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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;

 /**

  * Handle renaming of local elements

  * @todo I should be able to rename top-level methods as well since they

  *   are private

  * @todo Rename |j| in the following will only rename "j" inside the block!

  * <pre>

 i = 50

 j = 200

 k = 100

 x = [1,2,3]

 x.each do |j|

   puts j

 end

 puts j

  * </pre>

  * @todo When you fix, make sure BlockarReuse is also fixed!

  * @todo Try renaming "hello" in the exception here; my code is confused

  *   about what I'm renaming (aliases method name) and the refactoring dialog

  *   name is wrong! This is happening because it's also changing GlobalAsgnNode for $!

  *   but its parent is LocalAsgnNode, and -its- -grand- parent is a RescueBodyNode! 

  *   I should special case this!

  * <pre>

 def hello

   begin

     ex = 50

     puts "test"

   rescue Exception => hello

     puts hello

   end

 end

  *

  * </pre>

  *

  * @author Tor Norbye

  */

 public class RubyRenameHandler implements InstantRenamer {

     public RubyRenameHandler() {

     }

     @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 closest = AstUtilities.findNodeAtOffset(info, caretOffset);

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

         ILocalVariable variable = (ILocalVariable) closest;

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

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

             OffsetRange range = LexUtilities.getLexerOffsets(info, 

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

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

         }

         return regions;

     }

     // TODO: Check

     //  quick tip renaming

     //  unused detection

     //  occurrences marking

     //  code completion

     //  live code templates

     // ...anyone else who calls findBlock

     //

     // Test both parent blocks, sibling blocks and descendant blocks

     // Make sure the "isUsed" detection is smarter too.

 }