Eval.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using System.Xml;
using Waher.Script;
 
namespace TAG.Simulator.ObjectModel.Activities
{
    public class Eval : ActivityNode
    {
        private string script;
        private Expression expression;
 
        public Eval(ISimulationNode Parent, Model Model)
            : base(Parent, Model)
        {
        }
 
        public string Script => this.script;
 
        public Expression Expression => this.expression;
 
        public override string LocalName => nameof(Eval);
 
        public override ISimulationNode Create(ISimulationNode Parent, Model Model)
        {
            return new Eval(Parent, Model);
        }
 
        public override Task FromXml(XmlElement Definition)
        {
            this.script = Values.Script.RemoveIndent(Definition.InnerText);
            this.expression = new Expression(this.script);
 
            return base.FromXml(Definition);
        }
 
        public override bool ParseChildren => false;
 
        public override async Task<LinkedListNode<IActivityNode>> Execute(Variables Variables)
        {
            await this.expression.EvaluateAsync(Variables);
            return null;
        }
 
        public override void ExportPlantUml(StreamWriter Output, int Indentation, char QuoteChar)
        {
            ExportPlantUml(this.script, Output, Indentation, QuoteChar, true);
        }
 
        public static void ExportPlantUml(string Script, StreamWriter Output, int Indentation, char QuoteChar, bool Delimiters)
        {
            bool First = true;
 
            if (QuoteChar != '"')
                Script = Script.Replace('"', QuoteChar);
 
            foreach (string Row in Script.Replace("\r\n", "\n").Replace("\r", "\n").Split('\n'))
            {
                if (First)
                {
                    if (Delimiters)
                    {
                        Indent(Output, Indentation);
                        Output.Write(':');
                    }
 
                    First = false;
                }
                else
                    Output.Write("\\n");
 
                if (!string.IsNullOrEmpty(Row))
                    Output.Write(Row.Replace("\t", "\\t"));
            }
 
            if (!First && Delimiters)
                Output.WriteLine(";");
        }
    }
}