gecko-dev/dom/base/Attr.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 DOM Core's nsIDOMAttr node.
*/
#include "mozilla/dom/Attr.h"
#include "mozilla/dom/AttrBinding.h"
#include "mozilla/dom/Element.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/InternalMutationEvent.h"
#include "nsContentCreatorFunctions.h"
#include "nsError.h"
#include "nsUnicharUtils.h"
#include "nsDOMString.h"
#include "nsIContentInlines.h"
#include "nsIDocument.h"
#include "nsGkAtoms.h"
#include "nsCOMArray.h"
#include "nsNameSpaceManager.h"
#include "nsNodeUtils.h"
#include "nsTextNode.h"
#include "mozAutoDocUpdate.h"
#include "nsWrapperCacheInlines.h"
nsIAttribute::nsIAttribute(nsDOMAttributeMap* aAttrMap,
already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo,
bool aNsAware)
: nsINode(aNodeInfo), mAttrMap(aAttrMap), mNsAware(aNsAware)
{
}
nsIAttribute::~nsIAttribute()
{
}
namespace mozilla {
namespace dom {
//----------------------------------------------------------------------
bool Attr::sInitialized;
Attr::Attr(nsDOMAttributeMap *aAttrMap,
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
const nsAString &aValue, bool aNsAware)
: nsIAttribute(aAttrMap, aNodeInfo, aNsAware), mValue(aValue)
{
MOZ_ASSERT(mNodeInfo, "We must get a nodeinfo here!");
MOZ_ASSERT(mNodeInfo->NodeType() == nsIDOMNode::ATTRIBUTE_NODE,
"Wrong nodeType");
// We don't add a reference to our content. It will tell us
// to drop our reference when it goes away.
}
NS_IMPL_CYCLE_COLLECTION_CLASS(Attr)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Attr)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
if (!nsINode::Traverse(tmp, cb)) {
return NS_SUCCESS_INTERRUPTED_TRAVERSE;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAttrMap)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(Attr)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Attr)
nsINode::Unlink(tmp);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAttrMap)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(Attr)
Element* ownerElement = tmp->GetElement();
if (tmp->IsBlack()) {
if (ownerElement) {
// The attribute owns the element via attribute map so we can
// mark it when the attribute is certainly alive.
mozilla::dom::FragmentOrElement::MarkNodeChildren(ownerElement);
}
return true;
}
if (ownerElement &&
mozilla::dom::FragmentOrElement::CanSkip(ownerElement, true)) {
return true;
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(Attr)
return tmp->IsBlackAndDoesNotNeedTracing(static_cast<nsIAttribute*>(tmp));
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(Attr)
return tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
// QueryInterface implementation for Attr
NS_INTERFACE_TABLE_HEAD(Attr)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(Attr, nsINode, nsIDOMAttr, nsIAttribute, nsIDOMNode,
nsIDOMEventTarget, EventTarget)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(Attr)
NS_INTERFACE_MAP_ENTRY_TEAROFF(nsISupportsWeakReference,
new nsNodeSupportsWeakRefTearoff(this))
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(Attr)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(Attr,
nsNodeUtils::LastRelease(this))
void
Attr::SetMap(nsDOMAttributeMap *aMap)
{
if (mAttrMap && !aMap && sInitialized) {
// We're breaking a relationship with content and not getting a new one,
// need to locally cache value. GetValue() does that.
