Mercurial > hg
annotate mercurial/similar.py @ 42437:9609430d3625
rust-filepatterns: use bytes instead of String
In my initial patch, I introduced an unnecessary hard constraint on UTF-8
filenames and patterns which I forgot to remove. Although the performance
penalty for using String might be negligible, we don't want to break
compatibility with non-UTF-8 encodings for no reason.
Moreover, this change allows for a cleaner Rust core API.
This patch introduces a new utils module that is used with this fix.
Finally, PatternError was not put inside the Python module generated by
Rust, which would have raised a NameError.
Differential Revision: https://phab.mercurial-scm.org/D6485
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Thu, 06 Jun 2019 15:30:56 +0200 |
parents | 59c9d3cc810f |
children | 2372284d9457 |
rev | line source |
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1 # similar.py - mechanisms for finding similar files |
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2 # |
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3 # Copyright 2005-2007 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 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 from .i18n import _ |
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11 from . import ( |
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12 mdiff, |
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13 ) |
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14 |
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15 def _findexactmatches(repo, added, removed): |
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16 '''find renamed files that have no changes |
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17 |
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18 Takes a list of new filectxs and a list of removed filectxs, and yields |
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19 (before, after) tuples of exact matches. |
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20 ''' |
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21 # Build table of removed files: {hash(fctx.data()): [fctx, ...]}. |
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22 # We use hash() to discard fctx.data() from memory. |
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23 hashes = {} |
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24 progress = repo.ui.makeprogress(_('searching for exact renames'), |
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25 total=(len(added) + len(removed)), |
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26 unit=_('files')) |
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27 for fctx in removed: |
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28 progress.increment() |
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29 h = hash(fctx.data()) |
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30 if h not in hashes: |
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31 hashes[h] = [fctx] |
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32 else: |
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33 hashes[h].append(fctx) |
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34 |
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35 # For each added file, see if it corresponds to a removed file. |
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36 for fctx in added: |
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37 progress.increment() |
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38 adata = fctx.data() |
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39 h = hash(adata) |
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40 for rfctx in hashes.get(h, []): |
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41 # compare between actual file contents for exact identity |
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42 if adata == rfctx.data(): |
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43 yield (rfctx, fctx) |
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44 break |
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45 |
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46 # Done |
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47 progress.complete() |
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48 |
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49 def _ctxdata(fctx): |
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50 # lazily load text |
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51 orig = fctx.data() |
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52 return orig, mdiff.splitnewlines(orig) |
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53 |
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54 def _score(fctx, otherdata): |
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55 orig, lines = otherdata |
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56 text = fctx.data() |
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57 # mdiff.blocks() returns blocks of matching lines |
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58 # count the number of bytes in each |
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59 equal = 0 |
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60 matches = mdiff.blocks(text, orig) |
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61 for x1, x2, y1, y2 in matches: |
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62 for line in lines[y1:y2]: |
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63 equal += len(line) |
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64 |
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65 lengths = len(text) + len(orig) |
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66 return equal * 2.0 / lengths |
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67 |
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68 def score(fctx1, fctx2): |
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69 return _score(fctx1, _ctxdata(fctx2)) |
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70 |
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71 def _findsimilarmatches(repo, added, removed, threshold): |
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72 '''find potentially renamed files based on similar file content |
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73 |
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74 Takes a list of new filectxs and a list of removed filectxs, and yields |
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75 (before, after, score) tuples of partial matches. |
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76 ''' |
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77 copies = {} |
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78 progress = repo.ui.makeprogress(_('searching for similar files'), |
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79 unit=_('files'), total=len(removed)) |
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80 for r in removed: |
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81 progress.increment() |
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82 data = None |
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83 for a in added: |
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84 bestscore = copies.get(a, (None, threshold))[1] |
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85 if data is None: |
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86 data = _ctxdata(r) |
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87 myscore = _score(a, data) |
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88 if myscore > bestscore: |
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89 copies[a] = (r, myscore) |
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90 progress.complete() |
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91 |
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92 for dest, v in copies.iteritems(): |
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93 source, bscore = v |
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94 yield source, dest, bscore |
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95 |
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96 def _dropempty(fctxs): |
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97 return [x for x in fctxs if x.size() > 0] |
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98 |
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99 def findrenames(repo, added, removed, threshold): |
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100 '''find renamed files -- yields (before, after, score) tuples''' |
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101 wctx = repo[None] |
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102 pctx = wctx.p1() |
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103 |
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104 # Zero length files will be frequently unrelated to each other, and |
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105 # tracking the deletion/addition of such a file will probably cause more |
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106 # harm than good. We strip them out here to avoid matching them later on. |
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107 addedfiles = _dropempty(wctx[fp] for fp in sorted(added)) |
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108 removedfiles = _dropempty(pctx[fp] for fp in sorted(removed) if fp in pctx) |
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109 |
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110 # Find exact matches. |
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111 matchedfiles = set() |
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112 for (a, b) in _findexactmatches(repo, addedfiles, removedfiles): |
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113 matchedfiles.add(b) |
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114 yield (a.path(), b.path(), 1.0) |
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115 |
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116 # If the user requested similar files to be matched, search for them also. |
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117 if threshold < 1.0: |
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118 addedfiles = [x for x in addedfiles if x not in matchedfiles] |
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119 for (a, b, score) in _findsimilarmatches(repo, addedfiles, |
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120 removedfiles, threshold): |
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121 yield (a.path(), b.path(), score) |