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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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| ** 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_Literal_H |
| #define Patternist_Literal_H |
| |
| #include <private/qemptycontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Houses an AtomicValue, making it available as an Expression. |
| * |
| * This is not only literals that can be created via the XQuery syntax(strings and numbers), but |
| * all other atomic values, such as <tt>xs:date</tt> or <tt>xs:time</tt>. |
| * |
| * @see <a href="http://www.w3.org/TR/xquery/#id-literals">XQuery 1.0: An XML Query Language, |
| * 3.1.1 Literals</a> |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class Literal : public EmptyContainer |
| { |
| public: |
| /** |
| * Creates a Literal that represents @p item. |
| * |
| * @param item must be non-null and cannot be a QXmlNodeModelIndex. |
| */ |
| Literal(const Item &item); |
| |
| virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const; |
| virtual bool evaluateEBV(const DynamicContext::Ptr &context) const; |
| void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const; |
| |
| virtual SequenceType::Ptr staticType() const; |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| virtual ID id() const; |
| virtual QString description() const; |
| |
| /** |
| * @returns Expression::DisableElimination and Expression::IsEvaluated |
| */ |
| virtual Properties properties() const; |
| |
| /** |
| * Declaring the return value of this function a const reference, leads |
| * to crashes in patternistview, for a to me unknown reason. |
| */ |
| inline Item item() const |
| { |
| return m_item; |
| } |
| |
| private: |
| const Item m_item; |
| }; |
| |
| /** |
| * @short Creates a Literal that wraps @p item, and returns it. |
| * |
| * This simplifies code. Instead of writing: |
| * |
| * @code |
| * Expression::Ptr(new Literal(item)); |
| * @endcode |
| * |
| * One can write: |
| * |
| * @code |
| * wrapLiteral(item); |
| * @endcode |
| * |
| * This function is not declared static, because it breaks the build on |
| * at least aix-xlc-64. |
| * |
| * @relates Literal |
| */ |
| inline Expression::Ptr wrapLiteral(const Item &item, |
| const StaticContext::Ptr &context, |
| const SourceLocationReflection *const r) |
| { |
| Q_ASSERT(item); |
| |
| const Expression::Ptr retval(new Literal(item)); |
| context->addLocation(retval.data(), context->locationFor(r)); |
| |
| return retval; |
| } |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |