Add reverse transliteration ability

[adnikiforov]

There is one transliteration schema with ability to reverse transliteration: ISO 9:1995 (https://dangry.ru/iuliia/#unambiguous)

That's the plan:

• Add ability to mark certain schemas as 'reversible' (probably yaml config, schemas maintainer does not provide such info)
• Add ability to reverse transliteration (basically pass Cyrillic string to .translit and get Latin string back)
• Add specs for this implementation

[theendcomplete]

hi
What do you think about adding .untranslit method?

In this method it would be possible to filter only supported reversed schemas.

this method could use only reversable schemas and with this method i would be musch easier to implement transliteration/untransliteration with external schemas in future (I think this would be great improvement).

something like this:
iuliia -t 'какой-то текст' --schema /path/to/schema.json

iuliia -u 'kakoy-to tekst' --schema /path/to/reversed_schema.json

[adnikiforov]

.untranslit seems interesting. So will it throw an exception if no reversible schema used to reverse?

About external schemas, I'm not sure that will be that much of a needed feature, cause nalgeon maintain available schemas, and we just use schemas he provide. Sure we can add such feature, I'll think over it. In that issue let's target only reverse translit using existing schemas.

[theendcomplete]

.untranslit seems interesting. So will it throw an exception if no reversible schema used to reverse?

Raising the exception when user specified incorrect schema is sure a good thing.

And someday it could become warning. We can try to untranslit non-reversable schemas with no guarantees warning.

But for current issue roadmap is:

• Add ability to mark certain schemas as 'reversible' (probably yaml config, schemas maintainer does not provide such info)

• Add ability to reverse transliteration (basically pass Cyrillic (with check that it is Cyrillic) string to .untranslit and get Latin string back)

• Add specs for this implementation

[adnikiforov]

Also, it might be nice to add reversible_schemas method to return only reversible schemas.

Anyway, roadmap is fine.