/****************************************************************************

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** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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****************************************************************************/

#include <QVariant>

#include "qabstractxmlnodemodel_p.h"

#include "qitemmappingiterator_p.h"

#include "qitem_p.h"

#include "qxmlname.h"

#include "qxmlquery_p.h"

#include "qpullbridge_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

/*!

  \brief Bridges a QPatternist::SequenceIterator to QAbstractXmlPullProvider.

  \class QPatternist::PullBridge

  \internal

  \reentrant

  \ingroup xml-tools

  The approach of this class is rather straight forward since QPatternist::SequenceIterator

  and QAbstractXmlPullProvider are conceptually similar. While QPatternist::SequenceIterator only

  delivers top level items(since it's not an event stream, it's a list of items), PullBridge

  needs to recursively iterate the children of nodes too, which is achieved through the

  stack m_iterators.

 */

AbstractXmlPullProvider::Event PullBridge::next()

{

    m_index = m_iterators.top().second->next();

    if(!m_index.isNull())

    {

        Item item(m_index);

        if(item && item.isAtomicValue())

            m_current = AtomicValue;

        else

        {

            Q_ASSERT(item.isNode());

            switch(m_index.kind())

            {

                case QXmlNodeModelIndex::Attribute:

                {

                    m_current = Attribute;

                    break;

                }

                case QXmlNodeModelIndex::Comment:

                {

                    m_current = Comment;

                    break;

                }

                case QXmlNodeModelIndex::Element:

                {

                    m_iterators.push(qMakePair(StartElement, m_index.iterate(QXmlNodeModelIndex::AxisChild)));

                    m_current = StartElement;

                    break;

                }

                case QXmlNodeModelIndex::Document:

                {

                    m_iterators.push(qMakePair(StartDocument, m_index.iterate(QXmlNodeModelIndex::AxisChild)));

                    m_current = StartDocument;

                    break;

                }

                case QXmlNodeModelIndex::Namespace:

                {

                    m_current = Namespace;

                    break;

                }

                case QXmlNodeModelIndex::ProcessingInstruction:

                {

                    m_current = ProcessingInstruction;

                    break;

                }

                case QXmlNodeModelIndex::Text:

                {

                    m_current = Text;

                    break;

                }

            }

        }

    }

    else

    {

        if(m_iterators.isEmpty())

            m_current = EndOfInput;

        else

        {

            switch(m_iterators.top().first)

            {

                case StartOfInput:

                {

                    m_current = EndOfInput;

                    break;

                }

                case StartElement:

                {

                    m_current = EndElement;

                    m_iterators.pop();

                    break;

                }

                case StartDocument:

                {

                    m_current = EndDocument;

                    m_iterators.pop();

                    break;

                }

                default:

                {

                    Q_ASSERT_X(false, Q_FUNC_INFO,

                               "Invalid value.");

                    m_current = EndOfInput;

                }

            }

        }

    }

    return m_current;

}

AbstractXmlPullProvider::Event PullBridge::current() const

{

    return m_current;

}

QXmlNodeModelIndex PullBridge::index() const

{

    return m_index;

}

QSourceLocation PullBridge::sourceLocation() const

{

    return m_index.model()->sourceLocation(m_index);

}

QXmlName PullBridge::name() const

{

    return m_index.name();

}

QVariant PullBridge::atomicValue() const

{

    return QVariant();

}

QString PullBridge::stringValue() const

{

    return QString();

}

QHash<QXmlName, QString> PullBridge::attributes()

{

    Q_ASSERT(m_current == StartElement);

    QHash<QXmlName, QString> attributes;

    QXmlNodeModelIndex::Iterator::Ptr it = m_index.iterate(QXmlNodeModelIndex::AxisAttribute);

    QXmlNodeModelIndex index = it->next();

    while (!index.isNull()) {

        const Item attribute(index);

        attributes.insert(index.name(), index.stringValue());

        index = it->next();

    }

    return attributes;

}

QHash<QXmlName, QXmlItem> PullBridge::attributeItems()

{

    Q_ASSERT(m_current == StartElement);

    QHash<QXmlName, QXmlItem> attributes;

    QXmlNodeModelIndex::Iterator::Ptr it = m_index.iterate(QXmlNodeModelIndex::AxisAttribute);

    QXmlNodeModelIndex index = it->next();

    while (!index.isNull()) {

        const Item attribute(index);

        attributes.insert(index.name(), QXmlItem(index));

        index = it->next();

    }

    return attributes;

}

QT_END_NAMESPACE