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org.apidesign.vm4brwsr.VM Maven / Gradle / Ivy
/**
* Back 2 Browser Bytecode Translator
* Copyright (C) 2012-2017 Jaroslav Tulach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. Look for COPYING file in the top folder.
* If not, see http://opensource.org/licenses/GPL-2.0.
*/
package org.apidesign.vm4brwsr;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import org.apidesign.bck2brwsr.core.JavaScriptBody;
import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
/** Generator of JavaScript from bytecode of classes on classpath of the VM.
*
* @author Jaroslav Tulach
*/
abstract class VM extends ByteCodeToJavaScript {
protected final ClassDataCache classDataCache;
private final Bck2Brwsr.Resources resources;
private final ExportedSymbols exportedSymbols;
private final StringBuilder invokerMethods;
private final StringArray asBinary;
int exportedCount;
private VM(
Appendable out, Bck2Brwsr.Resources resources,
StringArray explicitlyExported, StringArray asBinary
) {
super(out);
this.resources = resources;
this.classDataCache = new ClassDataCache(resources);
this.exportedSymbols = new ExportedSymbols(resources, explicitlyExported);
this.invokerMethods = new StringBuilder();
this.asBinary = asBinary;
}
static {
// uses VMLazy to load dynamic classes
boolean assertsOn = false;
assert assertsOn = true;
if (assertsOn) {
VMLazy.init();
ClassPath.init();
}
}
@Override
boolean debug(Appendable out, String msg) throws IOException {
return false;
}
static void compile(Appendable out,
Bck2Brwsr config
) throws IOException {
String[] both = config.classes().toArray();
final StringArray fixedNames = new StringArray();
boolean addThree = false;
VM vm;
if (config.isExtension()) {
vm = new Extension(out,
config.getResources(), both, config.exported(),
config.allResources(), config.classpath()
);
addThree = true;
} else {
if (config.includeVM()) {
fixedNames.add(VM.class.getName().replace('.', '/'));
addThree = true;
}
vm = new Standalone(out,
config.getResources(), config.exported(),
config.allResources()
);
}
if (addThree) {
fixedNames.add(Object.class.getName().replace('.', '/'));
fixedNames.add(Class.class.getName().replace('.', '/'));
fixedNames.add(ArithmeticException.class.getName().replace('.', '/'));
}
vm.doCompile(out, fixedNames.addAndNew(both));
}
private void doCompile(Appendable out, StringArray names) throws IOException {
generatePrologue(out);
out.append("\n var invoker = {};");
out.append("\n function registerClass(vm, name, fn) {");
out.append("\n if (!vm[name]) vm[name] = fn;");
out.append("\n return vm[name];");
out.append("\n }");
generateBody(out, names);
out.append(invokerMethods);
for (String r : asBinary.toArray()) {
out.append("\n ").append(getExportsObject()).append("['registerResource']('");
out.append(r).append("', '");
InputStream is = this.resources.get(r);
int avail = is.available();
if (avail <= 0) {
avail = 4096;
}
byte[] arr = new byte[avail];
int offset = 0;
for (;;) {
if (offset == arr.length) {
byte[] tmp = new byte[arr.length * 2];
System.arraycopy(arr, 0, tmp, 0, arr.length);
arr = tmp;
}
int len = is.read(arr, offset, arr.length - offset);
if (len == -1) {
break;
}
offset += len;
}
if (offset != arr.length) {
byte[] tmp = new byte[offset];
System.arraycopy(arr, 0, tmp, 0, offset);
arr = tmp;
}
out.append(btoa(arr));
out.append("');");
}
out.append("\n");
generateEpilogue(out);
}
@JavaScriptBody(args = { "arr" }, body = "return btoa(arr);")
private static String btoa(byte[] arr) {
return javax.xml.bind.DatatypeConverter.printBase64Binary(arr);
}
protected abstract void generatePrologue(Appendable out) throws IOException;
protected abstract void generateEpilogue(Appendable out) throws IOException;
