CountEvaluator.cs

using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Functions.Vectors
{
    public class CountEvaluator : UnaryIterativeEvaluator
    {
        private long count = 0;
 
        public CountEvaluator(Count Node)
            : base(Node.Arguments[0])
        {
        }
 
        public override void RestartEvaluator()
        {
            this.count = 0;
        }
 
        public override bool UsesElement => false;
 
        public override void AggregateElement(IElement Element)
        {
            this.count++;
        }
 
        public override IElement GetAggregatedResult()
        {
            return new DoubleNumber(this.count);
        }
    }
}