SourceDefinition.cs

using System;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Persistence.SQL
{
    public abstract class SourceDefinition : ScriptNode
    {
        public SourceDefinition(int Start, int Length, Expression Expression)
            : base(Start, Length, Expression)
        {
        }
 
        public abstract Task<IDataSource> GetSource(Variables Variables);
 
        public override IElement Evaluate(Variables Variables)
        {
            return ObjectValue.Null;    // Node not evaluated directly.
        }
 
        public override Task<IElement> EvaluateAsync(Variables Variables)
        {
            return Task.FromResult<IElement>(ObjectValue.Null);    // Node not evaluated directly.
        }
    }
}