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fns.cljc
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fns.cljc
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(ns sci.impl.fns
{:no-doc true}
(:require
[sci.impl.types :as types]
[sci.impl.utils :as utils :refer [kw-identical?]])
#?(:cljs (:require-macros [sci.impl.fns :refer [gen-fn]])))
#?(:clj (set! *warn-on-reflection* true))
(defmacro gen-fn
([n]
`(gen-fn ~n false))
([n disable-arity-checks]
`(gen-fn ~n ~disable-arity-checks false))
([n _disable-arity-checks varargs]
(if (zero? n)
(let [varargs-param (when varargs (gensym))]
`(fn ~'arity-0 ~(cond-> []
varargs (conj '& varargs-param))
(let [~'invoc-array (when-not (zero? ~'invoc-size)
(object-array ~'invoc-size))]
(when ~'enclosed->invocation
(~'enclosed->invocation ~'enclosed-array ~'invoc-array))
~@(when varargs
[`(aset ~'invoc-array ~'vararg-idx ~varargs-param)])
(loop []
(let [ret# (types/eval ~'body ~'ctx ~'invoc-array)]
(if (kw-identical? :sci.impl.analyzer/recur ret#)
(recur)
ret#))))))
(let [fn-params (vec (repeatedly n gensym))
varargs-param (when varargs (gensym))
asets `(do ~@(map (fn [fn-param idx]
`(aset ~(with-meta 'invoc-array
{:tag 'objects}) ~idx ~fn-param))
fn-params (range)))]
`(fn ~(symbol (str "arity-" n)) ~(cond-> fn-params
varargs (conj '& varargs-param))
(let [~'invoc-array (when-not (zero? ~'invoc-size)
(object-array ~'invoc-size))]
(when ~'enclosed->invocation
(~'enclosed->invocation ~'enclosed-array ~'invoc-array))
~asets
~@(when varargs
[`(aset ~'invoc-array ~'vararg-idx ~varargs-param)])
(loop []
(let [ret# (types/eval ~'body ~'ctx ~'invoc-array)]
(if (kw-identical? :sci.impl.analyzer/recur ret#)
(recur)
ret#)))))))))
#_(require '[clojure.pprint :as pprint])
#_(binding [*print-meta* true]
(pprint/pprint (macroexpand '(gen-run-fn 2))))
#_{:clj-kondo/ignore [:unused-binding]}
(defn fun
([#?(:clj ^clojure.lang.Associative ctx :cljs ctx)
enclosed-array
fn-body
fn-name
macro?]
(fun ctx enclosed-array fn-body fn-name macro?
(:fixed-arity fn-body)
(:copy-enclosed->invocation fn-body)
(:body fn-body)
(:invoc-size fn-body)
(utils/current-ns-name)
(:vararg-idx fn-body)))
([#?(:clj ^clojure.lang.Associative ctx :cljs ctx)
enclosed-array
fn-body
fn-name
macro?
fixed-arity
enclosed->invocation
body
invoc-size
nsm vararg-idx]
(let [f (if vararg-idx
(case #?(:clj (int fixed-arity)
:cljs fixed-arity)
0 (gen-fn 0 true true)
1 (gen-fn 1 true true)
2 (gen-fn 2 true true)
3 (gen-fn 3 true true)
4 (gen-fn 4 true true)
5 (gen-fn 5 true true)
6 (gen-fn 6 true true)
7 (gen-fn 7 true true)
8 (gen-fn 8 true true)
9 (gen-fn 9 true true)
10 (gen-fn 10 true true)
11 (gen-fn 11 true true)
12 (gen-fn 12 true true)
13 (gen-fn 13 true true)
14 (gen-fn 14 true true)
15 (gen-fn 15 true true)
16 (gen-fn 16 true true)
17 (gen-fn 17 true true)
18 (gen-fn 18 true true)
19 (gen-fn 19 true true)
20 (gen-fn 20 true true))
(case #?(:clj (int fixed-arity)
:cljs fixed-arity)
0 (gen-fn 0)
1 (gen-fn 1)
2 (gen-fn 2)
3 (gen-fn 3)
4 (gen-fn 4)
5 (gen-fn 5)
6 (gen-fn 6)
7 (gen-fn 7)
8 (gen-fn 8)
9 (gen-fn 9)
10 (gen-fn 10)
11 (gen-fn 11)
12 (gen-fn 12)
13 (gen-fn 13)
14 (gen-fn 14)
15 (gen-fn 15)
16 (gen-fn 16)
17 (gen-fn 17)
18 (gen-fn 18)
19 (gen-fn 19)
20 (gen-fn 20)))]
f)))
(defn lookup-by-arity [arities arity]
(or (get arities arity)
(:variadic arities)))
(defn fn-arity-map [ctx enclosed-array fn-name macro? fn-bodies]
(reduce
(fn [arity-map fn-body]
(let [f (fun ctx enclosed-array fn-body fn-name macro?)
var-arg? (:var-arg-name fn-body)
fixed-arity (:fixed-arity fn-body)]
(if var-arg?
