Where can I find information on writing word processors?

Question

IT education

We all know what Microsoft Office is and its analogues like Apple iWork, WPS Office, LibreOffice and so on and so forth. Someone may even have caught Evgeny Nikolayevich Veselov's "Lexicon", the essence of my question is that I want to do something, they say, of my own. But knowledge leaves much to be desired. If someone knows or can tell I will be very glad for your help.
PS I also want to know if it is possible to write similar analogues in python?

Answer 1

https://habr.com/ru/company/jugru/blog/424763/