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(*
Copyright © 2011 MLstate
This file is part of OPA.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*)
(**
Management of imperative scope
@author Vincent Benayoun
*)
module type IMPERATIVE_SCOPE =
sig
(**
The mutable type of the instance
*)
type 'a t
type elt
(** create a new structure given a size for blocks *)
val create : int -> 'a t
(** reset the structure to its initial state *)
val reset : 'a t -> unit
(** push a new block *)
val push : 'a t -> unit
(** pop the top block *)
val pop : 'a t -> unit
(** fold the top block *)
val fold : (elt -> 'a -> 'acc -> 'acc) -> 'a t -> 'acc -> 'acc
(** bind the elt to 'a in the top block *)
val bind : 'a t -> elt -> 'a -> unit
(** unbind the elt from the top block *)
val unbind : 'a t -> elt -> unit
(** find the first binded data to the elt (top down) *)
val find_opt : 'a t -> elt -> 'a option
end
module type ARG =
sig
type elt
type 'a block
val create : int -> 'a block
val fold : (elt -> 'a -> 'acc -> 'acc) -> 'a block -> 'acc -> 'acc
val bind : 'a block -> elt -> 'a -> unit
val unbind : 'a block -> elt -> unit
val find_opt: 'a block -> elt -> 'a option
end
module Make(Arg : ARG) : IMPERATIVE_SCOPE with type elt = Arg.elt =
struct
type 'a t = 'a Arg.block list ref
type elt = Arg.elt
let block_size = ref 0
let new_stack() = [Arg.create !block_size]
let create n = block_size := n; ref (new_stack())
let reset s = s := new_stack()
let push s = s := (Arg.create !block_size)::!s
let pop s =
match !s with
| [_] -> s := new_stack()
| _ -> s := List.tl !s
let fold f s = Arg.fold f (List.hd !s)
let bind s e v = Arg.bind (List.hd !s) e v
let unbind s e = Arg.unbind (List.hd !s) e
let rec find_opt s e =
let rec aux l =
match l with
| [] -> None
| hd::tl ->
let found = Arg.find_opt hd e in
match found with
| Some _ -> found
| None -> aux tl
in
aux !s
end
module Default (Arg : sig type elt end) = Make(
struct
type elt = Arg.elt
type 'a block = (elt, 'a) Hashtbl.t
let create n = Hashtbl.create n
let fold f = Hashtbl.fold f
let bind b e v = Hashtbl.add b e v
let unbind b e = Hashtbl.remove b e
let find_opt b e =
try
Some (Hashtbl.find b e)
with
| Not_found -> None
end
)
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