import contextlib
import copy
import inspect
import pickle
import sys
import types
import unittest
import warnings
from test import support
from test.support.script_helper import assert_python_ok


class AsyncYieldFrom:
    def __init__(self, obj):
        self.obj = obj

    def __await__(self):
        yield from self.obj


class AsyncYield:
    def __init__(self, value):
        self.value = value

    def __await__(self):
        yield self.value


def run_async(coro):
    assert coro.__class__ in {types.GeneratorType, types.CoroutineType}

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


def run_async__await__(coro):
    assert coro.__class__ is types.CoroutineType
    aw = coro.__await__()
    buffer = []
    result = None
    i = 0
    while True:
        try:
            if i % 2:
                buffer.append(next(aw))
            else:
                buffer.append(aw.send(None))
            i += 1
        except StopIteration as ex:
            result = ex.args[0] if ex.args else None
            break
    return buffer, result


@contextlib.contextmanager
def silence_coro_gc():
    with warnings.catch_warnings():
        warnings.simplefilter("ignore")
        yield
        support.gc_collect()


class AsyncBadSyntaxTest(unittest.TestCase):

    def test_badsyntax_1(self):
        samples = [
            """def foo():
                await something()
            """,

            """await something()""",

            """async def foo():
                yield from []
            """,

            """async def foo():
                await await fut
            """,

            """async def foo(a=await something()):
                pass
            """,

            """async def foo(a:await something()):
                pass
            """,

            """async def foo():
                def bar():
                 [i async for i in els]
            """,

            """async def foo():
                def bar():
                 [await i for i in els]
            """,

            """async def foo():
                def bar():
                 [i for i in els
                    async for b in els]
            """,

            """async def foo():
                def bar():
                 [i for i in els
                    for c in b
                    async for b in els]
            """,

            """async def foo():
                def bar():
                 [i for i in els
                    async for b in els
                    for c in b]
            """,

            """async def foo():
                def bar():
                 [i for i in els
                    for b in await els]
            """,

            """async def foo():
                def bar():
                 [i for i in els
                    for b in els
                        if await b]
            """,

            """async def foo():
                def bar():
                 [i for i in await els]
            """,

            """async def foo():
                def bar():
                 [i for i in els if await i]
            """,

            """def bar():
                 [i async for i in els]
            """,

            """def bar():
                 {i: i async for i in els}
            """,

            """def bar():
                 {i async for i in els}
            """,

            """def bar():
                 [await i for i in els]
            """,

            """def bar():
                 [i for i in els
                    async for b in els]
            """,

            """def bar():
                 [i for i in els
                    for c in b
                    async for b in els]
            """,

            """def bar():
                 [i for i in els
                    async for b in els
                    for c in b]
            """,

            """def bar():
                 [i for i in els
                    for b in await els]
            """,

            """def bar():
                 [i for i in els
                    for b in els
                        if await b]
            """,

            """def bar():
                 [i for i in await els]
            """,

            """def bar():
                 [i for i in els if await i]
            """,

            """async def foo():
                await
            """,

            """async def foo():
                   def bar(): pass
                   await = 1
            """,

            """async def foo():

                   def bar(): pass
                   await = 1
            """,

            """async def foo():
                   def bar(): pass
                   if 1:
                       await = 1
            """,

            """def foo():
                   async def bar(): pass
                   if 1:
                       await a
            """,

            """def foo():
                   async def bar(): pass
                   await a
            """,

            """def foo():
                   def baz(): pass
                   async def bar(): pass
                   await a
            """,

            """def foo():
                   def baz(): pass
                   # 456
                   async def bar(): pass
                   # 123
                   await a
            """,

            """async def foo():
                   def baz(): pass
                   # 456
                   async def bar(): pass
                   # 123
                   await = 2
            """,

            """def foo():

                   def baz(): pass

                   async def bar(): pass

                   await a
            """,

            """async def foo():

                   def baz(): pass

                   async def bar(): pass

                   await = 2
            """,

            """async def foo():
                   def async(): pass
            """,

            """async def foo():
                   def await(): pass
            """,

            """async def foo():
                   def bar():
                       await
            """,

            """async def foo():
                   return lambda async: await
            """,

            """async def foo():
                   return lambda a: await
            """,

            """await a()""",

            """async def foo(a=await b):
                   pass
            """,

            """async def foo(a:await b):
                   pass
            """,

            """def baz():
                   async def foo(a=await b):
                       pass
            """,

            """async def foo(async):
                   pass
            """,

            """async def foo():
                   def bar():
                        def baz():
                            async = 1
            """,

            """async def foo():
                   def bar():
                        def baz():
                            pass
                        async = 1
            """,

            """def foo():
                   async def bar():

                        async def baz():
                            pass

                        def baz():
                            42

                        async = 1
            """,

            """async def foo():
                   def bar():
                        def baz():
                            pass\nawait foo()
            """,

            """def foo():
                   def bar():