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/**
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
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*
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* Oracle and Java are registered trademarks of Oracle and/or its affiliates.
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* Other names may be trademarks of their respective owners.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common
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* Development and Distribution License("CDDL") (collectively, the
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* "License"). You may not use this file except in compliance with the
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* License. You can obtain a copy of the License at
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* http://www.netbeans.org/cddl-gplv2.html
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* or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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* specific language governing permissions and limitations under the
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* License. When distributing the software, include this License Header
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* Notice in each file and include the License file at
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* nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the GPL Version 2 section of the License file that
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* accompanied this code. If applicable, add the following below the
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* License Header, with the fields enclosed by brackets [] replaced by
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* your own identifying information:
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* "Portions Copyrighted [year] [name of copyright owner]"
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*
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* Contributor(s):
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*
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* The Original Software is NetBeans. The Initial Developer of the Original
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* Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
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*
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* If you wish your version of this file to be governed by only the CDDL
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* or only the GPL Version 2, indicate your decision by adding
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* "[Contributor] elects to include this software in this distribution
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* under the [CDDL or GPL Version 2] license." If you do not indicate a
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* single choice of license, a recipient has the option to distribute
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* your version of this file under either the CDDL, the GPL Version 2 or
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* to extend the choice of license to its licensees as provided above.
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* However, if you add GPL Version 2 code and therefore, elected the GPL
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* Version 2 license, then the option applies only if the new code is
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* made subject to such option by the copyright holder.
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*/
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package net.java.html.boot.script;
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import java.io.Closeable;
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import java.io.IOException;
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import java.io.Reader;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.Executor;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import org.netbeans.html.boot.spi.Fn;
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import org.netbeans.html.boot.spi.Fn.Presenter;
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/** Implementation of {@link Presenter} that delegates
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* to Java {@link ScriptEngine scripting} API. The presenter runs headless
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* without appropriate simulation of browser APIs. Its primary usefulness
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* is inside testing environments.
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* <p>
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* One can load in browser simulation for example from
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* <a href="http://www.envjs.com/">env.js</a>. The best way to achieve so,
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* is to wait until JDK-8046013 gets fixed....
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*
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*
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* @author Jaroslav Tulach
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*/
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final class ScriptPresenter
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implements Presenter, Fn.FromJavaScript, Fn.ToJavaScript, Executor {
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private static final Logger LOG = Logger.getLogger(ScriptPresenter.class.getName());
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private final ScriptEngine eng;
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private final Executor exc;
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public ScriptPresenter(Executor exc) {
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this.exc = exc;
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try {
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eng = new ScriptEngineManager().getEngineByName("javascript");
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eng.eval("function alert(msg) { Packages.java.lang.System.out.println(msg); };");
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eng.eval("function confirm(msg) { Packages.java.lang.System.out.println(msg); return true; };");
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eng.eval("function prompt(msg, txt) { Packages.java.lang.System.out.println(msg + ':' + txt); return txt; };");
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} catch (ScriptException ex) {
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throw new IllegalStateException(ex);
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}
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}
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@Override
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public Fn defineFn(String code, String... names) {
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return defineImpl(code, names);
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}
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private FnImpl defineImpl(String code, String... names) {
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StringBuilder sb = new StringBuilder();
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sb.append("(function() {");
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sb.append(" return function(");
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String sep = "";
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if (names != null) for (String n : names) {
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sb.append(sep).append(n);
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sep = ",";
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}
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sb.append(") {\n");
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sb.append(code);
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sb.append("};");
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sb.append("})()");
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final Object fn;
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try {
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fn = eng.eval(sb.toString());
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} catch (ScriptException ex) {
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throw new IllegalStateException(ex);
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}
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return new FnImpl(this, fn);
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}
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@Override
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public void displayPage(URL page, Runnable onPageLoad) {
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try {
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eng.eval("if (typeof window !== 'undefined') window.location = '" + page + "'");
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} catch (ScriptException ex) {
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LOG.log(Level.SEVERE, "Cannot load " + page, ex);
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}
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if (onPageLoad != null) {
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onPageLoad.run();
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}
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}
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@Override
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public void loadScript(Reader code) throws Exception {
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eng.eval(code);
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}
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//
