[GiovanniP]

Here as far as I understand the fact that TeX is a Turing-complete language makes it impossible to write a converter for TeX. I read a post by Joris van der Hoeven where he said that TeX held back every other program by making it impossible to write converters. I did not find that post so I link to

https://news.ycombinator.com/item?id=27604311

where he talks about the same issue.

[dragonwriter]

> Here as far as I understand the fact that TeX is a Turing-complete language makes it impossible to write a converter for TeX.

Converters whose source, target, or both are Turing complete languages are... not uncommon in computing.