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