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|
(ns lux.analyser.case
(:require [clojure.core.match :as M :refer [match matchv]]
clojure.core.match.array
(lux [base :as & :refer [|do return fail |let]]
[parser :as &parser]
[type :as &type])
(lux.analyser [base :as &&]
[env :as &env])))
;; [Utils]
(defn ^:private analyse-variant [analyse-pattern idx value-type tag value]
(|do [=var &type/fresh-var
_ (&type/check value-type (&/V "lux;VariantT" (&/|list (&/T tag =var))))
[idx* test] (analyse-pattern idx =var value)]
(return (&/T idx* (&/V "VariantTestAC" (&/T tag test))))))
(defn ^:private analyse-pattern [idx value-type pattern]
(prn 'analyse-pattern/pattern (aget pattern 0) (aget pattern 1) (alength (aget pattern 1)))
(matchv ::M/objects [pattern]
[["lux;Meta" [_ pattern*]]]
;; (assert false)
(do (prn 'analyse-pattern/pattern* (aget pattern* 0))
(matchv ::M/objects [pattern*]
[["lux;Symbol" [?module ?name]]]
(return (&/T (inc idx) (&/V "StoreTestAC" (&/T idx (str ?module ";" ?name) value-type))))
[["lux;Bool" ?value]]
(|do [_ (&type/check value-type &type/Bool)]
(return (&/T idx (&/V "BoolTestAC" ?value))))
[["lux;Int" ?value]]
(|do [_ (&type/check value-type &type/Int)]
(return (&/T idx (&/V "IntTestAC" ?value))))
[["lux;Real" ?value]]
(|do [_ (&type/check value-type &type/Real)]
(return (&/T idx (&/V "RealTestAC" ?value))))
[["lux;Char" ?value]]
(|do [_ (&type/check value-type &type/Char)]
(return (&/T idx (&/V "CharTestAC" ?value))))
[["lux;Text" ?value]]
(|do [_ (&type/check value-type &type/Text)]
(return (&/T idx (&/V "TextTestAC" ?value))))
[["lux;Tuple" ?members]]
(|do [=vars (&/map% (fn [_] &type/fresh-var)
(&/|range (&/|length ?members)))
_ (&type/check value-type (&/V "lux;TupleT" =vars))
[idx* tests] (&/fold% (fn [idx+subs mv]
(|let [[idx subs] idx+subs
[?member ?var] mv]
(|do [[idx* test] (analyse-pattern idx ?var ?member)]
(return (&/T idx* (&/|cons test subs))))))
(&/T idx (&/|list))
(&/zip2 ?members =vars))]
(return (&/T idx* (&/V "TupleTestAC" (&/|reverse tests)))))
[["lux;Record" ?fields]]
(|do [=vars (&/map% (fn [_] &type/fresh-var)
(&/|range (&/|length ?fields)))
_ (&type/check value-type (&/V "lux;RecordT" (&/zip2 (&/|keys ?fields) =vars)))
tests (&/fold% (fn [idx+subs mv]
(|let [[idx subs] idx+subs
[[slot value] ?var] mv]
(|do [[idx* test] (analyse-pattern idx ?var value)]
(return (&/T idx* (&/|cons (&/T slot test) subs))))))
(&/T idx (&/|list)) (&/zip2 ?fields =vars))]
(return (&/V "RecordTestAC" tests)))
[["lux;Tag" ?tag]]
(analyse-variant analyse-pattern idx value-type ?tag (&/V "lus;Meta" (&/T (&/T "" -1 -1)
(&/V "lux;Tuple" (&/|list)))))
[["lux;Form" ["lux;Cons" [["lus;Meta" [_ ["lux;Tag" ?tag]]]
["lux;Cons" [?value
["lux;Nil" _]]]]]]]
(analyse-variant analyse-pattern idx value-type ?tag ?value)
))
))
(defn ^:private with-test [test body]
(matchv ::M/objects [test]
[["StoreTestAC" [?idx ?name ?type]]]
(&env/with-local ?name ?type
body)
[["TupleTestAC" ?tests]]
(&/fold #(with-test %2 %1) body (&/|reverse ?tests))
[["RecordTestAC" ?tests]]
(&/fold #(with-test %2 %1) body (&/|reverse (&/|vals ?tests)))
[["VariantTestAC" [?tag ?value]]]
(with-test ?value body)
[_]
body
))
(defn ^:private analyse-branch [analyse exo-type value-type pattern body match]
(|do [idx &env/next-local-idx
[idx* =test] (analyse-pattern idx value-type pattern)
=body (with-test =test
(&&/analyse-1 analyse exo-type body))]
(matchv ::M/objects [match]
[["MatchAC" ?patterns]]
(return (&/V "MatchAC" (&/|cons (&/T =test =body) ?patterns))))))
(let [compare-kv #(compare (aget %1 0) (aget %2 0))]
(defn ^:private merge-total [struct test+body]
(prn 'merge-total (aget struct 0) (aget test+body 0 0))
(matchv ::M/objects [test+body]
[[test _]]
(matchv ::M/objects [struct test]
[["DefaultTotal" total?] ["StoreTestAC" [?idx ?name type]]]
(return (&/V "DefaultTotal" true))
