Mercurial > hg
annotate mercurial/mdiff.py @ 24946:c44534209a0a
bookmarks: rename readcurrent to readactive (API)
Today, the terms 'active' and 'current' are interchangeably used throughout the
codebase in reference to the active bookmark (the bookmark that will be updated
with the next commit). This leads to confusion among developers and users.
This patch is part of a series to standardize the usage to 'active' throughout
the mercurial codebase and user interface.
author | Ryan McElroy <rmcelroy@fb.com> |
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date | Mon, 13 Apr 2015 23:03:13 -0700 |
parents | a5a06c9c7407 |
children | 56b2bcea2529 |
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 i18n import _ |
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9 import bdiff, mpatch, util, base85 |
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10 import re, struct, zlib |
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11 |
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12 def splitnewlines(text): |
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13 '''like str.splitlines, but only split on newlines.''' |
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14 lines = [l + '\n' for l in text.split('\n')] |
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15 if lines: |
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16 if lines[-1] == '\n': |
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17 lines.pop() |
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18 else: |
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19 lines[-1] = lines[-1][:-1] |
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20 return lines |
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21 |
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22 class diffopts(object): |
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23 '''context is the number of context lines |
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24 text treats all files as text |
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25 showfunc enables diff -p output |
2907 | 26 git enables the git extended patch format |
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27 nodates removes dates from diff headers |
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28 nobinary ignores binary files |
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29 noprefix disables the 'a/' and 'b/' prefixes (ignored in plain mode) |
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30 ignorews ignores all whitespace changes in the diff |
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31 ignorewsamount ignores changes in the amount of whitespace |
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32 ignoreblanklines ignores changes whose lines are all blank |
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33 upgrade generates git diffs to avoid data loss |
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34 ''' |
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35 |
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36 defaults = { |
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37 'context': 3, |
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38 'text': False, |
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39 'showfunc': False, |
2907 | 40 'git': False, |
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41 'nodates': False, |
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42 'nobinary': False, |
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43 'noprefix': False, |
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44 'ignorews': False, |
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45 'ignorewsamount': False, |
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46 'ignoreblanklines': False, |
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47 'upgrade': False, |
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48 } |
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49 |
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50 __slots__ = defaults.keys() |
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51 |
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52 def __init__(self, **opts): |
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53 for k in self.__slots__: |
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54 v = opts.get(k) |
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55 if v is None: |
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56 v = self.defaults[k] |
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57 setattr(self, k, v) |
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58 |
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59 try: |
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60 self.context = int(self.context) |
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61 except ValueError: |
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62 raise util.Abort(_('diff context lines count must be ' |
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63 'an integer, not %r') % self.context) |
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64 |
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65 def copy(self, **kwargs): |
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66 opts = dict((k, getattr(self, k)) for k in self.defaults) |
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67 opts.update(kwargs) |
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68 return diffopts(**opts) |
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69 |
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70 defaultopts = diffopts() |
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71 |
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72 def wsclean(opts, text, blank=True): |
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73 if opts.ignorews: |
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74 text = bdiff.fixws(text, 1) |
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75 elif opts.ignorewsamount: |
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76 text = bdiff.fixws(text, 0) |
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77 if blank and opts.ignoreblanklines: |
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78 text = re.sub('\n+', '\n', text).strip('\n') |
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79 return text |
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80 |
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81 def splitblock(base1, lines1, base2, lines2, opts): |
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82 # The input lines matches except for interwoven blank lines. We |
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83 # transform it into a sequence of matching blocks and blank blocks. |
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84 lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1] |
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85 lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2] |
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86 s1, e1 = 0, len(lines1) |
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87 s2, e2 = 0, len(lines2) |
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88 while s1 < e1 or s2 < e2: |
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89 i1, i2, btype = s1, s2, '=' |
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90 if (i1 >= e1 or lines1[i1] == 0 |
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91 or i2 >= e2 or lines2[i2] == 0): |
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92 # Consume the block of blank lines |
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93 btype = '~' |
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94 while i1 < e1 and lines1[i1] == 0: |
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95 i1 += 1 |
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96 while i2 < e2 and lines2[i2] == 0: |
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97 i2 += 1 |
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98 else: |
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99 # Consume the matching lines |
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100 while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1: |
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101 i1 += 1 |
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102 i2 += 1 |
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103 yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype |
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104 s1 = i1 |
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105 s2 = i2 |
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106 |
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107 def allblocks(text1, text2, opts=None, lines1=None, lines2=None, refine=False): |
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108 """Return (block, type) tuples, where block is an mdiff.blocks |
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109 line entry. type is '=' for blocks matching exactly one another |
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110 (bdiff blocks), '!' for non-matching blocks and '~' for blocks |
