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+(************************************************************************)
+(* v * The Coq Proof Assistant / The Coq Development Team *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(************************************************************************)
+
+(* $Id:$ *)
+
+(* Generic dnet implementation over non-recursive types *)
+
+module type Datatype =
+sig
+ type 'a t
+ val map : ('a -> 'b) -> 'a t -> 'b t
+ val map2 : ('a -> 'b -> 'c) -> 'a t -> 'b t -> 'c t
+ val fold : ('a -> 'b -> 'a) -> 'a -> 'b t -> 'a
+ val fold2 : ('a -> 'b -> 'c -> 'a) -> 'a -> 'b t -> 'c t -> 'a
+ val compare : unit t -> unit t -> int
+ val terminal : 'a t -> bool
+ val choose : ('a -> 'b) -> 'a t -> 'b
+end
+
+module type S =
+sig
+ type t
+ type ident
+ type meta
+ type 'a structure
+ module Idset : Set.S with type elt=ident
+ type 'a pattern =
+ | Term of 'a
+ | Meta of meta
+ type term_pattern = ('a structure) pattern as 'a
+ val empty : t
+ val add : t -> term_pattern -> ident -> t
+ val find_all : t -> Idset.t
+ val fold_pattern :
+ (meta -> t -> 'a -> 'a) -> 'a -> term_pattern -> t -> Idset.t option * 'a
+ val find_match : term_pattern -> t -> Idset.t
+ val inter : t -> t -> t
+ val union : t -> t -> t
+ val map : (ident -> ident) -> (unit structure -> unit structure) -> t -> t
+end
+
+module Make =
+ functor (T:Datatype) ->
+ functor (Ident:Set.OrderedType) ->
+ functor (Meta:Set.OrderedType) ->
+struct
+
+ type ident = Ident.t
+ type meta = Meta.t
+
+ type 'a pattern =
+ | Term of 'a
+ | Meta of meta
+
+ type 'a structure = 'a T.t
+
+ module Idset = Set.Make(Ident)
+ module Mmap = Map.Make(Meta)
+ module Tmap = Map.Make(struct type t = unit structure
+ let compare = T.compare end)
+
+ type term_pattern = term_pattern structure pattern
+ type idset = Idset.t
+
+
+
+ (* we store identifiers at the leaf of the dnet *)
+ type node =
+ | Node of t structure
+ | Terminal of t structure * idset
+
+ (* at each node, we have a bunch of nodes (actually a map between
+ the bare node and a subnet) and a bunch of metavariables *)
+ and t = Nodes of node Tmap.t * idset Mmap.t
+
+ let empty : t = Nodes (Tmap.empty, Mmap.empty)
+
+ (* the head of a data is of type unit structure *)
+ let head w = T.map (fun c -> ()) w
+
+ (* given a node of the net and a word, returns the subnet with the
+ same head as the word (with the rest of the nodes) *)
+ let split l (w:'a structure) : node * node Tmap.t =
+ let elt : node = Tmap.find (head w) l in
+ (elt, Tmap.remove (head w) l)
+
+ let select l w = Tmap.find (head w) l
+
+ let rec add (Nodes (t,m):t) (w:term_pattern) (id:ident) : t =
+ match w with Term w ->
+ ( try
+ let (n,tl) = split t w in
+ let new_node = match n with
+ | Terminal (e,is) -> Terminal (e,Idset.add id is)
+ | Node e -> Node (T.map2 (fun t p -> add t p id) e w) in
+ Nodes ((Tmap.add (head w) new_node tl), m)
+ with Not_found ->
+ let new_content = T.map (fun p -> add empty p id) w in
+ let new_node =
+ if T.terminal w then
+ Terminal (new_content, Idset.singleton id)
+ else Node new_content in
+ Nodes ((Tmap.add (head w) new_node t), m) )
+ | Meta i ->
+ let m =
+ try Mmap.add i (Idset.add id (Mmap.find i m)) m
+ with Not_found -> Mmap.add i (Idset.singleton id) m in
+ Nodes (t, m)
+
+ let add t w id = add t w id
+
+ let rec find_all (Nodes (t,m)) : idset =
+ Idset.union
+ (Mmap.fold (fun _ -> Idset.union) m Idset.empty)
+ (Tmap.fold
+ ( fun _ n acc ->
+ let s2 = match n with
+ | Terminal (_,is) -> is
+ | Node e -> T.choose find_all e in
+ Idset.union acc s2
+ ) t Idset.empty)
+
+ exception Empty
