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6 | ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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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 | |
64 | QT_BEGIN_NAMESPACE |
65 | |
66 | namespace 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 | |
167 | QT_END_NAMESPACE |
168 | |
169 | #endif |
170 | |