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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/components/quick_answers/utils/spell_checker.h"
#include "base/logging.h"
#include "base/strings/string_split.h"
#include "base/types/expected.h"
#include "chromeos/components/quick_answers/public/cpp/quick_answers_prefs.h"
#include "chromeos/constants/chromeos_features.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "ui/base/l10n/l10n_util.h"
namespace quick_answers {
namespace {
bool ShouldDownloadDictionaries() {
if (QuickAnswersState::IsEnabled()) {
return true;
}
// Spell checker dictionaries are required to show a consent UI by Quick
// Answers code. Note that `IsEligibleAs` always returns false if current
// feature type does not match specified feature type, e.g., this
// `IsEligibleAs` always returns false for `kHmr` case.
return QuickAnswersState::IsEligibleAs(
QuickAnswersState::FeatureType::kQuickAnswers) &&
QuickAnswersState::GetConsentStatusAs(
QuickAnswersState::FeatureType::kQuickAnswers) ==
quick_answers::prefs::ConsentStatus::kUnknown;
}
} // namespace
SpellChecker::SpellChecker(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
: url_loader_factory_(url_loader_factory) {
quick_answers_state_observation_.Observe(QuickAnswersState::Get());
}
SpellChecker::~SpellChecker() {
spellcheck_languages_.clear();
}
void SpellChecker::CheckSpelling(const std::string& word,
CheckSpellingCallback callback) {
auto iterator = spellcheck_languages_.begin();
if (iterator == spellcheck_languages_.end()) {
std::move(callback).Run(false, std::string());
return;
}
iterator->get()->CheckSpelling(
word,
base::BindOnce(&SpellChecker::CollectResults, base::Unretained(this),
word, std::move(callback), iterator,
iterator->get()->language(), languages_list_version_));
}
void SpellChecker::OnSettingsEnabled(bool enabled) {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/false);
}
void SpellChecker::OnConsentStatusUpdated(prefs::ConsentStatus status) {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/false);
}
void SpellChecker::OnApplicationLocaleReady(const std::string& locale) {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/true);
}
void SpellChecker::OnPreferredLanguagesChanged(
const std::string& preferred_languages) {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/true);
}
void SpellChecker::OnEligibilityChanged(bool eligible) {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/false);
}
void SpellChecker::OnPrefsInitialized() {
CheckEligibilityAndUpdateLanguages(/*should_recreate_languages_list=*/false);
}
void SpellChecker::CheckEligibilityAndUpdateLanguages(
bool should_recreate_languages_list) {
// Still waiting for all of the states to be ready.
// TODO(b/340628526): remove this once all `QuickAnswersState` field become
// able to handle uinitialized cases. Callers should not need to care
// `QuickAnswersState` instance level initialization state.
if (!QuickAnswersState::Get()->prefs_initialized()) {
return;
}
if (!ShouldDownloadDictionaries()) {
spellcheck_languages_.clear();
languages_list_version_++;
return;
}
// Return if languages list is already initialized and no need to recreate.
if (!spellcheck_languages_.empty() && !should_recreate_languages_list) {
return;
}
// Add application language.
std::set<std::string> languages;
languages.insert(std::string(
l10n_util::GetLanguage(QuickAnswersState::Get()->application_locale())));
// Add preferred languages if supported.
auto preferred_languages_list =
base::SplitString(QuickAnswersState::Get()->preferred_languages(), ",",
base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
for (const std::string& locale : preferred_languages_list) {
auto language = l10n_util::GetLanguage(locale);
if (QuickAnswersState::Get()->IsSupportedLanguage(language))
languages.insert(std::string(language));
}
spellcheck_languages_.clear();
languages_list_version_++;
for (auto language : languages) {
spellcheck_languages_.push_back(
std::make_unique<SpellCheckLanguage>(url_loader_factory_));
spellcheck_languages_.back()->Initialize(language);
}
}
void SpellChecker::CollectResults(const std::string& word,
CheckSpellingCallback callback,
SpellCheckLanguageIterator iterator,
const std::string& language,
int languages_list_version,
bool is_correct) {
if (is_correct) {
std::move(callback).Run(true, language);
return;
}
// The languages list has been updated, return false for the current call.
if (languages_list_version != languages_list_version_) {
std::move(callback).Run(false, std::string());
return;
}
iterator++;
if (iterator == spellcheck_languages_.end()) {
std::move(callback).Run(false, std::string());
return;
}
iterator->get()->CheckSpelling(
word,
base::BindOnce(&SpellChecker::CollectResults, base::Unretained(this),
word, std::move(callback), iterator,
iterator->get()->language(), languages_list_version));
}
} // namespace quick_answers
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