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(ns lang.interpreter
(:refer-clojure :exclude [eval resolve -' *'])
(:require [clojure.core.match :refer [match]]
(lang [util :as &util :refer [exec return* return fail fail*
repeat-m try-m try-all-m map-m
apply-m]]
[parser :as &parser]
[lexer :as &lexer]
[compiler :as &compiler])
:reload)
)
(declare eval-form)
;; (defonce _init_
;; (do (alter-var-root #'clojure.core/prn
;; (constantly #(.println System/out (apply pr-str %&))))))
(def <=' (fn [x] (fn [y] (<= x y))))
(def -' (fn [x] (fn [y] (- x y))))
(def +' (fn [x] (fn [y] (+ x y))))
(def *' (fn [x] (fn [y] (* x y))))
;; [Utils]
(def ^:private +state+
{:globals {"*" (fn [x] (fn [y] (* x y)))}
:stack {}
:forms '()})
(defn wrap [x]
(update-in +state+ [:forms] conj x))
(defn wrap-in [state x]
(assoc state :forms (list x)))
(defn resolve [ident]
(fn [state]
;; (prn 'resolve ident (get-in state [:globals ident]) (get-in state [:globals]))
(if-let [value (get-in state [:globals ident])]
(return* state value)
(fail* (str "Unrecognized identifier: " ident)))))
(defn define [name value]
(fn [state]
;; (prn 'define name value (assoc-in state [:globals name] value))
(return* (assoc-in state [:globals name] value) nil)))
(defn fn-call [f args]
;; (prn 'fn-call/call f args (first args) (second args))
;; (prn 'fn-call/output* (f (first args)))
;; (prn 'fn-call/output* ((f (first args)) (second args)))
(let [output (reduce #(%1 %2) f args)]
;; (prn 'fn-call/output output)
(return output)))
(defmacro ^:private defeval [name match return]
`(def ~name
(fn [state#]
(let [~'*token* (first (:forms state#))]
;; (prn '~name ~'*token*)
;; (prn '~name state#)
(match ~'*token*
~match
(let [output# (~return (update-in state# [:forms] rest))]
;; (prn "output#" output#)
output#)
_#
(do ;; (println "Unknown syntax: " (pr-str ~'*token*))
(fail* (str "Unknown syntax: " (pr-str ~'*token*)))))))))
(defeval eval-ident
[::&parser/ident ?ident]
(resolve ?ident))
(defeval eval-int
[::&parser/int ?int]
(return ?int))
(defeval eval-float
[::&parser/float ?float]
(return ?float))
(defeval eval-def
[::&parser/def ?form ?body]
(exec [;; :let [_ (prn 'eval-defdata ?form ?cases)]
=value (apply-m &compiler/compile-form (wrap *token*))
;; :let [_ (prn 'eval-def 'DONE =value)]
:let [=name (match ?form
[::&parser/fn-call [::&parser/ident ?name] ?args]
?name
[::&parser/ident ?name]
?name)
=value* (clojure.core/eval =value)
;; _ (prn '=value* =value*)
]
]
(define =name =value*)))
(defeval eval-defdata
[::&parser/defdata ?form & ?cases]
(exec [;; :let [_ (prn 'eval-defdata ?form ?cases)]
_ (apply-m &compiler/compile-form (wrap `[::&parser/defdata ~?form ~@?cases]))
;; :let [_ (prn 'eval-defdata 'DONE)]
]
(return nil)))
(defeval eval-get
[::&parser/get ?tag [::&parser/ident ?record]]
(exec [=record (resolve ?record)]
(return (get =record ?tag))))
(defeval eval-set
[::&parser/set ?tag ?value [::&parser/ident ?record]]
(exec [state &util/get-state
=value (apply-m eval-form (wrap-in state ?value))
=record (resolve ?record)]
(return (assoc =record ?tag =value))))
(defeval eval-remove
[::&parser/remove ?tag [::&parser/ident ?record]]
(exec [=record (resolve ?record)]
(return (dissoc =record ?tag))))
(defeval eval-fn-call
[::&parser/fn-call ?fn ?args]
(exec [state &util/get-state
=fn (apply-m eval-form (wrap-in state ?fn))
;; :let [_ (prn '=fn ?fn =fn)]
=args (map-m (fn [arg] (apply-m eval-form (wrap-in state arg)))
?args)
;; :let [_ (prn '=args =args)]
]
(fn-call =fn =args)))
(def eval-form
(try-all-m [eval-int
eval-float
eval-ident
eval-def
eval-defdata
eval-get
eval-set
eval-remove
eval-fn-call]))
(defn eval [text]
(match ((repeat-m eval-form) text)
[::&util/ok [?state ?forms]]
(if (empty? (:forms ?state))
?forms
(assert false (str "Unconsumed input: " ?state)))
[::&util/failure ?message]
(assert false ?message)))
(comment
(let [source-code (slurp "src/example/test1.lang")
tokens (&lexer/lex source-code)
;; _ (prn 'tokens tokens)
syntax (&parser/parse tokens)
;; _ (prn 'syntax syntax)
]
(eval (update-in +state+ [:forms] concat syntax)))
;; (defdata (List x)
;; (#Nil [])
;; (#Cons [x] (List x)))
;; (def (** base exp)
;; (fold * 1 (repeat exp base)))
;; Syntax for chars: #"a"
;; (set@ {#z 30} bar) (set@ {#z 30 #w "YOLO"} bar)
;; (remove@ [#x #y] bar)
;; (get@ [#x #y] bar)
)
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