Use case for "Why did you need an JS AST tree?"

[ttback]

The key is I'd need to reference back to Erlang's line and col or indexed [startOf, endOf] information and save it as part of the Mozilla AST data structure to be used in a thrid-party web application. Basically some kind of a source map between erlang to js generated.

It was originally why i was checking on the Luuvscript: http://luvv.ie/toolchain.html

Basically the scenario is that I need to be able to execute the code on the web and notify the user that at line 5 of Erlang code, they made an error. I wonder if there is any way you can preserve the range info. It would need to be a JS range: Erlang range map or just directly translating the Erlang AST to Mozilla JS AST before encoding it to JS.

An example of JS AST here: http://esprima.org/demo/parse.html#