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/Number")
62 && !name.equals("java/lang/Integer")
63 && !name.equals("java/lang/Throwable")
64 && !name.equals("java/lang/Exception")
65 && !name.equals("java/lang/RuntimeException")
66 && !name.equals("java/lang/UnsupportedOperationException")
67 && !name.equals("java/lang/String")
68 && !name.equals("java/lang/String$CaseInsensitiveComparator")
69 && !name.equals("java/lang/StringBuilder")
70 && !name.equals("java/lang/AbstractStringBuilder")
72 processed.put(name, "");
75 InputStream is = loadClass(name);
77 throw new IOException("Can't find class " + name);
79 LinkedList<String> scripts = new LinkedList<String>();
81 String initCode = ByteCodeToJavaScript.compile(is, out, toProcess, scripts);
82 processed.put(name, initCode == null ? "" : initCode);
83 } catch (RuntimeException ex) {
84 if (out instanceof CharSequence) {
85 CharSequence seq = (CharSequence)out;
86 int lastBlock = seq.length();
87 while (lastBlock-- >= 0) {
88 if (seq.charAt(lastBlock) == '{') {
92 throw new IOException("Error while compiling " + name + "\n"
93 + seq.subSequence(lastBlock + 1, seq.length()), ex
96 throw new IOException("Error while compiling " + name + "\n"
101 for (String resource : scripts) {
102 InputStream emul = GenJS.class.getResourceAsStream(resource);
104 throw new IOException("Can't find " + resource);
106 readResource(emul, out);
110 Collections.reverse(toProcess);
112 for (String clazz : toProcess) {
113 String initCode = processed.remove(clazz);
114 if (initCode != null) {
115 out.append(initCode).append("\n");
121 private static void readResource(InputStream emul, Appendable out) throws IOException {
125 int ch = emul.read();
129 if (ch < 0 || ch > 255) {
130 throw new IOException("Invalid char in emulation " + ch);
137 out.append((char)ch);
144 out.append('/').append((char)ch);
167 private static InputStream loadClass(String name) throws IOException {
168 Enumeration<URL> en = ClassLoader.getSystemClassLoader().getResources(name + ".class");
170 while (en.hasMoreElements()) {
171 u = en.nextElement();
174 throw new IOException("Can't find " + name);
176 return u.openStream();