Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DiffHelper.java @ 619:868b2ffdcd5c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Close FIS, not FileChannel, to clear both references to FileDescriptor right away
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 17 May 2013 22:04:23 +0200
parents 47dfa0ec7e35
children 507602cb4fb3
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.HgInvalidStateException;
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24
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25 /**
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26 * 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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27 *
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28 * 522: 233748 0 103 17438 433 522 521 -1 756073cf2321df44d3ed0585f2a5754bc8a1b2f6
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29 * <PATCH>:
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30 * 3487..3578, 91:src/org/tmatesoft/hg/core/HgIterateDirection.java\00add61a8a665c5d8f092210767f812fe0d335ac8
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31 *
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32 * 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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33 * in the patch.
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34 *
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35 * Mercurial paper describes reasons for choosing this approach to delta generation, too.
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36 *
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class DiffHelper<T extends DiffHelper.ChunkSequence<?>> {
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42
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43 private Map<Object, IntVector> chunk2UseIndex;
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44 private T seq1, seq2;
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45
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46 // get filled by #longestMatch, track start of common sequence in seq1 and seq2, respectively
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47 private int matchStartS1, matchStartS2;
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48
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49 private MatchInspector<T> matchInspector;
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50
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51 public void init(T s1, T s2) {
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52 seq1 = s1;
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53 seq2 = s2;
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54 prepare(s2);
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55 }
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56
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57 public void init(T s1) {
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58 if (seq2 == null) {
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59 throw new IllegalStateException("Use this #init() only when target sequence shall be matched against different origin");
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60 }
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61 seq1 = s1;
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62 }
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63
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64
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65 private void prepare(T s2) {
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66 chunk2UseIndex = new HashMap<Object, IntVector>();
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67 for (int i = 0, len = s2.chunkCount(); i < len; i++) {
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68 Object bc = s2.chunk(i);
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69 IntVector loc = chunk2UseIndex.get(bc);
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70 if (loc == null) {
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71 chunk2UseIndex.put(bc, loc = new IntVector());
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72 }
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73 loc.add(i);
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74 // bc.registerUseIn(i) - BEWARE, use of bc here is incorrect
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75 // in this case need to find the only ByteChain to keep indexes
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76 // i.e. when there are few equal ByteChain instances, notion of "usedIn" shall be either shared (reference same vector)
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77 // or kept within only one of them
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78 }
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79 }
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80
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81 public void findMatchingBlocks(MatchInspector<T> insp) {
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82 insp.begin(seq1, seq2);
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83 matchInspector = insp;
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84 findMatchingBlocks(0, seq1.chunkCount(), 0, seq2.chunkCount());
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85 insp.end();
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86 }
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87
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88 /**
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89 * implementation based on Python's difflib.py and SequenceMatcher
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90 */
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91 public int longestMatch(int startS1, int endS1, int startS2, int endS2) {
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92 matchStartS1 = matchStartS2 = 0;
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93 int maxLength = 0;
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94 IntMap<Integer> chunkIndex2MatchCount = new IntMap<Integer>(8);
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95 for (int i = startS1; i < endS1; i++) {
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96 Object bc = seq1.chunk(i);
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97 IntVector occurencesInS2 = chunk2UseIndex.get(bc);
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98 if (occurencesInS2 == null) {
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99 chunkIndex2MatchCount.clear();
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100 continue;
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101 }
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102 IntMap<Integer> newChunkIndex2MatchCount = new IntMap<Integer>(8);
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103 for (int j : occurencesInS2.toArray()) {
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104 // s1[i] == s2[j]
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105 if (j < startS2) {
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106 continue;
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107 }
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108 if (j >= endS2) {
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109 break;
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110 }
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111 int prevChunkMatches = chunkIndex2MatchCount.containsKey(j-1) ? chunkIndex2MatchCount.get(j-1) : 0;
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112 int k = prevChunkMatches + 1;
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113 newChunkIndex2MatchCount.put(j, k);
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114 if (k > maxLength) {
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115 matchStartS1 = i-k+1;
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116 matchStartS2 = j-k+1;
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117 maxLength = k;
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118 }
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119 }
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120 chunkIndex2MatchCount = newChunkIndex2MatchCount;
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121 }
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122 return maxLength;
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123 }
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124
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125 private void findMatchingBlocks(int startS1, int endS1, int startS2, int endS2) {
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126 int matchLength = longestMatch(startS1, endS1, startS2, endS2);
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127 if (matchLength > 0) {
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128 final int saveStartS1 = matchStartS1, saveStartS2 = matchStartS2;
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129 if (startS1 < matchStartS1 && startS2 < matchStartS2) {
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130 findMatchingBlocks(startS1, matchStartS1, startS2, matchStartS2);
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131 }
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132 matchInspector.match(saveStartS1, saveStartS2, matchLength);
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133 if (saveStartS1+matchLength < endS1 && saveStartS2+matchLength < endS2) {
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134 findMatchingBlocks(saveStartS1 + matchLength, endS1, saveStartS2 + matchLength, endS2);
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135 }
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136 }
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137 }
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138
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139 public interface MatchInspector<T extends ChunkSequence<?>> {
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140 void begin(T s1, T s2);
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141 void match(int startSeq1, int startSeq2, int matchLength);
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142 void end();
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143 }
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144
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145 static class MatchDumpInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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146 private int matchCount;
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147
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148 public void begin(T s1, T s2) {
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149 matchCount = 0;
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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 matchCount++;
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154 System.out.printf("match #%d: from line #%d and line #%d of length %d\n", matchCount, 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 if (matchCount == 0) {
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159 System.out.println("NO MATCHES FOUND!");
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160 }
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161 }
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162 }
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163
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164 /**
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165 * Matcher implementation that translates "match/equal" notification to a delta-style "added/removed/changed".
