TestHtmlParser.cs

using AngleSharp.Html.Parser;
using AngleSharp;
using AngleSharp.Dom;
using System;
using Egil.RazorComponents.Testing.Diffing;

namespace Egil.RazorComponents.Testing.Diffing
{
    /// <summary>
    /// A AngleSharp based HTML Parse that can parse markup strings
    /// into a <see cref="INodeList"/>.
    /// </summary>
    public sealed class TestHtmlParser : IDisposable
    {
        private readonly IBrowsingContext _context;
        private readonly IHtmlParser _htmlParser;
        private readonly IDocument _document;

        /// <summary>
        /// Creates an instance of the parser with a AngleSharp context 
        /// without a <see cref="TestRenderer"/> registered.
        /// </summary>
        public TestHtmlParser()
        {
            var config = Configuration.Default
                .WithCss()
                .With(new HtmlComparer())
                .With(this);

            _context = BrowsingContext.New(config);
            _htmlParser = _context.GetService<IHtmlParser>();
            _document = _context.OpenNewAsync().Result;
        }

        /// <summary>
        /// Creates an instance of the parser with a AngleSharp context 
        /// with the <paramref name="testRenderer"/> and <paramref name="comparer"/> registered.
        /// </summary>
        /// <param name="testRenderer"></param>
        /// <param name="comparer"></param>
        public TestHtmlParser(TestRenderer testRenderer, HtmlComparer comparer)
        {
            var config = Configuration.Default
                .WithCss()
                .With(testRenderer)
                .With(comparer)
                .With(this);

            _context = BrowsingContext.New(config);
            _htmlParser = _context.GetService<IHtmlParser>();
            _document = _context.OpenNewAsync().Result;
        }

        /// <summary>
        /// Parses a markup HTML string using AngleSharps HTML5 parser.
        /// </summary>
        /// <param name="markup">The markup to parse.</param>
        /// <returns>The <see cref="INodeList"/>.</returns>
        public INodeList Parse(string markup)
        {
            return _htmlParser.ParseFragment(markup, _document.Body);
        }

        /// <inheritdoc/>
        public void Dispose()
        {
            _document.Dispose();
        }
    }
}