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gecko-dev/dom/base/CustomElementRegistry.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/CustomElementRegistry.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/dom/CustomElementRegistryBinding.h"
#include "mozilla/dom/HTMLElementBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WebComponentsBinding.h"
#include "mozilla/dom/DocGroup.h"
#include "nsHTMLTags.h"
#include "jsapi.h"
#include "nsGlobalWindow.h"
namespace mozilla {
namespace dom {
//-----------------------------------------------------
// CustomElementUpgradeReaction
class CustomElementUpgradeReaction final : public CustomElementReaction
{
public:
explicit CustomElementUpgradeReaction(CustomElementDefinition* aDefinition)
: mDefinition(aDefinition)
{
mIsUpgradeReaction = true;
}
virtual void Traverse(nsCycleCollectionTraversalCallback& aCb) const override
{
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mDefinition");
aCb.NoteNativeChild(mDefinition,
NS_CYCLE_COLLECTION_PARTICIPANT(CustomElementDefinition));
}
private:
virtual void Invoke(Element* aElement, ErrorResult& aRv) override
{
CustomElementRegistry::Upgrade(aElement, mDefinition, aRv);
}
RefPtr<CustomElementDefinition> mDefinition;
};
//-----------------------------------------------------
// CustomElementCallbackReaction
class CustomElementCallbackReaction final : public CustomElementReaction
{
public:
explicit CustomElementCallbackReaction(UniquePtr<CustomElementCallback> aCustomElementCallback)
: mCustomElementCallback(std::move(aCustomElementCallback))
{
}
virtual void Traverse(nsCycleCollectionTraversalCallback& aCb) const override
{
mCustomElementCallback->Traverse(aCb);
}
private:
virtual void Invoke(Element* aElement, ErrorResult& aRv) override
{
mCustomElementCallback->Call();
}
UniquePtr<CustomElementCallback> mCustomElementCallback;
};
//-----------------------------------------------------
// CustomElementCallback
void
CustomElementCallback::Call()
{
switch (mType) {
case nsIDocument::eConnected:
static_cast<LifecycleConnectedCallback *>(mCallback.get())->Call(mThisObject);
break;
case nsIDocument::eDisconnected:
static_cast<LifecycleDisconnectedCallback *>(mCallback.get())->Call(mThisObject);
break;
case nsIDocument::eAdopted:
static_cast<LifecycleAdoptedCallback *>(mCallback.get())->Call(mThisObject,
mAdoptedCallbackArgs.mOldDocument, mAdoptedCallbackArgs.mNewDocument);
break;
case nsIDocument::eAttributeChanged:
static_cast<LifecycleAttributeChangedCallback *>(mCallback.get())->Call(mThisObject,
mArgs.name, mArgs.oldValue, mArgs.newValue, mArgs.namespaceURI);
break;
}
}
void
CustomElementCallback::Traverse(nsCycleCollectionTraversalCallback& aCb) const
{
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mThisObject");
aCb.NoteXPCOMChild(mThisObject);
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mCallback");
aCb.NoteXPCOMChild(mCallback);
}
CustomElementCallback::CustomElementCallback(Element* aThisObject,
nsIDocument::ElementCallbackType aCallbackType,
mozilla::dom::CallbackFunction* aCallback)
: mThisObject(aThisObject),
mCallback(aCallback),
mType(aCallbackType)
{
}
//-----------------------------------------------------
// CustomElementConstructor
already_AddRefed<Element>
CustomElementConstructor::Construct(const char* aExecutionReason,
ErrorResult& aRv)
{
CallSetup s(this, aRv, aExecutionReason,
CallbackFunction::eRethrowExceptions);
JSContext* cx = s.GetContext();
if (!cx) {
MOZ_ASSERT(aRv.Failed());
return nullptr;
}
JS::Rooted<JSObject*> result(cx);
JS::Rooted<JS::Value> constructor(cx, JS::ObjectValue(*mCallback));
if (!JS::Construct(cx, constructor, JS::HandleValueArray::empty(), &result)) {
aRv.NoteJSContextException(cx);
return nullptr;
}
RefPtr<Element> element;
if (NS_FAILED(UNWRAP_OBJECT(Element, &result, element))) {
return nullptr;
}
return element.forget();
}
//-----------------------------------------------------
// CustomElementData
CustomElementData::CustomElementData(nsAtom* aType)
: CustomElementData(aType, CustomElementData::State::eUndefined)
{
}
CustomElementData::CustomElementData(nsAtom* aType, State aState)
: mState(aState)
, mType(aType)
{
}
void
CustomElementData::SetCustomElementDefinition(CustomElementDefinition* aDefinition)
{
MOZ_ASSERT(mState == State::eCustom);
MOZ_ASSERT(!mCustomElementDefinition);
MOZ_ASSERT(aDefinition->mType == mType);
mCustomElementDefinition = aDefinition;
}
CustomElementDefinition*
CustomElementData::GetCustomElementDefinition()
{
MOZ_ASSERT(mCustomElementDefinition ? mState == State::eCustom
: mState != State::eCustom);
return mCustomElementDefinition;
}
nsAtom*
CustomElementData::GetCustomElementType()
{
return mType;
}
void
CustomElementData::Traverse(nsCycleCollectionTraversalCallback& aCb) const
{
for (uint32_t i = 0; i < mReactionQueue.Length(); i++) {
if (mReactionQueue[i]) {
mReactionQueue[i]->Traverse(aCb);
}
}
if (mCustomElementDefinition) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(aCb, "mCustomElementDefinition");
aCb.NoteNativeChild(mCustomElementDefinition,
NS_CYCLE_COLLECTION_PARTICIPANT(CustomElementDefinition));
}
}
void
CustomElementData::Unlink()
{
mReactionQueue.Clear();
mCustomElementDefinition = nullptr;
}
//-----------------------------------------------------
// CustomElementRegistry
namespace {
class MOZ_RAII AutoConstructionStackEntry final
{
public:
AutoConstructionStackEntry(nsTArray<RefPtr<Element>>& aStack,
Element* aElement)
: mStack(aStack)
{
MOZ_ASSERT(aElement->IsHTMLElement() || aElement->IsXULElement());
mIndex = mStack.Length();
mStack.AppendElement(aElement);
}
~AutoConstructionStackEntry()
{
MOZ_ASSERT(mIndex == mStack.Length() - 1,
"Removed element should be the last element");
mStack.RemoveElementAt(mIndex);
}
private:
nsTArray<RefPtr<Element>>& mStack;
uint32_t mIndex;
};
} // namespace anonymous
// Only needed for refcounted objects.
NS_IMPL_CYCLE_COLLECTION_CLASS(CustomElementRegistry)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CustomElementRegistry)
tmp->mConstructors.clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCustomDefinitions)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mWhenDefinedPromiseMap)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mElementCreationCallbacks)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mWindow)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CustomElementRegistry)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCustomDefinitions)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWhenDefinedPromiseMap)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElementCreationCallbacks)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(CustomElementRegistry)
for (ConstructorMap::Enum iter(tmp->mConstructors); !iter.empty(); iter.popFront()) {
aCallbacks.Trace(&iter.front().mutableKey(),
"mConstructors key",
aClosure);
}
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(CustomElementRegistry)
NS_IMPL_CYCLE_COLLECTING_RELEASE(CustomElementRegistry)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CustomElementRegistry)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
CustomElementRegistry::CustomElementRegistry(nsPIDOMWindowInner* aWindow)
: mWindow(aWindow)
, mIsCustomDefinitionRunning(false)
{
MOZ_ASSERT(aWindow);
MOZ_ALWAYS_TRUE(mConstructors.init());
mozilla::HoldJSObjects(this);
}
CustomElementRegistry::~CustomElementRegistry()
{
mozilla::DropJSObjects(this);
}
bool
CustomElementRegistry::IsCustomElementEnabled(JSContext* aCx, JSObject* aObject)
{
if (nsContentUtils::IsCustomElementsEnabled()) {
return true;
}
return XRE_IsParentProcess() && nsContentUtils::AllowXULXBLForPrincipal(nsContentUtils::ObjectPrincipal(aObject));
}
bool
CustomElementRegistry::IsCustomElementEnabled(nsIDocument* aDoc)
{
if (nsContentUtils::IsCustomElementsEnabled()) {
return true;
}
return XRE_IsParentProcess() && aDoc->AllowXULXBL();
}
NS_IMETHODIMP
CustomElementRegistry::RunCustomElementCreationCallback::Run()
{
ErrorResult er;
nsDependentAtomString value(mAtom);
mCallback->Call(value, er);
MOZ_ASSERT(NS_SUCCEEDED(er.StealNSResult()),
"chrome JavaScript error in the callback.");
CustomElementDefinition* definition =
mRegistry->mCustomDefinitions.GetWeak(mAtom);
MOZ_ASSERT(definition, "Callback should define the definition of type.");
MOZ_ASSERT(!mRegistry->mElementCreationCallbacks.GetWeak(mAtom),
"Callback should be removed.");
nsAutoPtr<nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>> elements;
mRegistry->mElementCreationCallbacksUpgradeCandidatesMap.Remove(mAtom, &elements);
MOZ_ASSERT(elements, "There should be a list");
for (auto iter = elements->Iter(); !iter.Done(); iter.Next()) {
nsCOMPtr<Element> elem = do_QueryReferent(iter.Get()->GetKey());
if (!elem) {
continue;
}
CustomElementRegistry::Upgrade(elem, definition, er);
MOZ_ASSERT(NS_SUCCEEDED(er.StealNSResult()),
"chrome JavaScript error in custom element construction.");
}
return NS_OK;
}
CustomElementDefinition*
CustomElementRegistry::LookupCustomElementDefinition(nsAtom* aNameAtom,
nsAtom* aTypeAtom)
{
CustomElementDefinition* data = mCustomDefinitions.GetWeak(aTypeAtom);
if (!data) {
RefPtr<CustomElementCreationCallback> callback;
mElementCreationCallbacks.Get(aTypeAtom, getter_AddRefs(callback));
if (callback) {
mElementCreationCallbacks.Remove(aTypeAtom);
mElementCreationCallbacksUpgradeCandidatesMap.LookupOrAdd(aTypeAtom);
RefPtr<Runnable> runnable =
new RunCustomElementCreationCallback(this, aTypeAtom, callback);
nsContentUtils::AddScriptRunner(runnable);
data = mCustomDefinitions.GetWeak(aTypeAtom);
}
}
if (data && data->mLocalName == aNameAtom) {
return data;
}
return nullptr;
}
CustomElementDefinition*
CustomElementRegistry::LookupCustomElementDefinition(JSContext* aCx,
JSObject* aConstructor) const
{
JS::Rooted<JSObject*> constructor(aCx, js::CheckedUnwrap(aConstructor));
const auto& ptr = mConstructors.lookup(constructor);
if (!ptr) {
return nullptr;
}
CustomElementDefinition* definition = mCustomDefinitions.GetWeak(ptr->value());
MOZ_ASSERT(definition, "Definition must be found in mCustomDefinitions");
return definition;
}
void
CustomElementRegistry::RegisterUnresolvedElement(Element* aElement, nsAtom* aTypeName)
{
// We don't have a use-case for a Custom Element inside NAC, and continuing
// here causes performance issues for NAC + XBL anonymous content.
if (aElement->IsInNativeAnonymousSubtree()) {
return;
}
mozilla::dom::NodeInfo* info = aElement->NodeInfo();
// Candidate may be a custom element through extension,
// in which case the custom element type name will not
// match the element tag name. e.g. <button is="x-button">.
RefPtr<nsAtom> typeName = aTypeName;
if (!typeName) {
typeName = info->NameAtom();
}
if (mCustomDefinitions.GetWeak(typeName)) {
return;
}
nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>* unresolved =
mCandidatesMap.LookupOrAdd(typeName);
nsWeakPtr elem = do_GetWeakReference(aElement);
unresolved->PutEntry(elem);
}
void
CustomElementRegistry::UnregisterUnresolvedElement(Element* aElement,
nsAtom* aTypeName)
{
nsIWeakReference* weak = aElement->GetExistingWeakReference();
if (!weak) {
return;
}
#ifdef DEBUG
{
nsWeakPtr weakPtr = do_GetWeakReference(aElement);
MOZ_ASSERT(weak == weakPtr.get(),
"do_GetWeakReference should reuse the existing nsIWeakReference.");
}
#endif
nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>* candidates = nullptr;
if (mCandidatesMap.Get(aTypeName, &candidates)) {
MOZ_ASSERT(candidates);
candidates->RemoveEntry(weak);
}
}
/* static */ UniquePtr<CustomElementCallback>
CustomElementRegistry::CreateCustomElementCallback(
nsIDocument::ElementCallbackType aType, Element* aCustomElement,
LifecycleCallbackArgs* aArgs,
LifecycleAdoptedCallbackArgs* aAdoptedCallbackArgs,
CustomElementDefinition* aDefinition)
{
MOZ_ASSERT(aDefinition, "CustomElementDefinition should not be null");
MOZ_ASSERT(aCustomElement->GetCustomElementData(),
"CustomElementData should exist");
// Let CALLBACK be the callback associated with the key NAME in CALLBACKS.
CallbackFunction* func = nullptr;
switch (aType) {
case nsIDocument::eConnected:
if (aDefinition->mCallbacks->mConnectedCallback.WasPassed()) {
func = aDefinition->mCallbacks->mConnectedCallback.Value();
}
break;
case nsIDocument::eDisconnected:
if (aDefinition->mCallbacks->mDisconnectedCallback.WasPassed()) {
func = aDefinition->mCallbacks->mDisconnectedCallback.Value();
}
break;
case nsIDocument::eAdopted:
if (aDefinition->mCallbacks->mAdoptedCallback.WasPassed()) {
func = aDefinition->mCallbacks->mAdoptedCallback.Value();
}
break;
case nsIDocument::eAttributeChanged:
if (aDefinition->mCallbacks->mAttributeChangedCallback.WasPassed()) {
func = aDefinition->mCallbacks->mAttributeChangedCallback.Value();
}
break;
}
// If there is no such callback, stop.
if (!func) {
return nullptr;
}
// Add CALLBACK to ELEMENT's callback queue.
auto callback =
MakeUnique<CustomElementCallback>(aCustomElement, aType, func);
if (aArgs) {
callback->SetArgs(*aArgs);
}
if (aAdoptedCallbackArgs) {
callback->SetAdoptedCallbackArgs(*aAdoptedCallbackArgs);
}
return callback;
}
/* static */ void
CustomElementRegistry::EnqueueLifecycleCallback(nsIDocument::ElementCallbackType aType,
Element* aCustomElement,
LifecycleCallbackArgs* aArgs,
LifecycleAdoptedCallbackArgs* aAdoptedCallbackArgs,
CustomElementDefinition* aDefinition)
{
CustomElementDefinition* definition = aDefinition;
if (!definition) {
definition = aCustomElement->GetCustomElementDefinition();
if (!definition ||
definition->mLocalName != aCustomElement->NodeInfo()->NameAtom()) {
return;
}
if (!definition->mCallbacks) {
// definition has been unlinked. Don't try to mess with it.
return;
}
}
auto callback =
CreateCustomElementCallback(aType, aCustomElement, aArgs,
aAdoptedCallbackArgs, definition);
if (!callback) {
return;
}
DocGroup* docGroup = aCustomElement->OwnerDoc()->GetDocGroup();
if (!docGroup) {
return;
}
if (aType == nsIDocument::eAttributeChanged) {
RefPtr<nsAtom> attrName = NS_Atomize(aArgs->name);
if (definition->mObservedAttributes.IsEmpty() ||
!definition->mObservedAttributes.Contains(attrName)) {
return;
}
}
CustomElementReactionsStack* reactionsStack =
docGroup->CustomElementReactionsStack();
reactionsStack->EnqueueCallbackReaction(aCustomElement, std::move(callback));
}
namespace {
class CandidateFinder
{
public:
CandidateFinder(nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>& aCandidates,
nsIDocument* aDoc);
nsTArray<nsCOMPtr<Element>> OrderedCandidates();
private:
bool Traverse(Element* aRoot, nsTArray<nsCOMPtr<Element>>& aOrderedElements);
nsCOMPtr<nsIDocument> mDoc;
nsInterfaceHashtable<nsPtrHashKey<Element>, Element> mCandidates;
};
CandidateFinder::CandidateFinder(nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>& aCandidates,
nsIDocument* aDoc)
: mDoc(aDoc)
, mCandidates(aCandidates.Count())
{
MOZ_ASSERT(mDoc);
for (auto iter = aCandidates.Iter(); !iter.Done(); iter.Next()) {
nsCOMPtr<Element> elem = do_QueryReferent(iter.Get()->GetKey());
if (!elem) {
continue;
}
Element* key = elem.get();
mCandidates.Put(key, elem.forget());
}
}
nsTArray<nsCOMPtr<Element>>
CandidateFinder::OrderedCandidates()
{
if (mCandidates.Count() == 1) {
// Fast path for one candidate.
