gecko-dev/dom/html/HTMLPropertiesCollection.cpp

519 строки
14 KiB
C++

/* -*- 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 "HTMLPropertiesCollection.h"
#include "nsIDocument.h"
#include "nsContentUtils.h"
#include "nsGenericHTMLElement.h"
#include "nsVariant.h"
#include "nsDOMSettableTokenList.h"
#include "nsAttrValue.h"
#include "nsWrapperCacheInlines.h"
#include "mozilla/dom/HTMLPropertiesCollectionBinding.h"
#include "jsapi.h"
#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLPropertiesCollection)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(HTMLPropertiesCollection)
// SetDocument(nullptr) ensures that we remove ourselves as a mutation observer
tmp->SetDocument(nullptr);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNames)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNamedItemEntries)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mProperties)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(HTMLPropertiesCollection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDoc)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNames)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNamedItemEntries);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mProperties)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(HTMLPropertiesCollection)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
HTMLPropertiesCollection::HTMLPropertiesCollection(nsGenericHTMLElement* aRoot)
: mRoot(aRoot)
, mDoc(aRoot->GetUncomposedDoc())
, mIsDirty(true)
{
mNames = new PropertyStringList(this);
if (mDoc) {
mDoc->AddMutationObserver(this);
}
}
HTMLPropertiesCollection::~HTMLPropertiesCollection()
{
if (mDoc) {
mDoc->RemoveMutationObserver(this);
}
}
NS_INTERFACE_TABLE_HEAD(HTMLPropertiesCollection)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(HTMLPropertiesCollection,
nsIDOMHTMLCollection,
nsIHTMLCollection,
nsIMutationObserver)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(HTMLPropertiesCollection)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(HTMLPropertiesCollection)
NS_IMPL_CYCLE_COLLECTING_RELEASE(HTMLPropertiesCollection)
void
HTMLPropertiesCollection::SetDocument(nsIDocument* aDocument) {
if (mDoc) {
mDoc->RemoveMutationObserver(this);
}
mDoc = aDocument;
if (mDoc) {
mDoc->AddMutationObserver(this);
}
for (auto iter = mNamedItemEntries.Iter(); !iter.Done(); iter.Next()) {
iter.UserData()->SetDocument(aDocument);
}
mIsDirty = true;
}
JSObject*
HTMLPropertiesCollection::WrapObject(JSContext* cx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLPropertiesCollectionBinding::Wrap(cx, this, aGivenProto);
}
NS_IMETHODIMP
HTMLPropertiesCollection::GetLength(uint32_t* aLength)
{
EnsureFresh();
*aLength = mProperties.Length();
return NS_OK;
}
NS_IMETHODIMP
HTMLPropertiesCollection::Item(uint32_t aIndex, nsIDOMNode** aResult)
{
nsINode* result = nsIHTMLCollection::Item(aIndex);
if (result) {
NS_ADDREF(*aResult = result->AsDOMNode());
} else {
*aResult = nullptr;
}
return NS_OK;
}
NS_IMETHODIMP
HTMLPropertiesCollection::NamedItem(const nsAString& aName,
nsIDOMNode** aResult)
{
*aResult = nullptr;
return NS_OK;
}
Element*
HTMLPropertiesCollection::GetElementAt(uint32_t aIndex)
{
EnsureFresh();
return mProperties.SafeElementAt(aIndex);
}
nsINode*
HTMLPropertiesCollection::GetParentObject()
{
return mRoot;
}
PropertyNodeList*
HTMLPropertiesCollection::NamedItem(const nsAString& aName)
{
EnsureFresh();
PropertyNodeList* propertyList = mNamedItemEntries.GetWeak(aName);
if (!propertyList) {
RefPtr<PropertyNodeList> newPropertyList =
new PropertyNodeList(this, mRoot, aName);
mNamedItemEntries.Put(aName, newPropertyList);
propertyList = newPropertyList;
}
return propertyList;
}
void
HTMLPropertiesCollection::AttributeChanged(nsIDocument *aDocument, Element* aElement,
int32_t aNameSpaceID, nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
mIsDirty = true;
}
void
HTMLPropertiesCollection::ContentAppended(nsIDocument* aDocument, nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
mIsDirty = true;
}
void
HTMLPropertiesCollection::ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
mIsDirty = true;
}
void
HTMLPropertiesCollection::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
mIsDirty = true;
}
void
HTMLPropertiesCollection::EnsureFresh()
{
if (mDoc && !mIsDirty) {
return;
}
mIsDirty = false;
mProperties.Clear();
mNames->Clear();
// We don't clear NamedItemEntries because the PropertyNodeLists must be live.
for (auto iter = mNamedItemEntries.Iter(); !iter.Done(); iter.Next()) {
iter.UserData()->SetDirty();
}
if (!mRoot->HasAttr(kNameSpaceID_None, nsGkAtoms::itemscope)) {
return;
}
CrawlProperties();
TreeOrderComparator comparator;
mProperties.Sort(comparator);
// Create the names DOMStringList
uint32_t count = mProperties.Length();
for (uint32_t i = 0; i < count; ++i) {
const nsAttrValue* attr = mProperties.ElementAt(i)->GetParsedAttr(nsGkAtoms::itemprop);
for (uint32_t i = 0; i < attr->GetAtomCount(); i++) {
nsDependentAtomString propName(attr->AtomAt(i));
bool contains = mNames->ContainsInternal(propName);
if (!contains) {
mNames->Add(propName);
}
}
}
}
static Element*
GetElementByIdForConnectedSubtree(nsIContent* aContent, const nsIAtom* aId)
{
aContent = static_cast<nsIContent*>(aContent->SubtreeRoot());
do {
if (aContent->GetID() == aId) {
return aContent->AsElement();
}
aContent = aContent->GetNextNode();
} while(aContent);
return nullptr;
}
void
HTMLPropertiesCollection::CrawlProperties()
{
nsIDocument* doc = mRoot->GetUncomposedDoc();
const nsAttrValue* attr = mRoot->GetParsedAttr(nsGkAtoms::itemref);
if (attr) {
for (uint32_t i = 0; i < attr->GetAtomCount(); i++) {
nsIAtom* ref = attr->AtomAt(i);
Element* element;
if (doc) {
element = doc->GetElementById(nsDependentAtomString(ref));
} else {
element = GetElementByIdForConnectedSubtree(mRoot, ref);
}
if (element && element != mRoot) {
CrawlSubtree(element);
}
}
}
CrawlSubtree(mRoot);
}
void
HTMLPropertiesCollection::CrawlSubtree(Element* aElement)
{
nsIContent* aContent = aElement;
while (aContent) {
// We must check aContent against mRoot because
// an element must not be its own property
if (aContent == mRoot || !aContent->IsHTMLElement()) {
// Move on to the next node in the tree
aContent = aContent->GetNextNode(aElement);
} else {
MOZ_ASSERT(aContent->IsElement(), "IsHTMLElement() returned true!");
Element* element = aContent->AsElement();
if (element->HasAttr(kNameSpaceID_None, nsGkAtoms::itemprop) &&
!mProperties.Contains(element)) {
mProperties.AppendElement(static_cast<nsGenericHTMLElement*>(element));
}
if (element->HasAttr(kNameSpaceID_None, nsGkAtoms::itemscope)) {
aContent = element->GetNextNonChildNode(aElement);
} else {
aContent = element->GetNextNode(aElement);
}
}
}
}
void
HTMLPropertiesCollection::GetSupportedNames(unsigned, nsTArray<nsString>& aNames)
{
EnsureFresh();
mNames->CopyList(aNames);
}
PropertyNodeList::PropertyNodeList(HTMLPropertiesCollection* aCollection,
nsIContent* aParent, const nsAString& aName)
: mName(aName),
mDoc(aParent->GetUncomposedDoc()),
mCollection(aCollection),
mParent(aParent),
mIsDirty(true)
{
if (mDoc) {
mDoc->AddMutationObserver(this);
}
}
PropertyNodeList::~PropertyNodeList()
{
if (mDoc) {
mDoc->RemoveMutationObserver(this);
}
}
void
PropertyNodeList::SetDocument(nsIDocument* aDoc)
{
if (mDoc) {
mDoc->RemoveMutationObserver(this);
}
mDoc = aDoc;
if (mDoc) {
mDoc->AddMutationObserver(this);
}
mIsDirty = true;
}
NS_IMETHODIMP
PropertyNodeList::GetLength(uint32_t* aLength)
{
EnsureFresh();
*aLength = mElements.Length();
return NS_OK;
}
NS_IMETHODIMP
PropertyNodeList::Item(uint32_t aIndex, nsIDOMNode** aReturn)
{
EnsureFresh();
nsINode* element = mElements.SafeElementAt(aIndex);
if (!element) {
*aReturn = nullptr;
return NS_OK;
}
return CallQueryInterface(element, aReturn);
}
nsIContent*
PropertyNodeList::Item(uint32_t aIndex)
{
EnsureFresh();
return mElements.SafeElementAt(aIndex);
}
int32_t
PropertyNodeList::IndexOf(nsIContent* aContent)
{
EnsureFresh();
