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core.cljc
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core.cljc
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(ns matchete.core
(:refer-clojure :rename {some core-some
and core-and
or core-or}
:exclude [not])
(:require [clojure.math.combinatorics :as combo]
[clojure.set :as set]))
(defn lvar? [x]
(core-and (simple-symbol? x) (= \? (first (name x)))))
(defn mvar? [x]
(core-and (simple-symbol? x) (= \! (first (name x)))))
(defn placeholder? [x]
(core-and ((some-fn lvar? mvar?) x)
(= \_ (second (name x)))))
(defn pattern? [P]
(core-or (:pattern (meta P))
((some-fn lvar? mvar?) P)
(core-and ((some-fn map? sequential? set?) P)
(core-some pattern? P))))
(declare pattern)
(defn- simple-map-pattern [P]
(let [P (reduce-kv #(assoc %1 %2 (pattern %3)) {} P)]
(fn [data ms]
(reduce-kv
(fn [ms k v]
(core-or (seq (v (get data k) ms)) (reduced ())))
ms
P))))
(defn- complex-map-pattern [P]
(if (empty? P)
(fn [_data ms] ms)
(let [M (pattern (seq P))]
(fn [data ms]
(mapcat #(M % ms)
(filter #(apply distinct? (map first %))
(combo/selections data (count P))))))))
(defn map-pattern [P]
(let [{scalar-keys false variable-keys true} (group-by pattern? (keys P))
simple-pattern (simple-map-pattern (select-keys P scalar-keys))
complex-pattern (complex-map-pattern (select-keys P variable-keys))]
(with-meta
(fn [data ms]
(when (core-and (map? data)
(>= (count data)
(count P))
(every? #(contains? data %) scalar-keys))
(let [simple-data (select-keys data scalar-keys)
rest-data (apply dissoc data scalar-keys)]
(when-let [ms' (seq (simple-pattern simple-data ms))]
(complex-pattern rest-data ms')))))
{:pattern true})))
(defn- seq-pattern [P]
(let [[P [_ TP :as tail]] (split-with #(not= '& %) P)
P (mapv pattern P)
TP (when (seq tail) (pattern TP))]
(with-meta
(fn [data ms]
(when (core-and (sequential? data)
(>= (count data) (count P)))
(reduce
(fn [ms [P data]]
(core-or (seq (P data ms)) (reduced ())))
ms
(concat (partition 2 (interleave P data))
(when TP (list [TP (drop (count P) data)]))))))
{:pattern true})))
(defn- complex-set-pattern [P]
(if (empty? P)
(fn [_data ms] ms)
(let [M (pattern (seq P))]
(fn [data ms]
(mapcat #(M % ms)
(filter #(apply distinct? %)
(combo/selections data (count P))))))))
(defn- set-pattern [P]
(let [{scalar-items false variable-items true} (group-by pattern? P)
scalar-items (set scalar-items)
M (complex-set-pattern variable-items)]
(with-meta
(fn [data ms]
(when (core-and (set? data)
(>= (count data)
(count P))
(set/subset? scalar-items data))
(M (set/difference data scalar-items) ms)))
{:pattern true})))
(defn- lvar-pattern [P]
(with-meta
(fn [data ms]
(sequence
(comp
(remove #(core-and (contains? % P) (not= data (get % P))))
(map (fn [m]
(core-or (core-and (contains? m P) m)
(let [{::keys [guards] :as m} (assoc m P data)]
(core-or (core-and (empty? guards) m)
(reduce
(fn [m guard]
(case (guard m)
true m
false (reduced nil)
(update m ::guards conj guard)))
(assoc m ::guards [])
guards))))))
(filter some?))
ms))
{:pattern true}))
(defn- placeholder-pattern [P]
(if (> (count (name P)) 2)
(lvar-pattern P)
(with-meta
(fn [_data ms] ms)
{:pattern true})))
(defn- data-pattern [P]
(with-meta
(fn [data ms]
(when (= data P) ms))
{:pattern true}))
(defn scan
([P]
(let [M (pattern P)]
(with-meta
(fn [data ms]
(when ((some-fn sequential? map?) data)
(mapcat #(M % ms) data)))
{:pattern true})))
([index-P value-P]
(let [M (pattern [index-P value-P])]
(with-meta
(fn [data ms]
(cond
(map? data)
(mapcat #(M [% (get data %)] ms) (keys data))
(sequential? data)
(apply concat (map-indexed #(M [%1 %2] ms) data))))
{:pattern true}))))
(defn each [P]
(let [M (pattern P)]
(with-meta
(fn [data ms]
(when (sequential? data)
(reduce
(fn [ms item]
(core-or (seq (M item ms)) (reduced ())))
ms
data)))
{:pattern true})))
(defn some [P]
(let [M (pattern P)]
(with-meta
(fn [data ms]
(when (sequential? data)
(let [[found-one? ms]
(reduce
(fn [[found-one? ms] item]
(if-let [ms' (seq (M item ms))]
[true ms']
[found-one? ms]))
[false ms]
data)]
(if found-one? ms ()))))
{:pattern true})))
(defn and
([P] (pattern P))
([P & PS]
(let [MS (mapv pattern (list* P PS))]
(with-meta
(fn [data ms]
(reduce
(fn [ms M]
(core-or (seq (M data ms)) (reduced ())))
ms
MS))
{:pattern true}))))
(defn or
([P] (pattern P))
([P & PS]
(let [MS (mapv pattern (list* P PS))]
(with-meta
(fn [data ms]
(reduce
(fn [ms' M]
(if-let [ms' (seq (M data ms))]
(reduced ms')
ms'))
()
MS))
{:pattern true}))))
(defn only-one
([P] (pattern P))
([P & PS]
(let [MS (mapv pattern (list* P PS))]
(with-meta
(fn [data ms]
(second
(reduce
(fn [[ok-already? ms' :as r] M]
(if ok-already?