for (auto iter = mCandidates.Iter(); !iter.Done(); iter.Next()) {
nsTArray<nsCOMPtr<Element>> rval({ std::move(iter.Data()) });
iter.Remove();
return rval;
}
}
nsTArray<nsCOMPtr<Element>> orderedElements(mCandidates.Count());
for (Element* child = mDoc->GetFirstElementChild(); child; child = child->GetNextElementSibling()) {
if (!Traverse(child, orderedElements)) {
break;
}
}
return orderedElements;
}
bool
CandidateFinder::Traverse(Element* aRoot, nsTArray<nsCOMPtr<Element>>& aOrderedElements)
{
nsCOMPtr<Element> elem;
if (mCandidates.Remove(aRoot, getter_AddRefs(elem))) {
aOrderedElements.AppendElement(std::move(elem));
if (mCandidates.Count() == 0) {
return false;
}
}
if (ShadowRoot* root = aRoot->GetShadowRoot()) {
// First iterate the children of the shadow root if aRoot is a shadow host.
for (Element* child = root->GetFirstElementChild(); child;
child = child->GetNextElementSibling()) {
if (!Traverse(child, aOrderedElements)) {
return false;
}
}
}
// Iterate the explicit children of aRoot.
for (Element* child = aRoot->GetFirstElementChild(); child;
child = child->GetNextElementSibling()) {
if (!Traverse(child, aOrderedElements)) {
return false;
}
}
return true;
}
}
void
CustomElementRegistry::UpgradeCandidates(nsAtom* aKey,
CustomElementDefinition* aDefinition,
ErrorResult& aRv)
{
DocGroup* docGroup = mWindow->GetDocGroup();
if (!docGroup) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return;
}
nsAutoPtr<nsTHashtable<nsRefPtrHashKey<nsIWeakReference>>> candidates;
if (mCandidatesMap.Remove(aKey, &candidates)) {
MOZ_ASSERT(candidates);
CustomElementReactionsStack* reactionsStack =
docGroup->CustomElementReactionsStack();
CandidateFinder finder(*candidates, mWindow->GetExtantDoc());
for (auto& elem : finder.OrderedCandidates()) {
reactionsStack->EnqueueUpgradeReaction(elem, aDefinition);
}
}
}
JSObject*
CustomElementRegistry::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return CustomElementRegistryBinding::Wrap(aCx, this, aGivenProto);
}
nsISupports* CustomElementRegistry::GetParentObject() const
{
return mWindow;
}
DocGroup*
CustomElementRegistry::GetDocGroup() const
{
return mWindow ? mWindow->GetDocGroup() : nullptr;
}
// https://html.spec.whatwg.org/multipage/scripting.html#element-definition
void
CustomElementRegistry::Define(JSContext* aCx,
const nsAString& aName,
Function& aFunctionConstructor,
const ElementDefinitionOptions& aOptions,
ErrorResult& aRv)
{
// Note: No calls that might run JS or trigger CC before this point, or
// there's a (vanishingly small) chance of our constructor being nulled
// before we access it.
JS::Rooted<JSObject*> constructor(aCx, aFunctionConstructor.CallableOrNull());
/**
* 1. If IsConstructor(constructor) is false, then throw a TypeError and abort
* these steps.
*/
// For now, all wrappers are constructable if they are callable. So we need to
// unwrap constructor to check it is really constructable.
JS::Rooted<JSObject*> constructorUnwrapped(aCx, js::CheckedUnwrap(constructor));
if (!constructorUnwrapped) {
// If the caller's compartment does not have permission to access the
// unwrapped constructor then throw.
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
if (!JS::IsConstructor(constructorUnwrapped)) {
aRv.ThrowTypeError<MSG_NOT_CONSTRUCTOR>(NS_LITERAL_STRING("Argument 2 of CustomElementRegistry.define"));
return;
}
/**
* 2. If name is not a valid custom element name, then throw a "SyntaxError"
* DOMException and abort these steps.
*/
nsIDocument* doc = mWindow->GetExtantDoc();
uint32_t nameSpaceID = doc ? doc->GetDefaultNamespaceID() : kNameSpaceID_XHTML;
RefPtr<nsAtom> nameAtom(NS_Atomize(aName));
if (!nsContentUtils::IsCustomElementName(nameAtom, nameSpaceID)) {
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
/**
* 3. If this CustomElementRegistry contains an entry with name name, then
* throw a "NotSupportedError" DOMException and abort these steps.
*/
if (mCustomDefinitions.GetWeak(nameAtom)) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
/**
* 4. If this CustomElementRegistry contains an entry with constructor constructor,
* then throw a "NotSupportedError" DOMException and abort these steps.