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111 matching only after having filtered blank lines. If refine is True, |
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112 then '~' blocks are refined and are only made of blank lines. |
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113 line1 and line2 are text1 and text2 split with splitnewlines() if |
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114 they are already available. |
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115 """ |
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116 if opts is None: |
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117 opts = defaultopts |
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118 if opts.ignorews or opts.ignorewsamount: |
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119 text1 = wsclean(opts, text1, False) |
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120 text2 = wsclean(opts, text2, False) |
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121 diff = bdiff.blocks(text1, text2) |
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122 for i, s1 in enumerate(diff): |
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123 # The first match is special. |
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124 # we've either found a match starting at line 0 or a match later |
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125 # in the file. If it starts later, old and new below will both be |
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126 # empty and we'll continue to the next match. |
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127 if i > 0: |
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128 s = diff[i - 1] |
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129 else: |
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130 s = [0, 0, 0, 0] |
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131 s = [s[1], s1[0], s[3], s1[2]] |
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132 |
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133 # bdiff sometimes gives huge matches past eof, this check eats them, |
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134 # and deals with the special first match case described above |
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135 if s[0] != s[1] or s[2] != s[3]: |
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136 type = '!' |
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137 if opts.ignoreblanklines: |
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138 if lines1 is None: |
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139 lines1 = splitnewlines(text1) |
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140 if lines2 is None: |
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141 lines2 = splitnewlines(text2) |
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142 old = wsclean(opts, "".join(lines1[s[0]:s[1]])) |
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143 new = wsclean(opts, "".join(lines2[s[2]:s[3]])) |
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144 if old == new: |
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145 type = '~' |
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146 yield s, type |
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147 yield s1, '=' |
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148 |
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149 def unidiff(a, ad, b, bd, fn1, fn2, opts=defaultopts): |
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150 def datetag(date, fn=None): |
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151 if not opts.git and not opts.nodates: |
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152 return '\t%s\n' % date |
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153 if fn and ' ' in fn: |
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154 return '\t\n' |
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155 return '\n' |
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156 |
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157 if not a and not b: |
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158 return "" |
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159 |
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160 if opts.noprefix: |
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161 aprefix = bprefix = '' |
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162 else: |
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163 aprefix = 'a/' |
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164 bprefix = 'b/' |
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165 |
1379 | 166 epoch = util.datestr((0, 0)) |
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167 |
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168 fn1 = util.pconvert(fn1) |
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169 fn2 = util.pconvert(fn2) |
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170 |
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171 if not opts.text and (util.binary(a) or util.binary(b)): |
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172 if a and b and len(a) == len(b) and a == b: |
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173 return "" |
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174 l = ['Binary file %s has changed\n' % fn1] |
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175 elif not a: |
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176 b = splitnewlines(b) |
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177 if a is None: |
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178 l1 = '--- /dev/null%s' % datetag(epoch) |
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179 else: |
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180 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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181 l2 = "+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) |
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182 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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183 l = [l1, l2, l3] + ["+" + e for e in b] |
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184 elif not b: |
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185 a = splitnewlines(a) |
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186 l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) |
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187 if b is None: |
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188 l2 = '+++ /dev/null%s' % datetag(epoch) |
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189 else: |
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190 l2 = "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) |
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191 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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192 l = [l1, l2, l3] + ["-" + e for e in a] |
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193 else: |
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194 al = splitnewlines(a) |
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195 bl = splitnewlines(b) |
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196 l = list(_unidiff(a, b, al, bl, opts=opts)) |
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197 if not l: |
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198 return "" |
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199 |
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200 l.insert(0, "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))) |
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201 l.insert(1, "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2))) |
170 | 202 |
203 for ln in xrange(len(l)): | |
204 if l[ln][-1] != '\n': | |
205 l[ln] += "\n\ No newline at end of file\n" | |
206 | |
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207 return "".join(l) |
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208 |
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209 # creates a headerless unified diff |
1637 | 210 # t1 and t2 are the text to be diffed |
211 # l1 and l2 are the text broken up into lines | |
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212 def _unidiff(t1, t2, l1, l2, opts=defaultopts): |
1637 | 213 def contextend(l, len): |
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214 ret = l + opts.context |
1637 | 215 if ret > len: |
216 ret = len | |
217 return ret | |
218 | |
219 def contextstart(l): | |
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220 ret = l - opts.context |
1637 | 221 if ret < 0: |
222 return 0 | |
223 return ret | |
224 | |
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225 lastfunc = [0, ''] |
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226 def yieldhunk(hunk): |
1637 | 227 (astart, a2, bstart, b2, delta) = hunk |
228 aend = contextend(a2, len(l1)) | |
229 alen = aend - astart | |
230 blen = b2 - bstart + aend - a2 | |
231 | |
232 func = "" | |
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233 if opts.showfunc: |
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234 lastpos, func = lastfunc |
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235 # walk backwards from the start of the context up to the start of |
