gecko-dev/dom/base/nsDOMAttributeMap.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/. */
/*
* Implementation of the |attributes| property of DOM Core's Element object.
*/
#include "nsDOMAttributeMap.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Attr.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/NamedNodeMapBinding.h"
#include "nsAttrName.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsIContentInlines.h"
#include "nsIDocument.h"
#include "nsNameSpaceManager.h"
#include "nsNodeInfoManager.h"
#include "nsUnicharUtils.h"
#include "nsWrapperCacheInlines.h"
using namespace mozilla;
using namespace mozilla::dom;
//----------------------------------------------------------------------
nsDOMAttributeMap::nsDOMAttributeMap(Element* aContent)
: mContent(aContent)
{
// We don't add a reference to our content. If it goes away,
// we'll be told to drop our reference
}
/**
* Clear map pointer for attributes.
*/
PLDHashOperator
RemoveMapRef(nsAttrHashKey::KeyType aKey, nsRefPtr<Attr>& aData,
void* aUserArg)
{
aData->SetMap(nullptr);
return PL_DHASH_REMOVE;
}
nsDOMAttributeMap::~nsDOMAttributeMap()
{
if (mAttributeCache) {
mAttributeCache->Enumerate(RemoveMapRef, nullptr);
}
}
void
nsDOMAttributeMap::DropReference()
{
if (mAttributeCache) {
mAttributeCache->Enumerate(RemoveMapRef, nullptr);
}
mContent = nullptr;
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMAttributeMap)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMAttributeMap)
tmp->DropReference();
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mContent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
PLDHashOperator
TraverseMapEntry(nsAttrHashKey::KeyType aKey, nsRefPtr<Attr>& aData,
void* aUserArg)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(aUserArg);
cb->NoteXPCOMChild(static_cast<nsINode*>(aData.get()));
return PL_DHASH_NEXT;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMAttributeMap)
if (tmp->mAttributeCache) {
tmp->mAttributeCache->Enumerate(TraverseMapEntry, &cb);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsDOMAttributeMap)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMAttributeMap)
if (tmp->IsBlack()) {
if (tmp->mContent) {
// The map owns the element so we can mark it when the
// map itself is certainly alive.
mozilla::dom::FragmentOrElement::MarkNodeChildren(tmp->mContent);
}
return true;
}
if (tmp->mContent &&
mozilla::dom::FragmentOrElement::CanSkip(tmp->mContent, true)) {
return true;
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMAttributeMap)
return tmp->IsBlackAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMAttributeMap)
return tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
// QueryInterface implementation for nsDOMAttributeMap
NS_INTERFACE_TABLE_HEAD(nsDOMAttributeMap)
NS_INTERFACE_TABLE(nsDOMAttributeMap, nsIDOMMozNamedAttrMap)
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMAttributeMap)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMAttributeMap)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMAttributeMap)
PLDHashOperator
SetOwnerDocumentFunc(nsAttrHashKey::KeyType aKey,
nsRefPtr<Attr>& aData,
void* aUserArg)
{
nsresult rv = aData->SetOwnerDocument(static_cast<nsIDocument*>(aUserArg));
return NS_FAILED(rv) ? PL_DHASH_STOP : PL_DHASH_NEXT;
}
nsresult
nsDOMAttributeMap::SetOwnerDocument(nsIDocument* aDocument)
{
if (mAttributeCache) {
uint32_t n = mAttributeCache->Enumerate(SetOwnerDocumentFunc, aDocument);
NS_ENSURE_TRUE(n == mAttributeCache->Count(), NS_ERROR_FAILURE);
}
return NS_OK;
}
void
nsDOMAttributeMap::DropAttribute(int32_t aNamespaceID, nsIAtom* aLocalName)
{
nsAttrKey attr(aNamespaceID, aLocalName);
if (mAttributeCache) {
Attr *node = mAttributeCache->GetWeak(attr);
if (node) {
// Break link to map
node->SetMap(nullptr);
// Remove from cache
mAttributeCache->Remove(attr);
}
}
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveAttribute(mozilla::dom::NodeInfo* aNodeInfo)
{
NS_ASSERTION(aNodeInfo, "RemoveAttribute() called with aNodeInfo == nullptr!");
nsAttrKey attr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom());
nsRefPtr<Attr> node;
if (mAttributeCache && mAttributeCache->Get(attr, getter_AddRefs(node))) {
// Break link to map
node->SetMap(nullptr);
// Remove from cache
mAttributeCache->Remove(attr);
} else {
nsAutoString value;
// As we are removing the attribute we need to set the current value in
// the attribute node.
