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annotate org.eclipse.jface.text/src/org/eclipse/jface/text/templates/TemplateCompletionProcessor.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, 2005 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 org.eclipse.jface.text.templates.TemplateCompletionProcessor;
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15 import org.eclipse.jface.text.templates.SimpleTemplateVariableResolver; // packageimport
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16 import org.eclipse.jface.text.templates.TemplateBuffer; // packageimport
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17 import org.eclipse.jface.text.templates.TemplateContext; // packageimport
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18 import org.eclipse.jface.text.templates.TemplateContextType; // packageimport
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19 import org.eclipse.jface.text.templates.Template; // packageimport
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20 import org.eclipse.jface.text.templates.TemplateVariable; // packageimport
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21 import org.eclipse.jface.text.templates.PositionBasedCompletionProposal; // packageimport
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22 import org.eclipse.jface.text.templates.TemplateException; // packageimport
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23 import org.eclipse.jface.text.templates.TemplateTranslator; // packageimport
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24 import org.eclipse.jface.text.templates.DocumentTemplateContext; // packageimport
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25 import org.eclipse.jface.text.templates.GlobalTemplateVariables; // packageimport
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26 import org.eclipse.jface.text.templates.InclusivePositionUpdater; // packageimport
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27 import org.eclipse.jface.text.templates.TemplateProposal; // packageimport
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28 import org.eclipse.jface.text.templates.ContextTypeRegistry; // packageimport
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29 import org.eclipse.jface.text.templates.JFaceTextTemplateMessages; // packageimport
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30 import org.eclipse.jface.text.templates.TextTemplateMessages; // packageimport
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31 import org.eclipse.jface.text.templates.TemplateVariableType; // packageimport
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32 import org.eclipse.jface.text.templates.TemplateVariableResolver; // packageimport
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35 import java.lang.all;
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36 import java.util.Collections;
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37 import java.util.List;
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38 import java.util.ArrayList;
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39 import java.util.Set;
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44
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45 import org.eclipse.swt.graphics.Image;
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46 import org.eclipse.jface.text.BadLocationException;
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47 import org.eclipse.jface.text.IDocument;
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48 import org.eclipse.jface.text.IRegion;
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49 import org.eclipse.jface.text.ITextSelection;
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50 import org.eclipse.jface.text.ITextViewer;
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51 import org.eclipse.jface.text.Region;
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52 import org.eclipse.jface.text.contentassist.ICompletionProposal;
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53 import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
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54 import org.eclipse.jface.text.contentassist.IContextInformation;
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55 import org.eclipse.jface.text.contentassist.IContextInformationValidator;
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57
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58 /**
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59 * A completion processor that computes template proposals. Subclasses need to
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60 * provide implementations for {@link #getTemplates(String)},
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61 * {@link #getContextType(ITextViewer, IRegion)} and {@link #getImage(Template)}.
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62 *
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63 * @since 3.0
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64 */
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65 public abstract class TemplateCompletionProcessor : IContentAssistProcessor {
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66
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67 private static final class ProposalComparator : Comparator {
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68 public int compare(Object o1, Object o2) {
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69 return (cast(TemplateProposal) o2).getRelevance() - (cast(TemplateProposal) o1).getRelevance();
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70 }
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71 }
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72
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73 private static Comparator fgProposalComparator_;
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74 private static Comparator fgProposalComparator(){
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75 if(fgProposalComparator_ is null ) {
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76 synchronized( TemplateCompletionProcessor.classinfo ){
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77 if(fgProposalComparator_ is null ) {
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78 fgProposalComparator_ = new ProposalComparator();
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79 }
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80 }
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81 }
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82 return fgProposalComparator_;
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83 }
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84
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85 /*
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86 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeCompletionProposals(org.eclipse.jface.text.ITextViewer,
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87 * int)
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88 */
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89 public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
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90
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91 ITextSelection selection= cast(ITextSelection) viewer.getSelectionProvider().getSelection();
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92
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93 // adjust offset to end of normalized selection
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94 if (selection.getOffset() is offset)
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95 offset= selection.getOffset() + selection.getLength();
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96
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97 String prefix= extractPrefix(viewer, offset);
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98 Region region= new Region(offset - prefix.length(), prefix.length());
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99 TemplateContext context= createContext(viewer, region);
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100 if (context is null)
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101 return new ICompletionProposal[0];
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102
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103 context.setVariable("selection", selection.getText()); // name of the selection variables {line, word}_selection //$NON-NLS-1$
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104
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105 Template[] templates= getTemplates(context.getContextType().getId());
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106
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107 List matches= new ArrayList();
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108 for (int i= 0; i < templates.length; i++) {
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109 Template template_= templates[i];
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110 try {
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111 context.getContextType().validate(template_.getPattern());
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112 } catch (TemplateException e) {
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113 continue;
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114 }
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115 if (template_.matches(prefix, context.getContextType().getId()))
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116 matches.add( cast(Object) createProposal(template_, context, cast(IRegion) region, getRelevance(template_, prefix)));
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117 }
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118
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119 Collections.sort(matches, fgProposalComparator);
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120
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121 return arraycast!(ICompletionProposal)( matches.toArray());
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122 }
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123
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124 /**
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125 * Creates a new proposal.
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126 * <p>
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127 * Forwards to {@link #createProposal(Template, TemplateContext, IRegion, int)}.
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128 * Do neither call nor override.
