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 "mozilla/dom/NodeInfoInlines.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
}
nsDOMAttributeMap::~nsDOMAttributeMap()
{
DropReference();
}
void
nsDOMAttributeMap::DropReference()
{
for (auto iter = mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
iter.Data()->SetMap(nullptr);
iter.Remove();
}
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
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMAttributeMap)
for (auto iter = tmp->mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
cb.NoteXPCOMChild(static_cast<nsINode*>(iter.Data().get()));
}
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->HasKnownLiveWrapper()) {
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->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMAttributeMap)
return tmp->HasKnownLiveWrapper();
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)
nsresult
nsDOMAttributeMap::SetOwnerDocument(nsIDocument* aDocument)
{
for (auto iter = mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
nsresult rv = iter.Data()->SetOwnerDocument(aDocument);
NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
}
return NS_OK;
}
void
nsDOMAttributeMap::DropAttribute(int32_t aNamespaceID, nsIAtom* aLocalName)
{
nsAttrKey attr(aNamespaceID, aLocalName);
Attr *node = mAttributeCache.GetWeak(attr);
if (node) {
// Break link to map
node->SetMap(nullptr);
// Remove from cache
mAttributeCache.Remove(attr);
}
}
Attr*
nsDOMAttributeMap::GetAttribute(mozilla::dom::NodeInfo* aNodeInfo)
{
NS_ASSERTION(aNodeInfo, "GetAttribute() called with aNodeInfo == nullptr!");
nsAttrKey attr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom());
Attr* node = mAttributeCache.GetWeak(attr);
if (!node) {
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
RefPtr<Attr> newAttr =
new Attr(this, ni.forget(), EmptyString());
mAttributeCache.Put(attr, newAttr);
node = newAttr;
}
return node;
}
Attr*
nsDOMAttributeMap::NamedGetter(const nsAString& aAttrName, bool& aFound)
{
aFound = false;
NS_ENSURE_TRUE(mContent, nullptr);
RefPtr<mozilla::dom::NodeInfo> ni = mContent->GetExistingAttrNameFromQName(aAttrName);
if (!ni) {
return nullptr;
}
aFound = true;
return GetAttribute(ni);
}
void
nsDOMAttributeMap::GetSupportedNames(nsTArray<nsString>& aNames)
{
// For HTML elements in HTML documents, only include names that are still the
// same after ASCII-lowercasing, since our named getter will end up
// ASCII-lowercasing the given string.
bool lowercaseNamesOnly =
mContent->IsHTMLElement() && mContent->IsInHTMLDocument();
const uint32_t count = mContent->GetAttrCount();
bool seenNonAtomName = false;
for (uint32_t i = 0; i < count; i++) {
const nsAttrName* name = mContent->GetAttrNameAt(i);
seenNonAtomName = seenNonAtomName || !name->IsAtom();
nsString qualifiedName;
name->GetQualifiedName(qualifiedName);
if (lowercaseNamesOnly &&
nsContentUtils::StringContainsASCIIUpper(qualifiedName)) {
continue;
}
// Omit duplicates. We only need to do this check if we've seen a non-atom
// name, because that's the only way we can have two identical qualified
// names.
if (seenNonAtomName && aNames.Contains(qualifiedName)) {
continue;
}
aNames.AppendElement(qualifiedName);
}
}
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;
}
NS_IMETHODIMP
nsDOMAttributeMap::SetNamedItem(nsIDOMAttr* aAttr, nsIDOMAttr** aReturn)
{
Attr* attribute = static_cast<Attr*>(aAttr);
NS_ENSURE_ARG(attribute);
ErrorResult rv;
*aReturn = SetNamedItemNS(*attribute, rv).take();
return rv.StealNSResult();
}
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.StealNSResult();
}
already_AddRefed<Attr>
nsDOMAttributeMap::SetNamedItemNS(Attr& aAttr, 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.
