Is there a replacement for the global?
My goal is to have something really simple with as small an amount of code as possible. The real code is used to parse a text file of nested structures. Below is highly simplified but is the general way that the state machine would work.
# python doesn't support enums but can do this way
class state:
OUT = 0
DNARRAY = 1 # under "DN array" heading
CSTA_REQUEST = 2 # aPDU-rose : invoke :
CSTA_RESPONSE = 3 # aPDU-rose : retResult :
END_OF_FILE = 4
currentstate = state.OUT
def do_out():
print "doing OUT - transitioning to DNARRAY"
global currentstate
currentstate = state.DNARRAY
def do_dnarray():
print "doing dn array - transitioning to csta request"
global currentstate
currentstate = state.CSTA_REQUEST
def do_csta_request():
print "doing csta request - transitioning to csta response"
global currentstate
currentstate = state.CSTA_RESPONSE
def do_csta_response():
print "doing csta response - transitioning to END_OF_FILE"
global currentstate
currentstate = state.END_OF_FILE
statemap = {state.OUT : do_out,
state.DNARRAY : do_dnarray,
state.CSTA_REQUEST : do_csta_request,
state.CSTA_RESPONSE : do_csta_response,
}
def decisions():
while(currentstate != state.END_OF_FILE):
statemap[currentstate]()
print "done!"
decisions()
