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
15namespace translate {
16
17TranslateAcceptLanguages::TranslateAcceptLanguages(
18    PrefService* prefs,
19    const char* accept_languages_pref)
20    : accept_languages_pref_(accept_languages_pref) {
21  InitAcceptLanguages(prefs);
22
23  // Also start listening for changes in the accept languages.
24  pref_change_registrar_.Init(prefs);
25  pref_change_registrar_.Add(
26      accept_languages_pref,
27      base::Bind(&TranslateAcceptLanguages::InitAcceptLanguages,
28                 base::Unretained(this),
29                 prefs));
30}
31
32TranslateAcceptLanguages::~TranslateAcceptLanguages() {
33}
34
35// static
36bool TranslateAcceptLanguages::CanBeAcceptLanguage(
37    const std::string& language) {
38  std::string accept_language = language;
39  translate::ToChromeLanguageSynonym(&accept_language);
40
41  const std::string locale =
42      TranslateDownloadManager::GetInstance()->application_locale();
43  std::vector<std::string> accept_language_codes;
44  l10n_util::GetAcceptLanguagesForLocale(locale, &accept_language_codes);
45
46  if (std::find(accept_language_codes.begin(),
47                accept_language_codes.end(),
48                accept_language) != accept_language_codes.end()) {
49    return true;
50  }
51
52  return false;
53}
54
55bool TranslateAcceptLanguages::IsAcceptLanguage(const std::string& language) {
56  std::string accept_language = language;
57  translate::ToChromeLanguageSynonym(&accept_language);
58  return accept_languages_.find(accept_language) != accept_languages_.end();
59}
60
61void TranslateAcceptLanguages::InitAcceptLanguages(PrefService* prefs) {
62  DCHECK(prefs);
63  // Build the languages.
64  accept_languages_.clear();
65  std::string accept_langs_str = prefs->GetString(
66      accept_languages_pref_.c_str());
67  std::vector<std::string> accept_langs_list;
68  base::SplitString(accept_langs_str, ',', &accept_langs_list);
69  std::vector<std::string>::const_iterator iter;
70
71  for (iter = accept_langs_list.begin();
72       iter != accept_langs_list.end(); ++iter) {
73    // Get rid of the locale extension if any (ex: en-US -> en), but for Chinese
74    // for which the CLD reports zh-CN and zh-TW.
75    std::string accept_lang(*iter);
76    size_t index = iter->find("-");
77    if (index != std::string::npos && *iter != "zh-CN" && *iter != "zh-TW")
78      accept_lang = iter->substr(0, index);
79
80    accept_languages_.insert(accept_lang);
81  }
82}
83
84}  // namespace translate
85