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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
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131
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14
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151
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15 module dwtx.jface.text.rules.RuleBasedPartitionScanner;
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16
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131
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17 import dwtx.jface.text.rules.FastPartitioner; // packageimport
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18 import dwtx.jface.text.rules.ITokenScanner; // packageimport
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19 import dwtx.jface.text.rules.Token; // packageimport
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20 import dwtx.jface.text.rules.RuleBasedScanner; // packageimport
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21 import dwtx.jface.text.rules.EndOfLineRule; // packageimport
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22 import dwtx.jface.text.rules.WordRule; // packageimport
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23 import dwtx.jface.text.rules.WhitespaceRule; // packageimport
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24 import dwtx.jface.text.rules.WordPatternRule; // packageimport
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25 import dwtx.jface.text.rules.IPredicateRule; // packageimport
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26 import dwtx.jface.text.rules.DefaultPartitioner; // packageimport
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27 import dwtx.jface.text.rules.NumberRule; // packageimport
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28 import dwtx.jface.text.rules.SingleLineRule; // packageimport
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29 import dwtx.jface.text.rules.PatternRule; // packageimport
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30 import dwtx.jface.text.rules.IWordDetector; // packageimport
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31 import dwtx.jface.text.rules.RuleBasedDamagerRepairer; // packageimport
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32 import dwtx.jface.text.rules.ICharacterScanner; // packageimport
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33 import dwtx.jface.text.rules.IRule; // packageimport
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34 import dwtx.jface.text.rules.DefaultDamagerRepairer; // packageimport
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35 import dwtx.jface.text.rules.IToken; // packageimport
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36 import dwtx.jface.text.rules.IPartitionTokenScanner; // packageimport
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37 import dwtx.jface.text.rules.MultiLineRule; // packageimport
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38 import dwtx.jface.text.rules.RuleBasedPartitioner; // packageimport
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39 import dwtx.jface.text.rules.BufferedRuleBasedScanner; // packageimport
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40 import dwtx.jface.text.rules.IWhitespaceDetector; // packageimport
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41
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129
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42 import dwt.dwthelper.utils;
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43
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44
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45 import dwtx.jface.text.IDocument;
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46
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47
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48 /**
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49 * Scanner that exclusively uses predicate rules.
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50 * @since 2.0
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51 */
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52 public class RuleBasedPartitionScanner : BufferedRuleBasedScanner , IPartitionTokenScanner {
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53
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54 /** The content type of the partition in which to resume scanning. */
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55 protected String fContentType;
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56 /** The offset of the partition inside which to resume. */
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57 protected int fPartitionOffset;
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58
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59
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60 /**
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61 * Disallow setting the rules since this scanner
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62 * exclusively uses predicate rules.
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63 *
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64 * @param rules the sequence of rules controlling this scanner
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65 */
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66 public void setRules(IRule[] rules) {
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67 throw new UnsupportedOperationException();
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68 }
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69
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70 /*
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71 * @see RuleBasedScanner#setRules(IRule[])
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72 */
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73 public void setPredicateRules(IPredicateRule[] rules) {
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74 super.setRules(rules);
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75 }
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76
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77 /*
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78 * @see ITokenScanner#setRange(IDocument, int, int)
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79 */
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80 public void setRange(IDocument document, int offset, int length) {
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81 setPartialRange(document, offset, length, null, -1);
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82 }
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83
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84 /*
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85 * @see IPartitionTokenScanner#setPartialRange(IDocument, int, int, String, int)
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86 */
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87 public void setPartialRange(IDocument document, int offset, int length, String contentType, int partitionOffset) {
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88 fContentType= contentType;
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89 fPartitionOffset= partitionOffset;
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90 if (partitionOffset > -1) {
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91 int delta= offset - partitionOffset;
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92 if (delta > 0) {
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93 super.setRange(document, partitionOffset, length + delta);
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94 fOffset= offset;
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95 return;
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96 }
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97 }
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98 super.setRange(document, offset, length);
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99 }
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100
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101 /*
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102 * @see ITokenScanner#nextToken()
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103 */
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104 public IToken nextToken() {
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105
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106
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107 if (fContentType is null || fRules is null) {
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108 //don't try to resume
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109 return super.nextToken();
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110 }
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111
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112 // inside a partition
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113
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114 fColumn= UNDEFINED;
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115 bool resume= (fPartitionOffset > -1 && fPartitionOffset < fOffset);
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116 fTokenOffset= resume ? fPartitionOffset : fOffset;
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117
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118 IPredicateRule rule;
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119 IToken token;
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120
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121 for (int i= 0; i < fRules.length; i++) {
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134
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122 rule= cast(IPredicateRule) fRules[i];
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129
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123 token= rule.getSuccessToken();
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124 if (fContentType.equals(token.getData())) {
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125 token= rule.evaluate(this, resume);
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126 if (!token.isUndefined()) {
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127 fContentType= null;
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128 return token;
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129 }
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130 }
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131 }
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132
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133 // haven't found any rule for this type of partition
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134 fContentType= null;
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135 if (resume)
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136 fOffset= fPartitionOffset;
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137 return super.nextToken();
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138 }
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139 }
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