GetValue(mValue);
}
mAttrMap = aMap;
}
Element*
Attr::GetElement() const
{
if (!mAttrMap) {
return nullptr;
}
nsIContent* content = mAttrMap->GetContent();
return content ? content->AsElement() : nullptr;
}
nsresult
Attr::SetOwnerDocument(nsIDocument* aDocument)
{
NS_ASSERTION(aDocument, "Missing document");
nsIDocument *doc = OwnerDoc();
NS_ASSERTION(doc != aDocument, "bad call to Attr::SetOwnerDocument");
doc->DeleteAllPropertiesFor(this);
RefPtr<mozilla::dom::NodeInfo> newNodeInfo;
newNodeInfo = aDocument->NodeInfoManager()->
GetNodeInfo(mNodeInfo->NameAtom(), mNodeInfo->GetPrefixAtom(),
mNodeInfo->NamespaceID(),
nsIDOMNode::ATTRIBUTE_NODE);
NS_ASSERTION(newNodeInfo, "GetNodeInfo lies");
mNodeInfo.swap(newNodeInfo);
return NS_OK;
}
NS_IMETHODIMP
Attr::GetName(nsAString& aName)
{
aName = NodeName();
return NS_OK;
}
NS_IMETHODIMP
Attr::GetValue(nsAString& aValue)
{
Element* element = GetElement();
if (element) {
nsCOMPtr<nsIAtom> nameAtom = mNodeInfo->NameAtom();
element->GetAttr(mNodeInfo->NamespaceID(), nameAtom, aValue);
}
else {
aValue = mValue;
}
return NS_OK;
}
void
Attr::SetValue(const nsAString& aValue, ErrorResult& aRv)
{
Element* element = GetElement();
if (!element) {
mValue = aValue;
return;
}
nsCOMPtr<nsIAtom> nameAtom = mNodeInfo->NameAtom();
aRv = element->SetAttr(mNodeInfo->NamespaceID(),
nameAtom,
mNodeInfo->GetPrefixAtom(),
aValue,
true);
}
NS_IMETHODIMP
Attr::SetValue(const nsAString& aValue)
{
ErrorResult rv;
SetValue(aValue, rv);
return rv.StealNSResult();
}
bool
Attr::Specified() const
{
return true;
}
NS_IMETHODIMP
Attr::GetSpecified(bool* aSpecified)
{
NS_ENSURE_ARG_POINTER(aSpecified);
*aSpecified = Specified();
return NS_OK;
}
Element*
Attr::GetOwnerElement(ErrorResult& aRv)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eOwnerElement);
return GetElement();
}
NS_IMETHODIMP
Attr::GetOwnerElement(nsIDOMElement** aOwnerElement)
{
NS_ENSURE_ARG_POINTER(aOwnerElement);
OwnerDoc()->WarnOnceAbout(nsIDocument::eOwnerElement);
Element* element = GetElement();
if (element) {
return CallQueryInterface(element, aOwnerElement);
}
*aOwnerElement = nullptr;
return NS_OK;
}
void
Attr::GetNodeValueInternal(nsAString& aNodeValue)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eNodeValue);
GetValue(aNodeValue);
}
void
Attr::SetNodeValueInternal(const nsAString& aNodeValue, ErrorResult& aError)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eNodeValue);
aError = SetValue(aNodeValue);
}
nsresult
Attr::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const
{
nsAutoString value;
const_cast<Attr*>(this)->GetValue(value);
RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
*aResult = new Attr(nullptr, ni.forget(), value, mNsAware);
if (!*aResult) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(*aResult);
return NS_OK;
}
already_AddRefed<nsIURI>
Attr::GetBaseURI(bool aTryUseXHRDocBaseURI) const
{
Element* parent = GetElement();
return parent ? parent->GetBaseURI(aTryUseXHRDocBaseURI) : nullptr;
}
void
Attr::GetTextContentInternal(nsAString& aTextContent,
ErrorResult& aError)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eTextContent);
GetValue(aTextContent);
}
void
Attr::SetTextContentInternal(const nsAString& aTextContent,
ErrorResult& aError)
{
OwnerDoc()->WarnOnceAbout(nsIDocument::eTextContent);
SetNodeValueInternal(aTextContent, aError);
}
NS_IMETHODIMP
Attr::GetIsId(bool* aReturn)
{
*aReturn = mNodeInfo->Equals(nsGkAtoms::id, kNameSpaceID_None);
return NS_OK;
}
bool
Attr::IsNodeOfType(uint32_t aFlags) const
{
return !(aFlags & ~eATTRIBUTE);
}
uint32_t
Attr::GetChildCount() const
{
return 0;
}
nsIContent *
Attr::GetChildAt(uint32_t aIndex) const
{
return nullptr;
}
nsIContent * const *
Attr::GetChildArray(uint32_t* aChildCount) const
{
*aChildCount = 0;
return nullptr;
}
int32_t
Attr::IndexOf(const nsINode* aPossibleChild) const
{
return -1;
}
nsresult
Attr::InsertChildAt(nsIContent* aKid, uint32_t aIndex,
bool aNotify)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
void
Attr::RemoveChildAt(uint32_t aIndex, bool aNotify)
{
}
nsresult
Attr::PreHandleEvent(EventChainPreVisitor& aVisitor)
{
aVisitor.mCanHandle = true;
return NS_OK;
}
void
Attr::Initialize()
{
sInitialized = true;
}
void
Attr::Shutdown()
{
sInitialized = false;
}
JSObject*
Attr::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return AttrBinding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla