Are there any tools that are capable of editing code but in different language?

To be more concrete, I want to parse java source file in editor, compile it to my language X, edit in X and compile back to java on save. Or edit pom.xml file using non-XML syntax.

Which editor or IDE would be easiest to use for implementing such prototype? Option to transform only a snippet would be ideal to limit effort on parsing.

For one example, Intellij IDEA can display anonymous class so it looks like lambda expression hiding some of boilerplate.