Parser Parer is a web page that generates Inform 7 code for limiting the player's actions. Try it here: http://alice-blue.github.io/parser-parer/
For the up-to-date branch of this repo, see gh-pages.
Thanks to Caleb, CMG, Doug, jojo, Draconis, matt w, vlaviano, emshort, maga, furkle, and Robin for your ideas, suggestions, and technical help!