SemanticConversionFunction.cs

using System.Threading.Tasks;
using Waher.Runtime.Inventory;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
 
namespace Waher.Script.Persistence.SPARQL.Functions.TypeConversion
{
    public abstract class SemanticConversionFunction : FunctionOneVariable, IExtensionFunction
    {
        public SemanticConversionFunction()
            : base(null, 0, 0, null)
        {
        }
 
        public SemanticConversionFunction(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public int MinArguments => 1;
 
        public int MaxArguments => 1;
 
        public ScriptNode CreateFunction(ScriptNode[] Arguments, int Start, int Length, Expression Expression)
        {
            return this.CreateFunction(Arguments[0], Start, Length, Expression);
        }
 
        public abstract ScriptNode CreateFunction(ScriptNode Argument, int Start, int Length, Expression Expression);
 
        public virtual Grade Supports(string Uri)
        {
            return Uri == this.FunctionName ? Grade.Ok : Grade.NotAtAll;
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            IElement Arg = this.Argument.Evaluate(Variables);
            return this.Convert(Arg.AssociatedObjectValue);
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            IElement Arg = await this.Argument.EvaluateAsync(Variables);
            return this.Convert(Arg.AssociatedObjectValue);
        }
 
        public override IElement Evaluate(IElement Argument, Variables Variables)
        {
            return this.Convert(Argument.AssociatedObjectValue);
        }
 
        public override Task<IElement> EvaluateAsync(IElement Argument, Variables Variables)
        {
            return Task.FromResult(this.Convert(Argument.AssociatedObjectValue));
        }
 
        public abstract IElement Convert(object Value);
    }
}