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  * The Original Software is NetBeans. The Initial Developer of the Original

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 package org.netbeans.modules.ruby;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.LinkedList;

 import java.util.List;

 import java.util.Map;

 import java.util.Set;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.swing.text.BadLocationException;

 import javax.swing.text.Document;

 import org.jrubyparser.ast.AliasNode;

 import org.jrubyparser.ast.ArgsCatNode;

 import org.jrubyparser.ast.ArgsNode;

 import org.jrubyparser.ast.ArgumentNode;

 import org.jrubyparser.ast.AssignableNode;

 import org.jrubyparser.ast.CallNode;

 import org.jrubyparser.ast.ClassNode;

 import org.jrubyparser.ast.Colon2Node;

 import org.jrubyparser.ast.Colon3Node;

 import org.jrubyparser.ast.ConstNode;

 import org.jrubyparser.ast.FCallNode;

 import org.jrubyparser.ast.IScopingNode;

 import org.jrubyparser.ast.ListNode;

 import org.jrubyparser.ast.MethodDefNode;

 import org.jrubyparser.ast.ModuleNode;

 import org.jrubyparser.ast.Node;

 import org.jrubyparser.ast.NodeType;

 import org.jrubyparser.ast.SClassNode;

 import org.jrubyparser.ast.StrNode;

 import org.jrubyparser.ast.SymbolNode;

 import org.jrubyparser.ast.VCallNode;

 import org.jrubyparser.ast.INameNode;

 import org.jrubyparser.SourcePosition;

 import org.jrubyparser.ast.AndNode;

 import org.jrubyparser.ast.AttrAssignNode;

 import org.jrubyparser.ast.CaseNode;

 import org.jrubyparser.ast.DSymbolNode;

 import org.jrubyparser.ast.DefinedNode;

 import org.jrubyparser.ast.DotNode;

 import org.jrubyparser.ast.HashNode;

 import org.jrubyparser.ast.IArgumentNode;

 import org.jrubyparser.ast.ILiteralNode;

 import org.jrubyparser.ast.ILocalScope;

 import org.jrubyparser.ast.IfNode;

 import org.jrubyparser.ast.IterNode;

 import org.jrubyparser.ast.LiteralNode;

 import org.jrubyparser.ast.NewlineNode;

 import org.jrubyparser.ast.NilNode;

 import org.jrubyparser.ast.NotNode;

 import org.jrubyparser.ast.OrNode;

 import org.jrubyparser.ast.RescueNode;

 import org.jrubyparser.ast.ReturnNode;

 import org.jrubyparser.ast.UntilNode;

 import org.jrubyparser.ast.WhenNode;

 import org.netbeans.editor.BaseDocument;

 import org.netbeans.editor.Utilities;

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

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

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

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

 import org.netbeans.modules.parsing.api.ParserManager;

 import org.netbeans.modules.parsing.api.ResultIterator;

 import org.netbeans.modules.parsing.api.Snapshot;

 import org.netbeans.modules.parsing.api.Source;

 import org.netbeans.modules.parsing.api.UserTask;

 import org.netbeans.modules.parsing.spi.ParseException;

 import org.netbeans.modules.parsing.spi.Parser;

 import org.netbeans.modules.parsing.spi.indexing.support.QuerySupport;

 import org.netbeans.modules.ruby.elements.IndexedElement;

 import org.netbeans.modules.ruby.elements.IndexedField;

 import org.netbeans.modules.ruby.elements.IndexedMethod;

 import org.openide.filesystems.FileObject;

 import org.openide.util.Exceptions;

 /**

  * Various utilities for operating on the JRuby ASTs that are used

  * elsewhere.

  * 

  * @todo Rewrite many of the custom recursion routines to simply 

  *  call {@link addNodesByType} and then iterate (without recursion) over

  *  the result set.

  *

  * @author Tor Norbye

  */

 public class AstUtilities {

     private static final Logger LOGGER = Logger.getLogger(AstUtilities.class.getName());

     private static final String[] ATTR_ACCESSORS = {"attr", "attr_reader", "attr_accessor", "attr_writer",

         "attr_internal", "attr_internal_accessor", "attr_internal_reader", "attr_internal_writer"};

     /** ActiveSupport extensions */

     private static final String[] CATTR_ACCESSORS = {"cattr_reader", "cattr_accessor", "cattr_writer"};

     /** The names of AR scope methods - named_scope in rails 2.x, rails 3.x deprecates it

      in favor of 'scope' */

     private static final String[] NAMED_SCOPE = {"named_scope", "scope"};

     /**

      * Tries to cast the given <code>result</code> to <code>RubyParseResult</code> 

      * and returns it. Returns <code>null</code> if it wasn't an instance of <code>RubyParseResult</code>.

      * 

      * @param result

      * @return

      */

     public static RubyParseResult getParseResult(Parser.Result result) {

         if (!(result instanceof RubyParseResult)) {

             LOGGER.log(Level.WARNING, "Expected RubyParseResult, but have {0}", result);

             return null;

         }

         return (RubyParseResult) result;

     }

     public static int getAstOffset(Parser.Result info, int lexOffset) {

         RubyParseResult result = getParseResult(info);

         if (result == null) return lexOffset;

         return result.getSnapshot().getEmbeddedOffset(lexOffset);

     }

     public static OffsetRange getAstOffsets(Parser.Result info, OffsetRange lexicalRange) {

         RubyParseResult result = getParseResult(info);

         if (result == null) return lexicalRange;

         int rangeStart = lexicalRange.getStart();

         int start = result.getSnapshot().getEmbeddedOffset(rangeStart);

         if (start == rangeStart) return lexicalRange;

         if (start == -1) return OffsetRange.NONE;

         // Assumes the translated range maintains size

         return new OffsetRange(start, start + lexicalRange.getLength());

     }

     /** This is a utility class only, not instantiatiable */

     private AstUtilities() {

     }

     /**

      * Get the rdoc documentation associated with the given node in the given document.

      * The node must have position information that matches the source in the document.

      */

     public static List<String> gatherDocumentation(Snapshot baseDoc, Node node) {

         LinkedList<String> comments = new LinkedList<String>();

         int elementBegin = node.getPosition().getStartOffset();

         try {

             if (elementBegin < 0 || elementBegin >= baseDoc.getText().length()) return null;

             // Search to previous lines, locate comments. Once we have a non-whitespace line that isn't

             // a comment, we're done

             int offset = GsfUtilities.getRowStart(baseDoc.getText(), elementBegin);

             offset--;

             // Skip empty and whitespace lines

             while (offset >= 0) {

                 // Find beginning of line

                 offset = GsfUtilities.getRowStart(baseDoc.getText(), offset);

                 if (!GsfUtilities.isRowEmpty(baseDoc.getText(), offset) &&

                         !GsfUtilities.isRowWhite(baseDoc.getText(), offset)) {

                     break;

                 }

                 offset--;

             }

             if (offset < 0) {

                 return null;

             }

             while (offset >= 0) {

                 // Find beginning of line

                 offset = GsfUtilities.getRowStart(baseDoc.getText(), offset);

                 if (GsfUtilities.isRowEmpty(baseDoc.getText(), offset) || GsfUtilities.isRowWhite(baseDoc.getText(), offset)) {

                     // Empty lines not allowed within an rdoc

                     break;

                 }

                 // This is a comment line we should include

                 int lineBegin = GsfUtilities.getRowFirstNonWhite(baseDoc.getText(), offset);

                 int lineEnd = GsfUtilities.getRowLastNonWhite(baseDoc.getText(), offset) + 1;

                 String line = baseDoc.getText().subSequence(lineBegin, lineEnd).toString();

                 // Tolerate "public", "private" and "protected" here --

                 // Test::Unit::Assertions likes to put these in front of each

                 // method.

                 if (line.startsWith("#")) {

                     comments.addFirst(line);

                 } else if ((comments.size() == 0) && line.startsWith("=end") &&

                         (lineBegin == GsfUtilities.getRowStart(baseDoc.getText(), offset))) {

                     // It could be a =begin,=end document - see scanf.rb in Ruby lib for example. Treat this differently.

                     gatherInlineDocumentation(comments, baseDoc, offset);

                     return comments;

                 } else if (line.equals("public") || line.equals("private") ||

                         line.equals("protected")) { // NOI18N

                                                     // Skip newlines back up to the comment

                     offset--;

                     while (offset >= 0) {

                         // Find beginning of line

                         offset = GsfUtilities.getRowStart(baseDoc.getText(), offset);

                         if (!GsfUtilities.isRowEmpty(baseDoc.getText(), offset) &&

                                 !GsfUtilities.isRowWhite(baseDoc.getText(), offset)) {

                             break;

                         }

                         offset--;

                     }

                     continue;

                 } else {

                     // No longer in a comment

                     break;

                 }

                 // Previous line

                 offset--;

             }

         } catch (BadLocationException ble) {

             // do nothing - see #154991

         }

         return comments;

     }

     private static void gatherInlineDocumentation(LinkedList<String> comments,

         Snapshot baseDoc, int offset) throws BadLocationException {

         // offset points to a line containing =end

         // Skip the =end list

         offset = GsfUtilities.getRowStart(baseDoc.getText(), offset);

         offset--;

         // Search backwards in the document for the =begin (if any) and add all lines in reverse

         // order in between.

         while (offset >= 0) {

             // Find beginning of line

             offset = GsfUtilities.getRowStart(baseDoc.getText(), offset);

             // This is a comment line we should include

             int lineBegin = offset;

             int lineEnd = GsfUtilities.getRowEnd(baseDoc.getText(), offset);

             String line = baseDoc.getText().subSequence(lineBegin, lineEnd).toString();

             if (line.startsWith("=begin")) return;  // We're done!

             comments.addFirst(line);

             // Previous line

             offset--;

         }

     }

     /**

      * <strong>This method may block for a long time; use with caution.</strong>.

      */

     public static Node getForeignNode(final IndexedElement elem) {

         return getForeignNode(elem, null);

     }

     /**

      * <strong>This method may block for a long time; use with caution.</strong>.

      * @param elem

      * @param foreignInfoHolder

      * @return

      */

     public static Node getForeignNode(final IndexedElement elem, final Parser.Result[] foreignInfoHolder) {

         FileObject fo = elem.getFileObject();

         if (fo == null) {

             return null;

         }

         Source source = Source.create(fo);

         final Node[] nodeHolder = new Node[1];

         try {

             ParserManager.parse(Collections.singleton(source), new UserTask() {

                 @Override

                 public void run(ResultIterator resultIterator) throws Exception {

                     Parser.Result result = resultIterator.getParserResult();

                     if (foreignInfoHolder != null) {

                         assert foreignInfoHolder.length == 1;

                         foreignInfoHolder[0] = result;

                     }

                     Node root = AstUtilities.getRoot(result);

                     if (root != null) {

                         String signature = elem.getSignature();

                         if (signature != null) {

                             Node node = AstUtilities.findBySignature(root, signature);

                             // Special handling for "new" - these are synthesized from "initialize" methods

                             if ((node == null) && "new".equals(elem.getName())) { // NOI18N

                                 if (signature.indexOf("#new") != -1) {

                                     signature = signature.replaceFirst("#new", "#initialize"); //NOI18N

                                 } else {

                                     signature = signature.replaceFirst("new", "initialize"); //NOI18N

                                 }

                                 node = AstUtilities.findBySignature(root, signature);

                             }

                             nodeHolder[0] = node;

                         }

                     }

                 }

             });

         } catch (ParseException ex) {

             Exceptions.printStackTrace(ex);

             return null;

         }

         return nodeHolder[0];

     }

 //    public static Node getForeignNode(final IndexedElement o) {

 //        FileObject fo = o.getFileObject();

 //        if (fo == null) {

 //            return null;

 //        }

 //

 //        if (file == null) {

 //            return null;

 //        }

 //

 //        List<ParserFile> files = Collections.singletonList(file);

 //        SourceFileReader reader =

 //            new SourceFileReader() {

 //                public CharSequence read(ParserFile file)

 //                    throws IOException {

 //                    Document doc = o.getDocument();

 //

 //                    if (doc == null) {

 //                        return "";

 //                    }

 //

 //                    try {

 //                        return doc.getText(0, doc.getLength());

 //                    } catch (BadLocationException ble) {

 //                        IOException ioe = new IOException();

 //                        ioe.initCause(ble);

 //                        throw ioe;

 //                    }

 //                }

 //

 //                public int getCaretOffset(ParserFile fileObject) {

 //                    return -1;

 //                }

 //            };

 //

 //        DefaultParseListener listener = new DefaultParseListener();

 //        // TODO - embedding model?

 //        TranslatedSource translatedSource = null; // TODO - determine this here?

 //        Parser.Job job = new Parser.Job(files, listener, reader, translatedSource);

 //        new RubyParser().parseFiles(job);

 //

 //        ParserResult result = listener.getParserResult();

 //

 //        if (result == null) {

 //            return null;

 //        }

 //

 //        Node root = AstUtilities.getRoot(result);

 //

 //        if (root == null) {

 //            return null;

 //        }

 //

 //        String signature = o.getSignature();

 //

 //        if (signature == null) {

 //            return null;

 //        }

 //

 //        Node node = AstUtilities.findBySignature(root, signature);

 //

 //        // Special handling for "new" - these are synthesized from "initialize" methods

 //        if ((node == null) && "new".equals(o.getName())) { // NOI18N

 //            signature = signature.replaceFirst("new", "initialize"); //NOI18N

 //            node = AstUtilities.findBySignature(root, signature);

 //        }

 //

 //        return node;

 //    }

     public static int boundCaretOffset(ParserResult result, int caretOffset) {

         Document doc = RubyUtils.getDocument(result);

         if (doc != null) {

             // If you invoke code completion while indexing is in progress, the

             // completion job (which stores the caret offset) will be delayed until

             // indexing is complete - potentially minutes later. When the job

             // is finally run we need to make sure the caret position is still valid.

             int length = doc.getLength();

             if (caretOffset > length) caretOffset = length;

         }

         return caretOffset;

     }

     /**

      * Return the set of requires that are defined in this AST

      * (no transitive closure though).

      */

     public static Set<String> getRequires(Node root) {

         Set<String> requires = new HashSet<String>();

         addRequires(root, requires);

         return requires;

     }

     private static void addRequires(Node node, Set<String> requires) {

         if (node.getNodeType() == NodeType.FCALLNODE) {

             FCallNode fcall = (FCallNode) node;

             if ("require".equals(fcall.getName()) && fcall.getArgs() instanceof ListNode) {

                 ListNode args = (ListNode) fcall.getArgs(); // FIXME: Can this ever not be fcall?

                 if (args.size() > 0) {

                     Node n = args.get(0);

                     // For dyn-strings, we have n instances DStrNode butwe can't handle these

                     if (n instanceof StrNode) {

                         String require = ((StrNode)n).getValue();

                         if (require != null && require.length() > 0) requires.add(require.toString());

                     }

                 }

             }

         } else if (node.getNodeType() == NodeType.MODULENODE || node.getNodeType() == NodeType.CLASSNODE ||

                 node.getNodeType() == NodeType.DEFNNODE || node.getNodeType() == NodeType.DEFSNODE) {

             return; // Only look for require statements at the top level

         }

         for (Node child : node.childNodes()) {

             addRequires(child, requires);

         }

     }

     /** Locate the method of the given name and arity */

     public static MethodDefNode findMethod(Node node, String name, Arity arity) {

         // Recursively search for methods or method calls that match the name and arity

         if (node instanceof MethodDefNode && (((INameNode) node).getName()).equals(name) && 

                 Arity.matches(arity, Arity.getArity((MethodDefNode) node))) return (MethodDefNode) node;

         for (Node child : node.childNodes()) {

             MethodDefNode match = findMethod(child, name, arity);

             if (match != null) return match;

         }

         return null;

     }

     /**

      * Gets the closest node at the given offset.

