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CommonMark for C# using CodeFluent Runtime


Markdown is a plain text language that can be converted to HTML. This language is well adopted: GitHub, StackOverflow, Reddit, some blogging platforms, and many others.

This language had no specification, so there were many different implementations. A few days ago, Standard Markdown, quickly renamed to Common Markdown, was born. This is the first specification of Markdown. At the same time, the C and JavaScript implementation was released:

At SoftFluent we though JavaScript is great but we are mostly using C# so there is no Common Markdown implementation.

We’re not providing a C# implementation as it would take time to develop and to maintain. Here, we want to show you how to call JavaScript code from C# using the CodeFluent Script Engine from the CodeFluent Runtime.

This is just a sample/preview and not aims to be used in production.

The full (but very short) code is available on GitHub: https://github.com/SoftFluent/SoftFluent.CommonMarkdown 

Here’s the main code:

private static readonly string _language = DetermineBestEngine();
private static string DetermineBestEngine()
{
    // use IE9+'s chakra engine?
    bool useChakra = ScriptEngine.GetVersion(ScriptEngine.ChakraClsid) != null;
    return useChakra ? ScriptEngine.ChakraClsid : ScriptEngine.JavaScriptLanguage;
}
string method = @"
    function markdownToHtml(text) {
        var reader = new stmd.DocParser();
        var writer = new stmd.HtmlRenderer();
        var parsed = reader.parse(text);
        return writer.render(parsed);
    };";

using (ScriptEngine engine = new ScriptEngine(_language))
using (ParsedScript parsed = engine.Parse(File.ReadAllText("stdm.js") + method))
    return (string)parsed.CallMethod("markdownToHtml", engine.Eval(EncodeJavaScriptString(text)));

And how to use it:

Markdown.ToHtml(@"# Hello there
This is a paragraph.
- one
- two
- three
- four
1. pirate
2. ninja
3. zombie")

This code gives the following result :

<h1>Hello there</h1>
<p>This is a paragraph.</p>
<ul>
  <li>one</li>
  <li>two</li>
  <li>three</li>
  <li>four</li>
</ul>
<ol>
  <li>pirate</li>
  <li>ninja</li>
  <li>zombie</li>
</ol>

CodeFluent Runtime Client is free and available from NuGet. This package contains lots of useful class such as the ScriptEngine.

Have fun with Markdown,

The R&D Team

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