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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
module type S =
sig
type label
type data
type t
val empty : t
val get : t -> data
val next : t -> label -> t
val labels : t -> label list
val add : label list -> data -> t -> t
val remove : label list -> data -> t -> t
val iter : (label list -> data -> unit) -> t -> unit
end
module type Grp =
sig
type t
val nil : t
val is_nil : t -> bool
val add : t -> t -> t
val sub : t -> t -> t
end
module Make (Y : Map.OrderedType) (X : Grp) =
struct
module T_codom = Map.Make(Y)
type data = X.t
type label = Y.t
type t = Node of X.t * t T_codom.t
let codom_for_all f m =
let fold key v accu = f v && accu in
T_codom.fold fold m true
let empty = Node (X.nil, T_codom.empty)
let next (Node (_,m)) lbl = T_codom.find lbl m
let get (Node (hereset,_)) = hereset
let labels (Node (_,m)) =
(* FIXME: this is order-dependent. Try to find a more robust presentation? *)
List.rev (T_codom.fold (fun x _ acc -> x::acc) m [])
let is_empty_node (Node(a,b)) = (X.is_nil a) && (T_codom.is_empty b)
let assure_arc m lbl =
if T_codom.mem lbl m then
m
else
T_codom.add lbl (Node (X.nil,T_codom.empty)) m
let cleanse_arcs (Node (hereset,m)) =
let m = if codom_for_all is_empty_node m then T_codom.empty else m in
Node(hereset, m)
let rec at_path f (Node (hereset,m)) = function
| [] ->
cleanse_arcs (Node(f hereset,m))
| h::t ->
let m = assure_arc m h in
cleanse_arcs (Node(hereset,
T_codom.add h (at_path f (T_codom.find h m) t) m))
let add path v tm =
at_path (fun hereset -> X.add v hereset) tm path
let remove path v tm =
at_path (fun hereset -> X.sub hereset v) tm path
let iter f tlm =
let rec apprec pfx (Node(hereset,m)) =
let path = List.rev pfx in
f path hereset;
T_codom.iter (fun l tm -> apprec (l::pfx) tm) m
in
apprec [] tlm
end
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