如何清晰地将()映射到嵌套数组上

def map_parentheses(s):
    result = []
    stack = []
    for c in s:
        if c == '(':
            stack.append([])
        elif c == ')':
            if stack:
                nested_array = stack.pop()
                if stack:
                    stack[-1].append(nested_array)
                else:
                    result.append(nested_array)
        else:
            if stack:
                stack[-1].append(c)
            else:
                result.append(c)
    return result