35 lines
684 B
OCaml
35 lines
684 B
OCaml
open Ast
|
|
(* the type `environment` is defined in Ast *)
|
|
|
|
|
|
let new_lexical env =
|
|
let h = Hashtbl.create 16 in
|
|
h :: env
|
|
|
|
let set_local env s v =
|
|
match env with
|
|
| [] -> ()
|
|
| e1 :: _ -> Hashtbl.replace e1 s v
|
|
|
|
let rec update env s v =
|
|
match env with
|
|
| [] -> ()
|
|
| e1 :: erest ->
|
|
match Hashtbl.find_opt e1 s with
|
|
| None -> update erest s v
|
|
| Some _ -> Hashtbl.replace e1 s v
|
|
|
|
let rec get_root (env : environment) =
|
|
match env with
|
|
| [] -> raise (Invalid_argument "Empty environment passed to env_root!")
|
|
| e :: [] -> e
|
|
| _ :: t -> get_root t
|
|
|
|
let set_global env s v =
|
|
Hashtbl.replace (get_root env) s v
|
|
|
|
let copy env =
|
|
List.map Hashtbl.copy env
|
|
|
|
|