DoubleToBigInteger.cs

using System;
using System.Numerics;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Objects;
 
namespace Waher.Script.TypeConversion
{
    public class DoubleToBigInteger : ITypeConverter
    {
        public Type From => typeof(double);
 
        public Type To => typeof(BigInteger);
 
        public object Convert(object Value)
        {
            if (Value is double d)
            {
                BigInteger i = (BigInteger)d;
                if (((double)i) == d)
                    return i;
                else
                    return null;
            }
            else
                throw new ArgumentException("Expected BigInteger value.", nameof(Value));
        }
 
        public IElement ConvertToElement(object Value)
        {
            if (Value is double d)
            {
                BigInteger i = (BigInteger)d;
                if (((double)i) == d)
                    return new Integer(i);
                else
                    return null;
            }
            else
                throw new ArgumentException("Expected double value.", nameof(Value));
        }
    }
}