| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.nashorn.internal.ir; |
| |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| |
| /** |
| * Interface for nodes that can be part of the lexical context. |
| * @see LexicalContext |
| */ |
| public interface LexicalContextNode { |
| /** |
| * Accept function for the node given a lexical context. It must be prepared |
| * to replace itself if present in the lexical context |
| * |
| * @param lc lexical context |
| * @param visitor node visitor |
| * |
| * @return new node or same node depending on state change |
| */ |
| Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor); |
| |
| // Would be a default method on Java 8 |
| /** |
| * Helper class for accept for items of this lexical context, delegates to the |
| * subclass accept and makes sure that the node is on the context before accepting |
| * and gets popped after accepting (and that the stack is consistent in that the |
| * node has been replaced with the possible new node resulting in visitation) |
| */ |
| static class Acceptor { |
| static Node accept(final LexicalContextNode node, final NodeVisitor<? extends LexicalContext> visitor) { |
| final LexicalContext lc = visitor.getLexicalContext(); |
| lc.push(node); |
| final LexicalContextNode newNode = (LexicalContextNode)node.accept(lc, visitor); |
| return (Node)lc.pop(newNode); |
| } |
| } |
| } |