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annotate mercurial/mdiff.py @ 2105:21cf3fe64e27

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Merge with cmason
author Matt Mackall <mpm@selenic.com>
date Thu, 20 Apr 2006 12:12:03 -0500
parents 441ea218414e
children b914f0557832
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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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9 import struct, bdiff, util, mpatch
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10 demandload(globals(), "re")
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12
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13 def unidiff(a, ad, b, bd, fn, r=None, text=False,
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14 showfunc=False, ignorews=False):
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15
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16 if not a and not b: return ""
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17 epoch = util.datestr((0, 0))
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18
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19 if not text and (util.binary(a) or util.binary(b)):
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20 l = ['Binary file %s has changed\n' % fn]
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21 elif not a:
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22 b = b.splitlines(1)
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23 if a is None:
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24 l1 = "--- %s\t%s\n" % ("/dev/null", epoch)
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25 else:
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26 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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27 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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28 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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29 l = [l1, l2, l3] + ["+" + e for e in b]
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30 elif not b:
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31 a = a.splitlines(1)
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32 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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33 if b is None:
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34 l2 = "+++ %s\t%s\n" % ("/dev/null", epoch)
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35 else:
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36 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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37 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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38 l = [l1, l2, l3] + ["-" + e for e in a]
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39 else:
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40 al = a.splitlines(1)
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41 bl = b.splitlines(1)
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42 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn,
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43 showfunc=showfunc, ignorews=ignorews))
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44 if not l: return ""
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45 # difflib uses a space, rather than a tab
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46 l[0] = "%s\t%s\n" % (l[0][:-2], ad)
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47 l[1] = "%s\t%s\n" % (l[1][:-2], bd)
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48
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49 for ln in xrange(len(l)):
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50 if l[ln][-1] != '\n':
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51 l[ln] += "\n\ No newline at end of file\n"
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52
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53 if r:
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54 l.insert(0, "diff %s %s\n" %
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55 (' '.join(["-r %s" % rev for rev in r]), fn))
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56
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57 return "".join(l)
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58
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59 # somewhat self contained replacement for difflib.unified_diff
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60 # t1 and t2 are the text to be diffed
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61 # l1 and l2 are the text broken up into lines
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62 # header1 and header2 are the filenames for the diff output
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63 # context is the number of context lines
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64 # showfunc enables diff -p output
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65 # ignorews ignores all whitespace changes in the diff
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66 def bunidiff(t1, t2, l1, l2, header1, header2, context=3, showfunc=False,
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67 ignorews=False):
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68 def contextend(l, len):
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69 ret = l + context
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70 if ret > len:
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71 ret = len
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72 return ret
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73
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74 def contextstart(l):
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75 ret = l - context
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76 if ret < 0:
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77 return 0
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78 return ret
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79
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80 def yieldhunk(hunk, header):
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81 if header:
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82 for x in header:
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83 yield x
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84 (astart, a2, bstart, b2, delta) = hunk
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85 aend = contextend(a2, len(l1))
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86 alen = aend - astart
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87 blen = b2 - bstart + aend - a2
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88
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89 func = ""
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90 if showfunc:
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91 # walk backwards from the start of the context
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92 # to find a line starting with an alphanumeric char.
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93 for x in xrange(astart, -1, -1):
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94 t = l1[x].rstrip()
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95 if funcre.match(t):
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96 func = ' ' + t[:40]
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97 break
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98
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99 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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100 bstart + 1, blen, func)
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101 for x in delta:
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102 yield x
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103 for x in xrange(a2, aend):
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104 yield ' ' + l1[x]
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105
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106 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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107
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108 if showfunc:
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109 funcre = re.compile('\w')
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110 if ignorews:
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111 wsre = re.compile('[ \t]')
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112
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113 # bdiff.blocks gives us the matching sequences in the files. The loop
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114 # below finds the spaces between those matching sequences and translates
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115 # them into diff output.
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116 #
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117 diff = bdiff.blocks(t1, t2)
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118 hunk = None
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119 for i in xrange(len(diff)):
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120 # The first match is special.
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121 # we've either found a match starting at line 0 or a match later
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122 # in the file. If it starts later, old and new below will both be
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123 # empty and we'll continue to the next match.
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124 if i > 0:
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125 s = diff[i-1]
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126 else:
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127 s = [0, 0, 0, 0]
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128 delta = []
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129 s1 = diff[i]
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130 a1 = s[1]
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131 a2 = s1[0]
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132 b1 = s[3]
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133 b2 = s1[2]
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134
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135 old = l1[a1:a2]
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136 new = l2[b1:b2]
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137
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138 # bdiff sometimes gives huge matches past eof, this check eats them,
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139 # and deals with the special first match case described above
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140 if not old and not new:
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141 continue
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142
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143 if ignorews:
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144 wsold = wsre.sub('', "".join(old))
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145 wsnew = wsre.sub('', "".join(new))
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146 if wsold == wsnew:
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147 continue
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148
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149 astart = contextstart(a1)
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150 bstart = contextstart(b1)
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151 prev = None
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152 if hunk:
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153 # join with the previous hunk if it falls inside the context
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154 if astart < hunk[1] + context + 1:
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155 prev = hunk
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156 astart = hunk[1]
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157 bstart = hunk[3]
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158 else:
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159 for x in yieldhunk(hunk, header):
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160 yield x
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161 # we only want to yield the header if the files differ, and
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162 # we only want to yield it once.
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163 header = None
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164 if prev:
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165 # we've joined the previous hunk, record the new ending points.
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166 hunk[1] = a2
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167 hunk[3] = b2
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168 delta = hunk[4]
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169 else:
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170 # create a new hunk
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171 hunk = [ astart, a2, bstart, b2, delta ]
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172
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173 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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174 delta[len(delta):] = [ '-' + x for x in old ]
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175 delta[len(delta):] = [ '+' + x for x in new ]
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176
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177 if hunk:
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178 for x in yieldhunk(hunk, header):
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179 yield x
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180
120
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181 def patchtext(bin):
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182 pos = 0
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183 t = []
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184 while pos < len(bin):
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185 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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186 pos += 12
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187 t.append(bin[pos:pos + l])
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188 pos += l
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189 return "".join(t)
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190
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191 def patch(a, bin):
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192 return mpatch.patches(a, [bin])
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193
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194 patches = mpatch.patches
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195 patchedsize = mpatch.patchedsize
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196 textdiff = bdiff.bdiff