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gecko-dev/dom/base/nsContentList.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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/. */
/*
* nsBaseContentList is a basic list of content nodes; nsContentList
* is a commonly used NodeList implementation (used for
* getElementsByTagName, some properties on nsIDOMHTMLDocument, etc).
*/
#include "nsContentList.h"
#include "nsIContent.h"
#include "nsIDOMNode.h"
#include "nsIDocument.h"
#include "mozilla/dom/Element.h"
#include "nsWrapperCacheInlines.h"
#include "nsContentUtils.h"
#include "nsCCUncollectableMarker.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/HTMLCollectionBinding.h"
#include "mozilla/dom/NodeListBinding.h"
#include "mozilla/Likely.h"
#include "nsGenericHTMLElement.h"
#include "jsfriendapi.h"
#include <algorithm>
#include "mozilla/dom/NodeInfoInlines.h"
// Form related includes
#include "nsIDOMHTMLFormElement.h"
#include "pldhash.h"
#ifdef DEBUG_CONTENT_LIST
#include "nsIContentIterator.h"
#define ASSERT_IN_SYNC AssertInSync()
#else
#define ASSERT_IN_SYNC PR_BEGIN_MACRO PR_END_MACRO
#endif
using namespace mozilla;
using namespace mozilla::dom;
nsBaseContentList::~nsBaseContentList()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsBaseContentList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsBaseContentList)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mElements)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
tmp->RemoveFromCaches();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsBaseContentList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElements)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsBaseContentList)
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsBaseContentList)
if (nsCCUncollectableMarker::sGeneration && tmp->IsBlack()) {
for (uint32_t i = 0; i < tmp->mElements.Length(); ++i) {
nsIContent* c = tmp->mElements[i];
if (c->IsPurple()) {
c->RemovePurple();
}
Element::MarkNodeChildren(c);
}
return true;
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsBaseContentList)
return nsCCUncollectableMarker::sGeneration && tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsBaseContentList)
return nsCCUncollectableMarker::sGeneration && tmp->IsBlack();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
#define NS_CONTENT_LIST_INTERFACES(_class) \
NS_INTERFACE_TABLE_ENTRY(_class, nsINodeList) \
NS_INTERFACE_TABLE_ENTRY(_class, nsIDOMNodeList)
// QueryInterface implementation for nsBaseContentList
NS_INTERFACE_TABLE_HEAD(nsBaseContentList)
NS_WRAPPERCACHE_INTERFACE_TABLE_ENTRY
NS_INTERFACE_TABLE(nsBaseContentList, nsINodeList, nsIDOMNodeList)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsBaseContentList)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsBaseContentList)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsBaseContentList)
NS_IMETHODIMP
nsBaseContentList::GetLength(uint32_t* aLength)
{
*aLength = mElements.Length();
return NS_OK;
}
NS_IMETHODIMP
nsBaseContentList::Item(uint32_t aIndex, nsIDOMNode** aReturn)
{
nsISupports *tmp = Item(aIndex);
if (!tmp) {
*aReturn = nullptr;
return NS_OK;
}
return CallQueryInterface(tmp, aReturn);
}
nsIContent*
nsBaseContentList::Item(uint32_t aIndex)
{
return mElements.SafeElementAt(aIndex);
