sebastienros.jint/Jint/Native/Number/Dtoa/DtoaNumberFormatter.cs

#nullable disable

using System.Diagnostics;
using Jint.Runtime;

namespace Jint.Native.Number.Dtoa
{
    internal static class DtoaNumberFormatter
    {
        public static void DoubleToAscii(
            ref  DtoaBuilder buffer,
            double v,
            DtoaMode mode,
            int requested_digits,
            out bool negative,
            out int point)
        {
            Debug.Assert(!double.IsNaN(v));
            Debug.Assert(!double.IsInfinity(v));
            Debug.Assert(mode == DtoaMode.Shortest || requested_digits >= 0);

            point = 0;
            negative = false;
            buffer.Reset();

            if (v < 0)
            {
                negative = true;
                v = -v;
            }

            if (v == 0)
            {
                buffer[0] = '0';
                point = 1;
                return;
            }

            if (mode == DtoaMode.Precision && requested_digits == 0)
            {
                return;
            }

            bool fast_worked = false;
            switch (mode) {
                case DtoaMode.Shortest:
                    fast_worked = FastDtoa.NumberToString(v, DtoaMode.Shortest, 0, out point, ref buffer);
                    break;
                case DtoaMode.Fixed:
                    //fast_worked = FastFixedDtoa(v, requested_digits, buffer, length, point);
                    ExceptionHelper.ThrowNotImplementedException();
                    break;
                case DtoaMode.Precision:
                    fast_worked = FastDtoa.NumberToString(v, DtoaMode.Precision, requested_digits, out point, ref buffer);
                    break;
                default:
                    ExceptionHelper.ThrowArgumentOutOfRangeException();
                    return;
            }

            if (fast_worked)
            {
                return;
            }

            // If the fast dtoa didn't succeed use the slower bignum version.
            buffer.Reset();
            BignumDtoa.NumberToString(v, mode, requested_digits, ref buffer, out point);
       }
    }
}