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112 lines
4.8 KiB
C++
112 lines
4.8 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 "TransformerCallbackHelpers.h"
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#include "StreamUtils.h"
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#include "mozilla/dom/Promise.h"
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#include "mozilla/dom/TransformStreamDefaultController.h"
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using namespace mozilla::dom;
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NS_IMPL_CYCLE_COLLECTION(TransformerAlgorithmsBase)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(TransformerAlgorithmsBase)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(TransformerAlgorithmsBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TransformerAlgorithmsBase)
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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_INHERITED_WITH_JS_MEMBERS(
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TransformerAlgorithms, TransformerAlgorithmsBase,
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(mGlobal, mTransformCallback, mFlushCallback), (mTransformer))
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NS_IMPL_ADDREF_INHERITED(TransformerAlgorithms, TransformerAlgorithmsBase)
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NS_IMPL_RELEASE_INHERITED(TransformerAlgorithms, TransformerAlgorithmsBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TransformerAlgorithms)
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NS_INTERFACE_MAP_END_INHERITING(TransformerAlgorithmsBase)
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// https://streams.spec.whatwg.org/#set-up-transform-stream-default-controller-from-transformer
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already_AddRefed<Promise> TransformerAlgorithms::TransformCallback(
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JSContext* aCx, JS::Handle<JS::Value> aChunk,
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TransformStreamDefaultController& aController, ErrorResult& aRv) {
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if (!mTransformCallback) {
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// Step 2.1. Let result be
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// TransformStreamDefaultControllerEnqueue(controller, chunk).
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aController.Enqueue(aCx, aChunk, aRv);
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// Step 2.2. If result is an abrupt completion, return a promise rejected
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// with result.[[Value]].
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if (aRv.MaybeSetPendingException(aCx)) {
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JS::Rooted<JS::Value> error(aCx);
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if (!JS_GetPendingException(aCx, &error)) {
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// Uncatchable exception; we should mark aRv and return.
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aRv.StealExceptionFromJSContext(aCx);
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return nullptr;
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}
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JS_ClearPendingException(aCx);
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return Promise::CreateRejected(aController.GetParentObject(), error, aRv);
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}
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// Step 2.3. Otherwise, return a promise resolved with undefined.
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return Promise::CreateResolvedWithUndefined(aController.GetParentObject(),
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aRv);
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}
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// Step 4. If transformerDict["transform"] exists, set transformAlgorithm to
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// an algorithm which takes an argument chunk and returns the result of
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// invoking transformerDict["transform"] with argument list « chunk,
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// controller » and callback this value transformer.
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JS::Rooted<JSObject*> thisObj(aCx, mTransformer);
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return MOZ_KnownLive(mTransformCallback)
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->Call(thisObj, aChunk, aController, aRv,
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"TransformStreamDefaultController.[[transformAlgorithm]]",
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CallbackObject::eRethrowExceptions);
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}
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// https://streams.spec.whatwg.org/#set-up-transform-stream-default-controller-from-transformer
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already_AddRefed<Promise> TransformerAlgorithms::FlushCallback(
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JSContext* aCx, TransformStreamDefaultController& aController,
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ErrorResult& aRv) {
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if (!mFlushCallback) {
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// Step 3. Let flushAlgorithm be an algorithm which returns a promise
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// resolved with undefined.
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return Promise::CreateResolvedWithUndefined(aController.GetParentObject(),
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aRv);
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}
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// Step 5. If transformerDict["flush"] exists, set flushAlgorithm to an
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// algorithm which returns the result of invoking transformerDict["flush"]
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// with argument list « controller » and callback this value transformer.
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JS::Rooted<JSObject*> thisObj(aCx, mTransformer);
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return MOZ_KnownLive(mFlushCallback)
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->Call(thisObj, aController, aRv,
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"TransformStreamDefaultController.[[flushAlgorithm]]",
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CallbackObject::eRethrowExceptions);
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}
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already_AddRefed<Promise> TransformerAlgorithmsWrapper::TransformCallback(
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JSContext*, JS::Handle<JS::Value> aChunk,
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TransformStreamDefaultController& aController, ErrorResult& aRv) {
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nsCOMPtr<nsIGlobalObject> global = aController.GetParentObject();
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return PromisifyAlgorithm(
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global,
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[this, &aChunk, &aController](ErrorResult& aRv)
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MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
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return TransformCallbackImpl(aChunk, aController, aRv);
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},
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aRv);
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}
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already_AddRefed<Promise> TransformerAlgorithmsWrapper::FlushCallback(
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JSContext*, TransformStreamDefaultController& aController,
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ErrorResult& aRv) {
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nsCOMPtr<nsIGlobalObject> global = aController.GetParentObject();
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return PromisifyAlgorithm(
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global,
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[this, &aController](ErrorResult& aRv) MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
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return FlushCallbackImpl(aController, aRv);
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},
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aRv);
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}
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