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Diffstat (limited to 'src/xmlpatterns/expr/qgeneralcomparison_p.h')
| -rw-r--r-- | src/xmlpatterns/expr/qgeneralcomparison_p.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/xmlpatterns/expr/qgeneralcomparison_p.h b/src/xmlpatterns/expr/qgeneralcomparison_p.h new file mode 100644 index 0000000..cc83e22 --- /dev/null +++ b/src/xmlpatterns/expr/qgeneralcomparison_p.h @@ -0,0 +1,136 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@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_GeneralComparison_H +#define Patternist_GeneralComparison_H + +#include "qatomiccomparator_p.h" +#include "qpaircontainer_p.h" +#include "qcomparisonplatform_p.h" + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +namespace QPatternist +{ + + /** + * @short Implements XPath 2.0's general comparions, such as the <tt>=</tt> operator. + * + * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform + * must access members of GeneralComparison. + * + * @see <a href="http://www.w3.org/TR/xpath20/#id-general-comparisons">XML Path Language + * (XPath) 2.0, 3.5.2 General Comparisons</a> + * @author Frans Englich <frans.englich@nokia.com> + * @ingroup Patternist_expressions + */ + class GeneralComparison : public PairContainer, + public ComparisonPlatform<GeneralComparison, + true /* We want to report errors. */, + AtomicComparator::AsGeneralComparison> + { + public: + GeneralComparison(const Expression::Ptr &op1, + const AtomicComparator::Operator op, + const Expression::Ptr &op2, + const bool isBackwardsCompat = false); + + virtual bool evaluateEBV(const DynamicContext::Ptr &) const; + virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, + const SequenceType::Ptr &reqType); + + virtual SequenceType::List expectedOperandTypes() const; + virtual SequenceType::Ptr staticType() const; + + virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; + + /** + * @returns always IDGeneralComparison + */ + virtual ID id() const; + + virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const; + + /** + * @returns the operator that this GeneralComparison is using. + */ + inline AtomicComparator::Operator operatorID() const + { + return m_operator; + } + + /** + * Overridden to optimize case-insensitive compares. + */ + virtual Expression::Ptr compress(const StaticContext::Ptr &context); + + private: + static inline void updateType(ItemType::Ptr &type, + const Expression::Ptr &source); + AtomicComparator::Ptr fetchGeneralComparator(Expression::Ptr &op1, + Expression::Ptr &op2, + const ReportContext::Ptr &context) const; + bool generalCompare(const Item &op1, + const Item &op2, + const DynamicContext::Ptr &context) const; + + const AtomicComparator::Operator m_operator; + const bool m_isBackwardsCompat; + }; +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif |