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(.module:
[lux #*
[abstract
[monoid (#+ Monoid)]
[functor (#+ Functor)]
[equivalence (#+ Equivalence)]
fold
[predicate (#+ Predicate)]]
[data
["." product]
["." maybe]
[collection
["." list ("#@." fold)]]]
[tool
[compiler
["." host]]]])
(def: #export type-name "#Array")
(type: #export (Array a)
{#.doc "Mutable arrays."}
(#.Primitive ..type-name (#.Cons a #.Nil)))
(with-expansions [<elem-type> (primitive "java.lang.Object")
<array-type> (type (Array <elem-type>))]
(def: #export (new size)
(All [a] (-> Nat (Array a)))
(`` (for {(~~ (static host.old))
(:assume ("jvm anewarray" "(java.lang.Object )" size))
(~~ (static host.jvm))
(:assume
(: (Array (primitive "java.lang.Object"))
("jvm array new" size)))})))
(def: #export (size array)
(All [a] (-> (Array a) Nat))
(`` (for {(~~ (static host.old))
("jvm arraylength" array)
(~~ (static host.jvm))
("jvm array length" (:coerce <array-type> array))})))
(def: #export (read index array)
(All [a]
(-> Nat (Array a) (Maybe a)))
(if (n/< (size array) index)
(`` (for {(~~ (static host.old))
(let [value ("jvm aaload" array index)]
(if ("jvm object null?" value)
#.None
(#.Some value)))
(~~ (static host.jvm))
(let [value ("jvm array read" index (:coerce <array-type> array))]
(if ("jvm object null?" value)
#.None
(#.Some (:assume value))))}))
#.None))
(def: #export (write index value array)
(All [a]
(-> Nat a (Array a) (Array a)))
(`` (for {(~~ (static host.old))
("jvm aastore" array index value)
(~~ (static host.jvm))
(:assume
("jvm array write" index (:coerce <elem-type> value)
(:coerce <array-type> array)))})))
(def: #export (delete index array)
(All [a]
(-> Nat (Array a) (Array a)))
(if (n/< (size array) index)
(`` (for {(~~ (static host.old))
(write index (:assume ("jvm object null")) array)
(~~ (static host.jvm))
(write index (:assume (: <elem-type> ("jvm object null"))) array)}))
array))
)
(def: #export (contains? index array)
(All [a]
(-> Nat (Array a) Bit))
(case (..read index array)
(#.Some _)
true
_
false))
(def: #export (update index transform array)
(All [a]
(-> Nat (-> a a) (Array a) (Array a)))
(case (read index array)
#.None
array
(#.Some value)
(write index (transform value) array)))
(def: #export (upsert index default transform array)
(All [a]
(-> Nat a (-> a a) (Array a) (Array a)))
(write index
(|> array (read index) (maybe.default default) transform)
array))
(def: #export (copy length src-start src-array dest-start dest-array)
(All [a]
(-> Nat Nat (Array a) Nat (Array a)
(Array a)))
(if (n/= 0 length)
dest-array
(list@fold (function (_ offset target)
(case (read (n/+ offset src-start) src-array)
#.None
target
(#.Some value)
(write (n/+ offset dest-start) value target)))
dest-array
(list.indices length))))
(def: #export (occupied array)
{#.doc "Finds out how many cells in an array are occupied."}
(All [a] (-> (Array a) Nat))
(list@fold (function (_ idx count)
(case (read idx array)
#.None
count
(#.Some _)
(inc count)))
0
(list.indices (size array))))
(def: #export (vacant array)
{#.doc "Finds out how many cells in an array are vacant."}
(All [a] (-> (Array a) Nat))
(n/- (occupied array) (size array)))
