It seems to be handcrafted. https://github.com/munificent/craftinginterpreters/tree/master/tool https://github.com/munificent/craftinginterpreters/tree/mast...

It seems to be handcrafted. https://github.com/munificent/craftinginterpreters/tree/master/tool https://github.com/munificent/craftinginterpreters/tree/mast... Custom dart code to convert and process markdown.