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annotate src/org/tmatesoft/hg/internal/PatchGenerator.java @ 543:1e95f48d9886

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 15 Feb 2013 15:52:03 +0100
parents a71a05ec11bc
children 7f5998a9619d
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 import org.tmatesoft.hg.repo.HgDataFile;
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24 import org.tmatesoft.hg.repo.HgLookup;
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25 import org.tmatesoft.hg.repo.HgRepository;
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26
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27 /**
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28 * 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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29 *
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30 * 522: 233748 0 103 17438 433 522 521 -1 756073cf2321df44d3ed0585f2a5754bc8a1b2f6
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31 * <PATCH>:
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32 * 3487..3578, 91:src/org/tmatesoft/hg/core/HgIterateDirection.java\00add61a8a665c5d8f092210767f812fe0d335ac8
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33 *
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34 * 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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35 * in the patch.
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36 *
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37 * Mercurial paper describes reasons for choosing this approach to delta generation, too.
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38 *
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class PatchGenerator {
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44
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45 private Map<ChunkSequence.ByteChain, IntVector> chunk2UseIndex;
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46 private ChunkSequence seq1, seq2;
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47
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48 // get filled by #longestMatch, track start of common sequence in seq1 and seq2, respectively
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49 private int matchStartS1, matchStartS2;
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50
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51 private MatchInspector matchInspector;
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52
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53 public void init(byte[] data1, byte[] data2) {
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54 seq1 = new ChunkSequence(data1);
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55 seq1.splitByNewlines();
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56 seq2 = new ChunkSequence(data2);
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57 seq2.splitByNewlines();
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58 prepare(seq2);
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59 }
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60
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61 private void prepare(ChunkSequence s2) {
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62 chunk2UseIndex = new HashMap<ChunkSequence.ByteChain, IntVector>();
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63 for (int i = 0, len = s2.chunkCount(); i < len; i++) {
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64 ChunkSequence.ByteChain bc = s2.chunk(i);
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65 IntVector loc = chunk2UseIndex.get(bc);
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66 if (loc == null) {
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67 chunk2UseIndex.put(bc, loc = new IntVector());
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68 }
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69 loc.add(i);
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70 // bc.registerUseIn(i) - BEWARE, use of bc here is incorrect
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71 // in this case need to find the only ByteChain to keep indexes
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72 // i.e. when there are few equal ByteChain instances, notion of "usedIn" shall be either shared (reference same vector)
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73 // or kept within only one of them
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74 }
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75 // for (ChunkSequence.ByteChain bc : chunk2UseIndex.keySet()) {
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76 // System.out.printf("%s: {", new String(bc.data()));
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77 // for (int x : chunk2UseIndex.get(bc).toArray()) {
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78 // System.out.printf(" %d,", x);
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79 // }
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80 // System.out.println("}");
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81 // }
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82 }
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83
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84 public void findMatchingBlocks(MatchInspector insp) {
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85 insp.begin(seq1, seq2);
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86 matchInspector = insp;
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87 findMatchingBlocks(0, seq1.chunkCount(), 0, seq2.chunkCount());
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88 insp.end();
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89 }
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90
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91 /**
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92 * implementation based on Python's difflib.py and SequenceMatcher
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93 */
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94 public int longestMatch(int startS1, int endS1, int startS2, int endS2) {
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95 matchStartS1 = matchStartS2 = 0;
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96 int maxLength = 0;
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97 IntMap<Integer> chunkIndex2MatchCount = new IntMap<Integer>(8);
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98 for (int i = startS1; i < endS1; i++) {
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99 ChunkSequence.ByteChain bc = seq1.chunk(i);
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100 IntMap<Integer> newChunkIndex2MatchCount = new IntMap<Integer>(8);
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101 IntVector occurencesInS2 = chunk2UseIndex.get(bc);
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102 if (occurencesInS2 == null) {
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103 // chunkIndex2MatchCount.clear(); // TODO need clear instead of new instance
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104 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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105 continue;
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106 }
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107 for (int j : occurencesInS2.toArray()) {
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108 // s1[i] == s2[j]
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109 if (j < startS2) {
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110 continue;
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111 }
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112 if (j >= endS2) {
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113 break;
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114 }
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115 int prevChunkMatches = chunkIndex2MatchCount.containsKey(j-1) ? chunkIndex2MatchCount.get(j-1) : 0;
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116 int k = prevChunkMatches + 1;
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117 newChunkIndex2MatchCount.put(j, k);
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118 if (k > maxLength) {
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119 matchStartS1 = i-k+1;
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120 matchStartS2 = j-k+1;
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121 maxLength = k;
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122 }
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123 }
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124 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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125 }
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126 return maxLength;
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127 }
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128
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129 private void findMatchingBlocks(int startS1, int endS1, int startS2, int endS2) {
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130 int matchLength = longestMatch(startS1, endS1, startS2, endS2);
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131 if (matchLength > 0) {
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132 final int saveStartS1 = matchStartS1, saveStartS2 = matchStartS2;
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133 if (startS1 < matchStartS1 && startS2 < matchStartS2) {
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134 findMatchingBlocks(startS1, matchStartS1, startS2, matchStartS2);
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135 }
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136 matchInspector.match(saveStartS1, saveStartS2, matchLength);
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137 if (saveStartS1+matchLength < endS1 && saveStartS2+matchLength < endS2) {
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138 findMatchingBlocks(saveStartS1 + matchLength, endS1, saveStartS2 + matchLength, endS2);
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139 }
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140 }
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141 }
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142
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143 interface MatchInspector {
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144 void begin(ChunkSequence s1, ChunkSequence s2);
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145 void match(int startSeq1, int startSeq2, int matchLength);
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146 void end();
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147 }
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148
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149 static class MatchDumpInspector implements MatchInspector {
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150 public void begin(ChunkSequence s1, ChunkSequence s2) {
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151 }
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152
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153 public void match(int startSeq1, int startSeq2, int matchLength) {
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154 System.out.printf("match: from line #%d and line #%d of length %d\n", startSeq1, startSeq2, matchLength);
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155 }
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156
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157 public void end() {
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158 }
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159 }
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160
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161 static class DeltaInspector implements MatchInspector {
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162 protected int changeStartS1, changeStartS2;
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163 protected ChunkSequence seq1, seq2;
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164
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165
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166 public void begin(ChunkSequence s1, ChunkSequence s2) {
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167 seq1 = s1;
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168 seq2 = s2;
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169 changeStartS1 = changeStartS2 = 0;
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170 }
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171
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172 public void match(int startSeq1, int startSeq2, int matchLength) {
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173 reportDeltaElement(startSeq1, startSeq2, matchLength);
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174 changeStartS1 = startSeq1 + matchLength;
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175 changeStartS2 = startSeq2 + matchLength;
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176 }
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177
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178 public void end() {
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179 if (changeStartS1 < seq1.chunkCount() || changeStartS2 < seq2.chunkCount()) {
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180 reportDeltaElement(seq1.chunkCount(), seq2.chunkCount(), 0);
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181 }
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182 }
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183
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184 protected void reportDeltaElement(int matchStartSeq1, int matchStartSeq2, int matchLength) {
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185 if (changeStartS1 < matchStartSeq1) {
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186 if (changeStartS2 < matchStartSeq2) {
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187 changed(changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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188 } else {
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189 assert changeStartS2 == matchStartSeq2;
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190 deleted(matchStartSeq2, changeStartS1, matchStartSeq1);
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191 }
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192 } else {
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193 assert changeStartS1 == matchStartSeq1;
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194 if(changeStartS2 < matchStartSeq2) {
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195 added(matchStartSeq1, changeStartS2, matchStartSeq2);
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196 } else {
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197 assert changeStartS2 == matchStartSeq2;
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198 System.out.printf("adjustent equal blocks %d, %d and %d,%d\n", changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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199 }
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200 }
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201 if (matchLength > 0) {
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202 unchanged(matchStartSeq1, matchStartSeq2, matchLength);
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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 * [s1From..s1To) replaced with [s2From..s2To)
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208 */
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209 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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210 // NO-OP
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211 }
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212
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213 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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214 // NO-OP
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215 }
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216
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217 protected void added(int s1InsertPoint, int s2From, int s2To) {
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218 // NO-OP
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219 }
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220
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221 protected void unchanged(int s1From, int s2From, int length) {
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222 // NO-OP
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223 }
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224 }
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225
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226 static class DeltaDumpInspector extends DeltaInspector {
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227
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228 @Override
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229 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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230 System.out.printf("changed [%d..%d) with [%d..%d)\n", s1From, s1To, s2From, s2To);
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231 }
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232
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233 @Override
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234 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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235 System.out.printf("deleted [%d..%d)\n", s1From, s1To);
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236 }
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237
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238 @Override
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239 protected void added(int s1InsertPoint, int s2From, int s2To) {
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240 System.out.printf("added [%d..%d) at %d\n", s2From, s2To, s1InsertPoint);
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241 }
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242
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243 }
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244
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245 static class PatchFillInspector extends DeltaInspector {
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246 private final Patch deltaCollector;
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247
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248 PatchFillInspector(Patch p) {
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249 assert p != null;
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250 deltaCollector = p;
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251 }
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252
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253 @Override
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254 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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255 int from = seq1.chunk(s1From).getOffset();
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256 int to = seq1.chunk(s1To).getOffset();
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257 byte[] data = seq2.data(s2From, s2To);
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258 deltaCollector.add(from, to, data);
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259 }
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260
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261 @Override
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262 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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263 int from = seq1.chunk(s1From).getOffset();
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264 int to = seq1.chunk(s1To).getOffset();
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265 deltaCollector.add(from, to, new byte[0]);
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266 }
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267
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268 @Override
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269 protected void added(int s1InsertPoint, int s2From, int s2To) {
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270 int insPoint = seq1.chunk(s1InsertPoint).getOffset();
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271 byte[] data = seq2.data(s2From, s2To);
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272 deltaCollector.add(insPoint, insPoint, data);
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273 }
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274 }
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275
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276
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277
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278 public static void main(String[] args) throws Exception {
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279 PatchGenerator pg1 = new PatchGenerator();
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280 pg1.init("hello".getBytes(), "hello\nworld".getBytes());
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281 pg1.findMatchingBlocks(new MatchDumpInspector());
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282 pg1.findMatchingBlocks(new DeltaDumpInspector());
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283 if (Boolean.FALSE.booleanValue()) {
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284 return;
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285 }
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286 HgRepository repo = new HgLookup().detectFromWorkingDir();
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287 HgDataFile df = repo.getFileNode("cmdline/org/tmatesoft/hg/console/Main.java");
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288 ByteArrayChannel bac1, bac2;
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289 df.content(80, bac1 = new ByteArrayChannel());
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290 df.content(81, bac2 = new ByteArrayChannel());
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291 // String s1 = "line 1\nline 2\r\nline 3\n\nline 1\nline 2";
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292 // String s2 = "abc\ncdef\r\nline 2\r\nline 3\nline 2";
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293 PatchGenerator pg = new PatchGenerator();
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294 pg.init(bac1.toArray(), bac2.toArray());
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295 System.out.println("Matches:");
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296 pg.findMatchingBlocks(new MatchDumpInspector());
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297 System.out.println("Deltas:");
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298 pg.findMatchingBlocks(new DeltaDumpInspector());
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299 }
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300
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301 public Patch delta(byte[] prev, byte[] content) {
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302 Patch rv = new Patch();
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303 init(prev, content);
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304 findMatchingBlocks(new PatchFillInspector(rv));
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305 return rv;
533
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306 }
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307
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308 /*
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309 * TODO shall be parameterized (template?) and refacctored to facilitate matching non lines only
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310 * (sequence diff algorithm above doesn't care about sequence nature)
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311 */
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312 static final class ChunkSequence {
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313
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314 private final byte[] input;
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315 private ArrayList<ByteChain> lines;
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316
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317 public ChunkSequence(byte[] data) {
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318 input = data;
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319 }
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320
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321 public void splitByNewlines() {
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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, input.length));
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341 }
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342
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343 public ByteChain chunk(int index) {
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344 return lines.get(index);
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345 }
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346
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347 public int chunkCount() {
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348 return lines.size();
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349 }
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350
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351 public byte[] data(int chunkFrom, int chunkTo) {
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352 if (chunkFrom == chunkTo) {
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353 return new byte[0];
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354 }
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355 int from = chunk(chunkFrom).getOffset(), to = chunk(chunkTo).getOffset();
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356 byte[] rv = new byte[to - from];
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357 System.arraycopy(input, from, rv, 0, rv.length);
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358 return rv;
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359 }
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360
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361
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362 final class ByteChain {
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363 private final int start, end;
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364 private final int hash;
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365
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366 ByteChain(int s, int e) {
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367 start = s;
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368 end = e;
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369 hash = calcHash(input, s, e);
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370 }
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371
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372 /**
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373 * byte offset of the this ByteChain inside ChainSequence
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374 */
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375 public int getOffset() {
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376 return start;
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377 }
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378
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379 public byte[] data() {
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380 byte[] rv = new byte[end - start];
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381 System.arraycopy(input, start, rv, 0, rv.length);
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382 return rv;
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383 }
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384
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385 @Override
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386 public boolean equals(Object obj) {
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387 if (obj == null || obj.getClass() != ByteChain.class) {
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388 return false;
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389 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
390 ByteChain other = (ByteChain) obj;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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391 if (other.hash != hash || other.end - other.start != end - start) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
392 return false;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
393 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
394 return other.match(input, start);
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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395 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
396
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
397 private boolean match(byte[] oi, int from) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
398 for (int i = start, j = from; i < end; i++, j++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
399 if (ChunkSequence.this.input[i] != oi[j]) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
400 return false;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
401 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
402 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
403 return true;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
404 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
405
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
406 @Override
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
407 public int hashCode() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
408 return hash;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
409 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
410
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
411 @Override
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
412 public String toString() {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
413 return String.format("[@%d\"%s\"]", start, new String(data()));
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
414 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
415 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
416
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
417 // 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
418 static int calcHash(byte[] data, int from, int to) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
419 int result = 1;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
420 for (int i = from; i < to; i++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
421 result = 31 * result + data[i];
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
422 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
423 return result;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
424 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
425 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
426 }