Beam/Beam.Dynamic/DataProviders/AnchorDataProvider.cs

using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Beam.Abstractions;

namespace Beam.Dynamic {
    public class AnchorDataProvider : IComposableDataProvider<string> {
        public IBinding? Content { get; set; }
        public Uri? RelativeTo { get; set; }

        public string Get(HtmlDocument document) {
            var node = Select(document);
            return node is null ? "" : Get(node);      
        }

        public virtual string Get(HtmlNode node) {
            if (Uri.TryCreate(RelativeTo, node.GetAttributeValue("href", ""), out var uri))
                return uri.AbsoluteUri;
            return "";       
        }
        public HtmlNode? Select(HtmlDocument doc) {
            return Content?.Select(doc);       
        }

        public HtmlNode? Select(HtmlNode node) {
            return node;
        }
    }
}