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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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| ** Alternatively, this file may be used under the terms of the GNU |
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| ** 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_ContextItem_H |
| #define Patternist_ContextItem_H |
| |
| #include <private/qemptycontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Implements the context item, the dot: <tt>.</tt>. |
| * |
| * @see <a href="http://www.w3.org/TR/xpath20/#id-context-item-expression">XML Path Language |
| * (XPath) 2.0, 3.1.4 Context Item Expression</a> |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class ContextItem : public EmptyContainer |
| { |
| public: |
| /** |
| * @p expr is possibly used for error reporting. If this context item has been |
| * created implicitly, such as for the expression <tt>fn:string()</tt>, @p expr |
| * should be passed a valid pointer to the Expression that this context |
| * item is generated for. |
| */ |
| inline ContextItem(const Expression::Ptr &expr = Expression::Ptr()) : m_expr(expr) |
| { |
| } |
| |
| virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; |
| virtual SequenceType::Ptr staticType() const; |
| |
| /** |
| * @returns always DisableElimination and RequiresContextItem |
| */ |
| virtual Expression::Properties properties() const; |
| |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| |
| /** |
| * Overridden to store a pointer to StaticContext::contextItemType(). |
| */ |
| virtual Expression::Ptr compress(const StaticContext::Ptr &context); |
| |
| /** |
| * Overridden to store a pointer to StaticContext::contextItemType(). |
| */ |
| virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType); |
| |
| /** |
| * @returns always IDContextItem |
| */ |
| virtual ID id() const; |
| |
| /** |
| * @returns always BuiltinTypes::item; |
| */ |
| virtual ItemType::Ptr expectedContextItemType() const; |
| |
| virtual const SourceLocationReflection *actualReflection() const; |
| virtual void announceFocusType(const ItemType::Ptr &type); |
| |
| private: |
| ItemType::Ptr m_itemType; |
| const Expression::Ptr m_expr; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |