Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/ReverseAnnotateInspector.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
parents 1c49c0cee540
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;
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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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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.repo.HgInvalidStateException;
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30 import org.tmatesoft.hg.util.CancelSupport;
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31 import org.tmatesoft.hg.util.CancelledException;
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32 import org.tmatesoft.hg.util.ProgressSupport;
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33
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34 /**
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35 * Produce output like 'hg annotate' does.
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36 * Expects revisions to come in order from child to parent.
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37 * Unlike {@link ForwardAnnotateInspector}, can be easily modified to report lines as soon as its origin is detected.
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38 *
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39 * (+) Handles annotate of partial history, at any moment lines with ({@link #knownLines} == <code>false</code> indicate lines
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40 * that were added prior to any revision already visited.
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class ReverseAnnotateInspector implements HgBlameInspector, RevisionDescriptor.Recipient {
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46
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47 // keeps <startSeq1, startSeq2, len> of equal blocks, origin to target, from some previous step
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48 private RangePairSeq activeEquals;
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49 // equal blocks of the current iteration, to be recalculated before next step
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50 // to track line number (current target to ultimate target) mapping
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51 private RangePairSeq intermediateEquals = new RangePairSeq();
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52
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53 private boolean[] knownLines;
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54 private RevisionDescriptor revisionDescriptor;
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55 private BlockData lineContent;
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56
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57 private IntMap<RangePairSeq> mergedRanges = new IntMap<RangePairSeq>(10);
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58 private IntMap<RangePairSeq> equalRanges = new IntMap<RangePairSeq>(10);
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59 private boolean activeEqualsComesFromMerge = false;
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60
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61 private int[] lineRevisions;
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62 private int[] lineNumbers;
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64 /**
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65 * @return desired order of iteration for diff
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66 */
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67 public HgIterateDirection iterateDirection() {
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68 return HgIterateDirection.NewToOld;
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69 }
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71 public void report(int annotateRevIndex, HgAnnotateCommand.Inspector insp, ProgressSupport progress, CancelSupport cancel) throws HgCallbackTargetException, CancelledException {
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72 LineImpl li = new LineImpl();
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73 progress.start(lineRevisions.length);
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74 for (int i = 0; i < lineRevisions.length; i++) {
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75 byte[] c = lineContent.elementAt(i).asArray();
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76 li.init(i+1, lineNumbers[i] + 1, lineRevisions[i], c);
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77 insp.next(li);
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78 progress.worked(1);
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79 cancel.checkCancelled();
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80 }
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81 progress.done();
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82 }
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84 public void start(RevisionDescriptor rd) {
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85 revisionDescriptor = rd;
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86 if (knownLines == null) {
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87 lineContent = rd.target();
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88 knownLines = new boolean[lineContent.elementCount()];
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89 lineRevisions = new int [knownLines.length];
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90 Arrays.fill(lineRevisions, NO_REVISION);
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91 lineNumbers = new int[knownLines.length];
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92 activeEquals = new RangePairSeq();
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93 activeEquals.add(0, 0, knownLines.length);
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94 equalRanges.put(rd.targetChangesetIndex(), activeEquals);
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95 } else {
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96 activeEquals = equalRanges.get(rd.targetChangesetIndex());
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97 if (activeEquals == null) {
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98 // we didn't see this target revision as origin yet
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99 // the only way this may happen is that this revision was a merge parent
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100 activeEquals = mergedRanges.get(rd.targetChangesetIndex());
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101 activeEqualsComesFromMerge = true;
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102 if (activeEquals == null) {
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103 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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104 }
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105 }
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106 }
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107 }
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108
557
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109 public void done(RevisionDescriptor rd) {
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110 // update line numbers of the intermediate target to point to ultimate target's line numbers
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111 RangePairSeq v = intermediateEquals.intersect(activeEquals);
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112 if (activeEqualsComesFromMerge) {
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113 mergedRanges.put(rd.originChangesetIndex(), v);
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114 } else {
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115 equalRanges.put(rd.originChangesetIndex(), v);
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116 }
560
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117 if (rd.isMerge() && !mergedRanges.containsKey(rd.mergeChangesetIndex())) {
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118 // seen merge, but no lines were merged from p2.
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119 // Add empty range to avoid uncertainty when a parent of p2 pops in
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120 mergedRanges.put(rd.mergeChangesetIndex(), new RangePairSeq());
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121 }
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122 intermediateEquals.clear();
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123 activeEquals = null;
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124 activeEqualsComesFromMerge = false;
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125 revisionDescriptor = null;
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126 }
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127
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128 public void same(EqualBlock block) {
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129 intermediateEquals.add(block.originStart(), block.targetStart(), block.length());
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130 }
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131
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132 public void added(AddBlock block) {
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133 RangePairSeq rs = null;
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134 if (revisionDescriptor.isMerge() && block.originChangesetIndex() == revisionDescriptor.mergeChangesetIndex()) {
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135 rs = mergedRanges.get(revisionDescriptor.mergeChangesetIndex());
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136 if (rs == null) {
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137 mergedRanges.put(revisionDescriptor.mergeChangesetIndex(), rs = new RangePairSeq());
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138 }
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139 }
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140 if (activeEquals.size() == 0) {
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141 return;
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142 }
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143 for (int i = 0, ln = block.firstAddedLine(), x = block.totalAddedLines(); i < x; i++, ln++) {
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144 int lnInFinal = activeEquals.mapLineIndex(ln);
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145 if (lnInFinal != -1/* && !knownLines[lnInFinal]*/) {
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146 if (rs != null) {
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147 rs.add(block.insertedAt() + i, lnInFinal, 1);
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148 } else {
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149 line(lnInFinal, ln, block.targetChangesetIndex());
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150 }
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151 knownLines[lnInFinal] = true;
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152 }
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153 }
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154 }
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155
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156 public void changed(ChangeBlock block) {
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157 added(block);
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158 }
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159
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160 public void deleted(DeleteBlock block) {
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161 }
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162
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163 private void line(int lineNumber, int firstAppearance, int changesetRevIndex) {
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164 lineRevisions[lineNumber] = changesetRevIndex;
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165 lineNumbers[lineNumber] = firstAppearance;
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166 }
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167 }