Why mapping source code is important, and how to benefit from that information?

The Mapping Of Source Code

Furthermore, the project should have unit tests to confirm and verify that the parser works as expected.

The projects should go through all the source code files

The code should follow the object-orientation paradigm, and then there should be Github history that can show the development.

The style is IEEE, and the report should be written in LatEx.

The research questions
-Why mapping source code is important, and how to benefit from that information?

-How to develop a multi-language parser?