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/*
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CachedHTMLCollection_h
#define CachedHTMLCollection_h
#include "CollectionTraversal.h"
#include "HTMLCollection.h"
#include "HTMLElement.h"
namespace WebCore {
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
class CachedHTMLCollection : public HTMLCollection {
public:
CachedHTMLCollection(ContainerNode& base, CollectionType);
virtual ~CachedHTMLCollection();
virtual unsigned length() const override final { return m_indexCache.nodeCount(collection()); }
virtual Element* item(unsigned offset) const override { return m_indexCache.nodeAt(collection(), offset); }
virtual Element* namedItem(const AtomicString& name) const override;
virtual size_t memoryCost() const override final { return m_indexCache.memoryCost() + HTMLCollection::memoryCost(); }
// For CollectionIndexCache; do not use elsewhere.
using CollectionTraversalIterator = typename CollectionTraversal<traversalType>::Iterator;
CollectionTraversalIterator collectionBegin() const { return CollectionTraversal<traversalType>::begin(collection(), rootNode()); }
CollectionTraversalIterator collectionLast() const { return CollectionTraversal<traversalType>::last(collection(), rootNode()); }
CollectionTraversalIterator collectionEnd() const { return CollectionTraversal<traversalType>::end(rootNode()); }
void collectionTraverseForward(CollectionTraversalIterator& current, unsigned count, unsigned& traversedCount) const { CollectionTraversal<traversalType>::traverseForward(collection(), current, count, traversedCount); }
void collectionTraverseBackward(CollectionTraversalIterator& current, unsigned count) const { CollectionTraversal<traversalType>::traverseBackward(collection(), current, count); }
bool collectionCanTraverseBackward() const { return traversalType != CollectionTraversalType::CustomForwardOnly; }
void willValidateIndexCache() const { document().registerCollection(const_cast<CachedHTMLCollection<HTMLCollectionClass, traversalType>&>(*this)); }
virtual void invalidateCache(Document&) override;
bool elementMatches(Element&) const;
private:
HTMLCollectionClass& collection() { return static_cast<HTMLCollectionClass&>(*this); }
const HTMLCollectionClass& collection() const { return static_cast<const HTMLCollectionClass&>(*this); }
mutable CollectionIndexCache<HTMLCollectionClass, CollectionTraversalIterator> m_indexCache;
};
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
CachedHTMLCollection<HTMLCollectionClass, traversalType>::CachedHTMLCollection(ContainerNode& base, CollectionType collectionType)
: HTMLCollection(base, collectionType)
, m_indexCache(collection())
{ }
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
CachedHTMLCollection<HTMLCollectionClass, traversalType>::~CachedHTMLCollection()
{
if (m_indexCache.hasValidCache(collection()))
document().unregisterCollection(*this);
}
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
void CachedHTMLCollection<HTMLCollectionClass, traversalType>::invalidateCache(Document& document)
{
HTMLCollection::invalidateCache(document);
if (m_indexCache.hasValidCache(collection())) {
document.unregisterCollection(*this);
m_indexCache.invalidate(collection());
}
}
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
bool CachedHTMLCollection<HTMLCollectionClass, traversalType>::elementMatches(Element&) const
{
// We call the elementMatches() method directly on the subclass instead for performance.
ASSERT_NOT_REACHED();
return false;
}
static inline bool nameShouldBeVisibleInDocumentAll(HTMLElement& element)
{
// The document.all collection returns only certain types of elements by name,
// although it returns any type of element by id.
return element.hasTagName(HTMLNames::appletTag)
|| element.hasTagName(HTMLNames::embedTag)
|| element.hasTagName(HTMLNames::formTag)
|| element.hasTagName(HTMLNames::imgTag)
|| element.hasTagName(HTMLNames::inputTag)
|| element.hasTagName(HTMLNames::objectTag)
|| element.hasTagName(HTMLNames::selectTag);
}
static inline bool nameShouldBeVisibleInDocumentAll(Element& element)
{
return is<HTMLElement>(element) && nameShouldBeVisibleInDocumentAll(downcast<HTMLElement>(element));
}
template <typename HTMLCollectionClass, CollectionTraversalType traversalType>
Element* CachedHTMLCollection<HTMLCollectionClass, traversalType>::namedItem(const AtomicString& name) const
{
// http://msdn.microsoft.com/workshop/author/dhtml/reference/methods/nameditem.asp
// This method first searches for an object with a matching id
// attribute. If a match is not found, the method then searches for an
// object with a matching name attribute, but only on those elements
// that are allowed a name attribute.
if (name.isEmpty())
return nullptr;
ContainerNode& root = rootNode();
if (traversalType != CollectionTraversalType::CustomForwardOnly && root.isInTreeScope()) {
Element* candidate = nullptr;
TreeScope& treeScope = root.treeScope();
if (treeScope.hasElementWithId(*name.impl())) {
if (!treeScope.containsMultipleElementsWithId(name))
candidate = treeScope.getElementById(name);
} else if (treeScope.hasElementWithName(*name.impl())) {
if (!treeScope.containsMultipleElementsWithName(name)) {
candidate = treeScope.getElementByName(name);
if (candidate && type() == DocAll && !nameShouldBeVisibleInDocumentAll(*candidate))
candidate = nullptr;
}
} else
return nullptr;
if (candidate && collection().elementMatches(*candidate)) {
if (traversalType == CollectionTraversalType::ChildrenOnly ? candidate->parentNode() == &root : candidate->isDescendantOf(&root))
return candidate;
}
}
return namedItemSlow(name);
}
} // namespace WebCore
#endif // CachedHTMLCollection_h
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