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** rights. These rights are described in the Nokia Qt LGPL Exception | |
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** GNU General Public License Usage | |
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** file. Please review the following information to ensure the GNU General | |
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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 "qsinglecontainer_p.h" | |
QT_BEGIN_HEADER | |
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 | |
QT_END_HEADER | |
#endif |