/*

***** BEGIN LICENSE BLOCK *****

* Version: CPL 1.0/GPL 2.0/LGPL 2.1

*

* The contents of this file are subject to the Common Public

* License Version 1.0 (the "License"); you may not use this file

* except in compliance with the License. You may obtain a copy of

* the License at http://www.eclipse.org/legal/cpl-v10.html

*

* Software distributed under the License is distributed on an "AS

* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or

* implied. See the License for the specific language governing

* rights and limitations under the License.

*

* Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>

* Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>

* Copyright (C) 2002 Benoit Cerrina <b.cerrina@wanadoo.fr>

* Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>

*

* Alternatively, the contents of this file may be used under the terms of

* either of the GNU General Public License Version 2 or later (the "GPL"),

* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

* in which case the provisions of the GPL or the LGPL are applicable instead

* of those above. If you wish to allow use of your version of this file only

* under the terms of either the GPL or the LGPL, and not to allow others to

* use your version of this file under the terms of the CPL, indicate your

* decision by deleting the provisions above and replace them with the notice

* and other provisions required by the GPL or the LGPL. If you do not delete

* the provisions above, a recipient may use your version of this file under

* the terms of any one of the CPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby.ast;

import java.util.List;

import org.jruby.MetaClass;

import org.jruby.Ruby;

import org.jruby.RubyModule;

import org.jruby.ast.types.INameNode;

import org.jruby.ast.visitor.NodeVisitor;

import org.jruby.evaluator.ASTInterpreter;

import org.jruby.lexer.yacc.ISourcePosition;

import org.jruby.runtime.Block;

import org.jruby.runtime.ThreadContext;

import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.util.ByteList;

/**

* Access to a class variable.

*/

public class ClassVarNode extends Node implements INameNode {

private String name;

public ClassVarNode(ISourcePosition position, String name) {

super(position);

this.name = name;

}

public NodeType getNodeType() {

return NodeType.CLASSVARNODE;

}

/**

* Accept for the visitor pattern.

* @param iVisitor the visitor

**/

public Object accept(NodeVisitor iVisitor) {

return iVisitor.visitClassVarNode(this);

}

/**

* Gets the name.

* @return Returns a String

*/

public String getName() {

return name;

}

public List<Node> childNodes() {

return EMPTY_LIST;

}

public void setName(String name) {

this.name = name;

}

@Override

public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {

RubyModule rubyClass = ASTInterpreter.getClassVariableBase(context, runtime);

if (rubyClass == null) rubyClass = self.getMetaClass();

return rubyClass.getClassVar(name);

}

@Override

public ByteList definition(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {

//RubyModule module = context.getRubyClass();

RubyModule module = context.getCurrentScope().getStaticScope().getModule();

if (module == null && self.getMetaClass().isClassVarDefined(name)) {

return CLASS_VARIABLE_BYTELIST;

} else if (module.isClassVarDefined(name)) {

return CLASS_VARIABLE_BYTELIST;

}

IRubyObject attached = module.isSingleton() ? ((MetaClass)module).getAttached() : null;

if (attached instanceof RubyModule && ((RubyModule) attached).isClassVarDefined(name)) {

return CLASS_VARIABLE_BYTELIST;

}

return null;

}

}