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#ifndef PatternistSDK_DebugExpressionFactory_H

#define PatternistSDK_DebugExpressionFactory_H

#include "Global.h"

#include "qexpressionfactory_p.h"

#include "qfunctionfactory_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternistSDK

{

    class ASTItem;

    /**

     * @short Is a QPatternist::ExpressionFactory, with the

     * difference that it provides the hooks for building from a tree of

     * debug data from the compiled expression.

     *

     * This tree can be retrieved via astTree(). The astTree() function

     * returns the AST built the last time createExpression() was called.

     *

     * @ingroup PatternistSDK

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

     */

    class Q_PATTERNISTSDK_EXPORT DebugExpressionFactory : public QPatternist::ExpressionFactory

    {

    public:

        DebugExpressionFactory() : m_ast(0)

        {

        }

        typedef QExplicitlySharedDataPointer<DebugExpressionFactory> Ptr;

        /**

         * Identical to ExpressionFactory::createExpression() with the difference

         * that it builds an ASTItem tree which can be accessed via astTree().

         */

        virtual QPatternist::Expression::Ptr createExpression(QIODevice *const expr,

                                                              const QPatternist::StaticContext::Ptr &context,

                                                              const QXmlQuery::QueryLanguage lang,

                                                              const QPatternist::SequenceType::Ptr &requiredType,

                                                              const QUrl &queryURI,

                                                              const QXmlName &initialTemplateName);

        /**

         * @returns an ASTItem tree built for the last created expression,

         * via createExpression().

         */

        virtual ASTItem *astTree() const;

        /**

         * @returns a list containing string representations of all available

         * functions in Patternist. Each QString in the returned QStringList

         * is a function synopsis for human consumption.

         */

        static QStringList availableFunctionSignatures();

    protected:

        /**

         * Performs the ASTItem tree building.

         */

        virtual void processTreePass(const QPatternist::Expression::Ptr &tree,

                                     const CompilationStage stage);

        void processTemplateRule(const QPatternist::Expression::Ptr &body,

                                 const QPatternist::TemplatePattern::Ptr &pattern,

                                 const QXmlName &mode,

                                 const TemplateCompilationStage stage);

        void processNamedTemplate(const QXmlName &name,

                                  const QPatternist::Expression::Ptr &body,

                                  const TemplateCompilationStage stage);

    private:

        static ASTItem *buildASTTree(const QPatternist::Expression::Ptr &expr,

                                     ASTItem *const parent,

                                     const QPatternist::SequenceType::Ptr &reqType);

        ASTItem *m_ast;

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif

// vim: et:ts=4:sw=4:sts=4