Identifying language constructs

[Lab User <invalid@uah.edu>]

Hi
I need a way to programically recognise basic construct of the following
languages:
Ada, C, C++, Java.
I need to recognise comments statements, declarations, assignments,
function calls,
other operations, class declarations, list of inherited methods for the
class,
list of newly defined methods, correctly recognise if a class is defined
inside other class, etc.

Any suggestion how to do it?
Any ideas for any of the listed (or other) languages ?

Thanks a lot