46 lines
876 B
OCaml
46 lines
876 B
OCaml
module S = struct
|
|
type t = string
|
|
|
|
let compare (x : t) y = Stdlib.compare x y
|
|
|
|
let pp = Fmt.string
|
|
end
|
|
|
|
include S
|
|
|
|
let fresh, reset =
|
|
let r = ref 0 in
|
|
(fun () -> incr r; Printf.sprintf "_x%d" !r),
|
|
(fun () -> r := 0)
|
|
|
|
type 'a subst = (t * 'a) list
|
|
|
|
let pp_subst pp_val =
|
|
let pp_kv ff (x, v) = Format.fprintf ff "%a\\%a" pp x pp_val v in
|
|
Fmt.(box (list ~sep:comma pp_kv))
|
|
|
|
let empty = []
|
|
|
|
let extend x v xs = (x, v) :: xs
|
|
|
|
let assoc = List.assoc
|
|
|
|
let singleton x v = [(x, v)]
|
|
|
|
let trim xs =
|
|
List.fold_right
|
|
(fun (x, v) xs -> (x, v) :: List.remove_assoc x xs)
|
|
xs
|
|
[]
|
|
|
|
let domain xs = trim xs |> List.map fst
|
|
|
|
type 'a rel = 'a -> 'a -> bool
|
|
|
|
let included r xs ys =
|
|
try List.for_all (fun (x, v) -> r v (List.assoc x ys)) (trim xs)
|
|
with Not_found -> false
|
|
|
|
let equal_subst eq xs ys = included eq xs ys && included eq ys xs
|
|
|
|
module Set = Set.Make(S)
|