UnaryScalarOperator.cs

using System.Threading.Tasks;
using Waher.Runtime.Collections;
using Waher.Script.Abstraction.Elements;
 
namespace Waher.Script.Model
{
    public abstract class UnaryScalarOperator : UnaryOperator
    {
        public UnaryScalarOperator(ScriptNode Operand, int Start, int Length, Expression Expression)
            : base(Operand, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(IElement Operand, Variables Variables)
        {
            if (Operand.IsScalar)
                return this.EvaluateScalar(Operand, Variables);
            else
            {
                ChunkedList<IElement> Result = new ChunkedList<IElement>();
 
                foreach (IElement Child in Operand.ChildElements)
                    Result.Add(this.Evaluate(Child, Variables));
 
                return Operand.Encapsulate(Result, this);
            }
        }
 
        public override async Task<IElement> EvaluateAsync(IElement Operand, Variables Variables)
        {
            if (Operand.IsScalar)
                return await this.EvaluateScalarAsync(Operand, Variables);
            else
            {
                ChunkedList<IElement> Result = new ChunkedList<IElement>();
 
                foreach (IElement Child in Operand.ChildElements)
                    Result.Add(await this.EvaluateAsync(Child, Variables));
 
                return Operand.Encapsulate(Result, this);
            }
        }
 
        public abstract IElement EvaluateScalar(IElement Operand, Variables Variables);
 
        public virtual Task<IElement> EvaluateScalarAsync(IElement Operand, Variables Variables)
        {
            return Task.FromResult<IElement>(this.EvaluateScalar(Operand, Variables));
        }
    }
}