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

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