5e7c2e8c0d
Otherwise the global ImplCycleCollectionUnlink for JS members are shadowed by mozilla::dom::ImplCycleCollectionUnlink and can't be used. Bug 1756794 is to move all the impls to the single namespace to prevent this, but that requires verbose changes, and currently the only affected uses are from these macros. Differential Revision: https://phabricator.services.mozilla.com/D147234
89 lines
3.0 KiB
C++
89 lines
3.0 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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#include "mozilla/dom/TeeState.h"
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#include "js/Value.h"
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#include "mozilla/HoldDropJSObjects.h"
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#include "mozilla/dom/ReadableStream.h"
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#include "mozilla/dom/ReadableStreamTee.h"
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#include "mozilla/dom/Promise.h"
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namespace mozilla::dom {
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NS_IMPL_CYCLE_COLLECTION_WITH_JS_MEMBERS(TeeState,
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(mStream, mReader, mBranch1, mBranch2,
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mCancelPromise),
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(mReason1, mReason2))
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NS_IMPL_CYCLE_COLLECTING_ADDREF(TeeState)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(TeeState)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TeeState)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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TeeState::TeeState(ReadableStream* aStream, bool aCloneForBranch2)
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: mStream(aStream),
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mReason1(JS::NullValue()),
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mReason2(JS::NullValue()),
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mCloneForBranch2(aCloneForBranch2) {
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mozilla::HoldJSObjects(this);
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MOZ_RELEASE_ASSERT(!aCloneForBranch2,
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"cloneForBranch2 path is not implemented.");
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}
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already_AddRefed<TeeState> TeeState::Create(ReadableStream* aStream,
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bool aCloneForBranch2,
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ErrorResult& aRv) {
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RefPtr<TeeState> teeState = new TeeState(aStream, aCloneForBranch2);
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RefPtr<ReadableStreamDefaultReader> reader =
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AcquireReadableStreamDefaultReader(teeState->GetStream(), aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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teeState->SetReader(reader);
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RefPtr<Promise> promise =
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Promise::Create(teeState->GetStream()->GetParentObject(), aRv);
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if (aRv.Failed()) {
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return nullptr;
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}
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teeState->SetCancelPromise(promise);
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return teeState.forget();
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}
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// https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee
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// Pull Algorithm Steps:
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void TeeState::PullCallback(JSContext* aCx, nsIGlobalObject* aGlobal,
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ErrorResult& aRv) {
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// Step 13.1: If reading is true,
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if (Reading()) {
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// Step 13.1.1: Set readAgain to true.
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SetReadAgain(true);
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// Step 13.1.2: Return a promise resolved with undefined.
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// (The caller will create it if necessary)
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return;
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}
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// Step 13.2: Set reading to true.
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SetReading(true);
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// Step 13.3: Let readRequest be a read request with the following items:
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RefPtr<ReadRequest> readRequest =
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new ReadableStreamDefaultTeeReadRequest(this);
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// Step 13.4: Perform ! ReadableStreamDefaultReaderRead(reader, readRequest).
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RefPtr<ReadableStreamGenericReader> reader = GetReader();
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ReadableStreamDefaultReaderRead(aCx, reader, readRequest, aRv);
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// Step 13.5: Return a promise resolved with undefined.
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// (The caller will create it if necessary)
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}
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} // namespace mozilla::dom
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