mContent->GetAttr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom(), value);
nsRefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
node = new Attr(nullptr, ni.forget(), value, true);
}
return node.forget();
}
Attr*
nsDOMAttributeMap::GetAttribute(mozilla::dom::NodeInfo* aNodeInfo, bool aNsAware)
{
NS_ASSERTION(aNodeInfo, "GetAttribute() called with aNodeInfo == nullptr!");
nsAttrKey attr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom());
EnsureAttributeCache();
Attr* node = mAttributeCache->GetWeak(attr);
if (!node) {
nsRefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
nsRefPtr<Attr> newAttr =
new Attr(this, ni.forget(), EmptyString(), aNsAware);
mAttributeCache->Put(attr, newAttr);
node = newAttr;
}
return node;
}
Attr*
nsDOMAttributeMap::NamedGetter(const nsAString& aAttrName, bool& aFound)
{
aFound = false;
NS_ENSURE_TRUE(mContent, nullptr);
nsRefPtr<mozilla::dom::NodeInfo> ni = mContent->GetExistingAttrNameFromQName(aAttrName);
if (!ni) {
return nullptr;
}
aFound = true;
return GetAttribute(ni, false);
}
bool
nsDOMAttributeMap::NameIsEnumerable(const nsAString& aName)
{
return true;
}
Attr*
nsDOMAttributeMap::GetNamedItem(const nsAString& aAttrName)
{
bool dummy;
return NamedGetter(aAttrName, dummy);
}
NS_IMETHODIMP
nsDOMAttributeMap::GetNamedItem(const nsAString& aAttrName,
nsIDOMAttr** aAttribute)
{
NS_ENSURE_ARG_POINTER(aAttribute);
NS_IF_ADDREF(*aAttribute = GetNamedItem(aAttrName));
return NS_OK;
}
void
nsDOMAttributeMap::EnsureAttributeCache()
{
if (!mAttributeCache) {
mAttributeCache = MakeUnique<AttrCache>();
}
}
NS_IMETHODIMP
nsDOMAttributeMap::SetNamedItem(nsIDOMAttr* aAttr, nsIDOMAttr** aReturn)
{
Attr* attribute = static_cast<Attr*>(aAttr);
NS_ENSURE_ARG(attribute);
ErrorResult rv;
*aReturn = SetNamedItem(*attribute, rv).take();
return rv.ErrorCode();
}
NS_IMETHODIMP
nsDOMAttributeMap::SetNamedItemNS(nsIDOMAttr* aAttr, nsIDOMAttr** aReturn)
{
Attr* attribute = static_cast<Attr*>(aAttr);
NS_ENSURE_ARG(attribute);
ErrorResult rv;
*aReturn = SetNamedItemNS(*attribute, rv).take();
return rv.ErrorCode();
}
already_AddRefed<Attr>
nsDOMAttributeMap::SetNamedItemInternal(Attr& aAttr,
bool aWithNS,
ErrorResult& aError)
{
NS_ENSURE_TRUE(mContent, nullptr);
// XXX should check same-origin between mContent and aAttr however
// nsContentUtils::CheckSameOrigin can't deal with attributenodes yet
// Check that attribute is not owned by somebody else
nsDOMAttributeMap* owner = aAttr.GetMap();
if (owner) {
if (owner != this) {
aError.Throw(NS_ERROR_DOM_INUSE_ATTRIBUTE_ERR);
return nullptr;
}
// setting a preexisting attribute is a no-op, just return the same
// node.
