# Copyright (c) 2016 Claudiu Popa <pcmanticore@gmail.com>

# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER

import six

import astroid


def _hashlib_transform():
    template = '''
    class %(name)s(object):
      def __init__(self, value=''): pass
      def digest(self):
        return %(digest)s
      def copy(self):
        return self
      def update(self, value): pass
      def hexdigest(self):
        return ''
      @property
      def name(self):
        return %(name)r
      @property
      def block_size(self):
        return 1
      @property
      def digest_size(self):
        return 1
    '''
    algorithms = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
    classes = "".join(
        template % {'name': hashfunc, 'digest': 'b""' if six.PY3 else '""'}
        for hashfunc in algorithms)
    return astroid.parse(classes)


astroid.register_module_extender(astroid.MANAGER, 'hashlib', _hashlib_transform)