/* * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.script.javascript;import com.sun.script.util.*;import javax.script.*;import sun.org.mozilla.javascript.internal.*;import java.lang.reflect.Method;import java.io.*;import java.util.*;  /** * Implementation of <code>ScriptEngine</code> using the Mozilla Rhino * interpreter. * * @author Mike Grogan * @author A. Sundararajan * @since 1.6 */public final class RhinoScriptEngine extends AbstractScriptEngine        implements  Invocable, Compilable {     private static final boolean DEBUG = false;     /* Scope where standard JavaScript objects and our     * extensions to it are stored. Note that these are not     * user defined engine level global variables. These are     * variables have to be there on all compliant ECMAScript     * scopes. We put these standard objects in this top level.     */    private RhinoTopLevel topLevel;     /* map used to store indexed properties in engine scope     * refer to comment on 'indexedProps' in ExternalScriptable.java.     */    private Map<Object, Object> indexedProps;     private ScriptEngineFactory factory;    private InterfaceImplementor implementor;     private static final int languageVersion = getLanguageVersion();    private static final int optimizationLevel = getOptimizationLevel();    static {        ContextFactory.initGlobal(new ContextFactory() {            protected Context makeContext() {                Context cx = super.makeContext();                cx.setLanguageVersion(languageVersion);                cx.setOptimizationLevel(optimizationLevel);                cx.setClassShutter(RhinoClassShutter.getInstance());                cx.setWrapFactory(RhinoWrapFactory.getInstance());                return cx;            }        });    }     private static final String RHINO_JS_VERSION = "rhino.js.version";    private static int getLanguageVersion() {        int version;        String tmp = java.security.AccessController.doPrivileged(            new sun.security.action.GetPropertyAction(RHINO_JS_VERSION));        if (tmp != null) {            version = Integer.parseInt((String)tmp);        } else {            version = Context.VERSION_1_8;        }        return version;    }     private static final String RHINO_OPT_LEVEL = "rhino.opt.level";    private static int getOptimizationLevel() {        int optLevel = -1;        // disable optimizer under security manager, for now.        if (System.getSecurityManager() == null) {            optLevel = Integer.getInteger(RHINO_OPT_LEVEL, -1);        }        return optLevel;    }     /**     * Creates a new instance of RhinoScriptEngine     */    public RhinoScriptEngine() {         Context cx = enterContext();        try {            topLevel = new RhinoTopLevel(cx, this);        } finally {            cx.exit();        }         indexedProps = new HashMap<Object, Object>();         //construct object used to implement getInterface        implementor = new InterfaceImplementor(this) {                protected boolean isImplemented(Object thiz, Class<?> iface) {                    Context cx = enterContext();                    try {                        if (thiz != null && !(thiz instanceof Scriptable)) {                            thiz = cx.toObject(thiz, topLevel);                        }                        Scriptable engineScope = getRuntimeScope(context);                        Scriptable localScope = (thiz != null)? (Scriptable) thiz :                                                    engineScope;                        for (Method method : iface.getMethods()) {                            // ignore methods of java.lang.Object class                            if (method.getDeclaringClass() == Object.class) {                                continue;                            }                            Object obj = ScriptableObject.getProperty(localScope, method.getName());                            if (! (obj instanceof Function)) {                                return false;                            }                        }                        return true;                    } finally {                        cx.exit();                    }                }                 protected Object convertResult(Method method, Object res)                                            throws ScriptException {                    Class desiredType = method.getReturnType();                    if (desiredType == Void.TYPE) {                        return null;                    } else {                        return Context.jsToJava(res, desiredType);                    }                }            };    }     public Object eval(Reader reader, ScriptContext ctxt)    throws ScriptException {        Object ret;         Context cx = enterContext();        try {            Scriptable scope = getRuntimeScope(ctxt);            String filename = (String) get(ScriptEngine.FILENAME);            filename = filename == null ? "<Unknown source>" : filename;             ret = cx.evaluateReader(scope, reader, filename , 1,  null);        } catch (RhinoException re) {            if (DEBUG) re.printStackTrace();            int line = (line = re.lineNumber()) == 0 ? -1 : line;            String msg;            if (re instanceof JavaScriptException) {                msg = String.valueOf(((JavaScriptException)re).getValue());            } else {                msg = re.toString();            }            ScriptException se = new ScriptException(msg, re.sourceName(), line);            se.initCause(re);            throw se;        } catch (IOException ee) {            throw new ScriptException(ee);        } finally {            cx.exit();        }         return unwrapReturnValue(ret);    }     public Object eval(String script, ScriptContext ctxt) throws ScriptException {        if (script == null) {            throw new NullPointerException("null script");        }        return eval(new StringReader(script) , ctxt);    }     public ScriptEngineFactory getFactory() {        if (factory != null) {            return factory;        } else {            return new RhinoScriptEngineFactory();        }    }     public Bindings createBindings() {        return new SimpleBindings();    }     //Invocable methods    public Object invokeFunction(String name, Object... args)    throws ScriptException, NoSuchMethodException {        return invoke(null, name, args);    }     public Object invokeMethod(Object thiz, String name, Object... args)    throws ScriptException, NoSuchMethodException {        if (thiz == null) {            throw new IllegalArgumentException("script object can not be null");        }        return invoke(thiz, name, args);    }     private Object invoke(Object thiz, String name, Object... args)    throws ScriptException, NoSuchMethodException {        Context cx = enterContext();        try {            if (name == null) {                throw new NullPointerException("method name is null");            }             if (thiz != null && !(thiz instanceof Scriptable)) {                thiz = cx.toObject(thiz, topLevel);            }             Scriptable engineScope = getRuntimeScope(context);            Scriptable localScope = (thiz != null)? (Scriptable) thiz :                                                    engineScope;            Object obj = ScriptableObject.getProperty(localScope, name);            if (! (obj instanceof Function)) {                throw new NoSuchMethodException("no such method: " + name);            }             Function func = (Function) obj;            Scriptable scope = func.getParentScope();            if (scope == null) {                scope = engineScope;            }            Object result = func.call(cx, scope, localScope,                                      wrapArguments(args));            return unwrapReturnValue(result);        } catch (RhinoException re) {            if (DEBUG) re.printStackTrace();            int line = (line = re.lineNumber()) == 0 ? -1 : line;            ScriptException se = new ScriptException(re.toString(), re.sourceName(), line);            se.initCause(re);            throw se;        } finally {            cx.exit();        }    }     public <T> T getInterface(Class<T> clasz) {        try {            return implementor.getInterface(null, clasz);        } catch (ScriptException e) {            return null;        }    }     public <T> T getInterface(Object thiz, Class<T> clasz) {        if (thiz == null) {            throw new IllegalArgumentException("script object can not be null");        }         try {            return implementor.getInterface(thiz, clasz);        } catch (ScriptException e) {            return null;        }    }     private static final String printSource =            "function print(str, newline) {                \n" +            "    if (typeof(str) == 'undefined') {         \n" +            "        str = 'undefined';                    \n" +            "    } else if (str == null) {                 \n" +            "        str = 'null';                         \n" +            "    }                                         \n" +            "    var out = context.getWriter();            \n" +            "    if (!(out instanceof java.io.PrintWriter))\n" +            "        out = new java.io.PrintWriter(out);   \n" +            "    out.print(String(str));                   \n" +            "    if (newline) out.print('\\n');            \n" +            "    out.flush();                              \n" +            "}\n" +            "function println(str) {                       \n" +            "    print(str, true);                         \n" +            "}";     Scriptable getRuntimeScope(ScriptContext ctxt) {        if (ctxt == null) {            throw new NullPointerException("null script context");        }         // we create a scope for the given ScriptContext        Scriptable newScope = new ExternalScriptable(ctxt, indexedProps);         // Set the prototype of newScope to be 'topLevel' so that        // JavaScript standard objects are visible from the scope.        newScope.setPrototype(topLevel);         // define "context" variable in the new scope        newScope.put("context", newScope, ctxt);         // define "print", "println" functions in the new scope        Context cx = enterContext();        try {            cx.evaluateString(newScope, printSource, "print", 1, null);        } finally {            cx.exit();        }        return newScope;    }      //Compilable methods    public CompiledScript compile(String script) throws ScriptException {        return compile(new StringReader(script));    }     public CompiledScript compile(java.io.Reader script) throws ScriptException {        CompiledScript ret = null;        Context cx = enterContext();         try {            String fileName = (String) get(ScriptEngine.FILENAME);            if (fileName == null) {                fileName = "<Unknown Source>";            }             Scriptable scope = getRuntimeScope(context);            Script scr = cx.compileReader(scope, script, fileName, 1, null);            ret = new RhinoCompiledScript(this, scr);        } catch (Exception e) {            if (DEBUG) e.printStackTrace();            throw new ScriptException(e);        } finally {            cx.exit();        }        return ret;    }      //package-private helpers     static Context enterContext() {        // call this always so that initializer of this class runs        // and initializes custom wrap factory and class shutter.        return Context.enter();    }     void setEngineFactory(ScriptEngineFactory fac) {        factory = fac;    }     Object[] wrapArguments(Object[] args) {        if (args == null) {            return Context.emptyArgs;        }        Object[] res = new Object[args.length];        for (int i = 0; i < res.length; i++) {            res[i] = Context.javaToJS(args[i], topLevel);        }        return res;    }     Object unwrapReturnValue(Object result) {        if (result instanceof Wrapper) {            result = ( (Wrapper) result).unwrap();        }         return result instanceof Undefined ? null : result;    }     /*    public static void main(String[] args) throws Exception {        if (args.length == 0) {            System.out.println("No file specified");            return;        }         InputStreamReader r = new InputStreamReader(new FileInputStream(args[0]));        ScriptEngine engine = new RhinoScriptEngine();         engine.put("x", "y");        engine.put(ScriptEngine.FILENAME, args[0]);        engine.eval(r);        System.out.println(engine.get("x"));    }    */}