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104 lines
3.7 KiB
OCaml
104 lines
3.7 KiB
OCaml
(* This file is part of the Catala compiler, a specification language for tax
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and social benefits computation rules. Copyright (C) 2020-2022 Inria,
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contributor: Louis Gesbert <louis.gesbert@inria.fr>
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License. *)
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open Definitions
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(** {1 Variables and their collections} *)
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(** This module provides types and helpers for Bindlib variables on the [gexpr]
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type *)
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type 'e t = ('a, 't) naked_gexpr Bindlib.var constraint 'e = ('a, 't) gexpr
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type 'e vars = ('a, 't) naked_gexpr Bindlib.mvar constraint 'e = ('a, 't) gexpr
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let make (name : string) : 'e t = Bindlib.new_var (fun x -> EVar x) name
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let compare = Bindlib.compare_vars
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let eq = Bindlib.eq_vars
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let translate (v : 'e1 t) : 'e2 t =
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Bindlib.copy_var v (fun x -> EVar x) (Bindlib.name_of v)
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type 'e var = 'e t
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(* The purpose of this module is just to lift a type parameter outside of
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[Set.S] and [Map.S], so that we can have ['e Var.Set.t] for sets of variables
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bound to the ['e = ('a, 't) gexpr] expression type. This is made possible by
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the fact that [Bindlib.compare_vars] is polymorphic in that parameter; we
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first hide that parameter inside an existential, then re-add a phantom type
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outside of the set to ensure consistency. Extracting the elements is then
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done with [Bindlib.copy_var] but technically it's not much different from an
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[Obj] conversion.
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If anyone has a better solution, besides a copy-paste of Set.Make / Map.Make
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code... *)
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module Generic = struct
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(* Existentially quantify the type parameters to allow application of
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Set.Make *)
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type t = Var : 'e var -> t
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(* Note: adding [[@@ocaml.unboxed]] would be OK and make our wrappers live at
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the type-level without affecting the actual data representation. But
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[Bindlib.var] being abstract, we can't convince OCaml it's ok at the moment
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and have to hold it *)
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let t v = Var v
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let get (Var v) = Bindlib.copy_var v (fun x -> EVar x) (Bindlib.name_of v)
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let compare (Var x) (Var y) = Bindlib.compare_vars x y
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let eq (Var x) (Var y) = Bindlib.eq_vars x y [@@ocaml.warning "-32"]
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end
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(* Wrapper around Set.Make to re-add type parameters (avoid inconsistent
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sets) *)
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module Set = struct
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open Generic
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open Set.Make (Generic)
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type nonrec 'e t = t
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let empty = empty
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let singleton x = singleton (t x)
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let add x s = add (t x) s
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let remove x s = remove (t x) s
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let union s1 s2 = union s1 s2
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let mem x s = mem (t x) s
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let of_list l = of_list (List.map t l)
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let elements s = elements s |> List.map get
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let diff s1 s2 = diff s1 s2
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(* Add more as needed *)
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end
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(* Wrapper around Map.Make to re-add type parameters (avoid inconsistent
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maps) *)
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module Map = struct
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open Generic
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open Map.Make (Generic)
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type nonrec ('e, 'x) t = 'x t
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let empty = empty
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let singleton v x = singleton (t v) x
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let add v x m = add (t v) x m
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let update v f m = update (t v) f m
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let find v m = find (t v) m
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let find_opt v m = find_opt (t v) m
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let bindings m = bindings m |> List.map (fun (v, x) -> get v, x)
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let mem x m = mem (t x) m
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let union f m1 m2 = union (fun v x1 x2 -> f (get v) x1 x2) m1 m2
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let fold f m acc = fold (fun v x acc -> f (get v) x acc) m acc
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(* Add more as needed *)
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end
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