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    Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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    /* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript;

import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import org.mozilla.javascript.ScriptRuntime.StringIdOrIndex;

/**
 * This class implements the Object native object. See ECMA 15.2.
 *
 * @author Norris Boyd
 */
public class NativeObject extends IdScriptableObject implements Map {
    private static final long serialVersionUID = -6345305608474346996L;

    private static final Object OBJECT_TAG = "Object";

    static void init(Scriptable scope, boolean sealed) {
        NativeObject obj = new NativeObject();
        obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
    }

    @Override
    public String getClassName() {
        return "Object";
    }

    @Override
    public String toString() {
        return ScriptRuntime.defaultObjectToString(this);
    }

    @Override
    protected void fillConstructorProperties(IdFunctionObject ctor) {
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_getPrototypeOf, "getPrototypeOf", 1);
        if (Context.getCurrentContext().version >= Context.VERSION_ES6) {
            addIdFunctionProperty(
                    ctor, OBJECT_TAG, ConstructorId_setPrototypeOf, "setPrototypeOf", 2);
            addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_entries, "entries", 1);
            addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_fromEntries, "fromEntries", 1);
            addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_values, "values", 1);
            addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_hasOwn, "hasOwn", 1);
        }
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_keys, "keys", 1);
        addIdFunctionProperty(
                ctor, OBJECT_TAG, ConstructorId_getOwnPropertyNames, "getOwnPropertyNames", 1);
        addIdFunctionProperty(
                ctor, OBJECT_TAG, ConstructorId_getOwnPropertySymbols, "getOwnPropertySymbols", 1);
        addIdFunctionProperty(
                ctor,
                OBJECT_TAG,
                ConstructorId_getOwnPropertyDescriptor,
                "getOwnPropertyDescriptor",
                2);
        addIdFunctionProperty(
                ctor,
                OBJECT_TAG,
                ConstructorId_getOwnPropertyDescriptors,
                "getOwnPropertyDescriptors",
                1);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_defineProperty, "defineProperty", 3);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_isExtensible, "isExtensible", 1);
        addIdFunctionProperty(
                ctor, OBJECT_TAG, ConstructorId_preventExtensions, "preventExtensions", 1);
        addIdFunctionProperty(
                ctor, OBJECT_TAG, ConstructorId_defineProperties, "defineProperties", 2);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_create, "create", 2);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_isSealed, "isSealed", 1);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_isFrozen, "isFrozen", 1);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_seal, "seal", 1);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_freeze, "freeze", 1);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_assign, "assign", 2);
        addIdFunctionProperty(ctor, OBJECT_TAG, ConstructorId_is, "is", 2);
        super.fillConstructorProperties(ctor);
    }

    @Override
    protected void initPrototypeId(int id) {
        String s;
        int arity;
        switch (id) {
            case Id_constructor:
                arity = 1;
                s = "constructor";
                break;
            case Id_toString:
                arity = 0;
                s = "toString";
                break;
            case Id_toLocaleString:
                arity = 0;
                s = "toLocaleString";
                break;
            case Id_valueOf:
                arity = 0;
                s = "valueOf";
                break;
            case Id_hasOwnProperty:
                arity = 1;
                s = "hasOwnProperty";
                break;
            case Id_propertyIsEnumerable:
                arity = 1;
                s = "propertyIsEnumerable";
                break;
            case Id_isPrototypeOf:
                arity = 1;
                s = "isPrototypeOf";
                break;
            case Id_toSource:
                arity = 0;
                s = "toSource";
                break;
            case Id___defineGetter__:
                arity = 2;
                s = "__defineGetter__";
                break;
            case Id___defineSetter__:
                arity = 2;
                s = "__defineSetter__";
                break;
            case Id___lookupGetter__:
                arity = 1;
                s = "__lookupGetter__";
                break;
            case Id___lookupSetter__:
                arity = 1;
                s = "__lookupSetter__";
                break;
            default:
                throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(OBJECT_TAG, id, s, arity);
    }

