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|
;; Copyright (c) Eduardo Julian. All rights reserved.
;; The use and distribution terms for this software are covered by the
;; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this distribution.
;; By using this software in any fashion, you are agreeing to be bound by
;; the terms of this license.
;; You must not remove this notice, or any other, from this software.
(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 resolve-type [type]
(matchv ::M/objects [type]
[["lux;VarT" ?id]]
(|do [type* (&/try-all% (&/|list (&type/deref ?id)
(fail "##9##")))]
(resolve-type type*))
[["lux;AllT" ?id]]
(|do [$var &type/existential
=type (&type/apply-type type $var)]
(&type/actual-type =type))
;; (&type/with-var
;; (fn [$var]
;; (|do [=type (&type/apply-type type $var)]
;; (&type/actual-type =type))))
[_]
(&type/actual-type type)))
(defn ^:private analyse-pattern [value-type pattern kont]
(matchv ::M/objects [pattern]
[["lux;Meta" [_ pattern*]]]
(matchv ::M/objects [pattern*]
[["lux;SymbolS" ?ident]]
(|do [=kont (&env/with-local (&/ident->text ?ident) value-type
kont)
idx &env/next-local-idx]
(return (&/T (&/V "StoreTestAC" idx) =kont)))
[["lux;BoolS" ?value]]
(|do [_ (&type/check value-type &type/Bool)
=kont kont]
(return (&/T (&/V "BoolTestAC" ?value) =kont)))
[["lux;IntS" ?value]]
(|do [_ (&type/check value-type &type/Int)
=kont kont]
(return (&/T (&/V "IntTestAC" ?value) =kont)))
[["lux;RealS" ?value]]
(|do [_ (&type/check value-type &type/Real)
=kont kont]
(return (&/T (&/V "RealTestAC" ?value) =kont)))
[["lux;CharS" ?value]]
(|do [_ (&type/check value-type &type/Char)
=kont kont]
(return (&/T (&/V "CharTestAC" ?value) =kont)))
[["lux;TextS" ?value]]
(|do [_ (&type/check value-type &type/Text)
=kont kont]
(return (&/T (&/V "TextTestAC" ?value) =kont)))
[["lux;TupleS" ?members]]
(|do [value-type* (resolve-type value-type)]
(do ;; (prn 'PM/TUPLE-1 (&type/show-type value-type*))
(matchv ::M/objects [value-type*]
[["lux;TupleT" ?member-types]]
(do ;; (prn 'PM/TUPLE-2 (&/|length ?member-types) (&/|length ?members))
(if (not (.equals ^Object (&/|length ?member-types) (&/|length ?members)))
(fail (str "[Pattern-matching Error] Pattern-matching mismatch. Require tuple[" (&/|length ?member-types) "]. Given tuple [" (&/|length ?members) "]"))
(|do [[=tests =kont] (&/fold (fn [kont* vm]
(|let [[v m] vm]
(|do [[=test [=tests =kont]] (analyse-pattern v m kont*)]
(return (&/T (&/|cons =test =tests) =kont)))))
(|do [=kont kont]
(return (&/T (&/|list) =kont)))
(&/|reverse (&/zip2 ?member-types ?members)))]
(return (&/T (&/V "TupleTestAC" =tests) =kont)))))
[_]
(fail (str "[Pattern-matching Error] Tuples require tuple-types: " (&type/show-type value-type*))))))
[["lux;RecordS" ?slots]]
(|do [value-type* (resolve-type value-type)]
(matchv ::M/objects [value-type*]
[["lux;RecordT" ?slot-types]]
(if (not (.equals ^Object (&/|length ?slot-types) (&/|length ?slots)))
(fail (str "[Analyser Error] Pattern-matching mismatch. Require record[" (&/|length ?slot-types) "]. Given record[" (&/|length ?slots) "]"))
(|do [[=tests =kont] (&/fold (fn [kont* slot]
(|let [[sn sv] slot]
(matchv ::M/objects [sn]
[["lux;Meta" [_ ["lux;TagS" ?ident]]]]
(|do [=tag (&&/resolved-ident ?ident)]
(if-let [=slot-type (&/|get =tag ?slot-types)]
(|do [[=test [=tests =kont]] (analyse-pattern =slot-type sv kont*)]
(return (&/T (&/|put =tag =test =tests) =kont)))
(fail (str "[Pattern-matching Error] Record-type lacks slot: " =tag))))
[_]
(fail (str "[Pattern-matching Error] Record must use tags as slot-names: " (&/show-ast sn))))))
(|do [=kont kont]
(return (&/T (&/|table) =kont)))
(&/|reverse ?slots))]
(return (&/T (&/V "RecordTestAC" =tests) =kont))))
[_]
(fail "[Pattern-matching Error] Record requires record-type.")))
