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(ns step1-read-print
(:require [clojure.repl]
[readline]
[reader]
[printer]))
;; read
(defn READ [& [strng]]
(let [line (if strng strng (read-line))]
(reader/read-string strng)))
;; eval
(defn EVAL [ast env]
ast)
;; print
(defn PRINT [exp] (pr-str exp))
;; repl
(defn rep
[strng]
(PRINT (EVAL (READ strng) {})))
;; repl loop
(defn repl-loop []
(let [line (readline/readline "user> ")]
(when line
(when-not (re-seq #"^\s*$|^\s*;.*$" line) ; blank/comment
(try
(println (rep line))
(catch Throwable e
(clojure.repl/pst e))))
(recur))))
(defn -main [& args]
(repl-loop))
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