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| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| |
| #ifndef Patternist_OrderBy_H |
| #define Patternist_OrderBy_H |
| |
| #include <private/qatomiccomparator_p.h> |
| #include <private/qcomparisonplatform_p.h> |
| #include <private/qsinglecontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| class ReturnOrderBy; |
| |
| /** |
| * @short Performs the sorting by being a parent to ForClause. |
| * |
| * The child of the ForClause is a ReturnOrderBy expression, which collects |
| * the sort keys and values. |
| * |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class OrderBy : public SingleContainer |
| { |
| public: |
| enum Stability |
| { |
| StableOrder, |
| UnstableOrder |
| }; |
| |
| /** |
| * This class is value based. |
| */ |
| class OrderSpec : public ComparisonPlatform<OrderBy::OrderSpec, |
| true, /* Yes, issue errors. */ |
| AtomicComparator::AsValueComparison> |
| { |
| public: |
| /** |
| * We want this guy to be public. |
| */ |
| using ComparisonPlatform<OrderBy::OrderSpec, true, AtomicComparator::AsValueComparison>::detailedFlexibleCompare; |
| |
| typedef QVector<OrderSpec> Vector; |
| |
| enum Direction |
| { |
| Ascending, |
| Descending |
| }; |
| |
| /** |
| * @short Default constructor, which is needed by QVector. |
| */ |
| inline OrderSpec() |
| : direction(Ascending), |
| orderingEmptySequence(StaticContext::Greatest) |
| { |
| } |
| |
| inline OrderSpec(const Direction dir, |
| const StaticContext::OrderingEmptySequence orderingEmpty) : direction(dir), |
| orderingEmptySequence(orderingEmpty) |
| { |
| } |
| |
| void prepare(const Expression::Ptr &source, |
| const StaticContext::Ptr &context); |
| |
| const SourceLocationReflection *actualReflection() const |
| { |
| return m_expr.data(); |
| } |
| |
| private: |
| Expression::Ptr m_expr; |
| |
| public: |
| /** |
| * We place these afterwards, such that m_expr gets aligned at the |
| * start of the address. |
| */ |
| Direction direction; |
| |
| StaticContext::OrderingEmptySequence orderingEmptySequence; |
| |
| inline AtomicComparator::Operator operatorID() const |
| { |
| return orderingEmptySequence == StaticContext::Least ? AtomicComparator::OperatorLessThanNaNLeast |
| : AtomicComparator::OperatorLessThanNaNGreatest; |
| } |
| |
| }; |
| |
| OrderBy(const Stability stability, |
| const OrderSpec::Vector &orderSpecs, |
| const Expression::Ptr &operand, |
| ReturnOrderBy *const returnOrderBy); |
| |
| virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const; |
| virtual SequenceType::Ptr staticType() const; |
| virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType); |
| virtual Expression::Ptr compress(const StaticContext::Ptr &context); |
| virtual SequenceType::List expectedOperandTypes() const; |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| |
| inline Item::Iterator::Ptr mapToSequence(const Item &i, |
| const DynamicContext::Ptr &context) const; |
| virtual Properties properties() const; |
| |
| private: |
| /** |
| * Needed when calling makeSequenceMappingIterator(). |
| */ |
| typedef QExplicitlySharedDataPointer<const OrderBy> ConstPtr; |
| |
| const Stability m_stability; |
| OrderSpec::Vector m_orderSpecs; |
| ReturnOrderBy *const m_returnOrderBy; |
| }; |
| |
| /* TODO Q_DECLARE_TYPEINFO(OrderBy::OrderSpec, Q_MOVABLE_TYPE); Breaks, |
| * probably because it's nested. */ |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |