Mercurial > hg
annotate mercurial/mdiff.py @ 8225:46293a0c7e9f
updated license to be explicit about GPL version 2
author | Martin Geisler <mg@lazybytes.net> |
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date | Sun, 26 Apr 2009 01:08:54 +0200 |
parents | 07faba78cf5a |
children | b87a50b7125c |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2859 | 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 of the |
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6 # GNU General Public License version 2, incorporated herein by reference. |
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7 |
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8 from i18n import _ |
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9 import bdiff, mpatch, re, struct, util |
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10 |
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11 def splitnewlines(text): |
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12 '''like str.splitlines, but only split on newlines.''' |
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13 lines = [l + '\n' for l in text.split('\n')] |
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14 if lines: |
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15 if lines[-1] == '\n': |
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16 lines.pop() |
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17 else: |
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18 lines[-1] = lines[-1][:-1] |
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19 return lines |
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20 |
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21 class diffopts(object): |
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22 '''context is the number of context lines |
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23 text treats all files as text |
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24 showfunc enables diff -p output |
2907 | 25 git enables the git extended patch format |
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26 nodates removes dates from diff headers |
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27 ignorews ignores all whitespace changes in the diff |
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28 ignorewsamount ignores changes in the amount of whitespace |
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29 ignoreblanklines ignores changes whose lines are all blank''' |
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30 |
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31 defaults = { |
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32 'context': 3, |
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33 'text': False, |
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34 'showfunc': False, |
2907 | 35 'git': False, |
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36 'nodates': False, |
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37 'ignorews': False, |
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38 'ignorewsamount': False, |
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39 'ignoreblanklines': False, |
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40 } |
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41 |
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42 __slots__ = defaults.keys() |
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43 |
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44 def __init__(self, **opts): |
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45 for k in self.__slots__: |
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46 v = opts.get(k) |
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47 if v is None: |
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48 v = self.defaults[k] |
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49 setattr(self, k, v) |
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50 |
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51 try: |
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52 self.context = int(self.context) |
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53 except ValueError: |
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54 raise util.Abort(_('diff context lines count must be ' |
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55 'an integer, not %r') % self.context) |
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56 |
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57 defaultopts = diffopts() |
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58 |
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59 def wsclean(opts, text): |
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60 if opts.ignorews: |
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61 text = re.sub('[ \t]+', '', text) |
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62 elif opts.ignorewsamount: |
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63 text = re.sub('[ \t]+', ' ', text) |
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64 text = re.sub('[ \t]+\n', '\n', text) |
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65 if opts.ignoreblanklines: |
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66 text = re.sub('\n+', '', text) |
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67 return text |
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68 |
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69 def diffline(revs, a, b, opts): |
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70 parts = ['diff'] |
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71 if opts.git: |
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72 parts.append('--git') |
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73 if revs and not opts.git: |
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74 parts.append(' '.join(["-r %s" % rev for rev in revs])) |
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75 if opts.git: |
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76 parts.append('a/%s' % a) |
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77 parts.append('b/%s' % b) |
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78 else: |
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79 parts.append(a) |
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80 return ' '.join(parts) + '\n' |
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81 |
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82 def unidiff(a, ad, b, bd, fn1, fn2, r=None, opts=defaultopts): |
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83 def datetag(date, addtab=True): |
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84 if not opts.git and not opts.nodates: |
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85 return '\t%s\n' % date |
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86 if addtab and ' ' in fn1: |
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87 return '\t\n' |
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88 return '\n' |
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89 |
35 | 90 if not a and not b: return "" |
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92 |
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93 if not opts.text and (util.binary(a) or util.binary(b)): |
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94 if a and b and len(a) == len(b) and a == b: |
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95 return "" |
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96 l = ['Binary file %s has changed\n' % fn1] |
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97 elif not a: |
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98 b = splitnewlines(b) |
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99 if a is None: |
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100 l1 = '--- /dev/null%s' % datetag(epoch, False) |
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101 else: |
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102 l1 = "--- %s%s" % ("a/" + fn1, datetag(ad)) |
