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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.ConfigurableLineTracker;
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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 dwtx.core.runtime.Assert;
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18
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19
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20 /**
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21 * Standard implementation of a generic
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22 * {@link dwtx.jface.text.ILineTracker}.
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23 * <p>
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24 * The line tracker can be configured with the set of legal line delimiters.
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25 * Line delimiters are unconstrained. The line delimiters are used to compute
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26 * the tracker's line structure. In the case of overlapping line delimiters, the
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27 * longest line delimiter is given precedence of the shorter ones.
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28 * <p>
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29 * This class is not intended to be subclassed.
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30 * </p>
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31 * @noextend This class is not intended to be subclassed by clients.
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32 */
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33 public class ConfigurableLineTracker : AbstractLineTracker {
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34
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35
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36 /** The strings which are considered being the line delimiter */
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37 private String[] fDelimiters;
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38 /** A predefined delimiter information which is always reused as return value */
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39 private DelimiterInfo fDelimiterInfo= new DelimiterInfo();
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40
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41
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42 /**
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43 * Creates a standard line tracker for the given line delimiters.
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44 *
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45 * @param legalLineDelimiters the tracker's legal line delimiters,
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46 * may not be <code>null</code> and must be longer than 0
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47 */
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48 public ConfigurableLineTracker(String[] legalLineDelimiters) {
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49 Assert.isTrue(legalLineDelimiters !is null && legalLineDelimiters.length > 0);
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50 fDelimiters= TextUtilities.copy(legalLineDelimiters);
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51 }
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52
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53 /*
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54 * @see dwtx.jface.text.ILineTracker#getLegalLineDelimiters()
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55 */
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56 public String[] getLegalLineDelimiters() {
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57 return TextUtilities.copy(fDelimiters);
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58 }
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59
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60 /*
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61 * @see dwtx.jface.text.AbstractLineTracker#nextDelimiterInfo(java.lang.String, int)
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62 */
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63 protected DelimiterInfo nextDelimiterInfo(String text, int offset) {
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64 if (fDelimiters.length > 1) {
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65 int[] info= TextUtilities.indexOf(fDelimiters, text, offset);
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66 if (info[0] is -1)
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67 return null;
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68 fDelimiterInfo.delimiterIndex= info[0];
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69 fDelimiterInfo.delimiter= fDelimiters[info[1]];
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70 } else {
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71 int index= text.indexOf(fDelimiters[0], offset);
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72 if (index is -1)
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73 return null;
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74 fDelimiterInfo.delimiterIndex= index;
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75 fDelimiterInfo.delimiter= fDelimiters[0];
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76 }
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77
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78 fDelimiterInfo.delimiterLength= fDelimiterInfo.delimiter.length();
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79 return fDelimiterInfo;
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80 }
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81 }
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