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

app/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 contains utility functions for dealing with localized
 // content.
 
 #ifndef APP_L10N_UTIL_H_
 #define APP_L10N_UTIL_H_
 #pragma once
@@ skipping 38 matching lines @@
 // it returns "French". To get the display name of
 // |locale| in the UI language of Chrome, |display_locale| can be
 // set to the return value of g_browser_process->GetApplicationLocale()
 // in the UI thread.
 // If |is_for_ui| is true, U+200F is appended so that it can be
 // rendered properly in a RTL Chrome.
 string16 GetDisplayNameForLocale(const std::string& locale,
                                  const std::string& display_locale,
                                  bool is_for_ui);
 
+// Converts all - into _, to be consistent with ICU and file system names.
+std::string NormalizeLocale(const std::string& locale);
+
+// Produce a vector of parent locales for given locale.
+// It includes the current locale in the result.
+// sr_Cyrl_RS generates sr_Cyrl_RS, sr_Cyrl and sr.
+void GetParentLocales(const std::string& current_locale,
+                      std::vector<std::string>* parent_locales);
+
+// 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', 'es-419', 'zh-Hans-CN', 'i-klingon' or
+// 'de_DE@collation=phonebook', 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 BCP 47, see:
+//   http://unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers
+bool IsValidLocaleSyntax(const std::string& locale);
+
 //
 // Mac Note: See l10n_util_mac.h for some NSString versions and other support.
 //
 
 // Pulls resource string from the string bundle and returns it.
 std::wstring GetString(int message_id);
 std::string GetStringUTF8(int message_id);
 string16 GetStringUTF16(int message_id);
 
 // Get a resource string and replace $1-$2-$3 with |a| and |b|
@@ skipping 115 matching lines @@
 const std::vector<std::string>& GetAvailableLocales();
 
 // Returns a vector of locale codes usable for accept-languages.
 void GetAcceptLanguagesForLocale(const std::string& display_locale,
                                  std::vector<std::string>* locale_codes);
 
 
 }  // namespace l10n_util
 
 #endif  // APP_L10N_UTIL_H_