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annotate mercurial/mdiff.py @ 318:2819f63b16bf

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mdiff: revert grouping optimization for the time being -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 mdiff: revert grouping optimization for the time being This had trouble with Ted T'so import test while the original didn't. manifest hash: e2fc49b5277096bd4c5081558af5efe9964d5310 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCrHzXywK+sNU5EO8RArocAJwKlxrnyVpdYaKzgJG/b4gSVOYBTwCgkl2t zD807fsMULRDdDe1k9jVPcU= =Iivz -----END PGP SIGNATURE-----
author mpm@selenic.com
date Sun, 12 Jun 2005 10:20:07 -0800
parents b18ce742566a
children ad87e19854a6 27d08c0c2a7e
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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
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9 from mercurial.mpatch import *
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10
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11 def unidiff(a, ad, b, bd, fn):
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12 if not a and not b: return ""
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13
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14 if a == None:
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15 b = b.splitlines(1)
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16 l1 = "--- %s\t%s\n" % ("/dev/null", ad)
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17 l2 = "+++ %s\t%s\n" % ("b/" + fn, bd)
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18 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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19 l = [l1, l2, l3] + ["+" + e for e in b]
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20 elif b == None:
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21 a = a.splitlines(1)
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22 l1 = "--- %s\t%s\n" % ("a/" + fn, ad)
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23 l2 = "+++ %s\t%s\n" % ("/dev/null", bd)
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24 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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25 l = [l1, l2, l3] + ["-" + e for e in a]
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26 else:
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27 a = a.splitlines(1)
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28 b = b.splitlines(1)
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29 l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn))
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30 if not l: return ""
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31 # difflib uses a space, rather than a tab
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32 l[0] = l[0][:-2] + "\t" + ad + "\n"
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33 l[1] = l[1][:-2] + "\t" + bd + "\n"
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34
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35 for ln in xrange(len(l)):
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36 if l[ln][-1] != '\n':
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37 l[ln] += "\n\ No newline at end of file\n"
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38
0
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39 return "".join(l)
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40
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41 def textdiff(a, b):
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42 return diff(a.splitlines(1), b.splitlines(1))
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43
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44 def sortdiff(a, b):
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45 la = lb = 0
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46
0
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47 while 1:
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48 if la >= len(a) or lb >= len(b): break
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49 if b[lb] < a[la]:
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50 si = lb
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51 while lb < len(b) and b[lb] < a[la] : lb += 1
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52 yield "insert", la, la, si, lb
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53 elif a[la] < b[lb]:
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54 si = la
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55 while la < len(a) and a[la] < b[lb]: la += 1
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56 yield "delete", si, la, lb, lb
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57 else:
0
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58 la += 1
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59 lb += 1
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60
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61 if lb < len(b):
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62 yield "insert", la, la, lb, len(b)
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63
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64 if la < len(a):
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65 yield "delete", la, len(a), lb, lb
0
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66
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67 def diff(a, b, sorted=0):
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68 bin = []
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69 p = [0]
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70 for i in a: p.append(p[-1] + len(i))
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71
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72 if sorted:
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73 try:
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74 d = sortdiff(a, b)
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75 except:
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76 print a, b
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77 raise
0
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78 else:
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79 d = difflib.SequenceMatcher(None, a, b).get_opcodes()
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80
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81 for o, m, n, s, t in d:
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82 if o == 'equal': continue
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83 s = "".join(b[s:t])
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84 bin.append(struct.pack(">lll", p[m], p[n], len(s)) + s)
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85
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86 return "".join(bin)
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87
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88 def patchtext(bin):
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89 pos = 0
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90 t = []
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91 while pos < len(bin):
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92 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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93 pos += 12
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94 t.append(bin[pos:pos + l])
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95 pos += l
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96 return "".join(t)
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97
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98 def patch(a, bin):
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99 return patches(a, [bin])