      * 

      * @param root

      * @param offset

      * @return the closest node or <code>null</code>.

      */

     public static Node findNodeAtOffset(Node root, int offset) {

         return root == null ? null : root.getNodeAt(offset);

     }

     public static MethodDefNode findMethodAtOffset(Node root, int offset) {

         Node child = findNodeAtOffset(root, offset);

         return child == null ? null : child.getMethodFor();

     }

     // FIXME: Replace this with something which returns nearest module...Do we really specifically need class?

     public static ClassNode findClassAtOffset(Node root, int offset) {

         for (Node node: new AstPath(root, offset)) {

             if (node instanceof ClassNode) return (ClassNode) node;

         }

         return null;

     }

     public static Node findLocalScope(Node node, AstPath path) {

         Node method = findMethod(path);

         if (method != null) return method;

         if (path.root() != null) return path.root();

         method = findBlock(path);

         if (method != null) return method;

         method = path.leafParent();

         if (method.getNodeType() == NodeType.NEWLINENODE) method = path.leafGrandParent();

         if (method == null) method = node;

         return method;

     }

     public static Node findDynamicScope(Node node, AstPath path) {

         Node block = findBlock(path);

         if (block == null) {

             block = path.leafParent(); // Use parent

             if (block == null) block = node;

         }

         return block;

     }

     // Enebo: This method is not what the name or comment says it is?  findOuterMostBlockScope?

     public static Node findBlock(AstPath path) {

         Node candidate = null;

         for (Node curr : path) {

             if (curr instanceof IterNode) candidate = curr;

             if (curr instanceof ILocalScope) return candidate;

         }

         return candidate;

     }

     /** Find the closest method enclosing the given node */

     public static MethodDefNode findMethod(AstPath path) {

         for (Node curr : path) {

             if (curr instanceof MethodDefNode) return (MethodDefNode) curr;

             if (curr instanceof ILocalScope) break; // No def/defs so bump off early

         }

         return null;

     }

     // XXX Shouldn't this go in the REVERSE direction? I might find

     // a superclass here!

     // XXX What about SClassNode?

     public static ClassNode findClass(AstPath path) {

         // Find the closest block node enclosing the given node

         for (Node curr : path) {

             if (curr instanceof ClassNode) {

                 return (ClassNode)curr;

             }

         }

         return null;

     }

     public static IScopingNode findClassOrModule(AstPath path) {

         // Find the closest block node enclosing the given node

         for (Node curr : path) {

             // XXX What about SClassNodes?

             if (curr.getNodeType() == NodeType.CLASSNODE || curr.getNodeType() == NodeType.MODULENODE) {

                 return (IScopingNode)curr;

             }

         }

         return null;

     }

     public static boolean isCall(Node node) {

         return node.getNodeType() == NodeType.FCALLNODE ||

                 node.getNodeType() == NodeType.VCALLNODE ||

                 node.getNodeType() == NodeType.CALLNODE;

     }

     static boolean isRaiseCall(Node node) {

         return isCall(node) && "raise".equals(((INameNode) node).getName());

     }

     static Node findNextNonNewLineNode(Node target) {

         if (target.getNodeType() != NodeType.NEWLINENODE) {

             return target;

         }

         NewlineNode newlineNode = (NewlineNode) target;

         return findNextNonNewLineNode(newlineNode.getNextNode());

     }

     public static String getCallName(Node node) {

         assert isCall(node);

         if (node instanceof INameNode) return ((INameNode) node).getName();

         return null;

     }

     public static String getDefName(Node node) {

         if (node instanceof MethodDefNode) return ((MethodDefNode) node).getName();

         assert false : node;

         return null;

     }

     public static boolean isConstructorMethod(MethodDefNode node) {

         String name = node.getName();

         return name.equals("new") || name.equals("initialize"); // NOI18N

     }

     /**

      * Look for the caret offset in the parameter list; return the

      * index of the parameter that contains it.

      */

     public static int findArgumentIndex(Node node, int offset) {

         switch (node.getNodeType()) {

         case FCALLNODE: case CALLNODE: {

             Node argsNode = ((IArgumentNode)node).getArgs();

             return argsNode == null ? -1 : findArgumentIndex(argsNode, offset);

         }

         case ARGSCATNODE: {

             ArgsCatNode acn = (ArgsCatNode)node;

             int index = findArgumentIndex(acn.getFirst(), offset);

             if (index != -1) return index;

             index = findArgumentIndex(acn.getSecond(), offset);

             if (index != -1) return getConstantArgs(acn) + index; // Add in arg count on the left

             SourcePosition pos = node.getPosition();

             if (offset >= pos.getStartOffset() && offset <= pos.getEndOffset())return getConstantArgs(acn);

             return -1;

         }

         case HASHNODE: 

             // Everything gets glommed into the same hash parameter offset

             return offset;

         default:

             if (node instanceof ListNode) {

                 List<Node> children = node.childNodes();

                 int prevEnd = Integer.MAX_VALUE;

                 for (int index = 0; index < children.size(); index++) {

                     Node child = children.get(index);

                     SourcePosition pos = child.getPosition();

                     if  (offset <= pos.getEndOffset() && (offset >= prevEnd || offset >= pos.getStartOffset())) return index;

                     prevEnd = pos.getEndOffset();

                 }

                 // Caret -inside- empty parentheses?

                 SourcePosition pos = node.getPosition();

                 if (offset > pos.getStartOffset() && offset < pos.getEndOffset()) return 0;

             } else {

                 SourcePosition pos = node.getPosition();

                 if (offset >= pos.getStartOffset() && offset <= pos.getEndOffset()) return 0;

             }

             return -1;

         }

     }

     /** Utility method used by findArgumentIndex: count the constant number of

      * arguments in a parameter list before the argscatnode */

     private static int getConstantArgs(ArgsCatNode acn) {

         Node node = acn.getFirst();

         if (node instanceof ListNode) {

             List<Node> children = node.childNodes();

 // TODO - if one of the children is Node.INVALID_POSITION perhaps I need to reduce the count            

             return children.size();

         } 

         return 1;

     }

     /**

      * Return true iff the given call note can be considered a valid call of the given method.

      */

     public static boolean isCallFor(Node call, Arity callArity, Node method) {

         assert isCall(call);

         assert method instanceof MethodDefNode;

         // Simple call today...

         return getDefName(method).equals(getCallName(call)) &&

         Arity.matches(callArity, Arity.getArity((MethodDefNode) method));

     }

     // TODO: use the structure analyzer data for more accurate traversal?

     /** For the given signature, locating the corresponding Node within the tree that

      * it corresponds to */

     public static Node findBySignature(Node root, String signature) {

         String originalSig = signature;

         //String name = signature.split("(::)")

         // Find next name we're looking for

         boolean[] lookingForMethod = new boolean[1];

         String name = getNextSigComponent(signature, lookingForMethod);

         signature = signature.substring(name.length());

         Node node = findBySignature(root, root, signature, name, lookingForMethod);

         // Handle top level methods

         if (node == null && originalSig.startsWith("Object#")) {

             // Just look for top level method definitions instead

             originalSig = originalSig.substring(originalSig.indexOf('#')+1);

             name = getNextSigComponent(signature, lookingForMethod);

             signature = originalSig.substring(name.length());

             lookingForMethod[0] = true;

             node = findBySignature(root, root, signature, name, lookingForMethod);

         }

         return node;

     }

     // For a signature of the form Foo::Bar#baz(arg1,arg2,...)

     // pull out the next component; in the above, successively return

     // "Foo", "Bar", "baz", etc.

     private static String getNextSigComponent(String signature, boolean[] lookingForMethod) {

         StringBuilder sb = new StringBuilder();

         int i = 0;

         int n = signature.length();

         // Skip leading separators

         for (; i < n; i++) {

             char c = signature.charAt(i);

             if (c == '#') {

                 lookingForMethod[0] = true;

                 continue;

             } else if ((c == ':') || (c == '(')) {

                 continue;

             }

             break;

         }

         // Add the name

         for (; i < n; i++) {

             char c = signature.charAt(i);

             if ((c == '#') || (c == ':') || (c == '(')) {

                 break;

             }

             sb.append(c);

         }

         return sb.toString();

     }

     private static Node findBySignature(Node root, Node node, String signature, String name, boolean[] lookingForMethod) {

         switch (node.getNodeType()) {

         case INSTASGNNODE:

             if (name.charAt(0) == '@' && name.equals(((INameNode) node).getLexicalName())) return node;

             break;

         case CLASSVARDECLNODE: case CLASSVARASGNNODE:

             if (name.startsWith("@@") && name.equals(((INameNode) node).getLexicalName())) return node;

             break;

         case DEFNNODE:

         case DEFSNODE: {

             MethodDefNode def = (MethodDefNode) node;

             if (lookingForMethod[0] && name.equals(def.getName())) {

                 // See if the parameter list matches

                 // XXX TODO

                 List<String> parameters = def.getArgs().getNormativeParameterNameList(false);

                 if (signature.length() == 0 && (parameters == null || parameters.isEmpty())) {

                     return def; // No args

                 } else if (signature.length() != 0) {

                     assert signature.charAt(0) == '(' : signature;

                     String argList = signature.substring(1, signature.length() - 1);

                     String[] args = argList.split(",");

                     if (args.length == parameters.size()) {

                         // Should I enforce equality here?

                         boolean equal = true;

                         for (int i = 0; i < args.length; i++) {

                             if (!args[i].equals(parameters.get(i))) {

                                 equal = false;

                                 break;

                             }

                         }

                         if (equal) return def;

                     }

                 }

             } else if (isAttr(def)) {

                 for (SymbolNode sym : getAttrSymbols(def)) {

                     if (name.equals(sym.getName())) return node;

                 }

             }

             break;

         }

         case FCALLNODE:

             if (isAttr(node) || isNamedScope(node) || isActiveRecordAssociation(node) || 

                     isNodeNameIn((INameNode) node, RubyStructureAnalyzer.DYNAMIC_METHODS)) {

                 for (Node each : getChildValues(node)) {

                     if (name.equals(getNameOrValue(each))) return each;

                 }

             } else if (TestNameResolver.isShouldaMethod(((INameNode) node).getName())) {

                 String shoulda = TestNameResolver.getTestName(new AstPath(root, node));

                 if (name.equals(shoulda)) return node;

             }

             break;

         case ALIASNODE:

             AliasNode aliasNode = (AliasNode) node;

             if (name.equals(getNameOrValue(aliasNode.getNewName())) || name.equals(getNameOrValue(aliasNode.getOldName()))) {

                 return aliasNode;

             }

             break;

         case CONSTDECLNODE:

             if (name.equals(getName(node))) return node;

         break;

         case CLASSNODE:

         case MODULENODE: {

                 Colon3Node c3n = ((IScopingNode)node).getCPath();

                 if (c3n instanceof Colon2Node) {

                     String fqn = getFqn((Colon2Node)c3n);

                     if (fqn.startsWith(name) && signature.startsWith(fqn.substring(name.length()))) {

                         signature = signature.substring(fqn.substring(name.length()).length());

                         name = getNextSigComponent(signature, lookingForMethod);

                         if (name.length() == 0) return node; // Signature is a class/module already.

                         int index = signature.indexOf(name);

                         assert index != -1;

                         signature = signature.substring(index + name.length());

                     }

                 } else if (name.equals(AstUtilities.getClassOrModuleName(((IScopingNode)node)))) {

                     name = getNextSigComponent(signature, lookingForMethod);

                     if (name.length() == 0) return node; // Signature is a class/module already.

                     int index = signature.indexOf(name);

                     assert index != -1;

                     signature = signature.substring(index + name.length());

                 }

             break;

         }

         case SCLASSNODE:

             Node receiver = ((SClassNode)node).getReceiver();

             String rn = null;

             if (receiver instanceof Colon2Node) {

                 // TODO - check to see if we qualify

                 rn = getName(receiver);

             } else if (receiver instanceof ConstNode) {

                 rn = getName(receiver);

             } // else: some other type of singleton class definition, like class << foo

             if (rn != null) {

                 if (name.equals(rn)) {

                     name = getNextSigComponent(signature, lookingForMethod);

                     if (name.length() == 0) return node; // Signature is a class/module already.

                     int index = signature.indexOf(name);

                     assert index != -1;

                     signature = signature.substring(index + name.length());

                 }

             }

             break;

         }

         boolean old = lookingForMethod[0];

         for (Node child : node.childNodes()) {

             Node match = findBySignature(root, child, signature, name, lookingForMethod);

             if (match != null) return match;

         }

         lookingForMethod[0] = old;

         return null;

     }

     /** Return true iff the given node contains the given offset */

     public static boolean containsOffset(Node node, int offset) {

         SourcePosition pos = node.getPosition();

         return ((offset >= pos.getStartOffset()) && (offset <= pos.getEndOffset()));

     }

     /**

      * Like {@link #getRange(org.jrubyparser.ast.Node) }, but returns a position

      * for <code>NilNode</code>s too (but <strong>not</strong> for 

      * <code>NilImplicitNode</code>s!!). This is needed for highlightning 

      * exit points, <code>nil</code> is a common return value. Possibly 

      * {@link #getRange(org.jrubyparser.ast.Node) } itself should return a range

      * for <code>NilNode</code>s, but I'm too afraid to change it now as it 

      * is used in a lot of places.

      * @param node

      * @return

      */

     static OffsetRange getRangeIncludeNil(Node node) {

         if (node != null && node.getClass().equals(NilNode.class)) {

             SourcePosition pos = node.getPosition();

             try {

                 return new OffsetRange(pos.getStartOffset(), pos.getEndOffset());

             } catch (Throwable t) {

                 // ...because there are some problems -- see AstUtilities.testStress

                 Exceptions.printStackTrace(t);

                 return OffsetRange.NONE;

             }

         }

         return getRange(node);

     }

     /**

      * Return a range that matches the given node's source buffer range

      */

     public static OffsetRange getRange(Node node) {

         if (node.getNodeType() == NodeType.NILNODE) return OffsetRange.NONE;

         SourcePosition pos = node.getPosition();

         try {

             return new OffsetRange(pos.getStartOffset(), pos.getEndOffset());

         } catch (Throwable t) {

             // ...because there are some problems -- see AstUtilities.testStress

             Exceptions.printStackTrace(t);

             return OffsetRange.NONE;

         }

     }

     public static OffsetRange offsetRangeFor(SourcePosition position) {

         return new OffsetRange(position.getStartOffset(), position.getEndOffset());

     }

     public static OffsetRange getNameRange(Node node) {

         if (node instanceof AssignableNode) {

             return offsetRangeFor(((AssignableNode)node).getLeftHandSidePosition());

         } else if (node instanceof MethodDefNode) {

             return offsetRangeFor(((INameNode) node).getLexicalNamePosition());

         } else if (isCall(node)) {

             return getCallRange(node);

         } else if (node instanceof ClassNode) {

             // TODO - try to pull out the constnode or colon2node holding the class name,

             // and return it!

             Colon3Node c3n = ((ClassNode)node).getCPath();

             if (c3n != null) {

                 return getRange(c3n);

             } else {

                 return getRange(node);

             }

         } else if (node instanceof ModuleNode) {

             // TODO - try to pull out the constnode or colon2node holding the class name,

             // and return it!

             Colon3Node c3n = ((ModuleNode)node).getCPath();

             if (c3n != null) {

                 return getRange(c3n);

             } else {

                 return getRange(node);

             }

 //        } else if (node instanceof SClassNode) {

 //            // TODO - try to pull out the constnode or colon2node holding the class name,

 //            // and return it!

 //            Colon3Node c3n = ((SClassNode)node).getCPath();

 //            if (c3n != null) {

 //                return getRange(c3n);

 //            } else {

 //                return getRange(node);

 //            }

         } else {

             return getRange(node);

         }

     }

     /** For CallNodes, the offset range for the AST node includes the entire parameter list.

      *  We want ONLY the actual call/operator name. So compute that on our own.

      */

     public static OffsetRange getCallRange(Node node) {

         SourcePosition pos = node.getPosition();

         int start = pos.getStartOffset();

         assert isCall(node);

         assert node instanceof INameNode;

         if (node instanceof CallNode) {

             // A call of the form Foo.bar. "bar" is the CallNode, "Foo" is the ReceiverNode.

             // Here I'm only handling named nodes; there may be others

             Node receiver = ((CallNode)node).getReceiver();

             // end of "Foo::bar" + "."

             if (receiver != null) start = receiver.getPosition().getEndOffset() + 1; 

         }

         int end = node instanceof INameNode ? start + getName(node).length() : pos.getEndOffset();

         return new OffsetRange(start, end);

     }

     /*

     public static OffsetRange getFunctionNameRange(Node node) {

         // TODO - enforce MethodDefNode and call getNameNode on it!

         for (Node child : node.childNodes()) {

             if (child instanceof ArgumentNode) {

                 OffsetRange range = AstUtilities.getRange(child);

                 return range;

             }

         }

         if (node instanceof MethodDefNode) {

             for (Node child : node.childNodes()) {

                 if (child instanceof ConstNode) {

                     SourcePosition pos = child.getPosition();

                     int end = pos.getEndOffset();

                     int start;

                     if (INCLUDE_DEFS_PREFIX) {

                         start = pos.getStartOffset();

                     } else {

                         start = end + 1;

                     }

                     // TODO - look at the source buffer and tweak offset if it's wrong

                     // This assumes we have a single constant node, followed by a dot, followed by the name

                     end = end + 1 + AstUtilities.getDefName(node).length(); // +1: "."

                     OffsetRange range = new OffsetRange(start, end);

                     return range;

                 }

             }

         }

         return OffsetRange.NONE;

     }*/

     /**

      * Return the OffsetRange for an AliasNode that represents the new name portion.

      */

     public static OffsetRange getAliasNewRange(AliasNode node) {

         // XXX I don't know where the old and new names are since the user COULD

         // have used more than one whitespace character for separation. For now I'll

         // just have to assume it's the normal case with one space:  alias new old.

         // I -could- use the getPosition.getEndOffset() to see if this looks like it's

         // the case (e.g. node length != "alias ".length + old.length+new.length+1).

         // In this case I could go peeking in the source buffer to see where the

         // spaces are - between alias and the first word or between old and new. XXX.

         SourcePosition pos = node.getPosition();

         int newStart = pos.getStartOffset() + 6; // 6: "alias ".length()

         String name = getNameOrValue(node.getNewName());

         int length = name != null ? name.length() : 0;

         return new OffsetRange(newStart, newStart + length);

     }

     /**

      * Return the OffsetRange for an AliasNode that represents the old name portion.

      */

     public static OffsetRange getAliasOldRange(AliasNode node) {

         // XXX I don't know where the old and new names are since the user COULD

         // have used more than one whitespace character for separation. For now I'll

         // just have to assume it's the normal case with one space:  alias new old.

         // I -could- use the getPosition.getEndOffset() to see if this looks like it's

         // the case (e.g. node length != "alias ".length + old.length+new.length+1).

         // In this case I could go peeking in the source buffer to see where the

         // spaces are - between alias and the first word or between old and new. XXX.

         SourcePosition pos = node.getPosition();

         String newName = getNameOrValue(node.getNewName());

         int newLength = newName != null ? newName.length() : 0;

         String oldName = getNameOrValue(node.getOldName());

         int oldLength = oldName != null ? oldName.length() : 0;

         int oldStart = pos.getStartOffset() + 6 + newLength + 1; // 6: "alias ".length; 1: " ".length

         return new OffsetRange(oldStart, oldStart + oldLength);

     }

     public static String getClassOrModuleName(IScopingNode node) {

         return getName(node.getCPath());

     }

     public static List<ClassNode> getClasses(Node root) {

         // I would like to use a visitor for this, but it's not

         // working - I get NPE's within DefaultIteratorVisitor

         // on valid ASTs, and I see it's not used heavily in JRuby,

         // so I'm not doing it this way for now.

         //final List<ClassNode> classes = new ArrayList<ClassNode>();

         //// There could be multiple Class definitions for this

         //// same class, and (empirically) rdoc shows the documentation

         //// for the last declaration.

         //NodeVisitor findClasses = new AbstractVisitor() {

         //    public Instruction visitClassNode(ClassNode node) {

         //        classes.add(node);

         //        return visitNode(node);

         //    }

         //

         //    protected Instruction visitNode(Node iVisited) {

         //        return null;

         //    }

         //};

         //new DefaultIteratorVisitor(findClasses).visitRootNode((RootNode)parseResult.getRootNode());

         List<ClassNode> classes = new ArrayList<ClassNode>();

         addClasses(root, classes);

         return classes;

     }

     private static void addClasses(Node node, List<ClassNode> classes) {

         if (node instanceof ClassNode) classes.add((ClassNode)node);

         for (Node child : node.childNodes()) {

             addClasses(child, classes);

         }

     }

     private static void addAncestorParents(Node node, StringBuilder sb) {

         if (node instanceof Colon2Node) {

             Colon2Node c2n = (Colon2Node)node;

             addAncestorParents(c2n.getLeftNode(), sb);

             if ((sb.length() > 0) && (sb.charAt(sb.length() - 1) != ':')) {

                 sb.append("::");

             }

             sb.append(c2n.getName());

         } else if (node instanceof INameNode) {

             if ((sb.length() > 0) && (sb.charAt(sb.length() - 1) != ':')) {

                 sb.append("::");

             }

             sb.append(getName(node));

         }

     }

     public static String getFqn(Colon2Node c2n) {

         StringBuilder sb = new StringBuilder();

         addAncestorParents(c2n, sb);

         return sb.toString();

     }

     public static String getSuperclass(ClassNode clz) {

         if (clz.getSuper() == null) return null;

         StringBuilder sb = new StringBuilder();

         addAncestorParents(clz.getSuper(), sb);

         return sb.toString();

     }

     static String getFqnName(Node root, Node target) {

         String fqn = getFqnName(new AstPath(root, target));

         if (fqn.length() > 0) {

             return fqn + "::" + getName(target);

         }

         return getName(target);

     }

     static String getFqnName(AstPath path, String simpleName) {

         String fqn = getFqnName(path);

         if (fqn.length() > 0) {

             return fqn + "::" + simpleName;

         }

         return simpleName;

     }

     /** Compute the module/class name for the given node path */

     public static String getFqnName(AstPath path) {

         StringBuilder sb = new StringBuilder();

         Iterator<Node> it = path.rootToLeaf();

         while (it.hasNext()) {

             Node node = it.next();

             if (node instanceof ModuleNode || node instanceof ClassNode) {

                 Colon3Node cpath = ((IScopingNode)node).getCPath();

                 if (cpath == null) continue;

                 if (sb.length() > 0) sb.append("::"); // NOI18N

                 if (cpath instanceof Colon2Node) {

                     sb.append(getFqn((Colon2Node)cpath));

                 } else {

                     sb.append(cpath.getName());

                 }

             }

         }

         return sb.toString();

     }

     public static boolean isAttr(Node node) {

         return isCallNode(node) && (isNodeNameIn((INameNode) node, ATTR_ACCESSORS) || isNodeNameIn((INameNode) node, CATTR_ACCESSORS));

     }

     public static boolean isCAttr(Node node) {

         return isCallNode(node) && isNodeNameIn((INameNode) node, CATTR_ACCESSORS);

     }

     static boolean isNamedScope(Node node) {

         return isCallNode(node) && isNodeNameIn((INameNode) node, NAMED_SCOPE);

     }

     public static boolean isActiveRecordAssociation(Node node) {

         return isCallNode(node) && isNodeNameIn((INameNode) node, ActiveRecordAssociationFinder.AR_ASSOCIATIONS);

     }

     static boolean isNodeNameIn(INameNode node, String... names) {

         String name = node.getName();

         for (String each : names) {

             if (each.equals(name)) return true;

         }

         return false;

     }

     private static boolean isCallNode(Node node) {

         return node instanceof FCallNode || node instanceof VCallNode;

     }

     /**

      * Returns the names or values of the nodes in the given {@code listNode}; 

      * not including null and not empty values.

      *

      * @param listNode

      * @return the names/values; the result does not contain {@code null}s or empty strings.

      */

     static List<String> getNamesOrValues(ListNode listNode) {

         List<String> result = new ArrayList<String>(listNode.size());

         for (int i = 0, max = listNode.size(); i < max; i++) {

             Node n = listNode.get(i);

             // For dynamically computed strings, we have n instanceof DStrNode

             // but I can't handle these anyway

             if (n instanceof StrNode || n instanceof SymbolNode || n instanceof ConstNode) {

                 String name = getNameOrValue(n);

                 if (name != null && !name.isEmpty()) {

                     result.add(name);

                 }

             } 

         }

         return result;

     }

     /**

      * Gets the name or the value of given node, depending on its type.

      * 

      * @param node the node whose value to get.

      * @return the name or value of the given node or <code>null</code>.

      */

     public static String getNameOrValue(Node node) {

         if (node instanceof StrNode) return ((StrNode) node).getValue();

         if (node instanceof INameNode) return getName(node);

         if (node instanceof DSymbolNode) {

             if (!node.childNodes().isEmpty()) {

                 Node child = node.childNodes().get(0);

                 return getNameOrValue(child);

             }

         }

         if (node instanceof LiteralNode) {

             return ((LiteralNode) node).getName();

         }

         return null;

     }

     static SymbolNode[] getSymbols(Node node) {

         List<SymbolNode> symbolList = new ArrayList<SymbolNode>();

         for (Node child : getChildValues(node)) {

             if (child instanceof SymbolNode) {

                 symbolList.add((SymbolNode) child);

             }

         }

         return symbolList.toArray(new SymbolNode[symbolList.size()]);

     }

     static List<Node> getChildValues(Node node) {

         List<Node> result = new ArrayList<Node>();

         for (Node child : node.childNodes()) {

             if (child instanceof ListNode) {

                 List<Node> values = child.childNodes();

                 result.addAll(values);

             }

         }

         return result;

     }

     public static SymbolNode[] getAttrSymbols(Node node) {

         assert isAttr(node);

         return getSymbols(node);

     }

     public static Node getRoot(final FileObject sourceFO) {

         Source source = Source.create(sourceFO);

         if (source == null) return null;

         final Node[] rootHolder = new Node[1];

         try {

             ParserManager.parse(Collections.singleton(source), new UserTask() {

                 @Override

                 public void run(ResultIterator ri) throws Exception {

                     Parser.Result result = ri.getParserResult();

                     rootHolder[0] = getRoot(result);

                 }

             });

         } catch (ParseException ex) {

             Exceptions.printStackTrace(ex);

         }

         return rootHolder[0];

     }

     /**

      * Gets the root node from the given <code>parserResult</code>. May return

      * <code>null</code> if <code>parserResult</code> was not a <code>RubyParserResult</code> or

      * did not have a root node. For example for parts of .erb files the parserResult might

      * (validly) be RhtmlParser$FakeParserResult, in which case this method returns <code>null</code>.

      * 

      * @param parserResult 

      * @return the root node or <code>null</code>.

      */

     public static Node getRoot(Parser.Result parserResult) {

         if (parserResult == null) return null;

         if (!(parserResult instanceof RubyParseResult)) {

             if (LOGGER.isLoggable(Level.FINE)) {

                 String msg = "Expected RubyParseResult, but got " + parserResult; //NOI18N

                 // log an exception too see the stack trace

                 LOGGER.log(Level.FINE, msg, new Exception(msg));

             }

             return null;

         }

         return ((RubyParseResult) parserResult).getRootNode();

     }

     /**

      * Get the private and protected methods in the given class

      */

     public static void findPrivateMethods(Node clz, Set<Node> protectedMethods,

         Set<Node> privateMethods) {

         Set<String> publicMethodSymbols = new HashSet<String>();

         Set<String> protectedMethodSymbols = new HashSet<String>();

         Set<String> privateMethodSymbols = new HashSet<String>();

         Set<Node> publicMethods = new HashSet<Node>();

         List<Node> list = clz.childNodes();

         Modifier access = Modifier.PUBLIC;

         for (Node child : list) {

             access = getMethodAccess(child, access, publicMethodSymbols, protectedMethodSymbols,

                     privateMethodSymbols, publicMethods, protectedMethods, privateMethods);

         }

         // Can't just return private methods directly, since sometimes you can

         // specify that a particular method is public before we know about it,

         // so I can't just remove it from the known private list when I see the

         // access modifier

         privateMethodSymbols.removeAll(publicMethodSymbols);

         protectedMethodSymbols.removeAll(publicMethodSymbols);

         // Should I worry about private foo;  protected :foo ?

         // Seems unlikely somebody would do that... I guess

         // I could do privateMethodSymbols.removeAll(protectedMethodSymbols) etc.

         //privateMethodSymbols.removeAll(protectedMethodSymbols);

         //protectedMethodSymbols.removeAll(privateMethodSymbols);

         // Add all methods known to be private into the private node set

         for (String name : privateMethodSymbols) {

             for (Node n : publicMethods) {

                 if (name.equals(AstUtilities.getDefName(n))) {

                     privateMethods.add(n);

                 }

             }

         }

         for (String name : protectedMethodSymbols) {

             for (Node n : publicMethods) {

                 if (name.equals(AstUtilities.getDefName(n))) {

                     protectedMethods.add(n);

                 }

             }

         }

     }

     /**

      * @todo Should I really recurse into classes? If I have nested classes private

      *  methods ther shouldn't be included for the parent!

      *

      * @param access The "current" known access level (PUBLIC, PROTECTED or PRIVATE)

      * @return the access level to continue with at this syntactic level

      */

     private static Modifier getMethodAccess(Node node, Modifier access,

         Set<String> publicMethodSymbols, Set<String> protectedMethodSymbols,

         Set<String> privateMethodSymbols, Set<Node> publicMethods, Set<Node> protectedMethods,

         Set<Node> privateMethods) {

         if (node instanceof MethodDefNode) {

             if (access == Modifier.PRIVATE) {

                 privateMethods.add(node);

             } else if (access == Modifier.PUBLIC) {

                 publicMethods.add(node);

             } else if (access == Modifier.PROTECTED) {

                 protectedMethods.add(node);

             }

             // XXX Can I have nested method definitions? If so I may have to continue here

             return access;

         } else if (node instanceof VCallNode || node instanceof FCallNode) {

             String name = getName(node);

             if ("private".equals(name)) {

                 // TODO - see if it has arguments, if it does - it's just a single

                 // method defined to be private

                 // Iterate over arguments and add symbols...

                 if (Arity.callHasArguments(node)) {

                     List<Node> params = node.childNodes();

                     for (Node param : params) {

                         if (param instanceof ListNode) {

                             List<Node> params2 = param.childNodes();

                             for (Node param2 : params2) {

                                 if (param2 instanceof SymbolNode) {

                                     String symbol = getName(param2);

                                     privateMethodSymbols.add(symbol);

                                 }

                             }

                         }

                     }

                 } else {

                     access = Modifier.PRIVATE;

