I talk being able to transpile from one programming language source to another (java to rust, cobol to java and so on).
There is of course, option like ANTLR, though it leaves ground wide open after parsing.
IMHO having such tool can help renovate legacy codebases easier, minimize over focus on programming language decisioning in greenfield projects. Yet, despite noticing organizations always burdened with managing old codebases, surprisingly there aren't such tools built out in the open. Why? Do I mis-judge the demand space as being strong?