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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_AbstractFloat_H
51#define Patternist_AbstractFloat_H
52
53#include <math.h>
54
55#include <qnumeric.h>
56
57#include <private/qcommonvalues_p.h>
58#include <private/qdecimal_p.h>
59#include <private/qschemanumeric_p.h>
60#include <private/qvalidationerror_p.h>
61#include <private/qbuiltintypes_p.h>
62#include <private/qlocale_tools_p.h>
63
64QT_BEGIN_NAMESPACE
65
66namespace QPatternist
67{
68 /**
69 * @short Base template class for Float and Double classes.
70 *
71 * @author Vincent Ricard <magic@magicninja.org>
72 * @ingroup Patternist_xdm
73 */
74 template <const bool isDouble>
75 class AbstractFloat : public Numeric
76 {
77 public:
78 static Numeric::Ptr fromValue(const xsDouble num);
79 static AtomicValue::Ptr fromLexical(const QString &strNumeric);
80
81 /**
82 * @todo more extensive docs.
83 *
84 * Performs floating point comparison.
85 *
86 * @returns @c true if @p a and @p are equal, otherwise @c false.
87 */
88 static bool isEqual(const xsDouble a, const xsDouble b);
89
90 /**
91 * Determines the Effective %Boolean Value of this number.
92 *
93 * @returns @c false if the number is 0 or @c NaN, otherwise @c true.
94 */
95 bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const;
96
97 /**
98 * Returns this AbstractFloat represented as an @c xs:string.
99 *
100 * @note In the XPath/XQuery languages, converting @c xs:double and @c xs:float
101 * to @c xs:string is not specified in XML Schema 1.0 Part 2: Datatypes Second Edition,
102 * but in XQuery 1.0 and XPath 2.0 Functions and Operators. This will change with W3C XML
103 * Schema 1.1
104 *
105 * @see <a href="http://www.w3.org/TR/xpath-functions/#casting-to-string">XQuery 1.0
106 * and XPath 2.0 Functions and Operators, 17.1.2 Casting to xs:string and xdt:untypedAtomic</a>
107 */
108 virtual QString stringValue() const;
109
110 virtual xsDouble toDouble() const;
111 virtual xsInteger toInteger() const;
112 virtual xsFloat toFloat() const;
113 virtual xsDecimal toDecimal() const;
114
115 virtual Numeric::Ptr round() const;
116 virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const;
117 virtual Numeric::Ptr floor() const;
118 virtual Numeric::Ptr ceiling() const;
119 virtual Numeric::Ptr abs() const;
120
121 virtual bool isNaN() const;
122 virtual bool isInf() const;
123
124 virtual ItemType::Ptr type() const;
125 virtual Item toNegated() const;
126 virtual qulonglong toUnsignedInteger() const;
127
128 virtual bool isSigned() const;
129 protected:
130 AbstractFloat(const xsDouble num);
131
132 private:
133 /**
134 * From the Open Group's man page: "The signbit() macro shall return a
135 * non-zero value if and only if the sign of its argument value is
136 * negative."
137 *
138 * MS Windows doesn't have std::signbit() so here's
139 * a reinvention of that function.
140 */
141 static inline int internalSignbit(const xsDouble v);
142 inline bool isZero() const;
143
144 const xsDouble m_value;
145 };
146
147 template <const bool isDouble>
148 Numeric::Ptr createFloat(const xsDouble num);
149
150#include "qabstractfloat_tpl_p.h"
151
152 /**
153 * @short An instantiation of AbsbstractFloat suitable for @c xs:double.
154 *
155 * @ingroup Patternist_xdm
156 */
157 typedef AbstractFloat<true> Double;
158
159 /**
160 * @short An instantiation of AbstractFloat suitable for @c xs:float.
161 *
162 * @ingroup Patternist_xdm
163 */
164 typedef AbstractFloat<false> Float;
165}
166
167QT_END_NAMESPACE
168
169#endif
170

source code of qtxmlpatterns/src/xmlpatterns/data/qabstractfloat_p.h