1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/boot-script/src/main/java/net/java/html/boot/script/ScriptPresenter.java Tue Jun 03 20:56:36 2014 +0200
1.3 @@ -0,0 +1,244 @@
1.4 +/**
1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
1.6 + *
1.7 + * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.
1.8 + *
1.9 + * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
1.10 + * Other names may be trademarks of their respective owners.
1.11 + *
1.12 + * The contents of this file are subject to the terms of either the GNU
1.13 + * General Public License Version 2 only ("GPL") or the Common
1.14 + * Development and Distribution License("CDDL") (collectively, the
1.15 + * "License"). You may not use this file except in compliance with the
1.16 + * License. You can obtain a copy of the License at
1.17 + * http://www.netbeans.org/cddl-gplv2.html
1.18 + * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
1.19 + * specific language governing permissions and limitations under the
1.20 + * License. When distributing the software, include this License Header
1.21 + * Notice in each file and include the License file at
1.22 + * nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this
1.23 + * particular file as subject to the "Classpath" exception as provided
1.24 + * by Oracle in the GPL Version 2 section of the License file that
1.25 + * accompanied this code. If applicable, add the following below the
1.26 + * License Header, with the fields enclosed by brackets [] replaced by
1.27 + * your own identifying information:
1.28 + * "Portions Copyrighted [year] [name of copyright owner]"
1.29 + *
1.30 + * Contributor(s):
1.31 + *
1.32 + * The Original Software is NetBeans. The Initial Developer of the Original
1.33 + * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.
1.34 + *
1.35 + * If you wish your version of this file to be governed by only the CDDL
1.36 + * or only the GPL Version 2, indicate your decision by adding
1.37 + * "[Contributor] elects to include this software in this distribution
1.38 + * under the [CDDL or GPL Version 2] license." If you do not indicate a
1.39 + * single choice of license, a recipient has the option to distribute
1.40 + * your version of this file under either the CDDL, the GPL Version 2 or
1.41 + * to extend the choice of license to its licensees as provided above.
1.42 + * However, if you add GPL Version 2 code and therefore, elected the GPL
1.43 + * Version 2 license, then the option applies only if the new code is
1.44 + * made subject to such option by the copyright holder.
1.45 + */
1.46 +package net.java.html.boot.script;
1.47 +
1.48 +import java.io.Reader;
1.49 +import java.net.URL;
1.50 +import java.util.ArrayList;
1.51 +import java.util.Arrays;
1.52 +import java.util.List;
1.53 +import java.util.logging.Level;
1.54 +import java.util.logging.Logger;
1.55 +import javax.script.Invocable;
1.56 +import javax.script.ScriptEngine;
1.57 +import javax.script.ScriptEngineManager;
1.58 +import javax.script.ScriptException;
1.59 +import org.apidesign.html.boot.spi.Fn;
1.60 +import org.apidesign.html.boot.spi.Fn.Presenter;
1.61 +
1.62 +/** Implementation of {@link Presenter} that delegates
1.63 + * to Java {@link ScriptEngine scripting} API. The presenter runs headless
1.64 + * without appropriate simulation of browser APIs. Its primary usefulness
1.65 + * is inside testing environments.
1.66 + * <p>
1.67 + * One can load in browser simulation for example from
1.68 + * <a href="http://www.envjs.com/">env.js</a>. The best way to achieve so,
1.69 + * is to add dependency on XXX
1.70 + *
1.71 + *
1.72 + * @author Jaroslav Tulach
1.73 + */
1.74 +public final class ScriptPresenter implements Presenter, Fn.FromJavaScript, Fn.ToJavaScript {
1.75 + private final ScriptEngine eng;
1.76 +
1.77 + public ScriptPresenter() {
1.78 + try {
1.79 + eng = new ScriptEngineManager().getEngineByName("javascript");
1.80 + eng.eval("function alert(msg) { Packages.java.lang.System.out.println(msg); };");
1.81 + } catch (ScriptException ex) {
1.82 + throw new IllegalStateException(ex);
1.83 + }
1.84 + }
1.85 +
1.86 + @Override
1.87 + public Fn defineFn(String code, String... names) {
1.88 + return defineImpl(code, names);
1.89 + }
1.90 + private FnImpl defineImpl(String code, String... names) {
1.91 + StringBuilder sb = new StringBuilder();
1.92 + sb.append("(function() {");
1.93 + sb.append(" return function(");
1.94 + String sep = "";
