1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ClassPath.java	Wed May 07 17:24:29 2014 +0200
     1.3 @@ -0,0 +1,119 @@
     1.4 +/**
     1.5 + * Back 2 Browser Bytecode Translator
     1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
     1.7 + *
     1.8 + * This program is free software: you can redistribute it and/or modify
     1.9 + * it under the terms of the GNU General Public License as published by
    1.10 + * the Free Software Foundation, version 2 of the License.
    1.11 + *
    1.12 + * This program is distributed in the hope that it will be useful,
    1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.15 + * GNU General Public License for more details.
    1.16 + *
    1.17 + * You should have received a copy of the GNU General Public License
    1.18 + * along with this program. Look for COPYING file in the top folder.
    1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
    1.20 + */
    1.21 +package org.apidesign.vm4brwsr;
    1.22 +
    1.23 +import java.io.ByteArrayInputStream;
    1.24 +import java.io.IOException;
    1.25 +import java.net.URL;
    1.26 +import org.apidesign.bck2brwsr.core.JavaScriptBody;
    1.27 +
    1.28 +/** Conversion from classpath to load function.
    1.29 + *
    1.30 + * @author Jaroslav Tulach <jtulach@netbeans.org>
    1.31 + */
    1.32 +final class ClassPath {
    1.33 +    private ClassPath() {
    1.34 +    }
    1.35 +    
    1.36 +    public static void init() {
    1.37 +    }
    1.38 +    @JavaScriptBody(args = { "arr" }, body = "return arr.length;")
    1.39 +    private static native int length(Object arr);
    1.40 +    @JavaScriptBody(args = { "arr", "index" }, body = "return arr[index];")
    1.41 +    private static native Object at(Object arr, int index);
    1.42 +    @JavaScriptBody(args = { "arr", "index", "value" }, body = "arr[index] = value; return value;")
    1.43 +    private static native Object set(Object arr, int index, Object value);
    1.44 +    
    1.45 +    public static byte[] loadFromCp(Object classpath, String res, int skip) 
    1.46 +    throws IOException, ClassNotFoundException {
    1.47 +        for (int i = 0; i < length(classpath); i++) {
    1.48 +            Object c = at(classpath, i);
    1.49 +            if (c instanceof String) {
    1.50 +                try {
    1.51 +                    String url = (String)c;
    1.52 +                    final ZipHandler z = ZipHandler.toZip(url);
    1.53 +                    c = set(classpath, i, z);
    1.54 +                    final byte[] man = z.findRes("META-INF/MANIFEST.MF");
    1.55 +                    if (man != null) {
    1.56 +                        String mainClass = processClassPathAttr(man, url, classpath);
    1.57 +//                        if (mainClass != null) {
    1.58 +//                            Class.forName(mainClass);
    1.59 +//                        }
    1.60 +                    }
    1.61 +                } catch (IOException ex) {
    1.62 +                    set(classpath, i, ex);
    1.63 +                    log("Cannot load " + c + " - " + ex.getClass().getName() + ":" + ex.getMessage());
    1.64 +                }
    1.65 +            }
    1.66 +            if (res != null) {
    1.67 +                byte[] checkRes;
    1.68 +                if (c instanceof ZipHandler) {
    1.69 +                    checkRes = ((ZipHandler)c).findRes(res);
    1.70 +                    if (checkRes != null && --skip < 0) {
    1.71 +                        return checkRes;
    1.72 +                    }
    1.73 +                } else {
    1.74 +                    checkRes = callFunction(c, res, skip);
    1.75 +                    if (checkRes != null) {
    1.76 +                        return checkRes;
    1.77 +                    }
    1.78 +                }
    1.79 +            }
    1.80 +        }
    1.81 +        return null;
    1.82 +    }
    1.83 +    
    1.84 +    @JavaScriptBody(args = { "fn", "res", "skip" }, body = 
    1.85 +        "if (typeof fn === 'function') return fn(res, skip);\n"
    1.86 +      + "return null;"
    1.87 +    )
    1.88 +    private static native byte[] callFunction(Object fn, String res, int skip);
    1.89 +    
    1.90 +    @JavaScriptBody(args = { "msg" }, body = "if (typeof console !== 'undefined') console.log(msg.toString());")
    1.91 +    private static native void log(String msg);
    1.92 +
    1.93 +    private static String processClassPathAttr(final byte[] man, String url, Object classpath) throws IOException {
    1.94 +        try (ParseMan is = new ParseMan(new ByteArrayInputStream(man))) {
    1.95 +            String cp = is.toString();
    1.96 +            if (cp != null) {
    1.97 +                cp = cp.trim();
    1.98 +                for (int p = 0; p < cp.length();) {
    1.99 +                    int n = cp.indexOf(' ', p);
   1.100 +                    if (n == -1) {
   1.101 +                        n = cp.length();
   1.102 +                    }
   1.103 +                    String el = cp.substring(p, n);
   1.104 +                    URL u = new URL(new URL(url), el);
   1.105 +                    classpath = addToArray(classpath, u.toString());
   1.106 +                    p = n + 1;
   1.107 +                }
   1.108 +            }
   1.109 +            return is.getMainClass();
   1.110 +        }
   1.111 +    }
   1.112 +
   1.113 +    private static Object addToArray(Object arr, String value) {
   1.114 +        final int last = length(arr);
   1.115 +        Object ret = enlargeArray(arr, last + 1);
   1.116 +        set(ret, last, value);
   1.117 +        return ret;
   1.118 +    }
   1.119 +
   1.120 +    @JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(null); return arr;")
   1.121 +    private static native Object enlargeArray(Object arr, int len);
   1.122 +}