Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/mdiff.py @ 5447:56591846f819

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chunkiter: simplify iter logic
author Matt Mackall <mpm@selenic.com>
date Thu, 11 Oct 2007 00:46:49 -0500
parents 7530334bf301
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
239
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1 # mdiff.py - diff and patch routines for mercurial
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2 #
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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
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 import bdiff, mpatch, re, struct, util, md5
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9
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10 def splitnewlines(text):
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11 '''like str.splitlines, but only split on newlines.'''
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12 lines = [l + '\n' for l in text.split('\n')]
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13 if lines:
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14 if lines[-1] == '\n':
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15 lines.pop()
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16 else:
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17 lines[-1] = lines[-1][:-1]
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18 return lines
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19
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20 class diffopts(object):
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21 '''context is the number of context lines
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22 text treats all files as text
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23 showfunc enables diff -p output
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24 git enables the git extended patch format
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25 nodates removes dates from diff headers
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26 ignorews ignores all whitespace changes in the diff
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27 ignorewsamount ignores changes in the amount of whitespace
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28 ignoreblanklines ignores changes whose lines are all blank'''
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29
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30 defaults = {
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31 'context': 3,
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32 'text': False,
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33 'showfunc': True,
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34 'git': False,
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35 'nodates': False,
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36 'ignorews': False,
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37 'ignorewsamount': False,
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38 'ignoreblanklines': False,
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39 }
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40
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41 __slots__ = defaults.keys()
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42
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43 def __init__(self, **opts):
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44 for k in self.__slots__:
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45 v = opts.get(k)
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46 if v is None:
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47 v = self.defaults[k]
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48 setattr(self, k, v)
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49
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50 defaultopts = diffopts()
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51
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52 def wsclean(opts, text):
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53 if opts.ignorews:
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54 text = re.sub('[ \t]+', '', text)
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55 elif opts.ignorewsamount:
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56 text = re.sub('[ \t]+', ' ', text)
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57 text = re.sub('[ \t]+\n', '\n', text)
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58 if opts.ignoreblanklines:
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59 text = re.sub('\n+', '', text)
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60 return text
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61
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62 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts):
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63 def datetag(date, addtab=True):
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64 if not opts.git and not opts.nodates:
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65 return '\t%s\n' % date
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66 if addtab and ' ' in fn:
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67 return '\t\n'
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68 return '\n'
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69
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70 if not a and not b: return ""
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71 epoch = util.datestr((0, 0))
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72
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73 if not opts.text and (util.binary(a) or util.binary(b)):
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74 def h(v):
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75 # md5 is used instead of sha1 because md5 is supposedly faster
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76 return md5.new(v).digest()
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77 if a and b and len(a) == len(b) and h(a) == h(b):
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78 return ""
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79 l = ['Binary file %s has changed\n' % fn]
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80 elif not a:
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81 b = splitnewlines(b)
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82 if a is None:
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83 l1 = '--- /dev/null%s' % datetag(epoch, False)
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84 else:
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85 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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86 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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87 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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88 l = [l1, l2, l3] + ["+" + e for e in b]
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89 elif not b:
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90 a = splitnewlines(a)
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91 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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92 if b is None:
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93 l2 = '+++ /dev/null%s' % datetag(epoch, False)
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94 else:
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95 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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96 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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97 l = [l1, l2, l3] + ["-" + e for e in a]
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98 else:
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99 al = splitnewlines(a)
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100 bl = splitnewlines(b)
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101 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts))
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102 if not l: return ""
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103 # difflib uses a space, rather than a tab
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104 l[0] = "%s%s" % (l[0][:-2], datetag(ad))
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105 l[1] = "%s%s" % (l[1][:-2], datetag(bd))
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106
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107 for ln in xrange(len(l)):
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108 if l[ln][-1] != '\n':
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109 l[ln] += "\n\ No newline at end of file\n"
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110
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111 if r:
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112 l.insert(0, "diff %s %s\n" %
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113 (' '.join(["-r %s" % rev for rev in r]), fn))
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114
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115 return "".join(l)
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116
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117 # somewhat self contained replacement for difflib.unified_diff
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118 # t1 and t2 are the text to be diffed
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119 # l1 and l2 are the text broken up into lines
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120 # header1 and header2 are the filenames for the diff output
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121 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts):
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122 def contextend(l, len):
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123 ret = l + opts.context
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124 if ret > len:
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125 ret = len
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126 return ret
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127
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128 def contextstart(l):
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129 ret = l - opts.context
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130 if ret < 0:
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131 return 0
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132 return ret
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133
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134 def yieldhunk(hunk, header):
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135 if header:
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136 for x in header:
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137 yield x
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138 (astart, a2, bstart, b2, delta) = hunk
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139 aend = contextend(a2, len(l1))
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140 alen = aend - astart
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141 blen = b2 - bstart + aend - a2
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142
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143 func = ""
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144 if opts.showfunc:
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145 # walk backwards from the start of the context
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146 # to find a line starting with an alphanumeric char.
