# cython: language_level=3str, binding=True
# mode: run
# tag: pep492, await, gh3337

"""
Cython specific tests in addition to "test_coroutines_pep492.pyx"
(which is copied from CPython).
"""

import sys


def run_async(coro):
    #assert coro.__class__ is types.GeneratorType
    assert coro.__class__.__name__ in ('coroutine', '_GeneratorWrapper'), coro.__class__.__name__

    buffer = []
    result = None
    while True:
        try:
            buffer.append(coro.send(None))
        except StopIteration as ex:
            result = ex.value if sys.version_info >= (3, 5) else ex.args[0] if ex.args else None
            break
    return buffer, result


async def test_async_temp_gh3337(x, y):
    """
    >>> run_async(test_async_temp_gh3337(2, 3))
    ([], -1)
    >>> run_async(test_async_temp_gh3337(3, 2))
    ([], 0)
    """
    return min(x - y, 0)


async def outer_with_nested(called):
    """
    >>> called = []
    >>> _, inner = run_async(outer_with_nested(called))
    >>> called  # after outer_with_nested()
    ['outer', 'make inner', 'deco', 'return inner']
    >>> _ = run_async(inner())
    >>> called  # after inner()
    ['outer', 'make inner', 'deco', 'return inner', 'inner']
    """
    called.append('outer')

    def deco(f):
        called.append('deco')
        return f

    called.append('make inner')

    @deco
    async def inner():
        called.append('inner')
        return 1

    called.append('return inner')
    return inner