                 }

                 return access;

             } else if ("protected".equals(name)) {

                 // TODO - see if it has arguments, if it does - it's just a single

                 // method defined to be private

                 // Iterate over arguments and add symbols...

                 if (Arity.callHasArguments(node)) {

                     List<Node> params = node.childNodes();

                     for (Node param : params) {

                         if (param instanceof ListNode) {

                             List<Node> params2 = param.childNodes();

                             for (Node param2 : params2) {

                                 if (param2 instanceof SymbolNode) {

                                     String symbol = getName(param2);

                                     protectedMethodSymbols.add(symbol);

                                 }

                             }

                         }

                     }

                 } else {

                     access = Modifier.PROTECTED;

                 }

                 return access;

             } else if ("public".equals(name)) {

                 if (!Arity.callHasArguments(node)) {

                     access = Modifier.PUBLIC;

                     return access;

                 } else {

                     List<Node> params = node.childNodes();

                     for (Node param : params) {

                         if (param instanceof ListNode) {

                             List<Node> params2 = param.childNodes();

                             for (Node param2 : params2) {

                                 if (param2 instanceof SymbolNode) {

                                     String symbol = getName(param2);

                                     publicMethodSymbols.add(symbol);

                                 }

                             }

                         }

                     }

                 }

             }

             return access;

         } else if (node instanceof ClassNode || node instanceof ModuleNode) {

             return access;

         }

         for (Node child : node.childNodes()) {

             access = getMethodAccess(child, access, publicMethodSymbols, protectedMethodSymbols,

                     privateMethodSymbols, publicMethods, protectedMethods, privateMethods);

         }

         return access;

     }

     /**

      * Get the method name for the given offset - or null if it cannot be found. This

      * will initiate a new parse job if necessary.

      */

     public static String getMethodName(FileObject fo, final int lexOffset) {

         Source source = Source.create(fo);

         if (source == null) {

             return null;

         }

         final String[] methodName = new String[1];

         try {

             ParserManager.parse(Collections.singleton(source), new UserTask() {

                 @Override

                 public void run(ResultIterator resultIterator) throws Exception {

                     Parser.Result result = resultIterator.getParserResult();

                     Node root = AstUtilities.getRoot(result);

                     if (root == null) {

                         return;

                     }

                     int astOffset = AstUtilities.getAstOffset(result, lexOffset);

                     if (astOffset == -1) {

                         return;

                     }

                     org.jrubyparser.ast.MethodDefNode method = AstUtilities.findMethodAtOffset(root, astOffset);

                     if (method == null) {

                         // It's possible the user had the caret on a line

                         // that includes a method that isn't actually inside

                         // the method block - such as the beginning of the

                         // "def" line, or the end of a line after "end".

                         // The latter isn't very likely, but the former can

                         // happen, so let's check the method bodies at the

                         // end of the current line

                         BaseDocument doc = RubyUtils.getDocument(result);

                         if (doc != null) {

                             try {

                                 int endOffset = Utilities.getRowEnd(doc, lexOffset);

                                 if (endOffset != lexOffset) {

                                     astOffset = AstUtilities.getAstOffset(result, endOffset);

                                     if (astOffset == -1) {

                                         return;

                                     }

                                     method = AstUtilities.findMethodAtOffset(root, astOffset);

                                 }

                             } catch (BadLocationException ble) {

                                 // do nothing - see #154991

                             }

                         }

                     }

                     if (method != null) {

                         methodName[0] = method.getName();

                     }

                 }

             });

         } catch (ParseException ex) {

             Exceptions.printStackTrace(ex);

         }

         return methodName[0];

     }

     /**

      * Get the test name surrounding the given offset - or null if it cannot be found.

      * NOTE: This will initiate a new parse job if necessary. 

      */

     public static String getTestName(FileObject fo, final int caretOffset) {

         Source source = Source.create(fo);

         if (source == null) {

             return null;

         }

         final String[] testName = new String[1];

         try {

             ParserManager.parse(Collections.singleton(source), new UserTask() {

                 @Override

                 public void run(ResultIterator resultIterator) throws Exception {

                     try {

                         Parser.Result result = resultIterator.getParserResult();

                         Node root = AstUtilities.getRoot(result);

                         if (root == null) {

                             return;

                         }

                         // Make sure the offset isn't at the beginning of a line

                         BaseDocument doc = RubyUtils.getDocument(result, true);

                         if (doc == null) {

                             return;

                         }

                         int lexOffset = caretOffset;

                         int rowStart = Utilities.getRowFirstNonWhite(doc, lexOffset);

                         if (rowStart != -1 && lexOffset <= rowStart) {

                             lexOffset = rowStart + 1;

                         }

                         int astOffset = AstUtilities.getAstOffset(result, lexOffset);

                         if (astOffset == -1) {

                             return;

                         }

                         AstPath path = new AstPath(root, astOffset);

                         testName[0] = TestNameResolver.getTestName(path);

                     } catch (BadLocationException ex) {

                         // do nothing - see #154991

                     }

                 }

             });

         } catch (ParseException ex) {

             Exceptions.printStackTrace(ex);

         }

         return testName[0];

     }

     public static int findOffset(FileObject fo, final String methodName) {

         Source source = Source.create(fo);

         if (source == null) {

             return -1;

         }

         final int[] offset = new int[1];

         offset[0] = -1;

         try {

             ParserManager.parse(Collections.singleton(source), new UserTask() {

                 @Override

                 public void run(ResultIterator resultIterator) throws Exception {

                     Parser.Result result = resultIterator.getParserResult();

                     Node root = AstUtilities.getRoot(result);

                     if (root == null) {

                         return;

                     }

                     org.jrubyparser.ast.Node method =

                             AstUtilities.findMethod(root, methodName, Arity.UNKNOWN);

                     if (method != null) {

                         int startOffset = method.getPosition().getStartOffset();

                         offset[0] = startOffset;

                     }

                 }

             });

         } catch (ParseException ex) {

             Exceptions.printStackTrace(ex);

         }

         return offset[0];

     }

     /** Collect nodes of the given types (node.getNodeType()==NodeType.x) under the given root */

     public static void addNodesByType(Node root, NodeType[] nodeIds, List<Node> result) {

         for (NodeType nodeId : nodeIds) {

             if (root.getNodeType() == nodeId) {

                 result.add(root);

                 break;

             }

         }

         for (Node child : root.childNodes()) {

             addNodesByType(child, nodeIds, result);

         }

     }

     public static List<Node> getOutermostToInnerMostBlocks(Node leaf) {

         Node scope = leaf.getInnermostIter();

         if (scope == null) return Collections.emptyList();

         List<Node> result = new ArrayList<Node>();

         while (scope != null) {

             result.add(scope);

             scope = scope.getInnermostIter();

         }

         Collections.reverse(result);

         return result;

     }

     /** Return all the blocknodes that apply to the given node. The outermost block

      * is returned first.