nsRefPtr<Attr> attribute = &aAttr;
return attribute.forget();
}
nsresult rv;
if (mContent->OwnerDoc() != aAttr.OwnerDoc()) {
nsCOMPtr<nsINode> adoptedNode =
mContent->OwnerDoc()->AdoptNode(aAttr, aError);
if (aError.Failed()) {
return nullptr;
}
NS_ASSERTION(adoptedNode == &aAttr, "Uh, adopt node changed nodes?");
}
// Get nodeinfo and preexisting attribute (if it exists)
nsAutoString name;
nsRefPtr<mozilla::dom::NodeInfo> ni;
nsRefPtr<Attr> attr;
// SetNamedItemNS()
if (aWithNS) {
// Return existing attribute, if present
ni = aAttr.NodeInfo();
if (mContent->HasAttr(ni->NamespaceID(), ni->NameAtom())) {
attr = RemoveAttribute(ni);
}
} else { // SetNamedItem()
aAttr.GetName(name);
// get node-info of old attribute
ni = mContent->GetExistingAttrNameFromQName(name);
if (ni) {
attr = RemoveAttribute(ni);
}
else {
if (mContent->IsInHTMLDocument() &&
mContent->IsHTML()) {
nsContentUtils::ASCIIToLower(name);
}
rv = mContent->NodeInfo()->NodeInfoManager()->
GetNodeInfo(name, nullptr, kNameSpaceID_None,
nsIDOMNode::ATTRIBUTE_NODE, getter_AddRefs(ni));
if (NS_FAILED(rv)) {
aError.Throw(rv);
return nullptr;
}
// value is already empty
}
}
nsAutoString value;
aAttr.GetValue(value);
// Add the new attribute to the attribute map before updating
// its value in the element. @see bug 364413.
nsAttrKey attrkey(ni->NamespaceID(), ni->NameAtom());
EnsureAttributeCache();
mAttributeCache->Put(attrkey, &aAttr);
aAttr.SetMap(this);
rv = mContent->SetAttr(ni->NamespaceID(), ni->NameAtom(),
ni->GetPrefixAtom(), value, true);
if (NS_FAILED(rv)) {
aError.Throw(rv);
DropAttribute(ni->NamespaceID(), ni->NameAtom());
}
return attr.forget();
}
NS_IMETHODIMP
nsDOMAttributeMap::RemoveNamedItem(const nsAString& aName,
nsIDOMAttr** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
ErrorResult rv;
*aReturn = RemoveNamedItem(aName, rv).take();
return rv.ErrorCode();
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveNamedItem(const nsAString& aName, ErrorResult& aError)
{
if (!mContent) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
nsRefPtr<mozilla::dom::NodeInfo> ni = mContent->GetExistingAttrNameFromQName(aName);
if (!ni) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
nsRefPtr<Attr> attribute = GetAttribute(ni, true);
// This removes the attribute node from the attribute map.
aError = mContent->UnsetAttr(ni->NamespaceID(), ni->NameAtom(), true);
return attribute.forget();
}
Attr*
nsDOMAttributeMap::IndexedGetter(uint32_t aIndex, bool& aFound)
{
aFound = false;
NS_ENSURE_TRUE(mContent, nullptr);
const nsAttrName* name = mContent->GetAttrNameAt(aIndex);
NS_ENSURE_TRUE(name, nullptr);
aFound = true;
// Don't use the nodeinfo even if one exists since it can have the wrong
// owner document.
