gecko-dev/dom/xslt/xpath/XPathResult.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "XPathResult.h"
#include "txExprResult.h"
#include "txNodeSet.h"
#include "nsError.h"
#include "mozilla/dom/Attr.h"
#include "mozilla/dom/Element.h"
#include "nsDOMClassInfoID.h"
#include "nsIDOMNode.h"
#include "nsIDOMDocument.h"
#include "nsDOMString.h"
#include "txXPathTreeWalker.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/dom/XPathResultBinding.h"
namespace mozilla {
namespace dom {
XPathResult::XPathResult(nsINode* aParent)
: mParent(aParent),
mDocument(nullptr),
mCurrentPos(0),
mResultType(ANY_TYPE),
mInvalidIteratorState(true),
mBooleanResult(false),
mNumberResult(0)
{
}
XPathResult::XPathResult(const XPathResult &aResult)
: mParent(aResult.mParent),
mResult(aResult.mResult),
mResultNodes(aResult.mResultNodes),
mDocument(aResult.mDocument),
mContextNode(aResult.mContextNode),
mCurrentPos(0),
mResultType(aResult.mResultType),
mInvalidIteratorState(aResult.mInvalidIteratorState)
{
if (mDocument) {
mDocument->AddMutationObserver(this);
}
}
XPathResult::~XPathResult()
{
RemoveObserver();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(XPathResult)
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(XPathResult)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(XPathResult)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
{
tmp->RemoveObserver();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(XPathResult)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResultNodes)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(XPathResult)
NS_IMPL_CYCLE_COLLECTING_RELEASE(XPathResult)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XPathResult)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY(nsIXPathResult)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIXPathResult)
NS_INTERFACE_MAP_END
JSObject*
XPathResult::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return XPathResultBinding::Wrap(aCx, this, aGivenProto);
}
void
XPathResult::RemoveObserver()
{
if (mDocument) {
mDocument->RemoveMutationObserver(this);
}
}
nsINode*
XPathResult::IterateNext(ErrorResult& aRv)
{
if (!isIterator()) {
aRv.Throw(NS_ERROR_DOM_TYPE_ERR);
return nullptr;
}
if (mDocument) {
mDocument->FlushPendingNotifications(FlushType::Content);
}
if (mInvalidIteratorState) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
return mResultNodes.SafeObjectAt(mCurrentPos++);
}
void
XPathResult::NodeWillBeDestroyed(const nsINode* aNode)
{
nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
// Set to null to avoid unregistring unnecessarily
mDocument = nullptr;
Invalidate(aNode->IsNodeOfType(nsINode::eCONTENT) ?
static_cast<const nsIContent*>(aNode) : nullptr);
}
void
XPathResult::CharacterDataChanged(nsIDocument* aDocument,
nsIContent *aContent,
CharacterDataChangeInfo* aInfo)
{
Invalidate(aContent);
}
void
XPathResult::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
Invalidate(aElement);
}
void
XPathResult::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
Invalidate(aContainer);
}
void
XPathResult::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
Invalidate(aContainer);
}
void
XPathResult::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
Invalidate(aContainer);
}
nsresult
XPathResult::SetExprResult(txAExprResult* aExprResult, uint16_t aResultType,
nsINode* aContextNode)
{
MOZ_ASSERT(aExprResult);
if ((isSnapshot(aResultType) || isIterator(aResultType) ||
isNode(aResultType)) &&
aExprResult->getResultType() != txAExprResult::NODESET) {
// The DOM spec doesn't really say what should happen when reusing an
// XPathResult and an error is thrown. Let's not touch the XPathResult
// in that case.
return NS_ERROR_DOM_TYPE_ERR;
}
mResultType = aResultType;
mContextNode = do_GetWeakReference(aContextNode);
if (mDocument) {
mDocument->RemoveMutationObserver(this);
mDocument = nullptr;
}
mResultNodes.Clear();
// XXX This will keep the recycler alive, should we clear it?
mResult = aExprResult;
switch (mResultType) {
case BOOLEAN_TYPE:
{
mBooleanResult = mResult->booleanValue();
break;
}
case NUMBER_TYPE:
{
mNumberResult = mResult->numberValue();
break;
}
case STRING_TYPE:
{
mResult->stringValue(mStringResult);
break;
}
default:
{
MOZ_ASSERT(isNode() || isIterator() || isSnapshot());
}
}
if (aExprResult->getResultType() == txAExprResult::NODESET) {
txNodeSet *nodeSet = static_cast<txNodeSet*>(aExprResult);
int32_t i, count = nodeSet->size();
for (i = 0; i < count; ++i) {
nsINode* node = txXPathNativeNode::getNode(nodeSet->get(i));
mResultNodes.AppendObject(node);
}
if (count > 0) {
mResult = nullptr;
}
}
if (!isIterator()) {
return NS_OK;
}
mInvalidIteratorState = false;
if (mResultNodes.Count() > 0) {
// If we support the document() function in DOM-XPath we need to
// observe all documents that we have resultnodes in.
mDocument = mResultNodes[0]->OwnerDoc();
NS_ASSERTION(mDocument, "We need a document!");
if (mDocument) {
mDocument->AddMutationObserver(this);
}
}
return NS_OK;
}
void
XPathResult::Invalidate(const nsIContent* aChangeRoot)
{
nsCOMPtr<nsINode> contextNode = do_QueryReferent(mContextNode);
if (contextNode && aChangeRoot && aChangeRoot->GetBindingParent()) {
// If context node is in anonymous content, changes to
// non-anonymous content need to invalidate the XPathResult. If
// the changes are happening in a different anonymous trees, no
// invalidation should happen.
nsIContent* ctxBindingParent = nullptr;
if (contextNode->IsNodeOfType(nsINode::eCONTENT)) {
ctxBindingParent =
static_cast<nsIContent*>(contextNode.get())
->GetBindingParent();
} else if (contextNode->IsNodeOfType(nsINode::eATTRIBUTE)) {
Element* parent =
static_cast<Attr*>(contextNode.get())->GetElement();
if (parent) {
ctxBindingParent = parent->GetBindingParent();
}
}
if (ctxBindingParent != aChangeRoot->GetBindingParent()) {
return;
}
}
mInvalidIteratorState = true;
// Make sure nulling out mDocument is the last thing we do.
if (mDocument) {
mDocument->RemoveMutationObserver(this);
mDocument = nullptr;
}
}
nsresult
XPathResult::GetExprResult(txAExprResult** aExprResult)
{
if (isIterator() && mInvalidIteratorState) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
if (mResult) {
NS_ADDREF(*aExprResult = mResult);
return NS_OK;
}
if (mResultNodes.Count() == 0) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
RefPtr<txNodeSet> nodeSet = new txNodeSet(nullptr);
if (!nodeSet) {
return NS_ERROR_OUT_OF_MEMORY;
}
uint32_t i, count = mResultNodes.Count();
for (i = 0; i < count; ++i) {
nsAutoPtr<txXPathNode> node(txXPathNativeNode::createXPathNode(mResultNodes[i]));
if (!node) {
return NS_ERROR_OUT_OF_MEMORY;
}
nodeSet->append(*node);
}
NS_ADDREF(*aExprResult = nodeSet);
return NS_OK;
}
nsresult
XPathResult::Clone(nsIXPathResult **aResult)
{
*aResult = nullptr;
if (isIterator() && mInvalidIteratorState) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
NS_ADDREF(*aResult = new XPathResult(*this));
return NS_OK;
}
} // namespace dom
} // namespace mozilla