*/
const auto& ptr = mConstructors.lookup(constructorUnwrapped);
if (ptr) {
MOZ_ASSERT(mCustomDefinitions.GetWeak(ptr->value()),
"Definition must be found in mCustomDefinitions");
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
/**
* 5. Let localName be name.
* 6. Let extends be the value of the extends member of options, or null if
* no such member exists.
* 7. If extends is not null, then:
* 1. If extends is a valid custom element name, then throw a
* "NotSupportedError" DOMException.
* 2. If the element interface for extends and the HTML namespace is
* HTMLUnknownElement (e.g., if extends does not indicate an element
* definition in this specification), then throw a "NotSupportedError"
* DOMException.
* 3. Set localName to extends.
*
* Special note for XUL elements:
*
* For step 7.1, we'll subject XUL to the same rules as HTML, so that a
* custom built-in element will not be extending from a dashed name.
* Step 7.2 is disregarded. But, we do check if the name is a dashed name
* (i.e. step 2) given that there is no reason for a custom built-in element
* type to take on a non-dashed name.
* This also ensures the name of the built-in custom element type can never
* be the same as the built-in element name, so we don't break the assumption
* elsewhere.
*/
nsAutoString localName(aName);
if (aOptions.mExtends.WasPassed()) {
RefPtr<nsAtom> extendsAtom(NS_Atomize(aOptions.mExtends.Value()));
if (nsContentUtils::IsCustomElementName(extendsAtom, kNameSpaceID_XHTML)) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
if (nameSpaceID == kNameSpaceID_XHTML) {
// bgsound and multicol are unknown html element.
int32_t tag = nsHTMLTags::CaseSensitiveAtomTagToId(extendsAtom);
if (tag == eHTMLTag_userdefined ||
tag == eHTMLTag_bgsound ||
tag == eHTMLTag_multicol) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
} else { // kNameSpaceID_XUL
// As stated above, ensure the name of the customized built-in element
// (the one that goes to the |is| attribute) is a dashed name.
if (!nsContentUtils::IsNameWithDash(nameAtom)) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
}
localName.Assign(aOptions.mExtends.Value());
}
/**
* 8. If this CustomElementRegistry's element definition is running flag is set,
* then throw a "NotSupportedError" DOMException and abort these steps.
*/
if (mIsCustomDefinitionRunning) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
auto callbacksHolder = MakeUnique<LifecycleCallbacks>();
nsTArray<RefPtr<nsAtom>> observedAttributes;
{ // Set mIsCustomDefinitionRunning.
/**
* 9. Set this CustomElementRegistry's element definition is running flag.
*/
AutoSetRunningFlag as(this);
/**
* 10.1. Let prototype be Get(constructor, "prototype"). Rethrow any exceptions.
*/
// The .prototype on the constructor passed could be an "expando" of a
// wrapper. So we should get it from wrapper instead of the underlying
// object.
JS::Rooted<JS::Value> prototype(aCx);
if (!JS_GetProperty(aCx, constructor, "prototype", &prototype)) {
aRv.NoteJSContextException(aCx);
return;
}
/**
* 10.2. If Type(prototype) is not Object, then throw a TypeError exception.
*/
if (!prototype.isObject()) {
aRv.ThrowTypeError<MSG_NOT_OBJECT>(NS_LITERAL_STRING("constructor.prototype"));
return;
}
/**
* 10.3. Let lifecycleCallbacks be a map with the four keys
* "connectedCallback", "disconnectedCallback", "adoptedCallback", and
* "attributeChangedCallback", each of which belongs to an entry whose
* value is null.
* 10.4. For each of the four keys callbackName in lifecycleCallbacks:
* 1. Let callbackValue be Get(prototype, callbackName). Rethrow any
* exceptions.
* 2. If callbackValue is not undefined, then set the value of the
* entry in lifecycleCallbacks with key callbackName to the result
* of converting callbackValue to the Web IDL Function callback type.
* Rethrow any exceptions from the conversion.
*/
if (!callbacksHolder->Init(aCx, prototype)) {
aRv.NoteJSContextException(aCx);
return;
}
/**
* 10.5. Let observedAttributes be an empty sequence<DOMString>.
* 10.6. If the value of the entry in lifecycleCallbacks with key
* "attributeChangedCallback" is not null, then:
* 1. Let observedAttributesIterable be Get(constructor,
* "observedAttributes"). Rethrow any exceptions.
* 2. If observedAttributesIterable is not undefined, then set
* observedAttributes to the result of converting
* observedAttributesIterable to a sequence<DOMString>. Rethrow
* any exceptions from the conversion.
*/
if (callbacksHolder->mAttributeChangedCallback.WasPassed()) {
JS::Rooted<JS::Value> observedAttributesIterable(aCx);
if (!JS_GetProperty(aCx, constructor, "observedAttributes",
&observedAttributesIterable)) {
aRv.NoteJSContextException(aCx);
return;
}
if (!observedAttributesIterable.isUndefined()) {
if (!observedAttributesIterable.isObject()) {
aRv.ThrowTypeError<MSG_NOT_SEQUENCE>(NS_LITERAL_STRING("observedAttributes"));
return;
}
JS::ForOfIterator iter(aCx);
if (!iter.init(observedAttributesIterable, JS::ForOfIterator::AllowNonIterable)) {
aRv.NoteJSContextException(aCx);
return;
}
if (!iter.valueIsIterable()) {
aRv.ThrowTypeError<MSG_NOT_SEQUENCE>(NS_LITERAL_STRING("observedAttributes"));
return;
}
JS::Rooted<JS::Value> attribute(aCx);
while (true) {
bool done;
if (!iter.next(&attribute, &done)) {
aRv.NoteJSContextException(aCx);
return;
}
if (done) {
break;
}
nsAutoString attrStr;
if (!ConvertJSValueToString(aCx, attribute, eStringify, eStringify, attrStr)) {
aRv.NoteJSContextException(aCx);
return;
}
if (!observedAttributes.AppendElement(NS_Atomize(attrStr))) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
}
}
} // Unset mIsCustomDefinitionRunning
/**
* 11. Let definition be a new custom element definition with name name,
* local name localName, constructor constructor, prototype prototype,
* observed attributes observedAttributes, and lifecycle callbacks
* lifecycleCallbacks.
