1 /* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package jdk.nashorn.internal.ir; 26 27 import jdk.nashorn.internal.ir.visitor.NodeVisitor; 28 29 30 /** 31 * Interface for nodes that can be part of the lexical context. 32 * @see LexicalContext 33 */ 34 public interface LexicalContextNode { 35 /** 36 * Accept function for the node given a lexical context. It must be prepared 37 * to replace itself if present in the lexical context 38 * 39 * @param lc lexical context 40 * @param visitor node visitor 41 * 42 * @return new node or same node depending on state change 43 */ 44 Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor); 45 46 // Would be a default method on Java 8 47 /** 48 * Helper class for accept for items of this lexical context, delegates to the 49 * subclass accept and makes sure that the node is on the context before accepting 50 * and gets popped after accepting (and that the stack is consistent in that the 51 * node has been replaced with the possible new node resulting in visitation) 52 */ 53 static class Acceptor { 54 static Node accept(final LexicalContextNode node, final NodeVisitor<? extends LexicalContext> visitor) { 55 final LexicalContext lc = visitor.getLexicalContext(); 56 lc.push(node); 57 final Node newNode = node.accept(lc, visitor); 58 return lc.pop(newNode); 59 } 60 } 61 }