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core.cljc
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core.cljc
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(ns allpa.core
#?(:clj (:require [clojure.string :as string]
[clojure.walk :as walk]
[clojure.core.match]
[net.cgrand.macrovich :as macros])
:cljs (:require [cljs.core.match]))
#?(:cljs (:require-macros [allpa.core :refer [varg# deftagged match defn-match fn-match]]
[net.cgrand.macrovich :as macros]
[cljs.core.match]
)))
(def clj? #?(:clj true :cljs false))
;; util
(defn parse-int
([s] (parse-int s nil))
([s default]
(let [tried (try
#?(:cljs (js/parseInt s 10)
:clj (Integer/parseInt s))
#?(:cljs (catch js/Object e default)
:clj (catch Exception e default)))]
(if (int? tried) tried default))))
(defn num-lookup [n]
(nth ["A" "B" "C" "D" "E" "F" "G" "H" "I" "J" "K" "L" "M"
"N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "X" "Y" "Z"]
n))
(defn Err [arg]
#?(:clj (Exception. arg)
:cljs (js/Error. arg)))
(defn alpha-num [n]
(if (< n 26)
(num-lookup n)
(str (alpha-num (dec (quot n 26))) (num-lookup (mod n 26)))))
(defn curry [f & args2]
(fn [& args1]
(apply f (concat args1 args2))))
;; macros
#?(:clj
(defmacro varg# [& statements]
(let [args (gensym "args")]
`(fn [& ~args]
~@(->> statements
(walk/postwalk (fn [sym]
(let [sym-name (if (symbol? sym) (name sym) "")]
(if (string/starts-with? sym-name "%")
`(nth ~args ~(-> sym-name (subs 1) (parse-int -1) dec) nil)
sym)))))))))
;; math
(defn power [b e]
(if (< e 0) 0
#?(:clj (int (Math/floor (Math/pow b e)))
:cljs (.round js/Math (.floor js/Math (.pow js/Math b e))))))
(def p2 (partial power 2))
;; i hate defrecord/defprotocol
(def mk (varg# (assoc %2 ::type %1)))
(def Default ::Default)
(def type ::type)
(def id ::id)
(def set-id #(assoc %1 ::id %2))
#?(:clj
(defmacro deftagged [label argv-raw]
(let [required (remove vector? argv-raw)
defaults (->> argv-raw
(filter vector?)
(mapcat #(-> %1))
(map #(-> [%1 %2]) (range))
(filter (fn [[id _]] (odd? id)))
(map #(nth %1 1)))
argv (->> argv-raw
(filter vector?)
(mapcat #(-> %1))
(map #(-> [%1 %2]) (range))
(filter (fn [[id _]] (even? id)))
(map #(nth %1 1))
(concat required))
splat (gensym "splat")
mkkw #(if (Character/isUpperCase (first (str %1)))
(keyword (str *ns*) (str %1))
(keyword %1))]
`(def ~label
(with-meta
(fn [& ~splat]
(when (< (count ~splat) ~(count required))
(throw (Err ~(str *ns* "/" label " must have at least " (count required) " arguments"))))
(when (> (count ~splat) ~(count argv))
(throw (Err ~(str *ns* "/" label " can have no more than " (count argv) " arguments"))))
(mk ~(keyword (str *ns*) (name label))
~(if (empty? argv) '{}
`(let [[~@argv] (concat ~splat (drop (- (count ~splat) ~(count required))
[~@defaults]))]
(hash-map ~@(mapcat #(-> [(mkkw %1) %1]) argv))))))
{:allpa-type ~(keyword (str *ns*) (name label))})))))
#?(:clj
(defmacro match [v & specs]
{:style/indent 1}
`(~(macros/case :clj 'clojure.core.match/match
:cljs 'cljs.core.match/match)
~v
~@(->> specs
(map (fn [id form]
(if (odd? id) form
(walk/postwalk
(fn [form]
(if (not (list? form)) form
(let [t (gensym "t")
pass (gensym "pass")
[x & xs] form
tagged? (and (symbol? x)
(Character/isUpperCase (first (name x))))]
(if (not tagged?) form
(merge {::type `(~pass :guard (fn [~t] (= ~t (-> ~x meta :allpa-type))))}
(apply hash-map (->> xs
(reduce
(fn [{:keys [kw? forms]} curr]
(cond
(not kw?) {:kw? true
:forms (conj forms curr)}
(keyword? curr) {:forms (conj forms curr)
:kw? false}
:else {:kw? true
:forms (-> forms
(conj (keyword curr))
(conj curr))}))
{:kw? true :forms []})
:forms)))))))
form)))
(range))))))
#?(:clj
(defmacro defn-match
{:style/indent 1}
[label & specs]
(let [splat (gensym "splat")]
`(defn ~label [& ~splat]
(match (vec ~splat) ~@specs)))))
#?(:clj
(defmacro fn-match
[& specs]
(let [splat (gensym "splat")]
`(fn [& ~splat]
(match (vec ~splat) ~@specs)))))