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