The following is a minimalistic Ruby implementation of a markdown compiler, it translates markdown to HTML.
For a full series on how this compiler works,
The main purpose of this library is to explain basic compiler design techniques so it's not made to be fast, but easy to read and understand.
For more information about the project, or if you are interested in learning how to write compilers from scratch, see the blog post series at Beezwax's blog.
To run tests just run rake.