mirror of
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119 lines
3.9 KiB
C++
119 lines
3.9 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 mozilla_dom_ReadableStreamDefaultReader_h
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#define mozilla_dom_ReadableStreamDefaultReader_h
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#include "js/TypeDecls.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/dom/ReadableStreamGenericReader.h"
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#include "mozilla/dom/ReadRequest.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsISupports.h"
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#include "nsWrapperCache.h"
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#include "mozilla/LinkedList.h"
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namespace mozilla::dom {
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class Promise;
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class ReadableStream;
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// https://streams.spec.whatwg.org/#default-reader-read
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struct Read_ReadRequest : public ReadRequest {
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(Read_ReadRequest, ReadRequest)
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RefPtr<Promise> mPromise;
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explicit Read_ReadRequest(Promise* aPromise) : mPromise(aPromise) {}
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void ChunkSteps(JSContext* aCx, JS::Handle<JS::Value> aChunk,
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ErrorResult& aRv) override;
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void CloseSteps(JSContext* aCx, ErrorResult& aRv) override;
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void ErrorSteps(JSContext* aCx, JS::Handle<JS::Value> e,
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ErrorResult& aRv) override;
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protected:
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~Read_ReadRequest() override = default;
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};
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class ReadableStreamDefaultReader final : public ReadableStreamGenericReader,
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public nsWrapperCache
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{
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS_INHERITED(
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ReadableStreamDefaultReader, ReadableStreamGenericReader)
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public:
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explicit ReadableStreamDefaultReader(nsISupports* aGlobal);
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protected:
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~ReadableStreamDefaultReader() override;
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public:
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bool IsDefault() override { return true; }
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bool IsBYOB() override { return false; }
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ReadableStreamDefaultReader* AsDefault() override { return this; }
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ReadableStreamBYOBReader* AsBYOB() override {
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MOZ_CRASH();
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return nullptr;
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}
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// Public functions to implement other specs
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// https://streams.spec.whatwg.org/#other-specs-rs-create
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// The following algorithms can be used on arbitrary ReadableStream instances,
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// including ones that are created by web developers. They can all fail in
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// various operation-specific ways, and these failures should be handled by
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// the calling specification.
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// https://streams.spec.whatwg.org/#readablestreamdefaultreader-read-a-chunk
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MOZ_CAN_RUN_SCRIPT void ReadChunk(JSContext* aCx, ReadRequest& aRequest,
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ErrorResult& aRv);
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// IDL layer functions
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JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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// IDL methods
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static already_AddRefed<ReadableStreamDefaultReader> Constructor(
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const GlobalObject& aGlobal, ReadableStream& stream, ErrorResult& aRv);
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MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> Read(ErrorResult& aRv);
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void ReleaseLock(ErrorResult& aRv);
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LinkedList<RefPtr<ReadRequest>>& ReadRequests() { return mReadRequests; }
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private:
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LinkedList<RefPtr<ReadRequest>> mReadRequests = {};
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};
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void SetUpReadableStreamDefaultReader(ReadableStreamDefaultReader* aReader,
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ReadableStream* aStream,
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ErrorResult& aRv);
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void ReadableStreamDefaultReaderErrorReadRequests(
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JSContext* aCx, ReadableStreamDefaultReader* aReader,
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JS::Handle<JS::Value> aError, ErrorResult& aRv);
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void ReadableStreamDefaultReaderRelease(JSContext* aCx,
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ReadableStreamDefaultReader* aReader,
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ErrorResult& aRv);
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} // namespace mozilla::dom
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#endif // mozilla_dom_ReadableStreamDefaultReader_h
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