    @Override
    public Object execIdCall(
            IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
        if (!f.hasTag(OBJECT_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        switch (id) {
            case Id_constructor:
                {
                    if (thisObj != null) {
                        // BaseFunction.construct will set up parent, proto
                        return f.construct(cx, scope, args);
                    }
                    if (args.length == 0 || args[0] == null || Undefined.isUndefined(args[0])) {
                        return cx.newObject(scope);
                    }
                    return ScriptRuntime.toObject(cx, scope, args[0]);
                }

            case Id_toLocaleString:
                {
                    if (thisObj == null) {
                        throw ScriptRuntime.notFunctionError(null);
                    }
                    Object toString = ScriptableObject.getProperty(thisObj, "toString");
                    if (!(toString instanceof Callable)) {
                        throw ScriptRuntime.notFunctionError(toString);
                    }
                    Callable fun = (Callable) toString;
                    return fun.call(cx, scope, thisObj, ScriptRuntime.emptyArgs);
                }

            case Id_toString:
                {
                    if (cx.hasFeature(Context.FEATURE_TO_STRING_AS_SOURCE)) {
                        String s =
                                ScriptRuntime.defaultObjectToSource(
                                        cx, scope,
                                        thisObj, args);
                        int L = s.length();
                        if (L != 0 && s.charAt(0) == '(' && s.charAt(L - 1) == ')') {
                            // Strip () that surrounds toSource
                            s = s.substring(1, L - 1);
                        }
                        return s;
                    }
                    return ScriptRuntime.defaultObjectToString(thisObj);
                }

            case Id_valueOf:
                if (cx.getLanguageVersion() >= Context.VERSION_1_8
                        && (thisObj == null || Undefined.isUndefined(thisObj))) {
                    throw ScriptRuntime.typeErrorById(
                            "msg." + (thisObj == null ? "null" : "undef") + ".to.object");
                }
                return thisObj;

            case Id_hasOwnProperty:
                {
                    if (cx.getLanguageVersion() >= Context.VERSION_1_8
                            && (thisObj == null || Undefined.isUndefined(thisObj))) {
                        throw ScriptRuntime.typeErrorById(
                                "msg." + (thisObj == null ? "null" : "undef") + ".to.object");
                    }

                    Object arg = args.length < 1 ? Undefined.instance : args[0];

                    return AbstractEcmaObjectOperations.hasOwnProperty(cx, thisObj, arg);
                }

            case Id_propertyIsEnumerable:
                {
                    if (cx.getLanguageVersion() >= Context.VERSION_1_8
                            && (thisObj == null || Undefined.isUndefined(thisObj))) {
                        throw ScriptRuntime.typeErrorById(
                                "msg." + (thisObj == null ? "null" : "undef") + ".to.object");
                    }

                    boolean result;
                    Object arg = args.length < 1 ? Undefined.instance : args[0];

                    if (arg instanceof Symbol) {
                        result = ((SymbolScriptable) thisObj).has((Symbol) arg, thisObj);
                        result = result && isEnumerable((Symbol) arg, thisObj);
                    } else {
                        StringIdOrIndex s = ScriptRuntime.toStringIdOrIndex(arg);
                        // When checking if a property is enumerable, a missing property should
                        // return "false" instead of
                        // throwing an exception.  See: https://github.com/mozilla/rhino/issues/415
                        try {
                            if (s.stringId == null) {
                                result = thisObj.has(s.index, thisObj);
                                result = result && isEnumerable(s.index, thisObj);
                            } else {
                                result = thisObj.has(s.stringId, thisObj);
                                result = result && isEnumerable(s.stringId, thisObj);
                            }
                        } catch (EvaluatorException ee) {
                            if (ee.getMessage()
                                    .startsWith(
                                            ScriptRuntime.getMessageById(
                                                    "msg.prop.not.found",
                                                    s.stringId == null
                                                            ? Integer.toString(s.index)
                                                            : s.stringId))) {
                                result = false;
                            } else {
                                throw ee;
                            }
                        }
                    }
                    return ScriptRuntime.wrapBoolean(result);
                }

            case Id_isPrototypeOf:
                {
                    if (cx.getLanguageVersion() >= Context.VERSION_1_8
                            && (thisObj == null || Undefined.isUndefined(thisObj))) {
                        throw ScriptRuntime.typeErrorById(
                                "msg." + (thisObj == null ? "null" : "undef") + ".to.object");
                    }

                    boolean result = false;
                    if (args.length != 0 && args[0] instanceof Scriptable) {
                        Scriptable v = (Scriptable) args[0];
                        do {
                            v = v.getPrototype();
                            if (v == thisObj) {
                                result = true;
                                break;
                            }
                        } while (v != null);
                    }
                    return ScriptRuntime.wrapBoolean(result);
                }

