Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DiffHelper.java @ 694:7efabe0cddcf

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 05 Aug 2013 17:42:10 +0200
parents 58a6900f845d
children
rev   line source
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.util.ArrayList;
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20 import java.util.HashMap;
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21 import java.util.Map;
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22
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23 /**
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24 * Mercurial cares about changes only up to the line level, e.g. a simple file version dump in manifest looks like (RevlogDump output):
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25 *
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26 * 522: 233748 0 103 17438 433 522 521 -1 756073cf2321df44d3ed0585f2a5754bc8a1b2f6
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27 * <PATCH>:
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28 * 3487..3578, 91:src/org/tmatesoft/hg/core/HgIterateDirection.java\00add61a8a665c5d8f092210767f812fe0d335ac8
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29 *
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30 * I.e. for the {fname}{revision} entry format of manifest, not only {revision} is changed, but the whole line, with unchanged {fname} is recorded
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31 * in the patch.
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32 *
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33 * Mercurial paper describes reasons for choosing this approach to delta generation, too.
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34 *
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class DiffHelper<T extends DiffHelper.ChunkSequence<?>> {
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40
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41 private Map<Object, IntVector> chunk2UseIndex;
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42 private T seq1, seq2;
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43
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44 // get filled by #longestMatch, track start of common sequence in seq1 and seq2, respectively
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45 private int matchStartS1, matchStartS2;
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46
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47 private MatchInspector<T> matchInspector;
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48
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49 public void init(T s1, T s2) {
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50 seq1 = s1;
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51 seq2 = s2;
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52 prepare(s2);
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53 }
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55 public void init(T s1) {
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56 if (seq2 == null) {
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57 throw new IllegalStateException("Use this #init() only when target sequence shall be matched against different origin");
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58 }
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59 seq1 = s1;
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60 }
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61
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62
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63 private void prepare(T s2) {
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64 chunk2UseIndex = new HashMap<Object, IntVector>();
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65 for (int i = 0, len = s2.chunkCount(); i < len; i++) {
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66 Object bc = s2.chunk(i);
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67 IntVector loc = chunk2UseIndex.get(bc);
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68 if (loc == null) {
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69 chunk2UseIndex.put(bc, loc = new IntVector());
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70 }
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71 loc.add(i);
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72 // bc.registerUseIn(i) - BEWARE, use of bc here is incorrect
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73 // in this case need to find the only ByteChain to keep indexes
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74 // i.e. when there are few equal ByteChain instances, notion of "usedIn" shall be either shared (reference same vector)
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75 // or kept within only one of them
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76 }
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77 }
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78
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79 public void findMatchingBlocks(MatchInspector<T> insp) {
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80 insp.begin(seq1, seq2);
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81 matchInspector = insp;
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82 findMatchingBlocks(0, seq1.chunkCount(), 0, seq2.chunkCount());
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83 insp.end();
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84 }
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85
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86 /**
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87 * look up every line in s2 that match lines in s1
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88 * idea: pure additions in s2 are diff-ed against s1 again and again, to see if there are any matches
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89 */
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90 void findAllMatchAlternatives(final MatchInspector<T> insp) {
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91 assert seq1.chunkCount() > 0;
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92 final IntSliceSeq insertions = new IntSliceSeq(2);
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93 final boolean matchedAny[] = new boolean[] {false};
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94 DeltaInspector<T> myInsp = new DeltaInspector<T>() {
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95 @Override
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96 protected void unchanged(int s1From, int s2From, int length) {
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97 matchedAny[0] = true;
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98 insp.match(s1From, s2From, length);
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99 }
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100 @Override
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101 protected void added(int s1InsertPoint, int s2From, int s2To) {
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102 insertions.add(s2From, s2To);
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103 }
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104 };
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105 matchInspector = myInsp;
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106 myInsp.begin(seq1, seq2);
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107 IntSliceSeq s2RangesToCheck = new IntSliceSeq(2, 1, 0);
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108 s2RangesToCheck.add(0, seq2.chunkCount());
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109 do {
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110 IntSliceSeq nextCheck = new IntSliceSeq(2);
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111 for (IntTuple t : s2RangesToCheck) {
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112 int s2Start = t.at(0);