}
int32_t
nsBaseContentList::IndexOf(nsIContent *aContent, bool aDoFlush)
{
return mElements.IndexOf(aContent);
}
int32_t
nsBaseContentList::IndexOf(nsIContent* aContent)
{
return IndexOf(aContent, true);
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(nsSimpleContentList, nsBaseContentList,
mRoot)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(nsSimpleContentList)
NS_INTERFACE_MAP_END_INHERITING(nsBaseContentList)
NS_IMPL_ADDREF_INHERITED(nsSimpleContentList, nsBaseContentList)
NS_IMPL_RELEASE_INHERITED(nsSimpleContentList, nsBaseContentList)
JSObject*
nsSimpleContentList::WrapObject(JSContext *cx)
{
return NodeListBinding::Wrap(cx, this);
}
// Hashtable for storing nsContentLists
static PLDHashTable gContentListHashTable;
#define RECENTLY_USED_CONTENT_LIST_CACHE_SIZE 31
static nsContentList*
sRecentlyUsedContentLists[RECENTLY_USED_CONTENT_LIST_CACHE_SIZE] = {};
static MOZ_ALWAYS_INLINE uint32_t
RecentlyUsedCacheIndex(const nsContentListKey& aKey)
{
return aKey.GetHash() % RECENTLY_USED_CONTENT_LIST_CACHE_SIZE;
}
struct ContentListHashEntry : public PLDHashEntryHdr
{
nsContentList* mContentList;
};
static PLDHashNumber
ContentListHashtableHashKey(PLDHashTable *table, const void *key)
{
const nsContentListKey* list = static_cast<const nsContentListKey *>(key);
return list->GetHash();
}
static bool
ContentListHashtableMatchEntry(PLDHashTable *table,
const PLDHashEntryHdr *entry,
const void *key)
{
const ContentListHashEntry *e =
static_cast<const ContentListHashEntry *>(entry);
const nsContentList* list = e->mContentList;
const nsContentListKey* ourKey = static_cast<const nsContentListKey *>(key);
return list->MatchesKey(*ourKey);
}
already_AddRefed<nsContentList>
NS_GetContentList(nsINode* aRootNode,
int32_t aMatchNameSpaceId,
const nsAString& aTagname)
{
NS_ASSERTION(aRootNode, "content list has to have a root");
nsRefPtr<nsContentList> list;
nsContentListKey hashKey(aRootNode, aMatchNameSpaceId, aTagname);
uint32_t recentlyUsedCacheIndex = RecentlyUsedCacheIndex(hashKey);
nsContentList* cachedList = sRecentlyUsedContentLists[recentlyUsedCacheIndex];
if (cachedList && cachedList->MatchesKey(hashKey)) {
list = cachedList;
return list.forget();
}
static const PLDHashTableOps hash_table_ops =
{
ContentListHashtableHashKey,
ContentListHashtableMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub
};
// Initialize the hashtable if needed.
if (!gContentListHashTable.IsInitialized()) {
PL_DHashTableInit(&gContentListHashTable, &hash_table_ops,
sizeof(ContentListHashEntry));
}
ContentListHashEntry *entry = nullptr;
// First we look in our hashtable. Then we create a content list if needed
if (gContentListHashTable.IsInitialized()) {
entry = static_cast<ContentListHashEntry *>
(PL_DHashTableAdd(&gContentListHashTable, &hashKey));
if (entry)
list = entry->mContentList;
}
if (!list) {
// We need to create a ContentList and add it to our new entry, if
// we have an entry
nsCOMPtr<nsIAtom> xmlAtom = do_GetAtom(aTagname);
nsCOMPtr<nsIAtom> htmlAtom;
if (aMatchNameSpaceId == kNameSpaceID_Unknown) {
nsAutoString lowercaseName;
nsContentUtils::ASCIIToLower(aTagname, lowercaseName);
htmlAtom = do_GetAtom(lowercaseName);
} else {
htmlAtom = xmlAtom;
}
list = new nsContentList(aRootNode, aMatchNameSpaceId, htmlAtom, xmlAtom);