protected abstract String getExportsObject();
protected abstract boolean isExternalClass(String className);
protected abstract void lazyReference(Appendable out, String n) throws IOException;
@Override
protected final void declareClass(Appendable out, ClassData classData, String mangledName)
throws IOException {
if (exportedSymbols.isExported(classData)) {
out.append("registerClass(").append(getExportsObject()).append(",'")
.append(mangledName)
.append("',")
.append(mangledName)
.append(")");
exportedCount++;
} else {
out.append(mangledName);
}
}
protected String generateClass(Appendable out, String className) throws IOException {
ClassData classData = classDataCache.getClassData(className);
if (classData == null) {
throw new IOException("Can't find class " + className);
}
return compile(classData);
}
@Override
protected void declaredField(Appendable out, FieldData fieldData, String destObject, String mangledName) throws IOException {
if (exportedSymbols.isExported(fieldData)) {
exportMember(out, destObject, mangledName);
}
}
@Override
protected void declaredMethod(Appendable out, MethodData methodData, String destObject, String mangledName) throws IOException {
if (isHierarchyExported(methodData)) {
exportMember(out, destObject, mangledName);
}
}
private void exportMember(Appendable out, String destObject, String memberName)
throws IOException {
out.append("\n").append(destObject).append("['")
.append(memberName)
.append("'] = m;\n");
}
private void generateBody(Appendable out, StringArray names) throws IOException {
StringArray processed = new StringArray();
StringArray initCode = new StringArray();
StringArray skipClass = new StringArray();
for (String baseClass : names.toArray()) {
references.add(baseClass);
for (;;) {
String name = null;
for (String n : references.toArray()) {
if (skipClass.contains(n)) {
continue;
}
if (processed.contains(n)) {
continue;
}
name = n;
}
if (name == null) {
break;
}
InputStream is = resources.get(name + ".class");
if (is == null) {
lazyReference(out, name);
skipClass.add(name);
continue;
}
try {
String ic = generateClass(out, name);
processed.add(name);
initCode.add(ic == null ? "" : ic);
} catch (RuntimeException ex) {
throw new IOException("Error while compiling " + name + "\n", ex);
}
}
for (String resource : scripts.toArray()) {
while (resource.startsWith("/")) {
resource = resource.substring(1);
}
requireResourceImpl(out, false, resource);
asBinary.remove(resource);
}
scripts = new StringArray();
StringArray toInit = StringArray.asList(references.toArray());
toInit.reverse();
for (String ic : toInit.toArray()) {
int indx = processed.indexOf(ic);
if (indx >= 0) {
final String theCode = initCode.toArray()[indx];
if (!theCode.isEmpty()) {
out.append(theCode).append("\n");
}
initCode.toArray()[indx] = "";
}
}
}
}
final void requireResourceImpl(Appendable out, boolean useEval, String resource) throws IOException {
InputStream emul = resources.get(resource);
if (emul == null) {
throw new IOException("Can't find " + resource);
}
out.append("\n// resource from ").append(resource).append("\n");
out.append("\n");
if (useEval) {
out.append("(0 || eval)(\"");
}
try (Reader r = new InputStreamReader(emul, "UTF-8")) {
readResource(useEval, r, out);
}
if (useEval) {
out.append("\");");
}
out.append("\n");
}
private static void readResource(boolean escape, Reader emul, Appendable out) throws IOException {
for (;;) {
int ch = emul.read();
if (ch == -1) {
break;
}
if (escape) {
switch (ch) {
case '"':
out.append("\\\"");
break;
case '\\':
out.append("\\\\");
break;
case '\n':
out.append("\\n\"\n + \"");
break;
case '\t':
out.append("\\t");
break;
case '\r':
out.append("\\r");
break;
default:
out.append((char)ch);
}
} else {
out.append((char)ch);
}
}
}
static String toString(String name) throws IOException {
