Bugzilla

// 12.6.4 The for-in Statement, step 6

ScriptedDirectProxyHandler::enumerate(JSContext *cx, JSObject *proxy_, AutoIdVector &props)

    RootedObject proxy(cx, proxy_);

    // step a

    RootedObject handler(cx, GetDirectProxyHandlerObject(proxy));

    // step b

    RootedObject target(cx, GetProxyTargetObject(proxy));

    // step c

    RootedValue trap(cx);

    if (!handler->getProperty(cx, ATOM(enumerate), &trap))

        return false;

    // step d

    if (trap.isUndefined())

        return DirectProxyHandler::enumerate(cx, proxy_, props);

    // step e

    Value argv[] = {

        ObjectOrNullValue(target)

    };

    RootedValue trapResult(cx);

    if (!Invoke(cx, ObjectValue(*handler), trap, 1, argv, trapResult.address()))

        return false;

    // step f 

    if (trapResult.isPrimitive()) {

        JSAutoByteString bytes;

        if (!js_AtomToPrintableString(cx, ATOM(enumerate), &bytes)) 

            return false;

        RootedValue v(cx, ObjectOrNullValue(proxy));

        js_ReportValueError2(cx, JSMSG_INVALID_TRAP_RESULT, JSDVG_SEARCH_STACK,

                             v, NullPtr(), bytes.ptr());

        return false;

    }

    // steps g-m are shared 

    // FIXME: the trap should return an iterator object, see bug 783826

    return ArrayToIdVector(cx, proxy, target, trapResult, props, ATOM(enumerate));