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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 <wtf/CheckedPtr.h>
#if ASSERT_ENABLED
#include "ElementIteratorAssertions.h"
#endif
namespace WebCore {
class ContainerNode;
class Node;
template <typename ElementType>
class ElementIterator {
public:
using iterator_category = std::forward_iterator_tag;
using value_type = ElementType;
using difference_type = ptrdiff_t;
using pointer = value_type*;
using reference = value_type&;
ElementIterator() = default;
inline ElementType& operator*() const;
inline ElementType* operator->() const;
constexpr operator bool() const { return m_current.get(); }
constexpr bool operator!() const { return !m_current; }
constexpr bool operator==(std::nullptr_t) const { return !m_current; }
constexpr bool operator==(const ElementIterator&) const;
inline ElementIterator& traverseNext();
inline ElementIterator& traversePrevious();
inline ElementIterator& traverseNextSibling();
inline ElementIterator& traversePreviousSibling();
inline ElementIterator& traverseNextSkippingChildren();
inline ElementIterator& traverseAncestor();
inline void dropAssertions();
protected:
ElementIterator(const ContainerNode* root, ElementType* current);
private:
CheckedPtr<const ContainerNode> m_root;
CheckedPtr<ElementType> m_current;
#if ASSERT_ENABLED
ElementIteratorAssertions m_assertions;
#endif
};
template <typename ElementType>
inline ElementType* findElementAncestorOfType(const Node&);
// ElementIterator
template <typename ElementType>
inline ElementIterator<ElementType>::ElementIterator(const ContainerNode* root, ElementType* current)
: m_root(root)
, m_current(current)
#if ASSERT_ENABLED
, m_assertions(current)
#endif
{
}
template<typename ElementType> constexpr bool ElementIterator<ElementType>::operator==(const ElementIterator& other) const
{
ASSERT(m_root == other.m_root || !m_current || !other.m_current);
return m_current == other.m_current;
}
template <typename ElementType>
inline ElementType& ElementIterator<ElementType>::operator*() const
{
ASSERT(m_current);
ASSERT(!m_assertions.domTreeHasMutated());
return *m_current;
}
template <typename ElementType>
inline ElementType* ElementIterator<ElementType>::operator->() const
{
ASSERT(m_current);
ASSERT(!m_assertions.domTreeHasMutated());
return m_current.get();
}
template <typename ElementType>
inline void ElementIterator<ElementType>::dropAssertions()
{
#if ASSERT_ENABLED
m_assertions.clear();
#endif
}
} // namespace WebCore
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