkinrange((5, 10), (2, 7)) |
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143 True |
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144 >>> hunkinrange((5, 10), (6, 12)) |
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145 True |
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146 >>> hunkinrange((5, 10), (13, 17)) |
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147 True |
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148 >>> hunkinrange((5, 10), (3, 17)) |
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149 True |
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150 >>> hunkinrange((5, 10), (1, 3)) |
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151 False |
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152 >>> hunkinrange((5, 10), (18, 20)) |
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153 False |
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154 >>> hunkinrange((5, 10), (1, 5)) |
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155 False |
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156 >>> hunkinrange((5, 10), (15, 27)) |
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157 False |
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158 """ |
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159 start, length = hunk |
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160 lowerbound, upperbound = linerange |
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161 return lowerbound < start + length and start < upperbound |
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162 |
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163 |
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164 def blocksinrange(blocks, rangeb): |
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165 """filter `blocks` like (a1, a2, b1, b2) from items outside line range |
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166 `rangeb` from ``(b1, b2)`` point of view. |
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167 |
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168 Return `filteredblocks, rangea` where: |
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169 |
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170 * `filteredblocks` is list of ``block = (a1, a2, b1, b2), stype`` items of |
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171 `blocks` that are inside `rangeb` from ``(b1, b2)`` point of view; a |
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172 block ``(b1, b2)`` being inside `rangeb` if |
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173 ``rangeb[0] < b2 and b1 < rangeb[1]``; |
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174 * `rangea` is the line range w.r.t. to ``(a1, a2)`` parts of `blocks`. |
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175 """ |
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176 lbb, ubb = rangeb |
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177 lba, uba = None, None |
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178 filteredblocks = [] |
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179 for block in blocks: |
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180 (a1, a2, b1, b2), stype = block |
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181 if lbb >= b1 and ubb <= b2 and stype == b'=': |
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182 # rangeb is within a single "=" hunk, restrict back linerange1 |
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183 # by offsetting rangeb |
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184 lba = lbb - b1 + a1 |
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185 uba = ubb - b1 + a1 |
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186 else: |
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187 if b1 <= lbb < b2: |
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188 if stype == b'=': |
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189 lba = a2 - (b2 - lbb) |
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190 else: |
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191 lba = a1 |
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192 if b1 < ubb <= b2: |
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193 if stype == b'=': |
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194 uba = a1 + (ubb - b1) |
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195 else: |
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196 uba = a2 |
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197 if hunkinrange((b1, (b2 - b1)), rangeb): |
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198 filteredblocks.append(block) |
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199 if lba is None or uba is None or uba < lba: |
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200 raise error.Abort(_(b'line range exceeds file size')) |
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201 return filteredblocks, (lba, uba) |
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202 |
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203 |
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204 def chooseblocksfunc(opts=None): |
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205 if ( |
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206 opts is None |
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207 or not opts.xdiff |
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208 or not util.safehasattr(bdiff, b'xdiffblocks') |
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209 ): |
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210 return bdiff.blocks |
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211 else: |
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212 return bdiff.xdiffblocks |
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213 |
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214 |
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215 def allblocks(text1, text2, opts=None, lines1=None, lines2=None): |
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216 """Return (block, type) tuples, where block is an mdiff.blocks |
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217 line entry. type is '=' for blocks matching exactly one another |
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218 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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219 matching only after having filtered blank lines. |
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220 line1 and line2 are text1 and text2 split with splitnewlines() if |
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221 they are already available. |
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222 """ |
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223 if opts is None: |
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224 opts = defaultopts |
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225 if opts.ignorews or opts.ignorewsamount or opts.ignorewseol: |
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226 text1 = wsclean(opts, text1, False) |
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227 text2 = wsclean(opts, text2, False) |
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228 diff = chooseblocksfunc(opts)(text1, text2) |
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229 for i, s1 in enumerate(diff): |
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230 # The first match is special. |
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231 # we've either found a match starting at line 0 or a match later |
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232 # in the file. If it starts later, old and new below will both be |
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233 # empty and we'll continue to the next match. |
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234 if i > 0: |
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235 s = diff[i - 1] |
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236 else: |
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237 s = [0, 0, 0, 0] |
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238 s = [s[1], s1[0], s[3], s1[2]] |
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239 |
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240 # bdiff sometimes gives huge matches past eof, this check eats them, |
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241 # and deals with the special first match case described above |
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242 if s[0] != s[1] or s[2] != s[3]: |
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243 type = b'!' |
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244 if opts.ignoreblanklines: |
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245 if lines1 is None: |
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246 lines1 = splitnewlines(text1) |
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247 if lines2 is None: |
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248 lines2 = splitnewlines(text2) |
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249 old = wsclean(opts, b"".join(lines1[s[0] : s[1]])) |
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250 new = wsclean(opts, b"".join(lines2[s[2] : s[3]])) |
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251 if old == new: |
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252 type = b'~' |
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253 yield s, type |
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254 yield s1, b'=' |
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255 |
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256 |
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257 def unidiff(a, ad, b, bd, fn1, fn2, binary, opts=defaultopts): |
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258 """Return a unified diff as a (headers, hunks) tuple. |
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259 |
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260 If the diff is not null, `headers` is a list with unified diff header |
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261 lines "--- <original>" and "+++ <new>" and `hunks` is a generator yielding |
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262 (hunkrange, hunklines) coming from _unidiff(). |
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263 Otherwise, `headers` and `hunks` are empty. |
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264 |
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265 Set binary=True if either a or b should be taken as a binary file. |
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266 """ |
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267 |
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268 def datetag(date, fn=None): |
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269 if not opts.git and not opts.nodates: |
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270 return b'\t%s' % date |
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271 if fn and b' ' in fn: |
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272 return b'\t' |
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273 return b'' |
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274 |
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275 sentinel = [], () |
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276 if not a and not b: |
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277 return sentinel |
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278 |
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279 if opts.noprefix: |
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280 aprefix = bprefix = b'' |
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281 else: |
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282 aprefix = b'a/' |
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283 bprefix = b'b/' |
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284 |
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285 epoch = dateutil.datestr((0, 0)) |
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286 |
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287 fn1 = util.pconvert(fn1) |
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288 fn2 = util.pconvert(fn2) |
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289 |
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290 if binary: |
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291 if a and b and len(a) == len(b) and a == b: |
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292 return sentinel |
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293 headerlines = [] |
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294 hunks = ((None, [b'Binary file %s has changed\n' % fn1]),) |
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295 elif not a: |
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296 without_newline = not b.endswith(b'\n') |
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297 b = splitnewlines(b) |
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298 if a is None: |
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299 l1 = b'--- /dev/null%s' % datetag(epoch) |
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300 else: |
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301 l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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302 l2 = b"+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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303 headerlines = [l1, l2] |
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304 size = len(b) |
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305 hunkrange = (0, 0, 1, size) |
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306 hunklines = [b"@@ -0,0 +1,%d @@\n" % size] + [b"+" + e for e in b] |
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307 if without_newline: |
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308 hunklines[-1] += b'\n' |
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309 hunklines.append(_missing_newline_marker) |
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310 hunks = ((hunkrange, hunklines),) |
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311 elif not b: |
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312 without_newline = not a.endswith(b'\n') |
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313 a = splitnewlines(a) |
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314 l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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315 if b is None: |
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316 l2 = b'+++ /dev/null%s' % datetag(epoch) |
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317 else: |
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318 l2 = b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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319 headerlines = [l1, l2] |
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320 size = len(a) |
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321 hunkrange = (1, size, 0, 0) |
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322 hunklines = [b"@@ -1,%d +0,0 @@\n" % size] + [b"-" + e for e in a] |
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323 if without_newline: |
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324 hunklines[-1] += b'\n' |
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325 hunklines.append(_missing_newline_marker) |
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326 hunks = ((hunkrange, hunklines),) |
264
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327 else: |
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328 hunks = _unidiff(a, b, opts=opts) |
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329 if not next(hunks): |
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330 return sentinel |
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331 |
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332 headerlines = [ |
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333 b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)), |
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334 b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)), |
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335 ] |
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336 |
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337 return headerlines, hunks |
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338 |
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339 |
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340 def _unidiff(t1, t2, opts=defaultopts): |
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341 """Yield hunks of a headerless unified diff from t1 and t2 texts. |
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342 |
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343 Each hunk consists of a (hunkrange, hunklines) tuple where `hunkrange` is a |
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344 tuple (s1, l1, s2, l2) representing the range information of the hunk to |
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345 form the '@@ -s1,l1 +s2,l2 @@' header and `hunklines` is a list of lines |
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346 of the hunk combining said header followed by line additions and |
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347 deletions. |
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348 |
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349 The hunks are prefixed with a bool. |
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350 """ |
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351 l1 = splitnewlines(t1) |
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352 l2 = splitnewlines(t2) |
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353 |
1637 | 354 def contextend(l, len): |
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355 ret = l + opts.context |
1637 | 356 if ret > len: |
357 ret = len | |
358 return ret | |
359 | |
360 def contextstart(l): | |
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361 ret = l - opts.context |
1637 | 362 if ret < 0: |
363 return 0 | |
364 return ret | |
365 | |
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366 lastfunc = [0, b''] |
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367 |
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368 def yieldhunk(hunk): |
1637 | 369 (astart, a2, bstart, b2, delta) = hunk |
370 aend = contextend(a2, len(l1)) | |
371 alen = aend - astart | |
372 blen = b2 - bstart + aend - a2 | |
373 | |
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374 func = b"" |
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375 if opts.showfunc: |
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376 lastpos, func = lastfunc |
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377 # walk backwards from the start of the context up to the start of |
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378 # the previous hunk context until we find a line starting with an |
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379 # alphanumeric char. |
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380 for i in pycompat.xrange(astart - 1, lastpos - 1, -1): |
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381 if l1[i][0:1].isalnum(): |
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382 func = b' ' + l1[i].rstrip() |
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383 # split long function name if ASCII. otherwise we have no |
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384 # idea where the multi-byte boundary is, so just leave it. |
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385 if encoding.isasciistr(func): |
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386 func = func[:41] |
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387 lastfunc[1] = func |
1637 | 388 break |
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389 # by recording this hunk's starting point as the next place to |
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390 # start looking for function lines, we avoid reading any line in |
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391 # the file more than once. |
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392 lastfunc[0] = astart |
1637 | 393 |
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394 # zero-length hunk ranges report their start line as one less |
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395 if alen: |
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396 astart += 1 |
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397 if blen: |
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398 bstart += 1 |
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399 |
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400 hunkrange = astart, alen, bstart, blen |
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401 hunklines = ( |
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402 [b"@@ -%d,%d +%d,%d @@%s\n" % (hunkrange + (func,))] |
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403 + delta |
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404 + [b' ' + l1[x] for x in pycompat.xrange(a2, aend)] |
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405 ) |
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406 # If either file ends without a newline and the last line of |
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407 # that file is part of a hunk, a marker is printed. If the |
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408 # last line of both files is identical and neither ends in |
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409 # a newline, print only one marker. That's the only case in |
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410 # which the hunk can end in a shared line without a newline. |
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411 skip = False |
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412 if not t1.endswith(b'\n') and astart + alen == len(l1) + 1: |
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413 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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414 if hunklines[i].startswith((b'-', b' ')): |
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415 if hunklines[i].startswith(b' '): |
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416 skip = True |
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417 hunklines[i] += b'\n' |
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418 hunklines.insert(i + 1, _missing_newline_marker) |
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419 break |
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420 if not skip and not t2.endswith(b'\n') and bstart + blen == len(l2) + 1: |
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421 for i in pycompat.xrange(len(hunklines) - 1, -1, -1): |
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422 if hunklines[i].startswith(b'+'): |
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423 hunklines[i] += b'\n' |
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424 hunklines.insert(i + 1, _missing_newline_marker) |
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425 break |
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426 yield hunkrange, hunklines |
1637 | 427 |
428 # bdiff.blocks gives us the matching sequences in the files. The loop | |
429 # below finds the spaces between those matching sequences and translates | |
430 # them into diff output. | |
431 # | |
432 hunk = None | |
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433 ignoredlines = 0 |
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434 has_hunks = False |
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435 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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436 a1, a2, b1, b2 = s |
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437 if stype != b'!': |
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438 if stype == b'~': |
