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1 /*******************************************************************************
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2 * Copyright (c) 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.jface.internal.text.revisions.HunkComputer;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import java.util.ArrayList;
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18 import java.util.List;
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19
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20 import dwtx.jface.text.source.ILineDiffInfo;
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21 import dwtx.jface.text.source.ILineDiffer;
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22
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23
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24 /**
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25 * Computes the diff hunks from an {@link ILineDiffer}.
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26 *
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27 * @since 3.3
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28 */
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29 public final class HunkComputer {
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30 /**
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31 * Converts the line-based information of {@link ILineDiffer} into {@link Hunk}s, grouping
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32 * contiguous blocks of lines that are changed (added, deleted).
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33 *
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34 * @param differ the line differ to query
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35 * @param lines the number of lines to query
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36 * @return the corresponding {@link Hunk} information
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37 */
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38 public static Hunk[] computeHunks(ILineDiffer differ, int lines) {
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39 List hunks= new ArrayList(lines);
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40
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41 int added= 0;
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42 int changed= 0;
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43 ILineDiffInfo info= null;
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44 for (int line= 0; line < lines; line++) {
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45 info= differ.getLineInfo(line);
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46 if (info is null)
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47 continue;
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48
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49 int changeType= info.getChangeType();
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50 switch (changeType) {
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51 case ILineDiffInfo.ADDED:
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52 added++;
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53 continue;
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54 case ILineDiffInfo.CHANGED:
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55 changed++;
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56 continue;
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57 case ILineDiffInfo.UNCHANGED:
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58 added -= info.getRemovedLinesAbove();
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59 if (added !is 0 || changed !is 0) {
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60 hunks.add(new Hunk(line - changed - Math.max(0, added), added, changed));
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61 added= 0;
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62 changed= 0;
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63 }
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64 }
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65 }
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66
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67 // last hunk
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68 if (info !is null) {
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69 added -= info.getRemovedLinesBelow();
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70 if (added !is 0 || changed !is 0) {
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71 hunks.add(new Hunk(lines - changed, added, changed));
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72 added= 0;
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73 changed= 0;
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74 }
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75 }
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76
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77 return (Hunk[]) hunks.toArray(new Hunk[hunks.size()]);
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78 }
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79 private HunkComputer() {
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80 }
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81 }
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