Compile time step detector

[janbarasek]

The compilation of extensions follows different stages. Within ContainerBuilder, there should be a getStep() method that returns the name of the current state (or the sequence number of the state or constant).

As an extension designer, I often deal with connections to other packages, where I want to give compile time the ability to influence how my services are written. For example, at the latest in the beforeCompile() method, I can add another addSetup() method to my service.

Is it easy to detect what stage of compilation we are in? For calls from some of my static methods, I need to throw an exception when it's too late to call and let the author know to fix his code.

Thanks.