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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.
52 #ifndef Patternist_GeneralComparison_H
53 #define Patternist_GeneralComparison_H
55 #include "qatomiccomparator_p.h"
56 #include "qpaircontainer_p.h"
57 #include "qcomparisonplatform_p.h"
67 * @short Implements XPath 2.0's general comparions, such as the <tt>=</tt> operator.
69 * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform
70 * must access members of GeneralComparison.
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
77 class GeneralComparison : public PairContainer,
78 public ComparisonPlatform<GeneralComparison,
79 true /* We want to report errors. */,
80 AtomicComparator::AsGeneralComparison>
83 GeneralComparison(const Expression::Ptr &op1,
84 const AtomicComparator::Operator op,
85 const Expression::Ptr &op2,
86 const bool isBackwardsCompat = false);
88 virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
89 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
90 const SequenceType::Ptr &reqType);
92 virtual SequenceType::List expectedOperandTypes() const;
93 virtual SequenceType::Ptr staticType() const;
95 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
98 * @returns always IDGeneralComparison
100 virtual ID id() const;
102 virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
105 * @returns the operator that this GeneralComparison is using.
107 inline AtomicComparator::Operator operatorID() const
113 * Overridden to optimize case-insensitive compares.
115 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
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,
125 const DynamicContext::Ptr &context) const;
127 const AtomicComparator::Operator m_operator;
128 const bool m_isBackwardsCompat;