1.95 + if (names != null) for (String n : names) {
1.96 + sb.append(sep).append(n);
1.97 + sep = ",";
1.98 + }
1.99 + sb.append(") {\n");
1.100 + sb.append(code);
1.101 + sb.append("};");
1.102 + sb.append("})()");
1.103 +
1.104 + final Object fn;
1.105 + try {
1.106 + fn = eng.eval(sb.toString());
1.107 + } catch (ScriptException ex) {
1.108 + throw new IllegalStateException(ex);
1.109 + }
1.110 + return new FnImpl(this, fn);
1.111 + }
1.112 +
1.113 + @Override
1.114 + public void displayPage(URL page, Runnable onPageLoad) {
1.115 + // not really displaying anything
1.116 + if (onPageLoad != null) {
1.117 + onPageLoad.run();
1.118 + }
1.119 + }
1.120 +
1.121 + @Override
1.122 + public void loadScript(Reader code) throws Exception {
1.123 + eng.eval(code);
1.124 + }
1.125 +
1.126 + //
1.127 + // array conversions
1.128 + //
1.129 +
1.130 + final Object convertArrays(Object[] arr) throws Exception {
1.131 + for (int i = 0; i < arr.length; i++) {
1.132 + if (arr[i] instanceof Object[]) {
1.133 + arr[i] = convertArrays((Object[]) arr[i]);
1.134 + }
1.135 + }
1.136 + final Object wrapArr = wrapArrFn().invokeImpl(null, false, arr); // NOI18N
1.137 + return wrapArr;
1.138 + }
1.139 +
1.140 + private FnImpl wrapArrImpl;
1.141 + private FnImpl wrapArrFn() {
1.142 + if (wrapArrImpl == null) {
1.143 + try {
1.144 + wrapArrImpl = defineImpl("return Array.prototype.slice.call(arguments);");
1.145 + } catch (Exception ex) {
1.146 + throw new IllegalStateException(ex);
1.147 + }
1.148 + }
1.149 + return wrapArrImpl;
1.150 + }
1.151 +
1.152 + final Object checkArray(Object val) throws Exception {
1.153 + final FnImpl fn = arraySizeFn();
1.154 + final Object fnRes = fn.invokeImpl(null, false, val, null);
1.155 + int length = ((Number) fnRes).intValue();
1.156 + if (length == -1) {
1.157 + return val;
1.158 + }
1.159 + Object[] arr = new Object[length];
1.160 + fn.invokeImpl(null, false, val, arr);
1.161 + return arr;
1.162 + }
1.163 + private FnImpl arraySize;
1.164 + private FnImpl arraySizeFn() {
1.165 + if (arraySize == null) {
1.166 + try {
1.167 + arraySize = defineImpl("\n"
1.168 + + "if (to === null) {\n"
1.169 + + " if (Object.prototype.toString.call(arr) === '[object Array]') return arr.length;\n"
1.170 + + " else return -1;\n"
1.171 + + "} else {\n"
1.172 + + " var l = arr.length;\n"
1.173 + + " for (var i = 0; i < l; i++) to[i] = arr[i];\n"
1.174 + + " return l;\n"
1.175 + + "}", "arr", "to"
1.176 + );
1.177 + } catch (Exception ex) {
1.178 + throw new IllegalStateException(ex);
1.179 + }
1.180 + }
1.181 + return arraySize;
1.182 + }
1.183 +
1.184 + @Override
1.185 + public Object toJava(Object jsArray) {
1.186 + try {
1.187 + return checkArray(jsArray);
1.188 + } catch (Exception ex) {
1.189 + throw new IllegalStateException(ex);
1.190 + }
1.191 + }
1.192 +
1.193 + @Override
1.194 + public Object toJavaScript(Object toReturn) {
1.195 + if (toReturn instanceof Object[]) {
1.196 + try {
1.197 + return convertArrays((Object[])toReturn);
1.198 + } catch (Exception ex) {
1.199 + throw new IllegalStateException(ex);
1.200 + }
1.201 + } else {
1.202 + return toReturn;
1.203 + }
1.204 + }
1.205 +
1.206 + private class FnImpl extends Fn {
1.207 +
1.208 + private final Object fn;
1.209 +
1.210 + public FnImpl(Presenter presenter, Object fn) {
1.211 + super(presenter);
1.212 + this.fn = fn;
1.213 + }
1.214 +
1.215 + @Override
1.216 + public Object invoke(Object thiz, Object... args) throws Exception {
1.217 + return invokeImpl(thiz, true, args);
1.218 + }
1.219 +
1.220 + final Object invokeImpl(Object thiz, boolean arrayChecks, Object... args) throws Exception {
1.221 + List<Object> all = new ArrayList<Object>(args.length + 1);
1.222 + all.add(thiz == null ? fn : thiz);
1.223 + for (int i = 0; i < args.length; i++) {
1.224 + if (arrayChecks) {
1.225 + if (args[i] instanceof Object[]) {
1.226 + Object[] arr = (Object[]) args[i];
1.227 + Object conv = ((ScriptPresenter)presenter()).convertArrays(arr);
1.228 + args[i] = conv;
1.229 + }
1.230 + if (args[i] instanceof Character) {
1.231 + args[i] = (int)((Character)args[i]);
1.232 + }
1.233 + }
1.234 + all.add(args[i]);
1.235 + }
1.236 + Object ret = ((Invocable)eng).invokeMethod(fn, "call", all.toArray()); // NOI18N
1.237 + if (ret == fn) {
1.238 + return null;
1.239 + }
1.240 + if (!arrayChecks) {
1.241 + return ret;
1.242 + }
1.243 + return ((ScriptPresenter)presenter()).checkArray(ret);
1.244 + }
1.245 + }
1.246 +
1.247 +}