UserDefinedOptions.cs

using System;
using System.Collections.Generic;
using System.Text;
 
namespace Waher.Content.Asn1.Model.Macro
{
    public class UserDefinedOptions : UserDefinedItem
    {
        private readonly UserDefinedItem[] options;
 
        public UserDefinedOptions(UserDefinedItem[] Options)
        {
            this.options = Options;
        }
 
        public UserDefinedItem[] Options => this.options;
 
        public override Asn1Node Parse(Asn1Document Document, Asn1Macro Macro)
        {
            int Bak = Document.pos;
            int BestPos = -1;
            Asn1Node Best = null;
            Asn1Node Option;
 
            foreach (UserDefinedItem Item in this.options)
            {
                Document.pos = Bak;
 
                try
                {
                    Option = Item.Parse(Document, Macro);
                    if (Best is null || Document.pos > BestPos)
                    {
                        BestPos = Document.pos;
                        Best = Option;
                    }
                }
                catch (Exception)
                {
                    // Ignore
                }
            }
 
            if (BestPos < 0)
                throw Document.SyntaxError("Invalid option.");
 
            Document.pos = BestPos;
 
            return Best;
        }
    }
}