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annotate src/org/tmatesoft/hg/internal/diff/DiffRangeMap.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 7839ff0bfd78
children
rev   line source
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal.diff;
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19 import java.util.ArrayList;
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21 import org.tmatesoft.hg.internal.IntSliceSeq;
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22 import org.tmatesoft.hg.internal.IntTuple;
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23 import org.tmatesoft.hg.internal.diff.DiffHelper.ChunkSequence;
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24 import org.tmatesoft.hg.internal.diff.DiffHelper.MatchInspector;
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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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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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34 public DiffRangeMap() {
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35 ranges = new IntSliceSeq(5);
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36 }
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37
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38 /**
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39 * handy method to fill this map from supplied DiffHelper
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40 * <pre>
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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 @SuppressWarnings("unchecked")
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48 public DiffRangeMap fill(DiffHelper<?> dh) {
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49 @SuppressWarnings("rawtypes")
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50 final MatchInspector i = (MatchInspector) this;
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51 dh.findMatchingBlocks(i);
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52 return this;
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53 }
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54
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55 @Override
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56 protected void added(int s1InsertPoint, int s2From, int s2To) {
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57 ranges.add(s1InsertPoint, s1InsertPoint, s2From, s2To, (int)'+');
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58 }
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59 @Override
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60 protected void changed(int s1From, int s1To, int s2From, int s2To) {
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61 ranges.add(s1From, s1To, s2From, s2To, (int)'*');
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62 }
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63 @Override
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64 protected void deleted(int s2DeletePoint, int s1From, int s1To) {
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65 ranges.add(s1From, s1To, s2DeletePoint, s2DeletePoint, (int)'-');
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66 }
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67 @Override
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68 protected void unchanged(int s1From, int s2From, int length) {
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69 ranges.add(s1From, s1From + length, s2From, s2From + length, (int)'=');
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70 }
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71
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72 public Iterable<RangePair> findInSource(int sourceStart, int sourceEnd) {
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73 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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74 for (IntTuple t : ranges) {
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75 int srcRangeStart = t.at(0);
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76 int srcRangeEnd = t.at(1);
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77 if (srcRangeEnd <= sourceStart) { // srcRangeEnd exclusive
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78 continue;
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79 }
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80 if (srcRangeStart >= sourceEnd) {
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81 break;
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82 }
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83 rv.add(new RangePair(srcRangeStart, srcRangeEnd, t.at(2), t.at(3)));
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84 }
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85 return rv;
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86 }
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87
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88 public Iterable<RangePair> insertions() {
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89 return rangesOfKind('+');
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90 }
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91
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92 public Iterable<RangePair> same() {
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93 return rangesOfKind('=');
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94 }
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95
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96 private Iterable<RangePair> rangesOfKind(int kind) {
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97 ArrayList<RangePair> rv = new ArrayList<RangePair>(4);
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98 for (IntTuple t : ranges) {
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99 if (t.at(4) == kind) {
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100 rv.add(new RangePair(t.at(0), t.at(1), t.at(2), t.at(3)));
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101 }
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102 }
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103 return rv;
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104 }
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105
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106 public static final class RangePair {
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107 private final int s1Start;
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108 private final int s1End;
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109 private final int s2Start;
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110 private final int s2End;
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111
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112 public RangePair(int s1Start, int s1End, int s2Start, int s2End) {
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113 this.s1Start = s1Start;
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114 this.s1End = s1End;
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115 this.s2Start = s2Start;
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116 this.s2End = s2End;
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117 }
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118 public int start1() {
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119 return s1Start;
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120 }
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121 public int end1() {
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122 return s1End;
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123 }
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124 public int length1() {
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125 return s1End - s1Start;
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126 }
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127 public int start2() {
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128 return s2Start;
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129 }
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130 public int end2() {
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131 return s2End;
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132 }
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133 public int length2() {
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134 return s2End - s2Start;
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135 }
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136 @Override
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137 public String toString() {
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138 return String.format("[%d..%d)->[%d..%d)", s1Start, s1End, s2Start, s2End);
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139 }
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140 }
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141 }