Examples of org.mozilla.javascript.Context

org.mozilla.javascript.Context
This class represents the runtime context of an executing script. Before executing a script, an instance of Context must be created and associated with the thread that will be executing the script. The Context will be used to store information about the executing of the script such as the call stack. Contexts are associated with the current thread using the {@link #call(ContextAction)}or {@link #enter()} methods.
Different forms of script execution are supported. Scripts may be evaluated from the source directly, or first compiled and then later executed. Interactive execution is also supported.
Some aspects of script execution, such as type conversions and object creation, may be accessed directly through methods of Context. @see Scriptable @author Norris Boyd @author Brendan Eich

    protected void assertJavascript(String expectedOutput, String jsonData, String code, String testInfo) throws IOException {
        // build the code, something like
        //  data = <jsonData> ;
        //  <code>
        final String jsCode = "data=" + jsonData + ";\n" + code;
        final Context rhinoContext = Context.enter();
        final ScriptableObject scope = rhinoContext.initStandardObjects();


        // execute the script, out script variable maps to sw
        final StringWriter sw = new StringWriter();
        final PrintWriter pw = new PrintWriter(sw, true);
        ScriptableObject.putProperty(scope, "out", Context.javaToJS(pw, scope));
        final int lineNumber = 1;
        final Object securityDomain = null;
        rhinoContext.evaluateString(scope, jsCode, getClass().getSimpleName(),
                lineNumber, securityDomain);


        // check script output
        pw.flush();
        final String result = sw.toString().trim();

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      String resultStr = "";
      boolean result = false;


      // now evaluate the condition using JavaScript
      Context cx = Context.enter();
      try {
          Scriptable scope = cx.initStandardObjects(null);
          Object cxResultObject =
            cx.evaluateString(scope, cond
          /*** conditionString ***/
          , "<cmd>", 1, null);
          resultStr = Context.toString(cxResultObject);


          if (resultStr.equals("false")) {

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        initCoffescriptCompiler();
    }


  @Override
  public String compile (String coffeeScriptSource) {
        Context context = Context.enter();
        try {
            Scriptable compileScope = context.newObject(globalScope);
            compileScope.setParentScope(globalScope);
            compileScope.put("coffeeScriptSource", compileScope, coffeeScriptSource);
            try {
                return (String)context.evaluateString(compileScope, String.format("CoffeeScript.compile(coffeeScriptSource, %s);", options.toJavaScript()),
                        "JCoffeeScriptCompiler", 0, null);
            } catch (JavaScriptException e) {
                throw new CoffeeScriptCompileException(e);
            }
        } finally {

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        InputStream inputStream = classLoader.getResourceAsStream("org/jcoffeescript/coffee-script.js");
        try {
            try {
                Reader reader = new InputStreamReader(inputStream, "UTF-8");
                try {
                    Context context = Context.enter();
                    context.setOptimizationLevel(-1); // Without this, Rhino hits a 64K bytecode limit and fails
                    try {
                        globalScope = context.initStandardObjects();
                        context.evaluateReader(globalScope, reader, "coffee-script.js", 0, null);
                    } finally {
                        Context.exit();
                    }
                } finally {
                    reader.close();

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            this.script = script;
            this.converter = converter;
        }


        public XLoper execute(IFunctionContext context, XLoper[] args) throws RequestException {
            Context ctx = Context.enter();
            Object[] oargs = converter.convert(args, BSFScript.createArgHints(args));
            ScriptableObject so = ctx.initStandardObjects();
            Scriptable argsObj = ctx.newArray(so, oargs);
            so.defineProperty("args", argsObj, ScriptableObject.DONTENUM);
            try {
                return converter.createFrom(script.exec(ctx, so));
            } catch (Throwable t) {
                throw new RequestException(t.getMessage());

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    @Override
    public Object evaluate(String script, String filename, Map<String, Object> args)
            throws ScriptException, Throwable {
        RhinoContextFactory factory = new RhinoContextFactory(timeLimit);
        Context cx = factory.enterContext();
        ScriptableObject scriptable = new ImporterTopLevel(cx);
        Scriptable scope = cx.initStandardObjects(scriptable);


        for (Map.Entry<String, Object> entry : args.entrySet()) {
            ScriptableObject.putProperty(scope, entry.getKey(),
                    Context.javaToJS(entry.getValue(), scope));
        }
        try {
            return cx.evaluateString(scope, script, filename, 1, null);
        } catch (Error e) {
            throw new ScriptException(e.getMessage());
        } catch (RhinoException e) {
            if (e instanceof WrappedException) {
                Throwable cause = e.getCause();

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    public RhinoInterpreter() {
        Context.setCachingEnabled(false); // reset the cache
        Context.setCachingEnabled(true);  // enable caching again


        // entering a context
        Context ctx = Context.enter();
        try {
            // init std object with an importer
            // building the importer automatically initialize the
            // context with it since Rhino1.5R3
            ImporterTopLevel importer = new ImporterTopLevel(ctx);
            globalObject = importer;
            // import Java lang package & DOM Level 2 & SVG DOM packages
            NativeJavaPackage[] p= new NativeJavaPackage[TO_BE_IMPORTED.length];
            for (int i = 0; i < TO_BE_IMPORTED.length; i++) {
                p[i] = new NativeJavaPackage(TO_BE_IMPORTED[i]);
            }
            importer.importPackage(ctx, globalObject, p, null);
            ctx.setWrapHandler(wrapHandler);
        } finally {
            Context.exit();
        }
    }

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     * value of the last expression evaluated in the script.
     */
    public Object evaluate(Reader scriptreader)
        throws InterpreterException, IOException {
        Object rv = null;
        Context ctx = Context.enter();
        ctx.setWrapHandler(wrapHandler);
        try {
            rv = ctx.evaluateReader(globalObject,
                                    scriptreader,
                                    "<SVG>",
                                    1, null);
        } catch (JavaScriptException e) {
            // exception from JavaScript (possibly wrapping a Java Ex)

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     * value of the last expression evaluated in the script.
     */
    public Object evaluate(String scriptstr)
        throws InterpreterException {
 
        Context ctx = Context.enter();
        ctx.setWrapHandler(wrapHandler);
        Script script = null;
        Entry et = null;
        Iterator it = compiledScripts.iterator();
        // between nlog(n) and log(n) because it is
        // an AbstractSequentialList
        while (it.hasNext()) {
            if ((et = (Entry)(it.next())).str.equals(scriptstr)) {
                // if it is not at the end, remove it because
                // it will change from place (it is faster
                // to remove it now)
                script = et.script;
                it.remove();
                break;
            }
        }


        if (script == null) {
            // this script has not been compiled yet or has been fogotten
            // since the compilation:
            // compile it and store it for future use.
            try {
                script = ctx.compileReader(globalObject,
                                           new StringReader(scriptstr),
                                           "<SVG>",
                                           1, null);
            } catch (IOException io) {
                // can't happen because we use a String...

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     * the environment of the interpreter.
     * @param name the name of the script object to create
     * @param object the Java object
     */
    public void bindObject(String name, Object object) {
        Context ctx = Context.enter();
        ctx.setWrapHandler(wrapHandler);
        try {
            Scriptable jsObject =  Context.toObject(object, globalObject);
            globalObject.put(name, globalObject, jsObject);
        } finally {
            Context.exit();

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