| /* |
| * Copyright 2008 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.jjs.impl.gflow.unreachable; |
| |
| import com.google.gwt.dev.jjs.ast.Context; |
| import com.google.gwt.dev.jjs.ast.JLabeledStatement; |
| import com.google.gwt.dev.jjs.ast.JModVisitor; |
| import com.google.gwt.dev.jjs.ast.JNode; |
| |
| final class DeleteNodeVisitor extends JModVisitor { |
| public static boolean delete(JNode node, JNode parentNode) { |
| DeleteNodeVisitor visitor = new DeleteNodeVisitor(node); |
| visitor.accept(parentNode); |
| return visitor.didChange(); |
| } |
| |
| private final JNode node; |
| |
| public DeleteNodeVisitor(JNode node) { |
| this.node = node; |
| } |
| |
| @Override |
| public boolean visit(JLabeledStatement x, Context ctx) { |
| if (!super.visit(x, ctx)) { |
| return false; |
| } |
| |
| if (x.getBody() == node) { |
| // Remove node with its label. |
| ctx.removeMe(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean visit(JNode x, Context ctx) { |
| if (didChange()) { |
| return false; |
| } |
| |
| if (x == node) { |
| ctx.removeMe(); |
| return false; |
| } |
| |
| return true; |
| } |
| } |