fix: correct link path in navigation link on epub3 (#29)

vers-one · Sep 23, 2019 · 6ca3987 · 6ca3987
1 parent 3866e68
commit 6ca3987
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/Source/VersOne.Epub/Readers/Epub3NavDocumentReader.cs b/Source/VersOne.Epub/Readers/Epub3NavDocumentReader.cs
@@ -54,15 +54,35 @@ public static async Task<Epub3NavDocument> ReadEpub3NavDocumentAsync(ZipArchive
             {
                 throw new Exception("EPUB parsing error: navigation file does not contain body element.");
             }
+
             result.Navs = new List<Epub3Nav>();
+            string folder = ZipPathUtils.GetDirectoryPath(navManifestItem.Href);
+
             foreach (XElement navNode in bodyNode.Elements(xhtmlNamespace + "nav"))
             {
                 Epub3Nav epub3Nav = ReadEpub3Nav(navNode);
+                AdjustRelativePath(epub3Nav.Ol, folder);
                 result.Navs.Add(epub3Nav);
             }
             return result;
         }
 
+        private static void AdjustRelativePath(Epub3NavOl nav, string rootFolder)
+        {
+            if (nav == null) return;
+
+            foreach (var li in nav.Lis)
+            {
+                if  (li.Anchor?.Href != null && li.Anchor.Href.Length > 0 && li.Anchor.Href[0] != '/')
+                {
+                    var relativeHref = $"{rootFolder}/{li.Anchor.Href}";
+                    li.Anchor.Href = relativeHref;
+                }
+
+                AdjustRelativePath(li.ChildOl, rootFolder);
+            }
+        }
+
         private static Epub3Nav ReadEpub3Nav(XElement navNode)
         {
             Epub3Nav epub3Nav = new Epub3Nav();