This is why I said the ideal would be a non ambiguous mapping: so that the text and visual code is equal and you can convert between them as you please. Unfortunately, this dream is unlikely.

I can't imagine this being possible with two humans looking at the same visual display/image and aligning on its "true meaning" let a lone an automated system doing it. Reduce the problem down to a fixed set of visuals with mapped meanings to AST and you can get there but then you are a vastly limited "language" of functions and that explodes into a horrible and complex visual tree to get any non trivial complexity described.