/*
***** 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) 2002-2004 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
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* decision by deleting the provisions above and replace them with the notice
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***** END LICENSE BLOCK *****/
package org.jruby.ast;
import java.util.List;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubySymbol;
import org.jruby.ast.types.INameNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.evaluator.Instruction;
import org.jruby.internal.runtime.methods.DefaultMethod;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.parser.StaticScope;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;
/**
* Represents a singleton method definition.
*/
public class DefsNode extends MethodDefNode implements INameNode {
private final Node receiverNode;
public DefsNode(ISourcePosition position, Node receiverNode, ArgumentNode nameNode, ArgsNode argsNode,
StaticScope scope, Node bodyNode) {
super(position, nameNode, argsNode, scope, bodyNode, NodeType.DEFSNODE);
assert receiverNode != null : "receiverNode is not null";
this.receiverNode = receiverNode;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
public Instruction accept(NodeVisitor iVisitor) {
return iVisitor.visitDefsNode(this);
}
/**
* Gets the receiverNode.
* @return Returns a Node
*/
public Node getReceiverNode() {
return receiverNode;
}
/**
* Gets the name of this method
*/
@Override
public String getName() {
return nameNode.getName();
}
public List<Node> childNodes() {
return Node.createList(receiverNode, nameNode, argsNode, bodyNode);
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
IRubyObject receiver = receiverNode.interpret(runtime,context, self, aBlock);
String name = getName();
if (runtime.getSafeLevel() >= 4 && !receiver.isTaint()) {
throw runtime.newSecurityError("Insecure; can't define singleton method.");
}
if (receiver instanceof RubyFixnum || receiver instanceof RubySymbol) {
throw runtime.newTypeError("can't define singleton method \"" + name
+ "\" for " + receiver.getMetaClass().getBaseName());
}
if (receiver.isFrozen()) throw runtime.newFrozenError("object");
RubyClass rubyClass = receiver.getSingletonClass();
if (runtime.getSafeLevel() >= 4 && rubyClass.getMethods().get(name) != null) {
throw runtime.newSecurityError("redefining method prohibited.");
}
scope.determineModule();
// Make a nil node if no body. Notice this is not part of AST.
Node body = bodyNode == null ? new NilNode(getPosition()) : bodyNode;
DefaultMethod newMethod = new DefaultMethod(rubyClass, scope, body, argsNode,
Visibility.PUBLIC, getPosition());
rubyClass.addMethod(name, newMethod);
receiver.callMethod(context, "singleton_method_added", runtime.fastNewSymbol(name));
return runtime.getNil();
}
}