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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_ArgumentConverter_H
51#define Patternist_ArgumentConverter_H
52
53#include <private/quntypedatomicconverter_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59
60 /**
61 * @short UntypedAtomicConverter for ArgumentReference, if needed.
62 *
63 * If an argument inside a user function has no type declared, its type
64 * is @c item(). It's atomized type would be inferred to @c
65 * xs:anyAtomicType, but that is not necessarily correct, since the actual
66 * value can be anything, nodes or atomic values.
67 *
68 * This extremely dynamic case is handled by ArgumentConverter which is inserted for
69 * ArgumentReference that has the static type @c item(), when atomic value are asked
70 * for. At runtime it atomizes/let values through appropriately.
71 *
72 * @author Frans Englich <frans.englich@nokia.com>
73 * @ingroup Patternist_expressions
74 */
75 class ArgumentConverter : public UntypedAtomicConverter
76 {
77 public:
78 ArgumentConverter(const Expression::Ptr &operand,
79 const ItemType::Ptr &reqType);
80
81 virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
82 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
83 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
84 inline Item::Iterator::Ptr mapToSequence(const Item &item,
85 const DynamicContext::Ptr &context) const;
86 virtual SequenceType::List expectedOperandTypes() const;
87 virtual SequenceType::Ptr staticType() const;
88
89 private:
90 typedef QExplicitlySharedDataPointer<const ArgumentConverter> ConstPtr;
91
92 };
93}
94
95QT_END_NAMESPACE
96
97#endif
98

source code of qtxmlpatterns/src/xmlpatterns/janitors/qargumentconverter_p.h