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39
40//
41// W A R N I N G
42// -------------
43//
44// This file is not part of the Qt API. It exists purely as an
45// implementation detail. This header file may change from version to
46// version without notice, or even be removed.
47//
48// We mean it.
49
50#ifndef Patternist_EBVExtractor_H
51#define Patternist_EBVExtractor_H
52
53#include <private/qsinglecontainer_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59 /**
60 * @short Calculates the Effective Boolean Value of its operand.
61 *
62 * EBVExtractor performs functionality wise the same as @c fn:boolean(),
63 * but does it without the dependencies which FunctionCall requires.
64 *
65 * There is code-duplication going on with BooleanFN.
66 *
67 * @see BooleanFN
68 * @author Frans Englich <frans.englich@nokia.com>
69 * @ingroup Patternist_expressions
70 */
71 class EBVExtractor : public SingleContainer
72 {
73 public:
74 EBVExtractor(const Expression::Ptr &operand);
75 virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
76 virtual SequenceType::List expectedOperandTypes() const;
77 virtual const SourceLocationReflection *actualReflection() const;
78 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
79 const SequenceType::Ptr &reqType);
80 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
81
82 /**
83 * @short Returns always @c xs:boolean.
84 */
85 virtual SequenceType::Ptr staticType() const;
86
87 template<typename TSubClass, typename ThisType>
88 static Expression::Ptr typeCheck(const StaticContext::Ptr &context,
89 const SequenceType::Ptr &reqType,
90 ThisType *const caller)
91 {
92 if(*CommonSequenceTypes::EBV->itemType() == *reqType->itemType())
93 return caller->operands().first()->typeCheck(context, reqType);
94 else
95 return caller->TSubClass::typeCheck(context, reqType);
96 }
97
98 };
99}
100
101QT_END_NAMESPACE
102
103#endif
104

source code of qtxmlpatterns/src/xmlpatterns/janitors/qebvextractor_p.h