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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qitemmappingiterator_p.h"
#include "qpatternistlocale_p.h"
#include "qtracefn_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
namespace QPatternist
{
/**
* @short TraceCallback is a MappingCallback and takes care of
* the tracing of each individual item.
*
* Because Patternist must be thread safe, TraceFN creates a TraceCallback
* each time the function is evaluated. In other words, TraceFN, which is
* an Expression sub class, can't modify its members, but MappingCallback
* does not have this limitation since it's created on a per evaluation basis.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class TraceCallback : public QSharedData
{
public:
typedef QExplicitlySharedDataPointer<TraceCallback> Ptr;
inline TraceCallback(const QString &msg) : m_position(0),
m_msg(msg)
{
}
/**
* Performs the actual tracing.
*/
Item mapToItem(const Item &item,
const DynamicContext::Ptr &context)
{
QTextStream out(stderr);
++m_position;
if(m_position == 1)
{
if(item)
{
out << qPrintable(m_msg)
<< " : "
<< qPrintable(item.stringValue());
}
else
{
out << qPrintable(m_msg)
<< " : ("
<< qPrintable(formatType(context->namePool(), CommonSequenceTypes::Empty))
<< ")\n";
return Item();
}
}
else
{
out << qPrintable(item.stringValue())
<< '['
<< m_position
<< "]\n";
}
return item;
}
private:
xsInteger m_position;
const QString m_msg;
};
}
Item::Iterator::Ptr TraceFN::evaluateSequence(const DynamicContext::Ptr &context) const
{
const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
return makeItemMappingIterator<Item>(TraceCallback::Ptr(new TraceCallback(msg)),
m_operands.first()->evaluateSequence(context),
context);
}
Item TraceFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
const Item item(m_operands.first()->evaluateSingleton(context));
return TraceCallback::Ptr(new TraceCallback(msg))->mapToItem(item, context);
}
SequenceType::Ptr TraceFN::staticType() const
{
return m_operands.first()->staticType();
}
QT_END_NAMESPACE
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