Numerics.hpp

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/* REXX Kernel                                                                */
/*                                                                            */
/* Utility class to manage the various sorts of numeric conversions required  */
/* by Rexx.  These conversions are all just static methods.                   */
/*                                                                            */
/******************************************************************************/
#ifndef Included_Numerics
#define Included_Numerics
 
 
class NumericSettings                  // "global" numeric settings         */
{
    public:
      NumericSettings();
      size_t digits;                       /* numeric digits setting            */
      size_t fuzz;                         /* numeric fuzz setting              */
      bool form;                           /* numeric form setting              */
};                                         /* global activation settings        */
 
 
class Numerics
{
public:
    static const wholenumber_t MAX_WHOLENUMBER;
    static const wholenumber_t MIN_WHOLENUMBER;
    static const wholenumber_t MAX_EXPONENT;
    static const wholenumber_t MIN_EXPONENT;
    static const size_t DEFAULT_DIGITS;
    // a digits setting for full range integer conversion
    static const size_t ARGUMENT_DIGITS;
    // the digits setting used internally for function/method arguments to allow
    // for the full range
    static const size_t SIZE_DIGITS;
    static const size_t  MAX_STRINGSIZE;
 
    // max numeric digits value for explicit 64-bit conversions
    static const size_t DIGITS64;
    static const bool FORM_SCIENTIFIC;
    static const bool FORM_ENGINEERING;
 
    static const size_t DEFAULT_FUZZ;
                                     /* default numeric form setting      */
    static const bool DEFAULT_FORM;
 
    static const wholenumber_t validMaxWhole[];      // table of maximum values per digits setting
 
    static RexxObject *wholenumberToObject(wholenumber_t v);
    static RexxObject *stringsizeToObject(stringsize_t v);
    static RexxObject *int64ToObject(int64_t v);
    static RexxObject *uint64ToObject(uint64_t v);
    static RexxObject *uintptrToObject(uintptr_t v);
    static RexxObject *intptrToObject(intptr_t v);
 
    static bool objectToWholeNumber(RexxObject *o, wholenumber_t &result, wholenumber_t max, wholenumber_t min);
    static bool objectToStringSize(RexxObject *o, stringsize_t &result, stringsize_t max);
    static bool objectToSignedInteger(RexxObject *o, ssize_t &result, ssize_t max, ssize_t min);
    static bool objectToUnsignedInteger(RexxObject *o, size_t &result, size_t max);
    static bool objectToInt64(RexxObject *o, int64_t &result);
    static bool objectToUnsignedInt64(RexxObject *o, uint64_t &result);
    static bool objectToUintptr(RexxObject *source, uintptr_t &result);
    static bool objectToIntptr(RexxObject *source, intptr_t &result);
    static RexxObject *int64Object(RexxObject *source);
 
    static size_t formatWholeNumber(wholenumber_t integer, char *dest);
    static size_t formatStringSize(stringsize_t integer, char *dest);
    static size_t formatInt64(int64_t integer, char *dest);
    static size_t formatUnsignedInt64(uint64_t integer, char *dest);
 
    static size_t normalizeWholeNumber(wholenumber_t integer, char *dest);
 
    static size_t digits() { return settings->digits; }
    static size_t fuzz()   { return settings->fuzz; }
    static bool   form()   { return settings->form; }
    static void   setCurrentSettings(NumericSettings *s) { settings = s; }
    static NumericSettings *setDefaultSettings() { settings = &defaultSettings; return settings; }
    static NumericSettings *getDefaultSettings() { return &defaultSettings; }
    static inline wholenumber_t abs(wholenumber_t n) { return n < 0 ? -n : n; }
    static inline wholenumber_t minVal(wholenumber_t n1, wholenumber_t n2) { return n2 > n1 ? n1 : n2; }
    static inline stringsize_t minVal(stringsize_t n1, stringsize_t n2) { return n2 > n1 ? n1 : n2; }
    static inline wholenumber_t maxVal(wholenumber_t n1, wholenumber_t n2) { return n2 > n1 ? n2 : n1; }
    static inline stringsize_t maxVal(stringsize_t n1, stringsize_t n2) { return n2 > n1 ? n2 : n1; }
    static inline wholenumber_t maxValueForDigits(size_t d)
    {
        if (d > ARGUMENT_DIGITS)
        {
            return validMaxWhole[ARGUMENT_DIGITS - 1];
        }
        else
        {
            return validMaxWhole[d - 1];
        }
    }
 
    static inline wholenumber_t multiplierForExponent(size_t e)
    {
        return validMaxWhole[e - 1];
    }
 
    static RexxString *pointerToString(void *);
 
 
protected:
 
    static NumericSettings *settings;
    static NumericSettings  defaultSettings;
};
 
 
inline size_t number_digits() { return Numerics::digits(); }
inline size_t number_fuzz()   { return Numerics::fuzz(); }
inline bool   number_form()   { return Numerics::form(); }
inline size_t number_fuzzydigits()   { return number_digits() - number_fuzz(); }
#endif