Where in the clojurescript library can I access a function to compile snippets of clojure into js?
I need this to run in the clojure (not clojurescript) repl:
(->js '(fn [x y] (+ x y)))
=> "function(x,y){return x+y}"
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2 Answers
Snippet compilation from Clojure REPL
(require '[cljs.analyzer.api :refer [analyze empty-env]])
(require '[cljs.compiler.api :refer [emit]])
(let [ast (analyze (empty-env) '(defn plus [a b] (+ a b)))]
(emit ast))
;; result
"cljs.user.plus = (function cljs$user$plus(a,b){\nreturn (a + b);\n});\n"
Snippet compilation from ClojureScript REPL:
(require '[cljs.js :refer [empty-state compile-str]])
(compile-str (empty-state) "(defn add [x y] (+ x y))" #(println (:value %)))
;; Output (manually formatted for easier reading)
cljs.user.add = (function cljs$user$add(x,y){
return (x + y);
});
compile-str takes a callback as the last argument. It will be called with a map either with a key :value containing result JS as a string or :error with the compilation error.
In both cases org.clojure/tools.reader is needed on your classpath.
6 Comments
zcaudate
oh awesome! thanks so much. I saw that function but didn't know about empty state. how would you define a specific namespace (instead of
cljs$user)zcaudate
oh hang on... my bad... I'm after the same function but for the clojure repl. slightly edited the question
Piotrek Bzdyl
@zcaudate I have updated the answer with compilation from Clojure REPL
zcaudate
why is it that
(analyze env '(fn [a b] (+ a b))) returns ""?Piotrek Bzdyl
I guess the comment from the code explains it clearly :): "fn statements get erased, serve no purpose and can pollute scope if named". When they are not inside a statement they are a no-op and can be ignored.
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there is a lightweight alternative: https://github.com/kriyative/clojurejs which creates the right output asked by the question.
Examples can be seen here: https://github.com/kriyative/clojurejs/wiki/Examples
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