textual representation of the module

It would be nice to have the ability to generate the textual representation of the module (a program as text in the given language) and parse the module from its text representation.

There is a way to define a generator for a language, and therefore it's possible to define the textual representation of the language, let's say 'export' the model. Will it be possible to define the language<->text transformation and parse the module from text?

What I want to achieve is e.g. use mps to edit programs in any given 'classic' text-based language (pick one - e.g. IDL) but using custom editors for concepts of the language.