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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.text.DefaultLineTracker;
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14
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15 import dwt.dwthelper.utils;
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16
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17
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18 /**
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19 * Standard implementation of {@link dwtx.jface.text.ILineTracker}.
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20 * <p>
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21 * The line tracker considers the three common line delimiters which are '\n',
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22 * '\r', '\r\n'.
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23 * <p>
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24 * This class is not intended to be subclassed.
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25 * </p>
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26 * @noextend This class is not intended to be subclassed by clients.
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27 */
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28 public class DefaultLineTracker : AbstractLineTracker {
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29
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30 /** The predefined delimiters of this tracker */
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31 public final static String[] DELIMITERS= { "\r", "\n", "\r\n" }; //$NON-NLS-3$ //$NON-NLS-1$ //$NON-NLS-2$
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32 /** A predefined delimiter information which is always reused as return value */
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33 private DelimiterInfo fDelimiterInfo= new DelimiterInfo();
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34
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35
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36 /**
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37 * Creates a standard line tracker.
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38 */
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39 public DefaultLineTracker() {
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40 }
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41
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42 /*
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43 * @see dwtx.jface.text.ILineTracker#getLegalLineDelimiters()
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44 */
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45 public String[] getLegalLineDelimiters() {
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46 return TextUtilities.copy(DELIMITERS);
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47 }
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48
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49 /*
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50 * @see dwtx.jface.text.AbstractLineTracker#nextDelimiterInfo(java.lang.String, int)
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51 */
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52 protected DelimiterInfo nextDelimiterInfo(String text, int offset) {
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53
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54 char ch;
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55 int length= text.length();
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56 for (int i= offset; i < length; i++) {
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57
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58 ch= text.charAt(i);
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59 if (ch is '\r') {
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60
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61 if (i + 1 < length) {
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62 if (text.charAt(i + 1) is '\n') {
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63 fDelimiterInfo.delimiter= DELIMITERS[2];
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64 fDelimiterInfo.delimiterIndex= i;
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65 fDelimiterInfo.delimiterLength= 2;
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66 return fDelimiterInfo;
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67 }
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68 }
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69
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70 fDelimiterInfo.delimiter= DELIMITERS[0];
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71 fDelimiterInfo.delimiterIndex= i;
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72 fDelimiterInfo.delimiterLength= 1;
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73 return fDelimiterInfo;
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74
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75 } else if (ch is '\n') {
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76
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77 fDelimiterInfo.delimiter= DELIMITERS[1];
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78 fDelimiterInfo.delimiterIndex= i;
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79 fDelimiterInfo.delimiterLength= 1;
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80 return fDelimiterInfo;
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81 }
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82 }
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83
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84 return null;
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85 }
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86 }
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