# -*- coding: UTF-8 -*-
"""Gray Codec - gray code content encoding.

This codec:
- en/decodes strings from str to str
- en/decodes strings from bytes to bytes
- decodes file content to str (read)
- encodes file content from str to bytes (write)
"""
from ..__common__ import *


__examples__ = {
    'enc(gray|reflected-bin|reflected_binary)': {
        'this is a test': "N\\]J0]J0Q0NWJN",
        'THIS IS A TEST': "~lmz0mz0a0~gz~",
   },
}


ENCMAP = {chr(i): chr(i ^ (i >> 1)) for i in range(256)}


add_map("gray", ENCMAP, pattern=r"^(?:gray|reflected[-_]bin(?:ary)?)$", entropy=lambda e: e)