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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 // |
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43 // W A R N I N G |
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44 // ------------- |
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45 // |
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46 // This file is not part of the Qt API. It exists purely as an |
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47 // implementation detail. This header file may change from version to |
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48 // version without notice, or even be removed. |
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49 // |
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50 // We mean it. |
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51 |
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52 #ifndef Patternist_AbstractFloat_H |
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53 #define Patternist_AbstractFloat_H |
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54 |
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55 #include <math.h> |
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56 |
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57 #include <qnumeric.h> |
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58 |
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59 #include "qcommonvalues_p.h" |
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60 #include "qdecimal_p.h" |
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61 #include "qschemanumeric_p.h" |
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62 #include "qvalidationerror_p.h" |
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63 #include "qbuiltintypes_p.h" |
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64 |
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65 QT_BEGIN_HEADER |
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66 |
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67 QT_BEGIN_NAMESPACE |
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68 |
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69 namespace QPatternist |
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70 { |
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71 /** |
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72 * @short Base template class for Float and Double classes. |
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73 * |
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74 * @author Vincent Ricard <magic@magicninja.org> |
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75 * @ingroup Patternist_xdm |
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76 */ |
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77 template <const bool isDouble> |
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78 class AbstractFloat : public Numeric |
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79 { |
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80 public: |
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81 static Numeric::Ptr fromValue(const xsDouble num); |
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82 static AtomicValue::Ptr fromLexical(const QString &strNumeric); |
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83 |
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84 /** |
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85 * @todo more extensive docs. |
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86 * |
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87 * Performs floating point comparison. |
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88 * |
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89 * @returns @c true if @p a and @p are equal, otherwise @c false. |
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90 */ |
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91 static bool isEqual(const xsDouble a, const xsDouble b); |
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92 |
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93 /** |
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94 * Determines the Effective %Boolean Value of this number. |
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95 * |
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96 * @returns @c false if the number is 0 or @c NaN, otherwise @c true. |
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97 */ |
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98 bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const; |
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99 |
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100 /** |
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101 * Returns this AbstractFloat represented as an @c xs:string. |
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102 * |
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103 * @note In the XPath/XQuery languages, converting @c xs:double and @c xs:float |
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104 * to @c xs:string is not specified in XML Schema 1.0 Part 2: Datatypes Second Edition, |
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105 * but in XQuery 1.0 and XPath 2.0 Functions and Operators. This will change with W3C XML |
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106 * Schema 1.1 |
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107 * |
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108 * @see <a href="http://www.w3.org/TR/xpath-functions/#casting-to-string">XQuery 1.0 |
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109 * and XPath 2.0 Functions and Operators, 17.1.2 Casting to xs:string and xdt:untypedAtomic</a> |
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110 */ |
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111 virtual QString stringValue() const; |
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112 |
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113 virtual xsDouble toDouble() const; |
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114 virtual xsInteger toInteger() const; |
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115 virtual xsFloat toFloat() const; |
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116 virtual xsDecimal toDecimal() const; |
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117 |
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118 virtual Numeric::Ptr round() const; |
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119 virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const; |
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120 virtual Numeric::Ptr floor() const; |
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121 virtual Numeric::Ptr ceiling() const; |
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122 virtual Numeric::Ptr abs() const; |
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123 |
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124 virtual bool isNaN() const; |
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125 virtual bool isInf() const; |
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126 |
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127 virtual ItemType::Ptr type() const; |
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128 virtual Item toNegated() const; |
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129 virtual qulonglong toUnsignedInteger() const; |
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130 |
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131 virtual bool isSigned() const; |
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132 protected: |
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133 AbstractFloat(const xsDouble num); |
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134 |
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135 private: |
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136 /** |
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137 * From the Open Group's man page: "The signbit() macro shall return a |
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138 * non-zero value if and only if the sign of its argument value is |
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139 * negative." |
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140 * |
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141 * MS Windows doesn't have std::signbit() so here's |
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142 * a reinvention of that function. |
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143 */ |
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144 static inline int internalSignbit(const xsDouble v); |
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145 inline bool isZero() const; |
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146 |
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147 const xsDouble m_value; |
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148 }; |
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149 |
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150 template <const bool isDouble> |
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151 Numeric::Ptr createFloat(const xsDouble num); |
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152 |
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153 #include "qabstractfloat.cpp" |
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154 |
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155 /** |
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156 * @short An instantiation of AbsbstractFloat suitable for @c xs:double. |
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157 * |
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158 * @ingroup Patternist_xdm |
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159 */ |
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160 typedef AbstractFloat<true> Double; |
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161 |
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162 /** |
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163 * @short An instantiation of AbstractFloat suitable for @c xs:float. |
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164 * |
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165 * @ingroup Patternist_xdm |
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166 */ |
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167 typedef AbstractFloat<false> Float; |
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168 } |
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169 |
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170 QT_END_NAMESPACE |
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171 |
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172 QT_END_HEADER |
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173 |
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174 #endif |