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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** This file is part of the QtXmlPatterns module of the Qt Toolkit. | |
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** GNU Lesser General Public License Usage | |
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** file. Please review the following information to ensure the GNU Lesser | |
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** rights. These rights are described in the Nokia Qt LGPL Exception | |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | |
** | |
** GNU General Public License Usage | |
** Alternatively, this file may be used under the terms of the GNU General | |
** Public License version 3.0 as published by the Free Software Foundation | |
** and appearing in the file LICENSE.GPL included in the packaging of this | |
** 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_AbstractFloat_H | |
#define Patternist_AbstractFloat_H | |
#include <math.h> | |
#include <qnumeric.h> | |
#include "qcommonvalues_p.h" | |
#include "qdecimal_p.h" | |
#include "qschemanumeric_p.h" | |
#include "qvalidationerror_p.h" | |
#include "qbuiltintypes_p.h" | |
QT_BEGIN_HEADER | |
QT_BEGIN_NAMESPACE | |
namespace QPatternist | |
{ | |
/** | |
* @short Base template class for Float and Double classes. | |
* | |
* @author Vincent Ricard <magic@magicninja.org> | |
* @ingroup Patternist_xdm | |
*/ | |
template <const bool isDouble> | |
class AbstractFloat : public Numeric | |
{ | |
public: | |
static Numeric::Ptr fromValue(const xsDouble num); | |
static AtomicValue::Ptr fromLexical(const QString &strNumeric); | |
/** | |
* @todo more extensive docs. | |
* | |
* Performs floating point comparison. | |
* | |
* @returns @c true if @p a and @p are equal, otherwise @c false. | |
*/ | |
static bool isEqual(const xsDouble a, const xsDouble b); | |
/** | |
* Determines the Effective %Boolean Value of this number. | |
* | |
* @returns @c false if the number is 0 or @c NaN, otherwise @c true. | |
*/ | |
bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const; | |
/** | |
* Returns this AbstractFloat represented as an @c xs:string. | |
* | |
* @note In the XPath/XQuery languages, converting @c xs:double and @c xs:float | |
* to @c xs:string is not specified in XML Schema 1.0 Part 2: Datatypes Second Edition, | |
* but in XQuery 1.0 and XPath 2.0 Functions and Operators. This will change with W3C XML | |
* Schema 1.1 | |
* | |
* @see <a href="http://www.w3.org/TR/xpath-functions/#casting-to-string">XQuery 1.0 | |
* and XPath 2.0 Functions and Operators, 17.1.2 Casting to xs:string and xdt:untypedAtomic</a> | |
*/ | |
virtual QString stringValue() const; | |
virtual xsDouble toDouble() const; | |
virtual xsInteger toInteger() const; | |
virtual xsFloat toFloat() const; | |
virtual xsDecimal toDecimal() const; | |
virtual Numeric::Ptr round() const; | |
virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const; | |
virtual Numeric::Ptr floor() const; | |
virtual Numeric::Ptr ceiling() const; | |
virtual Numeric::Ptr abs() const; | |
virtual bool isNaN() const; | |
virtual bool isInf() const; | |
virtual ItemType::Ptr type() const; | |
virtual Item toNegated() const; | |
virtual qulonglong toUnsignedInteger() const; | |
virtual bool isSigned() const; | |
protected: | |
AbstractFloat(const xsDouble num); | |
private: | |
/** | |
* From the Open Group's man page: "The signbit() macro shall return a | |
* non-zero value if and only if the sign of its argument value is | |
* negative." | |
* | |
* MS Windows doesn't have std::signbit() so here's | |
* a reinvention of that function. | |
*/ | |
static inline int internalSignbit(const xsDouble v); | |
inline bool isZero() const; | |
const xsDouble m_value; | |
}; | |
template <const bool isDouble> | |
Numeric::Ptr createFloat(const xsDouble num); | |
#include "qabstractfloat.cpp" | |
/** | |
* @short An instantiation of AbsbstractFloat suitable for @c xs:double. | |
* | |
* @ingroup Patternist_xdm | |
*/ | |
typedef AbstractFloat<true> Double; | |
/** | |
* @short An instantiation of AbstractFloat suitable for @c xs:float. | |
* | |
* @ingroup Patternist_xdm | |
*/ | |
typedef AbstractFloat<false> Float; | |
} | |
QT_END_NAMESPACE | |
QT_END_HEADER | |
#endif |