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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_TemplatePattern_H

#define Patternist_TemplatePattern_H

#include "qtemplate_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    /**

     * @short Houses the data necessary for a template pattern.

     *

     * A template pattern is the match pattern, but have had each operand to @c

     * | separated out into a separate TemplatePattern. For instance, the

     * pattern <tt>a | b | c</tt>, becomes three separate TemplatePattern

     * instances.

     *

     * @see TemplateMode

     * @see Template

     * @author Frans Englich <frans.englich@nokia.com>

     * @ingroup Patternist_expressions

     * @since 4.5

     */

    class TemplatePattern : public QSharedData

    {

    public:

        typedef QExplicitlySharedDataPointer<TemplatePattern> Ptr;

        typedef QVector<Ptr> Vector;

        typedef int ID;

        inline TemplatePattern(const Expression::Ptr &matchPattern,

                               const PatternPriority pri,

                               const ID id,

                               const Template::Ptr templ);

        inline PatternPriority priority() const;

        inline const Expression::Ptr &matchPattern() const;

        inline void setMatchPattern(const Expression::Ptr &pattern);

        inline const Template::Ptr &templateTarget() const;

        inline ID id() const;

        /**

         * This ID is used to ensure that, as 6.4 Conflict Resolution for

         * Template Rules reads:

         *

         * "If the pattern contains multiple alternatives separated by |, then

         * the template rule is treated equivalently to a set of template

         * rules, one for each alternative. However, it is not an error if a

         * node matches more than one of the alternatives."

         *

         * For patterns separated by @c |, we have one Template instance for

         * each alternative, but they all have the same ID, hence if several

         * alternatives match, we don't flag it as an error if they have the

         * same ID.

         */

    private:

        Expression::Ptr m_matchPattern;

        PatternPriority m_priority;

        ID              m_id;

        Template::Ptr   m_templateTarget;

        Q_DISABLE_COPY(TemplatePattern)

    };

    TemplatePattern::TemplatePattern(const Expression::Ptr &matchPattern,

                                     const PatternPriority pri,

                                     const ID id,

                                     const Template::Ptr templ) : m_matchPattern(matchPattern)

                                                                , m_priority(pri)

                                                                , m_id(id)

                                                                , m_templateTarget(templ)

    {

        Q_ASSERT(m_matchPattern);

        Q_ASSERT(m_templateTarget);

    }

    const Expression::Ptr &TemplatePattern::matchPattern() const

    {

        return m_matchPattern;

    }

    void TemplatePattern::setMatchPattern(const Expression::Ptr &pattern)

    {

        m_matchPattern = pattern;

    }

    PatternPriority TemplatePattern::priority() const

    {

        return m_priority;

    }

    TemplatePattern::ID TemplatePattern::id() const

    {

        return m_id;

    }

    const Template::Ptr &TemplatePattern::templateTarget() const

    {

        return m_templateTarget;

    }

}

QT_END_NAMESPACE

QT_END_HEADER

#endif