            case Id_toSource:
                return ScriptRuntime.defaultObjectToSource(cx, scope, thisObj, args);
            case Id___defineGetter__:
            case Id___defineSetter__:
                {
                    if (args.length < 2 || !(args[1] instanceof Callable)) {
                        Object badArg = (args.length >= 2 ? args[1] : Undefined.instance);
                        throw ScriptRuntime.notFunctionError(badArg);
                    }
                    if (!(thisObj instanceof ScriptableObject)) {
                        throw Context.reportRuntimeErrorById(
                                "msg.extend.scriptable",
                                thisObj == null ? "null" : thisObj.getClass().getName(),
                                String.valueOf(args[0]));
                    }
                    ScriptableObject so = (ScriptableObject) thisObj;
                    StringIdOrIndex s = ScriptRuntime.toStringIdOrIndex(args[0]);
                    int index = s.stringId != null ? 0 : s.index;
                    Callable getterOrSetter = (Callable) args[1];
                    boolean isSetter = (id == Id___defineSetter__);
                    so.setGetterOrSetter(s.stringId, index, getterOrSetter, isSetter);
                    if (so instanceof NativeArray) ((NativeArray) so).setDenseOnly(false);
                }
                return Undefined.instance;

            case Id___lookupGetter__:
            case Id___lookupSetter__:
                {
                    if (args.length < 1 || !(thisObj instanceof ScriptableObject))
                        return Undefined.instance;

                    ScriptableObject so = (ScriptableObject) thisObj;
                    StringIdOrIndex s = ScriptRuntime.toStringIdOrIndex(args[0]);
                    int index = s.stringId != null ? 0 : s.index;
                    boolean isSetter = (id == Id___lookupSetter__);
                    Object gs;
                    for (; ; ) {
                        gs = so.getGetterOrSetter(s.stringId, index, this, isSetter);
                        if (gs != null) {
                            break;
                        }
                        // If there is no getter or setter for the object itself,
                        // how about the prototype?
                        Scriptable v = so.getPrototype();
                        if (v == null) {
                            break;
                        }
                        if (v instanceof ScriptableObject) {
                            so = (ScriptableObject) v;
                        } else {
                            break;
                        }
                    }
                    if (gs != null) {
                        return gs;
                    }
                }
                return Undefined.instance;

            case ConstructorId_getPrototypeOf:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable obj = getCompatibleObject(cx, scope, arg);
                    return obj.getPrototype();
                }
            case ConstructorId_setPrototypeOf:
                {
                    if (args.length < 2) {
                        throw ScriptRuntime.typeErrorById(
                                "msg.method.missing.parameter",
                                "Object.setPrototypeOf",
                                "2",
                                Integer.toString(args.length));
                    }
                    Scriptable proto = (args[1] == null) ? null : ensureScriptable(args[1]);
                    if (proto instanceof Symbol) {
                        throw ScriptRuntime.typeErrorById(
                                "msg.arg.not.object", ScriptRuntime.typeof(proto));
                    }

                    final Object arg0 = args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6) {
                        ScriptRuntimeES6.requireObjectCoercible(cx, arg0, f);
                    }
                    if (!(arg0 instanceof ScriptableObject)) {
                        return arg0;
                    }
                    ScriptableObject obj = (ScriptableObject) arg0;
                    if (!obj.isExtensible()) {
                        throw ScriptRuntime.typeErrorById("msg.not.extensible");
                    }

                    // cycle detection
                    Scriptable prototypeProto = proto;
                    while (prototypeProto != null) {
                        if (prototypeProto == obj) {
                            throw ScriptRuntime.typeErrorById(
                                    "msg.object.cyclic.prototype", obj.getClass().getSimpleName());
                        }
                        prototypeProto = prototypeProto.getPrototype();
                    }
                    obj.setPrototype(proto);
                    return obj;
                }
            case ConstructorId_keys:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable obj = getCompatibleObject(cx, scope, arg);
                    Object[] ids = obj.getIds();
                    for (int i = 0; i < ids.length; i++) {
                        ids[i] = ScriptRuntime.toString(ids[i]);
                    }
                    return cx.newArray(scope, ids);
                }

            case ConstructorId_entries:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable obj = getCompatibleObject(cx, scope, arg);
                    Object[] ids = obj.getIds();
                    int j = 0;
                    for (int i = 0; i < ids.length; i++) {
                        if (ids[i] instanceof Integer) {
                            int intId = (Integer) ids[i];
                            if (obj.has(intId, obj) && isEnumerable(intId, obj)) {
                                String stringId = ScriptRuntime.toString(ids[i]);
                                Object[] entry = new Object[] {stringId, obj.get(intId, obj)};
                                ids[j++] = cx.newArray(scope, entry);
                            }
                        } else {
                            String stringId = ScriptRuntime.toString(ids[i]);
                            if (obj.has(stringId, obj) && isEnumerable(stringId, obj)) {
                                Object[] entry = new Object[] {stringId, obj.get(stringId, obj)};
                                ids[j++] = cx.newArray(scope, entry);
                            }
                        }
                    }
                    if (j != ids.length) {
                        ids = Arrays.copyOf(ids, j);
                    }
                    return cx.newArray(scope, ids);
                }
            case ConstructorId_fromEntries:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    arg = getCompatibleObject(cx, scope, arg);
                    Scriptable obj = cx.newObject(scope);
                    ScriptRuntime.loadFromIterable(
                            cx,
                            scope,
                            arg,
                            (key, value) -> {
                                if (key instanceof Integer) {
                                    obj.put((Integer) key, obj, value);
                                } else if (key instanceof Symbol
                                        && obj instanceof SymbolScriptable) {
                                    ((SymbolScriptable) obj).put((Symbol) key, obj, value);
                                } else {
                                    obj.put(ScriptRuntime.toString(key), obj, value);
                                }
                            });
                    return obj;
                }
            case ConstructorId_values:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable obj = getCompatibleObject(cx, scope, arg);
                    Object[] ids = obj.getIds();
                    int j = 0;
                    for (int i = 0; i < ids.length; i++) {
                        if (ids[i] instanceof Integer) {
                            int intId = (Integer) ids[i];
                            if (obj.has(intId, obj) && isEnumerable(intId, obj)) {
                                ids[j++] = obj.get(intId, obj);
                            }
                        } else {
                            String stringId = ScriptRuntime.toString(ids[i]);
                            // getter may remove keys
                            if (obj.has(stringId, obj) && isEnumerable(stringId, obj)) {
                                ids[j++] = obj.get(stringId, obj);
                            }
                        }
                    }
                    if (j != ids.length) {
                        ids = Arrays.copyOf(ids, j);
                    }
                    return cx.newArray(scope, ids);
                }
            case ConstructorId_hasOwn:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Object propertyName = args.length < 2 ? Undefined.instance : args[1];
                    return AbstractEcmaObjectOperations.hasOwnProperty(cx, arg, propertyName);
                }
            case ConstructorId_getOwnPropertyNames:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable s = getCompatibleObject(cx, scope, arg);
                    ScriptableObject obj = ensureScriptableObject(s);
                    Object[] ids = obj.getIds(true, false);
                    for (int i = 0; i < ids.length; i++) {
                        ids[i] = ScriptRuntime.toString(ids[i]);
                    }
                    return cx.newArray(scope, ids);
                }
            case ConstructorId_getOwnPropertySymbols:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable s = getCompatibleObject(cx, scope, arg);
                    ScriptableObject obj = ensureScriptableObject(s);
                    Object[] ids = obj.getIds(true, true);
                    ArrayList syms = new ArrayList<>();
                    for (Object o : ids) {
                        if (o instanceof Symbol) {
                            syms.add(o);
                        }
                    }
                    return cx.newArray(scope, syms.toArray());
                }
            case ConstructorId_getOwnPropertyDescriptor:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    // TODO(norris): There's a deeper issue here if
                    // arg instanceof Scriptable. Should we create a new
                    // interface to admit the new ECMAScript 5 operations?
                    Scriptable s = getCompatibleObject(cx, scope, arg);
                    ScriptableObject obj = ensureScriptableObject(s);
                    Object nameArg = args.length < 2 ? Undefined.instance : args[1];
                    Scriptable desc = obj.getOwnPropertyDescriptor(cx, nameArg);
                    return desc == null ? Undefined.instance : desc;
                }
            case ConstructorId_getOwnPropertyDescriptors:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable s = getCompatibleObject(cx, scope, arg);
                    ScriptableObject obj = ensureScriptableObject(s);

