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   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.corext.template.php;
  12
  13 import org.eclipse.jface.text.BadLocationException;
  14 import org.eclipse.jface.text.IDocument;
  15 import org.eclipse.jface.text.templates.TemplateContextType;
  16 import org.eclipse.jface.text.templates.Template;
  17 import org.eclipse.jface.text.templates.TemplateBuffer;
  18 import org.eclipse.jface.text.templates.TemplateException;
  19 import org.eclipse.jface.text.templates.TemplateTranslator;
  20
  21 import net.sourceforge.phpdt.core.ICompilationUnit;
  22
  23
  24 /**
  25  * A context for javadoc.
  26  */
  27 public class JavaDocContext extends CompilationUnitContext {
  28
  29         // tags
  30         private static final char HTML_TAG_BEGIN= '<';
  31         private static final char HTML_TAG_END= '>';
  32         private static final char JAVADOC_TAG_BEGIN= '@';
  33
  34         /**
  35          * Creates a javadoc template context.
  36          *
  37          * @param type   the context type.
  38          * @param document the document.
  39          * @param completionOffset the completion offset within the document.
  40          * @param completionLength the completion length within the document.
  41          * @param compilationUnit the compilation unit (may be <code>null</code>).
  42          */
  43         public JavaDocContext(TemplateContextType type, IDocument document, int completionOffset, int completionLength,
  44                 ICompilationUnit compilationUnit)
  45         {
  46                 super(type, document, completionOffset, completionLength, compilationUnit);
  47         }
  48
  49         /*
  50          * @see TemplateContext#canEvaluate(Template templates)
  51          */
  52         public boolean canEvaluate(Template template) {
  53                 String key= getKey();
  54
  55                 if (fForceEvaluation)
  56                         return true;
  57
  58                 return
  59                         template.matches(key, getContextType().getId()) &&
  60                         (key.length() != 0) && template.getName().toLowerCase().startsWith(key.toLowerCase());
  61         }
  62
  63         /*
  64          * @see DocumentTemplateContext#getStart()
  65          */
  66         public int getStart() {
  67                 try {
  68                         IDocument document= getDocument();
  69
  70                         if (getCompletionLength() == 0) {
  71                                 int start= getCompletionOffset();
  72
  73                                 if ((start != 0) && (document.getChar(start - 1) == HTML_TAG_END))
  74                                         start--;
  75
  76                                 while ((start != 0) && Character.isUnicodeIdentifierPart(document.getChar(start - 1)))
  77                                         start--;
  78
  79                                 if ((start != 0) && Character.isUnicodeIdentifierStart(document.getChar(start - 1)))
  80                                         start--;
  81
  82                                 // include html and javadoc tags
  83                                 if ((start != 0) && (
  84                                         (document.getChar(start - 1) == HTML_TAG_BEGIN) ||
  85                                         (document.getChar(start - 1) == JAVADOC_TAG_BEGIN)))
  86                                 {
  87                                         start--;
  88                                 }
  89
  90                                 return start;
  91
  92                         } else {
  93
  94                                 int start= getCompletionOffset();
  95                                 int end= getCompletionOffset() + getCompletionLength();
  96
  97                                 while (start != 0 && Character.isUnicodeIdentifierPart(document.getChar(start - 1)))
  98                                         start--;
  99
 100                                 while (start != end && Character.isWhitespace(document.getChar(start)))
 101                                         start++;
 102
 103                                 if (start == end)
 104                                         start= getCompletionOffset();
 105
 106                                 return start;
 107                         }
 108
 109                 } catch (BadLocationException e) {
 110                         return getCompletionOffset();
 111                 }
 112         }
 113
 114         /*
 115          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getEnd()
 116          */
 117         public int getEnd() {
 118
 119                 if (getCompletionLength() == 0)
 120                         return super.getEnd();
 121
 122                 try {
 123                         IDocument document= getDocument();
 124
 125                         int start= getCompletionOffset();
 126                         int end= getCompletionOffset() + getCompletionLength();
 127
 128                         while (start != end && Character.isWhitespace(document.getChar(end - 1)))
 129                                 end--;
 130
 131                         return end;
 132
 133                 } catch (BadLocationException e) {
 134                         return super.getEnd();
 135                 }
 136         }
 137
 138         /*
 139          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getKey()
 140          */
 141         public String getKey() {
 142
 143                 if (getCompletionLength() == 0)
 144                         return super.getKey();
 145
 146                 try {
 147                         IDocument document= getDocument();
 148
 149                         int start= getStart();
 150                         int end= getCompletionOffset();
 151                         return start <= end
 152                                 ? document.get(start, end - start)
 153                                 : ""; //$NON-NLS-1$
 154
 155                 } catch (BadLocationException e) {
 156                         return super.getKey();
 157                 }
 158         }
 159
 160         /*
 161          * @see TemplateContext#evaluate(Template)
 162          */
 163         public TemplateBuffer evaluate(Template template) throws BadLocationException, TemplateException {
 164                 TemplateTranslator translator= new TemplateTranslator();
 165                 TemplateBuffer buffer= translator.translate(template);
 166
 167                 getContextType().resolve(buffer, this);
 168
 169                 return buffer;
 170         }
 171
 172 }
 173