/****************************************************************************
**
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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 "qtypechecker_p.h"

#include "qtreatas_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

TreatAs::TreatAs(const Expression::Ptr &operand,
                 const SequenceType::Ptr &reqType) : SingleContainer(operand),
                                                     m_reqType(reqType)
{
    Q_ASSERT(reqType);
}

Expression::Ptr TreatAs::typeCheck(const StaticContext::Ptr &context,
                                   const SequenceType::Ptr &reqType)
{
    Q_ASSERT(context);
    Q_ASSERT(reqType);

    /* Apply function conversion with the special error code XPDY0050. After that, we
     * let the regular typeCheck() function be invoked on the operand before we rewrite
     * to it. Hence is applyFunctionConversion() called twice, which doesn't break anything,
     * but indeed is redundant. */
    const Expression::Ptr treated(TypeChecker::applyFunctionConversion(m_operand,
                                                                       m_reqType,
                                                                       context,
                                                                       ReportContext::XPDY0050));
    return treated->typeCheck(context, reqType);
}

ExpressionVisitorResult::Ptr TreatAs::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

SequenceType::Ptr TreatAs::staticType() const
{
    return m_reqType;
}

SequenceType::List TreatAs::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ZeroOrMoreItems);
    return result;
}

QT_END_NAMESPACE