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#include "qbuiltintypes_p.h"

#include "qcommonsequencetypes_p.h"

#include "qcurrentitemcontext_p.h"

#include "qstaticcurrentcontext_p.h"

#include "qcurrentitemstore_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

CurrentItemStore::CurrentItemStore(const Expression::Ptr &operand) : SingleContainer(operand)

{

}

DynamicContext::Ptr CurrentItemStore::createContext(const DynamicContext::Ptr &old) const

{

    return DynamicContext::Ptr(new CurrentItemContext(old->contextItem(), old));

}

bool CurrentItemStore::evaluateEBV(const DynamicContext::Ptr &context) const

{

    return m_operand->evaluateEBV(createContext(context));

}

Item::Iterator::Ptr CurrentItemStore::evaluateSequence(const DynamicContext::Ptr &context) const

{

    return m_operand->evaluateSequence(createContext(context));

}

Item CurrentItemStore::evaluateSingleton(const DynamicContext::Ptr &context) const

{

    return m_operand->evaluateSingleton(createContext(context));

}

SequenceType::Ptr CurrentItemStore::staticType() const

{

    return m_operand->staticType();

}

SequenceType::List CurrentItemStore::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    return result;

}

StaticContext::Ptr CurrentItemStore::newStaticContext(const StaticContext::Ptr &context)

{

    /* It might be we are generated despite there is no focus. In that case

     * an error will reported in case current() is used, but in any case we cannot

     * crash, so use item() in case we have no focus.

     *

     * Such a case is when we're inside a named template, and it's invoked

     * without focus. */

    const ItemType::Ptr t(context->contextItemType());

    return StaticContext::Ptr(new StaticCurrentContext(t ? t : BuiltinTypes::item, context));

}

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

{

    const Expression::Ptr me(SingleContainer::compress(newStaticContext(context)));

    if(me != this)

        return me;

    else

    {

        /* If fn:current() isn't called, there's no point in us sticking

         * around. */

        if(m_operand->deepProperties().testFlag(RequiresCurrentItem))

            return me;

        else

            return m_operand;

    }

}

Expression::Ptr CurrentItemStore::typeCheck(const StaticContext::Ptr &context,

                                            const SequenceType::Ptr &reqType)

{

    return SingleContainer::typeCheck(newStaticContext(context), reqType);

}

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

{

    return visitor->visit(this);

}

const SourceLocationReflection *CurrentItemStore::actualReflection() const

{

    return m_operand->actualReflection();

}

Expression::Properties CurrentItemStore::properties() const

{

    return m_operand->properties() & (RequiresFocus | IsEvaluated | DisableElimination);

}

QT_END_NAMESPACE