With read-string in Clojure, the :clj platform feature is always active but
it is possible to add additional features like :cljs:
(read-string {:read-cond :allow, :features #{:cljs}} "#?(:clj 1 :cljs 2)")
In this case, both :clj and :cljs features will be active, so it will
return 1 because the read-cond checks in order. If you put the :cljs choice
first, it would be taken.
With tools.reader, you will not have this issue - you can use tools.reader
to read with only the :cljs platform feature active.
(require '[clojure.tools.reader :as r])
(r/read-string {:read-cond :allow, :features #{:cljs}} "#?(:clj 1 :cljs
2)") ;; 2
And this is exactly how ClojureScript reads (using tools.reader).
On Thursday, July 19, 2018 at 12:44:57 AM UTC-5, Nikita Beloglazov wrote:
>
> Hi
>
> Is it possible to read a string containing reader conditionals using a
> platform different from "current". In particular in from clojure I want to
> read a string that contains :cljs reader conditionals and evaluate them as
> if current platform is cljs.
>
> Example: if I run the following code from clj:
>
> (read-string {:read-cond :allow} "#?(:clj 1 :cljs 2)")
>
> then I get 1. But I want to get 2. Is there a way to do it in Clojure
> somehow or maybe using tools.reader?
>
> Thanks,
> Nikita
>
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