StringBuilder sb = new StringBuilder();
// compile(sb, name);
return sb.toString().toString();
}
private StringArray scripts = new StringArray();
private StringArray references = new StringArray();
@Override
protected boolean requireReference(String cn) {
return references.addIfMissing(cn);
}
@Override
protected void requireScript(String resourcePath) {
scripts.add(resourcePath);
}
@Override
String assignClass(String className) {
return "vm." + className + " = ";
}
@Override
String accessClass(String className) {
return "vm." + className;
}
@Override
protected FieldData findField(String[] fieldInfoName) throws IOException {
FieldData field = classDataCache.findField(
fieldInfoName[0], fieldInfoName[1], fieldInfoName[2]
);
return field != null && canAccessDirectly(field.cls) ? field : null;
}
@Override
protected String accessField(String object, FieldData field, String[] fieldInfoName)
throws IOException {
if (field != null && !field.isStatic()) {
return "['fld_" + object + "_" + field.getName() + "']";
} else {
String mangledName = "_" + fieldInfoName[1];
return accessNonVirtualMember(
object, mangledName, field != null ? field.cls : null
);
}
}
@Override
protected String accessStaticMethod(
String object,
String mangledName,
String[] fieldInfoName) throws IOException {
final MethodData method =
classDataCache.findMethod(fieldInfoName[0],
fieldInfoName[1],
fieldInfoName[2]);
return accessNonVirtualMember(object, mangledName,
(method != null) ? method.cls : null);
}
@Override
protected String accessVirtualMethod(
String object,
String mangledName,
String[] fieldInfoName,
int params
) throws IOException {
final ClassData referencedClass =
classDataCache.getClassData(fieldInfoName[0]);
final MethodData method =
classDataCache.findMethod(referencedClass,
fieldInfoName[1],
fieldInfoName[2]);
if ((method != null)
&& !isExternalClass(method.cls.getClassName())
&& (((method.access & ByteCodeParser.ACC_FINAL) != 0)
|| ((referencedClass.getAccessFlags()
& ByteCodeParser.ACC_FINAL) != 0)
|| !isHierarchyExported(method))) {
return object + "." + mangledName + '(';
}
return accessThroughInvoker(object, mangledName, params);
}
private String accessThroughInvoker(String object, String mangledName, int params)
throws IOException {
String def = "\n invoker." + mangledName + " = function(target";
if (invokerMethods.indexOf(def) == -1) {
invokerMethods.append(def);
for (int j = 1; j < params; j++) {
invokerMethods.append(", p").append(j);
}
invokerMethods.append(") {\n return target['").
append(mangledName).append("'](");
for (int j = 1; j < params; j++) {
if (j > 1) {
invokerMethods.append(",");
}
invokerMethods.append("p").append(j);
}
invokerMethods.append(");\n };");
}
return "invoker." + mangledName + '(' + object + (params > 1 ? "," : "");
}
private boolean isHierarchyExported(final MethodData methodData)
throws IOException {
if (exportedSymbols.isExported(methodData)) {
return true;
}
if ((methodData.access & (ByteCodeParser.ACC_PRIVATE
| ByteCodeParser.ACC_STATIC)) != 0) {
return false;
}
final ExportedMethodFinder exportedMethodFinder =
new ExportedMethodFinder(exportedSymbols);
classDataCache.findMethods(
methodData.cls,
methodData.getName(),
methodData.getInternalSig(),
exportedMethodFinder);
return (exportedMethodFinder.getFound() != null);
}
private boolean canAccessDirectly(ClassData declaringClass) {
if (declaringClass == null) {
return false;
}
final String className = declaringClass.getClassName();
if (
"java/lang/Object".equals(className) ||
"java/lang/reflect/Array".equals(className) ||
isExternalClass(className)
) {
return false;
}
return true;
}
private String accessNonVirtualMember(
String object, String mangledName, ClassData declaringClass
) {
return canAccessDirectly(declaringClass) ?
