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package org.apidesign.vm4brwsr;
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import java.io.BufferedWriter;
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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.io.Writer;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Set;
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/** Generator of JavaScript from bytecode of classes on classpath of the VM.
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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final class GenJS {
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private GenJS() {}
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public static void main(String... args) throws IOException {
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if (args.length < 2) {
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System.err.println("Usage: java -cp ... -jar ... <file_to_generate_js_code_to> java/lang/Class org/your/App ...");
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return;
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}
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Writer w = new BufferedWriter(new FileWriter(args[0]));
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List<String> classes = Arrays.asList(args).subList(1, args.length);
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compile(w, classes);
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w.close();
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}
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static void compile(Appendable out, String... names) throws IOException {
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compile(out, Arrays.asList(names));
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}
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static void compile(Appendable out, List<String> names) throws IOException {
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Set<String> processed = new HashSet<String>();
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LinkedList<String> toProcess = new LinkedList<String>(names);
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for (;;) {
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toProcess.removeAll(processed);
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if (toProcess.isEmpty()) {
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break;
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}
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String name = toProcess.getFirst();
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processed.add(name);
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if (name.startsWith("sun/")) {
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continue;
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}
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if (name.startsWith("java/")
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&& !name.equals("java/lang/Object")
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&& !name.equals("java/lang/StringBuilder")
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&& !name.equals("java/lang/AbstractStringBuilder")
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) {
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continue;
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}
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InputStream is = GenJS.class.getClassLoader().getResourceAsStream(name + ".class");
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if (is == null) {
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throw new IOException("Can't find class " + name);
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}
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LinkedList<String> scripts = new LinkedList<String>();
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try {
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ByteCodeToJavaScript.compile(is, out, toProcess, scripts);
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} catch (RuntimeException ex) {
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if (out instanceof CharSequence) {
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CharSequence seq = (CharSequence)out;
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int lastBlock = seq.length();
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while (lastBlock-- >= 0) {
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if (seq.charAt(lastBlock) == '{') {
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break;
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}
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}
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throw new IOException("Error while compiling " + name + "\n"
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+ seq.subSequence(lastBlock + 1, seq.length()), ex
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);
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} else {
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throw new IOException("Error while compiling " + name + "\n"
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+ out, ex
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);
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}
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}
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for (String resource : scripts) {
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InputStream emul = GenJS.class.getResourceAsStream(resource);
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if (emul == null) {
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throw new IOException("Can't find " + resource);
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}
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readResource(emul, out);
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}
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}
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}
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private static void readResource(InputStream emul, Appendable out) throws IOException {
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try {
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int state = 0;
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for (;;) {
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int ch = emul.read();
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if (ch == -1) {
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break;
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}
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if (ch < 0 || ch > 255) {
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throw new IOException("Invalid char in emulation " + ch);
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}
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switch (state) {
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case 0:
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if (ch == '/') {
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state = 1;
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} else {
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out.append((char)ch);
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}
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break;
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case 1:
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if (ch == '*') {
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state = 2;
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} else {
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out.append('/').append((char)ch);
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state = 0;
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}
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break;
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case 2:
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if (ch == '*') {
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state = 3;
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}
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break;
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case 3:
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if (ch == '/') {
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state = 0;
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} else {
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state = 2;
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}
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break;
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}
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}
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} finally {
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emul.close();
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}
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}
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}
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