Unable to render HTML from Markdown

Question

I am going through an online course on Laravel. This course is using the League\commonmark package for converting markdown to html.

Whenever the package is used in the app, I get:

 Unable to find corresponding renderer for block type League\CommonMark\Block\Element\Document 

The app uses the following presenter to do the conversion.

 class PagePresenter extends AbstractPresenter
{
  protected $markdown;

  public function __construct($object, CommonMarkConverter $markdown)
  {
    $this->markdown = $markdown;
    parent::__construct($object);
  }

   public function contentHtml()
   {
    return $this->markdown->convertToHtml($this->content);
   } 
}

Can anyone point me in the right direction?

Answer 1

That happens because the IoC is resolving the dependencies for CommonMarkConverter, specifically Environment which is instantiated with all null properties.

You can probably resolve this by using a Laravel specific integration: https://github.com/GrahamCampbell/Laravel-Markdown

Or you can bind and instance to the service container this way:

In your AppServiceProvider, register method add this:

$this->app->singleton('Markdown', function ($app) {

    // Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
    $environment = \League\CommonMark\Environment::createCommonMarkEnvironment();

    // Define your configuration:
    $config = ['html_input' => 'escape'];

    // Create the converter
    return new \League\CommonMark\CommonMarkConverter($config, $environment);
});

Now remove CommonMarkConverter from your Presenter constructor add use app('Markdown'):

class PagePresenter extends AbstractPresenter {
  protected $markdown;

  public function __construct($object)
  {
    $this->markdown = app('Markdown');
    parent::__construct($object);
  }

   public function contentHtml()
   {
    return $this->markdown->convertToHtml($this->content);
   } 
}