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