if (entry) {
entry->mContentList = list;
}
}
sRecentlyUsedContentLists[recentlyUsedCacheIndex] = list;
return list.forget();
}
#ifdef DEBUG
const nsCacheableFuncStringContentList::ContentListType
nsCacheableFuncStringNodeList::sType = nsCacheableFuncStringContentList::eNodeList;
const nsCacheableFuncStringContentList::ContentListType
nsCacheableFuncStringHTMLCollection::sType = nsCacheableFuncStringContentList::eHTMLCollection;
#endif
JSObject*
nsCacheableFuncStringNodeList::WrapObject(JSContext *cx)
{
return NodeListBinding::Wrap(cx, this);
}
JSObject*
nsCacheableFuncStringHTMLCollection::WrapObject(JSContext *cx)
{
return HTMLCollectionBinding::Wrap(cx, this);
}
// Hashtable for storing nsCacheableFuncStringContentList
static PLDHashTable gFuncStringContentListHashTable;
struct FuncStringContentListHashEntry : public PLDHashEntryHdr
{
nsCacheableFuncStringContentList* mContentList;
};
static PLDHashNumber
FuncStringContentListHashtableHashKey(PLDHashTable *table, const void *key)
{
const nsFuncStringCacheKey* funcStringKey =
static_cast<const nsFuncStringCacheKey *>(key);
return funcStringKey->GetHash();
}
static bool
FuncStringContentListHashtableMatchEntry(PLDHashTable *table,
const PLDHashEntryHdr *entry,
const void *key)
{
const FuncStringContentListHashEntry *e =
static_cast<const FuncStringContentListHashEntry *>(entry);
const nsFuncStringCacheKey* ourKey =
static_cast<const nsFuncStringCacheKey *>(key);
return e->mContentList->Equals(ourKey);
}
template<class ListType>
already_AddRefed<nsContentList>
GetFuncStringContentList(nsINode* aRootNode,
nsContentListMatchFunc aFunc,
nsContentListDestroyFunc aDestroyFunc,
nsFuncStringContentListDataAllocator aDataAllocator,
const nsAString& aString)
{
NS_ASSERTION(aRootNode, "content list has to have a root");
nsRefPtr<nsCacheableFuncStringContentList> list;
static const PLDHashTableOps hash_table_ops =
{
FuncStringContentListHashtableHashKey,
FuncStringContentListHashtableMatchEntry,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub
};
// Initialize the hashtable if needed.
if (!gFuncStringContentListHashTable.IsInitialized()) {
PL_DHashTableInit(&gFuncStringContentListHashTable, &hash_table_ops,
sizeof(FuncStringContentListHashEntry));
}
FuncStringContentListHashEntry *entry = nullptr;
// First we look in our hashtable. Then we create a content list if needed
if (gFuncStringContentListHashTable.IsInitialized()) {
nsFuncStringCacheKey hashKey(aRootNode, aFunc, aString);
entry = static_cast<FuncStringContentListHashEntry *>
(PL_DHashTableAdd(&gFuncStringContentListHashTable,
&hashKey));
if (entry) {
list = entry->mContentList;
#ifdef DEBUG
MOZ_ASSERT_IF(list, list->mType == ListType::sType);
#endif
}
}
if (!list) {
// We need to create a ContentList and add it to our new entry, if
// we have an entry
list = new ListType(aRootNode, aFunc, aDestroyFunc, aDataAllocator,
aString);
if (entry) {
entry->mContentList = list;
}
}
// Don't cache these lists globally
return list.forget();
}
already_AddRefed<nsContentList>
NS_GetFuncStringNodeList(nsINode* aRootNode,
nsContentListMatchFunc aFunc,
nsContentListDestroyFunc aDestroyFunc,
nsFuncStringContentListDataAllocator aDataAllocator,
const nsAString& aString)
{
return GetFuncStringContentList<nsCacheableFuncStringNodeList>(aRootNode,
