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from .mtrand import RandomState
from ._philox import Philox
from ._pcg64 import PCG64, PCG64DXSM
from ._sfc64 import SFC64

from ._generator import Generator
from ._mt19937 import MT19937

BitGenerators = {'MT19937': MT19937,
                 'PCG64': PCG64,
                 'PCG64DXSM': PCG64DXSM,
                 'Philox': Philox,
                 'SFC64': SFC64,
                 }


def __bit_generator_ctor(bit_generator_name='MT19937'):
    """
    Pickling helper function that returns a bit generator object

    Parameters
    ----------
    bit_generator_name : str
        String containing the name of the BitGenerator

    Returns
    -------
    bit_generator : BitGenerator
        BitGenerator instance
    """
    if bit_generator_name in BitGenerators:
        bit_generator = BitGenerators[bit_generator_name]
    else:
        raise ValueError(str(bit_generator_name) + ' is not a known '
                                                   'BitGenerator module.')

    return bit_generator()


def __generator_ctor(bit_generator_name="MT19937",
                     bit_generator_ctor=__bit_generator_ctor):
    """
    Pickling helper function that returns a Generator object

    Parameters
    ----------
    bit_generator_name : str
        String containing the core BitGenerator's name
    bit_generator_ctor : callable, optional
        Callable function that takes bit_generator_name as its only argument
        and returns an instantized bit generator.

    Returns
    -------
    rg : Generator
        Generator using the named core BitGenerator
    """
    return Generator(bit_generator_ctor(bit_generator_name))


def __randomstate_ctor(bit_generator_name="MT19937",
                       bit_generator_ctor=__bit_generator_ctor):
    """
    Pickling helper function that returns a legacy RandomState-like object

    Parameters
    ----------
    bit_generator_name : str
        String containing the core BitGenerator's name
    bit_generator_ctor : callable, optional
        Callable function that takes bit_generator_name as its only argument
        and returns an instantized bit generator.

    Returns
    -------
    rs : RandomState
        Legacy RandomState using the named core BitGenerator
    """

    return RandomState(bit_generator_ctor(bit_generator_name))