net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/corext/template/php/HTMLUnitContext.java

   1 package net.sourceforge.phpdt.internal.corext.template.php;
   2
   3 import net.sourceforge.phpdt.core.ICompilationUnit;
   4
   5 import org.eclipse.jface.text.BadLocationException;
   6 import org.eclipse.jface.text.IDocument;
   7 import org.eclipse.jface.text.templates.Template;
   8 import org.eclipse.jface.text.templates.TemplateBuffer;
   9 import org.eclipse.jface.text.templates.TemplateContextType;
  10 import org.eclipse.jface.text.templates.TemplateException;
  11 import org.eclipse.jface.text.templates.TemplateTranslator;
  12
  13 /**
  14  * A context for javadoc.
  15  */
  16 public class HTMLUnitContext extends CompilationUnitContext {
  17
  18         // tags
  19         // private static final char HTML_TAG_BEGIN= '<';
  20         // private static final char HTML_TAG_END= '>';
  21         // private static final char JAVADOC_TAG_BEGIN= '@';
  22         /**
  23          * special characters '&' for the start of HTML entities '<' for the start
  24          * of HTML tags '#' for the start of colour attributes '{' for the start of
  25          * smarty partitions inside HTML code
  26          */
  27         private static final String specialChars = "&<#{";
  28
  29         /**
  30          * Creates a javadoc template context.
  31          *
  32          * @param type
  33          *            the context type.
  34          * @param document
  35          *            the document.
  36          * @param completionOffset
  37          *            the completion offset within the document.
  38          * @param completionLength
  39          *            the completion length within the document.
  40          * @param compilationUnit
  41          *            the compilation unit (may be <code>null</code>).
  42          */
  43         public HTMLUnitContext(TemplateContextType type, IDocument document,
  44                         int completionOffset, int completionLength,
  45                         ICompilationUnit compilationUnit) {
  46                 super(type, document, completionOffset, completionLength,
  47                                 compilationUnit);
  48         }
  49
  50         /*
  51          * @see TemplateContext#canEvaluate(Template templates)
  52          */
  53         public boolean canEvaluate(Template template) {
  54                 String key = getKey();
  55
  56                 if (fForceEvaluation)
  57                         return true;
  58
  59                 return template.matches(key, getContextType().getId())
  60                                 && (key.length() != 0)
  61                                 && template.getName().toLowerCase().startsWith(
  62                                                 key.toLowerCase());
  63         }
  64
  65         /*
  66          * @see DocumentTemplateContext#getCompletionPosition();
  67          */
  68         public int getStart() {
  69                 IDocument document = getDocument();
  70                 try {
  71                         int start = getCompletionOffset();
  72                         char ch = ' ';
  73                         while (start != 0) {
  74                                 ch = document.getChar(start - 1);
  75                                 if (specialChars.indexOf(ch) != (-1)) {
  76                                         return --start;
  77                                 }
  78                                 if (Character.isUnicodeIdentifierPart(ch)) {
  79                                         start--;
  80                                 } else {
  81                                         break;
  82                                 }
  83                         }
  84                         if ((start != 0)
  85                                         && Character.isUnicodeIdentifierStart(document
  86                                                         .getChar(start - 1))) {
  87                                 start--;
  88                                 if ((start != 0)
  89                                                 && specialChars.indexOf(document.getChar(start - 1)) != (-1)) {
  90                                         start--;
  91                                 }
  92                         }
  93
  94                         // while (((start != 0)
  95                         // && Character.isUnicodeIdentifierPart(document.getChar(start -
  96                         // 1)))
  97                         // || ((start != 0)
  98                         // && specialChars.indexOf(document.getChar(start - 1)) != (-1))) {
  99                         // start--;
 100                         // }
 101                         //
 102                         // if (((start != 0)
 103                         // && Character.isUnicodeIdentifierStart(document.getChar(start -
 104                         // 1)))
 105                         // || ((start != 0)
 106                         // && specialChars.indexOf(document.getChar(start - 1)) != (-1))) {
 107                         // start--;
 108                         // }
 109
 110                         return start;
 111
 112                 } catch (BadLocationException e) {
 113                         return getCompletionOffset();
 114                 }
 115         }
 116
 117         /*
 118          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getEnd()
 119          */
 120         public int getEnd() {
 121
 122                 if (getCompletionLength() == 0)
 123                         return super.getEnd();
 124
 125                 try {
 126                         IDocument document = getDocument();
 127
 128                         int start = getCompletionOffset();
 129                         int end = getCompletionOffset() + getCompletionLength();
 130
 131                         while (start != end
 132                                         && Character.isWhitespace(document.getChar(end - 1)))
 133                                 end--;
 134
 135                         return end;
 136
 137                 } catch (BadLocationException e) {
 138                         return super.getEnd();
 139                 }
 140         }
 141
 142         /*
 143          * @see net.sourceforge.phpdt.internal.corext.template.DocumentTemplateContext#getKey()
 144          */
 145         public String getKey() {
 146
 147                 if (getCompletionLength() == 0)
 148                         return super.getKey();
 149
 150                 try {
 151                         IDocument document = getDocument();
 152
 153                         int start = getStart();
 154                         int end = getCompletionOffset();
 155                         return start <= end ? document.get(start, end - start) : ""; //$NON-NLS-1$
 156
 157                 } catch (BadLocationException e) {
 158                         return super.getKey();
 159                 }
 160         }
 161
 162         /*
 163          * @see TemplateContext#evaluate(Template)
 164          */
 165         public TemplateBuffer evaluate(Template template)
 166                         throws BadLocationException, TemplateException {
 167                 TemplateTranslator translator = new TemplateTranslator();
 168                 TemplateBuffer buffer = translator.translate(template);
 169
 170                 getContextType().resolve(buffer, this);
 171
 172                 return buffer;
 173         }
 174
 175 }