object + "." + mangledName :
object + "['" + mangledName + "']";
}
private final class ExportedMethodFinder
implements ClassDataCache.TraversalCallback {
private final ExportedSymbols exportedSymbols;
private MethodData found;
public ExportedMethodFinder(final ExportedSymbols exportedSymbols) {
this.exportedSymbols = exportedSymbols;
}
@Override
public boolean traverse(final MethodData methodData) {
try {
if (
exportedSymbols.isExported(methodData) ||
isExternalClass(methodData.cls.getClassName())
) {
found = methodData;
return false;
}
} catch (final IOException e) {
}
return true;
}
public MethodData getFound() {
return found;
}
}
private static final class Standalone extends VM {
private Standalone(Appendable out,
Bck2Brwsr.Resources resources,
StringArray explicitlyExported, StringArray asBinary
) {
super(out, resources, explicitlyExported, asBinary);
}
@Override
protected void generatePrologue(Appendable out) throws IOException {
out.append("(function VM(global) {var fillInVMSkeleton = function(vm) {");
}
@Override
protected void generateEpilogue(Appendable out) throws IOException {
out.append(
" return vm;\n"
+ " };\n"
+ " var extensions = [];\n"
+ " function replaceAll(s, target, replacement) {\n"
+ " var pos = 0;\n"
+ " for (;;) {\n"
+ " var indx = s.indexOf(target, pos);\n"
+ " if (indx === -1) {\n"
+ " return s;\n"
+ " }\n"
+ " pos = indx + replacement.length;\n"
+ " s = s.substring(0, indx) + replacement + s.substring(indx + target.length);\n"
+ " }\n"
+ " }\n"
+ " function mangleClass(name) {\n"
+ " name = replaceAll(name, '_', '_1');\n"
+ " name = replaceAll(name, '.', '_');\n"
+ " return name;\n"
+ " };\n"
+ " var pending = [];\n"
+ " var pendingClasses = [];\n"
+ " function wrapJavaMethod(wrapper, m, method) {\n"
+ " wrapper[m] = function() {\n"
+ " return method.apply(null, arguments);\n"
+ " };\n"
+ " var underscores = m.indexOf('__');\n"
+ " if (underscores >= 0) {\n"
+ " var shortName = m.substring(0, underscores);\n"
+ " if (!wrapper[shortName]) {\n"
+ " wrapper[shortName] = wrapper[m];\n"
+ " }\n"
+ " }\n"
+ " }\n"
+ " function wrapAllMethods(wrapper, realClass) {\n"
+ " for (var m in realClass) {\n"
+ " var method = realClass[m];\n"
+ " if (method && (method['access'] & 8) === 8) {\n"
+ " wrapJavaMethod(wrapper, m, method);\n"
+ " }\n"
+ " }\n"
+ " }\n"
+ " function wrapJava(vm, clazz, callback, realClass) {\n"
+ " var wrapper = {\n"
+ " };\n"
+ " if (realClass) {\n"
+ " wrapAllMethods(wrapper, realClass)\n"
+ " }\n"
+ " if (!wrapper['invoke']) {\n"
+ " wrapper['invoke'] = function() {\n"
+ " return invokeMethod(vm, clazz, arguments);\n"
+ " }\n"
+ " }\n"
+ " if (typeof callback === 'function') {\n"
+ " callback(wrapper);\n"
+ " }\n"
+ " return wrapper;\n"
+ " }\n"
+ " function extensionLoaded(ev) {\n"
+ " var at = pending.indexOf(ev.target);\n"
+ " pending.splice(at, 1);\n"
+ " if (pending.length === 0) {\n"
+ " for (var i = 0; i < pendingClasses.length; i += 4) {\n"
+ " var vm = pendingClasses[i];\n"
+ " var clazz = pendingClasses[i + 1];\n"
+ " var args = pendingClasses[i + 2];\n"
+ " var callback = pendingClasses[i + 3];\n"
+ " invokeMethod(vm, clazz, args);\n"
+ " wrapJava(vm, clazz, callback);\n"
+ " }\n"
+ " pendingClasses = [];\n"
+ " }\n"
+ " }\n"
+ " function invokeMethod(vm, n, args) {\n"
+ " var clazz = vm.loadClass(n);\n"
+ " if (args) {\n"
+ " var seek = args[0];\n"
+ " var prefix = seek.indexOf('__') == -1 ? seek + '__' : seek;\n"
