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

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#include "qcommonsequencetypes_p.h"

#include "qatomicstring_p.h"

#include "qsimplecontentconstructor_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

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

{

}

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

{

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

    Item next(it->next());

    QString result;

    if(next)

    {

        result = next.stringValue();

        next = it->next();

    }

    else

        return Item();

    while(next)

    {

        result += QLatin1Char(' ');

        result += next.stringValue();

        next = it->next();

    }

    return AtomicString::fromValue(result);

}

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

{

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

    if(me.data() == this)

    {

        /* Optimization: if we will evaluate to a single string, we're not

         * necessary. */

        if(CommonSequenceTypes::ExactlyOneString->matches(m_operand->staticType()))

            return m_operand;

    }

    return me;

}

SequenceType::List SimpleContentConstructor::expectedOperandTypes() const

{

    SequenceType::List result;

    result.append(CommonSequenceTypes::ZeroOrMoreAtomicTypes);

    return result;

}

SequenceType::Ptr SimpleContentConstructor::staticType() const

{

    if(m_operand->staticType()->cardinality().allowsEmpty())

        return CommonSequenceTypes::ZeroOrOneString;

    else

        return CommonSequenceTypes::ExactlyOneString;

}

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

{

    return visitor->visit(this);

}

QT_END_NAMESPACE