Before I dive into the method behind this module let me explain the use case. Our client had very little time and required at first a simple way to attribute a score (numeric value) per entity type field instance. The total score for the submitted entity is then calculated from each field score where a value has been entered. Finally these are displayed in an administrative view with a comparison to the total amount of points possible for that entity.
Editr is an online code playground editor built with ace.js by Idered (Kasper Mikiewicz). Editr is a fantastic way to demonstrate code providing syntax highlighting, code tips & previews. Further Editr can be hosted locally allowing easy extension. Integrating Editr into Drupal was tedious at first with the jQuery requirements set fairly high; thank you maintainers of the jQuery update module, your awesome. As it stands this is only a proof of concept and should not be used on a live production site etc.