+ " args = Array.prototype.slice.call(args, 1);\n"
+ " var found = '';\n"
+ " for (var m in clazz) {\n"
+ " if (m.indexOf(prefix) === 0) {\n"
+ " var method = clazz[m];\n"
+ " if ((method['access'] & 8) === 8) {\n"
+ " return method.apply(null, args);\n"
+ " }\n"
+ " }\n"
+ " found += m.toString() + '\\n'\n"
+ " }\n"
+ " throw 'Cannot find ' + seek + ' in ' + n + ' found:\\n' + found;\n"
+ " }\n"
+ " }\n"
+ " function extensionError(ev) {\n"
+ " console.log('error loading ' + ev.target.src);\n"
+ " extensionLoaded(ev);\n"
+ " }\n"
+ " function loadExtension(url, registerScript) {\n"
+ " if (url.substring(url.length - 4) == '.jar')\n"
+ " url = url.substring(0, url.length - 4) + '.js';\n"
+ " var script = document.createElement('script');\n"
+ " script.type = 'text/javascript';\n"
+ " script.src = url;\n"
+ " script.onload = extensionLoaded;\n"
+ " script.onerror = extensionError;\n"
+ " if (registerScript) document['currentScript'] = script;\n"
+ " document.getElementsByTagName('head')[0].appendChild(script);\n"
+ " pending.push(script);\n"
+ " }\n"
+ " global.bck2brwsr = function() {\n"
+ " var args = Array.prototype.slice.apply(arguments);\n"
+ " var resources = {};\n"
+ " function registerResource(n, a64) {\n"
+ " var frm = atob || window.atob;\n"
+ " var str = frm(a64);\n"
+ " var arr = [];\n"
+ " for (var i = 0; i < str.length; i++) {\n"
+ " var ch = str.charCodeAt(i) & 0xff;\n"
+ " if (ch > 127) ch -= 256;\n"
+ " arr.push(ch);\n"
+ " }\n"
+ " if (!resources[n]) resources[n] = [arr];\n"
+ " else resources[n].push(arr);\n"
+ " }\n"
+ " var vm = fillInVMSkeleton({ 'registerResource' : registerResource });\n"
+ " function initVM() {\n"
+ " var clsArray = vm['java_lang_reflect_Array'];\n"
+ " if (clsArray) clsArray(false);\n"
+ " }\n"
+ " for (var i = 0; i < extensions.length; ++i) {\n"
+ " extensions[i](vm);\n"
+ " }\n"
+ " vm['registerResource'] = null;\n"
+ " var knownExtensions = extensions.length;\n"
+ " var loader = {};\n"
+ " var classPath;\n"
+ " var loadBytes = function(name, skip) {\n"
+ " skip = typeof skip == 'number' ? skip : 0;\n"
+ " var arr = resources[name];\n"
+ " if (arr) {\n"
+ " var arrSize = arr.length;\n"
+ " if (skip < arrSize) return arr[skip];\n"
+ " skip -= arrSize;\n"
+ " } else {\n"
+ " var arrSize = 0;\n"
+ " };\n"
+ " for (var i = 0; i < args.length; i++) {\n"
+ " var at = args[i];\n"
+ " if(!at) continue;\n"
+ " var ret;\n"
+ " if (typeof at === 'string' && at.substring(at.length - 3) === '.js') {\n"
+ " loadExtension(at, document && !document['currentScript']);\n"
+ " args[i] = null;\n"
+ " } else if (typeof at === 'function') ret = at(name, skip);\n"
+ " else {\n"
+ " if (classPath === undefined) {\n"
+ " classPath = null;\n"
+ " try {\n"
+ " classPath = vm.loadClass('org.apidesign.vm4brwsr.ClassPath');\n"
+ " } catch (err) {\n"
+ " }\n"
+ " }\n"
+ " if (!classPath) {\n"
+ " if (name !== 'org/apidesign/vm4brwsr/ClassPath.class') {\n"
+ " throw 'Core Java library not registered. Cannot load from ' + at;\n"
+ " }\n"
+ " ret = null;\n"
+ " } else {\n"
+ " ret = classPath['loadBytes___3BLjava_lang_String_2Ljava_lang_Object_2II'](name, args, i, skip);\n"
+ " }\n"
+ " }\n"
+ " if (ret) return ret;\n"
+ " }\n"
+ " while (knownExtensions < extensions.length) {\n"
+ " vm['registerResource'] = registerResource;\n"
+ " extensions[knownExtensions++](vm);\n"
+ " vm['registerResource'] = null;\n"
+ " initVM();\n"
+ " }\n"
+ " var arr = resources[name];\n"
