/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** contained in the Technology Preview License Agreement accompanying
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****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_CommentConstructor_H
#define Patternist_CommentConstructor_H

#include "qsinglecontainer_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Constructs a comment node. This covers both computed and directly constructed
     * text nodes.
     *
     * @see <a href="http://www.w3.org/TR/xquery/#id-constructors">XQuery
     * 1.0: An XML Query Language, 3.7 Constructors</a>
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class CommentConstructor : public SingleContainer
    {
    public:
        CommentConstructor(const Expression::Ptr &operand);

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;

        virtual SequenceType::Ptr staticType() const;

        /**
         * The first operand must be exactly one @c xs:string.
         */
        virtual SequenceType::List expectedOperandTypes() const;

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        virtual Properties properties() const;

    private:
        inline QString evaluateContent(const DynamicContext::Ptr &context) const;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif