from ...core.operator import is_operator
from functools import partial
from ...core.str2 import (
    concurent_broadcast,
    lookforNumbers,
    pparser,
    missing_times,
    lookfor,
)
from ...core.coroutine import STOOOP
from ...core.MO import moify_cor
from .leaf import look_for_rdleaf


def rdstr2(sink):
    """Return a pipeline which parse random expression and with sink as endpoint

    :example:
    >>> from ...core.str2 import list_sink
    >>> rdstr2list = rdstr2(list_sink)
    >>> rdstr2list("{a}+{a*b}-2")
    [<RdLeaf a>, '+', <RdLeaf a*b>, '+', <MOnumber -2>]
    >>> rdstr2list("{a}({b}x+{c})")
    [<RdLeaf a>, '*', [<RdLeaf b>, '*', <MOstr x>, '+', <RdLeaf c>]]
    """
    lfop = lookfor(is_operator)
    operator_corout = partial(concurent_broadcast, lookfors=[lfop])

    def pipeline(expression):
        str2_corout = look_for_rdleaf(
            lookforNumbers(operator_corout(missing_times(moify_cor(pparser(sink)))))
        )

        for i in expression.replace(" ", ""):
            str2_corout.send(i)
        a = str2_corout.throw(STOOOP)

        return a

    return pipeline