+ " return (arr && arr.length > arrSize) ? arr[arrSize] : null;\n"
+ " }\n"
+ " var reload = function(name, arr, keep) {\n"
+ " if (!arr) throw 'Cannot find ' + name;\n"
+ " var err = null;\n"
+ " try {\n"
+ " var lazy = loadClass('org.apidesign.vm4brwsr.VMLazy');\n"
+ " } catch (e) {\n"
+ " err = e;\n"
+ " }\n"
+ " if (!lazy) {\n"
+ " throw 'No bck2brwsr VM module to compile ' + name + ':\\n' + err;\n"
+ " }\n"
+ " if (!keep) {\n"
+ " var attr = mangleClass(name);\n"
+ " delete vm[attr];\n"
+ " }\n"
+ " return lazy['load__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_String_2_3Ljava_lang_Object_2_3B']\n"
+ " (vm, name, args, arr);\n"
+ " };\n"
+ " var loadClass = function(name) {\n"
+ " var attr = mangleClass(name);\n"
+ " var fn = vm[attr];\n"
+ " if (fn) {\n"
+ " return fn(false);\n"
+ " };\n"
+ " try {\n"
+ " var arr = loadBytes(replaceAll(name, '.', '/') + '.class');\n"
+ " var newClazz = reload(name, arr, true);\n"
+ " return newClazz;\n"
+ " } catch (err) {\n"
+ " fn = vm[attr];\n"
+ " if (fn) return fn(false);\n"
+ " throw err;\n"
+ " }\n"
+ " }\n"
+ " if (vm['loadClass']) {\n"
+ " throw 'Cannot initialize the bck2brwsr VM twice!';\n"
+ " }\n"
+ " vm['loadClass'] = loadClass;\n"
+ " vm['_reload'] = reload;\n"
+ " vm['loadBytes'] = loadBytes;\n"
+ " initVM();\n"
+ " loader.loadClass = function(name, callback) {\n"
+ " if (pending.length === 0) {\n"
+ " try {\n"
+ " var c = loadClass(name, callback);\n"
+ " var w = wrapJava(vm, name, callback, c);\n"
+ " return w;\n"
+ " } catch (err) {\n"
+ " if (pending.length === 0) throw err;\n"
+ " }\n"
+ " }\n"
+ " pendingClasses.push(vm);\n"
+ " pendingClasses.push(name);\n"
+ " pendingClasses.push(null);\n"
+ " pendingClasses.push(callback);\n"
+ " return {\n"
+ " 'invoke' : function() {\n"
+ " if (pending.length === 0) {\n"
+ " invokeMethod(vm, name, arguments);\n"
+ " return;\n"
+ " }\n"
+ " pendingClasses.push(vm);\n"
+ " pendingClasses.push(name);\n"
+ " pendingClasses.push(arguments);\n"
+ " pendingClasses.push(null);\n"
+ " }\n"
+ " };\n"
+ " }\n"
+ " return loader;\n"
+ " };\n");
out.append(
" global.bck2brwsr.register = function(config, extension) {\n"
+ " if (!config || config['magic'] !== 'kafčo') {\n"
+ " console.log('Will not register: ' + extension);\n"
+ " return false;\n"
+ " }\n"
+ " if (typeof document == 'undefined') {\n"
+ " var cs = null;\n"
+ " } else {\n"
+ " var cs = document['currentScript'];\n"
+ " if (!cs) {\n"
+ " var all = document.getElementsByTagName('script');\n"
+ " var last = all.length;\n"
+ " while (--last >= 0 && !all[last].src) {\n"
+ " }\n"
+ " cs = all[last];\n"
+ " }\n"
+ " }\n"
+ " var csUrl = cs ? cs['src'] : null;\n"
+ " var prefix = csUrl ? csUrl['replace'](/\\/[^\\/]*$/,'/') : '';\n"
+ " extensions.push(extension);\n"
+ " var cp = config['classpath'];\n"
+ " if (cp) for (var i = 0; i < cp.length; i++) {\n"
+ " loadExtension(prefix + cp[i]);\n"
+ " }\n"
+ " return null;\n"
+ " };\n");
out.append("}(this));");
}
@Override
protected String getExportsObject() {
return "vm";
}
@Override
protected boolean isExternalClass(String className) {
return false;
}
@Override
protected void lazyReference(Appendable out, String n) throws IOException {
String cls = n.replace('/', '_');
String dot = n.replace('/', '.');
out.append("\nvm.").append(cls).append(" = function() {");
out.append("\n var instance = arguments.length == 0 || arguments[0] === true;");
out.append("\n delete vm.").append(cls).append(";");