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147 for x in xrange(astart, -1, -1):
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148 t = l1[x].rstrip()
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149 if funcre.match(t):
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150 func = ' ' + t[:40]
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151 break
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152
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153 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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154 bstart + 1, blen, func)
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155 for x in delta:
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156 yield x
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157 for x in xrange(a2, aend):
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158 yield ' ' + l1[x]
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159
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160 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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161
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162 if opts.showfunc:
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163 funcre = re.compile('\w')
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164
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165 # bdiff.blocks gives us the matching sequences in the files. The loop
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166 # below finds the spaces between those matching sequences and translates
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167 # them into diff output.
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168 #
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169 diff = bdiff.blocks(t1, t2)
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170 hunk = None
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171 for i in xrange(len(diff)):
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172 # The first match is special.
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173 # we've either found a match starting at line 0 or a match later
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174 # in the file. If it starts later, old and new below will both be
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175 # empty and we'll continue to the next match.
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176 if i > 0:
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177 s = diff[i-1]
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178 else:
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179 s = [0, 0, 0, 0]
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180 delta = []
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181 s1 = diff[i]
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182 a1 = s[1]
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183 a2 = s1[0]
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184 b1 = s[3]
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185 b2 = s1[2]
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186
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187 old = l1[a1:a2]
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188 new = l2[b1:b2]
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189
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190 # bdiff sometimes gives huge matches past eof, this check eats them,
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191 # and deals with the special first match case described above
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192 if not old and not new:
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193 continue
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194
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195 if opts.ignorews or opts.ignorewsamount or opts.ignoreblanklines:
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196 if wsclean(opts, "".join(old)) == wsclean(opts, "".join(new)):
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197 continue
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198
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199 astart = contextstart(a1)
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200 bstart = contextstart(b1)
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201 prev = None
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202 if hunk:
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203 # join with the previous hunk if it falls inside the context
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204 if astart < hunk[1] + opts.context + 1:
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205 prev = hunk
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206 astart = hunk[1]
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207 bstart = hunk[3]
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208 else:
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209 for x in yieldhunk(hunk, header):
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210 yield x
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211 # we only want to yield the header if the files differ, and
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212 # we only want to yield it once.
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213 header = None
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214 if prev:
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215 # we've joined the previous hunk, record the new ending points.
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216 hunk[1] = a2
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217 hunk[3] = b2
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218 delta = hunk[4]
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219 else:
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220 # create a new hunk
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221 hunk = [ astart, a2, bstart, b2, delta ]
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222
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223 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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224 delta[len(delta):] = [ '-' + x for x in old ]
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225 delta[len(delta):] = [ '+' + x for x in new ]
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226
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227 if hunk:
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228 for x in yieldhunk(hunk, header):
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229 yield x
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diff changeset
230
120
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diff changeset
231 def patchtext(bin):
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diff changeset
232 pos = 0
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233 t = []
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diff changeset
234 while pos < len(bin):
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diff changeset
235 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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diff changeset
236 pos += 12
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diff changeset
237 t.append(bin[pos:pos + l])
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diff changeset
238 pos += l
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diff changeset
239 return "".join(t)
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diff changeset
240
0
9117c6561b0b Add back links from file revisions to changeset revisions
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diff changeset
241 def patch(a, bin):
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242 return mpatch.patches(a, [bin])
432
3b9e3d3d2810 Start using bdiff for generating deltas
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diff changeset
243
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99c853a1408c add mdiff.get_matching_blocks
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diff changeset
244 # similar to difflib.SequenceMatcher.get_matching_blocks
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diff changeset
245 def get_matching_blocks(a, b):
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diff changeset
246 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)]
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diff changeset
247
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7530334bf301 revlog: generate trivial deltas against null revision
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diff changeset
248 def trivialdiffheader(length):
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diff changeset
249 return struct.pack(">lll", 0, 0, length)
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diff changeset
250
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diff changeset
251 patches = mpatch.patches
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diff changeset
252 patchedsize = mpatch.patchedsize
432
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diff changeset
253 textdiff = bdiff.bdiff