jaroslav@106
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/**
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jaroslav@106
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* Back 2 Browser Bytecode Translator
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jaroslav@106
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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jaroslav@106
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*
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jaroslav@106
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* This program is free software: you can redistribute it and/or modify
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jaroslav@106
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* it under the terms of the GNU General Public License as published by
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jaroslav@106
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* the Free Software Foundation, version 2 of the License.
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jaroslav@106
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*
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jaroslav@106
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* This program is distributed in the hope that it will be useful,
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jaroslav@106
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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jaroslav@106
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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jaroslav@106
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* GNU General Public License for more details.
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jaroslav@106
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*
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jaroslav@106
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* You should have received a copy of the GNU General Public License
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jaroslav@106
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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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jaroslav@106
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*/
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package org.apidesign.vm4brwsr;
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jaroslav@29
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jaroslav@29
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import java.io.IOException;
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jaroslav@29
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import java.io.InputStream;
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jaroslav@93
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import java.net.URL;
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jaroslav@93
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import java.util.Enumeration;
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jaroslav@29
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jaroslav@29
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/** Generator of JavaScript from bytecode of classes on classpath of the VM.
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jaroslav@29
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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jtulach@162
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final class GenJS extends ByteCodeToJavaScript {
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public GenJS(Appendable out) {
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jtulach@162
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super(out);
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}
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jaroslav@29
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jaroslav@29
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static void compile(Appendable out, String... names) throws IOException {
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jtulach@162
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compile(out, StringArray.asList(names));
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jaroslav@29
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}
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jtulach@168
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static void compile(ClassLoader l, Appendable out, String... names) throws IOException {
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jtulach@168
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compile(l, out, StringArray.asList(names));
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jtulach@168
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}
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jtulach@162
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static void compile(Appendable out, StringArray names) throws IOException {
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jaroslav@109
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compile(GenJS.class.getClassLoader(), out, names);
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jaroslav@109
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}
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jtulach@162
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static void compile(ClassLoader l, Appendable out, StringArray names) throws IOException {
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jaroslav@172
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out.append("Array.prototype.fillNulls = function() {\n" +
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jaroslav@172
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" for(var i = 0; i < this.length; i++) {\n" +
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jaroslav@172
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" this[i] = null;\n" +
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" }\n" +
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" return this;\n" +
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"};");
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jaroslav@172
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jaroslav@172
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jtulach@162
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StringArray processed = new StringArray();
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jtulach@162
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StringArray initCode = new StringArray();
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jtulach@162
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for (String baseClass : names.toArray()) {
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jtulach@162
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GenJS js = new GenJS(out);
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jtulach@162
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js.references.add(baseClass);
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jaroslav@97
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for (;;) {
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jaroslav@97
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String name = null;
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jtulach@162
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for (String n : js.references.toArray()) {
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jtulach@162
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if (processed.contains(n)) {
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jaroslav@97
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continue;
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jaroslav@97
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}
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jaroslav@97
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name = n;
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jaroslav@97
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}
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jaroslav@97
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if (name == null) {
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jaroslav@97
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break;
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jaroslav@97
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}
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jaroslav@109
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InputStream is = loadClass(l, name);
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jaroslav@97
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if (is == null) {
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jaroslav@97
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throw new IOException("Can't find class " + name);
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jaroslav@97
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}
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jaroslav@97
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try {
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jtulach@162
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String ic = js.compile(is);
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jtulach@162
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processed.add(name);
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initCode.add(ic == null ? "" : ic);
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jaroslav@97
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} catch (RuntimeException ex) {
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jaroslav@97
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if (out instanceof CharSequence) {
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jaroslav@97
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CharSequence seq = (CharSequence)out;
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jaroslav@97
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int lastBlock = seq.length();
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jaroslav@151
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while (lastBlock-- > 0) {
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jaroslav@97
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if (seq.charAt(lastBlock) == '{') {
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jaroslav@97
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break;
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jaroslav@97
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}
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jaroslav@29
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}
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jaroslav@97
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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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jaroslav@29
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}
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}
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jaroslav@29
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}
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jaroslav@97
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jaroslav@250
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for (String resource : js.scripts.toArray()) {
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jaroslav@250
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while (resource.startsWith("/")) {
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jaroslav@250
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resource = resource.substring(1);
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jaroslav@250
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}
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InputStream emul = l.getResourceAsStream(resource);
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jaroslav@250
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if (emul == null) {
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jaroslav@250
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throw new IOException("Can't find " + resource);
