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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.util.Enumeration;
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import javax.script.Invocable;
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import javax.script.ScriptContext;
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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 static org.testng.Assert.*;
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public final class TestVM {
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private final Invocable code;
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private final CharSequence codeSeq;
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private final Object bck2brwsr;
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private BytesLoader resources;
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private TestVM(Invocable code, CharSequence codeSeq) throws ScriptException, NoSuchMethodException {
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this.code = code;
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this.codeSeq = codeSeq;
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this.bck2brwsr = ((ScriptEngine)code).eval("bck2brwsr(function(n) { return loader.get(n); })");
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((ScriptEngine)code).getContext().setAttribute("loader", this, ScriptContext.ENGINE_SCOPE);
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}
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public void register(BytesLoader res) {
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this.resources = res;
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}
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public byte[] get(String res) throws IOException {
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return resources != null ? resources.get(res) : null;
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}
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public Object execCode(
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String msg, Class<?> clazz, String method,
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Object expRes, Object... args
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) throws Exception {
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Object ret = null;
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try {
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ret = code.invokeMethod(bck2brwsr, "loadClass", clazz.getName());
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ret = code.invokeMethod(ret, method, args);
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} catch (ScriptException ex) {
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fail("Execution failed in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
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} catch (NoSuchMethodException ex) {
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fail("Cannot find method in " + dumpJS(codeSeq), ex);
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}
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if (ret == null && expRes == null) {
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return null;
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}
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if (expRes != null && expRes.equals(ret)) {
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return null;
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}
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if (expRes instanceof Number) {
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// in case of Long it is necessary convert it to number
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// since the Long is represented by two numbers in JavaScript
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try {
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final Object toFP = ((ScriptEngine)code).eval("Number.prototype.toFP");
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if (ret instanceof Long) {
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ret = code.invokeMethod(toFP, "call", ret);
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}
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ret = code.invokeFunction("Number", ret);
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} catch (ScriptException ex) {
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fail("Conversion to number failed in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
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} catch (NoSuchMethodException ex) {
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fail("Cannot find global Number(x) function in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
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}
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}
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return ret;
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}
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void assertExec(
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String msg, Class clazz, String method, Object expRes, Object... args
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) throws Exception {
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Object ret = execCode(msg, clazz, method, expRes, args);
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if (ret == null) {
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return;
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}
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if (expRes instanceof Integer && ret instanceof Double) {
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expRes = ((Integer)expRes).doubleValue();
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}
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if (expRes != null && expRes.equals(ret)) {
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return;
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}
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assertEquals(ret, expRes, msg + "was: " + ret + "\n" + dumpJS(codeSeq));
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}
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static TestVM compileClass(String... names) throws ScriptException, IOException {
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return compileClass(null, names);
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}
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static TestVM compileClass(StringBuilder sb, String... names) throws ScriptException, IOException {
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return compileClass(sb, null, names);
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}
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static TestVM compileClass(StringBuilder sb, ScriptEngine[] eng, String... names) throws ScriptException, IOException {
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if (sb == null) {
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sb = new StringBuilder();
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}
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Bck2Brwsr.generate(sb, new EmulationResources(), names);
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ScriptEngineManager sem = new ScriptEngineManager();
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ScriptEngine js = sem.getEngineByExtension("js");
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if (eng != null) {
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eng[0] = js;
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}
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try {
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Object res = js.eval(sb.toString());
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assertTrue(js instanceof Invocable, "It is invocable object: " + res);
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return new TestVM((Invocable) js, sb);
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} catch (Exception ex) {
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if (sb.length() > 2000) {
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sb = dumpJS(sb);
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}
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fail("Could not evaluate:" + ex.getClass() + ":" + ex.getMessage() + "\n" + sb, ex);
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return null;
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}
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}
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Object loadClass(String loadClass, String name) throws ScriptException, NoSuchMethodException {
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return code.invokeMethod(bck2brwsr, "loadClass", Exceptions.class.getName());
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}
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Object invokeMethod(Object obj, String method, Object... params) throws ScriptException, NoSuchMethodException {
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return code.invokeMethod(obj, method, params);
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}
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Object invokeFunction(String methodName, Object... args) throws ScriptException, NoSuchMethodException {
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return code.invokeFunction(methodName, args);
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}
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static StringBuilder dumpJS(CharSequence sb) throws IOException {
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File f = File.createTempFile("execution", ".js");
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FileWriter w = new FileWriter(f);
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w.append(sb);
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w.close();
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return new StringBuilder(f.getPath());
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}
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@Override
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public String toString() {
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try {
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return dumpJS(codeSeq).toString();
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} catch (IOException ex) {
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return ex.toString();
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}
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}
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final CharSequence codeSeq() {
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return codeSeq;
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}
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private static class EmulationResources implements Bck2Brwsr.Resources {
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@Override
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public InputStream get(String name) throws IOException {
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if ("java/net/URI.class".equals(name)) {
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// skip
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return null;
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}
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if ("java/net/URLConnection.class".equals(name)) {
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// skip
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return null;
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}
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if ("java/lang/System.class".equals(name)) {
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// skip
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return null;
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}
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Enumeration<URL> en = StaticMethodTest.class.getClassLoader().getResources(name);
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URL u = null;
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while (en.hasMoreElements()) {
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u = en.nextElement();
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}
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if (u == null) {
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throw new IOException("Can't find " + name);
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}
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if (u.toExternalForm().contains("rt.jar!")) {
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throw new IOException("No emulation for " + u);
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}
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return u.openStream();
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}
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}
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}
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