Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/diff/ReverseAnnotateInspector.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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18
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19
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21
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22 import java.util.Arrays;
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23
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24 import org.tmatesoft.hg.core.HgAnnotateCommand;
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25 import org.tmatesoft.hg.core.HgBlameInspector;
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26 import org.tmatesoft.hg.core.HgIterateDirection;
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27 import org.tmatesoft.hg.core.HgBlameInspector.RevisionDescriptor;
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28 import org.tmatesoft.hg.core.HgCallbackTargetException;
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29 import org.tmatesoft.hg.internal.IntMap;
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30 import org.tmatesoft.hg.repo.HgInvalidStateException;
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31 import org.tmatesoft.hg.util.CancelSupport;
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32 import org.tmatesoft.hg.util.CancelledException;
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33 import org.tmatesoft.hg.util.ProgressSupport;
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34
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35 /**
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36 * Produce output like 'hg annotate' does.
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37 * Expects revisions to come in order from child to parent.
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38 * Unlike {@link ForwardAnnotateInspector}, can be easily modified to report lines as soon as its origin is detected.
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39 *
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40 * (+) Handles annotate of partial history, at any moment lines with ({@link #knownLines} == <code>false</code> indicate lines
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41 * that were added prior to any revision already visited.
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class ReverseAnnotateInspector implements HgBlameInspector, RevisionDescriptor.Recipient {
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47
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48 // keeps <startSeq1, startSeq2, len> of equal blocks, origin to target, from some previous step
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49 private RangePairSeq activeEquals;
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50 // equal blocks of the current iteration, to be recalculated before next step
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51 // to track line number (current target to ultimate target) mapping
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52 private RangePairSeq intermediateEquals = new RangePairSeq();
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53
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54 private boolean[] knownLines;
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55 private RevisionDescriptor revisionDescriptor;
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56 private BlockData lineContent;
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57
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58 private IntMap<RangePairSeq> mergedRanges = new IntMap<RangePairSeq>(10);
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59 private IntMap<RangePairSeq> equalRanges = new IntMap<RangePairSeq>(10);
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60 private boolean activeEqualsComesFromMerge = false;
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61
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62 private int[] lineRevisions;
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63 private int[] lineNumbers;
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64
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65 /**
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66 * @return desired order of iteration for diff
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67 */
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68 public HgIterateDirection iterateDirection() {
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69 return HgIterateDirection.NewToOld;
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70 }
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72 public void report(int annotateRevIndex, HgAnnotateCommand.Inspector insp, ProgressSupport progress, CancelSupport cancel) throws HgCallbackTargetException, CancelledException {
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73 LineImpl li = new LineImpl();
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74 progress.start(lineRevisions.length);
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75 for (int i = 0; i < lineRevisions.length; i++) {
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76 byte[] c = lineContent.elementAt(i).asArray();
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77 li.init(i+1, lineNumbers[i] + 1, lineRevisions[i], c);
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78 insp.next(li);
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79 progress.worked(1);
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80 cancel.checkCancelled();
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81 }
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82 progress.done();
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83 }
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85 public void start(RevisionDescriptor rd) {
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86 revisionDescriptor = rd;
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87 if (knownLines == null) {
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88 lineContent = rd.target();
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89 knownLines = new boolean[lineContent.elementCount()];
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90 lineRevisions = new int [knownLines.length];
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91 Arrays.fill(lineRevisions, NO_REVISION);
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92 lineNumbers = new int[knownLines.length];
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93 activeEquals = new RangePairSeq();
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94 activeEquals.add(0, 0, knownLines.length);
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95 equalRanges.put(rd.targetChangesetIndex(), activeEquals);
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96 } else {
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97 activeEquals = equalRanges.get(rd.targetChangesetIndex());
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98 if (activeEquals == null) {
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99 // we didn't see this target revision as origin yet
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100 // the only way this may happen is that this revision was a merge parent
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101 activeEquals = mergedRanges.get(rd.targetChangesetIndex());
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102 activeEqualsComesFromMerge = true;
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103 if (activeEquals == null) {
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104 throw new HgInvalidStateException(String.format("Can't find previously visited revision %d (while in %d->%1$d diff)", rd.targetChangesetIndex(), rd.originChangesetIndex()));
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105 }
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106 }
555
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107 }
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108 }
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109
557
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110 public void done(RevisionDescriptor rd) {
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111 // update line numbers of the intermediate target to point to ultimate target's line numbers
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112 RangePairSeq v = intermediateEquals.intersect(activeEquals);
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113 if (activeEqualsComesFromMerge) {
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114 mergedRanges.put(rd.originChangesetIndex(), v);
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115 } else {
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116 equalRanges.put(rd.originChangesetIndex(), v);
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117 }
560
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118 if (rd.isMerge() && !mergedRanges.containsKey(rd.mergeChangesetIndex())) {
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119 // seen merge, but no lines were merged from p2.
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120 // Add empty range to avoid uncertainty when a parent of p2 pops in
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121 mergedRanges.put(rd.mergeChangesetIndex(), new RangePairSeq());
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122 }
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123 intermediateEquals.clear();
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124 activeEquals = null;
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125 activeEqualsComesFromMerge = false;
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126 revisionDescriptor = null;
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127 }
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128
557
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129 public void same(EqualBlock block) {
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130 intermediateEquals.add(block.originStart(), block.targetStart(), block.length());
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131 }
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132
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133 public void added(AddBlock block) {
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134 RangePairSeq rs = null;
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135 if (revisionDescriptor.isMerge() && block.originChangesetIndex() == revisionDescriptor.mergeChangesetIndex()) {
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136 rs = mergedRanges.get(revisionDescriptor.mergeChangesetIndex());
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137 if (rs == null) {
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138 mergedRanges.put(revisionDescriptor.mergeChangesetIndex(), rs = new RangePairSeq());
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139 }
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140 }
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141 if (activeEquals.size() == 0) {
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142 return;
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143 }
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144 for (int i = 0, ln = block.firstAddedLine(), x = block.totalAddedLines(); i < x; i++, ln++) {
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145 int lnInFinal = activeEquals.mapLineIndex(ln);
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146 if (lnInFinal != -1/* && !knownLines[lnInFinal]*/) {
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147 if (rs != null) {
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497e697636fc 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
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148 rs.add(block.mergeLineAt() + i, lnInFinal, 1);
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149 } else {
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150 line(lnInFinal, ln, block.targetChangesetIndex());
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151 }
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152 knownLines[lnInFinal] = true;
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153 }
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154 }
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155 }
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156
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157 public void changed(ChangeBlock block) {
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158 added(block);
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159 }
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160
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161 public void deleted(DeleteBlock block) {
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162 }
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163
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164 private void line(int lineNumber, int firstAppearance, int changesetRevIndex) {
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165 lineRevisions[lineNumber] = changesetRevIndex;
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166 lineNumbers[lineNumber] = firstAppearance;
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167 }
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168 }