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166 */
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167 public static class DeltaInspector<T extends ChunkSequence<?>> implements MatchInspector<T> {
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168 protected int changeStartS1, changeStartS2;
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169 protected T seq1, seq2;
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170
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171 public void begin(T s1, T s2) {
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172 seq1 = s1;
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173 seq2 = s2;
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174 changeStartS1 = changeStartS2 = 0;
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175 }
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176
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177 public void match(int startSeq1, int startSeq2, int matchLength) {
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178 reportDeltaElement(startSeq1, startSeq2, matchLength);
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179 changeStartS1 = startSeq1 + matchLength;
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180 changeStartS2 = startSeq2 + matchLength;
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181 }
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182
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183 public void end() {
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184 if (changeStartS1 < seq1.chunkCount()-1 || changeStartS2 < seq2.chunkCount()-1) {
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185 reportDeltaElement(seq1.chunkCount()-1, seq2.chunkCount()-1, 0);
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186 }
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187 }
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188
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189 protected void reportDeltaElement(int matchStartSeq1, int matchStartSeq2, int matchLength) {
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190 if (changeStartS1 < matchStartSeq1) {
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191 if (changeStartS2 < matchStartSeq2) {
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192 changed(changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2);
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193 } else {
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194 assert changeStartS2 == matchStartSeq2;
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195 deleted(matchStartSeq2, changeStartS1, matchStartSeq1);
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196 }
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197 } else {
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198 assert changeStartS1 == matchStartSeq1;
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199 if(changeStartS2 < matchStartSeq2) {
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200 added(changeStartS1, changeStartS2, matchStartSeq2);
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201 } else {
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202 assert changeStartS2 == matchStartSeq2;
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203 if (matchStartSeq1 > 0 || matchStartSeq2 > 0) {
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204 // FIXME perhaps, exception is too much for the case
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205 // once diff is covered with tests, replace with assert false : msg;
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206 throw new HgInvalidStateException(String.format("adjustent equal blocks %d, %d and %d,%d", changeStartS1, matchStartSeq1, changeStartS2, matchStartSeq2));
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207 }
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208 }
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209 }
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210 if (matchLength > 0) {
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211 unchanged(matchStartSeq1, matchStartSeq2, matchLength);
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212 }
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213 }
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214
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215 /**
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216 * [s1From..s1To) replaced with [s2From..s2To)
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217 */
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218 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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219 // NO-OP
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220 }
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221
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222 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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223 // NO-OP
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224 }
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225
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226 protected void added(int s1InsertPoint, int s2From, int s2To) {
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227 // NO-OP
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228 }
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229
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230 protected void unchanged(int s1From, int s2From, int length) {
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231 // NO-OP
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232 }
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233 }
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234
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235 public static class DeltaDumpInspector<T extends ChunkSequence<?>> extends DeltaInspector<T> {
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236
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237 @Override
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238 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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239 System.out.printf("changed [%d..%d) with [%d..%d)\n", s1From, s1To, s2From, s2To);
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240 }
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241
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242 @Override
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243 protected void deleted(int s2DeletionPoint, int s1From, int s1To) {
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244 System.out.printf("deleted [%d..%d)\n", s1From, s1To);
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245 }
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246
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247 @Override
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248 protected void added(int s1InsertPoint, int s2From, int s2To) {
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249 System.out.printf("added [%d..%d) at %d\n", s2From, s2To, s1InsertPoint);
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250 }
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251
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252 @Override
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253 protected void unchanged(int s1From, int s2From, int length) {
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254 System.out.printf("same [%d..%d) and [%d..%d)\n", s1From, s1From + length, s2From, s2From + length);
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255 }
542
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256 }
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257
544
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258 /**
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259 * Generic sequence of chunk, where chunk is anything comparable to another chunk, e.g. a string or a single char
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260 * Sequence diff algorithm above doesn't care about sequence nature.
