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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "components/translate/core/browser/translate_accept_languages.h"
      6 
      7 #include "base/bind.h"
      8 #include "base/prefs/pref_service.h"
      9 #include "base/strings/string_split.h"
     10 #include "base/strings/string_util.h"
     11 #include "components/translate/core/browser/translate_download_manager.h"
     12 #include "components/translate/core/common/translate_util.h"
     13 #include "ui/base/l10n/l10n_util.h"
     14 
     15 TranslateAcceptLanguages::TranslateAcceptLanguages(
     16     PrefService* prefs,
     17     const char* accept_languages_pref)
     18     : accept_languages_pref_(accept_languages_pref) {
     19   InitAcceptLanguages(prefs);
     20 
     21   // Also start listening for changes in the accept languages.
     22   pref_change_registrar_.Init(prefs);
     23   pref_change_registrar_.Add(
     24       accept_languages_pref,
     25       base::Bind(&TranslateAcceptLanguages::InitAcceptLanguages,
     26                  base::Unretained(this),
     27                  prefs));
     28 }
     29 
     30 TranslateAcceptLanguages::~TranslateAcceptLanguages() {
     31 }
     32 
     33 // static
     34 bool TranslateAcceptLanguages::CanBeAcceptLanguage(
     35     const std::string& language) {
     36   std::string accept_language = language;
     37   translate::ToChromeLanguageSynonym(&accept_language);
     38 
     39   const std::string locale =
     40       TranslateDownloadManager::GetInstance()->application_locale();
     41   std::vector<std::string> accept_language_codes;
     42   l10n_util::GetAcceptLanguagesForLocale(locale, &accept_language_codes);
     43 
     44   if (std::find(accept_language_codes.begin(),
     45                 accept_language_codes.end(),
     46                 accept_language) != accept_language_codes.end()) {
     47     return true;
     48   }
     49 
     50   return false;
     51 }
     52 
     53 bool TranslateAcceptLanguages::IsAcceptLanguage(const std::string& language) {
     54   std::string accept_language = language;
     55   translate::ToChromeLanguageSynonym(&accept_language);
     56   return accept_languages_.find(accept_language) != accept_languages_.end();
     57 }
     58 
     59 void TranslateAcceptLanguages::InitAcceptLanguages(PrefService* prefs) {
     60   DCHECK(prefs);
     61   // Build the languages.
     62   accept_languages_.clear();
     63   std::string accept_langs_str = prefs->GetString(
     64       accept_languages_pref_.c_str());
     65   std::vector<std::string> accept_langs_list;
     66   base::SplitString(accept_langs_str, ',', &accept_langs_list);
     67   std::vector<std::string>::const_iterator iter;
     68 
     69   for (iter = accept_langs_list.begin();
     70        iter != accept_langs_list.end(); ++iter) {
     71     // Get rid of the locale extension if any (ex: en-US -> en), but for Chinese
     72     // for which the CLD reports zh-CN and zh-TW.
     73     std::string accept_lang(*iter);
     74     size_t index = iter->find("-");
     75     if (index != std::string::npos && *iter != "zh-CN" && *iter != "zh-TW")
     76       accept_lang = iter->substr(0, index);
     77 
     78     accept_languages_.insert(accept_lang);
     79   }
     80 }
     81 
     82