GetUserSetting.cs

using System.Threading.Tasks;
using Waher.Runtime.Settings;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Content.Functions.InputOutput;
using Waher.Script.Exceptions;
using Waher.Script.Model;
 
namespace Waher.Script.Persistence.Functions
{
    public class GetUserSetting : FunctionMultiVariate
    {
        public GetUserSetting(ScriptNode User, ScriptNode Name, ScriptNode DefaultValue, int Start, int Length, Expression Expression)
            : base(new ScriptNode[] { User, Name, DefaultValue }, argumentTypes3Scalar, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(GetUserSetting);
 
        public override string[] DefaultArgumentNames => new string[] { "User", "Name", "DefaultValue" };
 
        public override bool IsAsynchronous => true;
 
        public override IElement Evaluate(IElement[] Arguments, Variables Variables)
        {
            return this.EvaluateAsync(Arguments, Variables).Result;
        }
 
        public override async Task<IElement> EvaluateAsync(IElement[] Arguments, Variables Variables)
        {
            string User = await GetSetting.GetUser(Arguments[0].AssociatedObjectValue, this);
 
            if (string.IsNullOrEmpty(User))
                throw new ScriptRuntimeException("User not defined.", this);
 
            string Name = ToString(Arguments[1]);
            object DefaultValue = Arguments[2].AssociatedObjectValue;
            object Result;
 
            Result = await UserSettings.GetAsync(User, Name, DefaultValue);
 
            return Expression.Encapsulate(Result);
        }
    }
}