A previous version of the Vista Smalltalk interpreter used a Javascript-like syntax, and I still have the Antlr syntax for it. It should be fairly simple to modify it for ActionScript.

The interpreter is designed for (hopefully) running in WPF/e.

https://vistasmalltalk.wordpress.com/
http://vistascript.net/vistascript/docuwiki/doku.php

Time to sell your Adobe shares!