# scopes.core.actor

import asyncio

from scopes import util

quit = util.Symbol("quit")

async def loop(q, bhv):
    while True:
        msg = await q.get()
        if msg is quit:
            break
        bhv = await bhv(msg) or bhv

def create(bhv, group=None):
    q = asyncio.Queue()
    if group is None:
        return q, asyncio.create_task(loop(q, bhv))
    else:
        group.create_task(loop(q, bhv))
    return q