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(ns lang.compiler
(:refer-clojure :exclude [compile])
(: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])
:reload))
(declare compile-form)
;; [Utils]
(def ^:private +state+
{:globals {}
:stack {}
:forms '()})
(defn wrap [x]
(update-in +state+ [:forms] conj x))
(defn wrap* [env x]
(-> +state+
(update-in [:stack] merge env)
(update-in [:forms] conj x)))
(defmacro ^:private defcompiler [name match return]
`(def ~name
(fn [state#]
(let [~'*token* (first (:forms state#))]
;; (prn '~name ~'*token*)
(match ~'*token*
~match
(let [output# (~return (update-in state# [:forms] rest))]
;; (prn "output#" output#)
output#)
_#
(fail* (str "Unknown syntax: " (pr-str ~'*token*))))))))
(defn unwrap-ident [ident]
(match ident
[::&parser/ident ?label]
?label))
(defn unwrap-tagged [ident]
(match ident
[::&parser/tagged ?tag ?data]
[?tag ?data]))
(defcompiler compile-int
[::&parser/int ?int]
(return ?int))
(defcompiler compile-float
[::&parser/float ?float]
(return ?float))
(defcompiler compile-ident
[::&parser/ident ?name]
(return (symbol ?name)))
(defcompiler compile-tuple
[::&parser/tuple ?elems]
(exec [=elems (map-m (fn [elem] (apply-m compile-form (wrap elem)))
?elems)]
(return (vec =elems))))
(defcompiler compile-tagged
[::&parser/tagged ?tag ?data]
(exec [=data (apply-m compile-form (wrap ?data))]
(return {:tag ?tag :data =data})))
(defcompiler compile-fn-call
[::&parser/fn-call ?fn ?args]
(exec [=fn (apply-m compile-form (wrap ?fn))
=args (map-m (fn [arg] (apply-m compile-form (wrap arg)))
?args)]
(return (reduce (fn [f a] `(~f ~a))
=fn =args))))
(defcompiler compile-if
[::&parser/if ?test ?then ?else]
(exec [=test (apply-m compile-form (wrap ?test))
=then (apply-m compile-form (wrap ?then))
=else (apply-m compile-form (wrap ?else))]
(return `(if ~=test ~=then ~=else))))
(defcompiler compile-case-branch
[::&parser/case-branch [::&parser/tagged ?tag [::&parser/tuple ?bindings]] ?expr]
(exec [:let [=bindings (map (comp symbol unwrap-ident) ?bindings)
fn-env (into {} (for [a =bindings] [a nil]))]
=expr (apply-m compile-form (wrap* fn-env ?expr))]
(return [?tag =bindings =expr])))
(defcompiler compile-case
[::&parser/case ?variant ?branches]
(exec [=variant (apply-m compile-form (wrap ?variant))
=branches (map-m #(apply-m compile-case-branch (wrap %))
?branches)
:let [g!variant (gensym "variant")
=case `(let [~g!variant ~=variant]
(case (:tag ~g!variant)
~@(apply concat (for [[tag bindings expr] =branches]
[tag `(let [~(vec bindings) (:data ~g!variant)]
~expr)]))))
;; _ (prn '=case =case)
]]
(return =case)))
(defcompiler compile-def
[::&parser/def ?form ?body]
(match ?form
[::&parser/fn-call [::&parser/ident ?name] ?args]
(exec [:let [=name (symbol ?name)
=args (map (comp symbol unwrap-ident) ?args)
fn-env (into {} (for [a =args] [a nil]))]
=body (apply-m compile-form (wrap* fn-env ?body))
:let [curled-body (reduce (fn [inner arg] `(fn [~arg] ~inner))
=body (reverse =args))
;; _ (prn 'curled-body curled-body)
fn-def (let [[_ ?arg ?body] curled-body]
`(fn ~=name ~?arg ~?body))
;; _ (prn 'fn-def fn-def)
]]
(return fn-def))
[::&parser/ident ?name]
(apply-m compile-form (wrap ?body))))
(defcompiler compile-defdata
[::&parser/defdata ?form ?cases]
(match ?form
[::&parser/fn-call ?name ?args]
(let [=name (unwrap-ident ?name)
;; _ (prn '=name =name)
=args (map unwrap-ident ?args)
;; _ (prn '=args =args)
=cases (map unwrap-tagged ?cases)
;; _ (prn '=cases =cases)
]
(return `(fn ~(symbol =name) ~(mapv symbol =args))))))
(def compile-form
(try-all-m [compile-int
compile-float
compile-ident
compile-tuple
compile-tagged
compile-if
compile-case
compile-def
compile-defdata
compile-fn-call]))
(defn compile [inputs]
(match ((repeat-m compile-form) inputs)
[::&util/ok [?state ?forms]]
(if (empty? (:forms ?state))
?forms
(assert false (str "Unconsumed input: " ?state)))
[::&util/failure ?message]
(assert false ?message)))
(comment
)
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