private static MarkDownNode TextToMarkDown(HtmlNode htmlNode, MarkDownNode markdownNode)
{
var text = System.Text.RegularExpressions.Regex.Replace(htmlNode.InnerText, "\\s+", " ");
return(markdownNode.Append(new TextMarkDownNode {
Text = WebUtility.HtmlDecode(text)
}));
}
static MarkDownDocument()
{
ElementConverters = new Dictionary <string, Func <HtmlNode, MarkDownNode, MarkDownNode> > {
{ "p", (htmlNode, markdownNode) => markdownNode.Append(new ParagraphMarkDownNode()) },
{ "b", (htmlNode, markdownNode) => markdownNode.Append(new BoldMarkDownNode()) },
{ "strong", (htmlNode, markdownNode) => markdownNode.Append(new BoldMarkDownNode()) },
{ "i", (htmlNode, markdownNode) => markdownNode.Append(new ItalicMarkDownNode()) },
{ "em", (htmlNode, markdownNode) => markdownNode.Append(new ItalicMarkDownNode()) },
{ "a", (htmlNode, markdownNode) => markdownNode = markdownNode.Append(new LinkMarkDownNode {
Href = AttrValue(htmlNode, "href")
}) },
{ "img", (htmlNode, markdownNode) => markdownNode.Append(new ImageMarkDownNode {
Alt = AttrValue(htmlNode, "alt"), Src = AttrValue(htmlNode, "src")
}) },
{ "div", (htmlNode, markdownNode) => markdownNode.Append(new DivMarkDownNode()) },
{ "br", (htmlNode, markdownNode) => markdownNode.Append(new BreakMarkDownNode()) },
{ "tr", (htmlNode, markdownNode) => markdownNode.Append(new BreakMarkDownNode()) },
{ "hr", (htmlNode, markdownNode) => markdownNode.Append(new HorizontalRuleMarkDownNode()) },
{ "h1", (htmlNode, markdownNode) => markdownNode.Append(new HeadingMarkDownNode(1)) },
{ "h2", (htmlNode, markdownNode) => markdownNode.Append(new HeadingMarkDownNode(2)) },
{ "h3", (htmlNode, markdownNode) => markdownNode.Append(new HeadingMarkDownNode(3)) },
{ "h4", (htmlNode, markdownNode) => markdownNode.Append(new HeadingMarkDownNode(4)) },
{ "h5", (htmlNode, markdownNode) => markdownNode.Append(new HeadingMarkDownNode(5)) },
{ "blockquote", (htmlNode, markdownNode) => markdownNode.Append(new BlockquoteMarkDownNode()) },
{ "ul", (htmlNode, markdownNode) => markdownNode.Append(new UnorderdListMarkDownNode()) },
{ "ol", (htmlNode, markdownNode) => markdownNode.Append(new OrderdListMarkDownNode()) },
{ "li", (htmlNode, markdownNode) => markdownNode.Append(new ListItemMarkDownNode()) },
{ "style", (htmlNode, markdownNode) => markdownNode.Append(new EmptyMarkdownNode()) },
{ "script", (htmlNode, markdownNode) => markdownNode.Append(new EmptyMarkdownNode()) },
{ "pre", (htmlNode, markdownNode) => markdownNode.Append(new PreMarkdownNode()) },
{ "code", (htmlNode, markdownNode) =>
{
var parentNodeName = htmlNode.ParentNode.Name;
var code = WebUtility.HtmlDecode(htmlNode.InnerText);
MarkDownNode node = markdownNode.Append(parentNodeName.ToLowerInvariant().Equals("pre") ? new CodeMarkdownNode(code) : new InlineCodeMarkdownNode(code));
node.HasChildNodes = false;
return(node);
} },
{ "table", (htmlNode, markdownNode) => markdownNode.Append(new TableMarkdownNode(htmlNode.ExtractTable())) },
{ "#text", TextToMarkDown },
};
}
private static void HtmlNodeToMarkDownNode(
HtmlNode htmlNode,
MarkDownNode markdownNode,
Dictionary <string, Func <HtmlNode, MarkDownNode, MarkDownNode> > elementConverters)
{
Func <HtmlNode, MarkDownNode, MarkDownNode> elementConverter;
if (elementConverters.TryGetValue(htmlNode.Name.ToLowerInvariant(), out elementConverter))
{
markdownNode = elementConverter(htmlNode, markdownNode);
}
if (markdownNode.HasChildNodes)
{
foreach (var childNode in htmlNode.ChildNodes)
{
HtmlNodeToMarkDownNode(childNode, markdownNode, elementConverters);
}
}
}
public static string FromHtml(string html, Dictionary<string, Func<HtmlAgilityPack.HtmlNode, MarkDownNode, MarkDownNode>> customElementConverters)
{
var elementConverters = ElementConverters;
if (customElementConverters != null)
{
foreach (var conveter in customElementConverters)
{
elementConverters[conveter.Key] = conveter.Value;
}
}
var htmlDocument = new HtmlAgilityPack.HtmlDocument();
htmlDocument.LoadHtml(html);
var body = htmlDocument.DocumentNode.SelectSingleNode("//body");
var mardownDocumentNode = new MarkDownNode();
HtmlNodeToMarkDownNode(body ?? htmlDocument.DocumentNode, mardownDocumentNode, elementConverters);
return mardownDocumentNode.ToString();
}
public static string FromHtml(string html, Dictionary <string, Func <HtmlNode, MarkDownNode, MarkDownNode> > customElementConverters)
{
var elementConverters = ElementConverters;
if (customElementConverters != null)
{
foreach (var conveter in customElementConverters)
{
elementConverters[conveter.Key] = conveter.Value;
}
}
var htmlDocument = new HtmlDocument();
htmlDocument.LoadHtml(html);
var body = htmlDocument.DocumentNode.SelectSingleNode("//body");
var mardownDocumentNode = new MarkDownNode();
HtmlNodeToMarkDownNode(body ?? htmlDocument.DocumentNode, mardownDocumentNode, elementConverters);
return(mardownDocumentNode.ToString());
}
public MarkDownNode Append(MarkDownNode node)
{
node.Parent = this;
ChildNodes.Add(node);
return(node);
}
private static void HtmlNodeToMarkDownNode(HtmlAgilityPack.HtmlNode htmlNode, MarkDownNode markdownNode, Dictionary<string, Func<HtmlAgilityPack.HtmlNode, MarkDownNode, MarkDownNode>> elementConverters)
{
Func<HtmlAgilityPack.HtmlNode, MarkDownNode, MarkDownNode> elementConverter;
if (elementConverters.TryGetValue(htmlNode.Name.ToLowerInvariant(), out elementConverter))
{
markdownNode = elementConverter(htmlNode, markdownNode);
}
foreach (var childNode in htmlNode.ChildNodes)
{
HtmlNodeToMarkDownNode(childNode, markdownNode, elementConverters);
}
}
private static MarkDownNode TextToMarkDown(HtmlAgilityPack.HtmlNode htmlNode, MarkDownNode markdownNode)
{
var text = System.Text.RegularExpressions.Regex.Replace(htmlNode.InnerText, "\\s+", " ");
return markdownNode.Append(new TextMarkDownNode { Text = WebUtility.HtmlDecode(text) });
}
public MarkDownNode Append(MarkDownNode node)
{
node.Parent = this;
ChildNodes.Add(node);
return node;
}