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from typing import Optional
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from typing import Text
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def right_mark_index(pinyin_no_tone: Text) -> Optional[int]:
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"""
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标调位置
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有 ɑ 不放过，
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没 ɑ 找 o、e；
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ɑ、o、e、i、u、ü
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标调就按这顺序；
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i、u 若是连在一起，
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谁在后面就标谁。
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有ɑ不放过（有ɑ一定要标在ɑ上）；
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无ɑ找oe（没有ɑ的时候标在o上,如果没有o则标在e上）;
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iu并列标在后（iu, ui的情况,标在后面的字母上,比如说iu应该标u,ui应该标i）；
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单个韵母不用说（只能标在单韵母上）
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http://www.hwjyw.com/resource/content/2010/06/04/8183.shtml
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https://www.zhihu.com/question/23655297
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https://github.com/mozillazg/python-pinyin/issues/160
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http://www.pinyin.info/rules/where.html
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"""
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# 有 ɑ 不放过, 没 ɑ 找 o、e
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for c in ['a', 'o', 'e']:
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if c in pinyin_no_tone:
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return pinyin_no_tone.index(c)
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# i、u 若是连在一起，谁在后面就标谁
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for c in ['iu', 'ui']:
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if c in pinyin_no_tone:
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return pinyin_no_tone.index(c) + 1
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# ɑ、o、e、i、u、ü
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for c in ['i', 'u', 'v', 'ü']:
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if c in pinyin_no_tone:
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return pinyin_no_tone.index(c)
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# n, m, ê
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for c in ['n', 'm', 'ê']:
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if c in pinyin_no_tone:
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return pinyin_no_tone.index(c)
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