(if (seq (M data ms))
(reduced [false ()])
r)
(if-let [ms' (seq (M data ms))]
[true ms']
[ok-already? ms'])))
[false ()]
MS)))
{:pattern true}))))
(defn not [P]
(let [M (pattern P)]
(with-meta
(fn [data ms]
(when-not (seq (M data ms))
ms))
{:pattern true})))
(defn if*
([cond-pattern then-pattern]
(if* cond-pattern then-pattern ::empty))
([cond-pattern then-pattern else-pattern]
(let [cond-m (pattern cond-pattern)
then-m (pattern then-pattern)
else-m (when (not= ::empty else-pattern)
(pattern else-pattern))]
(with-meta
(fn [data ms]
(if-let [ms' (seq (cond-m data ms))]
(then-m data ms')
(when else-m (else-m data ms))))
{:pattern true}))))
(defn open-map [map-pattern]
(let [M (into {} (map (fn [[k v]]
[k (pattern v)]))
map-pattern)]
(with-meta
(fn [data ms]
(when (map? data)
(reduce-kv
(fn [ms k v]
(if (contains? M k)
(core-or (seq ((get M k) v ms)) (reduced ()))
ms))
ms
data)))
{:pattern true})))
(defn predicate
([pred]
(predicate pred nil))
([pred dest]
(with-meta
(fn [data ms]
(when (pred data)
(core-or
(core-and (some? dest)
(sequence
(map #(assoc % dest data))
ms))
ms)))
{:pattern true})))
(defn guard [pred]
(with-meta
(fn [_ ms]
(sequence
(filter pred)
ms))
{:pattern true}))
(defn aggregate-by
([aggr-fn]
(with-meta
(fn [data ms]
(sequence
(comp
(map #(aggr-fn % data))
(filter some?))
ms))
{:pattern true}))
([aggr-fn dest]
(aggregate-by #(update %1 dest aggr-fn %2))))
(defn update-at [dest f]
(with-meta
(fn [data ms]
(sequence
(comp
(map #(update % dest f data))
(filter some?))
ms))
{:pattern true}))
(defn reshape-by [tr-fn P]
(let [M (pattern P)]
(with-meta
(fn [data ms]
(M (tr-fn data) ms))
{:pattern true})))
(defn- find-lvars [expr]
(cond
(coll? expr)
(set (mapcat find-lvars expr))
((some-fn lvar? mvar?) expr)
(list expr)
:else
nil))
(defn check-guard [guard ms]
(sequence
(comp
(map (fn [m]
(case (guard m)
true m
false nil
(update m ::guards (fnil conj []) guard))))
(filter some?))
ms))
(defmacro formula [expr & [dest]]
(let [m (gensym)
lvars (find-lvars expr)]
`(and
(with-meta
(fn [data# ms#]
(letfn [(f# [~m]
(if (every? #(contains? ~m %) ~(mapv (fn [s] `(symbol ~(name s))) lvars))
(let [{:syms ~(vec lvars) :as x#} ~m]
(= data# ~expr))
f#))]
(check-guard f# ms#)))
{:pattern true})
~@(if dest `((symbol ~(name dest))) ()))))
(defn result-of [f & [dest]]
(let [lvars (:lvars (meta f))
guard (with-meta
(fn [data ms]
(letfn [(f' [m]
(if (every? #(contains? m %) lvars)
(= data (f m))
f'))]
(check-guard f' ms)))
{:pattern true})]
(if dest
(and guard dest)
guard)))
(defn pattern [P]
(cond
(:pattern (meta P))
P
(map? P)
(map-pattern P)
(set? P)
(set-pattern P)
(sequential? P)
(seq-pattern P)
(placeholder? P)
(placeholder-pattern P)
(lvar? P)
(lvar-pattern P)
(mvar? P)
(aggregate-by (fnil conj []) (symbol (str "?" (subs (name P) 1))))
:else
(data-pattern P)))
(defn matcher [P]
(let [M (pattern P)]
(with-meta
(fn f
([data] (f data {}))
([data preconditions]
(sequence
(comp
(remove #(not-empty (::guards %)))
(map #(dissoc % ::guards)))
(M data [preconditions]))))
{:matcher true})))
(defn match?
([M data] (match? M {} data))
([M preconditions data]
(boolean (seq ((if (:matcher (meta M)) M (matcher M)) data preconditions)))))
(defn matches
([M data] (matches M {} data))
([M preconditions data]
(sequence
(map (fn [m]
(into {} (remove #(placeholder? (first %))) m)))
((if (:matcher (meta M)) M (matcher M)) data preconditions))))