out.append("\n var c = vm.loadClass('").append(dot).append("');");
out.append("\n return vm.").append(cls).append("(instance);");
out.append("\n}");
}
@Override
protected void requireResource(Appendable out, String resourcePath) throws IOException {
requireResourceImpl(out, true, resourcePath);
super.asBinary.remove(resourcePath);
}
}
private static final class Extension extends VM {
private final StringArray extensionClasses;
private final StringArray classpath;
private Extension(Appendable out, Bck2Brwsr.Resources resources,
String[] extClassesArray, StringArray explicitlyExported,
StringArray asBinary, StringArray classpath
) throws IOException {
super(out, resources, explicitlyExported, asBinary);
this.extensionClasses = StringArray.asList(extClassesArray);
this.classpath = classpath;
}
@Override
protected void generatePrologue(Appendable out) throws IOException {
out.append(
"bck2brwsr.register({\n"
+ " 'magic' : 'kafčo'"
);
if (classpath != null && classpath.toArray().length > 0) {
out.append(
",\n 'classpath' : [\n"
);
String sep = " ";
for (String s : classpath.toArray()) {
out.append(sep).append("'").append(s).append("'");
sep = ",\n ";
}
out.append(
"\n ]"
);
}
out.append(
"\n}, function(exports) {\n"
+ " var vm = {};\n");
out.append(" function link(n, assign) {\n"
+ " function replaceAll(s, o, n) {\n"
+ " var pos = 0;\n"
+ " for (;;) {\n"
+ " var indx = s.indexOf(o, pos);\n"
+ " if (indx === -1) {\n"
+ " return s;\n"
+ " }\n"
+ " pos = indx + n.length;\n"
+ " s = s.substring(0, indx) + n + s.substring(indx + o.length);\n"
+ " }\n"
+ " }\n"
+ " return function() {\n"
+ " var no_ = replaceAll(n, '_', '_1');\n"
+ " var cls = replaceAll(no_, '/', '_');\n"
+ " var dot = replaceAll(n, '/', '.');\n"
+ " exports.loadClass(dot);\n"
+ " assign(exports[cls]);\n"
+ " return exports[cls](arguments);\n"
+ " };\n"
+ " };\n"
);
}
@Override
protected void generateEpilogue(Appendable out) throws IOException {
out.append("});");
if (exportedCount == 0) {
throw new IOException("Creating library without any exported symbols is useless!");
}
}
@Override
String accessClass(String className) {
if (this.extensionClasses.contains(className.replace('_', '/'))) {
return className;
}
return super.accessClass(className);
}
@Override
protected String generateClass(Appendable out, String className) throws IOException {
if (isExternalClass(className)) {
final String cls = className.replace("_", "_1").replace('/', '_');
out.append("\n").append(assignClass(cls))
.append("link('")
.append(className)
.append("', function(f) { ").append(assignClass(cls)).append(" f; });");
return null;
}
return super.generateClass(out, className);
}
@Override
protected String getExportsObject() {
return "exports";
}
@Override
protected boolean isExternalClass(String className) {
return !extensionClasses.contains(className);
}
@Override
protected void lazyReference(Appendable out, String n) throws IOException {
String cls = n.replace('/', '_');
out.append("\nvm.").append(cls).append(" = function() {");
out.append("\n var instance = arguments.length == 0 || arguments[0] === true;");
out.append("\n delete vm.").append(cls).append(";");
out.append("\n return link('").append(n).append("', function(f) { vm.");
out.append(cls).append(" = f;})(instance);");
out.append("\n}");
}
@Override
protected void requireResource(Appendable out, String resourcePath) throws IOException {
requireResourceImpl(out, true, resourcePath);
super.asBinary.remove(resourcePath);
}
}
}
