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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: termdn.ml 7639 2005-12-02 10:01:15Z gregoire $ *)
open Util
open Names
open Nameops
open Term
open Pattern
open Rawterm
open Libnames
open Nametab
(* Discrimination nets of terms.
See the module dn.ml for further explanations.
Eduardo (5/8/97) *)
type 'a t = (global_reference,constr_pattern,'a) Dn.t
(*If we have: f a b c ..., decomp gives: (f,[a;b;c;...])*)
let decomp =
let rec decrec acc c = match kind_of_term c with
| App (f,l) -> decrec (Array.fold_right (fun a l -> a::l) l acc) f
| Cast (c1,_,_) -> decrec acc c1
| _ -> (c,acc)
in
decrec []
let decomp_pat =
let rec decrec acc = function
| PApp (f,args) -> decrec (Array.to_list args @ acc) f
| c -> (c,acc)
in
decrec []
let constr_pat_discr t =
if not (occur_meta_pattern t) then
None
else
match decomp_pat t with
| PRef ((IndRef _) as ref), args
| PRef ((ConstructRef _ ) as ref), args
| PRef ((VarRef _) as ref), args -> Some(ref,args)
| _ -> None
let constr_val_discr t =
let c, l = decomp t in
match kind_of_term c with
(* Const _,_) -> Some(TERM c,l) *)
| Ind ind_sp -> Some(IndRef ind_sp,l)
| Construct cstr_sp -> Some(ConstructRef cstr_sp,l)
| Var id -> Some(VarRef id,l)
| _ -> None
(* Les deux fonctions suivantes ecrasaient les precedentes,
ajout d'un suffixe _nil CP 16/08 *)
let constr_pat_discr_nil t =
match constr_pat_discr t with
| None -> None
| Some (c,_) -> Some(c,[])
let constr_val_discr_nil t =
match constr_val_discr t with
| None -> None
| Some (c,_) -> Some(c,[])
let create = Dn.create
let add dn = Dn.add dn constr_pat_discr
let rmv dn = Dn.rmv dn constr_pat_discr
let lookup dn t = Dn.lookup dn constr_val_discr t
let app f dn = Dn.app f dn
|
