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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_AccelTreeBuilder_H
#define Patternist_AccelTreeBuilder_H

#include <QSet>
#include <QStack>

#include <private/qxmlutils_p.h>
#include <private/qacceltree_p.h>
#include <private/qbuiltintypes_p.h>
#include <private/qcompressedwhitespace_p.h>
#include <private/qnamepool_p.h>
#include <private/qnodebuilder_p.h>
#include <private/qreportcontext_p.h>
#include <private/qsourcelocationreflection_p.h>
#include <private/qpatternistlocale_p.h>
#include <QtDebug>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Builds an AccelTree from a stream of XML/Item events
     * received through the NodeBuilder interface.
     *
     * If FromDocument is @c true, it is assumed that AccelTreeBuilder is fed
     * events from an XML document, otherwise it is assumed the events
     * are from node constructor expressions.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     */
    template<bool FromDocument>
    class AccelTreeBuilder : public NodeBuilder
                           , public SourceLocationReflection
    {
    public:
        typedef QExplicitlySharedDataPointer<AccelTreeBuilder> Ptr;

        /**
         * Describes the memory relevant features the builder shall support.
         */
        enum Feature
        {
            NoneFeature,                ///< No special features are enabled.
            SourceLocationsFeature = 1  ///< The accel tree builder will store source locations for each start element.
        };
        Q_DECLARE_FLAGS(Features, Feature)

        /**
         * @param context may be @c null.
         */
        AccelTreeBuilder(const QUrl &docURI,
                         const QUrl &baseURI,
                         const NamePool::Ptr &np,
                         ReportContext *const context,
                         Features features = NoneFeature);
        virtual void startDocument();
        virtual void endDocument();
        virtual void startElement(const QXmlName &name);
        void startElement(const QXmlName &name, qint64 line, qint64 column);
        virtual void endElement();
        virtual void attribute(const QXmlName &name, const QStringRef &value);
        virtual void characters(const QStringRef &ch);
        virtual void whitespaceOnly(const QStringRef &ch);
        virtual void processingInstruction(const QXmlName &target,
                                           const QString &data);
        virtual void namespaceBinding(const QXmlName &nb);
        virtual void comment(const QString &content);
        virtual void item(const Item &it);

        virtual QAbstractXmlNodeModel::Ptr builtDocument();
        virtual NodeBuilder::Ptr create(const QUrl &baseURI) const;
        virtual void startOfSequence();
        virtual void endOfSequence();

        inline AccelTree::Ptr builtDocument() const
        {
            return m_document;
        }

        virtual void atomicValue(const QVariant &value);

        virtual const SourceLocationReflection *actualReflection() const;
        virtual QSourceLocation sourceLocation() const;

    private:
        inline void startStructure();

        inline AccelTree::PreNumber currentDepth() const
        {
            return m_ancestors.count() -1;
        }

        inline AccelTree::PreNumber currentParent() const
        {
            return m_ancestors.isEmpty() ? -1 : m_ancestors.top();
        }

        enum Constants
        {
            DefaultNodeStackSize = 10,
            SizeIsEmpty = 0
        };

        AccelTree::PreNumber            m_preNumber;
        bool                            m_isPreviousAtomic;
        bool                            m_hasCharacters;
        /**
         * Whether m_characters has been run through
         * CompressedWhitespace::compress().
         */
        bool                            m_isCharactersCompressed;
        QString                         m_characters;
        NamePool::Ptr                   m_namePool;
        AccelTree::Ptr                  m_document;
        QStack<AccelTree::PreNumber>    m_ancestors;
        QStack<AccelTree::PreNumber>    m_size;

        /** If we have already commenced a document, we don't want to
         * add more document nodes. We keep track of them with this
         * counter, which ensures that startDocument() and endDocument()
         * are skipped consistently. */
        AccelTree::PreNumber            m_skippedDocumentNodes;

        /**
         * All attribute values goes through this set such that we store only
         * one QString for identical attribute values.
         */
        QSet<QString>                   m_attributeCompress;
        const QUrl                      m_documentURI;
        /**
         * We don't store a reference pointer here because then we get a
         * circular reference with GenericDynamicContext, when it stores us as
         * a member.
         */
        ReportContext *const            m_context;

        Features                        m_features;
    };

    Q_DECLARE_OPERATORS_FOR_FLAGS(AccelTreeBuilder<true>::Features)
    Q_DECLARE_OPERATORS_FOR_FLAGS(AccelTreeBuilder<false>::Features)

#include "qacceltreebuilder_tpl_p.h"
}

QT_END_NAMESPACE

#endif
