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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_LANGUAGE_CORE_BROWSER_ACCEPT_LANGUAGES_SERVICE_H_
#define COMPONENTS_LANGUAGE_CORE_BROWSER_ACCEPT_LANGUAGES_SERVICE_H_
#include <set>
#include <string>
#include <string_view>
#include "components/keyed_service/core/keyed_service.h"
#include "components/prefs/pref_change_registrar.h"
class PrefService;
namespace language {
// AcceptLanguagesService tracks the value of the "Accept-Language" HTTP
// header.
class AcceptLanguagesService : public KeyedService {
public:
// |accept_languages_pref| is the path to the preference storing the accept
// languages.
AcceptLanguagesService(PrefService* prefs, const char* accept_languages_pref);
AcceptLanguagesService(const AcceptLanguagesService&) = delete;
AcceptLanguagesService& operator=(const AcceptLanguagesService&) = delete;
~AcceptLanguagesService() override;
// Returns true if |language| is available as Accept-Languages for the given
// |display_locale|. |language| will be converted if it has the synonym of
// accept language.
static bool CanBeAcceptLanguage(std::string_view language);
// Returns true if the passed language has been configured by the user as an
// accept language. |language| will be converted if it has the synonym of
// accept languages.
bool IsAcceptLanguage(std::string_view language) const;
private:
// Initializes the |accept_languages_| language table based on the associated
// preference in |prefs|.
void InitAcceptLanguages(PrefService* prefs);
// Set of accept languages.
std::set<std::string> accept_languages_;
// Listens to accept languages changes.
PrefChangeRegistrar pref_change_registrar_;
// Path of accept languages preference.
const std::string accept_languages_pref_;
};
} // namespace language
#endif // COMPONENTS_LANGUAGE_CORE_BROWSER_ACCEPT_LANGUAGES_SERVICE_H_
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