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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 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 "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,
NodeListIsRootedAtDocumentIfOwnerHasItemrefAttr,
};
class LiveNodeListBase : public NodeList {
public:
enum ItemAfterOverrideType {
OverridesItemAfter,
DoesNotOverrideItemAfter,
};
LiveNodeListBase(Node* ownerNode, NodeListRootType rootType, NodeListInvalidationType invalidationType,
bool shouldOnlyIncludeDirectChildren, CollectionType collectionType, ItemAfterOverrideType itemAfterOverrideType)
: m_ownerNode(ownerNode)
, m_cachedItem(0)
, m_isLengthCacheValid(false)
, m_isItemCacheValid(false)
, m_rootType(rootType)
, m_invalidationType(invalidationType)
, m_shouldOnlyIncludeDirectChildren(shouldOnlyIncludeDirectChildren)
, m_isNameCacheValid(false)
, m_collectionType(collectionType)
, m_overridesItemAfter(itemAfterOverrideType == OverridesItemAfter)
, m_isItemRefElementsCacheValid(false)
{
ASSERT(m_rootType == static_cast<unsigned>(rootType));
ASSERT(m_invalidationType == static_cast<unsigned>(invalidationType));
ASSERT(m_collectionType == static_cast<unsigned>(collectionType));
ASSERT(!m_overridesItemAfter || !isNodeList(collectionType));
if (collectionType != ChildNodeListType)
document()->registerNodeList(this);
}
virtual ~LiveNodeListBase()
{
if (type() != ChildNodeListType)
document()->unregisterNodeList(this);
}
// DOM API
virtual unsigned length() const OVERRIDE;
virtual Node* item(unsigned offset) const OVERRIDE;
ALWAYS_INLINE bool hasIdNameCache() const { return !isNodeList(type()); }
ALWAYS_INLINE bool isRootedAtDocument() const { return m_rootType == NodeListIsRootedAtDocument || m_rootType == NodeListIsRootedAtDocumentIfOwnerHasItemrefAttr; }
ALWAYS_INLINE NodeListInvalidationType invalidationType() const { return static_cast<NodeListInvalidationType>(m_invalidationType); }
ALWAYS_INLINE CollectionType type() const { return static_cast<CollectionType>(m_collectionType); }
Node* ownerNode() const { return m_ownerNode.get(); }
ALWAYS_INLINE void invalidateCache(const QualifiedName* attrName) const
{
if (!attrName || shouldInvalidateTypeOnAttributeChange(invalidationType(), *attrName))
invalidateCache();
else if (hasIdNameCache() && (*attrName == HTMLNames::idAttr || *attrName == HTMLNames::nameAttr))
invalidateIdNameCacheMaps();
}
void invalidateCache() const;
void invalidateIdNameCacheMaps() const;
static bool shouldInvalidateTypeOnAttributeChange(NodeListInvalidationType, const QualifiedName&);
protected:
Document* document() const { return m_ownerNode->document(); }
Node* rootNode() const;
ContainerNode* rootContainerNode() const;
bool overridesItemAfter() const { return m_overridesItemAfter; }
ALWAYS_INLINE bool isItemCacheValid() const { return m_isItemCacheValid; }
ALWAYS_INLINE Node* cachedItem() const { return m_cachedItem; }
ALWAYS_INLINE unsigned cachedItemOffset() const { return m_cachedItemOffset; }
ALWAYS_INLINE bool isLengthCacheValid() const { return m_isLengthCacheValid; }
ALWAYS_INLINE unsigned cachedLength() const { return m_cachedLength; }
ALWAYS_INLINE void setLengthCache(unsigned length) const
{
m_cachedLength = length;
m_isLengthCacheValid = true;
}
ALWAYS_INLINE void setItemCache(Node* item, unsigned offset) const
{
ASSERT(item);
m_cachedItem = item;
m_cachedItemOffset = offset;
m_isItemCacheValid = true;
}
void setItemCache(Node* item, unsigned offset, unsigned elementsArrayOffset) const;
ALWAYS_INLINE bool isItemRefElementsCacheValid() const { return m_isItemRefElementsCacheValid; }
ALWAYS_INLINE void setItemRefElementsCacheValid() const { m_isItemRefElementsCacheValid = true; }
ALWAYS_INLINE NodeListRootType rootType() const { return static_cast<NodeListRootType>(m_rootType); }
bool hasNameCache() const { return m_isNameCacheValid; }
void setHasNameCache() const { m_isNameCacheValid = true; }
bool shouldOnlyIncludeDirectChildren() const { return m_shouldOnlyIncludeDirectChildren; }
private:
Node* itemBeforeOrAfterCachedItem(unsigned offset, ContainerNode* root) const;
Node* traverseChildNodeListForwardToOffset(unsigned offset, Node* currentNode, unsigned& currentOffset) const;
Element* traverseLiveNodeListFirstElement(ContainerNode* root) const;
Element* traverseLiveNodeListForwardToOffset(unsigned offset, Element* currentElement, unsigned& currentOffset, ContainerNode* root) const;
bool isLastItemCloserThanLastOrCachedItem(unsigned offset) const;
bool isFirstItemCloserThanCachedItem(unsigned offset) const;
Node* iterateForPreviousNode(Node* current) const;
Node* itemBefore(Node* previousItem) const;
RefPtr<Node> m_ownerNode;
mutable Node* m_cachedItem;
mutable unsigned m_cachedLength;
mutable unsigned m_cachedItemOffset;
mutable unsigned m_isLengthCacheValid : 1;
mutable unsigned m_isItemCacheValid : 1;
const unsigned m_rootType : 2;
const unsigned m_invalidationType : 4;
const unsigned m_shouldOnlyIncludeDirectChildren : 1;
// From HTMLCollection
mutable unsigned m_isNameCacheValid : 1;
const unsigned m_collectionType : 5;
const unsigned m_overridesItemAfter : 1;
mutable unsigned m_isItemRefElementsCacheValid : 1;
};
ALWAYS_INLINE bool LiveNodeListBase::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 InvalidateOnItemAttrChange:
#if ENABLE(MICRODATA)
return attrName == HTMLNames::itemscopeAttr || attrName == HTMLNames::itempropAttr
|| attrName == HTMLNames::itemtypeAttr || attrName == HTMLNames::itemrefAttr || attrName == HTMLNames::idAttr;
#endif // Intentionally fall through
case DoNotInvalidateOnAttributeChanges:
return false;
case InvalidateOnAnyAttrChange:
return true;
}
return false;
}
class LiveNodeList : public LiveNodeListBase {
public:
LiveNodeList(PassRefPtr<Node> ownerNode, CollectionType collectionType, NodeListInvalidationType invalidationType, NodeListRootType rootType = NodeListIsRootedAtNode)
: LiveNodeListBase(ownerNode.get(), rootType, invalidationType, collectionType == ChildNodeListType,
collectionType, DoesNotOverrideItemAfter)
{ }
virtual Node* namedItem(const AtomicString&) const OVERRIDE;
virtual bool nodeMatches(Element*) const = 0;
private:
virtual bool isLiveNodeList() const OVERRIDE { return true; }
};
} // namespace WebCore
#endif // LiveNodeList_h
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