Evaluate.cs

using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
 
namespace Waher.Script.Functions.Strings
{
    public class Evaluate : FunctionOneScalarStringVariable
    {
        public Evaluate(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(Evaluate);
 
        public override string[] Aliases => new string[] { "eval" };
 
        public override bool IsAsynchronous => true;
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            return this.EvaluateScalarAsync(Argument, Variables).Result;
        }
 
        public override async Task<IElement> EvaluateScalarAsync(string Argument, Variables Variables)
        {
            Expression Exp = new Expression(Argument, this.Expression.Source);
 
            try
            {
                return await Exp.Root.EvaluateAsync(Variables);
            }
            catch (ScriptReturnValueException ex)
            {
                return ex.ReturnValue;
            }
        }
    }
}