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annotate mercurial/mdiff.py @ 432:3b9e3d3d2810

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Start using bdiff for generating deltas -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Start using bdiff for generating deltas manifest hash: bf6ed7d17d96810b7f40b50811b104b568c64b4b -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCubqVywK+sNU5EO8RAor6AKCm8Zqg0DIhLzaMPp5/GKPKk/GjKwCfbCe+ /CBmpvcTxSJofY9RE08cCVY= =2yu2 -----END PGP SIGNATURE-----
author mpm@selenic.com
date Wed, 22 Jun 2005 11:23:01 -0800
parents 8f8bb77d560e
children 03f27b1381f9
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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 import difflib, struct, bdiff
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9 from mpatch import *
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10
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11 def unidiff(a, ad, b, bd, fn, r=None):
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12
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13 if not a and not b: return ""
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14
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15 if a == None:
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16 b = b.splitlines(1)
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17 l1 = "--- %s\t%s\n" % ("/dev/null", ad)
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18 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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19 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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20 l = [l1, l2, l3] + ["+" + e for e in b]
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21 elif b == None:
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22 a = a.splitlines(1)
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23 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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24 l2 = "+++ %s\t%s\n" % ("/dev/null", bd)
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25 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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26 l = [l1, l2, l3] + ["-" + e for e in a]
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27 else:
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28 a = a.splitlines(1)
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29 b = b.splitlines(1)
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30 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn))
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31 if not l: return ""
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32 # difflib uses a space, rather than a tab
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33 l[0] = l[0][:-2] + "\t" + ad + "\n"
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34 l[1] = l[1][:-2] + "\t" + bd + "\n"
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35
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36 for ln in xrange(len(l)):
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37 if l[ln][-1] != '\n':
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38 l[ln] += "\n\ No newline at end of file\n"
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39
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40 if r:
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41 l.insert(0, "diff %s %s\n" %
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42 (' '.join(["-r %s" % rev for rev in r]), fn))
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43
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44 return "".join(l)
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45
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46 def sortdiff(a, b):
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47 la = lb = 0
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48 lena = len(a)
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49 lenb = len(b)
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50
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51 while 1:
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52 am, bm, = la, lb
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53
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54 # walk over matching lines
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55 while lb < lenb and la < lena and a[la] == b[lb] :
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56 la += 1
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57 lb += 1
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58
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59 if la > am:
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60 yield (am, bm, la - am) # return a match
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61
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62 # skip mismatched lines from b
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63 while la < lena and lb < lenb and b[lb] < a[la]:
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64 lb += 1
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65
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66 if lb >= lenb:
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67 break
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68
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69 # skip mismatched lines from a
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70 while la < lena and lb < lenb and b[lb] > a[la]:
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71 la += 1
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72
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73 if la >= lena:
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74 break
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75
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76 yield (lena, lenb, 0)
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77
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78 def diff(a, b, sorted=0):
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79 if not a:
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80 s = "".join(b)
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81 return s and (struct.pack(">lll", 0, 0, len(s)) + s)
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82
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83 bin = []
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84 p = [0]
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85 for i in a: p.append(p[-1] + len(i))
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86
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87 if sorted:
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88 try:
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89 d = sortdiff(a, b)
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90 except:
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91 print a, b
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92 raise
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93 else:
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94 d = difflib.SequenceMatcher(None, a, b).get_matching_blocks()
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95 la = 0
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96 lb = 0
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97 for am, bm, size in d:
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98 s = "".join(b[lb:bm])
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99 if am > la or s:
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100 bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s)
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101 la = am + size
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102 lb = bm + size
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103
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104 return "".join(bin)
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105
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106 def patchtext(bin):
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107 pos = 0
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108 t = []
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109 while pos < len(bin):
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110 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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111 pos += 12
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112 t.append(bin[pos:pos + l])
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113 pos += l
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114 return "".join(t)
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115
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116 def patch(a, bin):
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117 return patches(a, [bin])
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118
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119 textdiff = bdiff.bdiff
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