/*
***** 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 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2004-2006 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.ast.visitor.NodeVisitor;
import org.jruby.evaluator.Instruction;
import org.jruby.exceptions.JumpException;
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.SharedScopeBlock;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* A 'for' statement. This is implemented using iter and that is how MRI does things,
* but 'for's do not have their own stack, so doing this way is mildly painful.
*
* @see IterNode
*/
public class ForNode extends IterNode {
public final CallSite callAdapter = MethodIndex.getCallSite("each");
private Node iterNode;
public ForNode(ISourcePosition position, Node varNode, Node bodyNode, Node iterNode) {
// For nodes do not have their own scope so we pass null to indicate this.
// 'For's are implemented as blocks in evaluation, but they have no scope so we
// just deal with this lack of scope throughout its lifespan. We should probably
// change the way this works to get rid of multiple null checks.
super(position, varNode, null, bodyNode, NodeType.FORNODE);
assert iterNode != null : "iterNode is not null";
this.iterNode = iterNode;
}
public Node getIterNode() {
return iterNode;
}
/**
* Accept for the visitor pattern.
* @param iVisitor the visitor
**/
@Override
public Instruction accept(NodeVisitor iVisitor) {
return iVisitor.visitForNode(this);
}
@Override
public List<Node> childNodes() {
return Node.createList(getVarNode(), getBodyNode(), iterNode);
}
@Override
public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
Block block = SharedScopeBlock.newInterpretedSharedScopeClosure(context, this, context.getCurrentScope(), self);
try {
while (true) {
try {
String savedFile = context.getFile();
int savedLine = context.getLine();
IRubyObject recv = null;
try {
recv = iterNode.interpret(runtime, context, self, aBlock);
} finally {
context.setFileAndLine(savedFile, savedLine);
}
return callAdapter.call(context, self, recv, block);
} catch (JumpException.RetryJump rj) {
// do nothing, allow loop to retry
}
}
} catch (JumpException.BreakJump bj) {
return (IRubyObject) bj.getValue();
}
}
}