/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qcommonsequencetypes_p.h"+
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#include "qcommonvalues_p.h"+
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#include "qitemmappingiterator_p.h"+
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#include "qpatternistlocale_p.h"+
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+
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#include "qtracefn_p.h"+
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+
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QT_BEGIN_NAMESPACE+
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+
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using namespace QPatternist;+
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+
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namespace QPatternist+
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{+
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    /**+
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     * @short TraceCallback is a MappingCallback and takes care of+
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     * the tracing of each individual item.+
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     *+
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     * Because Patternist must be thread safe, TraceFN creates a TraceCallback+
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     * each time the function is evaluated. In other words, TraceFN, which is+
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     * an Expression sub class, can't modify its members, but MappingCallback+
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     * does not have this limitation since it's created on a per evaluation basis.+
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     *+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     */+
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    class TraceCallback : public QSharedData+
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    {+
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    public:+
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        typedef QExplicitlySharedDataPointer<TraceCallback> Ptr;+
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+
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        inline TraceCallback(const QString &msg) : m_position(0),+
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                                                   m_msg(msg)+
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        {+
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        }+
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+
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        /**+
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         * Performs the actual tracing.+
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         */+
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        Item mapToItem(const Item &item,+
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                            const DynamicContext::Ptr &context)+
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        {+
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            QTextStream out(stderr);+
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            ++m_position;+
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            if(m_position == 1)+
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            {+
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                if(item)+
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                {+
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                    out << qPrintable(m_msg)+
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                        << " : "+
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                        << qPrintable(item.stringValue());+
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                }+
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                else+
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                {+
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                    out << qPrintable(m_msg)+
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                        << " : ("+
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                        << qPrintable(formatType(context->namePool(), CommonSequenceTypes::Empty))+
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                        << ")\n";+
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                    return Item();+
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                }+
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            }+
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            else+
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            {+
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                out << qPrintable(item.stringValue())+
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                    << '['+
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                    << m_position+
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                    << "]\n";+
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            }+
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+
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            return item;+
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        }+
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+
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    private:+
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        xsInteger m_position;+
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        const QString m_msg;+
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    };+
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}+
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+
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Item::Iterator::Ptr TraceFN::evaluateSequence(const DynamicContext::Ptr &context) const+
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{+
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    const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());+
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+
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    return makeItemMappingIterator<Item>(TraceCallback::Ptr(new TraceCallback(msg)),+
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                                              m_operands.first()->evaluateSequence(context),+
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                                              context);+
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}+
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+
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Item TraceFN::evaluateSingleton(const DynamicContext::Ptr &context) const+
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{+
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    const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());+
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    const Item item(m_operands.first()->evaluateSingleton(context));+
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+
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    return TraceCallback::Ptr(new TraceCallback(msg))->mapToItem(item, context);+
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}+
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+
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SequenceType::Ptr TraceFN::staticType() const+
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{+
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    return m_operands.first()->staticType();+
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}+
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+
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QT_END_NAMESPACE+
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