                    ScriptableObject descs = (ScriptableObject) cx.newObject(scope);
                    for (Object key : obj.getIds(true, true)) {
                        Scriptable desc = obj.getOwnPropertyDescriptor(cx, key);
                        if (desc == null) {
                            continue;
                        } else if (key instanceof Symbol) {
                            descs.put((Symbol) key, descs, desc);
                        } else if (key instanceof Integer) {
                            descs.put((Integer) key, descs, desc);
                        } else {
                            descs.put(ScriptRuntime.toString(key), descs, desc);
                        }
                    }
                    return descs;
                }
            case ConstructorId_defineProperty:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    ScriptableObject obj = ensureScriptableObject(arg);
                    Object name = args.length < 2 ? Undefined.instance : args[1];
                    Object descArg = args.length < 3 ? Undefined.instance : args[2];
                    ScriptableObject desc = ensureScriptableObject(descArg);
                    obj.defineOwnProperty(cx, name, desc);
                    return obj;
                }
            case ConstructorId_isExtensible:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return Boolean.FALSE;
                    }

                    ScriptableObject obj = ensureScriptableObject(arg);
                    return Boolean.valueOf(obj.isExtensible());
                }
            case ConstructorId_preventExtensions:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return arg;
                    }

                    ScriptableObject obj = ensureScriptableObject(arg);
                    obj.preventExtensions();
                    return obj;
                }
            case ConstructorId_defineProperties:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    ScriptableObject obj = ensureScriptableObject(arg);
                    Object propsObj = args.length < 2 ? Undefined.instance : args[1];
                    Scriptable props = Context.toObject(propsObj, scope);
                    obj.defineOwnProperties(cx, ensureScriptableObject(props));
                    return obj;
                }
            case ConstructorId_create:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    Scriptable obj = (arg == null) ? null : ensureScriptable(arg);

                    ScriptableObject newObject = new NativeObject();
                    newObject.setParentScope(scope);
                    newObject.setPrototype(obj);

                    if (args.length > 1 && !Undefined.isUndefined(args[1])) {
                        Scriptable props = Context.toObject(args[1], scope);
                        newObject.defineOwnProperties(cx, ensureScriptableObject(props));
                    }

                    return newObject;
                }
            case ConstructorId_isSealed:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return Boolean.TRUE;
                    }

                    return AbstractEcmaObjectOperations.testIntegrityLevel(
                            cx, arg, AbstractEcmaObjectOperations.INTEGRITY_LEVEL.SEALED);
                }
            case ConstructorId_isFrozen:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return Boolean.TRUE;
                    }

                    return AbstractEcmaObjectOperations.testIntegrityLevel(
                            cx, arg, AbstractEcmaObjectOperations.INTEGRITY_LEVEL.FROZEN);
                }
            case ConstructorId_seal:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return arg;
                    }

                    AbstractEcmaObjectOperations.setIntegrityLevel(
                            cx, arg, AbstractEcmaObjectOperations.INTEGRITY_LEVEL.SEALED);

                    return arg;
                }
            case ConstructorId_freeze:
                {
                    Object arg = args.length < 1 ? Undefined.instance : args[0];
                    if (cx.getLanguageVersion() >= Context.VERSION_ES6
                            && !(arg instanceof ScriptableObject)) {
                        return arg;
                    }

                    AbstractEcmaObjectOperations.setIntegrityLevel(
                            cx, arg, AbstractEcmaObjectOperations.INTEGRITY_LEVEL.FROZEN);

                    return arg;
                }

            case ConstructorId_assign:
                {
                    Scriptable targetObj;
                    if (args.length > 0) {
                        targetObj = ScriptRuntime.toObject(cx, scope, args[0]);
                    } else {
                        targetObj = ScriptRuntime.toObject(cx, scope, Undefined.instance);
                    }
                    for (int i = 1; i < args.length; i++) {
                        if ((args[i] == null) || Undefined.isUndefined(args[i])) {
                            continue;
                        }
                        Scriptable sourceObj = ScriptRuntime.toObject(cx, scope, args[i]);
                        Object[] ids = sourceObj.getIds();
                        for (Object key : ids) {
                            if (key instanceof Integer) {
                                int intId = (Integer) key;
                                if (sourceObj.has(intId, sourceObj)
                                        && isEnumerable(intId, sourceObj)) {
                                    Object val = sourceObj.get(intId, sourceObj);
                                    AbstractEcmaObjectOperations.put(
                                            cx, targetObj, intId, val, true);
                                }
                            } else {
                                String stringId = ScriptRuntime.toString(key);
                                if (sourceObj.has(stringId, sourceObj)
                                        && isEnumerable(stringId, sourceObj)) {
                                    Object val = sourceObj.get(stringId, sourceObj);
                                    AbstractEcmaObjectOperations.put(
                                            cx, targetObj, stringId, val, true);
                                }
                            }
                        }
                    }
                    return targetObj;
                }

