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annotate org.eclipse.jface.text/src/org/eclipse/jface/text/rules/DefaultDamagerRepairer.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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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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15 module org.eclipse.jface.text.rules.DefaultDamagerRepairer;
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17 import org.eclipse.jface.text.rules.FastPartitioner; // packageimport
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18 import org.eclipse.jface.text.rules.ITokenScanner; // packageimport
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19 import org.eclipse.jface.text.rules.Token; // packageimport
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20 import org.eclipse.jface.text.rules.RuleBasedScanner; // packageimport
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21 import org.eclipse.jface.text.rules.EndOfLineRule; // packageimport
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22 import org.eclipse.jface.text.rules.WordRule; // packageimport
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23 import org.eclipse.jface.text.rules.WhitespaceRule; // packageimport
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24 import org.eclipse.jface.text.rules.WordPatternRule; // packageimport
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25 import org.eclipse.jface.text.rules.IPredicateRule; // packageimport
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26 import org.eclipse.jface.text.rules.DefaultPartitioner; // packageimport
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27 import org.eclipse.jface.text.rules.NumberRule; // packageimport
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28 import org.eclipse.jface.text.rules.SingleLineRule; // packageimport
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29 import org.eclipse.jface.text.rules.PatternRule; // packageimport
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30 import org.eclipse.jface.text.rules.RuleBasedDamagerRepairer; // packageimport
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31 import org.eclipse.jface.text.rules.ICharacterScanner; // packageimport
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32 import org.eclipse.jface.text.rules.IRule; // packageimport
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33 import org.eclipse.jface.text.rules.IToken; // packageimport
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34 import org.eclipse.jface.text.rules.IPartitionTokenScanner; // packageimport
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35 import org.eclipse.jface.text.rules.MultiLineRule; // packageimport
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36 import org.eclipse.jface.text.rules.RuleBasedPartitioner; // packageimport
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37 import org.eclipse.jface.text.rules.RuleBasedPartitionScanner; // packageimport
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38 import org.eclipse.jface.text.rules.BufferedRuleBasedScanner; // packageimport
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39 import org.eclipse.jface.text.rules.IWhitespaceDetector; // packageimport
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40
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41 import java.lang.all;
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42 import java.util.Set;
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47
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48 import org.eclipse.swt.SWT;
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49 import org.eclipse.swt.custom.StyleRange;
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50 import org.eclipse.core.runtime.Assert;
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51 import org.eclipse.jface.text.BadLocationException;
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52 import org.eclipse.jface.text.DocumentEvent;
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53 import org.eclipse.jface.text.IDocument;
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54 import org.eclipse.jface.text.IRegion;
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55 import org.eclipse.jface.text.ITypedRegion;
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56 import org.eclipse.jface.text.Region;
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57 import org.eclipse.jface.text.TextAttribute;
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58 import org.eclipse.jface.text.TextPresentation;
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59 import org.eclipse.jface.text.presentation.IPresentationDamager;
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60 import org.eclipse.jface.text.presentation.IPresentationRepairer;
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61
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62
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63 /**
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64 * A standard implementation of a syntax driven presentation damager
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65 * and presentation repairer. It uses a token scanner to scan
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66 * the document and to determine its damage and new text presentation.
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67 * The tokens returned by the scanner are supposed to return text attributes
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68 * as their data.
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69 *
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70 * @see ITokenScanner
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71 * @since 2.0
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72 */
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73 public class DefaultDamagerRepairer : IPresentationDamager, IPresentationRepairer {
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74
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75
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76 /** The document this object works on */
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77 protected IDocument fDocument;
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78 /** The scanner it uses */
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79 protected ITokenScanner fScanner;
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80 /** The default text attribute if non is returned as data by the current token */
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81 protected TextAttribute fDefaultTextAttribute;
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82
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83 /**
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84 * Creates a damager/repairer that uses the given scanner and returns the given default
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85 * text attribute if the current token does not carry a text attribute.
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86 *
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87 * @param scanner the token scanner to be used
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88 * @param defaultTextAttribute the text attribute to be returned if non is specified by the current token,
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89 * may not be <code>null</code>
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90 *
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91 * @deprecated use DefaultDamagerRepairer(ITokenScanner) instead
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92 */
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93 public this(ITokenScanner scanner, TextAttribute defaultTextAttribute) {
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94
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95 Assert.isNotNull(defaultTextAttribute);
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96
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97 fScanner= scanner;
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98 fDefaultTextAttribute= defaultTextAttribute;
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99 }
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100
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101 /**
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102 * Creates a damager/repairer that uses the given scanner. The scanner may not be <code>null</code>
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103 * and is assumed to return only token that carry text attributes.
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104 *
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105 * @param scanner the token scanner to be used, may not be <code>null</code>
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106 */
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107 public this(ITokenScanner scanner) {
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108
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109 Assert.isNotNull(cast(Object)scanner);
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110
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111 fScanner= scanner;
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112 fDefaultTextAttribute= new TextAttribute(null);
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113 }
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114
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115 /*
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116 * @see IPresentationDamager#setDocument(IDocument)
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117 * @see IPresentationRepairer#setDocument(IDocument)
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118 */
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119 public void setDocument(IDocument document) {
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120 fDocument= document;
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121 }
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122
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123
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124 //---- IPresentationDamager
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125
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126 /**
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127 * Returns the end offset of the line that contains the specified offset or
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128 * if the offset is inside a line delimiter, the end offset of the next line.
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129 *
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130 * @param offset the offset whose line end offset must be computed
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131 * @return the line end offset for the given offset
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132 * @exception BadLocationException if offset is invalid in the current document
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133 */
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134 protected int endOfLineOf(int offset) {
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135
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136 IRegion info= fDocument.getLineInformationOfOffset(offset);
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137 if (offset <= info.getOffset() + info.getLength())
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138 return info.getOffset() + info.getLength();
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139
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140 int line= fDocument.getLineOfOffset(offset);
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141 try {
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142 info= fDocument.getLineInformation(line + 1);
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143 return info.getOffset() + info.getLength();
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144 } catch (BadLocationException x) {
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145 return fDocument.getLength();
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146 }
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147 }
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148
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149 /*
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150 * @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent, bool)
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151 */
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152 public IRegion getDamageRegion(ITypedRegion partition, DocumentEvent e, bool documentPartitioningChanged) {
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153
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154 if (!documentPartitioningChanged) {
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155 try {
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156
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157 IRegion info= fDocument.getLineInformationOfOffset(e.getOffset());
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158 int start= Math.max(partition.getOffset(), info.getOffset());
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159
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160 int end= e.getOffset() + (e.getText() is null ? e.getLength() : e.getText().length());
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161
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162 if (info.getOffset() <= end && end <= info.getOffset() + info.getLength()) {
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163 // optimize the case of the same line
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164 end= info.getOffset() + info.getLength();
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165 } else
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166 end= endOfLineOf(end);
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167
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168 end= Math.min(partition.getOffset() + partition.getLength(), end);
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169 return new Region(start, end - start);
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170
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171 } catch (BadLocationException x) {
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172 }
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173 }
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174
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175 return partition;
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176 }
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177
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178 //---- IPresentationRepairer
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179
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180 /*
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181 * @see IPresentationRepairer#createPresentation(TextPresentation, ITypedRegion)
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182 */
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183 public void createPresentation(TextPresentation presentation, ITypedRegion region) {
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184
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185 if (fScanner is null) {
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186 // will be removed if deprecated constructor will be removed
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187 addRange(presentation, region.getOffset(), region.getLength(), fDefaultTextAttribute);
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188 return;
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189 }
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190
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191 int lastStart= region.getOffset();
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192 int length= 0;
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193 bool firstToken= true;
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194 IToken lastToken= Token.UNDEFINED;
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195 TextAttribute lastAttribute= getTokenTextAttribute(lastToken);
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196
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197 fScanner.setRange(fDocument, lastStart, region.getLength());
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198
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199 while (true) {
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200 IToken token= fScanner.nextToken();
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201 if (token.isEOF())
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202 break;
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203
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204 TextAttribute attribute= getTokenTextAttribute(token);
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205 if (lastAttribute !is null && lastAttribute.equals(attribute)) {
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206 length += fScanner.getTokenLength();
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207 firstToken= false;
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208 } else {
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209 if (!firstToken)
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210 addRange(presentation, lastStart, length, lastAttribute);
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211 firstToken= false;
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212 lastToken= token;
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213 lastAttribute= attribute;
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214 lastStart= fScanner.getTokenOffset();
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215 length= fScanner.getTokenLength();
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216 }
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217 }
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218
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219 addRange(presentation, lastStart, length, lastAttribute);
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220 }
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221
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222 /**
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223 * Returns a text attribute encoded in the given token. If the token's
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224 * data is not <code>null</code> and a text attribute it is assumed that
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225 * it is the encoded text attribute. It returns the default text attribute
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226 * if there is no encoded text attribute found.
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227 *
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228 * @param token the token whose text attribute is to be determined
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229 * @return the token's text attribute
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230 */
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231 protected TextAttribute getTokenTextAttribute(IToken token) {
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232 Object data= token.getData();
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233 if ( cast(TextAttribute)data )
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234 return cast(TextAttribute) data;
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235 return fDefaultTextAttribute;
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236 }
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237
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238 /**
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239 * Adds style information to the given text presentation.
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240 *
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241 * @param presentation the text presentation to be extended
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242 * @param offset the offset of the range to be styled
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243 * @param length the length of the range to be styled
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244 * @param attr the attribute describing the style of the range to be styled
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245 */
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246 protected void addRange(TextPresentation presentation, int offset, int length, TextAttribute attr) {
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247 if (attr !is null) {
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248 int style= attr.getStyle();
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249 int fontStyle= style & (SWT.ITALIC | SWT.BOLD | SWT.NORMAL);
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250 StyleRange styleRange= new StyleRange(offset, length, attr.getForeground(), attr.getBackground(), fontStyle);
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251 styleRange.strikeout= (style & TextAttribute.STRIKETHROUGH) !is 0;
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252 styleRange.underline= (style & TextAttribute.UNDERLINE) !is 0;
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253 styleRange.font= attr.getFont();
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254 presentation.addStyleRange(styleRange);
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255 }
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256 }
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257 }
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258
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259