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236 # the previous hunk context until we find a line starting with an |
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237 # alphanumeric char. |
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238 for i in xrange(astart - 1, lastpos - 1, -1): |
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239 if l1[i][0].isalnum(): |
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240 func = ' ' + l1[i].rstrip()[:40] |
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241 lastfunc[1] = func |
1637 | 242 break |
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243 # by recording this hunk's starting point as the next place to |
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244 # start looking for function lines, we avoid reading any line in |
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245 # the file more than once. |
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246 lastfunc[0] = astart |
1637 | 247 |
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248 # zero-length hunk ranges report their start line as one less |
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249 if alen: |
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250 astart += 1 |
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251 if blen: |
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252 bstart += 1 |
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253 |
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254 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart, alen, |
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255 bstart, blen, func) |
1637 | 256 for x in delta: |
257 yield x | |
258 for x in xrange(a2, aend): | |
259 yield ' ' + l1[x] | |
260 | |
261 # bdiff.blocks gives us the matching sequences in the files. The loop | |
262 # below finds the spaces between those matching sequences and translates | |
263 # them into diff output. | |
264 # | |
265 hunk = None | |
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266 ignoredlines = 0 |
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267 for s, stype in allblocks(t1, t2, opts, l1, l2): |
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268 a1, a2, b1, b2 = s |
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269 if stype != '!': |
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270 if stype == '~': |
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271 # The diff context lines are based on t1 content. When |
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272 # blank lines are ignored, the new lines offsets must |
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273 # be adjusted as if equivalent blocks ('~') had the |
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274 # same sizes on both sides. |
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275 ignoredlines += (b2 - b1) - (a2 - a1) |
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276 continue |
1637 | 277 delta = [] |
278 old = l1[a1:a2] | |
279 new = l2[b1:b2] | |
280 | |
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281 b1 -= ignoredlines |
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282 b2 -= ignoredlines |
1637 | 283 astart = contextstart(a1) |
284 bstart = contextstart(b1) | |
285 prev = None | |
286 if hunk: | |
287 # join with the previous hunk if it falls inside the context | |
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288 if astart < hunk[1] + opts.context + 1: |
1637 | 289 prev = hunk |
290 astart = hunk[1] | |
291 bstart = hunk[3] | |
292 else: | |
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293 for x in yieldhunk(hunk): |
1637 | 294 yield x |
295 if prev: | |
296 # we've joined the previous hunk, record the new ending points. | |
297 hunk[1] = a2 | |
298 hunk[3] = b2 | |
299 delta = hunk[4] | |
300 else: | |
301 # create a new hunk | |
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302 hunk = [astart, a2, bstart, b2, delta] |
1637 | 303 |
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304 delta[len(delta):] = [' ' + x for x in l1[astart:a1]] |
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305 delta[len(delta):] = ['-' + x for x in old] |
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306 delta[len(delta):] = ['+' + x for x in new] |
1637 | 307 |
308 if hunk: | |
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309 for x in yieldhunk(hunk): |
1637 | 310 yield x |
311 | |
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312 def b85diff(to, tn): |
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313 '''print base85-encoded binary diff''' |
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314 def fmtline(line): |
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315 l = len(line) |
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316 if l <= 26: |
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317 l = chr(ord('A') + l - 1) |
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318 else: |
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319 l = chr(l - 26 + ord('a') - 1) |
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320 return '%c%s\n' % (l, base85.b85encode(line, True)) |
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321 |
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322 def chunk(text, csize=52): |
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323 l = len(text) |
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324 i = 0 |
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325 while i < l: |
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326 yield text[i:i + csize] |
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327 i += csize |
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328 |
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329 if to is None: |
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330 to = '' |
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331 if tn is None: |
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332 tn = '' |
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333 |
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334 if to == tn: |
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335 return '' |
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336 |
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337 # TODO: deltas |
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338 ret = [] |
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339 ret.append('GIT binary patch\n') |
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340 ret.append('literal %s\n' % len(tn)) |
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341 for l in chunk(zlib.compress(tn)): |
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342 ret.append(fmtline(l)) |
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343 ret.append('\n') |
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344 |
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345 return ''.join(ret) |
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346 |
120
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347 def patchtext(bin): |
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348 pos = 0 |
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349 t = [] |
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350 while pos < len(bin): |
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351 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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352 pos += 12 |
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353 t.append(bin[pos:pos + l]) |
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354 pos += l |
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355 return "".join(t) |
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356 |
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357 def patch(a, bin): |
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358 if len(a) == 0: |
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359 # skip over trivial delta header |
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360 return util.buffer(bin, 12) |
1379 | 361 return mpatch.patches(a, [bin]) |
432 | 362 |
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363 # similar to difflib.SequenceMatcher.get_matching_blocks |
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364 def get_matching_blocks(a, b): |
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365 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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366 |
5367
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367 def trivialdiffheader(length): |
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368 return struct.pack(">lll", 0, 0, length) |
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369 |
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370 def replacediffheader(oldlen, newlen): |
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371 return struct.pack(">lll", 0, oldlen, newlen) |
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372 |
1379 | 373 patches = mpatch.patches |
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374 patchedsize = mpatch.patchedsize |
432 | 375 textdiff = bdiff.bdiff |