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/*
***** 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) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2001-2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
* Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* 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.Ruby;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/** Represents an alias statement (<code>alias newName oldName</code>).
*/
public class AliasNode extends Node {
private Node oldName;
private Node newName;
public AliasNode(ISourcePosition position, Node newName, Node oldName) {
super(position);
this.oldName = oldName;
this.newName = newName;
}
public NodeType getNodeType() {
return NodeType.ALIASNODE;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
public Object accept(NodeVisitor iVisitor) {
return iVisitor.visitAliasNode(this);
}
/**
* Gets the newName.
* @return the newName as in the alias statement : <code> alias <b>newName</b> oldName </code>
*/
public Node getNewName() {
return newName;
}
/**
* Gets the oldName.
* @return the oldName as in the alias statement : <code> alias newName <b>oldName</b></code>
*/
public Node getOldName() {
return oldName;
}
public List<Node> childNodes() {
return Node.createList(newName, oldName);
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
String newerName = RuntimeHelpers.interpretAliasUndefName(newName, runtime, context, self, aBlock);
String olderName = RuntimeHelpers.interpretAliasUndefName(oldName, runtime, context, self, aBlock);
return RuntimeHelpers.defineAlias(context, self, newerName, olderName);
}
}