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1 /*******************************************************************************
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2 * Copyright (c) 2007 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.TabsToSpacesConverter;
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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 * Auto edit strategy that converts tabs into spaces.
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20 * <p>
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21 * Clients usually instantiate and configure this class but
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22 * can also extend it in their own subclass.
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23 * </p>
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24 *
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25 * @since 3.3
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26 */
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27 public class TabsToSpacesConverter : IAutoEditStrategy {
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28
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29 private int fTabRatio;
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30 private ILineTracker fLineTracker;
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31
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32
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33 public void setNumberOfSpacesPerTab(int ratio) {
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34 fTabRatio= ratio;
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35 }
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36
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37 public void setLineTracker(ILineTracker lineTracker) {
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38 fLineTracker= lineTracker;
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39 }
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40
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41 private int insertTabString(StringBuffer buffer, int offsetInLine) {
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42
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43 if (fTabRatio is 0)
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44 return 0;
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45
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46 int remainder= offsetInLine % fTabRatio;
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47 remainder= fTabRatio - remainder;
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48 for (int i= 0; i < remainder; i++)
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49 buffer.append(' ');
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50 return remainder;
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51 }
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52
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53 public void customizeDocumentCommand(IDocument document, DocumentCommand command) {
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54 String text= command.text;
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55 if (text is null)
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56 return;
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57
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58 int index= text.indexOf('\t');
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59 if (index > -1) {
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60
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61 StringBuffer buffer= new StringBuffer();
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62
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63 fLineTracker.set(command.text);
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64 int lines= fLineTracker.getNumberOfLines();
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65
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66 try {
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67
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68 for (int i= 0; i < lines; i++) {
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69
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70 int offset= fLineTracker.getLineOffset(i);
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71 int endOffset= offset + fLineTracker.getLineLength(i);
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72 String line= text.substring(offset, endOffset);
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73
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74 int position= 0;
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75 if (i is 0) {
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76 IRegion firstLine= document.getLineInformationOfOffset(command.offset);
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77 position= command.offset - firstLine.getOffset();
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78 }
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79
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80 int length= line.length();
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81 for (int j= 0; j < length; j++) {
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82 char c= line.charAt(j);
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83 if (c is '\t') {
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84 position += insertTabString(buffer, position);
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85 } else {
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86 buffer.append(c);
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87 ++ position;
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88 }
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89 }
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90
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91 }
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92
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93 command.text= buffer.toString();
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94
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95 } catch (BadLocationException x) {
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96 }
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97 }
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98 }
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99 }
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