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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_Atomizer_H |
51 | #define Patternist_Atomizer_H |
52 | |
53 | #include <private/qitem_p.h> |
54 | #include <private/qsinglecontainer_p.h> |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | |
58 | namespace QPatternist |
59 | { |
60 | |
61 | /** |
62 | * @short Performs atomization. Effectively, it is an implementation |
63 | * of the <tt>fn:data()</tt> function. |
64 | * |
65 | * @see <a href="http://www.w3.org/TR/xpath-functions/#func-data">XQuery 1.0 and XPath |
66 | * 2.0 Functions and Operators, 2.4 fn:data</a> |
67 | * @see <a href="http://www.w3.org/TR/xpath20/#id-atomization">XML |
68 | * Path Language (XPath) 2.0, 2.4.2 Atomization</a> |
69 | * @author Frans Englich <frans.englich@nokia.com> |
70 | * @ingroup Patternist_expressions |
71 | */ |
72 | class Atomizer : public SingleContainer |
73 | { |
74 | public: |
75 | Atomizer(const Expression::Ptr &operand); |
76 | |
77 | virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
78 | virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
79 | |
80 | virtual SequenceType::Ptr staticType() const; |
81 | |
82 | virtual SequenceType::List expectedOperandTypes() const; |
83 | virtual const SourceLocationReflection *actualReflection() const; |
84 | |
85 | /** |
86 | * Makes an early compression, by returning the result of |
87 | * the type checked operand, if the operand has the static type |
88 | * xs:anyAtomicType(no atomization needed). |
89 | */ |
90 | virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
91 | const SequenceType::Ptr &reqType); |
92 | |
93 | inline Item::Iterator::Ptr mapToSequence(const Item &item, |
94 | const DynamicContext::Ptr &context) const; |
95 | virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
96 | |
97 | private: |
98 | typedef QExplicitlySharedDataPointer<const Atomizer> ConstPtr; |
99 | }; |
100 | } |
101 | |
102 | QT_END_NAMESPACE |
103 | |
104 | #endif |
105 | |