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annotate src/org/tmatesoft/hg/internal/PatchGenerator.java @ 544:7f5998a9619d

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Refactor PatchGenerator to be generic and welcome sequence of any nature
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 15 Feb 2013 16:48:54 +0100
parents 1e95f48d9886
children 15b406c7cd9d
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<T extends PatchGenerator.ChunkSequence<?>> {
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44
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45 private Map<Chunk, IntVector> chunk2UseIndex;
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46 private T 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<T> matchInspector;
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52
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53 public void init(T s1, T s2) {
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54 seq1 = s1;
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55 seq2 = s2;
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56 prepare(s2);
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57 }
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58
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59
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60 private void prepare(T s2) {
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61 chunk2UseIndex = new HashMap<Chunk, IntVector>();
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62 for (int i = 0, len = s2.chunkCount(); i < len; i++) {
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63 Chunk bc = s2.chunk(i);
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64 IntVector loc = chunk2UseIndex.get(bc);
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65 if (loc == null) {
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66 chunk2UseIndex.put(bc, loc = new IntVector());
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67 }
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68 loc.add(i);
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69 // bc.registerUseIn(i) - BEWARE, use of bc here is incorrect
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70 // in this case need to find the only ByteChain to keep indexes
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71 // i.e. when there are few equal ByteChain instances, notion of "usedIn" shall be either shared (reference same vector)
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72 // or kept within only one of them
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73 }
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74 // for (ChunkSequence.ByteChain bc : chunk2UseIndex.keySet()) {
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75 // System.out.printf("%s: {", new String(bc.data()));
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76 // for (int x : chunk2UseIndex.get(bc).toArray()) {
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77 // System.out.printf(" %d,", x);
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78 // }
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79 // System.out.println("}");
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80 // }
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81 }
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82
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83 public void findMatchingBlocks(MatchInspector<T> insp) {
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84 insp.begin(seq1, seq2);
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85 matchInspector = insp;
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86 findMatchingBlocks(0, seq1.chunkCount(), 0, seq2.chunkCount());
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87 insp.end();
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88 }
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89
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90 /**
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91 * implementation based on Python's difflib.py and SequenceMatcher
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92 */
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93 public int longestMatch(int startS1, int endS1, int startS2, int endS2) {
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94 matchStartS1 = matchStartS2 = 0;
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95 int maxLength = 0;
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96 IntMap<Integer> chunkIndex2MatchCount = new IntMap<Integer>(8);
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97 for (int i = startS1; i < endS1; i++) {
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98 Chunk bc = seq1.chunk(i);
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99 IntMap<Integer> newChunkIndex2MatchCount = new IntMap<Integer>(8);
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100 IntVector occurencesInS2 = chunk2UseIndex.get(bc);
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101 if (occurencesInS2 == null) {
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102 // chunkIndex2MatchCount.clear(); // TODO need clear instead of new instance
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103 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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104 continue;
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105 }
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106 for (int j : occurencesInS2.toArray()) {
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107 // s1[i] == s2[j]
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108 if (j < startS2) {
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109 continue;
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110 }
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111 if (j >= endS2) {
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112 break;
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113 }
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114 int prevChunkMatches = chunkIndex2MatchCount.containsKey(j-1) ? chunkIndex2MatchCount.get(j-1) : 0;
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115 int k = prevChunkMatches + 1;
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116 newChunkIndex2MatchCount.put(j, k);
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117 if (k > maxLength) {
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118 matchStartS1 = i-k+1;
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119 matchStartS2 = j-k+1;
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120 maxLength = k;
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121 }
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122 }
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123 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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124 }
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125 return maxLength;
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126 }
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127
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128 private void findMatchingBlocks(int startS1, int endS1, int startS2, int endS2) {
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129 int matchLength = longestMatch(startS1, endS1, startS2, endS2);
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130 if (matchLength > 0) {
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131 final int saveStartS1 = matchStartS1, saveStartS2 = matchStartS2;
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132 if (startS1 < matchStartS1 && startS2 < matchStartS2) {
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133 findMatchingBlocks(startS1, matchStartS1, startS2, matchStartS2);
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134 }
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135 matchInspector.match(saveStartS1, saveStartS2, matchLength);
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136 if (saveStartS1+matchLength < endS1 && saveStartS2+matchLength < endS2) {
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137 findMatchingBlocks(saveStartS1 + matchLength, endS1, saveStartS2 + matchLength, endS2);
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138 }
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139 }
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140 }
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141
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142 interface MatchInspector<T extends ChunkSequence<?>> {
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143 void begin(T s1, T s2);
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144 void match(int startSeq1, int startSeq2, int matchLength);
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145 void end();
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146 }
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147
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148 static class MatchDumpInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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149 public void begin(T s1, T s2) {
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150 }
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151
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152 public void match(int startSeq1, int startSeq2, int matchLength) {
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153 System.out.printf("match: from line #%d and line #%d of length %d\n", startSeq1, startSeq2, matchLength);
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154 }
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155
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156 public void end() {
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157 }
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158 }
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159
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160 static class DeltaInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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161 protected int changeStartS1, changeStartS2;
