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