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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_ReturnOrderBy_H
53 #define Patternist_ReturnOrderBy_H
55 #include <private/qorderby_p.h>
56 #include <private/qunlimitedcontainer_p.h>
65 * @short Together with OrderBy, it implements XQuery 1.0's <tt>order by</tt> expression.
67 * ReturnOrderBy evaluates the sort keys and values, and hands it over to
68 * OrderBy, which is an AST ancestor, using SortTuples.
70 * @author Frans Englich <frans.englich@nokia.com>
71 * @ingroup Patternist_expressions
73 class ReturnOrderBy : public UnlimitedContainer
77 * In @p operands the first item is the return expression, and the
78 * rest, which is at least one, are the sort keys.
80 ReturnOrderBy(const OrderBy::Stability stability,
81 const OrderBy::OrderSpec::Vector &oSpecs,
82 const Expression::List &operands);
84 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
85 virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
86 virtual SequenceType::Ptr staticType() const;
87 virtual SequenceType::List expectedOperandTypes() const;
88 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
89 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
90 virtual ID id() const;
92 inline OrderBy::OrderSpec::Vector orderSpecs() const
97 inline OrderBy::Stability stability() const
103 * In the case of that we don't have a for-expression beloning us, but
104 * only a let clause, this ReturnOrderBy breaks if it stays in the AST.
105 * So, by default we assume that we should write ourselves away, unless
106 * this function is called. The associated ForClause will call it
107 * during typeCheck(), if it exists.
109 inline void setStay(const bool a)
114 virtual Properties properties() const;
117 * This variable is unfortunately only used at compile time. However,
118 * it's tricky to get rid of it due to how QueryTransformParser would
119 * have to be adapted.
121 const OrderBy::Stability m_stability;
123 OrderBy::OrderSpec::Vector m_orderSpecs;