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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 ElementChildRange;
// Range for iterating through child elements.
template <typename ElementType> ElementChildRange<ElementType> childrenOfType(ContainerNode&);
template <typename ElementType> ElementChildRange<const ElementType> childrenOfType(const ContainerNode&);
template <typename ElementType>
class ElementChildIterator : public ElementIterator<ElementType> {
public:
ElementChildIterator() = default;
ElementChildIterator(const ContainerNode& parent, ElementType* current);
ElementChildIterator& operator--();
ElementChildIterator& operator++();
};
template <typename ElementType>
class ElementChildRange {
public:
ElementChildRange(const ContainerNode& parent);
ElementChildIterator<ElementType> begin() const;
static constexpr std::nullptr_t end() { return nullptr; }
ElementChildIterator<ElementType> beginAt(ElementType&) const;
ElementType* first() const;
ElementType* last() const;
private:
const ContainerNode& m_parent;
};
// ElementChildIterator
template <typename ElementType>
inline ElementChildIterator<ElementType>::ElementChildIterator(const ContainerNode& parent, ElementType* current)
: ElementIterator<ElementType>(&parent, current)
{
}
template <typename ElementType>
inline ElementChildIterator<ElementType>& ElementChildIterator<ElementType>::operator--()
{
ElementIterator<ElementType>::traversePreviousSibling();
return *this;
}
template <typename ElementType>
inline ElementChildIterator<ElementType>& ElementChildIterator<ElementType>::operator++()
{
ElementIterator<ElementType>::traverseNextSibling();
return *this;
}
// ElementChildRange
template <typename ElementType>
inline ElementChildRange<ElementType>::ElementChildRange(const ContainerNode& parent)
: m_parent(parent)
{
}
template <typename ElementType>
inline ElementChildIterator<ElementType> ElementChildRange<ElementType>::begin() const
{
return ElementChildIterator<ElementType>(m_parent, Traversal<ElementType>::firstChild(m_parent));
}
template <typename ElementType>
inline ElementType* ElementChildRange<ElementType>::first() const
{
return Traversal<ElementType>::firstChild(m_parent);
}
template <typename ElementType>
inline ElementType* ElementChildRange<ElementType>::last() const
{
return Traversal<ElementType>::lastChild(m_parent);
}
template <typename ElementType>
inline ElementChildIterator<ElementType> ElementChildRange<ElementType>::beginAt(ElementType& child) const
{
ASSERT(child.parentNode() == &m_parent);
return ElementChildIterator<ElementType>(m_parent, &child);
}
// Standalone functions
template <typename ElementType>
inline ElementChildRange<ElementType> childrenOfType(ContainerNode& parent)
{
return ElementChildRange<ElementType>(parent);
}
template <typename ElementType>
inline ElementChildRange<const ElementType> childrenOfType(const ContainerNode& parent)
{
return ElementChildRange<const ElementType>(parent);
}
} // namespace WebCore
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