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39
40//
41// W A R N I N G
42// -------------
43//
44// This file is not part of the Qt API. It exists purely as an
45// implementation detail. This header file may change from version to
46// version without notice, or even be removed.
47//
48// We mean it.
49
50#ifndef Patternist_GeneralComparison_H
51#define Patternist_GeneralComparison_H
52
53#include <private/qatomiccomparator_p.h>
54#include <private/qpaircontainer_p.h>
55#include <private/qcomparisonplatform_p.h>
56
57QT_BEGIN_NAMESPACE
58
59namespace QPatternist
60{
61
62 /**
63 * @short Implements XPath 2.0's general comparions, such as the <tt>=</tt> operator.
64 *
65 * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform
66 * must access members of GeneralComparison.
67 *
68 * @see <a href="http://www.w3.org/TR/xpath20/#id-general-comparisons">XML Path Language
69 * (XPath) 2.0, 3.5.2 General Comparisons</a>
70 * @author Frans Englich <frans.englich@nokia.com>
71 * @ingroup Patternist_expressions
72 */
73 class Q_AUTOTEST_EXPORT GeneralComparison
74 : public PairContainer, public ComparisonPlatform<GeneralComparison,
75 true /* We want to report errors. */,
76 AtomicComparator::AsGeneralComparison>
77 {
78 public:
79 GeneralComparison(const Expression::Ptr &op1,
80 const AtomicComparator::Operator op,
81 const Expression::Ptr &op2,
82 const bool isBackwardsCompat = false);
83 ~GeneralComparison();
84
85 virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
86 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
87 const SequenceType::Ptr &reqType);
88
89 virtual SequenceType::List expectedOperandTypes() const;
90 virtual SequenceType::Ptr staticType() const;
91
92 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
93
94 /**
95 * @returns always IDGeneralComparison
96 */
97 virtual ID id() const;
98
99 virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
100
101 /**
102 * @returns the operator that this GeneralComparison is using.
103 */
104 inline AtomicComparator::Operator operatorID() const
105 {
106 return m_operator;
107 }
108
109 /**
110 * Overridden to optimize case-insensitive compares.
111 */
112 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
113
114 private:
115 static inline void updateType(ItemType::Ptr &type,
116 const Expression::Ptr &source);
117 AtomicComparator::Ptr fetchGeneralComparator(Expression::Ptr &op1,
118 Expression::Ptr &op2,
119 const ReportContext::Ptr &context) const;
120 bool generalCompare(const Item &op1,
121 const Item &op2,
122 const DynamicContext::Ptr &context) const;
123
124 const AtomicComparator::Operator m_operator;
125 const bool m_isBackwardsCompat;
126 };
127}
128
129QT_END_NAMESPACE
130
131#endif
132

source code of qtxmlpatterns/src/xmlpatterns/expr/qgeneralcomparison_p.h