# Copyright 2019 Ram Rachum and collaborators.
# This program is distributed under the MIT license.

import abc
import sys

from .pycompat import ABC

def _check_methods(C, *methods):
    mro = C.__mro__
    for method in methods:
        for B in mro:
            if method in B.__dict__:
                if B.__dict__[method] is None:
                    return NotImplemented
                break
        else:
            return NotImplemented
    return True


class WritableStream(ABC):
    @abc.abstractmethod
    def write(self, s):
        pass

    @classmethod
    def __subclasshook__(cls, C):
        if cls is WritableStream:
            return _check_methods(C, 'write')
        return NotImplemented


file_reading_errors = (
    IOError,
    OSError,
    ValueError # IronPython weirdness.
)


def shitcode(s):
    return ''.join(
        (c if (0 < ord(c) < 256) else '?') for c in s
    )