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