src/xmlpatterns/data/qdecimal_p.h

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  41
  42 //
  43 //  W A R N I N G
  44 //  -------------
  45 //
  46 // This file is not part of the Qt API.  It exists purely as an
  47 // implementation detail.  This header file may change from version to
  48 // version without notice, or even be removed.
  49 //
  50 // We mean it.
  51
  52 #ifndef Patternist_Decimal_H
  53 #define Patternist_Decimal_H
  54
  55 #include "qschemanumeric_p.h"
  56
  57 QT_BEGIN_HEADER
  58
  59 QT_BEGIN_NAMESPACE
  60
  61 /**
  62  * Defined in QtCore's qlocale.cpp.
  63  */
  64 extern char *qdtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve, char **resultp);
  65
  66 namespace QPatternist
  67 {
  68
  69     /**
  70      * @short Implements the value instance of the @c xs:decimal type.
  71      *
  72      * @author Frans Englich <frans.englich@nokia.com>
  73      * @ingroup Patternist_xdm
  74      * @todo Documentation is missing/incomplete
  75      */
  76     class Decimal : public Numeric
  77     {
  78     public:
  79
  80         static Decimal::Ptr fromValue(const xsDecimal num);
  81
  82         /**
  83          * Creates a Decimal from the lexical representation of @c xs:decimal stored in
  84          * @p strNumeric.
  85          *
  86          * A possible optimization is to create an Integer if the string ends
  87          * with ".0". But this is not conformant. For example, the user writes N.0
  88          * which according to the specification is an xs:decimal, but where the
  89          * expression is, is an xs:integer is required. That would pass with
  90          * such an optimization.
  91          */
  92         static AtomicValue::Ptr fromLexical(const QString &strNumeric);
  93
  94         /**
  95          * Gets the Effective %Boolean Value of this number.
  96          *
  97          * @returns @c false if the number is 0 or @c NaN, otherwise @c true.
  98          */
  99         bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const;
 100
 101         virtual QString stringValue() const;
 102
 103         /**
 104          * @returns always BuiltinTypes::xsDecimal
 105          */
 106         virtual ItemType::Ptr type() const;
 107
 108         virtual xsDouble toDouble() const;
 109         virtual xsInteger toInteger() const;
 110         virtual xsFloat toFloat() const;
 111         virtual xsDecimal toDecimal() const;
 112         virtual qulonglong toUnsignedInteger() const;
 113
 114         virtual Numeric::Ptr round() const;
 115         virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const;
 116         virtual Numeric::Ptr floor() const;
 117         virtual Numeric::Ptr ceiling() const;
 118         virtual Numeric::Ptr abs() const;
 119
 120         /**
 121          * @returns always @c false, xs:decimal doesn't have
 122          * not-a-number in its value space.
 123          */
 124         virtual bool isNaN() const;
 125
 126         /**
 127          * @returns always @c false, xs:decimal doesn't have
 128          * infinity in its value space.
 129          */
 130         virtual bool isInf() const;
 131
 132         virtual Item toNegated() const;
 133
 134         /**
 135          * Converts @p value into a canonical string representation for @c xs:decimal. This
 136          * function is used internally by various classes. Users probably wants to call
 137          * stringValue() which in turn calls this function.
 138          */
 139         static QString toString(const xsDecimal value);
 140
 141         virtual bool isSigned() const;
 142
 143     protected:
 144
 145         Decimal(const xsDecimal num);
 146
 147     private:
 148         const xsDecimal m_value;
 149     };
 150 }
 151
 152 QT_END_NAMESPACE
 153
 154 QT_END_HEADER
 155
 156 #endif