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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_CastableAs_H
53 #define Patternist_CastableAs_H
55 #include <private/qsinglecontainer_p.h>
56 #include <private/qcastingplatform_p.h>
66 * @short Implements XPath 2.0's <tt>castable as</tt> expression.
68 * @see <a href="http://www.w3.org/TR/xpath20/#id-castable">XML Path Language
69 * (XPath) 2.0, 3.10.3 Castable</a>
70 * @author Frans Englich <frans.englich@nokia.com>
71 * @ingroup Patternist_expressions
73 class CastableAs : public SingleContainer,
74 public CastingPlatform<CastableAs, false>
77 CastableAs(const Expression::Ptr &operand,
78 const SequenceType::Ptr &targetType);
80 virtual bool evaluateEBV(const DynamicContext::Ptr &) const;
83 * Overridden to const fold to @c true when the target type
84 * is a type which casting to always succeeds. This is
85 * the type identical to the target type, <tt>xs:string</tt>,
86 * and <tt>xs:untypedAtomic</tt>.
88 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
89 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
90 const SequenceType::Ptr &reqType);
92 virtual SequenceType::List expectedOperandTypes() const;
93 virtual SequenceType::Ptr staticType() const;
95 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
97 inline ItemType::Ptr targetType() const
99 return m_targetType->itemType();
103 const SequenceType::Ptr m_targetType;