/*

***** 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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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.internal.runtime.methods.DynamicMethod;

import org.jruby.internal.runtime.methods.DynamicMethodFactory;

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);

assert receiverNode != null : "receiverNode is not null";

this.receiverNode = receiverNode;

}

public NodeType getNodeType() {

return NodeType.DEFSNODE;

}

/**

* Accept for the visitor pattern.

* @param iVisitor the visitor

**/

public Object 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;

DynamicMethod newMethod = DynamicMethodFactory.newDefaultMethod(

runtime, rubyClass, name, scope, body, argsNode,

Visibility.PUBLIC, getPosition());

rubyClass.addMethod(name, newMethod);

receiver.callMethod(context, "singleton_method_added", runtime.fastNewSymbol(name));

return runtime.getNil();

}

}