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annotate src/org/tmatesoft/hg/internal/diff/DiffRangeMap.java @ 680:58a6900f845d

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Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:15:34 +0200
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children f568330dd9c0
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58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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1 /*
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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2 * Copyright (c) 2013 TMate Software Ltd
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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3 *
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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4 * This program is free software; you can redistribute it and/or modify
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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5 * it under the terms of the GNU General Public License as published by
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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8 * This program is distributed in the hope that it will be useful,
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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11 * GNU General Public License for more details.
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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12 *
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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13 * For information on how to redistribute this software under
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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14 * the terms of a license other than GNU General Public License
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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.diff;
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19 import java.util.ArrayList;
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21 import org.tmatesoft.hg.internal.DiffHelper;
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22 import org.tmatesoft.hg.internal.IntSliceSeq;
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23 import org.tmatesoft.hg.internal.IntTuple;
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24 import org.tmatesoft.hg.internal.DiffHelper.ChunkSequence;
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25
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26 /**
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27 * Sequence of pairs of ranges (s1Start,s1End) - (s2Start, s2End)
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28 * @author Artem Tikhomirov
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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29 * @author TMate Software Ltd.
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30 */
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31 public class DiffRangeMap extends DiffHelper.DeltaInspector<ChunkSequence<?>> {
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32 private final IntSliceSeq ranges;
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33
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34 public DiffRangeMap() {
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
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35 ranges = new IntSliceSeq(5);
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36 }
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37
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38 /**
58a6900f845d Blame: alternative strategy to handle merge revisions: map(diff(p1->base->p2)) to understand merge intentions better
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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39 * handy method to fill this map from supplied DiffHelper
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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40 * <pre>
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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41 * DiffHelper<LineSequence> pg = ...
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42 * pg.findMatchingBlocks(p1ToBase); // doesn't compile
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43 * DiffHelper<?> dh = pg;
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44 * dh.findMatchingBlocks(p1ToBase); // compiles ok!
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45 * </pre>
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46 */
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47 public DiffRangeMap fill(DiffHelper<?> dh) {
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48 dh.findMatchingBlocks(this);
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49 return this;
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50 }
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51
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52 @Override
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53 protected void added(int s1InsertPoint, int s2From, int s2To) {
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54 ranges.add(s1InsertPoint, s1InsertPoint, s2From, s2To, (int)'+');
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55 }
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56 @Override
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57 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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58 ranges.add(s1From, s1To, s2From, s2To, (int)'*');
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59 }
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60 @Override
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61 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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62 ranges.add(s1From, s1To, s2DeletePoint, s2DeletePoint, (int)'-');
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63 }
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64 @Override
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65 protected void unchanged(int s1From, int s2From, int length) {
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66 ranges.add(s1From, s1From + length, s2From, s2From + length, (int)'=');
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67 }
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68
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69 public Iterable<RangePair> findInSource(int sourceStart, int sourceEnd) {
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70 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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71 for (IntTuple t : ranges) {
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72 int srcRangeStart = t.at(0);
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73 int srcRangeEnd = t.at(1);
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74 if (srcRangeEnd <= sourceStart) { // srcRangeEnd exclusive
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75 continue;
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76 }
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77 if (srcRangeStart >= sourceEnd) {
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78 break;
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79 }
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80 rv.add(new RangePair(srcRangeStart, srcRangeEnd, t.at(2), t.at(3)));
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81 }
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82 return rv;
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83 }
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84
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85 public Iterable<RangePair> insertions() {
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86 return rangesOfKind('+');
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87 }
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88
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89 public Iterable<RangePair> same() {
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90 return rangesOfKind('=');
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91 }
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92
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93 private Iterable<RangePair> rangesOfKind(int kind) {
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94 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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95 for (IntTuple t : ranges) {
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96 if (t.at(4) == kind) {
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97 rv.add(new RangePair(t.at(0), t.at(1), t.at(2), t.at(3)));
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98 }
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99 }
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100 return rv;
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101 }
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102
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103 public static final class RangePair {
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104 private final int s1Start;
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105 private final int s1End;
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106 private final int s2Start;
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107 private final int s2End;
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108
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109 public RangePair(int s1Start, int s1End, int s2Start, int s2End) {
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110 this.s1Start = s1Start;
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111 this.s1End = s1End;
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112 this.s2Start = s2Start;
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113 this.s2End = s2End;
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114 }
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115 public int start1() {
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116 return s1Start;
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117 }
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118 public int end1() {
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119 return s1End;
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120 }
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121 public int length1() {
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122 return s1End - s1Start;
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123 }
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124 public int start2() {
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125 return s2Start;
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126 }
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127 public int end2() {
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128 return s2End;
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129 }
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130 public int length2() {
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131 return s2End - s2Start;
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132 }
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133 @Override
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134 public String toString() {
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135 return String.format("[%d..%d)->[%d..%d)", s1Start, s1End, s2Start, s2End);
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136 }
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137 }
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138 }