2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.vm4brwsr;
20 import java.io.ByteArrayInputStream;
21 import java.io.IOException;
22 import java.io.InputStream;
23 import org.apidesign.bck2brwsr.core.JavaScriptBody;
27 * @author Jaroslav Tulach <jtulach@netbeans.org>
30 private final Object loader;
31 private final Object[] args;
33 private VMLazy(Object loader, Object[] args) {
41 @JavaScriptBody(args={"l", "res", "args" }, body = ""
43 + "\n return args[0](res.toString());"
45 + "\n throw Object.getOwnPropertyNames(l.vm).toString() + x.toString();"
47 private static native byte[] read(Object l, String res, Object[] args);
49 static Object load(Object loader, String name, Object[] arguments)
50 throws IOException, ClassNotFoundException {
51 return new VMLazy(loader, arguments).load(name, false);
54 private Object load(String name, boolean instance)
55 throws IOException, ClassNotFoundException {
56 String res = name.replace('.', '/') + ".class";
57 byte[] arr = read(loader, res, args);
59 throw new ClassNotFoundException(name);
61 // beingDefined(loader, name);
62 StringBuilder out = new StringBuilder();
63 out.append("var loader = arguments[0];\n");
64 out.append("var vm = loader.vm;\n");
65 int prelude = out.length();
66 String initCode = new Gen(this, out).compile(new ByteArrayInputStream(arr));
67 String code = out.toString().toString();
68 // dump("Loading " + name);
70 String under = name.replace('.', '_');
71 Object fn = applyCode(loader, under, code, instance);
73 if (!initCode.isEmpty()) {
74 out.setLength(prelude);
76 code = out.toString().toString();
78 applyCode(loader, null, code, false);
84 // @JavaScriptBody(args = "s", body = "java.lang.System.out.println(s.toString());")
85 static void dump(String s) {
88 /* possibly not needed:
89 @JavaScriptBody(args = {"loader", "n" }, body =
90 "var cls = n.replace__Ljava_lang_String_2CC(n, '.','_').toString();" +
91 "loader.vm[cls] = true;\n"
93 private static native void beingDefined(Object loader, String name);
97 @JavaScriptBody(args = {"loader", "name", "script", "instance" }, body =
99 " new Function(script)(loader, name);\n" +
101 " throw 'Cannot compile ' + name + ' ' + ex + ' line: ' + ex.lineNumber + ' script:\\n' + script;\n" +
103 "return name != null ? vm[name](instance) : null;\n"
105 private static native Object applyCode(Object loader, String name, String script, boolean instance);
108 private static final class Gen extends ByteCodeToJavaScript {
109 private final VMLazy lazy;
111 public Gen(VMLazy vm, Appendable out) {
116 @JavaScriptBody(args = {"n"},
118 "var cls = n.replace__Ljava_lang_String_2CC('/','_').toString();"
119 + "\nvar dot = n.replace__Ljava_lang_String_2CC('/','.').toString();"
120 + "\nvar lazy = this._lazy();"
121 + "\nvar loader = lazy._loader();"
122 + "\nvar vm = loader.vm;"
123 + "\nif (vm[cls]) return false;"
124 + "\nvm[cls] = function() {"
125 + "\n var instance = arguments.length == 0 || arguments[0] === true;"
126 + "\n return lazy.load__Ljava_lang_Object_2Ljava_lang_String_2Z(dot, instance);"
130 protected boolean requireReference(String internalClassName) {
131 throw new UnsupportedOperationException();
135 protected void requireScript(String resourcePath) throws IOException {
136 InputStream is = getClass().getResourceAsStream(resourcePath);
137 StringBuilder sb = new StringBuilder();
145 applyCode(lazy.loader, null, sb.toString(), false);
149 String assignClass(String className) {
150 return "vm[arguments[1]]=";
154 String accessClass(String classOperation) {
155 return "vm." + classOperation;