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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_TeeState_h
#define mozilla_dom_TeeState_h
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/ReadableStreamDefaultReader.h"
#include "nsISupports.h"
namespace mozilla::dom {
class ReadableStreamDefaultTeeSourceAlgorithms;
enum class TeeBranch : bool {
Branch1,
Branch2,
};
inline TeeBranch OtherTeeBranch(TeeBranch aBranch) {
if (aBranch == TeeBranch::Branch1) {
return TeeBranch::Branch2;
}
return TeeBranch::Branch1;
}
// A closure capturing the free variables in the ReadableStreamTee family of
// algorithms.
// https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee
// https://streams.spec.whatwg.org/#abstract-opdef-readablebytestreamtee
struct TeeState : public nsISupports {
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(TeeState)
static already_AddRefed<TeeState> Create(ReadableStream* aStream,
bool aCloneForBranch2,
ErrorResult& aRv);
ReadableStream* GetStream() const { return mStream; }
void SetStream(ReadableStream* aStream) { mStream = aStream; }
ReadableStreamGenericReader* GetReader() const { return mReader; }
void SetReader(ReadableStreamGenericReader* aReader) { mReader = aReader; }
ReadableStreamDefaultReader* GetDefaultReader() const {
return mReader->AsDefault();
}
bool ReadAgain() const { return mReadAgain; }
void SetReadAgain(bool aReadAgain) { mReadAgain = aReadAgain; }
// ReadableByteStreamTee uses ReadAgainForBranch{1,2};
bool ReadAgainForBranch1() const { return ReadAgain(); }
void SetReadAgainForBranch1(bool aReadAgainForBranch1) {
SetReadAgain(aReadAgainForBranch1);
}
bool ReadAgainForBranch2() const { return mReadAgainForBranch2; }
void SetReadAgainForBranch2(bool aReadAgainForBranch2) {
mReadAgainForBranch2 = aReadAgainForBranch2;
}
bool Reading() const { return mReading; }
void SetReading(bool aReading) { mReading = aReading; }
bool Canceled1() const { return mCanceled1; }
void SetCanceled1(bool aCanceled1) { mCanceled1 = aCanceled1; }
bool Canceled2() const { return mCanceled2; }
void SetCanceled2(bool aCanceled2) { mCanceled2 = aCanceled2; }
void SetCanceled(TeeBranch aBranch, bool aCanceled) {
aBranch == TeeBranch::Branch1 ? SetCanceled1(aCanceled)
: SetCanceled2(aCanceled);
}
bool Canceled(TeeBranch aBranch) {
return aBranch == TeeBranch::Branch1 ? Canceled1() : Canceled2();
}
JS::Value Reason1() const { return mReason1; }
void SetReason1(JS::Handle<JS::Value> aReason1) { mReason1 = aReason1; }
JS::Value Reason2() const { return mReason2; }
void SetReason2(JS::Handle<JS::Value> aReason2) { mReason2 = aReason2; }
void SetReason(TeeBranch aBranch, JS::Handle<JS::Value> aReason) {
aBranch == TeeBranch::Branch1 ? SetReason1(aReason) : SetReason2(aReason);
}
ReadableStream* Branch1() const { return mBranch1; }
void SetBranch1(already_AddRefed<ReadableStream> aBranch1) {
mBranch1 = aBranch1;
}
ReadableStream* Branch2() const { return mBranch2; }
void SetBranch2(already_AddRefed<ReadableStream> aBranch2) {
mBranch2 = aBranch2;
}
Promise* CancelPromise() const { return mCancelPromise; }
void SetCancelPromise(Promise* aCancelPromise) {
mCancelPromise = aCancelPromise;
}
bool CloneForBranch2() const { return mCloneForBranch2; }
void setCloneForBranch2(bool aCloneForBranch2) {
mCloneForBranch2 = aCloneForBranch2;
}
// Some code is better served by using an enum into various internal slots to
// avoid duplication: Here we provide alternative accessors for that case.
ReadableStream* Branch(TeeBranch aBranch) const {
return aBranch == TeeBranch::Branch1 ? Branch1() : Branch2();
}
void SetReadAgainForBranch(TeeBranch aBranch, bool aValue) {
if (aBranch == TeeBranch::Branch1) {
SetReadAgainForBranch1(aValue);
return;
}
SetReadAgainForBranch2(aValue);
}
MOZ_CAN_RUN_SCRIPT void PullCallback(JSContext* aCx, nsIGlobalObject* aGlobal,
ErrorResult& aRv);
private:
TeeState(ReadableStream* aStream, bool aCloneForBranch2);
// Implicit:
RefPtr<ReadableStream> mStream;
// Step 3. (Step Numbering is based on ReadableStreamDefaultTee)
RefPtr<ReadableStreamGenericReader> mReader;
// Step 4.
bool mReading = false;
// Step 5.
// (Aliased to readAgainForBranch1, for the purpose of ReadableByteStreamTee)
bool mReadAgain = false;
// ReadableByteStreamTee
bool mReadAgainForBranch2 = false;
// Step 6.
bool mCanceled1 = false;
// Step 7.
bool mCanceled2 = false;
// Step 8.
JS::Heap<JS::Value> mReason1;
// Step 9.
JS::Heap<JS::Value> mReason2;
// Step 10.
RefPtr<ReadableStream> mBranch1;
// Step 11.
RefPtr<ReadableStream> mBranch2;
// Step 12.
RefPtr<Promise> mCancelPromise;
// Implicit:
bool mCloneForBranch2 = false;
virtual ~TeeState() { mozilla::DropJSObjects(this); }
};
} // namespace mozilla::dom
#endif
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