RefPtr<Attr> attribute = &aAttr;
return attribute.forget();
}
nsresult rv;
if (mContent->OwnerDoc() != aAttr.OwnerDoc()) {
DebugOnly<void*> 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)
RefPtr<NodeInfo> oldNi;
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();
// we're purposefully ignoring the prefix.
if (aAttr.NodeInfo()->Equals(nameAtom, attrNS)) {
oldNi = mContent->NodeInfo()->NodeInfoManager()->
GetNodeInfo(nameAtom, name->GetPrefix(), aAttr.NodeInfo()->NamespaceID(),
nsIDOMNode::ATTRIBUTE_NODE);
break;
}
}
RefPtr<Attr> oldAttr;
if (oldNi) {
oldAttr = GetAttribute(oldNi);
if (oldAttr == &aAttr) {
return oldAttr.forget();
}
if (oldAttr) {
// Just remove it from our hashtable. This has no side-effects, so we
// don't have to recheck anything after we do it. Then we'll add our new
// Attr to the hashtable and do the actual attr set on the element. This
// will make the whole thing look like a single attribute mutation (with
// the new attr node in place) as opposed to a removal and addition.
DropAttribute(oldNi->NamespaceID(), oldNi->NameAtom());
}
}
nsAutoString value;
aAttr.GetValue(value);
RefPtr<NodeInfo> ni = aAttr.NodeInfo();
// Add the new attribute to the attribute map before updating
// its value in the element. @see bug 364413.
nsAttrKey attrkey(ni->NamespaceID(), ni->NameAtom());
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 oldAttr.forget();
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveNamedItem(NodeInfo* aNodeInfo, ErrorResult& aError)
{
RefPtr<Attr> attribute = GetAttribute(aNodeInfo);
// This removes the attribute node from the attribute map.
aError = mContent->UnsetAttr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom(), true);
return attribute.forget();
}
NS_IMETHODIMP
nsDOMAttributeMap::RemoveNamedItem(const nsAString& aName,
nsIDOMAttr** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
ErrorResult rv;
*aReturn = RemoveNamedItem(aName, rv).take();
return rv.StealNSResult();
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveNamedItem(const nsAString& aName, ErrorResult& aError)
{
if (!mContent) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
RefPtr<mozilla::dom::NodeInfo> ni = mContent->GetExistingAttrNameFromQName(aName);
if (!ni) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
return RemoveNamedItem(ni, aError);
}
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.
RefPtr<mozilla::dom::NodeInfo> ni = mContent->NodeInfo()->NodeInfoManager()->
GetNodeInfo(name->LocalName(), name->GetPrefix(), name->NamespaceID(),
nsIDOMNode::ATTRIBUTE_NODE);
return GetAttribute(ni);
}
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)
{
RefPtr<mozilla::dom::NodeInfo> ni = GetAttrNodeInfo(aNamespaceURI, aLocalName);
if (!ni) {
return nullptr;
}
return GetAttribute(ni);
}
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,
nsContentUtils::IsChromeDoc(mContent->OwnerDoc()));
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();
// we're purposefully ignoring the prefix.
if (nameSpaceID == attrNS &&
nameAtom->Equals(aLocalName)) {
RefPtr<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.StealNSResult();
}
already_AddRefed<Attr>
nsDOMAttributeMap::RemoveNamedItemNS(const nsAString& aNamespaceURI,
const nsAString& aLocalName,
ErrorResult& aError)
{
RefPtr<mozilla::dom::NodeInfo> ni = GetAttrNodeInfo(aNamespaceURI, aLocalName);
if (!ni) {
aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return nullptr;
}
return RemoveNamedItem(ni, aError);
}
uint32_t
nsDOMAttributeMap::Count() const
{
return mAttributeCache.Count();
}
size_t
nsDOMAttributeMap::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mAttributeCache.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (auto iter = mAttributeCache.ConstIter(); !iter.Done(); iter.Next()) {
n += aMallocSizeOf(iter.Data().get());
}
// NB: mContent is non-owning and thus not counted.
return n;
}
/* virtual */ JSObject*
nsDOMAttributeMap::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return NamedNodeMapBinding::Wrap(aCx, this, aGivenProto);
}