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261 */
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262 public interface ChunkSequence<T> {
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263 public T chunk(int index);
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264 public int chunkCount();
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265 }
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266
551
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267 public static final class LineSequence implements ChunkSequence<LineSequence.ByteChain> {
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268
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269 private final byte[] input;
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270 private ArrayList<ByteChain> lines;
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271
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272 public LineSequence(byte[] data) {
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273 input = data;
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274 }
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275
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276 public static LineSequence newlines(byte[] array) {
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277 return new LineSequence(array).splitByNewlines();
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278 }
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279
545
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280 // sequence ends with fake, empty line chunk
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281 public LineSequence splitByNewlines() {
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282 lines = new ArrayList<ByteChain>();
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283 int lastStart = 0;
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284 for (int i = 0; i < input.length; i++) {
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285 if (input[i] == '\n') {
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286 lines.add(new ByteChain(lastStart, i+1));
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287 lastStart = i+1;
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288 } else if (input[i] == '\r') {
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289 if (i+1 < input.length && input[i+1] == '\n') {
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290 i++;
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291 }
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292 lines.add(new ByteChain(lastStart, i+1));
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293 lastStart = i+1;
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294 }
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295 }
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296 if (lastStart < input.length) {
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297 lines.add(new ByteChain(lastStart, input.length));
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298 }
538
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299 // empty chunk to keep offset of input end
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300 lines.add(new ByteChain(input.length));
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301 return this;
533
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302 }
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303
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304 public ByteChain chunk(int index) {
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305 return lines.get(index);
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306 }
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307
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308 public int chunkCount() {
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309 return lines.size();
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310 }
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311
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312 public byte[] data(int chunkFrom, int chunkTo) {
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313 if (chunkFrom == chunkTo) {
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314 return new byte[0];
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315 }
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316 int from = chunk(chunkFrom).getOffset(), to = chunk(chunkTo).getOffset();
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317 byte[] rv = new byte[to - from];
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318 System.arraycopy(input, from, rv, 0, rv.length);
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319 return rv;
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320 }
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321
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322
556
e55f17a7a195 AnnotateFacility renamed to HgBlameFacility and exposed, API shapes out and got some javadoc
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323 public final class ByteChain {
533
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324 private final int start, end;
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325 private final int hash;
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326
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327 /**
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328 * construct a chunk with a sole purpose to keep
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329 * offset of the data end
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330 */
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331 ByteChain(int offset) {
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332 start = end = offset;
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333 // ensure this chunk doesn't match trailing chunk of another sequence
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334 hash = System.identityHashCode(this);
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335 }
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336
533
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337 ByteChain(int s, int e) {
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338 start = s;
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339 end = e;
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340 hash = calcHash(input, s, e);
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341 }
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342
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343 /**
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344 * byte offset of the this ByteChain inside ChainSequence
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345 */
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346 public int getOffset() {
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347 return start;
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348 }
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349
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350 public byte[] data() {
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351 byte[] rv = new byte[end - start];
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352 System.arraycopy(input, start, rv, 0, rv.length);
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353 return rv;
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354 }
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355
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356 @Override
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357 public boolean equals(Object obj) {
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358 if (obj == null || obj.getClass() != ByteChain.class) {
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359 return false;
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360 }
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361 ByteChain other = (ByteChain) obj;
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362 if (other.hash != hash || other.end - other.start != end - start) {
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363 return false;
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364 }
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365 return other.match(input, start);
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366 }
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367
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368 private boolean match(byte[] oi, int from) {
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369 for (int i = start, j = from; i < end; i++, j++) {
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370 if (LineSequence.this.input[i] != oi[j]) {
533
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371 return false;
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372 }
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373 }
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374 return true;
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375 }
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376
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377 @Override
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378 public int hashCode() {
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379 return hash;
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380 }
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381
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382 @Override
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383 public String toString() {
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384 return String.format("[@%d\"%s\"]", start, new String(data()));
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385 }
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386 }
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387
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388 // same as Arrays.hashCode(byte[]), just for a slice of a bigger array
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389 static int calcHash(byte[] data, int from, int to) {
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390 int result = 1;
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391 for (int i = from; i < to; i++) {
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
392 result = 31 * result + data[i];
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 result;
e6f72c9829a6 Generate patches using diff algorithm
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
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 }