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// array conversions
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//
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final Object convertArrays(Object[] arr) throws Exception {
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for (int i = 0; i < arr.length; i++) {
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if (arr[i] instanceof Object[]) {
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arr[i] = convertArrays((Object[]) arr[i]);
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}
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}
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final Object wrapArr = wrapArrFn().invokeImpl(null, false, arr); // NOI18N
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return wrapArr;
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}
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private FnImpl wrapArrImpl;
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private FnImpl wrapArrFn() {
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if (wrapArrImpl == null) {
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try {
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wrapArrImpl = defineImpl("return Array.prototype.slice.call(arguments);");
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} catch (Exception ex) {
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throw new IllegalStateException(ex);
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}
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}
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return wrapArrImpl;
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}
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final Object checkArray(Object val) throws Exception {
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final FnImpl fn = arraySizeFn();
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final Object fnRes = fn.invokeImpl(null, false, val, null);
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int length = ((Number) fnRes).intValue();
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if (length == -1) {
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return val;
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}
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Object[] arr = new Object[length];
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fn.invokeImpl(null, false, val, arr);
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return arr;
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}
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private FnImpl arraySize;
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private FnImpl arraySizeFn() {
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if (arraySize == null) {
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try {
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arraySize = defineImpl("\n"
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+ "if (to === null) {\n"
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+ " if (Object.prototype.toString.call(arr) === '[object Array]') return arr.length;\n"
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+ " else return -1;\n"
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+ "} else {\n"
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+ " var l = arr.length;\n"
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+ " for (var i = 0; i < l; i++) to[i] = arr[i];\n"
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+ " return l;\n"
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+ "}", "arr", "to"
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);
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} catch (Exception ex) {
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throw new IllegalStateException(ex);
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}
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}
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return arraySize;
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}
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@Override
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public Object toJava(Object jsArray) {
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try {
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return checkArray(jsArray);
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} catch (Exception ex) {
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throw new IllegalStateException(ex);
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}
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}
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@Override
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public Object toJavaScript(Object toReturn) {
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if (toReturn instanceof Object[]) {
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try {
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return convertArrays((Object[])toReturn);
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} catch (Exception ex) {
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throw new IllegalStateException(ex);
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}
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} else {
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return toReturn;
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}
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}
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@Override
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public void execute(final Runnable command) {
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if (Fn.activePresenter() == this) {
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command.run();
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return;
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}
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class Wrap implements Runnable {
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public void run() {
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try (Closeable c = Fn.activate(ScriptPresenter.this)) {
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command.run();
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} catch (IOException ex) {
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throw new IllegalStateException(ex);
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}
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}
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}
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final Runnable wrap = new Wrap();
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if (exc == null) {
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wrap.run();
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} else {
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exc.execute(wrap);
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}
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}
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private class FnImpl extends Fn {
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private final Object fn;
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public FnImpl(Presenter presenter, Object fn) {
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super(presenter);
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this.fn = fn;
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}
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@Override
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public Object invoke(Object thiz, Object... args) throws Exception {
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return invokeImpl(thiz, true, args);
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}
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final Object invokeImpl(Object thiz, boolean arrayChecks, Object... args) throws Exception {
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List<Object> all = new ArrayList<>(args.length + 1);
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all.add(thiz == null ? fn : thiz);
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for (int i = 0; i < args.length; i++) {
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if (arrayChecks) {
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if (args[i] instanceof Object[]) {
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Object[] arr = (Object[]) args[i];
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Object conv = ((ScriptPresenter)presenter()).convertArrays(arr);
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args[i] = conv;
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}
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if (args[i] instanceof Character) {
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args[i] = (int)((Character)args[i]);
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}
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}
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all.add(args[i]);
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}
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Object ret = ((Invocable)eng).invokeMethod(fn, "call", all.toArray()); // NOI18N
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if (ret == fn) {
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return null;
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}
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if (!arrayChecks) {
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return ret;
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}
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return ((ScriptPresenter)presenter()).checkArray(ret);
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}
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}
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}
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