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| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
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| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| |
| #ifndef Patternist_ExternalVariableReference_H |
| #define Patternist_ExternalVariableReference_H |
| |
| #include <private/qemptycontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short A reference to an external variable. |
| * |
| * ExternalVariableReference does not sub-class VariableReference, because it |
| * works differently from how sub-classes of VariableReference do. This class |
| * uses DynamicContext::externalVariableLoader() for retrieving its value, while |
| * a VariableReference sub-class uses slots in the DynamicContext. |
| * |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class ExternalVariableReference : public EmptyContainer |
| { |
| public: |
| ExternalVariableReference(const QXmlName &name, |
| const SequenceType::Ptr &type); |
| |
| virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; |
| virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; |
| virtual bool evaluateEBV(const DynamicContext::Ptr &context) const; |
| |
| virtual SequenceType::Ptr staticType() const; |
| |
| /** |
| * @returns always DisableElimination |
| */ |
| virtual Expression::Properties properties() const; |
| |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| |
| private: |
| const QXmlName m_name; |
| const SequenceType::Ptr m_seqType; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |