Byte.cs

using System;
using System.IO;
using System.Threading.Tasks;
using System.Xml;
using Waher.Script;
 
namespace TAG.Simulator.ObjectModel.Values.BinaryElements
{
    public class Byte : SimulationNode, IBinaryElement
    {
        private System.Byte? value;
        private Expression script;
 
        public Byte(ISimulationNode Parent, Model Model)
            : base(Parent, Model)
        {
        }
 
        public override string LocalName => nameof(Byte);
 
        public override ISimulationNode Create(ISimulationNode Parent, Model Model)
        {
            return new Byte(Parent, Model);
        }
 
        public override Task FromXml(XmlElement Definition)
        {
            if (System.Byte.TryParse(Definition.InnerText, out System.Byte Value))
            {
                this.value = Value;
                this.script = null;
            }
            else
            {
                this.value = null;
                this.script = new Expression(Definition.InnerText);
            }
 
            return Task.CompletedTask;
        }
 
        public async Task Append(MemoryStream Output, Variables Variables)
        {
            object Result;
 
            Output.WriteByte(this.value ?? 
                ((Result = await this.script.EvaluateAsync(Variables)) is System.Byte Value ? Value : 
                Convert.ToByte(Result)));
        }
    }
}