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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 *)
(************************************************************************)
(* $Id:$ *)
(*i*)
open Term
open Sign
open Libnames
open Mod_subst
(*i*)
(* Dnets on constr terms.
An instantiation of Dnet on (an approximation of) constr. It
associates a term (possibly with Evar) with an
identifier. Identifiers must be unique (no two terms sharing the
same ident), and there must be a way to recover the full term from
the identifier (function constr_of).
Optionally, a pre-treatment on terms can be performed before adding
or searching (reduce). Practically, it is used to do some kind of
delta-reduction on terms before indexing them.
The results returned here are perfect, since post-filtering is done
inside here.
See lib/dnet.mli for more details.
*)
(* Identifiers to store (right hand side of the association) *)
module type IDENT = sig
type t
val compare : t -> t -> int
(* how to substitute them for storage *)
val subst : substitution -> t -> t
(* how to recover the term from the identifier *)
val constr_of : t -> constr
end
(* Options : *)
module type OPT = sig
(* pre-treatment to terms before adding or searching *)
val reduce : constr -> constr
(* direction of post-filtering w.r.t sort subtyping :
- true means query <= terms in the structure
- false means terms <= query
*)
val direction : bool
end
module type S =
sig
type t
type ident
(* results of filtering : identifier, a context (term with Evar
hole) and the substitution in that context*)
type result = ident * (constr*existential_key) * Termops.subst
val empty : t
(* [add c i dn] adds the binding [(c,i)] to [dn]. [c] can be a
closed term or a pattern (with untyped Evars). No Metas accepted *)
val add : constr -> ident -> t -> t
(* merge of dnets. Faster than re-adding all terms *)
val union : t -> t -> t
val subst : substitution -> t -> t
(*
* High-level primitives describing specific search problems
*)
(* [search_pattern dn c] returns all terms/patterns in dn
matching/matched by c *)
val search_pattern : t -> constr -> result list
(* [search_concl dn c] returns all matches under products and
letins, i.e. it finds subterms whose conclusion matches c. The
complexity depends only on c ! *)
val search_concl : t -> constr -> result list
(* [search_head_concl dn c] matches under products and applications
heads. Finds terms of the form [forall H_1...H_n, C t_1...t_n]
where C matches c *)
val search_head_concl : t -> constr -> result list
(* [search_eq_concl dn eq c] searches terms of the form [forall
H1...Hn, eq _ X1 X2] where either X1 or X2 matches c *)
val search_eq_concl : t -> constr -> constr -> result list
(* [find_all dn] returns all idents contained in dn *)
val find_all : t -> ident list
val map : (ident -> ident) -> t -> t
end
module Make :
functor (Ident : IDENT) ->
functor (Opt : OPT) ->
S with type ident = Ident.t
|