aFunc,
aDestroyFunc,
aDataAllocator,
aString);
}
already_AddRefed<nsContentList>
NS_GetFuncStringHTMLCollection(nsINode* aRootNode,
nsContentListMatchFunc aFunc,
nsContentListDestroyFunc aDestroyFunc,
nsFuncStringContentListDataAllocator aDataAllocator,
const nsAString& aString)
{
return GetFuncStringContentList<nsCacheableFuncStringHTMLCollection>(aRootNode,
aFunc,
aDestroyFunc,
aDataAllocator,
aString);
}
// nsContentList implementation
nsContentList::nsContentList(nsINode* aRootNode,
int32_t aMatchNameSpaceId,
nsIAtom* aHTMLMatchAtom,
nsIAtom* aXMLMatchAtom,
bool aDeep)
: nsBaseContentList(),
mRootNode(aRootNode),
mMatchNameSpaceId(aMatchNameSpaceId),
mHTMLMatchAtom(aHTMLMatchAtom),
mXMLMatchAtom(aXMLMatchAtom),
mFunc(nullptr),
mDestroyFunc(nullptr),
mData(nullptr),
mState(LIST_DIRTY),
mDeep(aDeep),
mFuncMayDependOnAttr(false)
{
NS_ASSERTION(mRootNode, "Must have root");
if (nsGkAtoms::_asterix == mHTMLMatchAtom) {
NS_ASSERTION(mXMLMatchAtom == nsGkAtoms::_asterix, "HTML atom and XML atom are not both asterix?");
mMatchAll = true;
}
else {
mMatchAll = false;
}
mRootNode->AddMutationObserver(this);
// We only need to flush if we're in an non-HTML document, since the
// HTML5 parser doesn't need flushing. Further, if we're not in a
// document at all right now (in the GetUncomposedDoc() sense), we're
// not parser-created and don't need to be flushing stuff under us
// to get our kids right.
nsIDocument* doc = mRootNode->GetUncomposedDoc();
mFlushesNeeded = doc && !doc->IsHTML();
}
nsContentList::nsContentList(nsINode* aRootNode,
nsContentListMatchFunc aFunc,
nsContentListDestroyFunc aDestroyFunc,
void* aData,
bool aDeep,
nsIAtom* aMatchAtom,
int32_t aMatchNameSpaceId,
bool aFuncMayDependOnAttr)
: nsBaseContentList(),
mRootNode(aRootNode),
mMatchNameSpaceId(aMatchNameSpaceId),
mHTMLMatchAtom(aMatchAtom),
mXMLMatchAtom(aMatchAtom),
mFunc(aFunc),
mDestroyFunc(aDestroyFunc),
mData(aData),
mState(LIST_DIRTY),
mMatchAll(false),
mDeep(aDeep),
mFuncMayDependOnAttr(aFuncMayDependOnAttr)
{
NS_ASSERTION(mRootNode, "Must have root");
mRootNode->AddMutationObserver(this);
// We only need to flush if we're in an non-HTML document, since the
// HTML5 parser doesn't need flushing. Further, if we're not in a
// document at all right now (in the GetUncomposedDoc() sense), we're
// not parser-created and don't need to be flushing stuff under us
// to get our kids right.
nsIDocument* doc = mRootNode->GetUncomposedDoc();
mFlushesNeeded = doc && !doc->IsHTML();
}
nsContentList::~nsContentList()
{
RemoveFromHashtable();
if (mRootNode) {
mRootNode->RemoveMutationObserver(this);
}
if (mDestroyFunc) {
// Clean up mData
(*mDestroyFunc)(mData);
}
}
JSObject*
nsContentList::WrapObject(JSContext *cx)
{
return HTMLCollectionBinding::Wrap(cx, this);
}
NS_IMPL_ISUPPORTS_INHERITED(nsContentList, nsBaseContentList,
nsIHTMLCollection, nsIDOMHTMLCollection,
nsIMutationObserver)
uint32_t
nsContentList::Length(bool aDoFlush)
{
BringSelfUpToDate(aDoFlush);
return mElements.Length();
}
nsIContent *
nsContentList::Item(uint32_t aIndex, bool aDoFlush)
{
if (mRootNode && aDoFlush && mFlushesNeeded) {
// XXX sXBL/XBL2 issue
nsIDocument* doc = mRootNode->GetUncomposedDoc();
if (doc) {
// Flush pending content changes Bug 4891.
doc->FlushPendingNotifications(Flush_ContentAndNotify);
}
}
if (mState != LIST_UP_TO_DATE)
PopulateSelf(std::min(aIndex, UINT32_MAX - 1) + 1);
ASSERT_IN_SYNC;
NS_ASSERTION(!mRootNode || mState != LIST_DIRTY,
"PopulateSelf left the list in a dirty (useless) state!");
return mElements.SafeElementAt(aIndex);
}
Element*
nsContentList::NamedItem(const nsAString& aName, bool aDoFlush)
{
if (aName.IsEmpty()) {
return nullptr;
}
BringSelfUpToDate(aDoFlush);
uint32_t i, count = mElements.Length();
// Typically IDs and names are atomized
nsCOMPtr<nsIAtom> name = do_GetAtom(aName);
NS_ENSURE_TRUE(name, nullptr);
for (i = 0; i < count; i++) {
nsIContent *content = mElements[i];
// XXX Should this pass eIgnoreCase?
if (content &&
(content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::name,
name, eCaseMatters) ||
content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::id,
name, eCaseMatters))) {
return content->AsElement();
}
}
return nullptr;
}
void
nsContentList::GetSupportedNames(unsigned aFlags, nsTArray<nsString>& aNames)
{
if (!(aFlags & JSITER_HIDDEN)) {
return;
}
BringSelfUpToDate(true);
nsAutoTArray<nsIAtom*, 8> atoms;
for (uint32_t i = 0; i < mElements.Length(); ++i) {
nsIContent *content = mElements.ElementAt(i);
if (content->HasID()) {
nsIAtom* id = content->GetID();
MOZ_ASSERT(id != nsGkAtoms::_empty,
"Empty ids don't get atomized");
if (!atoms.Contains(id)) {
atoms.AppendElement(id);
}
}
nsGenericHTMLElement* el = nsGenericHTMLElement::FromContent(content);
if (el) {
// XXXbz should we be checking for particular tags here? How
// stable is this part of the spec?
// Note: nsINode::HasName means the name is exposed on the document,
// which is false for options, so we don't check it here.
const nsAttrValue* val = el->GetParsedAttr(nsGkAtoms::name);
if (val && val->Type() == nsAttrValue::eAtom) {
nsIAtom* name = val->GetAtomValue();
MOZ_ASSERT(name != nsGkAtoms::_empty,
"Empty names don't get atomized");
if (!atoms.Contains(name)) {
atoms.AppendElement(name);
}
}
}
}
aNames.SetCapacity(atoms.Length());
for (uint32_t i = 0; i < atoms.Length(); ++i) {
aNames.AppendElement(nsDependentAtomString(atoms[i]));
}
}
int32_t
nsContentList::IndexOf(nsIContent *aContent, bool aDoFlush)
{
BringSelfUpToDate(aDoFlush);
return mElements.IndexOf(aContent);
}
int32_t
nsContentList::IndexOf(nsIContent* aContent)
{
return IndexOf(aContent, true);
}
void
nsContentList::NodeWillBeDestroyed(const nsINode* aNode)
{
// We shouldn't do anything useful from now on
RemoveFromCaches();
mRootNode = nullptr;
// We will get no more updates, so we can never know we're up to
// date
SetDirty();
}
NS_IMETHODIMP
nsContentList::GetLength(uint32_t* aLength)
{
*aLength = Length(true);
return NS_OK;
}
NS_IMETHODIMP
nsContentList::Item(uint32_t aIndex, nsIDOMNode** aReturn)
{
nsINode* node = Item(aIndex);
if (node) {
return CallQueryInterface(node, aReturn);
}
*aReturn = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsContentList::NamedItem(const nsAString& aName, nsIDOMNode** aReturn)
{
nsIContent *content = NamedItem(aName, true);
if (content) {
return CallQueryInterface(content, aReturn);
}
*aReturn = nullptr;
return NS_OK;
}
Element*
nsContentList::GetElementAt(uint32_t aIndex)
{
return static_cast<Element*>(Item(aIndex, true));
}
nsIContent*
nsContentList::Item(uint32_t aIndex)
{
return GetElementAt(aIndex);
}
void
nsContentList::AttributeChanged(nsIDocument *aDocument, Element* aElement,
int32_t aNameSpaceID, nsIAtom* aAttribute,
int32_t aModType)
{
NS_PRECONDITION(aElement, "Must have a content node to work with");
if (!mFunc || !mFuncMayDependOnAttr || mState == LIST_DIRTY ||
!MayContainRelevantNodes(aElement->GetParentNode()) ||
!nsContentUtils::IsInSameAnonymousTree(mRootNode, aElement)) {
// Either we're already dirty or this notification doesn't affect
// whether we might match aElement.
