Seems like the idea of exposing a programming language to the end-user should have better support so that it's more routine to create a restricted subset of som

Seems like the idea of exposing a programming language to the end-user should have better support so that it's more routine to create a restricted subset of something existing for users to put arbitrary code in. Something with both standardized textual interface and standardized structured editor interface would be great. I guess this was always the dream for LISP but it never got there.