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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.net.URL;
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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/** Conversion from classpath to load function.
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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final class ClassPath {
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private ClassPath() {
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}
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public static void init() {
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}
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@JavaScriptBody(args = { "arr" }, body = "return arr.length;")
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private static native int length(Object arr);
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@JavaScriptBody(args = { "arr", "index" }, body = "return arr[index];")
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private static native Object at(Object arr, int index);
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@JavaScriptBody(args = { "arr", "index", "value" }, body = "arr[index] = value; return value;")
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private static native Object set(Object arr, int index, Object value);
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public static byte[] loadFromCp(Object classpath, String res, int skip)
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throws IOException, ClassNotFoundException {
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for (int i = 0; i < length(classpath); i++) {
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Object c = at(classpath, i);
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if (c instanceof String) {
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try {
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String url = (String)c;
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final ZipHandler z = ZipHandler.toZip(url);
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c = set(classpath, i, z);
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final byte[] man = z.findRes("META-INF/MANIFEST.MF");
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if (man != null) {
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String mainClass = processClassPathAttr(man, url, classpath);
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// if (mainClass != null) {
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// Class.forName(mainClass);
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// }
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}
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} catch (IOException ex) {
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set(classpath, i, ex);
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log("Cannot load " + c + " - " + ex.getClass().getName() + ":" + ex.getMessage());
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}
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}
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if (res != null) {
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byte[] checkRes;
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if (c instanceof ZipHandler) {
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checkRes = ((ZipHandler)c).findRes(res);
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if (checkRes != null && --skip < 0) {
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return checkRes;
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}
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} else {
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checkRes = callFunction(c, res, skip);
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if (checkRes != null) {
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return checkRes;
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}
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}
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}
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}
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return null;
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}
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@JavaScriptBody(args = { "fn", "res", "skip" }, body =
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"if (typeof fn === 'function') return fn(res, skip);\n"
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+ "return null;"
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)
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private static native byte[] callFunction(Object fn, String res, int skip);
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@JavaScriptBody(args = { "msg" }, body = "if (typeof console !== 'undefined') console.log(msg.toString());")
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private static native void log(String msg);
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private static String processClassPathAttr(final byte[] man, String url, Object classpath) throws IOException {
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try (ParseMan is = new ParseMan(new ByteArrayInputStream(man))) {
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String cp = is.toString();
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if (cp != null) {
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cp = cp.trim();
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for (int p = 0; p < cp.length();) {
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int n = cp.indexOf(' ', p);
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if (n == -1) {
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n = cp.length();
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}
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String el = cp.substring(p, n);
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URL u = new URL(new URL(url), el);
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classpath = addToArray(classpath, u.toString());
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p = n + 1;
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}
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}
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return is.getMainClass();
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}
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}
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private static Object addToArray(Object arr, String value) {
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final int last = length(arr);
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Object ret = enlargeArray(arr, last + 1);
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set(ret, last, value);
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return ret;
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}
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@JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(null); return arr;")
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private static native Object enlargeArray(Object arr, int len);
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}
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