/// <summary>
/// Replaces all {TOC} tokens with the HTML for the table of contents. This method also inserts
/// anchored name tags before each H1,H2,H3 etc. tag that the contents references.
/// </summary>
public string InsertToc(string html)
{
if (!html.Contains("{TOC}"))
return html;
_tree = new Tree(_template);
// Parse the HTML for H tags
HtmlDocument document = new HtmlDocument();
document.LoadHtml(html);
HtmlNodeCollection elements = document.DocumentNode.ChildNodes;
ParseHTagsAndAddAnchors(document.DocumentNode);
string outputHtml = GenerateHtml();
string innerHtml = document.DocumentNode.InnerHtml;
// make sure {{TOC}} or {{{{TOC}}}} aren't matched
innerHtml = _regex.Replace(innerHtml, outputHtml);
return document.DocumentNode.InnerHtml = innerHtml;
}