RoyalRoadL source improvements:

- Remove donation blocks
- Remove chapter-links-table added by author
- Remove too many linebreaks

WebNovelConverter/Sources/RoyalRoadLSource.cs

@@ -8,6 +8,7 @@
 using AngleSharp.Dom.Html;
 using AngleSharp.Extensions;
 using WebNovelConverter.Sources.Models;
+using System.Text.RegularExpressions;
 
 namespace WebNovelConverter.Sources
 {
@@ -65,23 +66,27 @@ public override async Task<WebNovelChapter> GetChapterAsync(ChapterLink link,
 
             IHtmlDocument doc = await Parser.ParseAsync(pageContent, token);
 
-            IElement firstPostElement = (from e in doc.All
+            IElement postBodyEl = (from e in doc.All
                                         where e.LocalName == "div"
                                         where e.HasAttribute("class")
                                         let classAttribute = e.GetAttribute("class")
                                         where classAttribute.Contains("post_body")
                                         select e).FirstOrDefault();
 
-            if (firstPostElement == null)
+            if (postBodyEl == null)
                 return null;
 
-            RemoveNavigation(firstPostElement);
-            ExpandSpoilers(firstPostElement);
+            RemoveNavigation(postBodyEl);
+            RemoveDonation(postBodyEl);
+            ExpandSpoilers(postBodyEl);
+            RemoveEmpyTags(postBodyEl);
+
+            var content = CleanupHTML(postBodyEl.InnerHtml);
 
             return new WebNovelChapter
             {
                 Url = link.Url,
-                Content = firstPostElement.InnerHtml
+                Content = content
             };
         }
 
@@ -104,7 +109,23 @@ where classAttribute.Contains("post_body")
 
         protected virtual void RemoveNavigation(IElement rootElement)
         {
-            rootElement.Descendents<IElement>().LastOrDefault(p => p.LocalName == "table")?.Remove();
+            // Last 1-2 tables might be navigation
+
+            foreach(var table in rootElement.QuerySelectorAll("table").Reverse().Take(2))
+            {
+                if( table.QuerySelectorAll("a").Any(x => x.TextContent.Contains("Chapter"))) {
+                    table.Remove();
+                }
+            }
+        }
+
+        protected virtual void RemoveDonation(IElement rootElement)
+        {
+            foreach (var el in rootElement.QuerySelectorAll("div.thead"))
+            {
+                if (el.TextContent.Contains("Donation for the Author"))
+                    el.Remove();
+            }
         }
 
         /// <summary>
@@ -128,5 +149,24 @@ protected void ExpandSpoilers(IElement rootElement)
                 el.Remove();
             }
         }
+
+        private void RemoveEmpyTags(IElement rootElement)
+        {
+            foreach (var el in rootElement.QuerySelectorAll("div,span"))
+            {
+                if (string.IsNullOrWhiteSpace(el.TextContent) && el.ChildElementCount == 0)
+                {
+                    el.Remove();
+                }
+            }
+        }
+
+        private string CleanupHTML(string html)
+        {
+            // Too many newlines sometimes
+            html = new Regex("(<br>\\s*){3,}").Replace(html, "<br /><br />");
+
+            return html.Trim();
+        }
     }
 }