2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.vm4brwsr;
20 import java.io.BufferedWriter;
22 import java.io.FileWriter;
23 import java.io.IOException;
24 import java.io.Writer;
26 import java.net.URISyntaxException;
28 import java.util.Enumeration;
29 import java.util.jar.JarEntry;
30 import java.util.jar.JarFile;
32 /** Generator of JavaScript from bytecode of classes on classpath of the VM
35 * @author Jaroslav Tulach <jtulach@netbeans.org>
40 public static void main(String... args) throws IOException, URISyntaxException {
41 final String obfuscate = "--obfuscatelevel";
42 final String extension = "--createextension";
44 if (args.length < 2) {
45 System.err.println("Bck2Brwsr Translator from Java(tm) to JavaScript, (c) Jaroslav Tulach 2012");
46 System.err.print("Usage: java -cp ... -jar ... [");
47 System.err.print(obfuscate);
48 System.err.print(" [");
50 for (ObfuscationLevel l : ObfuscationLevel.values()) {
52 System.err.print('|');
54 System.err.print(l.name());
57 System.err.print("]] [");
58 System.err.print(extension);
59 System.err.println("] <file_to_generate_js_code_to> java/lang/Class org/your/App ...");
63 final ClassLoader mainClassLoader = Main.class.getClassLoader();
65 ObfuscationLevel obfLevel = ObfuscationLevel.NONE;
66 boolean createExtension = false;
67 StringArray classes = new StringArray();
68 String generateTo = null;
69 for (int i = 0; i < args.length; i++) {
70 if (obfuscate.equals(args[i])) { // NOI18N
73 obfLevel = ObfuscationLevel.valueOf(args[i]);
74 } catch (Exception e) {
75 System.err.print(obfuscate);
76 System.err.print(" parameter needs to be followed by one of ");
78 for (ObfuscationLevel l : ObfuscationLevel.values()) {
80 System.err.print(", ");
82 System.err.print(l.name());
90 if (extension.equals(args[i])) { // NOI18N
91 createExtension = true;
94 if (generateTo == null) {
97 collectClasses(classes, mainClassLoader, args[i]);
101 File gt = new File(generateTo);
102 if (Boolean.getBoolean("skip.if.exists") && gt.isFile()) {
103 System.err.println("Skipping as " + gt + " exists.");
107 try (Writer w = new BufferedWriter(new FileWriter(gt))) {
108 Bck2Brwsr.newCompiler().library(createExtension).
109 obfuscation(obfLevel).
110 addRootClasses(classes.toArray()).
111 resources(new LdrRsrcs(Main.class.getClassLoader(), true)).
116 private static void collectClasses(
117 final StringArray dest,
118 final ClassLoader cl, final String relativePath)
119 throws IOException, URISyntaxException {
120 final Enumeration<URL> urls = cl.getResources(relativePath);
121 if (!urls.hasMoreElements()) {
122 dest.add(relativePath);
126 final URL url = urls.nextElement();
127 switch (url.getProtocol()) {
129 collectClasses(dest, relativePath,
130 new File(new URI(url.toString())));
133 final String fullPath = url.getPath();
134 final int sepIndex = fullPath.indexOf('!');
135 final String jarFilePath =
136 (sepIndex != -1) ? fullPath.substring(0, sepIndex)
139 final URI jarUri = new URI(jarFilePath);
140 if (jarUri.getScheme().equals("file")) {
141 try (JarFile jarFile = new JarFile(new File(jarUri))) {
142 collectClasses(dest, relativePath, jarFile);
149 dest.add(relativePath);
150 } while (urls.hasMoreElements());
153 private static void collectClasses(final StringArray dest,
154 final String relativePath,
156 if (file.isDirectory()) {
157 final File[] subFiles = file.listFiles();
158 for (final File subFile: subFiles) {
160 extendPath(relativePath, subFile.getName()),
167 final String filePath = file.getPath();
168 if (filePath.endsWith(".class")) {
169 validateAndAddClass(dest, relativePath);
173 private static void collectClasses(final StringArray dest,
174 final String relativePath,
175 final JarFile jarFile) {
176 if (relativePath.endsWith(".class")) {
177 if (jarFile.getJarEntry(relativePath) != null) {
178 validateAndAddClass(dest, relativePath);
184 final String expectedPrefix =
185 relativePath.endsWith("/") ? relativePath
186 : relativePath + '/';
187 final Enumeration<JarEntry> entries = jarFile.entries();
188 while (entries.hasMoreElements()) {
189 final JarEntry entry = entries.nextElement();
190 if (!entry.isDirectory()) {
191 final String entryName = entry.getName();
192 if (entryName.startsWith(expectedPrefix)
193 && entryName.endsWith(".class")) {
194 validateAndAddClass(dest, entryName);
200 private static String extendPath(final String relativePath,
201 final String fileName) {
202 return relativePath.endsWith("/") ? relativePath + fileName
203 : relativePath + '/' + fileName;
206 private static void validateAndAddClass(final StringArray dest,
207 final String relativePath) {
208 final String className =
209 relativePath.substring(0, relativePath.length() - 6);
210 if (!className.endsWith("package-info")) {