We are have some own Pascal-like language for oracle db. But all it texts is just plain texts, not AST as MPS required. And I think it is good idea to use MPS as editor for this language, but i didn't find how can i load plain text as AST of custom MPS language. Only i did find is 'Convert java to MPS' button in MPS Idea plugin. Is there an option to write own parser to load text of custom language to MPS AST of it, and after all save MPS AST to text of this custom language to save it under git. Is this possible use MPS in this way? Thank you!