Connected.Components/Utilities/BindingConverters/RangeConverter.cs

namespace Connected
{
   public class RangeConverter<T> : Converter<Components.Range<T>>
   {
      readonly DefaultConverter<T> _converter;

      public RangeConverter()
      {
         _converter = new DefaultConverter<T>();

         SetFunc = OnSet;
         GetFunc = OnGet;
      }

      private Components.Range<T> OnGet(string value)
      {
         if (!Split(value, out var valueStart, out var valueEnd))
            return null;

         return new Components.Range<T>(_converter.Get(valueStart), _converter.Get(valueEnd));
      }

      private string OnSet(Components.Range<T> arg)
      {
         if (arg == null)
            return string.Empty;

         return Join(_converter.Set(arg.Start), _converter.Set(arg.End));
      }

      public static string Join(string valueStart, string valueEnd)
      {
         if (string.IsNullOrEmpty(valueStart) && string.IsNullOrEmpty(valueEnd))
            return string.Empty;

         return $"[{valueStart};{valueEnd}]";
      }

      public static bool Split(string value, out string valueStart, out string valueEnd)
      {
         valueStart = valueEnd = string.Empty;

         if (string.IsNullOrEmpty(value) || value[0] != '[' || value[^1] != ']')
         {
            return false;
         }

         var idx = value.IndexOf(';');

         if (idx < 1)
         {
            return false;
         }

         valueStart = value[1..idx];
         valueEnd = value[(idx + 1)..^1];

         return true;
      }
   }
}