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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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LANGUAGE_DETECTION_LANGUAGE_DETECTION_MODEL_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LANGUAGE_DETECTION_LANGUAGE_DETECTION_MODEL_H_
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ref.h"
#include "base/types/expected.h"
#include "components/language_detection/content/common/language_detection.mojom-blink.h"
#include "components/language_detection/core/language_detection_model.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
enum class DetectLanguageError {
// 0 intentionally skipped.
// The model was not available for use.
kUnavailable = 1,
};
// Manages getting and holding a language detection model.
//
// Use this by calling `Create` and waiting for the callback to be called.
// If a model is returned, at that point it can be used to detect language.
class PLATFORM_EXPORT LanguageDetectionModel
: public GarbageCollected<LanguageDetectionModel> {
public:
using MaybeModel =
base::expected<LanguageDetectionModel*, DetectLanguageError>;
using CreateLanguageDetectionModelCallback =
base::OnceCallback<void(MaybeModel)>;
LanguageDetectionModel() = default;
// Loads the model file and passes this to `callback` when the model has been
// loaded (or we know that it will fail to load). `interface_broker` can be
// used to communicate with the browser to find the model.
void LoadModelFile(base::File model_file,
CreateLanguageDetectionModelCallback callback);
void Trace(Visitor* visitor) const;
using LanguagePrediction = language_detection::Prediction;
using DetectLanguageCallback = base::OnceCallback<void(
base::expected<WTF::Vector<LanguagePrediction>, DetectLanguageError>)>;
// Detects the language(s) used in the string using the TFLite model on the
// whole string.
//
// This is an asynchronous operation. The result will be passed to the
// `on_complete` callback.
void DetectLanguage(scoped_refptr<base::SequencedTaskRunner>& task_runner,
const WTF::String& text,
DetectLanguageCallback on_complete);
int64_t GetModelSize() const;
private:
void DetectLanguageImpl(const WTF::String& text,
DetectLanguageCallback on_complete);
// This model is shared across all execution contexts in the process.
language_detection::LanguageDetectionModel language_detection_model_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LANGUAGE_DETECTION_LANGUAGE_DETECTION_MODEL_H_
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