Source file top_closure.ml
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module Make (Keys : Top_closure_intf.Keys) (Monad : Monad_intf.S) = struct
open Monad.O
let top_closure ~key ~deps elements =
let rec loop res visited elt ~temporarily_marked =
let key = key elt in
if Keys.mem temporarily_marked key
then Monad.return (Error [ elt ])
else if not (Keys.mem visited key)
then (
let visited = Keys.add visited key in
let temporarily_marked = Keys.add temporarily_marked key in
deps elt
>>= iter_elts res visited ~temporarily_marked
>>| function
| Error l -> Error (elt :: l)
| Ok (res, visited) ->
let res = elt :: res in
Ok (res, visited))
else Monad.return (Ok (res, visited))
and iter_elts res visited elts ~temporarily_marked =
match elts with
| [] -> Monad.return (Ok (res, visited))
| elt :: elts ->
loop res visited elt ~temporarily_marked
>>= (function
| Error _ as result -> Monad.return result
| Ok (res, visited) -> iter_elts res visited elts ~temporarily_marked)
in
iter_elts [] Keys.empty elements ~temporarily_marked:Keys.empty
>>| function
| Ok (res, _visited) -> Ok (List.rev res)
| Error elts -> Error elts
;;
end
[@@inline always]
module Int = Make (Int.Set) (Monad.Id)
module String = Make (String.Set) (Monad.Id)