[["lux;TagS" ?ident]]
(|do [=tag (&&/resolved-ident ?ident)
value-type* (resolve-type value-type)
case-type (&type/variant-case =tag value-type*)
[=test =kont] (analyse-pattern case-type (&/V "lux;Meta" (&/T (&/T "" -1 -1)
(&/V "lux;TupleS" (&/|list))))
kont)]
(return (&/T (&/V "VariantTestAC" (&/T =tag =test)) =kont)))
[["lux;FormS" ["lux;Cons" [["lux;Meta" [_ ["lux;TagS" ?ident]]]
["lux;Cons" [?value
["lux;Nil" _]]]]]]]
(|do [=tag (&&/resolved-ident ?ident)
value-type* (resolve-type value-type)
case-type (&type/variant-case =tag value-type*)
[=test =kont] (analyse-pattern case-type ?value
kont)]
(return (&/T (&/V "VariantTestAC" (&/T =tag =test)) =kont)))
)))
(defn ^:private analyse-branch [analyse exo-type value-type pattern body patterns]
(|do [pattern+body (analyse-pattern value-type pattern
(&&/analyse-1 analyse exo-type body))]
(return (&/|cons pattern+body patterns))))
(let [compare-kv #(.compareTo ^String (aget ^objects %1 0) ^String (aget ^objects %2 0))]
(defn ^:private merge-total [struct test+body]
(|let [[test ?body] test+body]
(matchv ::M/objects [struct test]
[["DefaultTotal" total?] ["StoreTestAC" ?idx]]
(return (&/V "DefaultTotal" true))
[[?tag [total? ?values]] ["StoreTestAC" ?idx]]
(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 t ?body)))
?tests)]
(return (&/V "TupleTotal" (&/T total? structs))))
[["TupleTotal" [total? ?values]] ["TupleTestAC" ?tests]]
(if (.equals ^Object (&/|length ?values) (&/|length ?tests))
(|do [structs (&/map2% (fn [v t]
(merge-total v (&/T t ?body)))
?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?) (&/T value ?body))]
(return (&/T slot struct*)))))
(->> ?tests
&/->seq
(sort compare-kv)
&/->list))]
(return (&/V "RecordTotal" (&/T total? structs))))
[["RecordTotal" [total? ?values]] ["RecordTestAC" ?tests]]
(if (.equals ^Object (&/|length ?values) (&/|length ?tests))
(|do [structs (&/map2% (fn [left right]
(|let [[lslot sub-struct] left
[rslot value]right]
(if (.equals ^Object lslot rslot)
(|do [sub-struct* (merge-total sub-struct (&/T value ?body))]
(return (&/T lslot sub-struct*)))
(fail "[Pattern-matching Error] Record slots mismatch."))))
?values
(->> ?tests
&/->seq
(sort compare-kv)
&/->list))]
(return (&/V "RecordTotal" (&/T total? structs))))
(fail "[Pattern-matching Error] Inconsistent record-size."))
[["DefaultTotal" total?] ["VariantTestAC" [?tag ?test]]]
(|do [sub-struct (merge-total (&/V "DefaultTotal" total?)
(&/T ?test ?body))]
(return (&/V "VariantTotal" (&/T total? (&/|put ?tag sub-struct (&/|table))))))
[["VariantTotal" [total? ?branches]] ["VariantTestAC" [?tag ?test]]]
(|do [sub-struct (merge-total (or (&/|get ?tag ?branches)
(&/V "DefaultTotal" total?))
(&/T ?test ?body))]
(return (&/V "VariantTotal" (&/T total? (&/|put ?tag sub-struct ?branches)))))
))))
(defn ^:private check-totality [value-type struct]
(matchv ::M/objects [struct]
[["BoolTotal" [?total ?values]]]
(return (or ?total
(= #{true false} (set (&/->seq ?values)))))
[["IntTotal" [?total _]]]
(return ?total)
[["RealTotal" [?total _]]]
(return ?total)
[["CharTotal" [?total _]]]
(return ?total)
[["TextTotal" [?total _]]]
(return ?total)
[["TupleTotal" [?total ?structs]]]
(if ?total
(return true)
(|do [value-type* (resolve-type value-type)]
(matchv ::M/objects [value-type*]
[["lux;TupleT" ?members]]
(|do [totals (&/map2% (fn [sub-struct ?member]
(check-totality ?member sub-struct))
?structs ?members)]
(return (&/fold #(and %1 %2) true totals)))
[_]
(fail "[Pattern-maching Error] Tuple is not total."))))
[["RecordTotal" [?total ?structs]]]
(if ?total
(return true)
(|do [value-type* (resolve-type value-type)]
(matchv ::M/objects [value-type*]
[["lux;RecordT" ?fields]]
(|do [totals (&/map% (fn [field]
(|let [[?tk ?tv] field]
(if-let [sub-struct (&/|get ?tk ?structs)]
(check-totality ?tv sub-struct)
(return false))))
?fields)]
(return (&/fold #(and %1 %2) true totals)))
[_]
(fail "[Pattern-maching Error] Record is not total."))))
[["VariantTotal" [?total ?structs]]]
(if ?total
(return true)
(|do [value-type* (resolve-type value-type)]
(matchv ::M/objects [value-type*]
[["lux;VariantT" ?cases]]
(|do [totals (&/map% (fn [case]
(|let [[?tk ?tv] case]
(if-let [sub-struct (&/|get ?tk ?structs)]
(check-totality ?tv sub-struct)
(return false))))
?cases)]
(return (&/fold #(and %1 %2) true totals)))
[_]
(fail "[Pattern-maching Error] Variant is not total."))))
[["DefaultTotal" ?total]]
(return ?total)
))
;; [Exports]
(defn analyse-branches [analyse exo-type value-type branches]
(|do [patterns (&/fold% (fn [patterns branch]
(|let [[pattern body] branch]
(analyse-branch analyse exo-type value-type pattern body patterns)))
(&/|list)
branches)
struct (&/fold% merge-total (&/V "DefaultTotal" false) patterns)
? (check-totality value-type struct)]
(if ?
(return patterns)
(fail "[Pattern-maching Error] Pattern-matching is non-total."))))
|
