python brackets / parenthesis split join to list

brackets.py

def split_brackets(text, brackets_open_character='(', brackets_close_character=')', depth=0):
    items = []

    word = ''
    counter = 0
    start = -1

    for index, character in enumerate(text):
        if character == brackets_open_character:
            if counter == 0:

                if word:
                    items.append(word)
                    word = ''

                start = index + 1

            counter += 1

        elif character == brackets_close_character:
            counter -= 1

            if counter == 0:
                items.append(split_brackets(text[start:index], brackets_open_character=brackets_open_character, brackets_close_character=brackets_close_character, depth=depth + 1))

        else:
            if counter == 0:
                word += character

    if word:
        items.append(word)

    return items


def join_brackets(items, brackets_open_character='(', brackets_close_character=')', depth=0):
    parts = []
    for item in items:

        if isinstance(item, list):
            item = join_brackets(item, brackets_open_character=brackets_open_character, brackets_close_character=brackets_close_character, depth=depth + 1)
            item = '{brackets_open_character}{item}{brackets_close_character}'.format(item=item, brackets_close_character=brackets_close_character, brackets_open_character=brackets_open_character)

        parts.append(item)

    return ''.join(parts)


def main():
    text = '(1) and (b and (asd )) and (c)'
    splitted = split_brackets(text)
    assert (join_brackets(splitted) == text)


if __name__ == '__main__':
    main()