ScriptFile.cs

using System.IO;
using System.Threading.Tasks;
using Waher.Runtime.IO;
using Waher.Script;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
 
namespace Waher.Content.Markdown.Functions
{
    public class ScriptFile : FunctionOneScalarStringVariable
    {
        public ScriptFile(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(ScriptFile);
 
        public override string[] DefaultArgumentNames => new string[] { "FileName" };
 
        public override bool IsAsynchronous => true;
 
        public override IElement EvaluateScalar(string Argument, Variables Variables)
        {
            return this.EvaluateScalarAsync(Argument, Variables).Result;
        }
 
        public override async Task<IElement> EvaluateScalarAsync(string Argument, Variables Variables)
        {
            string Source = this.Expression.Source;
            if (string.IsNullOrEmpty(Source))
                throw new ScriptRuntimeException("Script has no source.", this);
 
            Source = Path.Combine(Source, Argument);
 
            string Script = await Files.ReadAllTextAsync(Source);
            Expression Exp = new Expression(Script, Source);
 
            return await Exp.Root.EvaluateAsync(Variables);
        }
    }
}