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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/input_method/grammar_service_client.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_offset_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "chromeos/services/machine_learning/public/cpp/service_connection.h"
#include "components/prefs/pref_service.h"
#include "components/spellcheck/browser/pref_names.h"
#include "components/user_prefs/user_prefs.h"
#include "ui/gfx/range/range.h"
namespace ash {
namespace input_method {
namespace {
using ::chromeos::machine_learning::mojom::GrammarCheckerQuery;
using ::chromeos::machine_learning::mojom::GrammarCheckerQueryPtr;
using ::chromeos::machine_learning::mojom::GrammarCheckerResult;
using ::chromeos::machine_learning::mojom::GrammarCheckerResultPtr;
using ::chromeos::machine_learning::mojom::LoadModelResult;
using ::chromeos::machine_learning::mojom::TextLanguagePtr;
const uint32_t kMaxQueryLength = 200;
const uint32_t kMinQueryLength = 5;
const double kLanguageConfidenceThreshold = 0.9;
const char kEnglishLocale[] = "en";
} // namespace
GrammarServiceClient::GrammarServiceClient() {
weak_this_ = weak_factory_.GetWeakPtr();
}
GrammarServiceClient::~GrammarServiceClient() = default;
void GrammarServiceClient::OnLoadGrammarCheckerDone(
GrammarCheckerQueryPtr query,
const std::string& query_text,
TextCheckCompleteCallback callback,
LoadModelResult result) {
grammar_checker_loaded_ = result == LoadModelResult::OK;
if (!grammar_checker_loaded_) {
std::move(callback).Run(false, {});
return;
}
grammar_checker_->Check(
std::move(query),
base::BindOnce(&GrammarServiceClient::ParseGrammarCheckerResult,
weak_this_, query_text, std::move(callback)));
}
void GrammarServiceClient::OnLoadTextClassifierDone(
const std::string& query_text,
TextCheckCompleteCallback callback,
LoadModelResult result) {
text_classifier_loaded_ = result == LoadModelResult::OK;
if (!text_classifier_loaded_) {
std::move(callback).Run(false, {});
return;
}
text_classifier_->FindLanguages(
query_text, base::BindOnce(&GrammarServiceClient::OnLanguageDetectionDone,
weak_this_, query_text, std::move(callback)));
}
bool GrammarServiceClient::RequestTextCheck(
Profile* profile,
const std::u16string& text,
TextCheckCompleteCallback callback) {
if (!profile || !IsAvailable(profile) || text.size() > kMaxQueryLength ||
text.size() < kMinQueryLength) {
std::move(callback).Run(false, {});
return false;
}
if (text_classifier_loaded_) {
text_classifier_->FindLanguages(
base::UTF16ToUTF8(text),
base::BindOnce(&GrammarServiceClient::OnLanguageDetectionDone,
weak_this_, base::UTF16ToUTF8(text),
std::move(callback)));
return true;
}
if (!text_classifier_.is_bound()) {
chromeos::machine_learning::ServiceConnection::GetInstance()
->GetMachineLearningService()
.LoadTextClassifier(
text_classifier_.BindNewPipeAndPassReceiver(),
base::BindOnce(&GrammarServiceClient::OnLoadTextClassifierDone,
weak_this_, base::UTF16ToUTF8(text),
std::move(callback)));
return true;
}
std::move(callback).Run(false, {});
return false;
}
void GrammarServiceClient::OnLanguageDetectionDone(
const std::string& query_text,
TextCheckCompleteCallback callback,
std::vector<TextLanguagePtr> languages) {
if (languages.empty() ||
languages[0]->confidence < kLanguageConfidenceThreshold ||
languages[0]->locale != kEnglishLocale) {
std::move(callback).Run(false, {});
return;
}
auto query = GrammarCheckerQuery::New();
query->text = query_text;
query->language = languages[0]->locale;
if (grammar_checker_loaded_) {
grammar_checker_->Check(
std::move(query),
base::BindOnce(&GrammarServiceClient::ParseGrammarCheckerResult,
weak_this_, query_text, std::move(callback)));
return;
}
if (!grammar_checker_.is_bound()) {
chromeos::machine_learning::ServiceConnection::GetInstance()
->GetMachineLearningService()
.LoadGrammarChecker(
grammar_checker_.BindNewPipeAndPassReceiver(),
base::BindOnce(&GrammarServiceClient::OnLoadGrammarCheckerDone,
weak_this_, std::move(query), query_text,
std::move(callback)));
return;
}
std::move(callback).Run(false, {});
}
void GrammarServiceClient::ParseGrammarCheckerResult(
const std::string& query_text,
TextCheckCompleteCallback callback,
GrammarCheckerResultPtr result) const {
if (result->status == GrammarCheckerResult::Status::OK &&
!result->candidates.empty()) {
const auto& top_candidate = result->candidates.front();
if (!top_candidate->text.empty() && !top_candidate->fragments.empty()) {
std::vector<ui::GrammarFragment> grammar_results;
for (const auto& fragment : top_candidate->fragments) {
uint32_t end;
if (!base::CheckAdd(fragment->offset, fragment->length)
.AssignIfValid(&end) ||
end > query_text.size()) {
DLOG(ERROR) << "Grammar checker returns invalid correction "
"fragment, offset: "
<< fragment->offset << ", length: " << fragment->length
<< ", but the text length is " << query_text.size();
} else {
// Compute the offsets in string16.
std::vector<size_t> offsets = {fragment->offset, end};
base::UTF8ToUTF16AndAdjustOffsets(query_text, &offsets);
grammar_results.emplace_back(gfx::Range(offsets[0], offsets[1]),
fragment->replacement);
}
}
std::move(callback).Run(true, grammar_results);
return;
}
}
std::move(callback).Run(false, {});
}
bool GrammarServiceClient::IsAvailable(Profile* profile) const {
const PrefService* pref = profile->GetPrefs();
DCHECK(pref);
// If prefs don't allow spell checking, if the profile is off the record, the
// grammar service should be unavailable.
return pref->GetBoolean(spellcheck::prefs::kSpellCheckEnable) &&
!profile->IsOffTheRecord();
}
} // namespace input_method
} // namespace ash
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