Quelle TransformerCallbackHelpers.cpp Sprache: C

/* -*- 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);
}

quality100%

¤ Dauer der Verarbeitung: 0.31 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.