/Demo/threads/fcmp.py
http://unladen-swallow.googlecode.com/ · Python · 64 lines · 52 code · 7 blank · 5 comment · 14 complexity · 6bf1855c55855eb59d00c14af2e2a21d MD5 · raw file
- # Coroutine example: controlling multiple instances of a single function
- from Coroutine import *
- # fringe visits a nested list in inorder, and detaches for each non-list
- # element; raises EarlyExit after the list is exhausted
- def fringe(co, list):
- for x in list:
- if type(x) is type([]):
- fringe(co, x)
- else:
- co.back(x)
- def printinorder(list):
- co = Coroutine()
- f = co.create(fringe, co, list)
- try:
- while 1:
- print co.tran(f),
- except EarlyExit:
- pass
- print
- printinorder([1,2,3]) # 1 2 3
- printinorder([[[[1,[2]]],3]]) # ditto
- x = [0, 1, [2, [3]], [4,5], [[[6]]] ]
- printinorder(x) # 0 1 2 3 4 5 6
- # fcmp lexicographically compares the fringes of two nested lists
- def fcmp(l1, l2):
- co1 = Coroutine(); f1 = co1.create(fringe, co1, l1)
- co2 = Coroutine(); f2 = co2.create(fringe, co2, l2)
- while 1:
- try:
- v1 = co1.tran(f1)
- except EarlyExit:
- try:
- v2 = co2.tran(f2)
- except EarlyExit:
- return 0
- co2.kill()
- return -1
- try:
- v2 = co2.tran(f2)
- except EarlyExit:
- co1.kill()
- return 1
- if v1 != v2:
- co1.kill(); co2.kill()
- return cmp(v1,v2)
- print fcmp(range(7), x) # 0; fringes are equal
- print fcmp(range(6), x) # -1; 1st list ends early
- print fcmp(x, range(6)) # 1; 2nd list ends early
- print fcmp(range(8), x) # 1; 2nd list ends early
- print fcmp(x, range(8)) # -1; 1st list ends early
- print fcmp([1,[[2],8]],
- [[[1],2],8]) # 0
- print fcmp([1,[[3],8]],
- [[[1],2],8]) # 1
- print fcmp([1,[[2],8]],
- [[[1],2],9]) # -1
- # end of example