/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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//+
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//  W A R N I N G+
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//  -------------+
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//+
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// This file is not part of the Qt API.  It exists purely as an+
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// implementation detail.  This header file may change from version to+
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// version without notice, or even be removed.+
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//+
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// We mean it.+
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+
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#ifndef Patternist_AxisStep_H+
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#define Patternist_AxisStep_H+
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+
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#include "qemptycontainer_p.h"+
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#include "qitem_p.h"+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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namespace QPatternist+
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{+
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    /**+
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     * @short A step in a path expression that with an axis and a node test evaluates+
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     * to a sequence of nodes from the context item.+
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     *+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     * @ingroup Patternist_expressions+
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     */+
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    class Q_AUTOTEST_EXPORT AxisStep : public EmptyContainer+
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    {+
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    public:+
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        AxisStep(const QXmlNodeModelIndex::Axis axis,+
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                 const ItemType::Ptr &nodeTest);+
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+
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        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;+
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+
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        /**+
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         * Returns @p node if it matches the node test this step is using, otherwise @c null.+
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         */+
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        inline Item mapToItem(const QXmlNodeModelIndex &node,+
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                              const DynamicContext::Ptr &context) const;+
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+
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        virtual SequenceType::List expectedOperandTypes() const;+
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        virtual SequenceType::Ptr staticType() const;+
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+
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        /**+
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         * Rewrites to ParentNodeAxis, if possible.+
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         */+
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        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,+
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                                          const SequenceType::Ptr &reqType);+
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+
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        /**+
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         * @returns always BuiltinTypes::node;+
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         */+
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        virtual ItemType::Ptr expectedContextItemType() const;+
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+
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        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;+
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+
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        virtual Properties properties() const;+
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+
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        /**+
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         * @returns the axis this step is using.+
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         */+
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        QXmlNodeModelIndex::Axis axis() const;+
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+
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        /**+
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         * @returns the node test this step is using.+
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         */+
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        inline ItemType::Ptr nodeTest() const+
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        {+
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            return m_nodeTest;+
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        }+
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+
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        void setNodeTest(const ItemType::Ptr &nev)+
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        {+
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            m_nodeTest = nev;+
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        }+
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+
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        /**+
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         * @short Prints the EBNF name corresponding to @p axis.+
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         *+
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         * For instance, for QXmlNodeModelIndex::Child, "child" is returned.+
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         *+
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         * Apart from being used in this class, it is used in the SDK.+
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         */+
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        static QString axisName(const QXmlNodeModelIndex::Axis axis);+
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+
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        virtual ID id() const;+
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        virtual PatternPriority patternPriority() const;+
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+
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        inline void setAxis(const QXmlNodeModelIndex::Axis newAxis);+
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+
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    private:+
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        typedef QExplicitlySharedDataPointer<const AxisStep> ConstPtr;+
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+
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        static const QXmlNodeModelIndex::NodeKind s_whenAxisNodeKindEmpty[];+
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+
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        /**+
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         * @returns @c true when the axis @p axis and a node test testing node of+
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         * type @p nodeKind always produces an empty sequence. One such example+
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         * is <tt>attribute::comment()</tt>.+
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         */+
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        static bool isAlwaysEmpty(const QXmlNodeModelIndex::Axis axis,+
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                                  const QXmlNodeModelIndex::NodeKind nodeKind);+
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+
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        /**+
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         * The reason this variable is mutable, is that in the case of XSL-T patterns,+
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         * we do quite some reordering.+
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         */+
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        QXmlNodeModelIndex::Axis    m_axis;+
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        ItemType::Ptr               m_nodeTest;+
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    };+
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+
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    void AxisStep::setAxis(const QXmlNodeModelIndex::Axis newAxis)+
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    {+
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        m_axis = newAxis;+
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    }+
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+
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}+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif+
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