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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_CastableAs_H
51#define Patternist_CastableAs_H
52
53#include <private/qsinglecontainer_p.h>
54#include <private/qcastingplatform_p.h>
55
56QT_BEGIN_NAMESPACE
57
58namespace QPatternist
59{
60
61 /**
62 * @short Implements XPath 2.0's <tt>castable as</tt> expression.
63 *
64 * @see <a href="http://www.w3.org/TR/xpath20/#id-castable">XML Path Language
65 * (XPath) 2.0, 3.10.3 Castable</a>
66 * @author Frans Englich <frans.englich@nokia.com>
67 * @ingroup Patternist_expressions
68 */
69 class CastableAs : public SingleContainer,
70 public CastingPlatform<CastableAs, false>
71 {
72 public:
73 CastableAs(const Expression::Ptr &operand,
74 const SequenceType::Ptr &targetType);
75
76 virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
77
78 /**
79 * Overridden to const fold to @c true when the target type
80 * is a type which casting to always succeeds. This is
81 * the type identical to the target type, <tt>xs:string</tt>,
82 * and <tt>xs:untypedAtomic</tt>.
83 */
84 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
85 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
86 const SequenceType::Ptr &reqType);
87
88 virtual SequenceType::List expectedOperandTypes() const;
89 virtual SequenceType::Ptr staticType() const;
90
91 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
92
93 inline ItemType::Ptr targetType() const
94 {
95 return m_targetType->itemType();
96 }
97
98 private:
99 const SequenceType::Ptr m_targetType;
100 };
101}
102
103QT_END_NAMESPACE
104
105#endif
106

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