"""
ascii6 codec

Compression idea:
Use only lower-case letters and spaces.
Everything else is removed.

Compression rate:
Better than ascii7 because fewer characters are stored.

Quality loss:
Uppercase letters, punctuation, and special characters are removed.
"""

from custom_codecs.register import register_codec


def encode(text):
    cleaned = []

    for c in text.lower():
        if c.isalpha() or c == " ":
            cleaned.append(c)

    return "".join(cleaned).encode("ascii")


def decode(data):
    return data.decode("ascii")


register_codec("ascii6", encode, decode)