qt-everywhere-src-5.15.1/qtxmlpatterns/src/xmlpatterns/iterators/qintersectiterator.cpp

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#include "qitem_p.h"

#include "qintersectiterator_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

IntersectIterator::IntersectIterator(const Item::Iterator::Ptr &it1,
                                     const Item::Iterator::Ptr &it2) : m_it1(it1),
                                                                       m_it2(it2),
                                                                       m_position(0),
                                                                       m_node1(m_it1->next()),
                                                                       m_node2(m_it2->next())
{
    Q_ASSERT(m_it1);
    Q_ASSERT(m_it2);
}

Item IntersectIterator::next()
{
    if(!m_node1 || !m_node2)
        return closedExit();

    do
    {
        if(m_node1.asNode().model() == m_node2.asNode().model())
        {
            switch(m_node1.asNode().compareOrder(m_node2.asNode()))
            {
                case QXmlNodeModelIndex::Precedes:
                {
                    m_node1 = m_it1->next();
                    break;
                }
                case QXmlNodeModelIndex::Follows:
                {
                    m_node2 = m_it2->next();
                    break;
                }
                default:
                {
                    m_current = m_node2;
                    m_node1 = m_it1->next();
                    m_node2 = m_it2->next();
                    ++m_position;
                    return m_current;
                }
            }
        }
        else
            m_node2 = m_it2->next();
    }
    while(m_node1 && m_node2);

    return Item();
}

Item IntersectIterator::current() const
{
    return m_current;
}

xsInteger IntersectIterator::position() const
{
    return m_position;
}

Item::Iterator::Ptr IntersectIterator::copy() const
{
    return Item::Iterator::Ptr(new IntersectIterator(m_it1->copy(), m_it2->copy()));
}

QT_END_NAMESPACE