jp.sourceforge.moreemacs/src/jp/sourceforge/moreemacs/handlers/BackwardWordExecution.java

   1 package jp.sourceforge.moreemacs.handlers;
   2
   3 import jp.sourceforge.moreemacs.utils.CodePointIterator;
   4 import jp.sourceforge.moreemacs.utils.DocumentCharSequence;
   5
   6 import org.eclipse.jface.text.BadLocationException;
   7 import org.eclipse.jface.text.IDocument;
   8
   9 public final class BackwardWordExecution extends TextEditorExecution {
  10     @Override
  11     public void execute() throws BadLocationException {
  12         int current = cursor.offset();
  13         cursor.move(getPreviousWordPosition(doc, current));
  14     }
  15
  16     public static int getPreviousWordPosition(IDocument doc, int offset) throws BadLocationException {
  17         CharSequence seq = new DocumentCharSequence(doc, 0, offset);
  18         CodePointIterator itr = new CodePointIterator(seq, seq.length());
  19
  20         for(; itr.hasPrevious(); ) {
  21             if (Character.isLetterOrDigit(itr.previous())) {
  22                 itr.next();
  23                 break;
  24             }
  25         }
  26         for(; itr.hasPrevious(); ) {
  27             if (!Character.isLetterOrDigit(itr.previous())) {
  28                 itr.next();
  29                 break;
  30             }
  31         }
  32         return itr.index();
  33     }
  34 }