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42 #include "qcommonsequencetypes_p.h"
43 #include "qcommonvalues_p.h"
44 #include "qitemmappingiterator_p.h"
45 #include "qpatternistlocale_p.h"
47 #include "qtracefn_p.h"
51 using namespace QPatternist;
56 * @short TraceCallback is a MappingCallback and takes care of
57 * the tracing of each individual item.
59 * Because Patternist must be thread safe, TraceFN creates a TraceCallback
60 * each time the function is evaluated. In other words, TraceFN, which is
61 * an Expression sub class, can't modify its members, but MappingCallback
62 * does not have this limitation since it's created on a per evaluation basis.
64 * @author Frans Englich <frans.englich@nokia.com>
66 class TraceCallback : public QSharedData
69 typedef QExplicitlySharedDataPointer<TraceCallback> Ptr;
71 inline TraceCallback(const QString &msg) : m_position(0),
77 * Performs the actual tracing.
79 Item mapToItem(const Item &item,
80 const DynamicContext::Ptr &context)
82 QTextStream out(stderr);
88 out << qPrintable(m_msg)
90 << qPrintable(item.stringValue());
94 out << qPrintable(m_msg)
96 << qPrintable(formatType(context->namePool(), CommonSequenceTypes::Empty))
103 out << qPrintable(item.stringValue())
113 xsInteger m_position;
118 Item::Iterator::Ptr TraceFN::evaluateSequence(const DynamicContext::Ptr &context) const
120 const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
122 return makeItemMappingIterator<Item>(TraceCallback::Ptr(new TraceCallback(msg)),
123 m_operands.first()->evaluateSequence(context),
127 Item TraceFN::evaluateSingleton(const DynamicContext::Ptr &context) const
129 const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
130 const Item item(m_operands.first()->evaluateSingleton(context));
132 return TraceCallback::Ptr(new TraceCallback(msg))->mapToItem(item, context);
135 SequenceType::Ptr TraceFN::staticType() const
137 return m_operands.first()->staticType();