1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2015 The Qt Company Ltd. 4 ** Contact: http://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtXmlPatterns module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see http://www.qt.io/terms-conditions. For further 15 ** information use the contact form at http://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 2.1 or version 3 as published by the Free 20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22 ** following information to ensure the GNU Lesser General Public License 23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25 ** 26 ** As a special exception, The Qt Company gives you certain additional 27 ** rights. These rights are described in The Qt Company LGPL Exception 28 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29 ** 30 ** GNU General Public License Usage 31 ** Alternatively, this file may be used under the terms of the GNU 32 ** General Public License version 3.0 as published by the Free Software 33 ** Foundation and appearing in the file LICENSE.GPL included in the 34 ** packaging of this file. Please review the following information to 35 ** ensure the GNU General Public License version 3.0 requirements will be 36 ** met: http://www.gnu.org/copyleft/gpl.html. 37 ** 38 ** $QT_END_LICENSE$ 39 ** 40 ****************************************************************************/ 41 42 // 43 // W A R N I N G 44 // ------------- 45 // 46 // This file is not part of the Qt API. It exists purely as an 47 // implementation detail. This header file may change from version to 48 // version without notice, or even be removed. 49 // 50 // We mean it. 51 52 #ifndef Patternist_GeneralComparison_H 53 #define Patternist_GeneralComparison_H 54 55 #include "qatomiccomparator_p.h" 56 #include "qpaircontainer_p.h" 57 #include "qcomparisonplatform_p.h" 58 59 QT_BEGIN_HEADER 60 61 QT_BEGIN_NAMESPACE 62 63 namespace QPatternist 64 { 65 66 /** 67 * @short Implements XPath 2.0's general comparions, such as the <tt>=</tt> operator. 68 * 69 * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform 70 * must access members of GeneralComparison. 71 * 72 * @see <a href="http://www.w3.org/TR/xpath20/#id-general-comparisons">XML Path Language 73 * (XPath) 2.0, 3.5.2 General Comparisons</a> 74 * @author Frans Englich <frans.englich@nokia.com> 75 * @ingroup Patternist_expressions 76 */ 77 class GeneralComparison : public PairContainer, 78 public ComparisonPlatform<GeneralComparison, 79 true /* We want to report errors. */, 80 AtomicComparator::AsGeneralComparison> 81 { 82 public: 83 GeneralComparison(const Expression::Ptr &op1, 84 const AtomicComparator::Operator op, 85 const Expression::Ptr &op2, 86 const bool isBackwardsCompat = false); 87 88 virtual bool evaluateEBV(const DynamicContext::Ptr &) const; 89 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, 90 const SequenceType::Ptr &reqType); 91 92 virtual SequenceType::List expectedOperandTypes() const; 93 virtual SequenceType::Ptr staticType() const; 94 95 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; 96 97 /** 98 * @returns always IDGeneralComparison 99 */ 100 virtual ID id() const; 101 102 virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const; 103 104 /** 105 * @returns the operator that this GeneralComparison is using. 106 */ operatorID()107 inline AtomicComparator::Operator operatorID() const 108 { 109 return m_operator; 110 } 111 112 /** 113 * Overridden to optimize case-insensitive compares. 114 */ 115 virtual Expression::Ptr compress(const StaticContext::Ptr &context); 116 117 private: 118 static inline void updateType(ItemType::Ptr &type, 119 const Expression::Ptr &source); 120 AtomicComparator::Ptr fetchGeneralComparator(Expression::Ptr &op1, 121 Expression::Ptr &op2, 122 const ReportContext::Ptr &context) const; 123 bool generalCompare(const Item &op1, 124 const Item &op2, 125 const DynamicContext::Ptr &context) const; 126 127 const AtomicComparator::Operator m_operator; 128 const bool m_isBackwardsCompat; 129 }; 130 } 131 132 QT_END_NAMESPACE 133 134 QT_END_HEADER 135 136 #endif 137