/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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** No Commercial Usage
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
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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_ProcessingInstructionConstructor_H
#define Patternist_ProcessingInstructionConstructor_H

#include "qpaircontainer_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Constructs an element node. This covers both computed and directly constructed
     * element 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 <fenglich@trolltech.com>
     * @ingroup Patternist_expressions
     */
    class ProcessingInstructionConstructor : public PairContainer
    {
    public:
        ProcessingInstructionConstructor(const Expression::Ptr &operand1,
                           const Expression::Ptr &operand2);

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

        virtual SequenceType::Ptr staticType() const;

        /**
         * Both arguments must of type @c xs:string. It is assumes that the first argument's
         * lexical space is @c xs:NCName.
         */
        virtual SequenceType::List expectedOperandTypes() const;

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

        virtual Properties properties() const;
    private:
        inline QXmlName evaluateTardata(const DynamicContext::Ptr &context) const;
        /**
         * Performs left-trimming only.
         *
         * @see QString::trimmed()
         */
        static inline QString leftTrimmed(const QString &input);

        QString data(const DynamicContext::Ptr &context) const;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif