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// Copyright 2023 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/translate/core/browser/translate_ui_languages_manager.h"
#include <algorithm>
#include "base/i18n/string_compare.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "components/language/core/common/language_experiments.h"
#include "components/language_detection/core/constants.h"
#include "components/strings/grit/components_strings.h"
#include "components/translate/core/browser/language_state.h"
#include "components/translate/core/browser/translate_client.h"
#include "components/translate/core/browser/translate_download_manager.h"
#include "components/translate/core/browser/translate_driver.h"
#include "components/translate/core/common/translate_util.h"
#include "components/variations/variations_associated_data.h"
#include "net/base/url_util.h"
#include "ui/base/l10n/l10n_util.h"
namespace translate {
TranslateUILanguagesManager::TranslateUILanguagesManager(
const std::vector<std::string>& language_codes,
const std::string& source_language,
const std::string& target_language)
: source_language_index_(kNoIndex),
initial_source_language_index_(kNoIndex),
target_language_index_(kNoIndex) {
std::string locale =
TranslateDownloadManager::GetInstance()->application_locale();
// Reserve additional space for unknown language option.
std::vector<std::string>::size_type languages_size = language_codes.size();
languages_size += 1;
languages_.reserve(languages_size);
// Preparing for the alphabetical order in the locale.
std::unique_ptr<icu::Collator> collator = CreateCollator(locale);
for (const std::string& language_code : language_codes) {
std::u16string language_name =
l10n_util::GetDisplayNameForLocale(language_code, locale, true);
languages_.emplace_back(std::move(language_code), std::move(language_name));
}
// Sort |languages_| in alphabetical order according to the display name.
std::sort(
languages_.begin(), languages_.end(),
[&collator](const LanguageNamePair& lhs, const LanguageNamePair& rhs) {
if (collator) {
switch (base::i18n::CompareString16WithCollator(*collator, lhs.second,
rhs.second)) {
case UCOL_LESS:
return true;
case UCOL_GREATER:
return false;
case UCOL_EQUAL:
break;
}
} else {
// |locale| may not be supported by ICU collator (crbug/54833). In
// this case, let's order the languages in UTF-8.
int result = lhs.second.compare(rhs.second);
if (result != 0) {
return result < 0;
}
}
// Matching display names will be ordered alphabetically according to
// the language codes.
return lhs.first < rhs.first;
});
languages_.emplace_back(language_detection::kUnknownLanguageCode,
GetUnknownLanguageDisplayName());
std::rotate(languages_.rbegin(), languages_.rbegin() + 1, languages_.rend());
for (std::vector<LanguageNamePair>::const_iterator iter = languages_.begin();
iter != languages_.end(); ++iter) {
const std::string& language_code = iter->first;
if (language_code == source_language) {
source_language_index_ = iter - languages_.begin();
}
if (language_code == target_language) {
target_language_index_ = iter - languages_.begin();
}
}
}
TranslateUILanguagesManager::~TranslateUILanguagesManager() = default;
std::unique_ptr<icu::Collator> TranslateUILanguagesManager::CreateCollator(
const std::string& locale) {
UErrorCode error = U_ZERO_ERROR;
icu::Locale loc(locale.c_str());
std::unique_ptr<icu::Collator> collator(
icu::Collator::createInstance(loc, error));
if (!collator || !U_SUCCESS(error)) {
return nullptr;
}
collator->setStrength(icu::Collator::PRIMARY);
return collator;
}
size_t TranslateUILanguagesManager::GetNumberOfLanguages() const {
return languages_.size();
}
std::string TranslateUILanguagesManager::GetSourceLanguageCode() const {
return (GetSourceLanguageIndex() == kNoIndex)
? language_detection::kUnknownLanguageCode
: GetLanguageCodeAt(GetSourceLanguageIndex());
}
std::string TranslateUILanguagesManager::GetTargetLanguageCode() const {
return (GetTargetLanguageIndex() == kNoIndex)
? language_detection::kUnknownLanguageCode
: GetLanguageCodeAt(GetTargetLanguageIndex());
}
std::string TranslateUILanguagesManager::GetLanguageCodeAt(size_t index) const {
DCHECK_LT(index, GetNumberOfLanguages());
return languages_[index].first;
}
std::u16string TranslateUILanguagesManager::GetLanguageNameAt(
size_t index) const {
if (index == kNoIndex) {
return std::u16string();
}
DCHECK_LT(index, GetNumberOfLanguages());
return languages_[index].second;
}
bool TranslateUILanguagesManager::UpdateSourceLanguageIndex(
size_t language_index) {
DCHECK_LT(language_index, GetNumberOfLanguages());
if (source_language_index_ == language_index) {
return false;
}
source_language_index_ = language_index;
return true;
}
bool TranslateUILanguagesManager::UpdateSourceLanguage(
const std::string& language_code) {
if (GetSourceLanguageCode() == language_code) {
return false;
}
for (size_t i = 0; i < languages_.size(); ++i) {
if (languages_[i].first.compare(language_code) == 0) {
UpdateSourceLanguageIndex(i);
return true;
}
}
return false;
}
bool TranslateUILanguagesManager::UpdateTargetLanguageIndex(
size_t language_index) {
DCHECK_LT(language_index, GetNumberOfLanguages());
if (target_language_index_ == language_index) {
return false;
}
target_language_index_ = language_index;
return true;
}
bool TranslateUILanguagesManager::UpdateTargetLanguage(
const std::string& language_code) {
if (GetTargetLanguageCode() == language_code) {
return false;
}
for (size_t i = 0; i < languages_.size(); ++i) {
if (languages_[i].first.compare(language_code) == 0) {
UpdateTargetLanguageIndex(i);
return true;
}
}
return false;
}
// static
std::u16string TranslateUILanguagesManager::GetUnknownLanguageDisplayName() {
return l10n_util::GetStringUTF16(IDS_TRANSLATE_DETECTED_LANGUAGE);
}
} // namespace translate
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