The convention that I've seen among the Clojure community is to represent
these kinds of things as data structures, and define your contraints using
something like https://github.com/plumatic/schema
On Friday, April 29, 2016 at 1:10:29 PM UTC-5, Olek wrote:
>
> Hi!
>
> Clojure data structures can express tree data structures, same as in XML
> what is ideal for DSL. Especially that thanks to macros you can also change
> the evaluation order and hide execution complexity and treat DSL in terms
> of declarations and not statements nor functions. What is more the grammar
> of such structure is simplified to what you can see in XML.
> For example let take the XML example:
>
> <books>
> <book iban="31232" title="some title" author="some author"/>
> <book iban="43232" title="another title 2" author="another author 2"/>
> </books>
>
> Now lets look at Clojure:
>
> (books
> (book { :iban "31232" :title "some title" :author "some author" })
> (book { :ban "43232" :title "another title2" :author "another author 2"
> }) )
>
> You can notice that when you build macros & functions for that you have
> simple structure of input arguments like:
>
> (defmacro/defn books[ attrs & books-col ]
> (do some stuff))
>
> (defn book[ attrs ]
> (do some stuff))
>
> Now all you need is to slurp the specification made in terms of created
> DSL, call eval on it and as the result of execution you will spit the
> resulting data/mutate the state/do side effect.
> Finally for XML you can create XSD to constraint possibilities of tags
> which can be put into DSL.
> But as you can see, such possibility is missing for Clojure. Do you have
> any ready tool for that or do I have to create one?
>
> Thanks in advance,
> Olek
>
>
>
>
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