/*

***** BEGIN LICENSE BLOCK *****

* Version: EPL 1.0/GPL 2.0/LGPL 2.1

*

* The contents of this file are subject to the Eclipse 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/epl-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 Benoit Cerrina <b.cerrina@wanadoo.fr>

* Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>

* Copyright (C) 2002 Anders Bengtsson <ndrsbngtssn@yahoo.se>

* Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>

* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>

*

* 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 EPL, 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 EPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby.ast;

import java.util.List;

import org.jruby.MetaClass;

import org.jruby.Ruby;

import org.jruby.RubyModule;

import org.jruby.ast.types.INameNode;

import org.jruby.ast.visitor.NodeVisitor;

import org.jruby.common.IRubyWarnings.ID;

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

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

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

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;

/**

* method definition node.

*/

public class DefnNode extends MethodDefNode implements INameNode {

public DefnNode(ISourcePosition position, ArgumentNode nameNode, ArgsNode argsNode,

StaticScope scope, Node bodyNode) {

super(position, nameNode, argsNode, scope, bodyNode);

}

public NodeType getNodeType() {

return NodeType.DEFNNODE;

}

public Object accept(NodeVisitor iVisitor) {

return iVisitor.visitDefnNode(this);

}

/**

* Get the name of this method

*/

@Override

public String getName() {

return nameNode.getName();

}

public List<Node> childNodes() {

return Node.createList(nameNode, argsNode, bodyNode);

}

@Override

public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {

RubyModule containingClass = context.getRubyClass();

if (containingClass == runtime.getDummy()) {

throw runtime.newTypeError("no class/module to add method");

}

String name = getName();

if (containingClass == runtime.getObject() && name == "initialize") {

runtime.getWarnings().warn(ID.REDEFINING_DANGEROUS, "redefining Object#initialize may cause infinite loop");

}

if (name == "__id__" || name == "__send__") {

runtime.getWarnings().warn(ID.REDEFINING_DANGEROUS, "redefining `" + name + "' may cause serious problem");

}

Visibility visibility = context.getCurrentVisibility();

if (name == "initialize" || name == "initialize_copy" || visibility == Visibility.MODULE_FUNCTION) {

visibility = Visibility.PRIVATE;

}

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, containingClass, name, scope, body, argsNode,

visibility, getPosition());

containingClass.addMethod(name, newMethod);

if (context.getCurrentVisibility() == Visibility.MODULE_FUNCTION) {

containingClass.getSingletonClass().addMethod(name,

new WrapperMethod(containingClass.getSingletonClass(), newMethod, Visibility.PUBLIC));

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

}

// 'class << state.self' and 'class << obj' uses defn as opposed to defs

if (containingClass.isSingleton()) {

((MetaClass) containingClass).getAttached().callMethod(context,

"singleton_method_added", runtime.fastNewSymbol(name));

} else {

containingClass.callMethod(context, "method_added", runtime.fastNewSymbol(name));

}

return runtime.getNil();

}

}