add isRTL innerkits to i18n

Signed-off-by: sunyaozu <sunyaozu@huawei.com>

interfaces/native/innerkits/i18n/include/locale_util.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef I18N_STANDARD_ISRTL_LOCALE_UTIL_H
+#define I18N_STANDARD_ISRTL_LOCALE_UTIL_H
+
+#include <string>
+
+#include "locid.h"
+
+namespace OHOS {
+namespace Global {
+namespace I18n {
+static inline bool IsRTL(const std::string &locale)
+{
+    icu::Locale curLocale(locale.c_str());
+    return curLocale.isRightToLeft();
+}
+}
+}
+}
+#endif