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439 # The diff context lines are based on t1 content. When |
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440 # blank lines are ignored, the new lines offsets must |
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441 # be adjusted as if equivalent blocks ('~') had the |
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442 # same sizes on both sides. |
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443 ignoredlines += (b2 - b1) - (a2 - a1) |
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444 continue |
1637 | 445 delta = [] |
446 old = l1[a1:a2] | |
447 new = l2[b1:b2] | |
448 | |
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449 b1 -= ignoredlines |
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450 b2 -= ignoredlines |
1637 | 451 astart = contextstart(a1) |
452 bstart = contextstart(b1) | |
453 prev = None | |
454 if hunk: | |
455 # join with the previous hunk if it falls inside the context | |
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456 if astart < hunk[1] + opts.context + 1: |
1637 | 457 prev = hunk |
458 astart = hunk[1] | |
459 bstart = hunk[3] | |
460 else: | |
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461 if not has_hunks: |
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462 has_hunks = True |
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463 yield True |
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464 for x in yieldhunk(hunk): |
1637 | 465 yield x |
466 if prev: | |
467 # we've joined the previous hunk, record the new ending points. | |
468 hunk[1] = a2 | |
469 hunk[3] = b2 | |
470 delta = hunk[4] | |
471 else: | |
472 # create a new hunk | |
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473 hunk = [astart, a2, bstart, b2, delta] |
1637 | 474 |
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475 delta[len(delta) :] = [b' ' + x for x in l1[astart:a1]] |
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476 delta[len(delta) :] = [b'-' + x for x in old] |
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477 delta[len(delta) :] = [b'+' + x for x in new] |
1637 | 478 |
479 if hunk: | |
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480 if not has_hunks: |
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481 has_hunks = True |
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482 yield True |
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483 for x in yieldhunk(hunk): |
1637 | 484 yield x |
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485 elif not has_hunks: |
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486 yield False |
1637 | 487 |
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488 |
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489 def b85diff(to, tn): |
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490 '''print base85-encoded binary diff''' |
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491 |
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492 def fmtline(line): |
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493 l = len(line) |
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494 if l <= 26: |
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495 l = pycompat.bytechr(ord(b'A') + l - 1) |
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496 else: |
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497 l = pycompat.bytechr(l - 26 + ord(b'a') - 1) |
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498 return b'%c%s\n' % (l, util.b85encode(line, True)) |
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499 |
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500 def chunk(text, csize=52): |
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501 l = len(text) |
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502 i = 0 |
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503 while i < l: |
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504 yield text[i : i + csize] |
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505 i += csize |
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506 |
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507 if to is None: |
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508 to = b'' |
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509 if tn is None: |
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510 tn = b'' |
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511 |
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512 if to == tn: |
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513 return b'' |
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514 |
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515 # TODO: deltas |
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516 ret = [] |
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517 ret.append(b'GIT binary patch\n') |
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518 ret.append(b'literal %d\n' % len(tn)) |
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519 for l in chunk(zlib.compress(tn)): |
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520 ret.append(fmtline(l)) |
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521 ret.append(b'\n') |
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522 |
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523 return b''.join(ret) |
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524 |
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525 |
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526 def patchtext(bin): |
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527 pos = 0 |
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528 t = [] |
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529 while pos < len(bin): |
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530 p1, p2, l = struct.unpack(b">lll", bin[pos : pos + 12]) |
120
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531 pos += 12 |
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532 t.append(bin[pos : pos + l]) |
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533 pos += l |
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534 return b"".join(t) |
120
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535 |
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536 |
0
9117c6561b0b
Add back links from file revisions to changeset revisions
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diff
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|
537 def patch(a, bin): |
12025
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538 if len(a) == 0: |
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539 # skip over trivial delta header |
15657
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diff
changeset
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540 return util.buffer(bin, 12) |
1379 | 541 return mpatch.patches(a, [bin]) |
432 | 542 |
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543 |
4361
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544 # similar to difflib.SequenceMatcher.get_matching_blocks |
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545 def get_matching_blocks(a, b): |
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546 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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547 |
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548 |
5367
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549 def trivialdiffheader(length): |
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550 return struct.pack(b">lll", 0, 0, length) if length else b'' |
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551 |
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552 |
24119
a5a06c9c7407
mdiff: add helper for making deltas which replace the full text of a revision
Mike Edgar <adgar@google.com>
parents:
23299
diff
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553 def replacediffheader(oldlen, newlen): |
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554 return struct.pack(b">lll", 0, oldlen, newlen) |