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# encoding: utf8

import pytest

import aspectlib

from test_aspectlib_py3 import consume

def test_aspect_on_generator_result():

result = []

@aspectlib.Aspect

def aspect():

result.append((yield aspectlib.Proceed))

@aspect

def func():

yield 'something'

return 'value'

assert list(func()) == ['something']

assert result == ['value']

def test_aspect_on_coroutine():

hist = []

@aspectlib.Aspect

def aspect():

try:

hist.append('before')

hist.append((yield aspectlib.Proceed))

hist.append('after')

except Exception:

hist.append('error')

finally:

hist.append('finally')

try:

hist.append((yield aspectlib.Return))

except GeneratorExit:

hist.append('closed')

raise

else:

hist.append('consumed')

hist.append('bad-suffix')

@aspect

def func():

val = 99

for _ in range(3):

print("YIELD", val + 1)

val = yield val + 1

print("GOT", val)

return "the-return-value"

gen = func()

data = []

try:

for i in [None, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]:

data.append(gen.send(i))

except StopIteration:

data.append('done')

print(data)

assert data == [100, 1, 2, 'done'], hist

print(hist)

assert hist == ['before', 'the-return-value', 'after', 'finally', 'closed']

def test_aspect_chain_on_generator():

@aspectlib.Aspect

def foo(arg):

result = yield aspectlib.Proceed(arg + 1)

yield aspectlib.Return(result - 1)

@foo

@foo

@foo

def func(a):

assert a == 3

return a

yield

gen = func(0)

result = pytest.raises(StopIteration, gen.__next__ if hasattr(gen, '__next__') else gen.next)

assert result.value.args == (0,)

def test_aspect_chain_on_generator_no_return_advice():

@aspectlib.Aspect

def foo(arg):

yield aspectlib.Proceed(arg + 1)

@foo

@foo

@foo

def func(a):

assert a == 3

return a

yield

gen = func(0)

assert consume(gen) == 3

def test_aspect_on_generator_raise_stopiteration():

result = []

@aspectlib.Aspect

def aspect():

val = yield aspectlib.Proceed

result.append(val)

@aspect

def func():

return 'something'

yield

assert list(func()) == []

assert result == ['something']

def test_aspect_on_generator_result_from_aspect():

@aspectlib.Aspect

def aspect():

yield aspectlib.Proceed

yield aspectlib.Return('result')

@aspect

def func():

yield 'something'

gen = func()

try:

while 1:

next(gen)

except StopIteration as exc:

assert exc.args == ('result',)

else:

raise AssertionError("did not raise StopIteration")

def test_aspect_chain_on_generator_no_return():

@aspectlib.Aspect

def foo(arg):

result = yield aspectlib.Proceed(arg + 1)

yield aspectlib.Return(result)

@foo

@foo

@foo

def func(a):

assert a == 3

yield

gen = func(0)

assert consume(gen) is None