зеркало из https://github.com/mozilla/gecko-dev.git
112 строки
4.9 KiB
C++
112 строки
4.9 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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#include "mozilla/dom/ReadableStreamDefaultController.h"
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#include "mozilla/dom/UnderlyingSourceCallbackHelpers.h"
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#include "mozilla/dom/UnderlyingSourceBinding.h"
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namespace mozilla::dom {
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// UnderlyingSourceAlgorithmsBase
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NS_IMPL_CYCLE_COLLECTION(UnderlyingSourceAlgorithmsBase)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(UnderlyingSourceAlgorithmsBase)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(UnderlyingSourceAlgorithmsBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UnderlyingSourceAlgorithmsBase)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(UnderlyingSourceAlgorithmsBase)
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTION_INHERITED_WITH_JS_MEMBERS(
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UnderlyingSourceAlgorithms, UnderlyingSourceAlgorithmsBase,
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(mGlobal, mStartCallback, mPullCallback, mCancelCallback),
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(mUnderlyingSource))
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NS_IMPL_ADDREF_INHERITED(UnderlyingSourceAlgorithms,
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UnderlyingSourceAlgorithmsBase)
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NS_IMPL_RELEASE_INHERITED(UnderlyingSourceAlgorithms,
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UnderlyingSourceAlgorithmsBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(UnderlyingSourceAlgorithms)
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NS_INTERFACE_MAP_END_INHERITING(UnderlyingSourceAlgorithmsBase)
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// https://streams.spec.whatwg.org/#set-up-readable-stream-default-controller-from-underlying-source
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void UnderlyingSourceAlgorithms::StartCallback(
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JSContext* aCx, ReadableStreamController& aController,
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JS::MutableHandle<JS::Value> aRetVal, ErrorResult& aRv) {
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if (!mStartCallback) {
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// Step 2: Let startAlgorithm be an algorithm that returns undefined.
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aRetVal.setUndefined();
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return;
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}
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// Step 5: If underlyingSourceDict["start"] exists, then set startAlgorithm to
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// an algorithm which returns the result of invoking
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// underlyingSourceDict["start"] with argument list « controller » and
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// callback this value underlyingSource.
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JS::RootedObject thisObj(aCx, mUnderlyingSource);
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ReadableStreamDefaultControllerOrReadableByteStreamController controller;
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if (aController.IsDefault()) {
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controller.SetAsReadableStreamDefaultController() = aController.AsDefault();
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} else {
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controller.SetAsReadableByteStreamController() = aController.AsByte();
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}
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return mStartCallback->Call(thisObj, controller, aRetVal, aRv,
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"UnderlyingSource.start",
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CallbackFunction::eRethrowExceptions);
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}
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// https://streams.spec.whatwg.org/#set-up-readable-stream-default-controller-from-underlying-source
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already_AddRefed<Promise> UnderlyingSourceAlgorithms::PullCallback(
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JSContext* aCx, ReadableStreamController& aController, ErrorResult& aRv) {
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JS::RootedObject thisObj(aCx, mUnderlyingSource);
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if (!mPullCallback) {
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// Step 3: Let pullAlgorithm be an algorithm that returns a promise resolved
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// with undefined.
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return Promise::CreateResolvedWithUndefined(mGlobal, aRv);
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}
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// Step 6: If underlyingSourceDict["pull"] exists, then set pullAlgorithm to
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// an algorithm which returns the result of invoking
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// underlyingSourceDict["pull"] with argument list « controller » and callback
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// this value underlyingSource.
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ReadableStreamDefaultControllerOrReadableByteStreamController controller;
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if (aController.IsDefault()) {
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controller.SetAsReadableStreamDefaultController() = aController.AsDefault();
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} else {
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controller.SetAsReadableByteStreamController() = aController.AsByte();
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}
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RefPtr<Promise> promise =
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mPullCallback->Call(thisObj, controller, aRv, "UnderlyingSource.pull",
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CallbackFunction::eRethrowExceptions);
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return promise.forget();
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}
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// https://streams.spec.whatwg.org/#set-up-readable-stream-default-controller-from-underlying-source
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already_AddRefed<Promise> UnderlyingSourceAlgorithms::CancelCallback(
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JSContext* aCx, const Optional<JS::Handle<JS::Value>>& aReason,
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ErrorResult& aRv) {
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if (!mCancelCallback) {
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// Step 4: Let cancelAlgorithm be an algorithm that returns a promise
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// resolved with undefined.
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return Promise::CreateResolvedWithUndefined(mGlobal, aRv);
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}
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// Step 7: If underlyingSourceDict["cancel"] exists, then set cancelAlgorithm
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// to an algorithm which takes an argument reason and returns the result of
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// invoking underlyingSourceDict["cancel"] with argument list « reason » and
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// callback this value underlyingSource.
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JS::RootedObject thisObj(aCx, mUnderlyingSource);
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RefPtr<Promise> promise =
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mCancelCallback->Call(thisObj, aReason, aRv, "UnderlyingSource.cancel",
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CallbackFunction::eRethrowExceptions);
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return promise.forget();
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}
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} // namespace mozilla::dom
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