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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_TreatAs_H |
| #define Patternist_TreatAs_H |
| |
| #include <private/qsinglecontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Implements XPath 2.0's <tt>treat as</tt> expression. |
| * |
| * TreatAs is always a compile-time class only, and is always deallocated |
| * by re-writing to CardinalityVerifier or ItemVerifier or both, by calling |
| * TypeChecker::applyFunctionConversion(). |
| * |
| * |
| * One approach could be to skip instantiating TreatAs and simply let the |
| * return value of TypeChecker::applyFunctionConversion() be inserted into |
| * the AST, but that wouldn't handle type checking the context item |
| * properly, which depends on that the StaticContext have been set by the |
| * parent Expression. |
| * |
| * @see <a href="http://www.w3.org/TR/xpath20/#id-treat">XML Path Language |
| * (XPath) 2.0, 3.10.5 Treat</a> |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @ingroup Patternist_expressions |
| */ |
| class TreatAs : public SingleContainer |
| { |
| public: |
| /** |
| * Creats a TreatAs where it is checked that the expression @p operand conforms |
| * to the type @p reqType. |
| */ |
| TreatAs(const Expression::Ptr &operand, |
| const SequenceType::Ptr &reqType); |
| |
| /** |
| * This function rewrites always. First the type that this TreatAs expression tests for |
| * is verified. Then, the type the <tt>treat as</tt> expression itself must match, @p reqType, |
| * is verified. |
| */ |
| virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType); |
| |
| /** |
| * @returns always the SequenceType passed in the constructor to this class. That is, the |
| * SequenceType that the operand must conform to. |
| */ |
| virtual SequenceType::Ptr staticType() const; |
| |
| /** |
| * @returns a list containing one CommonSequenceTypes::ZeroOrMoreItems |
| */ |
| virtual SequenceType::List expectedOperandTypes() const; |
| |
| virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
| |
| private: |
| const SequenceType::Ptr m_reqType; |
| }; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |