Intersection.cs

using System;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Abstraction.Sets;
using Waher.Script.Model;
using Waher.Script.Objects.Sets;
 
namespace Waher.Script.Operators.Sets
{
    public class Intersection : BinaryOperator 
    {
        public Intersection(ScriptNode Left, ScriptNode Right, int Start, int Length, Expression Expression)
            : base(Left, Right, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            IElement L = this.left.Evaluate(Variables);
            if (!(L is ISet S1))
                S1 = new FiniteSet(new IElement[] { L });
 
            IElement R = this.right.Evaluate(Variables);
            if (!(R is ISet S2))
                S2 = new FiniteSet(new IElement[] { R });
 
            return new IntersectionSet(S1, S2);
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            if (!this.isAsync)
                return this.Evaluate(Variables);
 
            IElement L = await this.left.EvaluateAsync(Variables);
            if (!(L is ISet S1))
                S1 = new FiniteSet(new IElement[] { L });
 
            IElement R = await this.right.EvaluateAsync(Variables);
            if (!(R is ISet S2))
                S2 = new FiniteSet(new IElement[] { R });
 
            return new IntersectionSet(S1, S2);
        }
    }
}