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#include "qbuiltintypes_p.h"

#include "qcommonsequencetypes_p.h"

#include "qitemmappingiterator_p.h"

#include "qcopyof_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

CopyOf::CopyOf(const Expression::Ptr &operand,

               const bool inheritNSS,

               const bool preserveNSS) : SingleContainer(operand)

                                       , m_inheritNamespaces(inheritNSS)

                                       , m_preserveNamespaces(preserveNSS)

                                       , m_settings((m_inheritNamespaces ? QAbstractXmlNodeModel::InheritNamespaces : QAbstractXmlNodeModel::NodeCopySettings()) |

                                                    (m_preserveNamespaces ? QAbstractXmlNodeModel::PreserveNamespaces : QAbstractXmlNodeModel::NodeCopySettings()))

{

}

Expression::Ptr CopyOf::compress(const StaticContext::Ptr &context)

{

    /* We have zero effect if we have these settings. */

    if(m_inheritNamespaces && m_preserveNamespaces)

        return m_operand->compress(context);

    else

    {

        const ItemType::Ptr t(m_operand->staticType()->itemType());

        /* We have no effect on the empty sequence or atomic values. */

        if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(t)

          || *t == *CommonSequenceTypes::Empty)

            return m_operand->compress(context);

        else

            return SingleContainer::compress(context);

    }

}

void CopyOf::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const

{

    /* Optimization: this completely breaks streaming. We get a call to

     * evaluateToSequenceReceiver() but we require heap allocations by calling

     * evaluateSequence(). */

    const Item::Iterator::Ptr it(m_operand->evaluateSequence(context));

    QAbstractXmlReceiver *const receiver = context->outputReceiver();

    Item next(it->next());

    while(next)

    {

        if(next.isNode())

        {

            const QXmlNodeModelIndex &asNode = next.asNode();

            asNode.model()->copyNodeTo(asNode, receiver, m_settings);

        }

        else

            receiver->item(next);

        next = it->next();

    }

}

ExpressionVisitorResult::Ptr CopyOf::accept(const ExpressionVisitor::Ptr &visitor) const

{

    return visitor->visit(this);

}

SequenceType::Ptr CopyOf::staticType() const

{

    return m_operand->staticType();

}

SequenceType::List CopyOf::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    return result;

}

Expression::Properties CopyOf::properties() const

{

    /* We have the content of node constructors as children, but even though

     * createCopyOf() typically avoids creating us, we can still end up with an operand

     * that allows compression. We must always avoid that, because we don't have

     * implementation of evaluateSequence(), and so on. */

    return (m_operand->properties() & ~CreatesFocusForLast) | DisableElimination;

}

ItemType::Ptr CopyOf::expectedContextItemType() const

{

    return m_operand->expectedContextItemType();

}

QT_END_NAMESPACE