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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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****************************************************************************/

#include "qatomictype_p.h"

#include "qbuiltintypes_p.h"

#include "qcommonsequencetypes_p.h"

#include "qgenericsequencetype_p.h"

#include "qsequencemappingiterator_p.h"

#include "qatomizer_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

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

{

}

Item::Iterator::Ptr Atomizer::mapToSequence(const Item &item, const DynamicContext::Ptr &) const

{

    /* Function & Operators, 2.4.2 fn:data, says "If the node does not have a

     * typed value an error is raised [err:FOTY0012]."

     * When does a node not have a typed value? */

    Q_ASSERT(item);

    return item.sequencedTypedValue();

}

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

{

    return makeSequenceMappingIterator<Item>(ConstPtr(this),

                                             m_operand->evaluateSequence(context),

                                             context);

}

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

{

    const Item item(m_operand->evaluateSingleton(context));

    if(!item) /* Empty is allowed, cardinality is considered '?' */

        return Item();

    const Item::Iterator::Ptr it(mapToSequence(item, context));

    Q_ASSERT_X(it, Q_FUNC_INFO, "A valid QAbstractXmlForwardIterator must always be returned.");

    Item result(it->next());

    Q_ASSERT_X(!it->next(), Q_FUNC_INFO,

               "evaluateSingleton should never be used if the cardinality is two or more");

    return result;

}

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

                                    const SequenceType::Ptr &reqType)

{

    /* Compress -- the earlier the better. */

    if(BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(m_operand->staticType()->itemType()))

        return m_operand->typeCheck(context, reqType);

    return SingleContainer::typeCheck(context, reqType);

}

SequenceType::Ptr Atomizer::staticType() const

{

    const SequenceType::Ptr opt(m_operand->staticType());

    return makeGenericSequenceType(opt->itemType()->atomizedType(),

                                   opt->cardinality());

}

SequenceType::List Atomizer::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    return result;

}

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

{

    return visitor->visit(this);

}

const SourceLocationReflection *Atomizer::actualReflection() const

{

    return m_operand->actualReflection();

}

QT_END_NAMESPACE