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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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.text.rules.WordPatternRule;
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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 import dwtx.core.runtime.Assert;
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19
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20
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21
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22 /**
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23 * A specific single line rule which stipulates that the start
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24 * and end sequence occur within a single word, as defined by a word detector.
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25 *
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26 * @see IWordDetector
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27 */
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28 public class WordPatternRule : SingleLineRule {
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29
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30 /** The word detector used by this rule */
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31 protected IWordDetector fDetector;
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32 /** The internal buffer used for pattern detection */
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33 private StringBuffer fBuffer= new StringBuffer();
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34
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35 /**
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36 * Creates a rule for the given starting and ending word
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37 * pattern which, if detected, will return the specified token.
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38 * A word detector is used to identify words.
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39 *
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40 * @param detector the word detector to be used
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41 * @param startSequence the start sequence of the word pattern
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42 * @param endSequence the end sequence of the word pattern
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43 * @param token the token to be returned on success
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44 */
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45 public WordPatternRule(IWordDetector detector, String startSequence, String endSequence, IToken token) {
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46 this(detector, startSequence, endSequence, token, (char)0);
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47 }
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48
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49 /**
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50 /**
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51 * Creates a rule for the given starting and ending word
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52 * pattern which, if detected, will return the specified token.
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53 * A word detector is used to identify words.
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54 * Any character which follows the given escapeCharacter will be ignored.
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55 *
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56 * @param detector the word detector to be used
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57 * @param startSequence the start sequence of the word pattern
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58 * @param endSequence the end sequence of the word pattern
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59 * @param token the token to be returned on success
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60 * @param escapeCharacter the escape character
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61 */
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62 public WordPatternRule(IWordDetector detector, String startSequence, String endSequence, IToken token, char escapeCharacter) {
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63 super(startSequence, endSequence, token, escapeCharacter);
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64 Assert.isNotNull(detector);
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65 fDetector= detector;
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66 }
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67
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68 /**
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69 * Returns whether the end sequence was detected.
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70 * The rule acquires the rest of the word, using the
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71 * provided word detector, and tests to determine if
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72 * it ends with the end sequence.
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73 *
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74 * @param scanner the scanner to be used
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75 * @return <code>true</code> if the word ends on the given end sequence
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76 */
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77 protected bool endSequenceDetected(ICharacterScanner scanner) {
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78 fBuffer.setLength(0);
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79 int c= scanner.read();
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80 while (fDetector.isWordPart((char) c)) {
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81 fBuffer.append((char) c);
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82 c= scanner.read();
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83 }
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84 scanner.unread();
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85
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86 if (fBuffer.length() >= fEndSequence.length) {
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87 for (int i=fEndSequence.length - 1, j= fBuffer.length() - 1; i >= 0; i--, j--) {
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88 if (fEndSequence[i] !is fBuffer.charAt(j)) {
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89 unreadBuffer(scanner);
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90 return false;
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91 }
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92 }
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93 return true;
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94 }
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95
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96 unreadBuffer(scanner);
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97 return false;
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98 }
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99
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100 /**
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101 * Returns the characters in the buffer to the scanner.
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102 * Note that the rule must also return the characters
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103 * read in as part of the start sequence expect the first one.
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104 *
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105 * @param scanner the scanner to be used
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106 */
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107 protected void unreadBuffer(ICharacterScanner scanner) {
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108 fBuffer.insert(0, fStartSequence);
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109 for (int i= fBuffer.length() - 1; i > 0; i--)
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110 scanner.unread();
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111 }
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112 }
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