(def: #export (filter! p xs)
(All [a]
(-> (-> a Bit) (Array a) (Array a)))
(list@fold (function (_ idx xs')
(case (read idx xs)
#.None
xs'
(#.Some x)
(if (p x)
xs'
(delete idx xs'))))
xs
(list.indices (size xs))))
(def: #export (find p xs)
(All [a]
(-> (-> a Bit) (Array a) (Maybe a)))
(let [arr-size (size xs)]
(loop [idx 0]
(if (n/< arr-size idx)
(case (read idx xs)
#.None
(recur (inc idx))
(#.Some x)
(if (p x)
(#.Some x)
(recur (inc idx))))
#.None))))
(def: #export (find+ p xs)
{#.doc "Just like 'find', but with access to the index of each value."}
(All [a]
(-> (-> Nat a Bit) (Array a) (Maybe [Nat a])))
(let [arr-size (size xs)]
(loop [idx 0]
(if (n/< arr-size idx)
(case (read idx xs)
#.None
(recur (inc idx))
(#.Some x)
(if (p idx x)
(#.Some [idx x])
(recur (inc idx))))
#.None))))
(def: #export (clone xs)
(All [a] (-> (Array a) (Array a)))
(let [arr-size (size xs)]
(list@fold (function (_ idx ys)
(case (read idx xs)
#.None
ys
(#.Some x)
(write idx x ys)))
(new arr-size)
(list.indices arr-size))))
(def: #export (from-list xs)
(All [a] (-> (List a) (Array a)))
(product.right (list@fold (function (_ x [idx arr])
[(inc idx) (write idx x arr)])
[0 (new (list.size xs))]
xs)))
(def: underflow Nat (dec 0))
(def: #export (to-list array)
(All [a] (-> (Array a) (List a)))
(loop [idx (dec (size array))
output #.Nil]
(if (n/= underflow idx)
output
(recur (dec idx)
(case (read idx array)
(#.Some head)
(#.Cons head output)
#.None
output)))))
(def: #export (to-list' default array)
(All [a] (-> a (Array a) (List a)))
(loop [idx (dec (size array))
output #.Nil]
(if (n/= underflow idx)
output
(recur (dec idx)
(#.Cons (maybe.default default (read idx array))
output)))))
(structure: #export (equivalence (^open ",@."))
(All [a] (-> (Equivalence a) (Equivalence (Array a))))
(def: (= xs ys)
(let [sxs (size xs)
sxy (size ys)]
(and (n/= sxy sxs)
(list@fold (function (_ idx prev)
(and prev
(case [(read idx xs) (read idx ys)]
[#.None #.None]
true
[(#.Some x) (#.Some y)]
(,@= x y)
_
false)))
true
(list.indices sxs))))))
(structure: #export monoid (All [a] (Monoid (Array a)))
(def: identity (new 0))
(def: (compose xs ys)
(let [sxs (size xs)
sxy (size ys)]
(|> (new (n/+ sxy sxs))
(copy sxs 0 xs 0)
(copy sxy 0 ys sxs)))))
(structure: #export functor (Functor Array)
(def: (map f ma)
(let [arr-size (size ma)]
(if (n/= 0 arr-size)
(new arr-size)
(list@fold (function (_ idx mb)
(case (read idx ma)
#.None
mb
(#.Some x)
(write idx (f x) mb)))
(new arr-size)
(list.indices arr-size))
))))
(structure: #export fold (Fold Array)
(def: (fold f init xs)
(let [arr-size (size xs)]
(loop [so-far init
idx 0]
(if (n/< arr-size idx)
(case (read idx xs)
#.None
(recur so-far (inc idx))
(#.Some value)
(recur (f value so-far) (inc idx)))
so-far)))))
(template [<name> <init> <op>]
[(def: #export (<name> predicate array)
(All [a]
(-> (Predicate a) (Array a) Bit))
(let [size (..size array)]
(loop [idx 0]
(if (n/< size idx)
(case (..read idx array)
(#.Some value)
(<op> (predicate value)
(recur (inc idx)))
#.None
(recur (inc idx)))
<init>))))]
[every? true and]
[any? false or]
)
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