source: trunk/src/xmlpatterns/acceltree/qacceltreebuilder_p.h@ 561

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

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

QT_BEGIN_HEADER

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 <[email protected]>
     */
    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.cpp"
}

QT_END_NAMESPACE

QT_END_HEADER

#endif