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83 lines
2.4 KiB
83 lines
2.4 KiB
(*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*)
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(** Qset - Set with (signed) rational multiplicity for each element *)
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open Import0
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include Qset_intf
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module Make (Elt : sig
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type t [@@deriving compare, sexp_of]
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end) =
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struct
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module M = Map.Make (Elt)
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type elt = Elt.t
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type t = Q.t M.t
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let compare = M.compare Q.compare
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let equal = M.equal Q.equal
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let hash_fold_t hash_fold_elt s m =
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let hash_fold_q s q = Hash.fold_int s (Hashtbl.hash q) in
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M.fold m
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~init:(Hash.fold_int s (M.length m))
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~f:(fun ~key ~data state -> hash_fold_q (hash_fold_elt state key) data)
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let sexp_of_t s =
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let sexp_of_q q = Sexp.Atom (Q.to_string q) in
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List.sexp_of_t
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(Sexplib.Conv.sexp_of_pair Elt.sexp_of_t sexp_of_q)
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(M.to_alist s)
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let t_of_sexp elt_of_sexp sexp =
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let q_of_sexp = function
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| Sexp.Atom s -> Q.of_string s
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| _ -> assert false
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in
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List.fold_left
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~f:(fun m (key, data) -> M.add_exn m ~key ~data)
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~init:M.empty
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(List.t_of_sexp
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(Sexplib.Conv.pair_of_sexp elt_of_sexp q_of_sexp)
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sexp)
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let pp sep pp_elt fs s = List.pp sep pp_elt fs (M.to_alist s)
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let empty = M.empty
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let if_nz q = if Q.equal Q.zero q then None else Some q
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let add m x i =
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M.change m x ~f:(function Some j -> if_nz Q.(i + j) | None -> if_nz i)
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let remove m x = M.remove m x
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let union m n =
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M.merge m n ~f:(fun ~key:_ -> function
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| `Both (i, j) -> if_nz Q.(i + j) | `Left i | `Right i -> Some i )
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let map m ~f =
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let m' = empty in
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let m, m' =
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M.fold m ~init:(m, m') ~f:(fun ~key:x ~data:i (m, m') ->
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let x', i' = f x i in
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if x' == x then
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if Q.equal i' i then (m, m') else (M.set m ~key:x ~data:i', m')
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else (M.remove m x, add m' x' i') )
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in
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M.fold m' ~init:m ~f:(fun ~key:x ~data:i m -> add m x i)
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let map_counts m ~f = M.mapi ~f:(fun ~key ~data -> f key data) m
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let length m = M.length m
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let count m x = match M.find m x with Some q -> q | None -> Q.zero
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let min_elt_exn = M.min_elt_exn
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let min_elt = M.min_elt
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let to_list m = M.to_alist m
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let iter m ~f = M.iteri ~f:(fun ~key ~data -> f key data) m
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let exists m ~f = M.existsi ~f:(fun ~key ~data -> f key data) m
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let fold m ~f ~init = M.fold ~f:(fun ~key ~data -> f key data) m ~init
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end
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