      */

     public static List<Node> getApplicableBlocks(AstPath path, boolean includeNested) {

         Node block = AstUtilities.findBlock(path);

         if (block == null) { // Use parent

             block = path.leafParent();

             if (block == null) return Collections.emptyList();

         }

         List<Node> result = new ArrayList<Node>();

         Iterator<Node> it = path.leafToRoot();

         // Skip the leaf node, we're going to add it unconditionally afterwards

         if (includeNested) {

             if (it.hasNext()) it.next();

         }

         Node leaf = path.root();

         while_loop:

         while (it.hasNext()) {

             Node n = it.next();

             switch (n.getNodeType()) {

                 case ITERNODE:

                     leaf = n;

                     result.add(n);

                     break;

                 case DEFNNODE:

                 case DEFSNODE:

                 case CLASSNODE:

                 case SCLASSNODE:

                 case MODULENODE:

                     leaf = n;

                     break while_loop;

             }

         }

         if (includeNested) {

             addNodesByType(leaf, new NodeType[] { NodeType.ITERNODE }, result);

         }

       return result;

     }

     public static String guessName(Parser.Result result, OffsetRange lexRange, OffsetRange astRange) {

         String guessedName = "";

         // Try to guess the name - see if it's in a method and if so name it after the parameter

         IndexedMethod[] methodHolder = new IndexedMethod[1];

         @SuppressWarnings("unchecked") Set<IndexedMethod>[] alternatesHolder = new Set[1];

         int[] paramIndexHolder = new int[1];

         int[] anchorOffsetHolder = new int[1];

         if (!RubyMethodCompleter.computeMethodCall(result, lexRange.getStart(), astRange.getStart(),

                 methodHolder, paramIndexHolder, anchorOffsetHolder, alternatesHolder, QuerySupport.Kind.PREFIX)) {

             return guessedName;

         }

         IndexedMethod targetMethod = methodHolder[0];

         int index = paramIndexHolder[0];

         List<String> params = targetMethod.getParameters();

         if (params == null || params.size() <= index) {

             return guessedName;

         }

         String s = params.get(index);

         if (s.startsWith("*") || s.startsWith("&")) { // Don't include * or & in variable name

             s = s.substring(1);

         }

         return s;

     }

     public static Set<String> getUsedFields(RubyIndex index, AstPath path) {

         String fqn = AstUtilities.getFqnName(path);

         if (fqn == null || fqn.length() == 0) {

             return Collections.emptySet();

         }

         Set<IndexedField> fields = index.getInheritedFields(fqn, "", QuerySupport.Kind.PREFIX, false);

         Set<String> fieldNames = new HashSet<String>();

         for (IndexedField f : fields) {

             fieldNames.add(f.getName());

         }

         return fieldNames;

     }

     public static Set<String> getUsedMethods(RubyIndex index, AstPath path) {

         String fqn = AstUtilities.getFqnName(path);

         if (fqn == null || fqn.length() == 0) {

             return Collections.emptySet();

         }

         Set<IndexedMethod> methods = index.getInheritedMethods(fqn, "", QuerySupport.Kind.PREFIX);

         Set<String> methodNames = new HashSet<String>();

         for (IndexedMethod m : methods) {

             methodNames.add(m.getName());

         }

         return methodNames;

     }

     /** @todo Implement properly */

     public static Set<String> getUsedConstants(RubyIndex index, AstPath path) {

         //String fqn = AstUtilities.getFqnName(path);

         //if (fqn == null || fqn.length() == 0) {

             return Collections.emptySet();

         //}

         //Set<IndexedConstant> constants = index.getInheritedConstants(fqn, "", QuerySupport.Kind.PREFIX);

         //Set<String> constantNames = new HashSet<String>();

         //for (IndexedConstant m : constants) {

         //    constantNames.add(m.getName());

         //}

         //

         //return constantNames;

     }

     public static Set<String> getUsedLocalNames(AstPath path, Node closest) {

         Node method = AstUtilities.findLocalScope(closest, path);

         Map<String, Node> variables = new HashMap<String, Node>();

         // Add locals

         RubyCodeCompleter.addLocals(method, variables);

         List<Node> applicableBlocks = AstUtilities.getApplicableBlocks(path, false);

         for (Node block : applicableBlocks) {

             RubyCodeCompleter.addDynamic(block, variables);

         }

         return variables.keySet();

     }

     /**

      * Throws {@link ClassCastException} if the given node is not instance of

      * {@link INameNode} or {@link LiteralNode}.

      *

      * @param node instance of {@link INameNode} or {@link LiteralNode}.

      * @return node's name

      */

     public static String getName(final Node node) {

         if (node instanceof LiteralNode) return ((LiteralNode) node).getName();

         return ((INameNode) node).getName();

     }

     /**

      * Like {@link #getName(org.jrubyparser.ast.Node) }, but instead of throwing

      * a CCE returns <code>null</code> if the given <code>node</code> wasn't an

      * instance of {@ INameNode}.

      *

      * @param node

      * @return the name or <code>null</code>.

      */

     static String safeGetName(final Node node) {

         if (node instanceof INameNode) return ((INameNode) node).getName();

         if (node instanceof LiteralNode) return ((LiteralNode) node).getName();

         return null;

     }

     /**

      * Finds exit points of a method definition for the given node.

      *

      * @param defNode {@link MethodDefNode method definition node}

      * @param exits accumulator for found exit points

      */

     public static void findExitPoints(final MethodDefNode defNode, final Collection<? super Node> exits) {

         Node body = defNode.getBody();

         if (body != null) findExitPoints(body, exits); // method with empty body

     }

     static void findExitPoints(final Node body, final Collection<? super Node> exits) {

         findNonLastExitPoints(body, exits);

         findLastNodes(body, exits);

     }

     /**

      * Gets the values of the given {@code args}, as fully qualified 

      * names in case of {@link Colon2Node}s.

      * @param args

      * @return

      */

     static List<String> getValuesAsFqn(ListNode args) {

         if (args.size() == 0) return Collections.emptyList();

         List<String> result = new ArrayList<String>(args.size());

         for (Node n : args.childNodes()) {

             if (n instanceof Colon2Node) {

                 result.add(getFqn((Colon2Node) n));

             } else if (n instanceof INameNode) {

                 result.add(getName(n));

             }

         }

         return result;

     }

     private static void findLastNodes(final Node node, Collection<? super Node> result) {

         if (node == null) return;

         List<Node> children = findExitChidren(node);

         if (children.isEmpty()) {

             result.add(node);

             return;

         }

         // AttrAssgn does not put arguments into an ArgsNode unfortunately.

         if (!(node instanceof AttrAssignNode)) {

             for (Node child : children) {

                 if (child instanceof ArgsNode || child instanceof ArgumentNode) {

                     // Done - no valid statement

                     result.add(node);

                     return;

                 }

                 findLastNodes(child, result);

             }

         }

     }

     private static List<Node> findExitChidren(Node node) {

         if (node instanceof IfNode) {

             IfNode ifNode = (IfNode) node;

             return Arrays.asList(ifNode.getThenBody(), ifNode.getElseBody());

         }

         if (node instanceof CaseNode) {

             CaseNode caseNode = (CaseNode) node;

             ListNode cases = caseNode.getCases();

             List<Node> result = new ArrayList<Node>(cases.childNodes());

             result.add(caseNode.getElse());

             return result;

         }

         if (node instanceof WhenNode) {

             WhenNode whenNode = (WhenNode) node;

             return Collections.singletonList(whenNode.getBody());

         }

         if (node instanceof OrNode) return node.childNodes();

         if (node instanceof AndNode) return Collections.singletonList(((AndNode) node).getSecond());

         if (node instanceof ReturnNode || isCall(node) || node instanceof ILiteralNode || node instanceof HashNode

                 || node instanceof DotNode || node instanceof NotNode || node instanceof UntilNode

                 || node instanceof DefinedNode) {

             return Collections.emptyList();

         }

         if (node instanceof RescueNode) return node.childNodes();

         List<Node> children = node.childNodes();

         if (!children.isEmpty()) {

             Node lastChild = children.get(children.size() -1);

             return Collections.singletonList(lastChild);

         }

         return children;

     }

     /** Helper for {@link #findExitPoints}. */

     private static void findNonLastExitPoints(final Node node, final Collection<? super Node> exits) {

         switch (node.getNodeType()) {

             case RETURNNODE: case YIELDNODE:

                 exits.add(node);

                 break;

             case CLASSNODE: case SCLASSNODE: case MODULENODE:

                 return; // Don't go into sub methods, classes, etc

             case FCALLNODE:

                 String name = ((INameNode) node).getName();

                 if ("fail".equals(name) || "raise".equals(name)) exits.add(node); // NOI18N

                 break;

         }

         if (node instanceof MethodDefNode) return;  // Don't go into sub methods, classes, etc

         for (Node child : node.childNodes()) {

             findNonLastExitPoints(child, exits);

         }

     }

 }