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Some lambdas
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from functools import reduce | |
run = lambda s: reduce(lambda *_:..., iter(lambda s=[s]: | |
(_:=s.pop()(),s.append(_))[0], None)) | |
const = lambda v,c : lambda: c(v) | |
add = lambda x,y,c : lambda: c(x+y) | |
mul = lambda x,y,c : lambda: c(x*y) | |
gt = lambda x,y,c : lambda: c(x>y) | |
display = lambda v,c : lambda: (print(v), c)[1] | |
cbranch = lambda t,c,a : (a,c)[bool(t)] | |
branch = lambda c : c | |
ret = lambda c,r : lambda: c(r) | |
halt = lambda *_ : None | |
_ = lambda *t : lambda: t[0]() | |
fact = lambda n, c: _( | |
init:= _( | |
const (1, lambda r0: | |
const (1, lambda r1: | |
branch (loop(r0, r1)))) | |
), | |
loop:= lambda x, result: _( | |
gt (x, n, lambda r2: | |
cbranch (r2, exit, body)), | |
body:= _( | |
mul (x, result, lambda r3: | |
const (1, lambda r4: | |
add (x, r4, lambda r5: | |
branch (loop(r5, r3))))) | |
), | |
exit:= _( | |
ret (c, result), | |
), | |
) | |
) | |
run(const (5, lambda r1: | |
fact (r1, lambda r2: | |
display (r2, | |
halt)))) | |
print_n_fact = lambda n, c: _( | |
init:= _( | |
const (1, lambda r0: | |
branch (loop(r0))) | |
), | |
loop:= lambda x: _( | |
gt (x, n, lambda r1: | |
cbranch (r1, exit, body)), | |
body := _( | |
fact (x, lambda r2: | |
display (r2, lambda: | |
const (1, lambda r3: | |
add (x, r3, lambda r4: | |
branch (loop(r4)))))) | |
) | |
), | |
exit:= _( | |
ret (c, None) | |
) | |
) | |
run(const (10, lambda r1: | |
print_n_fact (r1, | |
halt))) |
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