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from greenlet import greenlet
from . import TestCase
from .leakcheck import fails_leakcheck
class genlet(greenlet):
parent = None
def __init__(self, *args, **kwds):
self.args = args
self.kwds = kwds
self.child = None
def run(self):
# Note the function is packed in a tuple
# to avoid creating a bound method for it.
fn, = self.fn
fn(*self.args, **self.kwds)
def __iter__(self):
return self
def set_child(self, child):
self.child = child
def __next__(self):
if self.child:
child = self.child
while child.child:
tmp = child
child = child.child
tmp.child = None
result = child.switch()
else:
self.parent = greenlet.getcurrent()
result = self.switch()
if self:
return result
raise StopIteration
next = __next__
def Yield(value, level=1):
g = greenlet.getcurrent()
while level != 0:
if not isinstance(g, genlet):
raise RuntimeError('yield outside a genlet')
if level > 1:
g.parent.set_child(g)
g = g.parent
level -= 1
g.switch(value)
def Genlet(func):
class TheGenlet(genlet):
fn = (func,)
return TheGenlet
# ____________________________________________________________
def g1(n, seen):
for i in range(n):
seen.append(i + 1)
yield i
def g2(n, seen):
for i in range(n):
seen.append(i + 1)
Yield(i)
g2 = Genlet(g2)
def nested(i):
Yield(i)
def g3(n, seen):
for i in range(n):
seen.append(i + 1)
nested(i)
g3 = Genlet(g3)
def a(n):
if n == 0:
return
for ii in ax(n - 1):
Yield(ii)
Yield(n)
ax = Genlet(a)
def perms(l):
if len(l) > 1:
for e in l:
# No syntactical sugar for generator expressions
x = [Yield([e] + p) for p in perms([x for x in l if x != e])]
assert x
else:
Yield(l)
perms = Genlet(perms)
def gr1(n):
for ii in range(1, n):
Yield(ii)
Yield(ii * ii, 2)
gr1 = Genlet(gr1)
def gr2(n, seen):
for ii in gr1(n):
seen.append(ii)
gr2 = Genlet(gr2)
class NestedGeneratorTests(TestCase):
def test_layered_genlets(self):
seen = []
for ii in gr2(5, seen):
seen.append(ii)
self.assertEqual(seen, [1, 1, 2, 4, 3, 9, 4, 16])
@fails_leakcheck
def test_permutations(self):
gen_perms = perms(list(range(4)))
permutations = list(gen_perms)
self.assertEqual(len(permutations), 4 * 3 * 2 * 1)
self.assertIn([0, 1, 2, 3], permutations)
self.assertIn([3, 2, 1, 0], permutations)
res = []
for ii in zip(perms(list(range(4))), perms(list(range(3)))):
res.append(ii)
self.assertEqual(
res,
[([0, 1, 2, 3], [0, 1, 2]), ([0, 1, 3, 2], [0, 2, 1]),
([0, 2, 1, 3], [1, 0, 2]), ([0, 2, 3, 1], [1, 2, 0]),
([0, 3, 1, 2], [2, 0, 1]), ([0, 3, 2, 1], [2, 1, 0])])
# XXX Test to make sure we are working as a generator expression
def test_genlet_simple(self):
for g in g1, g2, g3:
seen = []
for _ in range(3):
for j in g(5, seen):
seen.append(j)
self.assertEqual(seen, 3 * [1, 0, 2, 1, 3, 2, 4, 3, 5, 4])
def test_genlet_bad(self):
try:
Yield(10)
except RuntimeError:
pass
def test_nested_genlets(self):
seen = []
for ii in ax(5):
seen.append(ii)
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