MOC is a compiler for a subset of the Objective-C language.
MOC is made with a special version of EGG (Extended Generator Generator) : https://github.com/arthaud/egg/tree/new-syntax
To build the project, you only need java.
Just run make in the root directory.
There are examples of MOC source files in the tests directory.
You can compile them with mocc.
See ./mocc -h for more information.