/*
***** 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"),
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package org.jruby.ast;
import java.util.List;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.evaluator.Instruction;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.CallSite;
import org.jruby.runtime.MethodIndex;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* Represents a when condition
*/
public class WhenNode extends Node {
private final Node expressionNodes;
private final Node bodyNode;
private final Node nextCase;
public final CallSite eqq = MethodIndex.getFunctionalCallSite("===");
public WhenNode(ISourcePosition position, Node expressionNodes, Node bodyNode, Node nextCase) {
super(position, NodeType.WHENNODE);
this.expressionNodes = expressionNodes;
assert bodyNode != null : "bodyNode is not null";
this.bodyNode = bodyNode;
this.nextCase = nextCase;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
public Instruction accept(NodeVisitor iVisitor) {
return iVisitor.visitWhenNode(this);
}
/**
* Gets the bodyNode.
* @return Returns a INode
*/
public Node getBodyNode() {
return bodyNode;
}
/**
* Gets the next case node (if any).
*/
public Node getNextCase() {
return nextCase;
}
/**
* Get the expressionNode(s).
*/
public Node getExpressionNodes() {
return expressionNodes;
}
public List<Node> childNodes() {
return Node.createList(expressionNodes, bodyNode, nextCase);
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
return bodyNode.interpret(runtime, context, self, aBlock);
}
// Ruby grammar has nested whens in a case body because of productions case_body and when_args.
@Override
public IRubyObject when(WhenNode whenNode, IRubyObject value, ThreadContext context, Ruby runtime, IRubyObject self, Block aBlock) {
RubyArray expressions = RuntimeHelpers.splatValue(expressionNodes.interpret(runtime, context, self, aBlock));
for (int j = 0,k = expressions.getLength(); j < k; j++) {
IRubyObject test = expressions.eltInternal(j);
if ((value != null && eqq.call(context, self, test, value).isTrue())
|| (value == null && test.isTrue())) {
return whenNode.interpret(runtime, context, self, aBlock);
}
}
return null;
}
}