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#include "qitemmappingiterator_p.h"
#include "qsequencemappingiterator_p.h"

#include "qargumentconverter_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ArgumentConverter::ArgumentConverter(const Expression::Ptr &operand,
                                     const ItemType::Ptr &reqType) : UntypedAtomicConverter(operand, reqType)
{
}

ExpressionVisitorResult::Ptr ArgumentConverter::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

Item::Iterator::Ptr ArgumentConverter::mapToSequence(const Item &item,
                                                     const DynamicContext::Ptr &context) const
{
    if(item.isAtomicValue() && !BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(item.type()))
        return makeSingletonIterator(item);
    else
    {
        /* We're using UntypedAtomicConverter::mapToItem(). */
        return makeItemMappingIterator<Item>(ConstPtr(this),
                                             item.sequencedTypedValue(),
                                             context);
    }
}

Item::Iterator::Ptr ArgumentConverter::evaluateSequence(const DynamicContext::Ptr &context) const
{
    return makeSequenceMappingIterator<Item>(ConstPtr(this),
                                             m_operand->evaluateSequence(context),
                                             context);
}

Item ArgumentConverter::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item item(m_operand->evaluateSingleton(context));

    if(item)
        return mapToItem(item, context);
    else /* Empty is allowed. ArgumentConverter doesn't care about cardinality. */
        return Item();
}

SequenceType::List ArgumentConverter::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ZeroOrMoreItems);
    return result;
}

SequenceType::Ptr ArgumentConverter::staticType() const
{
    return CommonSequenceTypes::ZeroOrMoreAtomicTypes;
}

QT_END_NAMESPACE