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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.
#include "components/language/core/browser/accept_languages_service.h"
#include <stddef.h>
#include <string_view>
#include "base/functional/bind.h"
#include "base/i18n/rtl.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "components/language/core/common/language_util.h"
#include "components/prefs/pref_service.h"
#include "ui/base/l10n/l10n_util.h"
namespace language {
AcceptLanguagesService::AcceptLanguagesService(
PrefService* prefs,
const char* accept_languages_pref)
: accept_languages_pref_(accept_languages_pref) {
InitAcceptLanguages(prefs);
// Also start listening for changes in the accept languages.
pref_change_registrar_.Init(prefs);
pref_change_registrar_.Add(
accept_languages_pref,
base::BindRepeating(&AcceptLanguagesService::InitAcceptLanguages,
base::Unretained(this), prefs));
}
AcceptLanguagesService::~AcceptLanguagesService() = default;
// static
bool AcceptLanguagesService::CanBeAcceptLanguage(std::string_view language) {
std::string accept_language(language);
language::ToChromeLanguageSynonym(&accept_language);
const std::string ui_locale = base::i18n::GetConfiguredLocale();
return l10n_util::IsAcceptLanguageDisplayable(ui_locale, accept_language);
}
bool AcceptLanguagesService::IsAcceptLanguage(std::string_view language) const {
std::string accept_language(language);
language::ToChromeLanguageSynonym(&accept_language);
return accept_languages_.find(accept_language) != accept_languages_.end();
}
void AcceptLanguagesService::InitAcceptLanguages(PrefService* prefs) {
DCHECK(prefs);
// Build the languages.
accept_languages_.clear();
std::string accept_languages_pref = prefs->GetString(accept_languages_pref_);
for (std::string_view lang :
base::SplitStringPiece(accept_languages_pref, ",", base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL)) {
// Get rid of the locale extension if any (ex: en-US -> en), but for Chinese
// for which the CLD reports zh-CN and zh-TW.
size_t index = lang.find('-');
if (index != std::string_view::npos && lang != "zh-CN" && lang != "zh-TW") {
accept_languages_.insert(std::string(lang.substr(0, index)));
}
accept_languages_.insert(std::string(lang));
}
}
} // namespace language
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