StringToBoolean.cs

using System;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Objects;
 
namespace Waher.Script.TypeConversion.FromString
{
    public class StringToBoolean : ITypeConverter
    {
        public Type From => typeof(string);
 
        public Type To => typeof(bool);
 
        public double Weight => 0.9;
 
        public bool TryConvert(object Value, out object Result)
        {
            if (Value is string s)
            {
                switch (s.ToLower())
                {
                    case "1":
                    case "true":
                    case "yes":
                    case "on":
                        Result = true;
                        return true;
 
                    case "0":
                    case "false":
                    case "no":
                    case "off":
                        Result = false;
                        return true;
                }
            }
 
            Result = null;
            return false;
        }
 
        public bool TryConvertToElement(object Value, out IElement Result)
        {
            if (this.TryConvert(Value, out object d) && d is bool b)
            {
                Result = new BooleanValue(b);
                return true;
            }
 
            Result = null;
            return false;
        }
    }
}