(assoc arity-map :variadic f)
(assoc arity-map fixed-arity f))))
{}
fn-bodies))
;;;; Macros
(defn ^{:private true}
maybe-destructured
[params body]
(if (every? symbol? params)
(cons params body)
(loop [params params
new-params (with-meta [] (meta params))
lets []]
(if params
(if (symbol? (first params))
(recur (next params) (conj new-params (first params)) lets)
(let [gparam (gensym "p__")]
(recur (next params) (conj new-params gparam)
(-> lets (conj (first params)) (conj gparam)))))
`(~new-params
(let ~lets
~@body))))))
(defn fn**
[form _ & sigs]
(let [name (if (symbol? (first sigs)) (first sigs) nil)
sigs (if name (next sigs) sigs)
sigs (if (vector? (first sigs))
(list sigs)
(if (seq? (first sigs))
sigs
;; Assume single arity syntax
(utils/throw-error-with-location
(if (seq sigs)
(str "Parameter declaration "
(first sigs)
" should be a vector")
(str "Parameter declaration missing"))
form)))
psig (fn* [sig]
;; Ensure correct type before destructuring sig
(when (not (seq? sig))
(throw (utils/throw-error-with-location
(str "Invalid signature " sig
" should be a list")
form)))
(let [[params & body] sig
_ (when (not (vector? params))
(utils/throw-error-with-location
(if (seq? (first sigs))
(str "Parameter declaration " params
" should be a vector")
(str "Invalid signature " sig
" should be a list"))
form))
conds (when (and (next body) (map? (first body)))
(first body))
body (if conds (next body) body)
conds (or conds (meta params))
pre (:pre conds)
post (:post conds)
body (if post
`((let [~'% ~(if (< 1 (count body))
`(do ~@body)
(first body))]
~@(map (fn* [c] `(assert ~c)) post)
~'%))
body)
body (if pre
(concat (map (fn* [c] `(assert ~c)) pre)
body)
body)]
(maybe-destructured params body)))
new-sigs (map psig sigs)
expr (with-meta
(if name
(list* 'fn* name new-sigs)
(cons 'fn* new-sigs))
(meta form))]
expr))
(def
^{:private true}
sigs
(fn [fdecl]
#_(assert-valid-fdecl fdecl)
(let [asig
(fn [fdecl]
(let [arglist (first fdecl)
;elide implicit macro args
arglist (if (= '&form (first arglist))
(subvec arglist 2 (count arglist))
arglist)
body (next fdecl)]
(if (map? (first body))
(if (next body)
(with-meta arglist (conj (if (meta arglist) (meta arglist) {}) (first body)))
arglist)
arglist)))
#_#_resolve-tag (fn [argvec]
(let [m (meta argvec)
^clojure.lang.Symbol tag (:tag m)]
(if (instance? clojure.lang.Symbol tag)
(if (clojure.lang.Util/equiv (.indexOf (.getName tag) ".") -1)
(if (clojure.lang.Util/equals nil (clojure.lang.Compiler$HostExpr/maybeSpecialTag tag))
(let [c (clojure.lang.Compiler$HostExpr/maybeClass tag false)]
(if c
(with-meta argvec (assoc m :tag (clojure.lang.Symbol/intern (.getName c))))
argvec))
argvec)
argvec)
argvec)))]
(if (seq? (first fdecl))
(loop [ret [] fdecls fdecl]
(if fdecls
(recur (conj ret (identity #_resolve-tag (asig (first fdecls)))) (next fdecls))
(seq ret)))
(list (identity #_resolve-tag (asig fdecl)))))))
(defn defn* [form _ name & fdecl]
(if (symbol? name)
nil
(utils/throw-error-with-location "First argument to defn must be a symbol" form))
(let [m (if (string? (first fdecl))
{:doc (first fdecl)}
{})
fdecl (if (string? (first fdecl))
(next fdecl)
fdecl)
m (if (map? (first fdecl))
(conj m (first fdecl))
m)
fdecl (if (map? (first fdecl))
(next fdecl)
fdecl)
fdecl (if (vector? (first fdecl))
(list fdecl)
fdecl)
m (if (map? (last fdecl))
(conj m (last fdecl))
m)
fdecl (if (map? (last fdecl))
(butlast fdecl)
fdecl)
;; deleted sigs here
;; _ (prn :fdecl fdecl)
m (conj {:arglists (list 'quote (sigs fdecl))} m)
;; deleted inline here
name-m (meta name)
m (conj (if name-m name-m {}) m)
macro? (:macro name-m)
expr (cons `fn fdecl)
expr (list 'def (with-meta name m)
(if (or macro? name)
(with-meta expr
{:sci.impl/fn {:macro macro?
:fn-name name}})
expr))]
expr))
(defn defmacro*
[_&form _&env name & args]
(let [name (vary-meta name assoc :macro true)
prefix (loop [p (list name) args args]
(let [f (first args)]
(if (string? f)
(recur (cons f p) (next args))
(if (map? f)
(recur (cons f p) (next args))
p))))
fdecl (loop [fd args]
(if (string? (first fd))
(recur (next fd))
(if (map? (first fd))
(recur (next fd))
fd)))
fdecl (if (vector? (first fdecl))
(list fdecl)
fdecl)
add-implicit-args (fn [fd]
(let [args (first fd)]
(cons (vec (cons '&form (cons '&env args))) (next fd))))
add-args (fn [acc ds]
(if (nil? ds)
acc
(let [d (first ds)]
(if (map? d)
(conj acc d)
(recur (conj acc (add-implicit-args d)) (next ds))))))
fdecl (seq (add-args [] fdecl))
decl (loop [p prefix d fdecl]
(if p
(recur (next p) (cons (first p) d))
d))]
(list 'do
(cons `defn decl)
(list 'var name))))
;;;; Scratch
(comment)