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-rw-r--r--dom/streams/TeeState.cpp87
1 files changed, 87 insertions, 0 deletions
diff --git a/dom/streams/TeeState.cpp b/dom/streams/TeeState.cpp
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+++ b/dom/streams/TeeState.cpp
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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/. */
+
+#include "TeeState.h"
+
+#include "ReadableStreamTee.h"
+#include "js/Value.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/dom/ReadableStream.h"
+#include "mozilla/dom/Promise.h"
+
+namespace mozilla::dom {
+
+using namespace streams_abstract;
+
+NS_IMPL_CYCLE_COLLECTION_WITH_JS_MEMBERS(TeeState,
+ (mStream, mReader, mBranch1, mBranch2,
+ mCancelPromise),
+ (mReason1, mReason2))
+NS_IMPL_CYCLE_COLLECTING_ADDREF(TeeState)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(TeeState)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TeeState)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+TeeState::TeeState(ReadableStream* aStream, bool aCloneForBranch2)
+ : mStream(aStream),
+ mReason1(JS::NullValue()),
+ mReason2(JS::NullValue()),
+ mCloneForBranch2(aCloneForBranch2) {
+ mozilla::HoldJSObjects(this);
+ MOZ_RELEASE_ASSERT(!aCloneForBranch2,
+ "cloneForBranch2 path is not implemented.");
+}
+
+already_AddRefed<TeeState> TeeState::Create(ReadableStream* aStream,
+ bool aCloneForBranch2,
+ ErrorResult& aRv) {
+ RefPtr<TeeState> teeState = new TeeState(aStream, aCloneForBranch2);
+
+ RefPtr<ReadableStreamDefaultReader> reader =
+ AcquireReadableStreamDefaultReader(teeState->GetStream(), aRv);
+ if (aRv.Failed()) {
+ return nullptr;
+ }
+ teeState->SetReader(reader);
+
+ RefPtr<Promise> promise =
+ Promise::CreateInfallible(teeState->GetStream()->GetParentObject());
+ teeState->SetCancelPromise(promise);
+
+ return teeState.forget();
+}
+
+// https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee
+// Pull Algorithm Steps:
+void TeeState::PullCallback(JSContext* aCx, nsIGlobalObject* aGlobal,
+ ErrorResult& aRv) {
+ // Step 13.1: If reading is true,
+ if (Reading()) {
+ // Step 13.1.1: Set readAgain to true.
+ SetReadAgain(true);
+
+ // Step 13.1.2: Return a promise resolved with undefined.
+ // (The caller will create it if necessary)
+ return;
+ }
+
+ // Step 13.2: Set reading to true.
+ SetReading(true);
+
+ // Step 13.3: Let readRequest be a read request with the following items:
+ RefPtr<ReadRequest> readRequest =
+ new ReadableStreamDefaultTeeReadRequest(this);
+
+ // Step 13.4: Perform ! ReadableStreamDefaultReaderRead(reader, readRequest).
+ RefPtr<ReadableStreamGenericReader> reader = GetReader();
+ ReadableStreamDefaultReaderRead(aCx, reader, readRequest, aRv);
+
+ // Step 13.5: Return a promise resolved with undefined.
+ // (The caller will create it if necessary)
+}
+
+} // namespace mozilla::dom