Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mdiff.py @ 4520:ce1fed4a5b94
Fix hgext/convert/__init__.py rights
author | Edouard Gomez <ed.gomez@free.fr> |
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date | Thu, 07 Jun 2007 23:06:17 +0200 |
parents | 99c853a1408c |
children | 826659bd8053 |
rev | line source |
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1 # mdiff.py - diff and patch routines for mercurial |
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2 # |
2858 | 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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
4107 | 8 import bdiff, mpatch, re, struct, util, md5 |
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9 |
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10 def splitnewlines(text): |
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11 '''like str.splitlines, but only split on newlines.''' |
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12 lines = [l + '\n' for l in text.split('\n')] |
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13 if lines: |
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14 if lines[-1] == '\n': |
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15 lines.pop() |
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16 else: |
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17 lines[-1] = lines[-1][:-1] |
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18 return lines |
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19 |
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20 class diffopts(object): |
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21 '''context is the number of context lines |
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22 text treats all files as text |
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23 showfunc enables diff -p output |
2892 | 24 git enables the git extended patch format |
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25 nodates removes dates from diff headers |
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26 ignorews ignores all whitespace changes in the diff |
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27 ignorewsamount ignores changes in the amount of whitespace |
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28 ignoreblanklines ignores changes whose lines are all blank''' |
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29 |
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30 defaults = { |
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31 'context': 3, |
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32 'text': False, |
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33 'showfunc': True, |
2892 | 34 'git': False, |
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35 'nodates': False, |
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36 'ignorews': False, |
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37 'ignorewsamount': False, |
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38 'ignoreblanklines': False, |
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39 } |
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40 |
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41 __slots__ = defaults.keys() |
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42 |
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43 def __init__(self, **opts): |
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44 for k in self.__slots__: |
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45 v = opts.get(k) |
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46 if v is None: |
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47 v = self.defaults[k] |
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48 setattr(self, k, v) |
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49 |
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50 defaultopts = diffopts() |
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51 |
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52 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts): |
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53 def datetag(date): |
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54 return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date |
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55 |
35 | 56 if not a and not b: return "" |
1379 | 57 epoch = util.datestr((0, 0)) |
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58 |
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59 if not opts.text and (util.binary(a) or util.binary(b)): |
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60 def h(v): |
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61 # md5 is used instead of sha1 because md5 is supposedly faster |
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62 return md5.new(v).digest() |
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63 if a and b and len(a) == len(b) and h(a) == h(b): |
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64 return "" |
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65 l = ['Binary file %s has changed\n' % fn] |
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66 elif not a: |
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67 b = splitnewlines(b) |
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68 if a is None: |
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69 l1 = '--- /dev/null%s' % datetag(epoch) |
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70 else: |
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71 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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72 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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73 l3 = "@@ -0,0 +1,%d @@\n" % len(b) |
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74 l = [l1, l2, l3] + ["+" + e for e in b] |
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75 elif not b: |
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76 a = splitnewlines(a) |
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77 l1 = "--- %s%s" % ("a/" + fn, datetag(ad)) |
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78 if b is None: |
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79 l2 = '+++ /dev/null%s' % datetag(epoch) |
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80 else: |
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81 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd)) |
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82 l3 = "@@ -1,%d +0,0 @@\n" % len(a) |
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83 l = [l1, l2, l3] + ["-" + e for e in a] |
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84 else: |
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85 al = splitnewlines(a) |
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86 bl = splitnewlines(b) |
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87 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts)) |
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88 if not l: return "" |
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89 # difflib uses a space, rather than a tab |
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90 l[0] = "%s%s" % (l[0][:-2], datetag(ad)) |
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91 l[1] = "%s%s" % (l[1][:-2], datetag(bd)) |
170 | 92 |
93 for ln in xrange(len(l)): | |
94 if l[ln][-1] != '\n': | |
95 l[ln] += "\n\ No newline at end of file\n" | |
96 | |
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97 if r: |