*/
// Associate the definition with the custom element.
RefPtr<nsAtom> localNameAtom(NS_Atomize(localName));
/**
* 12. Add definition to this CustomElementRegistry.
*/
if (!mConstructors.put(constructorUnwrapped, nameAtom)) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
RefPtr<CustomElementDefinition> definition =
new CustomElementDefinition(nameAtom,
localNameAtom,
&aFunctionConstructor,
std::move(observedAttributes),
std::move(callbacksHolder));
CustomElementDefinition* def = definition.get();
mCustomDefinitions.Put(nameAtom, definition.forget());
MOZ_ASSERT(mCustomDefinitions.Count() == mConstructors.count(),
"Number of entries should be the same");
/**
* 13. 14. 15. Upgrade candidates
*/
UpgradeCandidates(nameAtom, def, aRv);
/**
* 16. If this CustomElementRegistry's when-defined promise map contains an
* entry with key name:
* 1. Let promise be the value of that entry.
* 2. Resolve promise with undefined.
* 3. Delete the entry with key name from this CustomElementRegistry's
* when-defined promise map.
*/
RefPtr<Promise> promise;
mWhenDefinedPromiseMap.Remove(nameAtom, getter_AddRefs(promise));
if (promise) {
promise->MaybeResolveWithUndefined();
}
/**
* Clean-up mElementCreationCallbacks (if it exists)
*/
mElementCreationCallbacks.Remove(nameAtom);
}
void
CustomElementRegistry::SetElementCreationCallback(const nsAString& aName,
CustomElementCreationCallback& aCallback,
ErrorResult& aRv)
{
RefPtr<nsAtom> nameAtom(NS_Atomize(aName));
if (mElementCreationCallbacks.GetWeak(nameAtom) ||
mCustomDefinitions.GetWeak(nameAtom)) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
RefPtr<CustomElementCreationCallback> callback = &aCallback;
mElementCreationCallbacks.Put(nameAtom, callback.forget());
return;
}
static void
TryUpgrade(nsINode& aNode)
{
Element* element = aNode.IsElement() ? aNode.AsElement() : nullptr;
if (element) {
CustomElementData* ceData = element->GetCustomElementData();
if (ceData) {
NodeInfo* nodeInfo = element->NodeInfo();
nsAtom* typeAtom = ceData->GetCustomElementType();
CustomElementDefinition* definition =
nsContentUtils::LookupCustomElementDefinition(nodeInfo->GetDocument(),
nodeInfo->NameAtom(),
nodeInfo->NamespaceID(),
typeAtom);
if (definition) {
nsContentUtils::EnqueueUpgradeReaction(element, definition);
}
}
if (ShadowRoot* root = element->GetShadowRoot()) {
for (Element* child = root->GetFirstElementChild(); child;
child = child->GetNextElementSibling()) {
TryUpgrade(*child);
}
}
}
for (Element* child = aNode.GetFirstElementChild(); child;
child = child->GetNextElementSibling()) {
TryUpgrade(*child);
}
}
void
CustomElementRegistry::Upgrade(nsINode& aRoot)
{
TryUpgrade(aRoot);
}
void
CustomElementRegistry::Get(JSContext* aCx, const nsAString& aName,
JS::MutableHandle<JS::Value> aRetVal)
{
RefPtr<nsAtom> nameAtom(NS_Atomize(aName));
CustomElementDefinition* data = mCustomDefinitions.GetWeak(nameAtom);
if (!data) {
aRetVal.setUndefined();
return;
}
aRetVal.setObject(*data->mConstructor->Callback(aCx));
}
already_AddRefed<Promise>
CustomElementRegistry::WhenDefined(const nsAString& aName, ErrorResult& aRv)
{
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(mWindow);
RefPtr<Promise> promise = Promise::Create(global, aRv);
if (aRv.Failed()) {
return nullptr;
}
RefPtr<nsAtom> nameAtom(NS_Atomize(aName));
nsIDocument* doc = mWindow->GetExtantDoc();
uint32_t nameSpaceID = doc ? doc->GetDefaultNamespaceID() : kNameSpaceID_XHTML;
if (!nsContentUtils::IsCustomElementName(nameAtom, nameSpaceID)) {
promise->MaybeReject(NS_ERROR_DOM_SYNTAX_ERR);
return promise.forget();
}
if (mCustomDefinitions.GetWeak(nameAtom)) {
promise->MaybeResolve(JS::UndefinedHandleValue);
return promise.forget();
}
auto entry = mWhenDefinedPromiseMap.LookupForAdd(nameAtom);
if (entry) {
promise = entry.Data();
} else {
entry.OrInsert([&promise](){ return promise; });
}
return promise.forget();
}
namespace {
static void
DoUpgrade(Element* aElement,
CustomElementConstructor* aConstructor,
ErrorResult& aRv)
{
// Rethrow the exception since it might actually throw the exception from the
// upgrade steps back out to the caller of document.createElement.
