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