/*
***** 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>
* Copyright (C) 2006 Lukas Felber <lfelber@hsr.ch>
*
* 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.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyClass.VariableAccessor;
import org.jruby.ast.types.IArityNode;
import org.jruby.ast.types.INameNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.common.IRubyWarnings.ID;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;
/**
* Represents an instance variable accessor.
*/
public class InstVarNode extends Node implements IArityNode, INameNode {
private String name;
private VariableAccessor accessor = VariableAccessor.DUMMY_ACCESSOR;
public InstVarNode(ISourcePosition position, String name) {
super(position);
this.name = name;
}
public NodeType getNodeType() {
return NodeType.INSTVARNODE;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
public Object accept(NodeVisitor iVisitor) {
return iVisitor.visitInstVarNode(this);
}
/**
* A variable accessor takes no arguments.
*/
public Arity getArity() {
return Arity.noArguments();
}
/**
* 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) {
RubyClass cls = self.getMetaClass().getRealClass();
VariableAccessor localAccessor = accessor;
IRubyObject value;
if (localAccessor.getClassId() != cls.hashCode()) {
localAccessor = cls.getVariableAccessorForRead(name);
if (localAccessor == null) return runtime.getNil();
value = (IRubyObject)localAccessor.get(self);
accessor = localAccessor;
} else {
value = (IRubyObject)localAccessor.get(self);
}
if (value != null) return value;
if (runtime.isVerbose()) warnAboutUninitializedIvar(runtime);
return runtime.getNil();
}
private void warnAboutUninitializedIvar(Ruby runtime) {
runtime.getWarnings().warning(ID.IVAR_NOT_INITIALIZED, getPosition(),
"instance variable " + name + " not initialized");
}
@Override
public ByteList definition(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
return self.getInstanceVariables().fastHasInstanceVariable(name) ? INSTANCE_VARIABLE_BYTELIST : null;
}
}