RefPtr<Element> constructResult =
aConstructor->Construct("Custom Element Upgrade", aRv);
if (aRv.Failed()) {
return;
}
if (!constructResult || constructResult.get() != aElement) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
}
} // anonymous namespace
// https://html.spec.whatwg.org/multipage/scripting.html#upgrades
/* static */ void
CustomElementRegistry::Upgrade(Element* aElement,
CustomElementDefinition* aDefinition,
ErrorResult& aRv)
{
RefPtr<CustomElementData> data = aElement->GetCustomElementData();
MOZ_ASSERT(data, "CustomElementData should exist");
// Step 1 and step 2.
if (data->mState == CustomElementData::State::eCustom ||
data->mState == CustomElementData::State::eFailed) {
return;
}
// Step 3.
if (!aDefinition->mObservedAttributes.IsEmpty()) {
uint32_t count = aElement->GetAttrCount();
for (uint32_t i = 0; i < count; i++) {
mozilla::dom::BorrowedAttrInfo info = aElement->GetAttrInfoAt(i);
const nsAttrName* name = info.mName;
nsAtom* attrName = name->LocalName();
if (aDefinition->IsInObservedAttributeList(attrName)) {
int32_t namespaceID = name->NamespaceID();
nsAutoString attrValue, namespaceURI;
info.mValue->ToString(attrValue);
nsContentUtils::NameSpaceManager()->GetNameSpaceURI(namespaceID,
namespaceURI);
LifecycleCallbackArgs args = {
nsDependentAtomString(attrName),
VoidString(),
attrValue,
(namespaceURI.IsEmpty() ? VoidString() : namespaceURI)
};
nsContentUtils::EnqueueLifecycleCallback(nsIDocument::eAttributeChanged,
aElement,
&args, nullptr, aDefinition);
}
}
}
// Step 4.
if (aElement->IsInComposedDoc()) {
nsContentUtils::EnqueueLifecycleCallback(nsIDocument::eConnected, aElement,
nullptr, nullptr, aDefinition);
}
// Step 5.
AutoConstructionStackEntry acs(aDefinition->mConstructionStack, aElement);
// Step 6 and step 7.
DoUpgrade(aElement, aDefinition->mConstructor, aRv);
if (aRv.Failed()) {
data->mState = CustomElementData::State::eFailed;
// Empty element's custom element reaction queue.
data->mReactionQueue.Clear();
return;
}
// Step 8.
data->mState = CustomElementData::State::eCustom;
// Step 9.
aElement->SetCustomElementDefinition(aDefinition);
}
//-----------------------------------------------------
// CustomElementReactionsStack
void
CustomElementReactionsStack::CreateAndPushElementQueue()
{
MOZ_ASSERT(mRecursionDepth);
MOZ_ASSERT(!mIsElementQueuePushedForCurrentRecursionDepth);
// Push a new element queue onto the custom element reactions stack.
mReactionsStack.AppendElement(MakeUnique<ElementQueue>());
mIsElementQueuePushedForCurrentRecursionDepth = true;
}
void
CustomElementReactionsStack::PopAndInvokeElementQueue()
{
MOZ_ASSERT(mRecursionDepth);
MOZ_ASSERT(mIsElementQueuePushedForCurrentRecursionDepth);
MOZ_ASSERT(!mReactionsStack.IsEmpty(),
"Reaction stack shouldn't be empty");
// Pop the element queue from the custom element reactions stack,
// and invoke custom element reactions in that queue.
const uint32_t lastIndex = mReactionsStack.Length() - 1;
ElementQueue* elementQueue = mReactionsStack.ElementAt(lastIndex).get();
// Check element queue size in order to reduce function call overhead.
if (!elementQueue->IsEmpty()) {
// It is still not clear what error reporting will look like in custom
// element, see https://github.com/w3c/webcomponents/issues/635.
// We usually report the error to entry global in gecko, so just follow the
// same behavior here.
// This may be null if it's called from parser, see the case of
// attributeChangedCallback in
// https://html.spec.whatwg.org/multipage/parsing.html#create-an-element-for-the-token
// In that case, the exception of callback reactions will be automatically
// reported in CallSetup.
nsIGlobalObject* global = GetEntryGlobal();
InvokeReactions(elementQueue, global);
}
// InvokeReactions() might create other custom element reactions, but those
// new reactions should be already consumed and removed at this point.
MOZ_ASSERT(lastIndex == mReactionsStack.Length() - 1,
"reactions created by InvokeReactions() should be consumed and removed");
mReactionsStack.RemoveElementAt(lastIndex);
mIsElementQueuePushedForCurrentRecursionDepth = false;
}
void
CustomElementReactionsStack::EnqueueUpgradeReaction(Element* aElement,
CustomElementDefinition* aDefinition)
{
Enqueue(aElement, new CustomElementUpgradeReaction(aDefinition));
}
void
CustomElementReactionsStack::EnqueueCallbackReaction(Element* aElement,
UniquePtr<CustomElementCallback> aCustomElementCallback)
{
Enqueue(aElement, new CustomElementCallbackReaction(std::move(aCustomElementCallback)));
}
void
CustomElementReactionsStack::Enqueue(Element* aElement,
CustomElementReaction* aReaction)
{
RefPtr<CustomElementData> elementData = aElement->GetCustomElementData();
MOZ_ASSERT(elementData, "CustomElementData should exist");
if (mRecursionDepth) {
// If the element queue is not created for current recursion depth, create
// and push an element queue to reactions stack first.
if (!mIsElementQueuePushedForCurrentRecursionDepth) {
CreateAndPushElementQueue();
}
MOZ_ASSERT(!mReactionsStack.IsEmpty());
// Add element to the current element queue.
mReactionsStack.LastElement()->AppendElement(aElement);
elementData->mReactionQueue.AppendElement(aReaction);
return;
}
// If the custom element reactions stack is empty, then:
// Add element to the backup element queue.