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113 int s2End = t.at(1);
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114 myInsp.changeStartS1 = 0;
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115 myInsp.changeStartS2 = s2Start;
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116 insp.begin(seq1, seq2);
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117 matchedAny[0] = false;
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118 findMatchingBlocks(0, seq1.chunkCount(), s2Start, s2End);
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119 insp.end();
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120 myInsp.end();
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121 if (matchedAny[0]) {
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122 nextCheck.addAll(insertions);
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123 }
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124 insertions.clear();
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125 }
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126 s2RangesToCheck = nextCheck;
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127 } while (s2RangesToCheck.size() > 0);
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128 }
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129
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130 /**
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131 * implementation based on Python's difflib.py and SequenceMatcher
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132 */
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133 public int longestMatch(int startS1, int endS1, int startS2, int endS2) {
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134 matchStartS1 = matchStartS2 = 0;
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135 int maxLength = 0;
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136 IntMap<Integer> chunkIndex2MatchCount = new IntMap<Integer>(8);
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137 for (int i = startS1; i < endS1; i++) {
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138 Object bc = seq1.chunk(i);
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139 IntVector occurencesInS2 = chunk2UseIndex.get(bc);
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140 if (occurencesInS2 == null) {
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141 chunkIndex2MatchCount.clear();
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142 continue;
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143 }
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144 IntMap<Integer> newChunkIndex2MatchCount = new IntMap<Integer>(8);
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145 for (int j : occurencesInS2.toArray()) {
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146 // s1[i] == s2[j]
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147 if (j < startS2) {
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148 continue;
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149 }
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150 if (j >= endS2) {
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151 break;
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152 }
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153 int prevChunkMatches = chunkIndex2MatchCount.containsKey(j-1) ? chunkIndex2MatchCount.get(j-1) : 0;
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154 int k = prevChunkMatches + 1;
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155 newChunkIndex2MatchCount.put(j, k);
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156 if (k > maxLength) {
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157 matchStartS1 = i-k+1;
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158 matchStartS2 = j-k+1;
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159 maxLength = k;
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160 }
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161 }
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162 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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163 }
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164 return maxLength;
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165 }
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166
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167 private void findMatchingBlocks(int startS1, int endS1, int startS2, int endS2) {
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168 int matchLength = longestMatch(startS1, endS1, startS2, endS2);
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169 if (matchLength > 0) {
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170 final int saveStartS1 = matchStartS1, saveStartS2 = matchStartS2;
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171 if (startS1 < matchStartS1 && startS2 < matchStartS2) {
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172 findMatchingBlocks(startS1, matchStartS1, startS2, matchStartS2);
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173 }
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174 matchInspector.match(saveStartS1, saveStartS2, matchLength);
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175 if (saveStartS1+matchLength < endS1 && saveStartS2+matchLength < endS2) {
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176 findMatchingBlocks(saveStartS1 + matchLength, endS1, saveStartS2 + matchLength, endS2);
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177 }
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178 }
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179 }
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180
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181 public interface MatchInspector<T extends ChunkSequence<?>> {
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182 void begin(T s1, T s2);
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183 void match(int startSeq1, int startSeq2, int matchLength);
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184 void end();
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185 }
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186
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187 static class MatchDumpInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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188 private int matchCount;
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189
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190 public void begin(T s1, T s2) {
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191 matchCount = 0;
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192 }
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193
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194 public void match(int startSeq1, int startSeq2, int matchLength) {
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195 matchCount++;
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196 System.out.printf("match #%d: from line #%d and line #%d of length %d\n", matchCount, startSeq1, startSeq2, matchLength);
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197 }
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198
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199 public void end() {
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200 if (matchCount == 0) {
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201 System.out.println("NO MATCHES FOUND!");
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202 }
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203 }
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204 }
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205
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206 /**
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207 * Matcher implementation that translates "match/equal" notification to a delta-style "added/removed/changed".
