checker: Adapt to changes in lib

import lib.reg as reg

import lib.cfl as cfl

from lib.parsing import Parser, ParsingError

from lib import parser

from lib.parser import ParsingError

from lib.checker import get_task, dfa_transform, nfa_transform, check_task, check_empty, check_alphabets, exit_correct, exit_incorrect

import sys

import signal

def cfg_task(teacher_type: str, teacher_string: str, task: str,

             student_string: str) -> None:

    parser = Parser()

    assert task[:3] == "CFG", f"Invalid task prefix {task[:3]}"

    if len(task) > 3:

        assert task[3] == '+', f"Invalid task suffix {task[3:]}"

    constraints = filter(lambda x: len(x) != 0, task[4:].split(","))

    try:

        teacher_solution = parser.str_to_cfg(teacher_string)

        teacher_solution = parser.cfg(teacher_string)

    except ParsingError as message:

        print(paragraph(f"Error parsing teacher's solution: {message}"))

        exit(1)

    try:

        student_solution = parser.str_to_cfg(student_string)

        student_solution = parser.cfg(student_string)

    except ParsingError as message:

        print(paragraph(f"Error parsing student's solution: {message}"))

        exit(1)