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jaroslav@250
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}
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readResource(emul, out);
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}
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js.scripts = new StringArray();
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jtulach@162
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StringArray toInit = StringArray.asList(js.references.toArray());
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jtulach@162
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toInit.reverse();
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jtulach@129
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jtulach@162
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for (String ic : toInit.toArray()) {
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jtulach@162
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int indx = processed.indexOf(ic);
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jtulach@162
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if (indx >= 0) {
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jtulach@162
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out.append(initCode.toArray()[indx]).append("\n");
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initCode.toArray()[indx] = "";
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jaroslav@91
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}
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jaroslav@91
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}
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jaroslav@133
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jaroslav@29
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}
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}
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jaroslav@90
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private static void readResource(InputStream emul, Appendable out) throws IOException {
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jaroslav@90
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try {
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jaroslav@90
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int state = 0;
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jaroslav@90
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for (;;) {
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jaroslav@90
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int ch = emul.read();
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jaroslav@90
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if (ch == -1) {
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jaroslav@90
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break;
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jaroslav@90
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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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jaroslav@90
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}
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jaroslav@90
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switch (state) {
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case 0:
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jaroslav@90
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if (ch == '/') {
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state = 1;
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jaroslav@90
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} else {
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jaroslav@90
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out.append((char)ch);
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jaroslav@90
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}
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jaroslav@90
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break;
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case 1:
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if (ch == '*') {
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jaroslav@90
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state = 2;
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jaroslav@90
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} else {
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jaroslav@90
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out.append('/').append((char)ch);
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jaroslav@90
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state = 0;
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jaroslav@90
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}
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jaroslav@90
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break;
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jaroslav@90
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case 2:
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jaroslav@90
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if (ch == '*') {
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jaroslav@90
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state = 3;
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jaroslav@90
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}
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jaroslav@90
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break;
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jaroslav@90
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case 3:
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jaroslav@90
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if (ch == '/') {
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jaroslav@90
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state = 0;
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jaroslav@90
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} else {
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jaroslav@90
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state = 2;
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jaroslav@90
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}
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jaroslav@90
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break;
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jaroslav@90
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}
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jaroslav@90
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}
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jaroslav@90
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} finally {
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jaroslav@90
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emul.close();
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jaroslav@90
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}
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jaroslav@90
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}
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jaroslav@93
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jaroslav@109
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private static InputStream loadClass(ClassLoader l, String name) throws IOException {
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jaroslav@109
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Enumeration<URL> en = l.getResources(name + ".class");
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jaroslav@93
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URL u = null;
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jaroslav@93
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while (en.hasMoreElements()) {
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jaroslav@93
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u = en.nextElement();
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jaroslav@93
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}
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jaroslav@93
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if (u == null) {
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jaroslav@93
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throw new IOException("Can't find " + name);
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jaroslav@93
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}
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jtulach@162
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if (u.toExternalForm().contains("rt.jar!")) {
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jtulach@162
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throw new IOException("No emulation for " + u);
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jtulach@162
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}
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jaroslav@93
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return u.openStream();
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jaroslav@93
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}
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jaroslav@136
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jaroslav@136
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static String toString(String name) throws IOException {
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jaroslav@136
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StringBuilder sb = new StringBuilder();
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jaroslav@136
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compile(sb, name);
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jaroslav@136
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return sb.toString().toString();
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jaroslav@136
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}
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jtulach@162
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jtulach@162
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private StringArray scripts = new StringArray();
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jtulach@162
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private StringArray references = new StringArray();
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jtulach@162
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jtulach@162
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@Override
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jtulach@162
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protected boolean requireReference(String cn) {
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jtulach@162
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if (references.contains(cn)) {
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jtulach@162
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return false;
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jtulach@162
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}
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jtulach@162
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references.add(cn);
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jtulach@162
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return true;
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jtulach@162
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}
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jtulach@162
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jtulach@162
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@Override
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jtulach@162
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protected void requireScript(String resourcePath) {
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jtulach@162
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scripts.add(resourcePath);
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jtulach@162
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}
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jaroslav@29
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}
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