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# Coroutine example: controlling multiple instances of a single function |
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from Coroutine import * |
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# fringe visits a nested list in inorder, and detaches for each non-list |
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# element; raises EarlyExit after the list is exhausted |
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def fringe(co, list): |
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for x in list: |
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if type(x) is type([]): |
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fringe(co, x) |
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else: |
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co.back(x) |
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def printinorder(list): |
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co = Coroutine() |
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f = co.create(fringe, co, list) |
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try: |
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while 1: |
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print co.tran(f), |
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except EarlyExit: |
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pass |
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print |
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printinorder([1,2,3]) # 1 2 3 |
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printinorder([[[[1,[2]]],3]]) # ditto |
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x = [0, 1, [2, [3]], [4,5], [[[6]]] ] |
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printinorder(x) # 0 1 2 3 4 5 6 |
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# fcmp lexicographically compares the fringes of two nested lists |
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def fcmp(l1, l2): |
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co1 = Coroutine(); f1 = co1.create(fringe, co1, l1) |
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co2 = Coroutine(); f2 = co2.create(fringe, co2, l2) |
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while 1: |
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try: |
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v1 = co1.tran(f1) |
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except EarlyExit: |
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try: |
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v2 = co2.tran(f2) |
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except EarlyExit: |
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return 0 |
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co2.kill() |
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return -1 |
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try: |
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v2 = co2.tran(f2) |
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except EarlyExit: |
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co1.kill() |
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return 1 |
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if v1 != v2: |
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co1.kill(); co2.kill() |
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return cmp(v1,v2) |
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print fcmp(range(7), x) # 0; fringes are equal |
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print fcmp(range(6), x) # -1; 1st list ends early |
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print fcmp(x, range(6)) # 1; 2nd list ends early |
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print fcmp(range(8), x) # 1; 2nd list ends early |
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print fcmp(x, range(8)) # -1; 1st list ends early |
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print fcmp([1,[[2],8]], |
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[[[1],2],8]) # 0 |
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print fcmp([1,[[3],8]], |
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[[[1],2],8]) # 1 |
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print fcmp([1,[[2],8]], |
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[[[1],2],9]) # -1 |
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# end of example |
