1 package org.apidesign.vm4brwsr;
3 import java.io.BufferedWriter;
4 import java.io.FileWriter;
5 import java.io.IOException;
6 import java.io.InputStream;
9 import java.util.Arrays;
10 import java.util.Collections;
11 import java.util.Enumeration;
12 import java.util.HashMap;
13 import java.util.Iterator;
14 import java.util.LinkedList;
15 import java.util.List;
18 /** Generator of JavaScript from bytecode of classes on classpath of the VM.
20 * @author Jaroslav Tulach <jtulach@netbeans.org>
25 public static void main(String... args) throws IOException {
26 if (args.length < 2) {
27 System.err.println("Usage: java -cp ... -jar ... <file_to_generate_js_code_to> java/lang/Class org/your/App ...");
31 Writer w = new BufferedWriter(new FileWriter(args[0]));
32 List<String> classes = Arrays.asList(args).subList(1, args.length);
37 static void compile(Appendable out, String... names) throws IOException {
38 compile(out, Arrays.asList(names));
40 static void compile(Appendable out, List<String> names) throws IOException {
41 for (String baseClass : names) {
42 Map<String,String> processed = new HashMap<String, String>();
43 LinkedList<String> toProcess = new LinkedList<String>();
44 toProcess.add(baseClass);
47 Iterator<String> it = toProcess.iterator();
48 while (it.hasNext() && name == null) {
50 if (processed.get(n) != null) {
58 if (name.startsWith("java/")
59 && !name.equals("java/lang/Object")
60 && !name.equals("java/lang/Class")
61 && !name.equals("java/lang/Math")
62 && !name.equals("java/lang/Number")
63 && !name.equals("java/lang/Integer")
64 && !name.equals("java/lang/Float")
65 && !name.equals("java/lang/Double")
66 && !name.equals("java/lang/Throwable")
67 && !name.equals("java/lang/Exception")
68 && !name.equals("java/lang/RuntimeException")
69 && !name.equals("java/lang/UnsupportedOperationException")
70 && !name.equals("java/lang/String")
71 && !name.equals("java/lang/String$CaseInsensitiveComparator")
72 && !name.equals("java/lang/StringBuilder")
73 && !name.equals("java/lang/AbstractStringBuilder")
75 processed.put(name, "");
78 InputStream is = loadClass(name);
80 throw new IOException("Can't find class " + name);
82 LinkedList<String> scripts = new LinkedList<String>();
84 String initCode = ByteCodeToJavaScript.compile(is, out, toProcess, scripts);
85 processed.put(name, initCode == null ? "" : initCode);
86 } catch (RuntimeException ex) {
87 if (out instanceof CharSequence) {
88 CharSequence seq = (CharSequence)out;
89 int lastBlock = seq.length();
90 while (lastBlock-- >= 0) {
91 if (seq.charAt(lastBlock) == '{') {
95 throw new IOException("Error while compiling " + name + "\n"
96 + seq.subSequence(lastBlock + 1, seq.length()), ex
99 throw new IOException("Error while compiling " + name + "\n"
104 for (String resource : scripts) {
105 InputStream emul = GenJS.class.getResourceAsStream(resource);
107 throw new IOException("Can't find " + resource);
109 readResource(emul, out);
113 Collections.reverse(toProcess);
115 for (String clazz : toProcess) {
116 String initCode = processed.remove(clazz);
117 if (initCode != null) {
118 out.append(initCode).append("\n");
123 private static void readResource(InputStream emul, Appendable out) throws IOException {
127 int ch = emul.read();
131 if (ch < 0 || ch > 255) {
132 throw new IOException("Invalid char in emulation " + ch);
139 out.append((char)ch);
146 out.append('/').append((char)ch);
169 private static InputStream loadClass(String name) throws IOException {
170 Enumeration<URL> en = ClassLoader.getSystemClassLoader().getResources(name + ".class");
172 while (en.hasMoreElements()) {
173 u = en.nextElement();
176 throw new IOException("Can't find " + name);
178 return u.openStream();