| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| ** GNU Lesser General Public License Usage |
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| ** General Public License version 3 as published by the Free Software |
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| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
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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_EmptySequence_H |
| #define Patternist_EmptySequence_H |
| |
| #include <private/qemptycontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Implements the value instance of empty sequence: <tt>()</tt>. |
| * |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_xdm |
| */ |
| class EmptySequence : public EmptyContainer |
| { |
| public: |
| /** |
| * @short Creates an EmptySequence that is a replacement for @p |
| * replacementFor. |
| * |
| * @see EmptySequence() |
| */ |
| static Expression::Ptr create(const Expression *const replacementFor, |
| const StaticContext::Ptr &context); |
| |
| |
| /** |
| * @short Creates an instance of EmptySequence. |
| * |
| * @note In most cases create() should be used, since it takes care of |
| * adjusting source location annotations. |
| * |
| * @see create() |
| */ |
| inline EmptySequence() |
| { |
| } |
| |
| virtual QString stringValue() const; |
| |
| /** |
| * @returns always an empty iterator, an instance of EmptyIterator. |
| */ |
| virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
| |
| /** |
| * @returns always @c null. |
| */ |
| virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
| |
| /** |
| * Does nothing. |
| */ |
| virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &) const; |
| |
| /** |
| * @returns always @c false. |
| */ |
| virtual bool evaluateEBV(const DynamicContext::Ptr &context) const; |
| |
| /** |
| * @returns always CommonSequenceTypes::Empty |
| */ |
| virtual ItemType::Ptr type() const; |
| |
| /** |
| * @returns always CommonSequenceTypes::Empty |
| */ |
| virtual SequenceType::Ptr staticType() const; |
| |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| virtual ID id() const; |
| virtual Properties properties() const; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |