Support 歴史的仮名遣い

[jet082]

As it says on the title, it would be nice to be able to automatically change ゑ to え, even を to お (as in をとこ). As well as be able to automatically transform けふ to きょう, くわ to か, げう to ぎょう etc.

I'm sure you know this very well, but there is also a convenient list here if it is helpful: https://www.bunka.go.jp/kokugo_nihongo/sisaku/joho/joho/kijun/naikaku/gendaikana/index.html

[ikegami-yukino]

@jet082
Implementing 歴史的仮名遣い conversion is difficult.
Because the Japanese Language is an agglutinative language it is no word delimiter.
For example, if parts of speech are not considered, "こどもをとこやにいかせた" is converted to "こどもおとこやにいかせた".
Therefore, Supporting 歴史的仮名遣い requires some external module such as POS Tagger.
However, the jaconv has a policy of implementing string conversion processes without using external modules.
If I were to implement a 歴史的仮名遣い conversion, I would implement it in another module rather than in jaconv.