IsBlank.cs

using Waher.Content.Semantic.Model;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Content.Semantic.Functions
{
    public class IsBlank : FunctionOneSemanticVariable
    {
        public IsBlank(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(IsBlank);
 
        public override IElement EvaluateScalar(ISemanticElement Argument, Variables Variables)
        {
            return Argument is BlankNode ? BooleanValue.True : BooleanValue.False;
        }
    }
}