return;
}
if (Match(aElement)) {
if (mElements.IndexOf(aElement) == mElements.NoIndex) {
// We match aElement now, and it's not in our list already. Just dirty
// ourselves; this is simpler than trying to figure out where to insert
// aElement.
SetDirty();
}
} else {
// We no longer match aElement. Remove it from our list. If it's
// already not there, this is a no-op (though a potentially
// expensive one). Either way, no change of mState is required
// here.
mElements.RemoveElement(aElement);
}
}
void
nsContentList::ContentAppended(nsIDocument* aDocument, nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NS_PRECONDITION(aContainer, "Can't get at the new content if no container!");
/*
* If the state is LIST_DIRTY then we have no useful information in our list
* and we want to put off doing work as much as possible.
*
* Also, if aContainer is anonymous from our point of view, we know that we
* can't possibly be matching any of the kids.
*
* Optimize out also the common case when just one new node is appended and
* it doesn't match us.
*/
if (mState == LIST_DIRTY ||
!nsContentUtils::IsInSameAnonymousTree(mRootNode, aContainer) ||
!MayContainRelevantNodes(aContainer) ||
(!aFirstNewContent->HasChildren() &&
!aFirstNewContent->GetNextSibling() &&
!MatchSelf(aFirstNewContent))) {
return;
}
/*
* We want to handle the case of ContentAppended by sometimes
* appending the content to our list, not just setting state to
* LIST_DIRTY, since most of our ContentAppended notifications
* should come during pageload and be at the end of the document.
* Do a bit of work to see whether we could just append to what we
* already have.
*/
int32_t count = aContainer->GetChildCount();
if (count > 0) {
uint32_t ourCount = mElements.Length();
bool appendToList = false;
if (ourCount == 0) {
appendToList = true;
} else {
nsIContent* ourLastContent = mElements[ourCount - 1];
/*
* We want to append instead of invalidating if the first thing
* that got appended comes after ourLastContent.
*/
if (nsContentUtils::PositionIsBefore(ourLastContent, aFirstNewContent)) {
appendToList = true;
}
}
if (!appendToList) {
// The new stuff is somewhere in the middle of our list; check
// whether we need to invalidate
for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
if (MatchSelf(cur)) {
// Uh-oh. We're gonna have to add elements into the middle
// of our list. That's not worth the effort.
SetDirty();
break;
}
}
ASSERT_IN_SYNC;
return;
}
/*
* At this point we know we could append. If we're not up to
* date, however, that would be a bad idea -- it could miss some
* content that we never picked up due to being lazy. Further, we
* may never get asked for this content... so don't grab it yet.
*/
if (mState == LIST_LAZY) // be lazy
return;
/*
* We're up to date. That means someone's actively using us; we
* may as well grab this content....
*/
if (mDeep) {
for (nsIContent* cur = aFirstNewContent;
cur;
cur = cur->GetNextNode(aContainer)) {
if (cur->IsElement() && Match(cur->AsElement())) {
mElements.AppendElement(cur);
}
}
} else {
for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
if (cur->IsElement() && Match(cur->AsElement())) {
mElements.AppendElement(cur);
}
}
}
ASSERT_IN_SYNC;
}
}
void
nsContentList::ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
// Note that aContainer can be null here if we are inserting into
// the document itself; any attempted optimizations to this method
// should deal with that.
if (mState != LIST_DIRTY &&
MayContainRelevantNodes(NODE_FROM(aContainer, aDocument)) &&
nsContentUtils::IsInSameAnonymousTree(mRootNode, aChild) &&
MatchSelf(aChild)) {
SetDirty();
}
ASSERT_IN_SYNC;
}
void
nsContentList::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
// Note that aContainer can be null here if we are removing from
// the document itself; any attempted optimizations to this method
// should deal with that.
if (mState != LIST_DIRTY &&
MayContainRelevantNodes(NODE_FROM(aContainer, aDocument)) &&
nsContentUtils::IsInSameAnonymousTree(mRootNode, aChild) &&
MatchSelf(aChild)) {
SetDirty();
}
ASSERT_IN_SYNC;
}
bool
nsContentList::Match(Element *aElement)
{
if (mFunc) {
return (*mFunc)(aElement, mMatchNameSpaceId, mXMLMatchAtom, mData);
}
if (!mXMLMatchAtom)
return false;
mozilla::dom::NodeInfo *ni = aElement->NodeInfo();
bool unknown = mMatchNameSpaceId == kNameSpaceID_Unknown;
bool wildcard = mMatchNameSpaceId == kNameSpaceID_Wildcard;
bool toReturn = mMatchAll;
if (!unknown && !wildcard)
toReturn &= ni->NamespaceEquals(mMatchNameSpaceId);
if (toReturn)
return toReturn;
bool matchHTML = aElement->GetNameSpaceID() == kNameSpaceID_XHTML &&
aElement->OwnerDoc()->IsHTML();
if (unknown) {
return matchHTML ? ni->QualifiedNameEquals(mHTMLMatchAtom) :
ni->QualifiedNameEquals(mXMLMatchAtom);
}
if (wildcard) {
return matchHTML ? ni->Equals(mHTMLMatchAtom) :
ni->Equals(mXMLMatchAtom);
}
return matchHTML ? ni->Equals(mHTMLMatchAtom, mMatchNameSpaceId) :
ni->Equals(mXMLMatchAtom, mMatchNameSpaceId);
}
bool
nsContentList::MatchSelf(nsIContent *aContent)
{
NS_PRECONDITION(aContent, "Can't match null stuff, you know");
NS_PRECONDITION(mDeep || aContent->GetParentNode() == mRootNode,
"MatchSelf called on a node that we can't possibly match");
if (!aContent->IsElement()) {
return false;
}
if (Match(aContent->AsElement()))
return true;
if (!mDeep)
return false;
for (nsIContent* cur = aContent->GetFirstChild();
cur;
cur = cur->GetNextNode(aContent)) {
if (cur->IsElement() && Match(cur->AsElement())) {
return true;
}
}
return false;
}
void
nsContentList::PopulateSelf(uint32_t aNeededLength)
{
if (!mRootNode) {
return;
}
ASSERT_IN_SYNC;
uint32_t count = mElements.Length();
NS_ASSERTION(mState != LIST_DIRTY || count == 0,
"Reset() not called when setting state to LIST_DIRTY?");
if (count >= aNeededLength) // We're all set
return;
uint32_t elementsToAppend = aNeededLength - count;
#ifdef DEBUG
uint32_t invariant = elementsToAppend + mElements.Length();
#endif
if (mDeep) {
// If we already have nodes start searching at the last one, otherwise
// start searching at the root.
