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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2006, 2007, 2013 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 LiveNodeList_h
#define LiveNodeList_h
#include "CollectionIndexCache.h"
#include "CollectionType.h"
#include "Document.h"
#include "HTMLNames.h"
#include "NodeList.h"
#include <wtf/Forward.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class Element;
enum NodeListRootType {
NodeListIsRootedAtNode,
NodeListIsRootedAtDocument
};
static bool shouldInvalidateTypeOnAttributeChange(NodeListInvalidationType, const QualifiedName&);
class LiveNodeList : public NodeList {
public:
enum Type {
ClassNodeListType,
NameNodeListType,
TagNodeListType,
HTMLTagNodeListType,
RadioNodeListType,
LabelsNodeListType,
};
LiveNodeList(ContainerNode& ownerNode, Type type, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
: m_ownerNode(ownerNode)
, m_rootType(rootType)
, m_invalidationType(invalidationType)
, m_type(type)
{
ASSERT(m_rootType == static_cast<unsigned>(rootType));
ASSERT(m_invalidationType == static_cast<unsigned>(invalidationType));
ASSERT(m_type == static_cast<unsigned>(type));
document().registerNodeList(*this);
}
virtual Node* namedItem(const AtomicString&) const override final;
virtual bool nodeMatches(Element*) const = 0;
virtual ~LiveNodeList()
{
document().unregisterNodeList(*this);
}
// DOM API
virtual unsigned length() const override final;
virtual Node* item(unsigned offset) const override final;
ALWAYS_INLINE bool isRootedAtDocument() const { return m_rootType == NodeListIsRootedAtDocument; }
ALWAYS_INLINE NodeListInvalidationType invalidationType() const { return static_cast<NodeListInvalidationType>(m_invalidationType); }
ALWAYS_INLINE Type type() const { return static_cast<Type>(m_type); }
ContainerNode& ownerNode() const { return const_cast<ContainerNode&>(m_ownerNode.get()); }
ALWAYS_INLINE void invalidateCache(const QualifiedName* attrName) const
{
if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName))
invalidateCache();
}
void invalidateCache() const;
// For CollectionIndexCache
Element* collectionFirst() const;
Element* collectionLast() const;
Element* collectionTraverseForward(Element&, unsigned count, unsigned& traversedCount) const;
Element* collectionTraverseBackward(Element&, unsigned count) const;
bool collectionCanTraverseBackward() const { return true; }
protected:
Document& document() const { return m_ownerNode->document(); }
ContainerNode& rootNode() const;
ALWAYS_INLINE NodeListRootType rootType() const { return static_cast<NodeListRootType>(m_rootType); }
private:
virtual bool isLiveNodeList() const override { return true; }
Element* iterateForPreviousElement(Element* current) const;
Ref<ContainerNode> m_ownerNode;
mutable CollectionIndexCache<LiveNodeList, Element> m_indexCache;
const unsigned m_rootType : 2;
const unsigned m_invalidationType : 4;
const unsigned m_type : 5;
};
ALWAYS_INLINE bool shouldInvalidateTypeOnAttributeChange(NodeListInvalidationType type, const QualifiedName& attrName)
{
switch (type) {
case InvalidateOnClassAttrChange:
return attrName == HTMLNames::classAttr;
case InvalidateOnNameAttrChange:
return attrName == HTMLNames::nameAttr;
case InvalidateOnIdNameAttrChange:
return attrName == HTMLNames::idAttr || attrName == HTMLNames::nameAttr;
case InvalidateOnForAttrChange:
return attrName == HTMLNames::forAttr;
case InvalidateForFormControls:
return attrName == HTMLNames::nameAttr || attrName == HTMLNames::idAttr || attrName == HTMLNames::forAttr
|| attrName == HTMLNames::formAttr || attrName == HTMLNames::typeAttr;
case InvalidateOnHRefAttrChange:
return attrName == HTMLNames::hrefAttr;
case DoNotInvalidateOnAttributeChanges:
return false;
case InvalidateOnAnyAttrChange:
return true;
}
return false;
}
} // namespace WebCore
#endif // LiveNodeList_h
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