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