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#include "qcommonsequencetypes_p.h"

#include "qgenericsequencetype_p.h"

#include "qitemmappingiterator_p.h"

#include "qquantifiedexpression_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

QuantifiedExpression::QuantifiedExpression(const VariableSlotID varSlot,

                                           const Operator quantifier,

                                           const Expression::Ptr &inClause,

                                           const Expression::Ptr &testExpression)

                                           : PairContainer(inClause, testExpression),

                                             m_varSlot(varSlot),

                                             m_quantifier(quantifier)

{

    Q_ASSERT(quantifier == Some || quantifier == Every);

}

Item QuantifiedExpression::mapToItem(const Item &item,

                                          const DynamicContext::Ptr &context) const

{

    context->setRangeVariable(m_varSlot, item);

    return item;

}

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

{

    const Item::Iterator::Ptr it(makeItemMappingIterator<Item>(ConstPtr(this),

                                                               m_operand1->evaluateSequence(context),

                                                               context));

    Item item(it->next());

    if(m_quantifier == Some)

    {

        while(item)

        {

            if(m_operand2->evaluateEBV(context))

                return true;

            else

                item = it->next();

        };

        return false;

    }

    else

    {

        Q_ASSERT(m_quantifier == Every);

        while(item)

        {

            if(m_operand2->evaluateEBV(context))

                item = it->next();

            else

                return false;

        }

        return true;

    }

}

QString QuantifiedExpression::displayName(const Operator quantifier)

{

    if(quantifier == Some)

        return QLatin1String("some");

    else

    {

        Q_ASSERT(quantifier == Every);

        return QLatin1String("every");

    }

}

SequenceType::Ptr QuantifiedExpression::staticType() const

{

    return CommonSequenceTypes::ExactlyOneBoolean;

}

SequenceType::List QuantifiedExpression::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    result.append(CommonSequenceTypes::EBV);

    return result;

}

QuantifiedExpression::Operator QuantifiedExpression::operatorID() const

{

    return m_quantifier;

}

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

{

    return visitor->visit(this);

}

QT_END_NAMESPACE