How to best implement a DSL?

[Robert M. Münch]

On 2018-07-28 15:43:12 +0000, rikki cattermole said:

>>     * Could I somehow call an external program during compilation which 
>> gets the DSL block as input and returns D code?
> 
> No. But you can pre-process.

Yes, sure, but this complicates the build-system. I preferr to use as 
few parts as possible.


>>     * Is it possible to populate such a dictonary via CTFE?
> 
> Sort of, it can be registered, but the actual execution of the 
> registration occurs at runtime.

Yes, no problem. How is this done?

> But you're slightly over thinking this. Write an interpreter and a 
> parser. The fact that the parser can work at CTFE is irrelevant and 
> almost a footnote on the page of details ;).

Not really if you think about deployment. I want to create a single 
executable, no external files. So I somehow have to get the scripts 
included or use the compiler as generator. The main use-case is, that I 
want to use a very declarative approach for some UI parts.

> If you want to be clever you could generate D code and mix it in based 
> upon what was parsed. But you'd still want that dictionary.

Yes, mixing in generate D code was the idea. However, I think a good 
included infrastructure that support creating DSLs might help a lot to 
simplify this.


-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
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