C++ Value::isBoolean方法代码示例

void
nsGeolocationService::HandleMozsettingChanged(const PRUnichar* aData)
{
    // The string that we're interested in will be a JSON string that looks like:
    //  {"key":"gelocation.enabled","value":true}

    SafeAutoJSContext cx;

    nsDependentString dataStr(aData);
    JS::Value val;
    if (!JS_ParseJSON(cx, dataStr.get(), dataStr.Length(), &val) || !val.isObject()) {
      return;
    }

    JSObject &obj(val.toObject());
    JS::Value key;
    if (!JS_GetProperty(cx, &obj, "key", &key) || !key.isString()) {
      return;
    }

    JSBool match;
    if (!JS_StringEqualsAscii(cx, key.toString(), GEO_SETINGS_ENABLED, &match) || (match != JS_TRUE)) {
      return;
    }

    JS::Value value;
    if (!JS_GetProperty(cx, &obj, "value", &value) || !value.isBoolean()) {
      return;
    }

    HandleMozsettingValue(value.toBoolean());
}

void
nsGeolocationSettings::HandleGeolocationAlaEnabledChange(const JS::Value& aVal)
{
  if (!aVal.isBoolean()) {
    return;
  }

  mAlaEnabled = aVal.toBoolean();
}

    NS_IMETHOD Handle(const nsAString& aName, const JS::Value& aResult)
    {
        MOZ_ASSERT(NS_IsMainThread());

        // The geolocation is enabled by default:
        bool value = true;
        if (aResult.isBoolean()) {
            value = aResult.toBoolean();
        }

        MozSettingValue(value);
        return NS_OK;
    }

NS_IMETHODIMP
SmsFilter::SetRead(JSContext* aCx, const JS::Value& aRead)
{
  if (aRead == JSVAL_NULL) {
    mData.read() = eReadState_Unknown;
    return NS_OK;
  }

  if (!aRead.isBoolean()) {
    return NS_ERROR_INVALID_ARG;
  }

  mData.read() = aRead.toBoolean() ? eReadState_Read : eReadState_Unread;
  return NS_OK;
}

std::string
gjs_debug_value(JS::Value v)
{
    std::ostringstream out;
    if (v.isNull())
        return "null";
    if (v.isUndefined())
        return "undefined";
    if (v.isInt32()) {
        out << v.toInt32();
        return out.str();
    }
    if (v.isDouble()) {
        out << v.toDouble();
        return out.str();
    }
    if (v.isString()) {
        out << gjs_debug_string(v.toString());
        return out.str();
    }
    if (v.isSymbol()) {
        out << gjs_debug_symbol(v.toSymbol());
        return out.str();
    }
    if (v.isObject() && js::IsFunctionObject(&v.toObject())) {
        JSFunction* fun = JS_GetObjectFunction(&v.toObject());
        JSString *display_name = JS_GetFunctionDisplayId(fun);
        if (display_name)
            out << "<function " << gjs_debug_string(display_name);
        else
            out << "<unnamed function";
        out << " at " << fun << '>';
        return out.str();
    }
    if (v.isObject()) {
        out << gjs_debug_object(&v.toObject());
        return out.str();
    }
    if (v.isBoolean())
        return (v.toBoolean() ? "true" : "false");
    if (v.isMagic())
        return "<magic>";
    return "unexpected value";
}

  NS_DECL_ISUPPORTS

  NS_IMETHOD Handle(const nsAString& aName, const JS::Value& aResult)
  {
    MOZ_ASSERT(NS_IsMainThread());

    if (!aResult.isBoolean()) {
      NS_WARNING("Setting for '" BLUETOOTH_ENABLED_SETTING "' is not a boolean!");
      return NS_OK;
    }

    // It is theoretically possible to shut down before the first settings check
    // has completed (though extremely unlikely).
    if (gBluetoothService) {
      return gBluetoothService->HandleStartupSettingsCheck(aResult.toBoolean());
    }

    return NS_OK;
  }

nsresult
BluetoothService::HandleSettingsChanged(const nsAString& aData)
{
  MOZ_ASSERT(NS_IsMainThread());

  // The string that we're interested in will be a JSON string that looks like:
  //  {"key":"bluetooth.enabled","value":true}

  JSContext* cx = nsContentUtils::GetSafeJSContext();
  if (!cx) {
    return NS_OK;
  }

  JS::Value val;
  if (!JS_ParseJSON(cx, aData.BeginReading(), aData.Length(), &val)) {
    return JS_ReportPendingException(cx) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
  }

  if (!val.isObject()) {
    return NS_OK;
  }

  JSObject& obj(val.toObject());

  JS::Value key;
  if (!JS_GetProperty(cx, &obj, "key", &key)) {
    MOZ_ASSERT(!JS_IsExceptionPending(cx));
    return NS_ERROR_OUT_OF_MEMORY;
  }

  if (!key.isString()) {
    return NS_OK;
  }

  JSBool match;
  if (!JS_StringEqualsAscii(cx, key.toString(), BLUETOOTH_ENABLED_SETTING,
                            &match)) {
    MOZ_ASSERT(!JS_IsExceptionPending(cx));
    return NS_ERROR_OUT_OF_MEMORY;
  }

  if (!match) {
    return NS_OK;
  }

  JS::Value value;
  if (!JS_GetProperty(cx, &obj, "value", &value)) {
    MOZ_ASSERT(!JS_IsExceptionPending(cx));
    return NS_ERROR_OUT_OF_MEMORY;
  }

  if (!value.isBoolean()) {
    MOZ_ASSERT(false, "Expecting a boolean for 'bluetooth.enabled'!");
    return NS_ERROR_UNEXPECTED;
  }