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208 */
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209 public static class DeltaInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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210 protected int changeStartS1, changeStartS2;
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211 protected T seq1, seq2;
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212
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213 public void begin(T s1, T s2) {
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214 seq1 = s1;
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215 seq2 = s2;
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216 changeStartS1 = changeStartS2 = 0;
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217 }
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218
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219 public void match(int startSeq1, int startSeq2, int matchLength) {
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220 reportDeltaElement(startSeq1, startSeq2, matchLength);
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221 changeStartS1 = startSeq1 + matchLength;
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222 changeStartS2 = startSeq2 + matchLength;
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223 }
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224
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225 public void end() {
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226 if (changeStartS1 < seq1.chunkCount()-1 || changeStartS2 < seq2.chunkCount()-1) {
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227 reportDeltaElement(seq1.chunkCount()-1, seq2.chunkCount()-1, 0);
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228 }
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229 }
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230
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231 protected void reportDeltaElement(int matchStartSeq1, int matchStartSeq2, int matchLength) {
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232 if (changeStartS1 < matchStartSeq1) {
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233 if (changeStartS2 < matchStartSeq2) {
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234 changed(changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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235 } else {
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236 assert changeStartS2 == matchStartSeq2;
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237 deleted(matchStartSeq2, changeStartS1, matchStartSeq1);
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238 }
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239 } else {
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240 assert changeStartS1 == matchStartSeq1;
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241 if(changeStartS2 < matchStartSeq2) {
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242 added(changeStartS1, changeStartS2, matchStartSeq2);
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243 } else {
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244 assert changeStartS2 == matchStartSeq2;
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245 if (matchStartSeq1 > 0 || matchStartSeq2 > 0) {
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246 assert false : String.format("adjustent equal blocks %d, %d and %d,%d", changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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247 }
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248 }
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249 }
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250 if (matchLength > 0) {
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251 unchanged(matchStartSeq1, matchStartSeq2, matchLength);
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252 }
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253 }
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254
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255 /**
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256 * [s1From..s1To) replaced with [s2From..s2To)
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257 */
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258 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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259 // NO-OP
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260 }
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261
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262 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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263 // NO-OP
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264 }
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265
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266 protected void added(int s1InsertPoint, int s2From, int s2To) {
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267 // NO-OP
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268 }
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269
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270 protected void unchanged(int s1From, int s2From, int length) {
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271 // NO-OP
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272 }
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273 }
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274
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275 public static class DeltaDumpInspector<T extends ChunkSequence<?>> extends DeltaInspector<T> {
542
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276
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277 @Override
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278 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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279 System.out.printf("changed [%d..%d) with [%d..%d)\n", s1From, s1To, s2From, s2To);
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280 }
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281
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282 @Override
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283 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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284 System.out.printf("deleted [%d..%d)\n", s1From, s1To);
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285 }
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286
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287 @Override
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288 protected void added(int s1InsertPoint, int s2From, int s2To) {
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289 System.out.printf("added [%d..%d) at %d\n", s2From, s2To, s1InsertPoint);
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290 }
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291
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292 @Override
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293 protected void unchanged(int s1From, int s2From, int length) {
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294 System.out.printf("same [%d..%d) and [%d..%d)\n", s1From, s1From + length, s2From, s2From + length);
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295 }
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296 }
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297
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298 /**
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299 * Generic sequence of chunk, where chunk is anything comparable to another chunk, e.g. a string or a single char
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300 * Sequence diff algorithm above doesn't care about sequence nature.
