[datadeft]

> You have complex enough logic to warrant a language, you should use a real language.

Not sure what you mean. Dhall is a real language:

    Dhall is not a Turing-complete programming language, 
    which is why Dhall’s type system can provide safety 
    guarantees on par with non-programmable configuration 
    file formats. Specifically, Dhall is a “total” 
    functional programming language, which means that:

    You can always type-check an expression in a finite 
    amount of time

    If an expression type-checks then evaluating that 
    expression always succeeds in a finite amount of time