Paint.NET Palette File Parser

paint_net_palette_parser.py

from typing import TextIO  # For type hinting for the file object in parse_palette


def parse_palette(file: TextIO) -> list:
    """
    Parses Paint.NET palette files into a python list that contains the strings of the hex color values:

    parses the colors,
    pads hex colors that their length is smaller than 8 with the needed amount of 0's,
    if line contains non hex characters or it has more than 8 characters it skips them (also skips ; comments),
    and it adds "FFFFFFFF" to the list until it has 96 colors if needed
    and it skips the rest of the lines if it has 96 colors.
    
    :param file TextIO: The person sending the message
    :return: the parsed palette list
    :rtype: list    
    """
    
    # Hex characters for checking if the line is a hex color value
    hex_chars = set("0123456789abcdefABCDEF")

    # Where the colors will be stored
    palette_list = []

    for line in file:

        stripped_line = line.strip()
        # Paint.NET palette file allows only 96 colors max
        if len(palette_list) >= 96:
            break

        # Check if contains non hex character and also skips ; comments and continues if the hex value is bigger than 8
        elif (
            not all(char in "0123456789abcdefABCDEF" for char in stripped_line)
            or stripped_line == ""
            or len(stripped_line) > 8
        ):
            continue

        else:
            # Add 0 padding to the hex values if needed and append to the list
            palette_list.append(stripped_line.zfill(8))

    # Append white to the list until it reaches 96 colors if it has less than 96 colors
    while len(palette_list) < 96:
        palette_list.append("FFFFFFFF")

    # Return the completed list
    return palette_list


if __name__ == "__main__":
    # Opens your palette file and prints the list
    with open("palette_file.txt", "r") as file:
        print(parse_palette(file))