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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_ValueComparison_H |
51 | #define Patternist_ValueComparison_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 value comparions, such as the <tt>eq</tt> operator. |
64 | * |
65 | * ComparisonPlatform is inherited with @c protected scope because ComparisonPlatform |
66 | * must access members of ValueComparison. |
67 | * |
68 | * @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">XML Path Language |
69 | * (XPath) 2.0, 3.5.1 Value Comparisons</a> |
70 | * @author Frans Englich <frans.englich@nokia.com> |
71 | * @ingroup Patternist_expressions |
72 | */ |
73 | class Q_AUTOTEST_EXPORT ValueComparison |
74 | : public PairContainer, public ComparisonPlatform<ValueComparison, true> |
75 | { |
76 | public: |
77 | ValueComparison(const Expression::Ptr &op1, |
78 | const AtomicComparator::Operator op, |
79 | const Expression::Ptr &op2); |
80 | ~ValueComparison(); |
81 | |
82 | virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
83 | |
84 | virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
85 | const SequenceType::Ptr &reqType); |
86 | |
87 | /** |
88 | * @returns always CommonSequenceTypes::ExactlyOneBoolean |
89 | */ |
90 | virtual SequenceType::Ptr staticType() const; |
91 | |
92 | virtual SequenceType::List expectedOperandTypes() const; |
93 | |
94 | /** |
95 | * @returns IDValueComparison |
96 | */ |
97 | virtual ID id() const; |
98 | |
99 | virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
100 | virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const; |
101 | |
102 | /** |
103 | * Overridden to optimize case-insensitive compares. |
104 | */ |
105 | virtual Expression::Ptr compress(const StaticContext::Ptr &context); |
106 | |
107 | /** |
108 | * @returns the operator that this ValueComparison is using. |
109 | */ |
110 | inline AtomicComparator::Operator operatorID() const |
111 | { |
112 | return m_operator; |
113 | } |
114 | |
115 | /** |
116 | * It is considered that the string value from @p op1 will be compared against @p op2. This |
117 | * function determines whether the user intends the comparison to be case insensitive. If |
118 | * that is the case @c true is returned, and the operands are re-written appropriately. |
119 | * |
120 | * This is a helper function for Expression classes that compares strings. |
121 | * |
122 | * @see ComparisonPlatform::useCaseInsensitiveComparator() |
123 | */ |
124 | static bool isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2); |
125 | |
126 | private: |
127 | const AtomicComparator::Operator m_operator; |
128 | }; |
129 | } |
130 | |
131 | QT_END_NAMESPACE |
132 | |
133 | #endif |
134 | |