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/*
* Copyright (C) 2013-2020 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. ``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
* 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.
*/
#pragma once
#include "ElementIterator.h"
namespace WebCore {
template<typename> class ElementAncestorRange;
// Range for iterating an element and its ancestors.
template<typename ElementType> ElementAncestorRange<ElementType> lineageOfType(Element& first);
template<typename ElementType> ElementAncestorRange<const ElementType> lineageOfType(const Element& first);
// Range for iterating a node's element ancestors.
template<typename ElementType> ElementAncestorRange<ElementType> ancestorsOfType(Node& descendant);
template<typename ElementType> ElementAncestorRange<const ElementType> ancestorsOfType(const Node& descendant);
template <typename ElementType>
class ElementAncestorIterator : public ElementIterator<ElementType> {
public:
explicit ElementAncestorIterator(ElementType* = nullptr);
ElementAncestorIterator& operator++();
};
template <typename ElementType>
class ElementAncestorRange {
public:
explicit ElementAncestorRange(ElementType* first);
ElementAncestorIterator<ElementType> begin() const;
static constexpr std::nullptr_t end() { return nullptr; }
ElementType* first() const { return m_first; }
private:
ElementType* const m_first;
};
// ElementAncestorIterator
template <typename ElementType>
inline ElementAncestorIterator<ElementType>::ElementAncestorIterator(ElementType* current)
: ElementIterator<ElementType>(nullptr, current)
{
}
template <typename ElementType>
inline ElementAncestorIterator<ElementType>& ElementAncestorIterator<ElementType>::operator++()
{
ElementIterator<ElementType>::traverseAncestor();
return *this;
}
// ElementAncestorRange
template <typename ElementType>
inline ElementAncestorRange<ElementType>::ElementAncestorRange(ElementType* first)
: m_first(first)
{
}
template <typename ElementType>
inline ElementAncestorIterator<ElementType> ElementAncestorRange<ElementType>::begin() const
{
return ElementAncestorIterator<ElementType>(m_first);
}
// Standalone functions
template<> inline ElementAncestorRange<Element> lineageOfType<Element>(Element& first)
{
return ElementAncestorRange<Element>(&first);
}
template <typename ElementType>
inline ElementAncestorRange<ElementType> lineageOfType(Element& first)
{
if (is<ElementType>(first))
return ElementAncestorRange<ElementType>(&downcast<ElementType>(first));
return ancestorsOfType<ElementType>(first);
}
template<> inline ElementAncestorRange<const Element> lineageOfType<Element>(const Element& first)
{
return ElementAncestorRange<const Element>(&first);
}
template <typename ElementType>
inline ElementAncestorRange<const ElementType> lineageOfType(const Element& first)
{
if (is<ElementType>(first))
return ElementAncestorRange<const ElementType>(&downcast<ElementType>(first));
return ancestorsOfType<ElementType>(first);
}
template <typename ElementType>
inline ElementAncestorRange<ElementType> ancestorsOfType(Node& descendant)
{
return ElementAncestorRange<ElementType>(findElementAncestorOfType<ElementType>(descendant));
}
template <typename ElementType>
inline ElementAncestorRange<const ElementType> ancestorsOfType(const Node& descendant)
{
return ElementAncestorRange<const ElementType>(findElementAncestorOfType<const ElementType>(descendant));
}
} // namespace WebCore
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