FunctionOneSemanticVariable.cs

using System.Threading.Tasks;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
 
namespace Waher.Content.Semantic.Functions
{
    public abstract class FunctionOneSemanticVariable : FunctionOneScalarVariable
    {
        public FunctionOneSemanticVariable(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override IElement EvaluateScalar(IElement Argument, Variables Variables)
        {
            if (Argument is ISemanticElement Element)
                return this.EvaluateScalar(Element, Variables);
            else
                throw new ScriptRuntimeException("Expected a semantic element.", this);
        }
 
        public override Task<IElement> EvaluateScalarAsync(IElement Argument, Variables Variables)
        {
            if (Argument is ISemanticElement Element)
                return this.EvaluateScalarAsync(Element, Variables);
            else
                throw new ScriptRuntimeException("Expected a semantic element.", this);
        }
 
        public abstract IElement EvaluateScalar(ISemanticElement Argument, Variables Variables);
 
        public virtual Task<IElement> EvaluateScalarAsync(ISemanticElement Argument, Variables Variables)
        {
            return Task.FromResult(this.EvaluateScalar(Argument, Variables));
        }
    }
}