PrintLine.cs

using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Functions.Runtime
{
    public class PrintLine : FunctionOneVariable
    {
        public PrintLine(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public PrintLine(int Start, int Length, Expression Expression)
            : base(new ConstantElement(new StringValue(string.Empty), Start, Length, Expression),
                  Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(PrintLine);
 
        public override string[] Aliases
        {
            get { return new string[] { "println" }; }
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            IElement E = this.Argument.Evaluate(Variables);
            string Msg = E.AssociatedObjectValue is string s ? s : E.ToString();
            Variables.ConsoleOut?.WriteLine(Msg);
            return E;
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            IElement E = await this.Argument.EvaluateAsync(Variables);
            string Msg = E.AssociatedObjectValue is string s ? s : E.ToString();
            Variables.ConsoleOut?.WriteLine(Msg);
            return E;
        }
 
        public override IElement Evaluate(IElement Argument, Variables Variables)
        {
            return ObjectValue.Null;
        }
    }
}