source: trunk/src/xmlpatterns/expr/qcastas.cpp@ 609

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#include "qitem_p.h"
#include "qbuiltintypes_p.h"
#include "qcardinalityverifier_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qgenericsequencetype_p.h"
#include "qliteral_p.h"
#include "qpatternistlocale_p.h"
#include "qnamespaceresolver_p.h"
#include "qqnameconstructor_p.h"
#include "qqnamevalue_p.h"
#include "qatomicstring_p.h"
#include "qvalidationerror_p.h"

#include "qcastas_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

CastAs::CastAs(const Expression::Ptr &source,
               const SequenceType::Ptr &tType) : SingleContainer(source),
                                                 m_targetType(tType)
{
    Q_ASSERT(source);
    Q_ASSERT(tType);
    Q_ASSERT(!tType->cardinality().allowsMany());
    Q_ASSERT(tType->itemType()->isAtomicType());
}

Item CastAs::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    Q_ASSERT(context);
    const Item val(m_operand->evaluateSingleton(context));

    if(val)
        return cast(val, context);
    else
    {
        /* No item supplied, let's handle the cardinality part. */

        if(m_targetType->cardinality().allowsEmpty())
            return Item();
        else
        {
            Q_ASSERT(context);
            context->error(QtXmlPatterns::tr("Type error in cast, expected %1, "
                                             "received %2.")
                           .arg(formatType(Cardinality::exactlyOne()))
                           .arg(formatType(Cardinality::empty())),
                           ReportContext::XPTY0004, this);
            return Item();
        }
    }
}

Expression::Ptr CastAs::typeCheck(const StaticContext::Ptr &context,
                                  const SequenceType::Ptr &reqType)