            case ConstructorId_is:
                {
                    Object a1 = args.length < 1 ? Undefined.instance : args[0];
                    Object a2 = args.length < 2 ? Undefined.instance : args[1];
                    return ScriptRuntime.wrapBoolean(ScriptRuntime.same(a1, a2));
                }

            default:
                throw new IllegalArgumentException(String.valueOf(id));
        }
    }

    private boolean isEnumerable(int index, Object obj) {
        if (obj instanceof ScriptableObject) {
            ScriptableObject so = (ScriptableObject) obj;
            int attrs = so.getAttributes(index);
            return (attrs & ScriptableObject.DONTENUM) == 0;
        } else {
            return true;
        }
    }

    private boolean isEnumerable(String key, Object obj) {
        if (obj instanceof ScriptableObject) {
            ScriptableObject so = (ScriptableObject) obj;
            int attrs = so.getAttributes(key);
            return (attrs & ScriptableObject.DONTENUM) == 0;
        } else {
            return true;
        }
    }

    private boolean isEnumerable(Symbol sym, Object obj) {
        if (obj instanceof ScriptableObject) {
            ScriptableObject so = (ScriptableObject) obj;
            int attrs = so.getAttributes(sym);
            return (attrs & ScriptableObject.DONTENUM) == 0;
        } else {
            return true;
        }
    }

    private static Scriptable getCompatibleObject(Context cx, Scriptable scope, Object arg) {
        if (cx.getLanguageVersion() >= Context.VERSION_ES6) {
            Scriptable s = ScriptRuntime.toObject(cx, scope, arg);
            return ensureScriptable(s);
        }
        return ensureScriptable(arg);
    }

    // methods implementing java.util.Map

    @Override
    public boolean containsKey(Object key) {
        if (key instanceof String) {
            return has((String) key, this);
        } else if (key instanceof Number) {
            return has(((Number) key).intValue(), this);
        }
        return false;
    }

    @Override
    public boolean containsValue(Object value) {
        for (Object obj : values()) {
            if (value == obj || value != null && value.equals(obj)) {
                return true;
            }
        }
        return false;
    }

    @Override
    public Object remove(Object key) {
        Object value = get(key);
        if (key instanceof String) {
            delete((String) key);
        } else if (key instanceof Number) {
            delete(((Number) key).intValue());
        }
        return value;
    }

    @Override
    public Set keySet() {
        return new KeySet();
    }

    @Override
    public Collection values() {
        return new ValueCollection();
    }

    @Override
    public Set> entrySet() {
        return new EntrySet();
    }

    @Override
    public Object put(Object key, Object value) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void putAll(Map m) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void clear() {
        throw new UnsupportedOperationException();
    }

    class EntrySet extends AbstractSet> {
        @Override
        public Iterator> iterator() {
            return new Iterator>() {
                Object[] ids = getIds();
                Object key = null;
                int index = 0;

                @Override
                public boolean hasNext() {
                    return index < ids.length;
                }

                @Override
                public Map.Entry next() {
                    final Object ekey = key = ids[index++];
                    final Object value = get(key);
                    return new Map.Entry() {
                        @Override
                        public Object getKey() {
                            return ekey;
                        }

                        @Override
                        public Object getValue() {
                            return value;
                        }

                        @Override
                        public Object setValue(Object value) {
                            throw new UnsupportedOperationException();
                        }

                        @Override
                        public boolean equals(Object other) {
                            if (!(other instanceof Map.Entry)) {
                                return false;
                            }
                            Map.Entry e = (Map.Entry) other;
                            return (ekey == null ? e.getKey() == null : ekey.equals(e.getKey()))
                                    && (value == null
                                            ? e.getValue() == null
                                            : value.equals(e.getValue()));
                        }

                        @Override
                        public int hashCode() {
                            return (ekey == null ? 0 : ekey.hashCode())
                                    ^ (value == null ? 0 : value.hashCode());
                        }

                        @Override
                        public String toString() {
                            return ekey + "=" + value;
                        }
                    };
                }

                @Override
                public void remove() {
                    if (key == null) {
                        throw new IllegalStateException();
                    }
                    NativeObject.this.remove(key);
                    key = null;
                }
            };
        }

        @Override
        public int size() {
            return NativeObject.this.size();
        }
    }

    class KeySet extends AbstractSet {

        @Override
        public boolean contains(Object key) {
            return containsKey(key);
        }

        @Override
        public Iterator iterator() {
            return new Iterator() {
                Object[] ids = getIds();
                Object key;
                int index = 0;

                @Override
                public boolean hasNext() {
                    return index < ids.length;
                }

                @Override
                public Object next() {
                    try {
                        return (key = ids[index++]);
                    } catch (ArrayIndexOutOfBoundsException e) {
                        key = null;
                        throw new NoSuchElementException();
                    }
                }

                @Override
                public void remove() {
                    if (key == null) {
                        throw new IllegalStateException();
                    }
                    NativeObject.this.remove(key);
                    key = null;
                }
            };
        }

        @Override
        public int size() {
            return NativeObject.this.size();
        }
    }

    class ValueCollection extends AbstractCollection {

        @Override
        public Iterator iterator() {
            return new Iterator() {
                Object[] ids = getIds();
                Object key;
                int index = 0;

                @Override
                public boolean hasNext() {
                    return index < ids.length;
                }

                @Override
                public Object next() {
                    return get((key = ids[index++]));
                }

                @Override
                public void remove() {
                    if (key == null) {
                        throw new IllegalStateException();
                    }
                    NativeObject.this.remove(key);
                    key = null;
                }
            };
        }

        @Override
        public int size() {
            return NativeObject.this.size();
        }
    }

    @Override
    protected int findPrototypeId(String s) {
        int id;
        switch (s) {
            case "constructor":
                id = Id_constructor;
                break;
            case "toString":
                id = Id_toString;
                break;
            case "toLocaleString":
                id = Id_toLocaleString;
                break;
            case "valueOf":
                id = Id_valueOf;
                break;
            case "hasOwnProperty":
                id = Id_hasOwnProperty;
                break;
            case "propertyIsEnumerable":
                id = Id_propertyIsEnumerable;
                break;
            case "isPrototypeOf":
                id = Id_isPrototypeOf;
                break;
            case "toSource":
                id = Id_toSource;
                break;
            case "__defineGetter__":
                id = Id___defineGetter__;
                break;
            case "__defineSetter__":
                id = Id___defineSetter__;
                break;
            case "__lookupGetter__":
                id = Id___lookupGetter__;
                break;
            case "__lookupSetter__":
                id = Id___lookupSetter__;
                break;
            default:
                id = 0;
                break;
        }
        return id;
    }

    private static final int ConstructorId_getPrototypeOf = -1,
            ConstructorId_keys = -2,
            ConstructorId_getOwnPropertyNames = -3,
            ConstructorId_getOwnPropertyDescriptor = -4,
            ConstructorId_getOwnPropertyDescriptors = -5,
            ConstructorId_defineProperty = -6,
            ConstructorId_isExtensible = -7,
            ConstructorId_preventExtensions = -8,
            ConstructorId_defineProperties = -9,
            ConstructorId_create = -10,
            ConstructorId_isSealed = -11,
            ConstructorId_isFrozen = -12,
            ConstructorId_seal = -13,
            ConstructorId_freeze = -14,
            ConstructorId_getOwnPropertySymbols = -15,
            ConstructorId_assign = -16,
            ConstructorId_is = -17,

            // ES6
            ConstructorId_setPrototypeOf = -18,
            ConstructorId_entries = -19,
            ConstructorId_fromEntries = -20,
            ConstructorId_values = -21,
            ConstructorId_hasOwn = -22,
            Id_constructor = 1,
            Id_toString = 2,
            Id_toLocaleString = 3,
            Id_valueOf = 4,
            Id_hasOwnProperty = 5,
            Id_propertyIsEnumerable = 6,
            Id_isPrototypeOf = 7,
            Id_toSource = 8,
            Id___defineGetter__ = 9,
            Id___defineSetter__ = 10,
            Id___lookupGetter__ = 11,
            Id___lookupSetter__ = 12,
            MAX_PROTOTYPE_ID = 12;
}
    
    
    
    

    




    
    
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