MOZ_ASSERT(mReactionsStack.IsEmpty(),
"custom element reactions stack should be empty");
MOZ_ASSERT(!aReaction->IsUpgradeReaction() ||
nsContentUtils::IsChromeDoc(aElement->OwnerDoc()),
"Upgrade reaction should not be scheduled to backup queue "
"except when Custom Element is used inside XBL (in chrome).");
mBackupQueue.AppendElement(aElement);
elementData->mReactionQueue.AppendElement(aReaction);
if (mIsBackupQueueProcessing) {
return;
}
CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
RefPtr<BackupQueueMicroTask> bqmt = new BackupQueueMicroTask(this);
context->DispatchToMicroTask(bqmt.forget());
}
void
CustomElementReactionsStack::InvokeBackupQueue()
{
// Check backup queue size in order to reduce function call overhead.
if (!mBackupQueue.IsEmpty()) {
// Upgrade reactions won't be scheduled in backup queue and the exception of
// callback reactions will be automatically reported in CallSetup.
// If the reactions are invoked from backup queue (in microtask check point),
// we don't need to pass global object for error reporting.
InvokeReactions(&mBackupQueue, nullptr);
}
MOZ_ASSERT(mBackupQueue.IsEmpty(),
"There are still some reactions in BackupQueue not being consumed!?!");
}
void
CustomElementReactionsStack::InvokeReactions(ElementQueue* aElementQueue,
nsIGlobalObject* aGlobal)
{
// This is used for error reporting.
Maybe<AutoEntryScript> aes;
if (aGlobal) {
aes.emplace(aGlobal, "custom elements reaction invocation");
}
// Note: It's possible to re-enter this method.
for (uint32_t i = 0; i < aElementQueue->Length(); ++i) {
Element* element = aElementQueue->ElementAt(i);
// ElementQueue hold a element's strong reference, it should not be a nullptr.
MOZ_ASSERT(element);
RefPtr<CustomElementData> elementData = element->GetCustomElementData();
if (!elementData || !element->GetOwnerGlobal()) {
// This happens when the document is destroyed and the element is already
// unlinked, no need to fire the callbacks in this case.
continue;
}
auto& reactions = elementData->mReactionQueue;
for (uint32_t j = 0; j < reactions.Length(); ++j) {
// Transfer the ownership of the entry due to reentrant invocation of
// this function.
auto reaction(std::move(reactions.ElementAt(j)));
if (reaction) {
if (!aGlobal && reaction->IsUpgradeReaction()) {
// This is for the special case when custom element is included
// inside XBL.
MOZ_ASSERT(nsContentUtils::IsChromeDoc(element->OwnerDoc()));
nsIGlobalObject* global = element->GetOwnerGlobal();
MOZ_ASSERT(!aes);
aes.emplace(global, "custom elements reaction invocation");
}
ErrorResult rv;
reaction->Invoke(element, rv);
if (aes) {
JSContext* cx = aes->cx();
if (rv.MaybeSetPendingException(cx)) {
aes->ReportException();
}
MOZ_ASSERT(!JS_IsExceptionPending(cx));
if (!aGlobal && reaction->IsUpgradeReaction()) {
aes.reset();
}
}
MOZ_ASSERT(!rv.Failed());
}
}
reactions.Clear();
}
aElementQueue->Clear();
}
//-----------------------------------------------------
// CustomElementDefinition
NS_IMPL_CYCLE_COLLECTION_CLASS(CustomElementDefinition)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CustomElementDefinition)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mConstructor)
tmp->mCallbacks = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(CustomElementDefinition)
mozilla::dom::LifecycleCallbacks* callbacks = tmp->mCallbacks.get();
if (callbacks->mAttributeChangedCallback.WasPassed()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb,
"mCallbacks->mAttributeChangedCallback");
cb.NoteXPCOMChild(callbacks->mAttributeChangedCallback.Value());
}
if (callbacks->mConnectedCallback.WasPassed()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mCallbacks->mConnectedCallback");
cb.NoteXPCOMChild(callbacks->mConnectedCallback.Value());
}
if (callbacks->mDisconnectedCallback.WasPassed()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mCallbacks->mDisconnectedCallback");
cb.NoteXPCOMChild(callbacks->mDisconnectedCallback.Value());
}
if (callbacks->mAdoptedCallback.WasPassed()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mCallbacks->mAdoptedCallback");
cb.NoteXPCOMChild(callbacks->mAdoptedCallback.Value());
}
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mConstructor");
cb.NoteXPCOMChild(tmp->mConstructor);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(CustomElementDefinition)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(CustomElementDefinition, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(CustomElementDefinition, Release)
CustomElementDefinition::CustomElementDefinition(nsAtom* aType,
nsAtom* aLocalName,
Function* aConstructor,
nsTArray<RefPtr<nsAtom>>&& aObservedAttributes,
UniquePtr<LifecycleCallbacks>&& aCallbacks)
: mType(aType),
mLocalName(aLocalName),
mConstructor(new CustomElementConstructor(aConstructor)),
mObservedAttributes(std::move(aObservedAttributes)),
mCallbacks(std::move(aCallbacks))
{
}
} // namespace dom
} // namespace mozilla
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