Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/mdiff.py @ 2470:fe1689273f84

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
use demandload more.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Tue, 20 Jun 2006 23:58:21 -0700
parents 35fb62a3a673
children a20a1bb0c396
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 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 from demandload import demandload
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fe1689273f84 use demandload more.
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9 import bdiff, mpatch
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10 demandload(globals(), "re struct util")
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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 def unidiff(a, ad, b, bd, fn, r=None, text=False,
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23 showfunc=False, ignorews=False):
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24
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25 if not a and not b: return ""
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26 epoch = util.datestr((0, 0))
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27
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28 if not text and (util.binary(a) or util.binary(b)):
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29 l = ['Binary file %s has changed\n' % fn]
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30 elif not a:
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31 b = splitnewlines(b)
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32 if a is None:
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33 l1 = "--- %s\t%s\n" % ("/dev/null", epoch)
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34 else:
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35 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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36 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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37 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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38 l = [l1, l2, l3] + ["+" + e for e in b]
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39 elif not b:
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40 a = splitnewlines(a)
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41 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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42 if b is None:
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43 l2 = "+++ %s\t%s\n" % ("/dev/null", epoch)
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44 else:
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45 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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46 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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47 l = [l1, l2, l3] + ["-" + e for e in a]
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48 else:
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49 al = splitnewlines(a)
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50 bl = splitnewlines(b)
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51 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn,
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52 showfunc=showfunc, ignorews=ignorews))
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53 if not l: return ""
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54 # difflib uses a space, rather than a tab
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55 l[0] = "%s\t%s\n" % (l[0][:-2], ad)
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56 l[1] = "%s\t%s\n" % (l[1][:-2], bd)
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57
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58 for ln in xrange(len(l)):
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59 if l[ln][-1] != '\n':
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60 l[ln] += "\n\ No newline at end of file\n"
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61
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62 if r:
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63 l.insert(0, "diff %s %s\n" %
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64 (' '.join(["-r %s" % rev for rev in r]), fn))
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65
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66 return "".join(l)
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67
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68 # somewhat self contained replacement for difflib.unified_diff
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69 # t1 and t2 are the text to be diffed
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70 # l1 and l2 are the text broken up into lines
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71 # header1 and header2 are the filenames for the diff output
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72 # context is the number of context lines
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73 # showfunc enables diff -p output
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74 # ignorews ignores all whitespace changes in the diff
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75 def bunidiff(t1, t2, l1, l2, header1, header2, context=3, showfunc=False,
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76 ignorews=False):
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77 def contextend(l, len):
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78 ret = l + context
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79 if ret > len:
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80 ret = len
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81 return ret
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82
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83 def contextstart(l):
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84 ret = l - context
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85 if ret < 0:
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86 return 0
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87 return ret
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88
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89 def yieldhunk(hunk, header):
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90 if header:
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91 for x in header:
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92 yield x
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93 (astart, a2, bstart, b2, delta) = hunk
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94 aend = contextend(a2, len(l1))
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95 alen = aend - astart
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96 blen = b2 - bstart + aend - a2
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97
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98 func = ""
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99 if showfunc:
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100 # walk backwards from the start of the context
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101 # to find a line starting with an alphanumeric char.
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102 for x in xrange(astart, -1, -1):
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103 t = l1[x].rstrip()
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104 if funcre.match(t):
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105 func = ' ' + t[:40]
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106 break
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107
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108 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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109 bstart + 1, blen, func)
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110 for x in delta:
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111 yield x
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112 for x in xrange(a2, aend):
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113 yield ' ' + l1[x]
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114
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115 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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116
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117 if showfunc:
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118 funcre = re.compile('\w')
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119 if ignorews:
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120 wsre = re.compile('[ \t]')
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121
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122 # bdiff.blocks gives us the matching sequences in the files. The loop
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123 # below finds the spaces between those matching sequences and translates
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124 # them into diff output.
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125 #
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126 diff = bdiff.blocks(t1, t2)
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127 hunk = None
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128 for i in xrange(len(diff)):
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129 # The first match is special.
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130 # we've either found a match starting at line 0 or a match later
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131 # in the file. If it starts later, old and new below will both be
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132 # empty and we'll continue to the next match.
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133 if i > 0:
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134 s = diff[i-1]
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135 else:
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136 s = [0, 0, 0, 0]
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137 delta = []
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138 s1 = diff[i]
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139 a1 = s[1]
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140 a2 = s1[0]
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141 b1 = s[3]
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142 b2 = s1[2]
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143
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144 old = l1[a1:a2]
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145 new = l2[b1:b2]
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146
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147 # bdiff sometimes gives huge matches past eof, this check eats them,
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148 # and deals with the special first match case described above
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149 if not old and not new:
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150 continue
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151
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152 if ignorews:
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153 wsold = wsre.sub('', "".join(old))
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154 wsnew = wsre.sub('', "".join(new))
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155 if wsold == wsnew:
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156 continue
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157
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158 astart = contextstart(a1)
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159 bstart = contextstart(b1)
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160 prev = None
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161 if hunk:
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162 # join with the previous hunk if it falls inside the context
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163 if astart < hunk[1] + context + 1:
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164 prev = hunk
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165 astart = hunk[1]
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166 bstart = hunk[3]
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167 else:
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168 for x in yieldhunk(hunk, header):
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169 yield x
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170 # we only want to yield the header if the files differ, and
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171 # we only want to yield it once.
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172 header = None
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173 if prev:
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174 # we've joined the previous hunk, record the new ending points.
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175 hunk[1] = a2
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176 hunk[3] = b2
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177 delta = hunk[4]
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178 else:
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179 # create a new hunk
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180 hunk = [ astart, a2, bstart, b2, delta ]
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181
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182 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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183 delta[len(delta):] = [ '-' + x for x in old ]
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184 delta[len(delta):] = [ '+' + x for x in new ]
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185
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186 if hunk:
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187 for x in yieldhunk(hunk, header):
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188 yield x
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189
120
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190 def patchtext(bin):
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191 pos = 0
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192 t = []
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193 while pos < len(bin):
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194 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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195 pos += 12
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196 t.append(bin[pos:pos + l])
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197 pos += l
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198 return "".join(t)
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199
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200 def patch(a, bin):
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201 return mpatch.patches(a, [bin])
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202
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203 patches = mpatch.patches
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204 patchedsize = mpatch.patchedsize
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205 textdiff = bdiff.bdiff