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301 */
551
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302 public interface ChunkSequence<T> {
544
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303 public T chunk(int index);
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304 public int chunkCount();
533
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305 }
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306
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307 public static final class LineSequence implements ChunkSequence<LineSequence.ByteChain> {
533
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308
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309 private final byte[] input;
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310 private ArrayList<ByteChain> lines;
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311
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312 public LineSequence(byte[] data) {
533
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313 input = data;
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314 }
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315
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316 public static LineSequence newlines(byte[] array) {
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317 return new LineSequence(array).splitByNewlines();
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318 }
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319
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320 // sequence ends with fake, empty line chunk
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321 public LineSequence splitByNewlines() {
533
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322 lines = new ArrayList<ByteChain>();
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323 int lastStart = 0;
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324 for (int i = 0; i < input.length; i++) {
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325 if (input[i] == '\n') {
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326 lines.add(new ByteChain(lastStart, i+1));
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327 lastStart = i+1;
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328 } else if (input[i] == '\r') {
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329 if (i+1 < input.length && input[i+1] == '\n') {
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330 i++;
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331 }
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332 lines.add(new ByteChain(lastStart, i+1));
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333 lastStart = i+1;
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334 }
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335 }
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336 if (lastStart < input.length) {
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337 lines.add(new ByteChain(lastStart, input.length));
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338 }
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339 // empty chunk to keep offset of input end
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340 lines.add(new ByteChain(input.length));
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341 return this;
533
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342 }
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343
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344 public ByteChain chunk(int index) {
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345 return lines.get(index);
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346 }
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347
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348 public int chunkCount() {
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349 return lines.size();
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350 }
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351
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352 public byte[] data(int chunkFrom, int chunkTo) {
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353 if (chunkFrom == chunkTo) {
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354 return new byte[0];
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355 }
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356 int from = chunk(chunkFrom).getOffset(), to = chunk(chunkTo).getOffset();
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357 byte[] rv = new byte[to - from];
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358 System.arraycopy(input, from, rv, 0, rv.length);
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359 return rv;
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360 }
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361
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362
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363 public final class ByteChain {
533
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364 private final int start, end;
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365 private final int hash;
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366
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367 /**
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368 * construct a chunk with a sole purpose to keep
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369 * offset of the data end
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370 */
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371 ByteChain(int offset) {
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372 start = end = offset;
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373 // ensure this chunk doesn't match trailing chunk of another sequence
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374 hash = System.identityHashCode(this);
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375 }
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376
533
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377 ByteChain(int s, int e) {
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378 start = s;
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379 end = e;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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380 hash = calcHash(input, s, e);
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381 }
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382
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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383 /**
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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384 * byte offset of the this ByteChain inside ChainSequence
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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385 */
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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386 public int getOffset() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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387 return start;
e6f72c9829a6 Generate patches using diff algorithm
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388 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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389
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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390 public byte[] data() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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391 byte[] rv = new byte[end - start];
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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392 System.arraycopy(input, start, rv, 0, rv.length);
e6f72c9829a6 Generate patches using diff algorithm
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393 return rv;
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394 }
e6f72c9829a6 Generate patches using diff algorithm
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395
e6f72c9829a6 Generate patches using diff algorithm
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396 @Override
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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397 public boolean equals(Object obj) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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398 if (obj == null || obj.getClass() != ByteChain.class) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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399 return false;
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400 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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401 ByteChain other = (ByteChain) obj;
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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402 if (other.hash != hash || other.end - other.start != end - start) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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403 return false;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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404 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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405 return other.match(input, start);
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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406 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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407
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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408 private boolean match(byte[] oi, int from) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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409 for (int i = start, j = from; i < end; i++, j++) {
544
7f5998a9619d Refactor PatchGenerator to be generic and welcome sequence of any nature
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parents: 543
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410 if (LineSequence.this.input[i] != oi[j]) {
533
e6f72c9829a6 Generate patches using diff algorithm
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411 return false;
e6f72c9829a6 Generate patches using diff algorithm
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412 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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413 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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414 return true;
e6f72c9829a6 Generate patches using diff algorithm
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parents:
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415 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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416
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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417 @Override
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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418 public int hashCode() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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419 return hash;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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420 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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421
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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422 @Override
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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423 public String toString() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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424 return String.format("[@%d\"%s\"]", start, new String(data()));
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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425 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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426 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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427
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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428 // same as Arrays.hashCode(byte[]), just for a slice of a bigger array
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
429 static int calcHash(byte[] data, int from, int to) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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430 int result = 1;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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431 for (int i = from; i < to; i++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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432 result = 31 * result + data[i];
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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433 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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434 return result;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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435 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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436 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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437 }