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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/language_detection/language_detection_model.h"
#include <map>
#include <string>
#include <string_view>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/types/expected.h"
#include "components/language_detection/content/common/language_detection.mojom-blink.h"
#include "components/language_detection/content/renderer/language_detection_model_manager.h"
#include "components/language_detection/core/language_detection_model.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/blink/public/common/thread_safe_browser_interface_broker_proxy.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
void LanguageDetectionModel::LoadModelFile(
base::File model_file,
CreateLanguageDetectionModelCallback callback) {
language_detection_model_.UpdateWithFileAsync(
std::move(model_file),
WTF::BindOnce(
[](LanguageDetectionModel* model,
CreateLanguageDetectionModelCallback callback) {
if (!model || !model->language_detection_model_.IsAvailable()) {
std::move(callback).Run(
base::unexpected(DetectLanguageError::kUnavailable));
return;
}
std::move(callback).Run(model);
},
WrapWeakPersistent(this), std::move(callback)));
}
void LanguageDetectionModel::Trace(Visitor* visitor) const {}
void LanguageDetectionModel::DetectLanguage(
scoped_refptr<base::SequencedTaskRunner>& task_runner,
const WTF::String& text,
DetectLanguageCallback on_complete) {
if (!language_detection_model_.IsAvailable()) {
std::move(on_complete)
.Run(base::unexpected(blink::DetectLanguageError::kUnavailable));
return;
}
task_runner->PostTask(
FROM_HERE,
WTF::BindOnce(&LanguageDetectionModel::DetectLanguageImpl,
WrapPersistent(this), text, std::move(on_complete)));
}
void LanguageDetectionModel::DetectLanguageImpl(
const WTF::String& text,
DetectLanguageCallback on_complete) {
WTF::String text_16 = text;
text_16.Ensure16Bit();
auto score_by_language =
language_detection_model_.PredictWithScan(text_16.View16());
WTF::Vector<LanguagePrediction> predictions;
predictions.reserve(static_cast<wtf_size_t>(score_by_language.size()));
for (const auto& it : score_by_language) {
predictions.emplace_back(it.language, it.score);
}
std::move(on_complete).Run(predictions);
}
int64_t LanguageDetectionModel::GetModelSize() const {
if (!language_detection_model_.IsAvailable()) {
return 0;
}
return language_detection_model_.GetModelSize();
}
} // namespace blink
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