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Diffstat (limited to 'src/xmlpatterns/data/qabstractfloat_p.h')
| -rw-r--r-- | src/xmlpatterns/data/qabstractfloat_p.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/xmlpatterns/data/qabstractfloat_p.h b/src/xmlpatterns/data/qabstractfloat_p.h new file mode 100644 index 0000000..61ec9c1 --- /dev/null +++ b/src/xmlpatterns/data/qabstractfloat_p.h @@ -0,0 +1,174 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtXmlPatterns module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, 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 Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// 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 |