  if (value.toBoolean() == IsEnabled()) {
    // Nothing to do here.
    return NS_OK;
  }

  nsresult rv;

  if (IsEnabled()) {
    rv = Stop();
    NS_ENSURE_SUCCESS(rv, rv);

    return NS_OK;
  }

  rv = Start();
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

/*! @brief Fill a bottle with the contents of an object.
 @param[in] jct The %JavaScript engine context.
 @param[in,out] aBottle The bottle to be filled.
 @param[in] theData The value to be sent.
 @param[in] topLevel @c true if this is the outermost list of an object. */
static void
fillBottleFromValue(JSContext *        jct,
                    yarp::os::Bottle & aBottle,
                    JS::Value          theData,
                    const bool         topLevel)
{
    ODL_ENTER(); //####
    ODL_P2("jct = ", jct, "aBottle = ", &aBottle); //####
    ODL_B1("topLevel = ", topLevel); //####
    JS::RootedValue asRootedValue(jct);

    asRootedValue = theData;
    if (theData.isBoolean())
    {
        aBottle.addInt(JS::ToBoolean(asRootedValue) ? 1 : 0);
    }
    else if (theData.isDouble())
    {
        double aValue;

        if (JS::ToNumber(jct, asRootedValue, &aValue))
        {
            aBottle.addDouble(aValue);
        }
    }
    else if (theData.isInt32())
    {
        int32_t aValue;

        if (JS::ToInt32(jct, asRootedValue, &aValue))
        {
            aBottle.addInt(aValue);
        }
    }
    else if (theData.isString())
    {
        JSString * asString = theData.toString();
        char *     asChars = JS_EncodeString(jct, asString);

        aBottle.addString(asChars);
        JS_free(jct, asChars);
    }
    else if (theData.isObject())
    {
        JS::RootedObject asObject(jct);

        if (JS_ValueToObject(jct, asRootedValue, &asObject))
        {
            bool processed = false;
#if (47 <= MOZJS_MAJOR_VERSION)
            bool isArray;
#endif // 47 <= MOZJS_MAJOR_VERSION

#if (47 <= MOZJS_MAJOR_VERSION)
            if (JS_IsArrayObject(jct, asObject, &isArray))
#else // 47 > MOZJS_MAJOR_VERSION
            if (JS_IsArrayObject(jct, asObject))
#endif // 47 > MOZJS_MAJOR_VERSION
            {
                uint32_t arrayLength;

                if (JS_GetArrayLength(jct, asObject, &arrayLength))
                {
                    // Treat as a list
                    if (topLevel)
                    {
                        for (uint32_t ii = 0; arrayLength > ii; ++ii)
                        {
                            JS::RootedValue anElement(jct);

                            if (JS_GetElement(jct, asObject, ii, &anElement))
                            {
                                fillBottleFromValue(jct, aBottle, anElement, false);
                            }
                        }
                    }
                    else
                    {
                        yarp::os::Bottle & innerList(aBottle.addList());

                        for (uint32_t ii = 0; arrayLength > ii; ++ii)
                        {
                            JS::RootedValue anElement(jct);

                            if (JS_GetElement(jct, asObject, ii, &anElement))
                            {
                                fillBottleFromValue(jct, innerList, anElement, false);
                            }
                        }

                    }
                    processed = true;
                }
            }
            if (! processed)
//.........这里部分代码省略.........

nsresult
BluetoothManager::HandleMozsettingChanged(const PRUnichar* aData)
{
  // The string that we're interested in will be a JSON string that looks like:
  //  {"key":"bluetooth.enabled","value":true}
  nsresult rv;

  nsIScriptContext* sc = GetContextForEventHandlers(&rv);
  if (NS_FAILED(rv)) {
    return NS_ERROR_UNEXPECTED;
  }

  JSContext *cx = sc->GetNativeContext();
  if (!cx) {
    return NS_OK;
  }

  // In the following [if] blocks, NS_OK will be returned even if JS_* functions
  // return false. That's because this function gets called whenever mozSettings
  // changes, so that we'll receive signals we're not interested in and it would
  // be one of the reasons for making JS_* functions return false.
  nsDependentString dataStr(aData);
  JS::Value val;
  if (!JS_ParseJSON(cx, dataStr.get(), dataStr.Length(), &val)) {
    return NS_OK;
  }

  if (!val.isObject()) {
    return NS_OK;
  }

  JSObject &obj(val.toObject());
  JS::Value key;
  if (!JS_GetProperty(cx, &obj, "key", &key)) {
    return NS_OK;
  }

  if (!key.isString()) {
    return NS_OK;
  }

  JSBool match;
  if (!JS_StringEqualsAscii(cx, key.toString(), "bluetooth.enabled", &match)) {
    return NS_OK;
  }

  if (!match) {
    return NS_OK;
  }

  JS::Value value;
  if (!JS_GetProperty(cx, &obj, "value", &value)) {
    return NS_OK;
  }

  if (!value.isBoolean()) {
    return NS_OK;
  }

  BluetoothService* bs = BluetoothService::Get();
  if (!bs) {
    NS_WARNING("BluetoothService not available!");
    return NS_ERROR_FAILURE;
  }

  bool enabled = value.toBoolean();
  nsCOMPtr<nsIRunnable> resultTask = new ToggleBtResultTask(this, enabled);

  if (enabled) {
    if (NS_FAILED(bs->Start(resultTask))) {
      return NS_ERROR_FAILURE;
    }
  } else {
    if (NS_FAILED(bs->Stop(resultTask))) {
      return NS_ERROR_FAILURE;
    }
  }

  return NS_OK;
}