Get pep8 reporter state from stack.

def get_reporter_state():
    """Get pep8 reporter state from stack."""
    # Stack
    # 1. get_reporter_state (i.e. this function)
    # 2. putty_ignore_code
    # 3. QueueReport.error or pep8.StandardReport.error for flake8 -j 1
    # 4. pep8.Checker.check_ast or check_physical or check_logical
    #    locals contains `tree` (ast) for check_ast
    frame = sys._getframe(3)
    reporter = frame.f_locals['self']
    line_number = frame.f_locals['line_number']
    offset = frame.f_locals['offset']
    text = frame.f_locals['text']
    check = frame.f_locals['check']
    return reporter, line_number, offset, text, check