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98 l.insert(0, "diff %s %s\n" % |
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99 (' '.join(["-r %s" % rev for rev in r]), fn)) |
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100 |
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101 return "".join(l) |
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102 |
1637 | 103 # somewhat self contained replacement for difflib.unified_diff |
104 # t1 and t2 are the text to be diffed | |
105 # l1 and l2 are the text broken up into lines | |
106 # header1 and header2 are the filenames for the diff output | |
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107 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts): |
1637 | 108 def contextend(l, len): |
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109 ret = l + opts.context |
1637 | 110 if ret > len: |
111 ret = len | |
112 return ret | |
113 | |
114 def contextstart(l): | |
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115 ret = l - opts.context |
1637 | 116 if ret < 0: |
117 return 0 | |
118 return ret | |
119 | |
120 def yieldhunk(hunk, header): | |
121 if header: | |
122 for x in header: | |
123 yield x | |
124 (astart, a2, bstart, b2, delta) = hunk | |
125 aend = contextend(a2, len(l1)) | |
126 alen = aend - astart | |
127 blen = b2 - bstart + aend - a2 | |
128 | |
129 func = "" | |
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130 if opts.showfunc: |
1637 | 131 # walk backwards from the start of the context |
132 # to find a line starting with an alphanumeric char. | |
133 for x in xrange(astart, -1, -1): | |
134 t = l1[x].rstrip() | |
135 if funcre.match(t): | |
136 func = ' ' + t[:40] | |
137 break | |
138 | |
139 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen, | |
140 bstart + 1, blen, func) | |
141 for x in delta: | |
142 yield x | |
143 for x in xrange(a2, aend): | |
144 yield ' ' + l1[x] | |
145 | |
146 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ] | |
147 | |
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148 if opts.showfunc: |
1637 | 149 funcre = re.compile('\w') |
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150 if opts.ignorewsamount: |
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151 wsamountre = re.compile('[ \t]+') |
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152 wsappendedre = re.compile(' \n') |
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153 if opts.ignoreblanklines: |
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154 wsblanklinesre = re.compile('\n') |
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155 if opts.ignorews: |
1637 | 156 wsre = re.compile('[ \t]') |
157 | |
158 # bdiff.blocks gives us the matching sequences in the files. The loop | |
159 # below finds the spaces between those matching sequences and translates | |
160 # them into diff output. | |
161 # | |
162 diff = bdiff.blocks(t1, t2) | |
163 hunk = None | |
164 for i in xrange(len(diff)): | |
165 # The first match is special. | |
166 # we've either found a match starting at line 0 or a match later | |
167 # in the file. If it starts later, old and new below will both be | |
168 # empty and we'll continue to the next match. | |
169 if i > 0: | |
170 s = diff[i-1] | |
171 else: | |
172 s = [0, 0, 0, 0] | |
173 delta = [] | |
174 s1 = diff[i] | |
175 a1 = s[1] | |
176 a2 = s1[0] | |
177 b1 = s[3] | |
178 b2 = s1[2] | |
179 | |
180 old = l1[a1:a2] | |
181 new = l2[b1:b2] | |
182 | |
183 # bdiff sometimes gives huge matches past eof, this check eats them, | |
184 # and deals with the special first match case described above | |
185 if not old and not new: | |
186 continue | |
187 | |
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188 if opts.ignoreblanklines: |
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189 wsold = wsblanklinesre.sub('', "".join(old)) |
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190 wsnew = wsblanklinesre.sub('', "".join(new)) |
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191 if wsold == wsnew: |
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192 continue |
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193 |
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194 if opts.ignorewsamount: |
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195 wsold = wsamountre.sub(' ', "".join(old)) |
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196 wsold = wsappendedre.sub('\n', wsold) |
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197 wsnew = wsamountre.sub(' ', "".join(new)) |
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198 wsnew = wsappendedre.sub('\n', wsnew) |
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199 if wsold == wsnew: |
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200 continue |
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201 |
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202 if opts.ignorews: |
1637 | 203 wsold = wsre.sub('', "".join(old)) |
204 wsnew = wsre.sub('', "".join(new)) | |
205 if wsold == wsnew: | |
206 continue | |
207 | |
208 astart = contextstart(a1) | |
209 bstart = contextstart(b1) | |
210 prev = None | |
211 if hunk: | |
212 # join with the previous hunk if it falls inside the context | |
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213 if astart < hunk[1] + opts.context + 1: |
1637 | 214 prev = hunk |
215 astart = hunk[1] | |
216 bstart = hunk[3] | |
217 else: | |
218 for x in yieldhunk(hunk, header): | |
219 yield x | |
220 # we only want to yield the header if the files differ, and | |
221 # we only want to yield it once. | |
222 header = None | |
223 if prev: | |
224 # we've joined the previous hunk, record the new ending points. | |
225 hunk[1] = a2 | |
226 hunk[3] = b2 | |
227 delta = hunk[4] | |
228 else: | |
229 # create a new hunk | |
230 hunk = [ astart, a2, bstart, b2, delta ] | |
231 | |
232 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ] | |
233 delta[len(delta):] = [ '-' + x for x in old ] | |
234 delta[len(delta):] = [ '+' + x for x in new ] | |
235 | |
236 if hunk: | |
237 for x in yieldhunk(hunk, header): | |
238 yield x | |
239 | |
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240 def patchtext(bin): |
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241 pos = 0 |
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242 t = [] |
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243 while pos < len(bin): |
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244 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) |
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245 pos += 12 |
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246 t.append(bin[pos:pos + l]) |
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247 pos += l |
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248 return "".join(t) |
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249 |
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250 def patch(a, bin): |
1379 | 251 return mpatch.patches(a, [bin]) |
432 | 252 |
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253 # similar to difflib.SequenceMatcher.get_matching_blocks |
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254 def get_matching_blocks(a, b): |
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255 return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)] |
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256 |
1379 | 257 patches = mpatch.patches |
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258 patchedsize = mpatch.patchedsize |
432 | 259 textdiff = bdiff.bdiff |