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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012, 2013, 2014 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef HTMLCollection_h
#define HTMLCollection_h
#include "CollectionIndexCache.h"
#include "HTMLNames.h"
#include "LiveNodeList.h"
#include "ScriptWrappable.h"
#include <wtf/HashMap.h>
namespace WebCore {
class Element;
class CollectionNamedElementCache {
public:
const Vector<Element*>* findElementsWithId(const AtomicString& id) const;
const Vector<Element*>* findElementsWithName(const AtomicString& name) const;
const Vector<AtomicString>& propertyNames() const { return m_propertyNames; }
void appendToIdCache(const AtomicString& id, Element&);
void appendToNameCache(const AtomicString& name, Element&);
void didPopulate();
size_t memoryCost() const;
private:
typedef HashMap<AtomicStringImpl*, Vector<Element*>> StringToElementsMap;
const Vector<Element*>* find(const StringToElementsMap&, const AtomicString& key) const;
void append(StringToElementsMap&, const AtomicString& key, Element&);
StringToElementsMap m_idMap;
StringToElementsMap m_nameMap;
Vector<AtomicString> m_propertyNames;
#if !ASSERT_DISABLED
bool m_didPopulate { false };
#endif
};
// HTMLCollection subclasses NodeList to maintain legacy ObjC API compatibility.
class HTMLCollection : public NodeList {
public:
virtual ~HTMLCollection();
// DOM API
virtual Element* item(unsigned index) const override = 0; // Tighten return type from NodeList::item().
virtual Element* namedItem(const AtomicString& name) const = 0;
const Vector<AtomicString>& supportedPropertyNames();
RefPtr<NodeList> tags(const String&);
// Non-DOM API
Vector<Ref<Element>> namedItems(const AtomicString& name) const;
virtual size_t memoryCost() const override;
bool isRootedAtDocument() const;
NodeListInvalidationType invalidationType() const;
CollectionType type() const;
ContainerNode& ownerNode() const;
ContainerNode& rootNode() const;
void invalidateCacheForAttribute(const QualifiedName* attributeName);
virtual void invalidateCache(Document&);
bool hasNamedElementCache() const;
protected:
HTMLCollection(ContainerNode& base, CollectionType);
virtual void updateNamedElementCache() const;
Element* namedItemSlow(const AtomicString& name) const;
void setNamedItemCache(std::unique_ptr<CollectionNamedElementCache>) const;
const CollectionNamedElementCache& namedItemCaches() const;
Document& document() const;
void invalidateNamedElementCache(Document&) const;
enum RootType { IsRootedAtNode, IsRootedAtDocument };
static RootType rootTypeFromCollectionType(CollectionType);
Ref<ContainerNode> m_ownerNode;
mutable std::unique_ptr<CollectionNamedElementCache> m_namedElementCache;
const unsigned m_collectionType : 5;
const unsigned m_invalidationType : 4;
const unsigned m_rootType : 1;
};
inline ContainerNode& HTMLCollection::rootNode() const
{
if (isRootedAtDocument() && ownerNode().inDocument())
return ownerNode().document();
return ownerNode();
}
inline const Vector<Element*>* CollectionNamedElementCache::findElementsWithId(const AtomicString& id) const
{
return find(m_idMap, id);
}
inline const Vector<Element*>* CollectionNamedElementCache::findElementsWithName(const AtomicString& name) const
{
return find(m_nameMap, name);
}
inline void CollectionNamedElementCache::appendToIdCache(const AtomicString& id, Element& element)
{
append(m_idMap, id, element);
}
inline void CollectionNamedElementCache::appendToNameCache(const AtomicString& name, Element& element)
{
append(m_nameMap, name, element);
}
inline size_t CollectionNamedElementCache::memoryCost() const
{
return (m_idMap.size() + m_nameMap.size()) * sizeof(Element*) + m_propertyNames.size() * sizeof(AtomicString);
}
inline void CollectionNamedElementCache::didPopulate()
{
#if !ASSERT_DISABLED
m_didPopulate = true;
#endif
if (size_t cost = memoryCost())
reportExtraMemoryAllocatedForCollectionIndexCache(cost);
}
inline const Vector<Element*>* CollectionNamedElementCache::find(const StringToElementsMap& map, const AtomicString& key) const
{
ASSERT(m_didPopulate);
auto it = map.find(key.impl());
return it != map.end() ? &it->value : nullptr;
}
inline void CollectionNamedElementCache::append(StringToElementsMap& map, const AtomicString& key, Element& element)
{
if (!m_idMap.contains(key.impl()) && !m_nameMap.contains(key.impl()))
m_propertyNames.append(key);
map.add(key.impl(), Vector<Element*>()).iterator->value.append(&element);
}
inline size_t HTMLCollection::memoryCost() const
{
return m_namedElementCache ? m_namedElementCache->memoryCost() : 0;
}
inline bool HTMLCollection::isRootedAtDocument() const
{
return m_rootType == IsRootedAtDocument;
}
inline NodeListInvalidationType HTMLCollection::invalidationType() const
{
return static_cast<NodeListInvalidationType>(m_invalidationType);
}
inline CollectionType HTMLCollection::type() const
{
return static_cast<CollectionType>(m_collectionType);
}
inline ContainerNode& HTMLCollection::ownerNode() const
{
return const_cast<ContainerNode&>(m_ownerNode.get());
}
inline Document& HTMLCollection::document() const
{
return m_ownerNode->document();
}
inline void HTMLCollection::invalidateCacheForAttribute(const QualifiedName* attributeName)
{
if (!attributeName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attributeName))
invalidateCache(document());
else if (hasNamedElementCache() && (*attributeName == HTMLNames::idAttr || *attributeName == HTMLNames::nameAttr))
invalidateNamedElementCache(document());
}
inline bool HTMLCollection::hasNamedElementCache() const
{
return !!m_namedElementCache;
}
inline void HTMLCollection::setNamedItemCache(std::unique_ptr<CollectionNamedElementCache> cache) const
{
ASSERT(cache);
ASSERT(!m_namedElementCache);
cache->didPopulate();
m_namedElementCache = WTFMove(cache);
document().collectionCachedIdNameMap(*this);
}
inline const CollectionNamedElementCache& HTMLCollection::namedItemCaches() const
{
ASSERT(!!m_namedElementCache);
return *m_namedElementCache;
}
} // namespace WebCore
#define SPECIALIZE_TYPE_TRAITS_HTMLCOLLECTION(ClassName, Type) \
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ClassName) \
static bool isType(const WebCore::HTMLCollection& collection) { return collection.type() == WebCore::Type; } \
SPECIALIZE_TYPE_TRAITS_END()
#endif // HTMLCollection_h
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