100 lines
3.7 KiB
C++
100 lines
3.7 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/ByteLengthQueuingStrategy.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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#include "js/TypeDecls.h"
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#include "js/PropertyAndElement.h"
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namespace mozilla::dom {
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_INHERITED(ByteLengthQueuingStrategy,
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BaseQueuingStrategy)
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NS_IMPL_ADDREF_INHERITED(ByteLengthQueuingStrategy, BaseQueuingStrategy)
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NS_IMPL_RELEASE_INHERITED(ByteLengthQueuingStrategy, BaseQueuingStrategy)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ByteLengthQueuingStrategy)
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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<ByteLengthQueuingStrategy>
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ByteLengthQueuingStrategy::Constructor(const GlobalObject& aGlobal,
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const QueuingStrategyInit& aInit) {
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RefPtr<ByteLengthQueuingStrategy> strategy = new ByteLengthQueuingStrategy(
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aGlobal.GetAsSupports(), aInit.mHighWaterMark);
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return strategy.forget();
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}
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JSObject* ByteLengthQueuingStrategy::WrapObject(
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JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
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return ByteLengthQueuingStrategy_Binding::Wrap(aCx, this, aGivenProto);
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}
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static bool ByteLengthQueuingStrategySize(JSContext* cx, unsigned argc,
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JS::Value* vp) {
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// https://streams.spec.whatwg.org/#blqs-internal-slots
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JS::CallArgs args = CallArgsFromVp(argc, vp);
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// Step 1: Return ? GetV(chunk, "byteLength").
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JS::Rooted<JSObject*> chunkObj(cx, JS::ToObject(cx, args.get(0)));
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if (!chunkObj) {
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return false;
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}
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return JS_GetProperty(cx, chunkObj, "byteLength", args.rval());
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}
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// https://streams.spec.whatwg.org/#blqs-size
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already_AddRefed<Function> ByteLengthQueuingStrategy::GetSize(
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ErrorResult& aRv) {
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// Step 1. Return this's relevant global object's ByteLength queuing strategy
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// size function.
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if (RefPtr<Function> fun =
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mGlobal->GetByteLengthQueuingStrategySizeFunction()) {
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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/#byte-length-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, given chunk
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// Note: See ByteLengthQueuingStrategySize instead.
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// Step 2. Let F be !CreateBuiltinFunction(steps, 1, "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, ByteLengthQueuingStrategySize, 1, 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 byte length 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->SetByteLengthQueuingStrategySizeFunction(function);
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return function.forget();
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}
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} // namespace mozilla::dom
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