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(ns tojs
(:import (clojure.lang Compiler Compiler$C))
(:require [clojure.contrib.duck-streams :as ds]))
(defn vstr [v]
(let [sb (StringBuilder.)
lvl (fn lvl [v]
(doseq i v
(if (vector? i)
(lvl i)
(.append sb (str i)))))]
(lvl v)
(str sb)))
(defmulti tojs (fn [e ctx] (class e)))
(defmethod tojs clojure.lang.Var [e ctx]
(-> e str (.substring 2) (.replace "/" ".")))
(defmethod tojs clojure.lang.Compiler$DefExpr [e ctx]
(str (tojs (.var e) ctx) "=" (tojs (.init e) ctx) ";\n"))
(defn fnmethod [fm ctx]
(let [lm (into {} (map (fn [[lb lb] i] [lb (str (.name lb) "_" i)])
(.locals fm) (iterate inc 0)))]
(vstr
[
"var " (vec (interpose "," (vals lm))) ";\n"
(vec (for [lb (.reqParms fm)]
[(lm lb) "=arguments[" (dec (.idx lb)) "];\n"]))
(when-let lb (.restParm fm)
["var " (lm lb) "=clojure.lang.ArraySeq.create(arguments).drop("
(count (.reqParms fm)) ");\n"])
"return (" (tojs (.body fm) (assoc ctx :localmap lm)) ")"])))
(defmethod tojs clojure.lang.Compiler$FnExpr [e ctx]
(vstr ["function " (.thisName e) "(){\n"
(vec (for [fm (.methods e) :when (not= fm (.variadicMethod e))]
["if(arguments.length=" (count (.argLocals fm)) "){\n"
(fnmethod fm ctx)
"}\n"]))
(if (.variadicMethod e)
[(fnmethod (.variadicMethod e) ctx) "\n"]
["throw \"Wrong number of args passed to: " (.thisName e) "\";\n"])
"}"]))
(defmethod tojs clojure.lang.Compiler$BodyExpr [e ctx]
(apply str (interpose ",\n" (map #(tojs % ctx) (.exprs e)))))
(defmethod tojs clojure.lang.Compiler$LetExpr [e ctx]
(vstr ["("
(vec (for [bi (.bindingInits e)]
["(" ((:localmap ctx) (.binding bi))
"=" (tojs (.init bi) ctx) "),\n"]))
(tojs (.body e) ctx)
")"]))
;(defmethod tojs clojure.lang.Compiler$LetExpr [e ctx]
; (let [names (map #(.name (.binding %)) (.bindingInits e))
; inits (map #(.init %) (.bindingInits e))]
; (vstr ["(function("
; (vec (interpose ",\n" names))
; "){\n" (tojs (.body e) ctx) "})(\n "
; (vec (interpose ",\n " (map tojs inits)))
; ");\n"])))
(defmethod tojs clojure.lang.Compiler$VectorExpr [e ctx]
(vstr ["clojure.lang.PersistentVector.create(["
(vec (interpose "," (map #(tojs % ctx) (.args e))))
"])"]))
(defmethod tojs clojure.lang.Compiler$ConstantExpr [e ctx]
(if (symbol? (.v e))
(str \" (.v e) \")
(str (.v e))))
(defmethod tojs clojure.lang.Compiler$InvokeExpr [e ctx]
(vstr [(tojs (.fexpr e) ctx)
"("
(vec (interpose "," (map #(tojs % ctx) (.args e))))
")"]))
(defmethod tojs clojure.lang.Compiler$LocalBindingExpr [e ctx]
((:localmap ctx) (.b e)))
(defmethod tojs clojure.lang.Compiler$NilExpr [e ctx]
"null")
(defmethod tojs clojure.lang.Compiler$StringExpr [e ctx]
(str \" (.str e) \"))
(defmethod tojs clojure.lang.Compiler$VarExpr [e ctx]
(tojs (.var e) ctx))
(defmethod tojs clojure.lang.Compiler$StaticFieldExpr [e ctx]
(str (.getCanonicalName (.c e)) "." (.fieldName e)))
(defmethod tojs clojure.lang.Compiler$StaticMethodExpr [e ctx]
(vstr [(.getCanonicalName (.c e)) "." (.methodName e) "("
(vec (interpose "," (map #(tojs % ctx) (.args e))))
")"]))
(defmethod tojs clojure.lang.Compiler$IfExpr [e ctx]
(str "(" (tojs (.testExpr e) ctx)
"?" (tojs (.thenExpr e) ctx)
":" (tojs (.elseExpr e) ctx) ")"))
(defn formtojs [f]
(tojs (Compiler/analyze Compiler$C/STATEMENT f) {}))
(defn testboot []
(let [boot "/home/chouser/build/clojure/src/clj/clojure/boot.clj"
bootreader (java.io.PushbackReader. (ds/reader boot))
tmpns (create-ns 'tmp)]
(loop []
(when-let f (read bootreader)
(println "======")
(prn f)
(println "---")
(binding [*ns* tmpns]
(println (formtojs f))
(eval f))
(recur)))))
(println (formtojs
'(defn foo
([a b c & d] (prn 3 a b c))
([c];
;(String/asd "hello")
;(.foo 55)
(let [[a b] [1 2]]
(prn a b c)
"hi")))))
(println (formtojs
'(defn foo [a]
(prn "hi")
(let [a 5]
(let [a 10]
(prn "yo")
(prn a))
(prn a))
(prn a))))
(testboot)
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