/****************************************************************************+
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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_Path_H+
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#define Patternist_Path_H+
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+
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#include "qpaircontainer_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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    /**+
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     * @short Implements the path expression, containing two steps, such as in <tt>html/body</tt>.+
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     *+
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     * @see <a href="http://www.w3.org/TR/xquery/#id-path-expressions">XQuery 1.0: An+
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     * XML Query Language, 3.2 Path Expressions</a>+
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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 Path : public PairContainer+
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    {+
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    public:+
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        enum Kind+
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        {+
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            /**+
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             * This Path is a plain old path expression as found in XPath.+
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             * Sorting is performed, and atomics are disallowed as left+
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             * operand.+
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             */+
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            RegularPath = 1,+
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+
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            /**+
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             * This Path emulates an @c xsl:for-each instruction. This means no+
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             * sorting of result, and atomics are allowed as left operand.+
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             */+
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            XSLTForEach,+
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+
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            /**+
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             * This Path performs the iteration in an @c xsl:apply-templates+
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             * instruction. This means sorting, and atomics are disallowed+
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             * as left operand.+
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             */+
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            ForApplyTemplate+
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        };+
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+
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        Path(const Expression::Ptr &operand1,+
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             const Expression::Ptr &operand2,+
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             const Kind kind = RegularPath);+
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+
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        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;+
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        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;+
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        virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;+
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        inline Item::Iterator::Ptr mapToSequence(const Item &item,+
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                                                 const DynamicContext::Ptr &context) const;+
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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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        virtual SequenceType::List expectedOperandTypes() const;+
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+
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        /**+
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         * @returns the static type of the last step where the cardinality is multiplied with+
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         * the cardinality of the first step's cardinality.+
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         */+
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        virtual SequenceType::Ptr staticType() 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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        virtual Expression::Ptr compress(const StaticContext::Ptr &context);+
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+
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        /**+
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         * @returns the item type of the last step's static type.+
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         */+
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        virtual ItemType::Ptr newFocusType() const;+
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+
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        virtual ID id() const;+
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+
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        inline void setLast();+
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+
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        inline Kind kind() const+
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        {+
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            return m_kind;+
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        }+
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+
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    private:+
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        typedef QExplicitlySharedDataPointer<const Path> ConstPtr;+
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+
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        /**+
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         * One might think this block exists for preventing multiple+
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         * NodeSortExpressions to be created. However, that is not an issue,+
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         * since NodeSortExpression optimizes this away anyway.+
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         *+
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         * The real reason is to avoid infinite recursion. When our typeCheck()+
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         * forwards on the type check to the just created+
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         * NodeSortExpression, it in turn calls typeCheck() on its child, which+
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         * is this Path. Rince and repeat.+
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         *+
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         * We only create node sorts when we're a regular path expression, and+
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         * not when standing in as a generic map expression. */+
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        bool        m_hasCreatedSorter;+
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+
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        /**+
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         * Whether this path is the step. For instance, in <tt>a/b/c</tt>, the+
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         * last path has @c c as the right operand.+
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         */+
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        bool        m_isLast;+
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+
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        bool        m_checkXPTY0018;+
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        const Kind  m_kind;+
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    };+
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+
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    void Path::setLast()+
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    {+
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        m_isLast = true;+
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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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