rapidxml_iterators.hpp

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#pragma once
 
// Copyright (C) 2006, 2009 Marcin Kalicinski
// Version 1.13
// Revision $DateTime: 2009/05/13 01:46:17 $
//! \file rapidxml_iterators.hpp This file contains rapidxml iterators
 
#include "rapidxml.hpp"
 
namespace rapidxml
{
 
    //! Iterator of child nodes of xml_node
    template <class Ch>
    class node_iterator
    {
 
    public:
        using value_type = typename xml_node<Ch>;
        using reference = typename xml_node<Ch>&;
        using pointer = typename xml_node<Ch>*;
        using difference_type = std::ptrdiff_t;
        using iterator_category = std::bidirectional_iterator_tag;
 
        node_iterator() : m_node(0)
        {
        }
 
        node_iterator(xml_node<Ch>* node) : m_node(node->first_node())
        {
        }
 
        reference
        operator*() const
        {
            assert(m_node);
            return *m_node;
        }
 
        pointer
        operator->() const
        {
            assert(m_node);
            return m_node;
        }
 
        node_iterator&
        operator++()
        {
            assert(m_node);
            m_node = m_node->next_sibling();
            return *this;
        }
 
        node_iterator
        operator++(int)
        {
            node_iterator tmp = *this;
            ++this;
            return tmp;
        }
 
        node_iterator&
        operator--()
        {
            assert(m_node && m_node->previous_sibling());
            m_node = m_node->previous_sibling();
            return *this;
        }
 
        node_iterator
        operator--(int)
        {
            node_iterator tmp = *this;
            ++this;
            return tmp;
        }
 
        bool
        operator==(const node_iterator<Ch>& rhs)
        {
            return m_node == rhs.m_node;
        }
 
        bool
        operator!=(const node_iterator<Ch>& rhs)
        {
            return m_node != rhs.m_node;
        }
 
    private:
        xml_node<Ch>* m_node;
    };
 
    //! Iterator of child attributes of xml_node
    template <class Ch>
    class attribute_iterator
    {
 
    public:
        using value_type = typename xml_attribute<Ch>;
        using reference = typename xml_attribute<Ch>&;
        using pointer = typename xml_attribute<Ch>*;
        using difference_type = std::ptrdiff_t;
        using iterator_category = std::bidirectional_iterator_tag;
 
        attribute_iterator() : m_attribute(0)
        {
        }
 
        attribute_iterator(xml_node<Ch>* node) : m_attribute(node->first_attribute())
        {
        }
 
        reference
        operator*() const
        {
            assert(m_attribute);
            return *m_attribute;
        }
 
        pointer
        operator->() const
        {
            assert(m_attribute);
            return m_attribute;
        }
 
        attribute_iterator&
        operator++()
        {
            assert(m_attribute);
            m_attribute = m_attribute->next_attribute();
            return *this;
        }
 
        attribute_iterator
        operator++(int)
        {
            attribute_iterator tmp = *this;
            ++this;
            return tmp;
        }
 
        attribute_iterator&
        operator--()
        {
            assert(m_attribute && m_attribute->previous_attribute());
            m_attribute = m_attribute->previous_attribute();
            return *this;
        }
 
        attribute_iterator
        operator--(int)
        {
            attribute_iterator tmp = *this;
            ++this;
            return tmp;
        }
 
        bool
        operator==(const attribute_iterator<Ch>& rhs)
        {
            return m_attribute == rhs.m_attribute;
        }
 
        bool
        operator!=(const attribute_iterator<Ch>& rhs)
        {
            return m_attribute != rhs.m_attribute;
        }
 
    private:
        xml_attribute<Ch>* m_attribute;
    };
 
} // namespace rapidxml