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Diffstat (limited to 'src/xmlpatterns/expr/qliteral_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qliteral_p.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qliteral_p.h b/src/xmlpatterns/expr/qliteral_p.h new file mode 100644 index 0000000..3da667d --- /dev/null +++ b/src/xmlpatterns/expr/qliteral_p.h @@ -0,0 +1,148 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtXmlPatterns module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// 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 "qemptycontainer_p.h" + +QT_BEGIN_HEADER + +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 <fenglich@trolltech.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 + +QT_END_HEADER + +#endif |