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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 | |
57 | QT_BEGIN_NAMESPACE |
58 | |
59 | namespace 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 | |
129 | QT_END_NAMESPACE |
130 | |
131 | #endif |
132 | |