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162 protected T seq1, seq2;
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163
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164 public void begin(T s1, T s2) {
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165 seq1 = s1;
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166 seq2 = s2;
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167 changeStartS1 = changeStartS2 = 0;
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168 }
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169
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170 public void match(int startSeq1, int startSeq2, int matchLength) {
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171 reportDeltaElement(startSeq1, startSeq2, matchLength);
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172 changeStartS1 = startSeq1 + matchLength;
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173 changeStartS2 = startSeq2 + matchLength;
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174 }
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175
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176 public void end() {
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177 if (changeStartS1 < seq1.chunkCount() || changeStartS2 < seq2.chunkCount()) {
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178 reportDeltaElement(seq1.chunkCount(), seq2.chunkCount(), 0);
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179 }
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180 }
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181
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182 protected void reportDeltaElement(int matchStartSeq1, int matchStartSeq2, int matchLength) {
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183 if (changeStartS1 < matchStartSeq1) {
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184 if (changeStartS2 < matchStartSeq2) {
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185 changed(changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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186 } else {
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187 assert changeStartS2 == matchStartSeq2;
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188 deleted(matchStartSeq2, changeStartS1, matchStartSeq1);
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189 }
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190 } else {
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191 assert changeStartS1 == matchStartSeq1;
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192 if(changeStartS2 < matchStartSeq2) {
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193 added(matchStartSeq1, changeStartS2, matchStartSeq2);
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194 } else {
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195 assert changeStartS2 == matchStartSeq2;
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196 System.out.printf("adjustent equal blocks %d, %d and %d,%d\n", changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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197 }
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198 }
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199 if (matchLength > 0) {
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200 unchanged(matchStartSeq1, matchStartSeq2, matchLength);
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201 }
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202 }
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203
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204 /**
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205 * [s1From..s1To) replaced with [s2From..s2To)
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206 */
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207 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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208 // NO-OP
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209 }
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210
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211 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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212 // NO-OP
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213 }
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214
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215 protected void added(int s1InsertPoint, int s2From, int s2To) {
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216 // NO-OP
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217 }
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218
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219 protected void unchanged(int s1From, int s2From, int length) {
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220 // NO-OP
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221 }
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222 }
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223
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224 static class DeltaDumpInspector<T extends ChunkSequence<?>> extends DeltaInspector<T> {
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225
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226 @Override
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227 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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228 System.out.printf("changed [%d..%d) with [%d..%d)\n", s1From, s1To, s2From, s2To);
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229 }
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230
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231 @Override
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232 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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233 System.out.printf("deleted [%d..%d)\n", s1From, s1To);
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234 }
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235
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236 @Override
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237 protected void added(int s1InsertPoint, int s2From, int s2To) {
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238 System.out.printf("added [%d..%d) at %d\n", s2From, s2To, s1InsertPoint);
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239 }
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240
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241 }
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242
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243 public static void main(String[] args) throws Exception {
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244 PatchGenerator<LineSequence> pg1 = new PatchGenerator<LineSequence>();
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245 pg1.init(LineSequence.newlines("hello".getBytes()), LineSequence.newlines("hello\nworld".getBytes()));
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246 pg1.findMatchingBlocks(new MatchDumpInspector<LineSequence>());
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247 pg1.findMatchingBlocks(new DeltaDumpInspector<LineSequence>());
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248 if (Boolean.FALSE.booleanValue()) {
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249 return;
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250 }
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251 HgRepository repo = new HgLookup().detectFromWorkingDir();
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252 HgDataFile df = repo.getFileNode("cmdline/org/tmatesoft/hg/console/Main.java");
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253 ByteArrayChannel bac1, bac2;
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254 df.content(80, bac1 = new ByteArrayChannel());
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255 df.content(81, bac2 = new ByteArrayChannel());
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256 // String s1 = "line 1\nline 2\r\nline 3\n\nline 1\nline 2";
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257 // String s2 = "abc\ncdef\r\nline 2\r\nline 3\nline 2";
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258 PatchGenerator<LineSequence> pg = new PatchGenerator<LineSequence>();
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259 byte[] data1 = bac1.toArray();
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260 byte[] data2 = bac2.toArray();
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261 pg.init(new LineSequence(data1).splitByNewlines(), new LineSequence(data2).splitByNewlines());
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262 System.out.println("Matches:");
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263 pg.findMatchingBlocks(new MatchDumpInspector<LineSequence>());
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264 System.out.println("Deltas:");
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265 pg.findMatchingBlocks(new DeltaDumpInspector<LineSequence>());
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266 }
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267
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268 /**
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269 * Unsure if this marker interface worth presence
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270 */
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271 public interface Chunk {
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272 }
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273
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274 /**
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275 * Generic sequence of chunk, where chunk is anything comparable to another chunk, e.g. a string or a single char
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276 * Sequence diff algorithm above doesn't care about sequence nature.