nsRefPtr<mozilla::dom::NodeInfo> ni = mContent->NodeInfo()->NodeInfoManager()->
GetNodeInfo(name->LocalName(), name->GetPrefix(), name->NamespaceID(),
nsIDOMNode::ATTRIBUTE_NODE);
return GetAttribute(ni, true);
}
Attr*
nsDOMAttributeMap::Item(uint32_t aIndex)
{
bool dummy;
return IndexedGetter(aIndex, dummy);
}
NS_IMETHODIMP
nsDOMAttributeMap::Item(uint32_t aIndex, nsIDOMAttr** aReturn)
{
NS_IF_ADDREF(*aReturn = Item(aIndex));
return NS_OK;
}
uint32_t
nsDOMAttributeMap::Length() const
{
NS_ENSURE_TRUE(mContent, 0);
return mContent->GetAttrCount();
}
nsresult
nsDOMAttributeMap::GetLength(uint32_t *aLength)
{
NS_ENSURE_ARG_POINTER(aLength);
*aLength = Length();
return NS_OK;
}
NS_IMETHODIMP
nsDOMAttributeMap::GetNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName,
nsIDOMAttr** aReturn)
{
NS_IF_ADDREF(*aReturn = GetNamedItemNS(aNamespaceURI, aLocalName));
return NS_OK;
}
Attr*
nsDOMAttributeMap::GetNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName)
{
nsRefPtr<mozilla::dom::NodeInfo> ni = GetAttrNodeInfo(aNamespaceURI, aLocalName);
if (!ni) {
return nullptr;
}
return GetAttribute(ni, true);
}
already_AddRefed<mozilla::dom::NodeInfo>
nsDOMAttributeMap::GetAttrNodeInfo(const nsAString& aNamespaceURI,
const nsAString& aLocalName)
{
if (!mContent) {
return nullptr;
}
int32_t nameSpaceID = kNameSpaceID_None;
if (!aNamespaceURI.IsEmpty()) {
nameSpaceID =
nsContentUtils::NameSpaceManager()->GetNameSpaceID(aNamespaceURI);
if (nameSpaceID == kNameSpaceID_Unknown) {
return nullptr;
}
}
uint32_t i, count = mContent->GetAttrCount();
for (i = 0; i < count; ++i) {
const nsAttrName* name = mContent->GetAttrNameAt(i);
int32_t attrNS = name->NamespaceID();
nsIAtom* nameAtom = name->LocalName();
if (nameSpaceID == attrNS &&
nameAtom->Equals(aLocalName)) {
nsRefPtr<mozilla::dom::NodeInfo> ni;
ni = mContent->NodeInfo()->NodeInfoManager()->
GetNodeInfo(nameAtom, name->GetPrefix(), nameSpaceID,
nsIDOMNode::ATTRIBUTE_NODE);
return ni.forget();
}
}
return nullptr;
}
NS_IMETHODIMP
nsDOMAttributeMap::RemoveNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName,
nsIDOMAttr** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
ErrorResult rv;
*aReturn = RemoveNamedItemNS(aNamespaceURI, aLocalName, rv).take();
return rv.ErrorCode();
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName,
ErrorResult& aError)
{
nsRefPtr<mozilla::dom::NodeInfo> ni = GetAttrNodeInfo(aNamespaceURI, aLocalName);
if (!ni) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
nsRefPtr<Attr> attr = RemoveAttribute(ni);
mozilla::dom::NodeInfo* attrNi = attr->NodeInfo();
mContent->UnsetAttr(attrNi->NamespaceID(), attrNi->NameAtom(), true);
return attr.forget();
}
uint32_t
nsDOMAttributeMap::Count() const
{
return mAttributeCache ? mAttributeCache->Count() : 0;
}
uint32_t
nsDOMAttributeMap::Enumerate(AttrCache::EnumReadFunction aFunc,
void *aUserArg) const
{
return mAttributeCache ? mAttributeCache->EnumerateRead(aFunc, aUserArg) : 0;
}
size_t
AttrCacheSizeEnumerator(const nsAttrKey& aKey,
const nsRefPtr<Attr>& aValue,
MallocSizeOf aMallocSizeOf,
void* aUserArg)
{
return aMallocSizeOf(aValue.get());
}
size_t
nsDOMAttributeMap::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mAttributeCache
? mAttributeCache->SizeOfExcludingThis(AttrCacheSizeEnumerator,
aMallocSizeOf)
: 0;
// NB: mContent is non-owning and thus not counted.
return n;
}
/* virtual */ JSObject*
nsDOMAttributeMap::WrapObject(JSContext* aCx)
{
return NamedNodeMapBinding::Wrap(aCx, this);
}