[[?tag [total? ?values]] ["StoreTestAC" [?idx ?name type]]]
(return (&/V ?tag (&/T true ?values)))
[["DefaultTotal" total?] ["BoolTestAC" ?value]]
(return (&/V "BoolTotal" (&/T total? (&/|list ?value))))
[["BoolTotal" [total? ?values]] ["BoolTestAC" ?value]]
(return (&/V "BoolTotal" (&/T total? (&/|cons ?value ?values))))
[["DefaultTotal" total?] ["IntTestAC" ?value]]
(return (&/V "IntTotal" (&/T total? (&/|list ?value))))
[["IntTotal" [total? ?values]] ["IntTestAC" ?value]]
(return (&/V "IntTotal" (&/T total? (&/|cons ?value ?values))))
[["DefaultTotal" total?] ["RealTestAC" ?value]]
(return (&/V "RealTotal" (&/T total? (&/|list ?value))))
[["RealTotal" [total? ?values]] ["RealTestAC" ?value]]
(return (&/V "RealTotal" (&/T total? (&/|cons ?value ?values))))
[["DefaultTotal" total?] ["CharTestAC" ?value]]
(return (&/V "CharTotal" (&/T total? (&/|list ?value))))
[["CharTotal" [total? ?values]] ["CharTestAC" ?value]]
(return (&/V "CharTotal" (&/T total? (&/|cons ?value ?values))))
[["DefaultTotal" total?] ["TextTestAC" ?value]]
(return (&/V "TextTotal" (&/T total? (&/|list ?value))))
[["TextTotal" [total? ?values]] ["TextTestAC" ?value]]
(return (&/V "TextTotal" (&/T total? (&/|cons ?value ?values))))
[["DefaultTotal" total?] ["TupleTestAC" ?tests]]
(|do [structs (&/map% (fn [t]
(merge-total (&/V "DefaultTotal" total?) t))
?tests)]
(return (&/V "TupleTotal" (&/T total? structs))))
[["TupleTotal" [total? ?values]] ["TupleTestAC" ?tests]]
(if (= (&/|length ?values) (&/|length ?tests))
(|do [structs (&/map% (fn [vt]
(|let [[v t] vt]
(merge-total v t)))
(&/zip2 ?values ?tests))]
(return (&/V "TupleTotal" (&/T total? structs))))
(fail "[Pattern-matching error] Inconsistent tuple-size."))
[["DefaultTotal" total?] ["RecordTestAC" ?tests]]
(|do [structs (&/map% (fn [t]
(|let [[slot value] t]
(|do [struct (merge-total (&/V "DefaultTotal" total?) value)]
(return (&/T slot struct)))))
(sort compare-kv ?tests))]
(return (&/V "RecordTotal" (&/T total? structs))))
[["RecordTotal" [total? ?values]] ["RecordTestAC" ?tests]]
(if (= (&/|length ?values) (&/|length ?tests))
(|do [structs (&/map% (fn [lr]
(|let [[[lslot struct] [rslot value]] lr]
(if (= lslot rslot)
(|do [struct (merge-total (&/V "DefaultTotal" total?) value)]
(return (&/T lslot struct)))
(fail "[Pattern-matching error] Record slots mismatch."))))
(&/zip2 ?values
(sort compare-kv ?tests)))]
(return (&/V "RecordTotal" (&/T total? structs))))
(fail "[Pattern-matching error] Inconsistent record-size."))
[["DefaultTotal" total?] ["VariantTestAC" [?tag ?test]]]
(|do [struct (merge-total (&/V "DefaultTotal" total?) ?test)]
(return (&/V "VariantTotal" (&/T total? (&/|list (&/T ?tag struct))))))
[["VariantTotal" [total? ?branches]] ["VariantTestAC" [?tag ?test]]]
(|do [struct (merge-total (or (&/|get ?tag ?branches)
(&/V "DefaultTotal" total?))
?test)]
(return (&/V "VariantTotal" (&/T total? (&/|put ?tag struct ?branches)))))
))))
(defn ^:private totality-struct [owner-total? match]
(let [msg "Pattern matching is non-total"]
(matchv ::M/objects [match]
[["MatchAC" ?tests]]
(&/fold% merge-total (&/V "DefaultTotal" false) ?tests))))
(defn ^:private check-totality [value-type struct]
(prn 'check-totality (aget value-type 0) (aget struct 0) (&type/show-type value-type))
(matchv ::M/objects [value-type struct]
[_ ["DefaultTotal" true]]
true
))
;; [Exports]
(defn analyse-branches [analyse exo-type value-type branches]
(|do [=match (&/fold% (fn [match branch]
(|let [[pattern body] branch]
(analyse-branch analyse exo-type value-type pattern body match)))
(&/V "MatchAC" (&/|list))
branches)
struct (totality-struct false =match)]
(matchv ::M/objects [=match]
[["MatchAC" ?tests]]
(if (check-totality value-type struct)
(return (&/V "MatchAC" (&/|reverse ?tests)))
(fail "[Pattern-maching error] Pattern-matching is non-total.")))))
|
