use Processing to control Arduino, So can I use Arduino's library in Processing?

I build a very complicated system which includes 4 servo motor and 2 stepper motor, but I want to use processing to control it, for example, I use my cellphone sending data to processing then I can rotate the servo motor.
But for stepper motor, I used to control it via stepper library in Arduino, I dont no is there any way to import Arduino library to processing?
thanks a lot.

I dont no is there any way to import Arduino library to processing?

There isn't. It's time for you to get rid of the crutches. Firmata is for stupid Arduinos. Stupid Arduinos do not drive stepper motors. Smart ones do. So, put the Arduino back to work being smart and forget that Firmata exists.

Define and implement your own protocol for exchanging data between Processing and the Arduino. You'll learn a lot.