+
+ (* optimization hack: Not_found is catched in fold_pattern *)
+ let fast_inter s1 s2 =
+ if Idset.is_empty s1 || Idset.is_empty s2 then raise Empty
+ else Idset.inter s1 s2
+
+ let option_any2 f s1 s2 = match s1,s2 with
+ | Some s1, Some s2 -> f s1 s2
+ | (Some s, _ | _, Some s) -> s
+ | _ -> raise Not_found
+
+ let fold_pattern ?(complete=true) f acc pat dn =
+ let deferred = ref [] in
+ let leafs,metas = ref None, ref None in
+ let leaf s = leafs := match !leafs with
+ | None -> Some s
+ | Some s' -> Some (fast_inter s s') in
+ let meta s = metas := match !metas with
+ | None -> Some s
+ | Some s' -> Some (Idset.union s s') in
+ let defer c = deferred := c::!deferred in
+ let rec fp_rec (p:term_pattern) (Nodes(t,m) as dn:t) =
+ Mmap.iter (fun _ -> meta) m; (* TODO: gérer patterns nonlin ici *)
+ match p with
+ | Meta m -> defer (m,dn)
+ | Term w ->
+ try match select t w with
+ | Terminal (_,is) -> leaf is
+ | Node e ->
+ if complete then T.fold2 (fun _ -> fp_rec) () w e else
+ if T.fold2
+ (fun b p dn -> match p with
+ | Term _ -> fp_rec p dn; false
+ | Meta _ -> b
+ ) true w e
+ then T.choose (T.choose fp_rec w) e
+ with Not_found ->
+ if Mmap.is_empty m then raise Not_found else ()
+ in try
+ fp_rec pat dn;
+ (try Some (option_any2 Idset.union !leafs !metas) with Not_found -> None),
+ List.fold_left (fun acc (m,dn) -> f m dn acc) acc !deferred
+ with Not_found | Empty -> None,acc
+
+ (* intersection of two dnets. keep only the common pairs *)
+ let rec inter (t1:t) (t2:t) : t =
+ let inter_map f (Nodes (t1,m1):t) (Nodes (t2,m2):t) : t =
+ Nodes
+ (Tmap.fold
+ ( fun k e acc ->
+ try Tmap.add k (f e (Tmap.find k t2)) acc
+ with Not_found -> acc
+ ) t1 Tmap.empty,
+ Mmap.fold
+ ( fun m s acc ->
+ try Mmap.add m (Idset.inter s (Mmap.find m m2)) acc
+ with Not_found -> acc
+ ) m1 Mmap.empty
+ ) in
+ inter_map
+ (fun n1 n2 -> match n1,n2 with
+ | Terminal (e1,s1), Terminal (_,s2) -> Terminal (e1,Idset.inter s1 s2)
+ | Node e1, Node e2 -> Node (T.map2 inter e1 e2)
+ | _ -> assert false
+ ) t1 t2
+
+ let rec union (t1:t) (t2:t) : t =
+ let union_map f (Nodes (t1,m1):t) (Nodes (t2,m2):t) : t =
+ Nodes
+ (Tmap.fold
+ ( fun k e acc ->
+ try Tmap.add k (f e (Tmap.find k acc)) acc
+ with Not_found -> Tmap.add k e acc
+ ) t1 t2,
+ Mmap.fold
+ ( fun m s acc ->
+ try Mmap.add m (Idset.inter s (Mmap.find m acc)) acc
+ with Not_found -> Mmap.add m s acc
+ ) m1 m2
+ ) in
+ union_map
+ (fun n1 n2 -> match n1,n2 with
+ | Terminal (e1,s1), Terminal (_,s2) -> Terminal (e1,Idset.union s1 s2)
+ | Node e1, Node e2 -> Node (T.map2 union e1 e2)
+ | _ -> assert false
+ ) t1 t2
+
+ let find_match (p:term_pattern) (t:t) : idset =
+ let metas = ref Mmap.empty in
+ let (mset,lset) = fold_pattern ~complete:false
+ (fun m t acc ->
+(* Printf.printf "eval pat %d\n" (Obj.magic m:int);*)
+ Some (option_any2 fast_inter acc
+ (Some(let t = try inter t (Mmap.find m !metas) with Not_found -> t in
+ metas := Mmap.add m t !metas;
+ find_all t)))
+ ) None p t in
+ try option_any2 Idset.inter mset lset
+ with Not_found -> Idset.empty
+
+ let fold_pattern f acc p dn = fold_pattern ~complete:true f acc p dn
+
+ let idset_map f is = Idset.fold (fun e acc -> Idset.add (f e) acc) is Idset.empty
+ let tmap_map f g m = Tmap.fold (fun k e acc -> Tmap.add (f k) (g e) acc) m Tmap.empty
+
+ let rec map sidset sterm (Nodes (t,m)) : t =
+ let snode = function
+ | Terminal (e,is) -> Terminal (e,idset_map sidset is)
+ | Node e -> Node (T.map (map sidset sterm) e) in
+ Nodes (tmap_map sterm snode t, Mmap.map (idset_map sidset) m)
+
+end
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