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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2019 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
open CAst
type ('a, _) thunk =
| Value : 'a -> ('a, 'b) thunk
| Thunk : 'a Lazy.t -> ('a, [ `thunk ]) thunk
type ('a, 'b) t = ('a, 'b) thunk CAst.t
let map_thunk (type s) f : (_, s) thunk -> (_, s) thunk = function
| Value x -> Value (f x)
| Thunk k -> Thunk (lazy (f (Lazy.force k)))
let get_thunk (type s) : ('a, s) thunk -> 'a = function
| Value x -> x
| Thunk k -> Lazy.force k
let get x = get_thunk x.v
let make ?loc v = CAst.make ?loc (Value v)
let delay ?loc v = CAst.make ?loc (Thunk (Lazy.from_fun v))
let force x = CAst.make ?loc:x.CAst.loc (Value (get_thunk x.v))
let map f n = CAst.map (fun x -> map_thunk f x) n
let map_with_loc f n =
CAst.map_with_loc (fun ?loc x -> map_thunk (fun x -> f ?loc x) x) n
let map_from_loc f (loc, x) =
make ?loc (f ?loc x)
let with_val f n = f (get n)
let with_loc_val f n = f ?loc:n.CAst.loc (get n)