SByte.cs

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