Add utility function to determine if a locale is valid syntax; this will...

chrome/common/extensions/extension_l10n_util.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file declares extension specific l10n utils.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_L10N_UTIL_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_L10N_UTIL_H_
 #pragma once
 
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 // 1. Do nothing if _locales directory is missing (not an error).
 // 2. Get list of Chrome locales.
 // 3. Enumerate all subdirectories of _locales directory.
 // 4. Intersect both lists, and add intersection to the extension.
 // Returns false if any of supplied locales don't match chrome list of locales.
 // Fills out error with offending locale name.
 bool GetValidLocales(const FilePath& locale_path,
                      std::set<std::string>* locales,
                      std::string* error);
 
+// Checks if a string is plausibly a syntactically-valid locale string,
+// for cases where we want the valid input to be a locale string such as
+// 'en', 'pt-BR', 'fil', and 'zh-Hans-CN', but we don't want to limit it
+// to locales that Chrome actually knows about, so 'xx-YY' should be
+// accepted, but 'z', 'German', 'en-$1', or 'abcd-1234' should not.
+// Case-insensitive. Based on RFC 5646.
+bool IsValidLocaleSyntax(const std::string& locale);
+
 // Loads messages file for default locale, and application locales (application
 // locales doesn't have to exist). Application locale is current locale and its
 // parents.
 // Returns message bundle if it can load default locale messages file, and all
 // messages are valid, else returns NULL and sets error.
 ExtensionMessageBundle* LoadMessageCatalogs(
     const FilePath& locale_path,
     const std::string& default_locale,
     const std::string& app_locale,
     const std::set<std::string>& valid_locales,
     std::string* error);
 
 // Returns true if directory has "." in the name (for .svn) or if it doesn't
 // belong to Chrome locales.
 // |locales_path| is extension_id/_locales
 // |locale_path| is extension_id/_locales/xx
 // |all_locales| is a set of all valid Chrome locales.
 bool ShouldSkipValidation(const FilePath& locales_path,
                           const FilePath& locale_path,
                           const std::set<std::string>& all_locales);
 
 }  // namespace extension_l10n_util
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_L10N_UTIL_H_