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277 */
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278 public interface ChunkSequence<T extends Chunk> {
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279 public T chunk(int index);
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280 public int chunkCount();
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281 }
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282
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283 static final class LineSequence implements ChunkSequence<LineSequence.ByteChain> {
533
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284
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285 private final byte[] input;
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286 private ArrayList<ByteChain> lines;
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287
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288 public LineSequence(byte[] data) {
533
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289 input = data;
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290 }
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291
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292 public static LineSequence newlines(byte[] array) {
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293 return new LineSequence(array).splitByNewlines();
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294 }
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295
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296 public LineSequence splitByNewlines() {
533
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297 lines = new ArrayList<ByteChain>();
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298 int lastStart = 0;
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299 for (int i = 0; i < input.length; i++) {
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300 if (input[i] == '\n') {
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301 lines.add(new ByteChain(lastStart, i+1));
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302 lastStart = i+1;
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303 } else if (input[i] == '\r') {
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304 if (i+1 < input.length && input[i+1] == '\n') {
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305 i++;
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306 }
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307 lines.add(new ByteChain(lastStart, i+1));
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308 lastStart = i+1;
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309 }
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310 }
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311 if (lastStart < input.length) {
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312 lines.add(new ByteChain(lastStart, input.length));
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313 }
538
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314 // empty chunk to keep offset of input end
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315 lines.add(new ByteChain(input.length, input.length));
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316 return this;
533
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317 }
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318
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319 public ByteChain chunk(int index) {
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320 return lines.get(index);
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321 }
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322
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323 public int chunkCount() {
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324 return lines.size();
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325 }
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326
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327 public byte[] data(int chunkFrom, int chunkTo) {
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328 if (chunkFrom == chunkTo) {
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329 return new byte[0];
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330 }
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331 int from = chunk(chunkFrom).getOffset(), to = chunk(chunkTo).getOffset();
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332 byte[] rv = new byte[to - from];
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333 System.arraycopy(input, from, rv, 0, rv.length);
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334 return rv;
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335 }
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336
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337
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338 final class ByteChain implements Chunk {
533
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339 private final int start, end;
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340 private final int hash;
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341
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342 ByteChain(int s, int e) {
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343 start = s;
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344 end = e;
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345 hash = calcHash(input, s, e);
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346 }
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347
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348 /**
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349 * byte offset of the this ByteChain inside ChainSequence
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350 */
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351 public int getOffset() {
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352 return start;
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353 }
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354
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355 public byte[] data() {
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356 byte[] rv = new byte[end - start];
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357 System.arraycopy(input, start, 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 @Override
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362 public boolean equals(Object obj) {
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363 if (obj == null || obj.getClass() != ByteChain.class) {
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364 return false;
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365 }
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366 ByteChain other = (ByteChain) obj;
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367 if (other.hash != hash || other.end - other.start != end - start) {
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368 return false;
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369 }
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370 return other.match(input, start);
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371 }
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372
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373 private boolean match(byte[] oi, int from) {
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374 for (int i = start, j = from; i < end; i++, j++) {
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375 if (LineSequence.this.input[i] != oi[j]) {
533
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376 return false;
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377 }
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378 }
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379 return true;
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380 }
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381
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382 @Override
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383 public int hashCode() {
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384 return hash;
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385 }
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386
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387 @Override
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388 public String toString() {
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389 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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390 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
391 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
392
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
393 // 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
394 static int calcHash(byte[] data, int from, int to) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
395 int result = 1;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
396 for (int i = from; i < to; i++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
397 result = 31 * result + data[i];
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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398 }
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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399 return result;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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400 }
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 }