jaroslav@29: package org.apidesign.vm4brwsr;
jaroslav@29: 
jaroslav@29: import java.io.BufferedWriter;
jaroslav@29: import java.io.FileWriter;
jaroslav@29: import java.io.IOException;
jaroslav@29: import java.io.InputStream;
jaroslav@29: import java.io.Writer;
jaroslav@29: import java.util.Arrays;
jaroslav@29: import java.util.HashSet;
jaroslav@29: import java.util.LinkedList;
jaroslav@29: import java.util.List;
jaroslav@29: import java.util.Set;
jaroslav@29: 
jaroslav@29: /** Generator of JavaScript from bytecode of classes on classpath of the VM.
jaroslav@29:  *
jaroslav@29:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@29:  */
jaroslav@29: final class GenJS {
jaroslav@29:     private GenJS() {}
jaroslav@29:     
jaroslav@29:     public static void main(String... args) throws IOException {
jaroslav@29:         if (args.length < 2) {
jaroslav@29:             System.err.println("Usage: java -cp ... -jar ... <file_to_generate_js_code_to> java/lang/Class org/your/App ...");
jaroslav@29:             return;
jaroslav@29:         }
jaroslav@29:         
jaroslav@29:         Writer w = new BufferedWriter(new FileWriter(args[0]));
jaroslav@29:         List<String> classes = Arrays.asList(args).subList(1, args.length);
jaroslav@29:         compile(w, classes);
jaroslav@29:         w.close();
jaroslav@29:     }
jaroslav@29:     
jaroslav@29:     static void compile(Appendable out, String... names) throws IOException {
jaroslav@29:         compile(out, Arrays.asList(names));
jaroslav@29:     }
jaroslav@29:     static void compile(Appendable out, List<String> names) throws IOException {
jaroslav@29:         Set<String> processed = new HashSet<String>();
jaroslav@29:         LinkedList<String> toProcess = new LinkedList<String>(names);
jaroslav@29:         for (;;) {
jaroslav@29:             toProcess.removeAll(processed);
jaroslav@29:             if (toProcess.isEmpty()) {
jaroslav@29:                 break;
jaroslav@29:             }
jaroslav@29:             String name = toProcess.getFirst();
jaroslav@29:             processed.add(name);
jaroslav@36:             if (name.startsWith("sun/")) {
jaroslav@36:                 continue;
jaroslav@36:             }
jaroslav@34:             if (name.startsWith("java/") 
jaroslav@34:                 && !name.equals("java/lang/Object")
jaroslav@34:                 && !name.equals("java/lang/String")
jaroslav@36:                 && !name.equals("java/lang/StringBuilder")
jaroslav@36:                 && !name.equals("java/lang/AbstractStringBuilder")
jaroslav@34:             ) {
jaroslav@29:                 continue;
jaroslav@29:             }
jaroslav@35:             InputStream emul = GenJS.class.getResourceAsStream("emulation/" + name.replace('/', '_') + ".js");
jaroslav@35:             if (emul != null) {
jaroslav@90:                 readResource(emul, out);
jaroslav@35:                 continue;
jaroslav@35:             }
jaroslav@35:             
jaroslav@29:             InputStream is = GenJS.class.getClassLoader().getResourceAsStream(name + ".class");
jaroslav@29:             if (is == null) {
jaroslav@29:                 throw new IOException("Can't find class " + name); 
jaroslav@29:             }
jaroslav@29:             try {
jaroslav@29:                 ByteCodeToJavaScript.compile(is, out, toProcess);
jaroslav@29:             } catch (RuntimeException ex) {
jaroslav@29:                 if (out instanceof CharSequence) {
jaroslav@29:                     CharSequence seq = (CharSequence)out;
jaroslav@29:                     int lastBlock = seq.length();
jaroslav@29:                     while (lastBlock-- >= 0) {
jaroslav@29:                         if (seq.charAt(lastBlock) == '{') {
jaroslav@29:                             break;
jaroslav@29:                         }
jaroslav@29:                     }
jaroslav@29:                     throw new IOException("Error while compiling " + name + "\n" 
jaroslav@29:                         + seq.subSequence(lastBlock + 1, seq.length()), ex
jaroslav@29:                     );
jaroslav@29:                 } else {
jaroslav@29:                     throw new IOException("Error while compiling " + name + "\n" 
jaroslav@29:                         + out, ex
jaroslav@29:                     );
jaroslav@29:                 }
jaroslav@29:             }
jaroslav@29:         }
jaroslav@29:     }
jaroslav@90:     private static void readResource(InputStream emul, Appendable out) throws IOException {
jaroslav@90:         try {
jaroslav@90:             int state = 0;
jaroslav@90:             for (;;) {
jaroslav@90:                 int ch = emul.read();
jaroslav@90:                 if (ch == -1) {
jaroslav@90:                     break;
jaroslav@90:                 }
jaroslav@90:                 if (ch < 0 || ch > 255) {
jaroslav@90:                     throw new IOException("Invalid char in emulation " + ch);
jaroslav@90:                 }
jaroslav@90:                 switch (state) {
jaroslav@90:                     case 0: 
jaroslav@90:                         if (ch == '/') {
jaroslav@90:                             state = 1;
jaroslav@90:                         } else {
jaroslav@90:                             out.append((char)ch);
jaroslav@90:                         }
jaroslav@90:                         break;
jaroslav@90:                     case 1:
jaroslav@90:                         if (ch == '*') {
jaroslav@90:                             state = 2;
jaroslav@90:                         } else {
jaroslav@90:                             out.append('/').append((char)ch);
jaroslav@90:                             state = 0;
jaroslav@90:                         }
jaroslav@90:                         break;
jaroslav@90:                     case 2:
jaroslav@90:                         if (ch == '*') {
jaroslav@90:                             state = 3;
jaroslav@90:                         }
jaroslav@90:                         break;
jaroslav@90:                     case 3:
jaroslav@90:                         if (ch == '/') {
jaroslav@90:                             state = 0;
jaroslav@90:                         } else {
jaroslav@90:                             state = 2;
jaroslav@90:                         }
jaroslav@90:                         break;
jaroslav@90:                 }
jaroslav@90:             }
jaroslav@90:         } finally {
jaroslav@90:             emul.close();
jaroslav@90:         }
jaroslav@90:     }
jaroslav@29:     
jaroslav@29: }