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103 l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd)) |
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104 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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105 l = [l1, l2, l3] + ["+" + e for e in b] |
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106 elif not b: |
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107 a = splitnewlines(a) |
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108 l1 = "--- %s%s" % ("a/" + fn1, datetag(ad)) |
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109 if b is None: |
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110 l2 = '+++ /dev/null%s' % datetag(epoch, False) |
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111 else: |
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112 l2 = "+++ %s%s" % ("b/" + fn2, datetag(bd)) |
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113 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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114 l = [l1, l2, l3] + ["-" + e for e in a] |
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115 else: |
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116 al = splitnewlines(a) |
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117 bl = splitnewlines(b) |
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118 l = list(bunidiff(a, b, al, bl, "a/" + fn1, "b/" + fn2, opts=opts)) |
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119 if not l: return "" |
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120 # difflib uses a space, rather than a tab |
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121 l[0] = "%s%s" % (l[0][:-2], datetag(ad)) |
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122 l[1] = "%s%s" % (l[1][:-2], datetag(bd)) |
170 | 123 |
124 for ln in xrange(len(l)): | |
125 if l[ln][-1] != '\n': | |
126 l[ln] += "\n\ No newline at end of file\n" | |
127 | |
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128 if r: |
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129 l.insert(0, diffline(r, fn1, fn2, opts)) |
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130 |
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131 return "".join(l) |
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132 |
1637 | 133 # somewhat self contained replacement for difflib.unified_diff |
134 # t1 and t2 are the text to be diffed | |
135 # l1 and l2 are the text broken up into lines | |
136 # header1 and header2 are the filenames for the diff output | |
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137 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 138 def contextend(l, len): |
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139 ret = l + opts.context |
1637 | 140 if ret > len: |
141 ret = len | |
142 return ret | |
143 | |
144 def contextstart(l): | |
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145 ret = l - opts.context |
1637 | 146 if ret < 0: |
147 return 0 | |
148 return ret | |
149 | |
150 def yieldhunk(hunk, header): | |
151 if header: | |
152 for x in header: | |
153 yield x | |
154 (astart, a2, bstart, b2, delta) = hunk | |
155 aend = contextend(a2, len(l1)) | |
156 alen = aend - astart | |
157 blen = b2 - bstart + aend - a2 | |
158 | |
159 func = "" | |
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160 if opts.showfunc: |
1637 | 161 # walk backwards from the start of the context |
162 # to find a line starting with an alphanumeric char. | |
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163 for x in xrange(astart - 1, -1, -1): |
1637 | 164 t = l1[x].rstrip() |
165 if funcre.match(t): | |
166 func = ' ' + t[:40] | |
167 break | |
168 | |
169 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
170 bstart + 1, blen, func) | |
171 for x in delta: | |
172 yield x | |
173 for x in xrange(a2, aend): | |
174 yield ' ' + l1[x] | |
175 | |
176 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] | |
177 | |
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178 if opts.showfunc: |
1637 | 179 funcre = re.compile('\w') |
180 | |
181 # bdiff.blocks gives us the matching sequences in the files. The loop | |
182 # below finds the spaces between those matching sequences and translates | |
183 # them into diff output. | |
184 # | |
185 diff = bdiff.blocks(t1, t2) | |
186 hunk = None | |
187 for i in xrange(len(diff)): | |
188 # The first match is special. | |
189 # we've either found a match starting at line 0 or a match later | |
190 # in the file. If it starts later, old and new below will both be | |
191 # empty and we'll continue to the next match. | |
192 if i > 0: | |
193 s = diff[i-1] | |
194 else: | |
195 s = [0, 0, 0, 0] | |
196 delta = [] | |
197 s1 = diff[i] | |
198 a1 = s[1] | |
199 a2 = s1[0] | |
200 b1 = s[3] | |
201 b2 = s1[2] | |
202 | |
203 old = l1[a1:a2] | |
204 new = l2[b1:b2] | |
205 | |
206 # bdiff sometimes gives huge matches past eof, this check eats them, | |
207 # and deals with the special first match case described above | |
208 if not old and not new: | |
209 continue | |
210 | |
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211 if opts.ignorews or opts.ignorewsamount or opts.ignoreblanklines: |
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212 if wsclean(opts, "".join(old)) == wsclean(opts, "".join(new)): |
1637 | 213 continue |
214 | |
215 astart = contextstart(a1) | |
216 bstart = contextstart(b1) | |
217 prev = None | |
218 if hunk: | |
219 # join with the previous hunk if it falls inside the context | |
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220 if astart < hunk[1] + opts.context + 1: |
1637 | 221 prev = hunk |
222 astart = hunk[1] | |
223 bstart = hunk[3] | |
224 else: | |
225 for x in yieldhunk(hunk, header): | |
226 yield x | |
227 # we only want to yield the header if the files differ, and | |
228 # we only want to yield it once. | |
229 header = None | |
230 if prev: | |
231 # we've joined the previous hunk, record the new ending points. | |
232 hunk[1] = a2 | |
233 hunk[3] = b2 | |
234 delta = hunk[4] | |
235 else: | |
236 # create a new hunk | |
237 hunk = [ astart, a2, bstart, b2, delta ] | |
238 | |
239 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] | |
240 delta[len(delta):] = [ '-' + x for x in old ] | |
241 delta[len(delta):] = [ '+' + x for x in new ] | |
242 | |
243 if hunk: | |
244 for x in yieldhunk(hunk, header): | |
245 yield x | |
246 | |
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247 def patchtext(bin): |
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248 pos = 0 |
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249 t = [] |
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250 while pos < len(bin): |
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251 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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252 pos += 12 |
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253 t.append(bin[pos:pos + l]) |
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254 pos += l |
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255 return "".join(t) |
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256 |
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257 def patch(a, bin): |
1379 | 258 return mpatch.patches(a, [bin]) |
432 | 259 |
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260 # similar to difflib.SequenceMatcher.get_matching_blocks |
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261 def get_matching_blocks(a, b): |
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262 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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263 |
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264 def trivialdiffheader(length): |
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265 return struct.pack(">lll", 0, 0, length) |
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266 |
1379 | 267 patches = mpatch.patches |
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268 patchedsize = mpatch.patchedsize |
432 | 269 textdiff = bdiff.bdiff |