nsINode* cur = count ? mElements[count - 1] : mRootNode;
do {
cur = cur->GetNextNode(mRootNode);
if (!cur) {
break;
}
if (cur->IsElement() && Match(cur->AsElement())) {
// Append AsElement() to get nsIContent instead of nsINode
mElements.AppendElement(cur->AsElement());
--elementsToAppend;
}
} while (elementsToAppend);
} else {
nsIContent* cur =
count ? mElements[count-1]->GetNextSibling() : mRootNode->GetFirstChild();
for ( ; cur && elementsToAppend; cur = cur->GetNextSibling()) {
if (cur->IsElement() && Match(cur->AsElement())) {
mElements.AppendElement(cur);
--elementsToAppend;
}
}
}
NS_ASSERTION(elementsToAppend + mElements.Length() == invariant,
"Something is awry!");
if (elementsToAppend != 0)
mState = LIST_UP_TO_DATE;
else
mState = LIST_LAZY;
ASSERT_IN_SYNC;
}
void
nsContentList::RemoveFromHashtable()
{
if (mFunc) {
// This can't be in the table anyway
return;
}
nsDependentAtomString str(mXMLMatchAtom);
nsContentListKey key(mRootNode, mMatchNameSpaceId, str);
uint32_t recentlyUsedCacheIndex = RecentlyUsedCacheIndex(key);
if (sRecentlyUsedContentLists[recentlyUsedCacheIndex] == this) {
sRecentlyUsedContentLists[recentlyUsedCacheIndex] = nullptr;
}
if (!gContentListHashTable.IsInitialized())
return;
PL_DHashTableRemove(&gContentListHashTable, &key);
if (gContentListHashTable.EntryCount() == 0) {
PL_DHashTableFinish(&gContentListHashTable);
}
}
void
nsContentList::BringSelfUpToDate(bool aDoFlush)
{
if (mRootNode && aDoFlush && mFlushesNeeded) {
// XXX sXBL/XBL2 issue
nsIDocument* doc = mRootNode->GetUncomposedDoc();
if (doc) {
// Flush pending content changes Bug 4891.
doc->FlushPendingNotifications(Flush_ContentAndNotify);
}
}
if (mState != LIST_UP_TO_DATE)
PopulateSelf(uint32_t(-1));
ASSERT_IN_SYNC;
NS_ASSERTION(!mRootNode || mState == LIST_UP_TO_DATE,
"PopulateSelf dod not bring content list up to date!");
}
nsCacheableFuncStringContentList::~nsCacheableFuncStringContentList()
{
RemoveFromFuncStringHashtable();
}
void
nsCacheableFuncStringContentList::RemoveFromFuncStringHashtable()
{
if (!gFuncStringContentListHashTable.IsInitialized()) {
return;
}
nsFuncStringCacheKey key(mRootNode, mFunc, mString);
PL_DHashTableRemove(&gFuncStringContentListHashTable, &key);
if (gFuncStringContentListHashTable.EntryCount() == 0) {
PL_DHashTableFinish(&gFuncStringContentListHashTable);
}
}
#ifdef DEBUG_CONTENT_LIST
void
nsContentList::AssertInSync()
{
if (mState == LIST_DIRTY) {
return;
}
if (!mRootNode) {
NS_ASSERTION(mElements.Length() == 0 && mState == LIST_DIRTY,
"Empty iterator isn't quite empty?");
return;
}
// XXX This code will need to change if nsContentLists can ever match
// elements that are outside of the document element.
nsIContent *root;
if (mRootNode->IsNodeOfType(nsINode::eDOCUMENT)) {
root = static_cast<nsIDocument*>(mRootNode)->GetRootElement();
}
else {
root = static_cast<nsIContent*>(mRootNode);
}
nsCOMPtr<nsIContentIterator> iter;
if (mDeep) {
iter = NS_NewPreContentIterator();
iter->Init(root);
iter->First();
}
uint32_t cnt = 0, index = 0;
while (true) {
if (cnt == mElements.Length() && mState == LIST_LAZY) {
break;
}
nsIContent *cur = mDeep ? iter->GetCurrentNode() :
mRootNode->GetChildAt(index++);
if (!cur) {
break;
}
if (cur->IsElement() && Match(cur->AsElement())) {
NS_ASSERTION(cnt < mElements.Length() && mElements[cnt] == cur,
"Elements is out of sync");
++cnt;
}
if (mDeep) {
iter->Next();
}
}
NS_ASSERTION(cnt == mElements.Length(), "Too few elements");
}
#endif
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