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**

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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

#include "qatomicstring_p.h"

#include "qcommonsequencetypes_p.h"

#include "qxsltsimplecontentconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

XSLTSimpleContentConstructor::XSLTSimpleContentConstructor(const Expression::Ptr &source) : SimpleContentConstructor(source)

{

}

QString XSLTSimpleContentConstructor::processItem(const Item &item,

                                                  bool &discard,

                                                  bool &isText)

{

    if(item.isNode())

    {

        isText = (item.asNode().kind() == QXmlNodeModelIndex::Text);

        if(isText)

        {

            const QString value(item.stringValue());

            /* "1. Zero-length text nodes in the sequence are discarded." */

            discard = value.isEmpty();

            return value;

        }

        else

        {

            Item::Iterator::Ptr it(item.sequencedTypedValue()); /* Atomic values. */

            Item next(it->next());

            QString result;

            if(next)

                result = next.stringValue();

            next = it->next();

            while(next)

            {

                result += next.stringValue();

                result += QLatin1Char(' ');

                next = it->next();

            }

            return result;

        }

    }

    else

    {

        discard = false;

        isText = false;

        return item.stringValue();

    }

}

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

{

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

    Item next(it->next());

    QString result;

    bool previousIsText = false;

    bool discard = false;

    if(next)

    {

        const QString unit(processItem(next, discard, previousIsText));

        if(!discard)

            result = unit;

        next = it->next();

    }

    else

        return Item();

    while(next)

    {

        bool currentIsText = false;

        const QString unit(processItem(next, discard, currentIsText));

        if(!discard)

        {

            /* "Adjacent text nodes in the sequence are merged into a single text

             * node." */

            if(previousIsText && currentIsText)

                ;

            else

                result += QLatin1Char(' ');

            result += unit;

        }

        next = it->next();

        previousIsText = currentIsText;

    }

    return AtomicString::fromValue(result);

}

SequenceType::List XSLTSimpleContentConstructor::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreItems);

    return result;

}

SequenceType::Ptr XSLTSimpleContentConstructor::staticType() const

{

    return CommonSequenceTypes::ZeroOrOneString;

}

QT_END_NAMESPACE