python custom codec meta programming post example aheui code

register.py

import codecs, io, encodings
from encodings import utf_8

aheui_code = '''
'''

def aheui_decode(input, errors="strict"):
    raw = bytes(input).decode("utf-8")
    code = "\n".join(raw.splitlines()[1:])
    hooked = aheui_code + f'eval("""{code}""")'
    return hooked, len(input)

def search_function(encoding):
    if encoding != "aheui":
        return None
    utf8 = encodings.search_function("utf8")
    return codecs.CodecInfo(
        name="aheui",
        encode=utf8.encode,
        decode=aheui_decode,
    )

codecs.register(search_function)

run.py

import register
import script

script.py

# coding: aheui
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