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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_STREAMS_TRANSFORMERCALLBACKHELPERS_H_
#define DOM_STREAMS_TRANSFORMERCALLBACKHELPERS_H_
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/dom/TransformerBinding.h"
#include "nsCycleCollectionParticipant.h"
namespace mozilla::dom {
class Promise;
class TransformerAlgorithmsBase : public nsISupports {
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(TransformerAlgorithmsBase)
MOZ_CAN_RUN_SCRIPT virtual already_AddRefed<Promise> TransformCallback(
JSContext* aCx, JS::Handle<JS::Value> aChunk,
TransformStreamDefaultController& aController, ErrorResult& aRv) = 0;
MOZ_CAN_RUN_SCRIPT virtual already_AddRefed<Promise> FlushCallback(
JSContext* aCx, TransformStreamDefaultController& aController,
ErrorResult& aRv) = 0;
protected:
virtual ~TransformerAlgorithmsBase() = default;
};
// https://streams.spec.whatwg.org/#set-up-transform-stream-default-controller-from-transformer
class TransformerAlgorithms final : public TransformerAlgorithmsBase {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(
TransformerAlgorithms, TransformerAlgorithmsBase)
TransformerAlgorithms(nsIGlobalObject* aGlobal,
JS::Handle<JSObject*> aTransformer,
Transformer& aTransformerDict)
: mGlobal(aGlobal), mTransformer(aTransformer) {
// Step 4. (Step 2 is implicitly done through the initialization of
// mTransformCallback to null)
if (aTransformerDict.mTransform.WasPassed()) {
mTransformCallback = aTransformerDict.mTransform.Value();
}
// Step 5. (Step 3 is implicitly done through the initialization of
// mTransformCallback to null)
if (aTransformerDict.mFlush.WasPassed()) {
mFlushCallback = aTransformerDict.mFlush.Value();
}
mozilla::HoldJSObjects(this);
};
MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> TransformCallback(
JSContext* aCx, JS::Handle<JS::Value> aChunk,
TransformStreamDefaultController& aController, ErrorResult& aRv) override;
MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> FlushCallback(
JSContext* aCx, TransformStreamDefaultController& aController,
ErrorResult& aRv) override;
protected:
~TransformerAlgorithms() { mozilla::DropJSObjects(this); }
private:
// Virtually const, but are cycle collected
nsCOMPtr<nsIGlobalObject> mGlobal;
JS::Heap<JSObject*> mTransformer;
MOZ_KNOWN_LIVE RefPtr<TransformerTransformCallback> mTransformCallback;
MOZ_KNOWN_LIVE RefPtr<TransformerFlushCallback> mFlushCallback;
};
// https://streams.spec.whatwg.org/#transformstream-set-up
class TransformerAlgorithmsWrapper : public TransformerAlgorithmsBase {
MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> TransformCallback(
JSContext*, JS::Handle<JS::Value> aChunk,
TransformStreamDefaultController& aController, ErrorResult& aRv) final;
MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> FlushCallback(
JSContext*, TransformStreamDefaultController& aController,
ErrorResult& aRv) final;
MOZ_CAN_RUN_SCRIPT virtual void TransformCallbackImpl(
JS::Handle<JS::Value> aChunk,
TransformStreamDefaultController& aController, ErrorResult& aRv) = 0;
MOZ_CAN_RUN_SCRIPT virtual void FlushCallbackImpl(
TransformStreamDefaultController& aController, ErrorResult& aRv) {
// flushAlgorithm is optional, do nothing by default
}
};
} // namespace mozilla::dom
#endif // DOM_STREAMS_TRANSFORMERCALLBACKHELPERS_H_
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