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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
Require Import Ltac2.Init.
Ltac2 Type t := pattern.
Ltac2 Type context.
Ltac2 Type 'a constr_match := [
| ConstrMatchPattern (pattern, constr array -> 'a)
| ConstrMatchContext (pattern, context -> constr array -> 'a)
].
Ltac2 @ external matches : t -> constr -> (ident * constr) list :=
"ltac2" "pattern_matches".
(** If the term matches the pattern, returns the bound variables. If it doesn't,
fail with [Match_failure]. Panics if not focussed. *)
Ltac2 @ external matches_subterm : t -> constr -> context * ((ident * constr) list) :=
"ltac2" "pattern_matches_subterm".
(** Returns a stream of results corresponding to all of the subterms of the term
that matches the pattern as in [matches]. The stream is encoded as a
backtracking value whose last exception is [Match_failure]. The additional
value compared to [matches] is the context of the match, to be filled with
the instantiate function. *)
Ltac2 @ external matches_vect : t -> constr -> constr array :=
"ltac2" "pattern_matches_vect".
(** Internal version of [matches] that does not return the identifiers. *)
Ltac2 @ external matches_subterm_vect : t -> constr -> context * constr array :=
"ltac2" "pattern_matches_subterm_vect".
(** Internal version of [matches_subterms] that does not return the identifiers. *)
Ltac2 @ external instantiate : context -> constr -> constr :=
"ltac2" "pattern_instantiate".
(** Fill the hole of a context with the given term. *)
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