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 package org.netbeans.modules.ruby;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.Set;

 import org.jrubyparser.ast.Node;

 import org.jrubyparser.ast.ILocalVariable;

 import org.netbeans.modules.csl.api.InstantRenamer;

 import org.netbeans.modules.csl.api.OffsetRange;

 import org.netbeans.modules.csl.spi.ParserResult;

 import org.netbeans.modules.ruby.lexer.LexUtilities;

 import org.openide.util.NbBundle;

 /**

  * Handles renaming of local elements.

  */

 public class RubyRenameHandler implements InstantRenamer {

     @Override

     public boolean isRenameAllowed(ParserResult info, int caretOffset, String[] explanationRetValue) {

         Node root = AstUtilities.getRoot(info);

         if (root == null) {

             explanationRetValue[0] = NbBundle.getMessage(RubyRenameHandler.class, "NoRenameWithErrors");

             return false;

         }

         Node closest = root.getNodeAt(AstUtilities.getAstOffset(info, caretOffset));

         if (closest == null) return false;

         if (closest instanceof ILocalVariable) return true;  // All local block/method vars can be renamed

         switch (closest.getNodeType()) {

         case INSTASGNNODE: case INSTVARNODE: case CLASSVARDECLNODE: case CLASSVARNODE: case CLASSVARASGNNODE:

         case GLOBALASGNNODE: case GLOBALVARNODE: case CONSTDECLNODE: case CONSTNODE: case DEFNNODE: case DEFSNODE:

         case FCALLNODE: case CALLNODE: case VCALLNODE: case COLON2NODE: case COLON3NODE: case ALIASNODE:

         case SYMBOLNODE: // TODO - what about the string arguments in an alias node? Gotta check those

             return true;

         }

         return false;

     }

     @Override

     public Set<OffsetRange> getRenameRegions(ParserResult info, int caretOffset) {

         Node variable = AstUtilities.findNodeAtOffset(info, caretOffset);

         if (variable == null || !(variable instanceof ILocalVariable)) return Collections.emptySet();

         Set<OffsetRange> regions = new HashSet<OffsetRange>();

         for (ILocalVariable occurrence: ((ILocalVariable) variable).getOccurrences()) {

             OffsetRange range = LexUtilities.getLexerOffsets(info, 

                     AstUtilities.offsetRangeFor(occurrence.getNamePosition()));

             if (range != OffsetRange.NONE) regions.add(range);

         }

         return regions;

     }

 }