/*
***** 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.RubySymbol;
import org.jruby.ast.types.ILiteralNode;
import org.jruby.ast.types.INameNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.evaluator.Instruction;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* Represents a symbol (:symbol_name).
*/
public class SymbolNode extends Node implements ILiteralNode, INameNode {
private String name;
private RubySymbol symbol;
public SymbolNode(ISourcePosition position, String name) {
super(position, NodeType.SYMBOLNODE);
this.name = name;
}
public Instruction accept(NodeVisitor iVisitor) {
return iVisitor.visitSymbolNode(this);
}
/**
* Gets the name.
* @return Returns a String
*/
public String getName() {
return name;
}
public List<Node> childNodes() {
return EMPTY_LIST;
}
public RubySymbol getSymbol(Ruby runtime) {
RubySymbol sym;
if ((sym = symbol) != null) return sym;
return symbol = runtime.fastNewSymbol(name);
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
return getSymbol(runtime);
}
@Override
public IRubyObject when(WhenNode whenNode, IRubyObject value, ThreadContext context, Ruby runtime, IRubyObject self, Block aBlock) {
if (value == null) whenNode.interpret(runtime, context, self, aBlock);
if (value instanceof RubySymbol && ((RubySymbol) value).asJavaString() == name) {
return whenNode.interpret(runtime, context, self, aBlock);
}
return null;
}
}