BigIntegerToDouble.cs

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