return mElements.IndexOf(aContent);
}
nsINode*
PropertyNodeList::GetParentObject()
{
return mParent;
}
JSObject*
PropertyNodeList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
{
return PropertyNodeListBinding::Wrap(cx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(PropertyNodeList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(PropertyNodeList)
// SetDocument(nullptr) ensures that we remove ourselves as a mutation observer
tmp->SetDocument(nullptr);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCollection)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mElements)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(PropertyNodeList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDoc)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCollection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElements)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(PropertyNodeList)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(PropertyNodeList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(PropertyNodeList)
NS_INTERFACE_TABLE_HEAD(PropertyNodeList)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(PropertyNodeList,
nsIDOMNodeList,
nsINodeList,
nsIMutationObserver)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(PropertyNodeList)
NS_INTERFACE_MAP_END
void
PropertyNodeList::GetValues(JSContext* aCx, nsTArray<JS::Value >& aResult,
ErrorResult& aError)
{
EnsureFresh();
JS::Rooted<JSObject*> wrapper(aCx, GetWrapper());
JSAutoCompartment ac(aCx, wrapper);
uint32_t length = mElements.Length();
for (uint32_t i = 0; i < length; ++i) {
JS::Rooted<JS::Value> v(aCx);
mElements.ElementAt(i)->GetItemValue(aCx, wrapper, &v, aError);
if (aError.Failed()) {
return;
}
aResult.AppendElement(v);
}
}
void
PropertyNodeList::AttributeChanged(nsIDocument* aDocument, Element* aElement,
int32_t aNameSpaceID, nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
mIsDirty = true;
}
void
PropertyNodeList::ContentAppended(nsIDocument* aDocument, nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
mIsDirty = true;
}
void
PropertyNodeList::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
mIsDirty = true;
}
void
PropertyNodeList::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
mIsDirty = true;
}
void
PropertyNodeList::EnsureFresh()
{
if (mDoc && !mIsDirty) {
return;
}
mIsDirty = false;
mCollection->EnsureFresh();
Clear();
uint32_t count = mCollection->mProperties.Length();
for (uint32_t i = 0; i < count; ++i) {
nsGenericHTMLElement* element = mCollection->mProperties.ElementAt(i);
const nsAttrValue* attr = element->GetParsedAttr(nsGkAtoms::itemprop);
if (attr->Contains(mName)) {
AppendElement(element);
}
}
}
PropertyStringList::PropertyStringList(HTMLPropertiesCollection* aCollection)
: DOMStringList()
, mCollection(aCollection)
{ }
PropertyStringList::~PropertyStringList()
{ }
NS_IMPL_CYCLE_COLLECTION_INHERITED(PropertyStringList, DOMStringList,
mCollection)
NS_IMPL_ADDREF_INHERITED(PropertyStringList, DOMStringList)
NS_IMPL_RELEASE_INHERITED(PropertyStringList, DOMStringList)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PropertyStringList)
NS_INTERFACE_MAP_END_INHERITING(DOMStringList)
void
PropertyStringList::EnsureFresh()
{
MOZ_ASSERT(NS_IsMainThread());
mCollection->EnsureFresh();
}
bool
PropertyStringList::ContainsInternal(const nsAString& aString)
{
// This method should not call EnsureFresh, otherwise we may become stuck in an infinite loop.
return mNames.Contains(aString);
}
} // namespace dom
} // namespace mozilla