CTFE & code generators based on PEG grammars?

[Seb]

On Saturday, 6 April 2019 at 12:06:22 UTC, Robert M. Münch wrote:
> I like the idea of DSL which are transpiled into the target 
> language that gets compiled or are interpreted at run-time. 
> Since D is compiled, I would like to transpile the DSL to D at 
> compile-time.
>
> The idea is, that I can write a string (or maybe even a scope 
> block?) in my DSL and use a CTFE grammer to transpile the code.
>
> Does anybody has any experience with such an approach? Are the 
> CTFE facilities overall sufficient to implement something like 
> this? Or is there a much better approach?

One of the most famous examples here is Vibe.d's Diet template:

https://github.com/rejectedsoftware/diet-ng

tl;dr: CTFE is sufficient, but the downside is that it will be 
run everytime you build your program which can increase the build 
time.