import re
import string

def generate_letter_code():
    # All lower case
    letters = string.ascii_lowercase
    
    i = 1
    while True:
        # All the combination of lenght of i using letters
        for combination in product(letters, repeat=i):
            yield ''.join(combination)
        i += 1

def get_lstrip(astr):
    return astr[:len(astr) - len(astr.lstrip())]

def get_split(line_string):
    # 定义正则表达式
    pattern = r"([-]{2,}>)"
    # 使用 re.findall 提取匹配的部分
    return re.findall(pattern, line_string)

def get_items(line_string):
    return list(map(lambda x: x.strip(), re.split(r"[-]{2,}>", line)))