103 lines
3.8 KiB
C++
103 lines
3.8 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 "mozilla/dom/CountQueuingStrategy.h"
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#include "mozilla/dom/FunctionBinding.h"
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#include "mozilla/dom/QueuingStrategyBinding.h"
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#include "nsCOMPtr.h"
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#include "nsISupports.h"
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namespace mozilla::dom {
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NS_IMPL_CYCLE_COLLECTION(BaseQueuingStrategy, mGlobal)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(BaseQueuingStrategy)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(BaseQueuingStrategy)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(BaseQueuingStrategy)
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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_WRAPPERCACHE_INHERITED(CountQueuingStrategy,
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BaseQueuingStrategy)
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NS_IMPL_ADDREF_INHERITED(CountQueuingStrategy, BaseQueuingStrategy)
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NS_IMPL_RELEASE_INHERITED(CountQueuingStrategy, BaseQueuingStrategy)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CountQueuingStrategy)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_END_INHERITING(BaseQueuingStrategy)
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/* static */
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already_AddRefed<CountQueuingStrategy> CountQueuingStrategy::Constructor(
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const GlobalObject& aGlobal, const QueuingStrategyInit& aInit) {
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RefPtr<CountQueuingStrategy> strategy =
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new CountQueuingStrategy(aGlobal.GetAsSupports(), aInit.mHighWaterMark);
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return strategy.forget();
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}
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nsIGlobalObject* BaseQueuingStrategy::GetParentObject() const {
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return mGlobal;
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}
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JSObject* CountQueuingStrategy::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return CountQueuingStrategy_Binding::Wrap(aCx, this, aGivenProto);
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}
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// https://streams.spec.whatwg.org/#count-queuing-strategy-size-function
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static bool CountQueuingStrategySize(JSContext* aCx, unsigned aArgc,
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JS::Value* aVp) {
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JS::CallArgs args = CallArgsFromVp(aArgc, aVp);
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// Step 1.1. Return 1.
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args.rval().setInt32(1);
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return true;
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}
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// https://streams.spec.whatwg.org/#cqs-size
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already_AddRefed<Function> CountQueuingStrategy::GetSize(ErrorResult& aRv) {
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// Step 1. Return this's relevant global object's count queuing strategy
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// size function.
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if (RefPtr<Function> fun = mGlobal->GetCountQueuingStrategySizeFunction()) {
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return fun.forget();
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}
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// Note: Instead of eagerly allocating a size function for every global object
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// we do it lazily once in this getter.
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// After this point the steps refer to:
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// https://streams.spec.whatwg.org/#count-queuing-strategy-size-function.
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AutoJSAPI jsapi;
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if (!jsapi.Init(mGlobal)) {
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aRv.ThrowUnknownError("Internal error");
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return nullptr;
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}
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JSContext* cx = jsapi.cx();
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// Step 1. Let steps be the following steps:
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// Note: See CountQueuingStrategySize instead.
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// Step 2. Let F be
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// ! CreateBuiltinFunction(steps, 0, "size", « »,
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// globalObject’s relevant Realm).
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JS::Rooted<JSFunction*> sizeFunction(
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cx, JS_NewFunction(cx, CountQueuingStrategySize, 0, 0, "size"));
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if (!sizeFunction) {
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aRv.StealExceptionFromJSContext(cx);
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return nullptr;
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}
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// Step 3. Set globalObject’s count queuing strategy size function to
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// a Function that represents a reference to F,
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// with callback context equal to globalObject’s relevant settings object.
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JS::Rooted<JSObject*> funObj(cx, JS_GetFunctionObject(sizeFunction));
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JS::Rooted<JSObject*> global(cx, mGlobal->GetGlobalJSObject());
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RefPtr<Function> function = new Function(cx, funObj, global, mGlobal);
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mGlobal->SetCountQueuingStrategySizeFunction(function);
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return function.forget();
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}
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} // namespace mozilla::dom
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