Utf8Decode.cs

using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Content.Functions.Encoding
{
    public class Utf8Decode : FunctionOneScalarVariable
    {
        public Utf8Decode(ScriptNode Data, int Start, int Length, Expression Expression)
            : base(Data, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(Utf8Decode);
 
        public override IElement EvaluateScalar(IElement Argument, Variables Variables)
        {
            if (!(Argument.AssociatedObjectValue is byte[] Bin))
                throw new ScriptRuntimeException("Binary data expected.", this);
 
            return new StringValue(System.Text.Encoding.UTF8.GetString(Bin));
        }
 
        public override Task<IElement> EvaluateScalarAsync(IElement Argument, Variables Variables)
        {
            return Task.FromResult(this.EvaluateScalar(Argument, Variables));
        }
 
    }
}