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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 net.sourceforge.phpdt.core.ICompilationUnit;
  14
  15 import org.eclipse.jface.text.BadLocationException;
  16 import org.eclipse.jface.text.IDocument;
  17 import org.eclipse.jface.text.templates.Template;
  18 import org.eclipse.jface.text.templates.TemplateBuffer;
  19 import org.eclipse.jface.text.templates.TemplateContextType;
  20 import org.eclipse.jface.text.templates.TemplateException;
  21 import org.eclipse.jface.text.templates.TemplateTranslator;
  22
  23 /**
  24  * A context for javadoc.
  25  */
  26 public class JavaDocContext extends CompilationUnitContext {
  27
  28         // tags
  29         private static final char HTML_TAG_BEGIN = '<';
  30
  31         private static final char HTML_TAG_END = '>';
  32
  33         private static final char JAVADOC_TAG_BEGIN = '@';
  34
  35         /**
  36          * Creates a javadoc template context.
  37          *
  38          * @param type
  39          *            the context type.
  40          * @param document
  41          *            the document.
  42          * @param completionOffset
  43          *            the completion offset within the document.
  44          * @param completionLength
  45          *            the completion length within the document.
  46          * @param compilationUnit
  47          *            the compilation unit (may be <code>null</code>).
  48          */
  49         public JavaDocContext(TemplateContextType type, IDocument document,
  50                         int completionOffset, int completionLength,
  51                         ICompilationUnit compilationUnit) {
  52                 super(type, document, completionOffset, completionLength,
  53                                 compilationUnit);
  54         }
  55
  56         /*
  57          * @see TemplateContext#canEvaluate(Template templates)
  58          */
  59         public boolean canEvaluate(Template template) {
  60                 String key = getKey();
  61
  62                 if (fForceEvaluation)
  63                         return true;
  64
  65                 return template.matches(key, getContextType().getId())
  66                                 && (key.length() != 0)
  67                                 && template.getName().toLowerCase().startsWith(
  68                                                 key.toLowerCase());
  69         }
  70
  71         /*
  72          * @see DocumentTemplateContext#getStart()
  73          */
  74         public int getStart() {
  75                 try {
  76                         IDocument document = getDocument();
  77
  78                         if (getCompletionLength() == 0) {
  79                                 int start = getCompletionOffset();
  80
  81                                 if ((start != 0)
  82                                                 && (document.getChar(start - 1) == HTML_TAG_END))
  83                                         start--;
  84
  85                                 while ((start != 0)
  86                                                 && Character.isUnicodeIdentifierPart(document
  87                                                                 .getChar(start - 1)))
  88                                         start--;
  89
  90                                 if ((start != 0)
  91                                                 && Character.isUnicodeIdentifierStart(document
  92                                                                 .getChar(start - 1)))
  93                                         start--;
  94
  95                                 // include html and javadoc tags
  96                                 if ((start != 0)
  97                                                 && ((document.getChar(start - 1) == HTML_TAG_BEGIN) || (document
  98                                                                 .getChar(start - 1) == JAVADOC_TAG_BEGIN))) {
  99                                         start--;
 100                                 }
 101
 102                                 return start;
 103
 104                         } else {
 105
 106                                 int start = getCompletionOffset();
 107                                 int end = getCompletionOffset() + getCompletionLength();
 108
 109                                 while (start != 0
 110                                                 && Character.isUnicodeIdentifierPart(document
 111                                                                 .getChar(start - 1)))
 112                                         start--;
 113
 114                                 while (start != end
 115                                                 && Character.isWhitespace(document.getChar(start)))
 116                                         start++;
 117
 118                                 if (start == end)
 119                                         start = getCompletionOffset();
 120
 121                                 return start;
 122                         }
 123
 124                 } catch (BadLocationException e) {
 125                         return getCompletionOffset();
 126                 }
 127         }
 128
 129         /*
 130          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getEnd()
 131          */
 132         public int getEnd() {
 133
 134                 if (getCompletionLength() == 0)
 135                         return super.getEnd();
 136
 137                 try {
 138                         IDocument document = getDocument();
 139
 140                         int start = getCompletionOffset();
 141                         int end = getCompletionOffset() + getCompletionLength();
 142
 143                         while (start != end
 144                                         && Character.isWhitespace(document.getChar(end - 1)))
 145                                 end--;
 146
 147                         return end;
 148
 149                 } catch (BadLocationException e) {
 150                         return super.getEnd();
 151                 }
 152         }
 153
 154         /*
 155          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getKey()
 156          */
 157         public String getKey() {
 158
 159                 if (getCompletionLength() == 0)
 160                         return super.getKey();
 161
 162                 try {
 163                         IDocument document = getDocument();
 164
 165                         int start = getStart();
 166                         int end = getCompletionOffset();
 167                         return start <= end ? document.get(start, end - start) : ""; //$NON-NLS-1$
 168
 169                 } catch (BadLocationException e) {
 170                         return super.getKey();
 171                 }
 172         }
 173
 174         /*
 175          * @see TemplateContext#evaluate(Template)
 176          */
 177         public TemplateBuffer evaluate(Template template)
 178                         throws BadLocationException, TemplateException {
 179                 TemplateTranslator translator = new TemplateTranslator();
 180                 TemplateBuffer buffer = translator.translate(template);
 181
 182                 getContextType().resolve(buffer, this);
 183
 184                 return buffer;
 185         }
 186
 187 }