number.hpp

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 * Copyright (c) 2023-2025 NWSOFT                                                                 *
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#pragma once
 
#include "testing.hpp"
#include "util.hpp"
 
#include <cstdint>
#include <string>
#include <utility>

namespace steppable
{
    enum class RoundingMode : std::uint8_t
    {
        USE_MAXIMUM_PREC = 0xFF,

        USE_MINIMUM_PREC = 0x01,

        USE_CURRENT_PREC = 0x02,

        USE_OTHER_PREC = 0x03,

        DISCARD_ALL_DECIMALS = 0x00
    };
 
    enum class Rounding : std::uint8_t
    {
        ROUND_DOWN = 0x00, 
        ROUND_UP = 0x01, 
        ROUND_OFF = 0x02, 
    };

    class Number
    {
        std::string value;

        size_t prec;

        RoundingMode mode = RoundingMode::USE_CURRENT_PREC;
 
        template<__internals::utils::StringLiteral fnName>
        [[nodiscard]] size_t determinePrec(const Number& rhs) const
        {
            size_t usePrec = 0;
            if (mode == RoundingMode::USE_MAXIMUM_PREC)
                usePrec = std::max(prec, rhs.prec);
            else if (mode == RoundingMode::USE_MINIMUM_PREC)
                usePrec = std::min(prec, rhs.prec);
            else if (mode == RoundingMode::USE_CURRENT_PREC)
                usePrec = prec;
            else if (mode == RoundingMode::USE_OTHER_PREC)
                usePrec = rhs.prec;
            else if (mode == RoundingMode::DISCARD_ALL_DECIMALS)
                usePrec = 0;
            else
            {
                usePrec = 0;
                output::warning(std::string(fnName.value), "Invalid precision specified"s);
            }
 
            return usePrec;
        }
 
    public:
        Number();
 
        Number(const Number& rhs);

        Number(std::string value = "0", size_t prec = 10, RoundingMode mode = RoundingMode::USE_CURRENT_PREC);

        template<concepts::Numeric ValueT>
        Number(ValueT value, size_t prec = 10, RoundingMode mode = RoundingMode::USE_CURRENT_PREC) :
            value(std::to_string(value)), prec(prec), mode(mode)
        {
        }
 
        void set(std::string newVal) { value = std::move(newVal); }
 
        void setPrec(size_t newPrec, RoundingMode mode = RoundingMode::USE_CURRENT_PREC)
        {
            this->mode = mode;
            prec = newPrec;
        }

        Number operator+(const Number& rhs) const;

        Number operator-(const Number& rhs) const;

        Number operator*(const Number& rhs) const;

        Number operator/(const Number& rhs) const;

        [[nodiscard]] Number mod(const Number& rhs) const;

        Number operator%(const Number& rhs) const;

        Number operator^(const Number& rhs);

        Number& operator+=(const Number& rhs);

        Number& operator-=(const Number& rhs);

        Number& operator*=(const Number& rhs);

        Number& operator/=(const Number& rhs);

        Number& operator%=(const Number& rhs);

        Number& operator^=(const Number& rhs);

        bool operator==(const Number& rhs) const;

        bool operator!=(const Number& rhs) const;

        bool operator<(const Number& rhs) const;

        bool operator>(const Number& rhs) const;

        bool operator<=(const Number& rhs) const;

        bool operator>=(const Number& rhs) const;

        Number operator++();

        Number operator--();

        Number operator-() const;

        Number operator+() const;

        [[nodiscard]] std::string present() const;
    };

    namespace literals
    {
        inline Number operator""_n(long double value) { return Number(value); }
 
        inline Number operator""_n(unsigned long long value) { return Number(value); }
    } // namespace literals
} // namespace steppable