ludus/janet/ludus.janet

# an integrated Ludus interpreter
(try (os/cd "janet") ([_] nil)) # for REPL
(import /scanner :as s)
(import /parser :as p)
(import /validate :as v)
(import /interpreter :as i)
(import /errors :as e)
(import /base :as b)
(import spork/json :as j)

(comment
The API from the old Clojure Ludus interpreter returns an object with four fields:
 * `console`: an array of lines to be printed to the console
 * `result`: a string representation of the result of running the script
 * `draw`: an array of arrays that represent p5 calls, e.g. `["line", 0, 0, 100, 100]`
 * `errors`: an array of errors, which are just strings

This new scene will have to return a JSON POJSO:
{:console [...] :result "..." :draw [...] :errors [...]}
)

(def console @"")
(setdyn :out console)
(print "foo")
(pp {:a 1 :b 2})
(setdyn :out stdout)
(print "collected out")
(print console)

(defn run [source]
 (def errors @[])
 (def draw @[])
 (var result @"")
 (def console @"")
 (def out @{:errors errors :draw draw :result result :console console})
 (def scanned (s/scan source))
 (when (any? (scanned :errors))
  (break (-> :errors scanned (e/scan-error out))))
 (def parsed (p/parse scanned))
 (when (any? (parsed :errors))
  (break (-> :errors parsed (e/parse-error out))))
 (def validated (v/valid parsed))
 (when (any? (validated :errors))
  (break (-> :errors validated (e/validation-error out))))
 (setdyn :out console)
 (try
  (set result (b/show (i/interpret (parsed :ast) @{})))
  ([err] (e/runtime-error err out)))
 (set (out :result) result)
 (j/encode out))

(defn test [source])

(defn run-script [filename]
 (def source (slurp filename))
 (run source))

(def source `
 fn foo () -> :foo
 foo ()
`)

(-> source run j/decode)