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129 * </p>
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130 *
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131 * @param template the template to be applied by the proposal
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132 * @param context the context for the proposal
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133 * @param region the region the proposal applies to
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134 * @param relevance the relevance of the proposal
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135 * @return a new <code>ICompletionProposal</code> for
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136 * <code>template</code>
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137 * @deprecated use the version specifying <code>IRegion</code> as third parameter
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138 * @since 3.1
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139 */
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140 protected ICompletionProposal createProposal(Template template_, TemplateContext context, Region region, int relevance) {
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141 return createProposal(template_, context, cast(IRegion) region, relevance);
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142 }
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143
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144 /**
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145 * Creates a new proposal.
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146 * <p>
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147 * The default implementation returns an instance of
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148 * {@link TemplateProposal}. Subclasses may replace this method to provide
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149 * their own implementations.
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150 * </p>
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151 *
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152 * @param template the template to be applied by the proposal
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153 * @param context the context for the proposal
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154 * @param region the region the proposal applies to
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155 * @param relevance the relevance of the proposal
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156 * @return a new <code>ICompletionProposal</code> for
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157 * <code>template</code>
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158 */
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159 protected ICompletionProposal createProposal(Template template_, TemplateContext context, IRegion region, int relevance) {
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160 return new TemplateProposal(template_, context, region, getImage(template_), relevance);
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161 }
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162
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163 /**
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164 * Returns the templates valid for the context type specified by <code>contextTypeId</code>.
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165 *
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166 * @param contextTypeId the context type id
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167 * @return the templates valid for this context type id
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168 */
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169 protected abstract Template[] getTemplates(String contextTypeId);
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170
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171 /**
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172 * Creates a concrete template context for the given region in the document. This involves finding out which
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173 * context type is valid at the given location, and then creating a context of this type. The default implementation
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174 * returns a <code>DocumentTemplateContext</code> for the context type at the given location.
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175 *
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176 * @param viewer the viewer for which the context is created
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177 * @param region the region into <code>document</code> for which the context is created
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178 * @return a template context that can handle template insertion at the given location, or <code>null</code>
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179 */
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180 protected TemplateContext createContext(ITextViewer viewer, IRegion region) {
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181 TemplateContextType contextType= getContextType(viewer, region);
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182 if (contextType !is null) {
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183 IDocument document= viewer.getDocument();
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184 return new DocumentTemplateContext(contextType, document, region.getOffset(), region.getLength());
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185 }
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186 return null;
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187 }
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188
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189 /**
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190 * Returns the context type that can handle template insertion at the given region
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191 * in the viewer's document.
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192 *
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193 * @param viewer the text viewer
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194 * @param region the region into the document displayed by viewer
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195 * @return the context type that can handle template expansion for the given location, or <code>null</code> if none exists
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196 */
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197 protected abstract TemplateContextType getContextType(ITextViewer viewer, IRegion region);
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198
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199 /**
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200 * Returns the relevance of a template given a prefix. The default
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201 * implementation returns a number greater than zero if the template name
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202 * starts with the prefix, and zero otherwise.
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203 *
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204 * @param template the template to compute the relevance for
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205 * @param prefix the prefix after which content assist was requested
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206 * @return the relevance of <code>template</code>
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207 * @see #extractPrefix(ITextViewer, int)
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208 */
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209 protected int getRelevance(Template template_, String prefix) {
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210 if (template_.getName().startsWith(prefix))
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211 return 90;
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212 return 0;
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213 }
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214
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215 /**
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216 * Heuristically extracts the prefix used for determining template relevance
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217 * from the viewer's document. The default implementation returns the String from
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218 * offset backwards that forms a java identifier.
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219 *
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220 * @param viewer the viewer
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221 * @param offset offset into document
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222 * @return the prefix to consider
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223 * @see #getRelevance(Template, String)
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224 */
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225 protected String extractPrefix(ITextViewer viewer, int offset) {
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226 int i= offset;
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227 IDocument document= viewer.getDocument();
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228 if (i > document.getLength())
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229 return ""; //$NON-NLS-1$
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230
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231 try {
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232 while (i > 0) {
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233 char ch= document.getChar(i - 1);
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234 if (!Character.isJavaIdentifierPart(ch))
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235 break;
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236 i--;
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237 }
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238
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239 return document.get(i, offset - i);
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240 } catch (BadLocationException e) {
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241 return ""; //$NON-NLS-1$
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242 }
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243 }
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244
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245 /**
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246 * Returns the image to be used for the proposal for <code>template</code>.
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247 *
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248 * @param template the template for which an image should be returned
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249 * @return the image for <code>template</code>
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250 */
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251 protected abstract Image getImage(Template template_);
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252
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253 /*
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254 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeContextInformation(org.eclipse.jface.text.ITextViewer, int)
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255 */
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256 public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
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257 return null;
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258 }
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259
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260 /*
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261 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
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262 */
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263 public char[] getCompletionProposalAutoActivationCharacters() {
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264 return null;
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265 }
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266
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267 /*
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268 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationAutoActivationCharacters()
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269 */
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270 public char[] getContextInformationAutoActivationCharacters() {
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271 return null;
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272 }
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273
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274 /*
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275 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getErrorMessage()
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276 */
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277 public String getErrorMessage() {
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278 return null;
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279 }
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280
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281 /*
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282 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationValidator()
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283 */
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284 public IContextInformationValidator getContextInformationValidator() {
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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285 return null;
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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286 }
bc29606a740c Added dwt-addons in original directory structure of eclipse.org
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287 }