70 lines
1.4 KiB
OCaml
70 lines
1.4 KiB
OCaml
type t = {
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vars : (string, value) Hashtbl.t;
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parent : t option;
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}
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and value =
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| Int of int
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| Float of float
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| String of string
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| Function of string list * expr
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| External of string
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| Nop (* return of system operations (will be deprecated) *)
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and expr = Ast.t
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module Value = struct
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module Type = Ast.Type
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type t = value
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let to_string = function
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| Int n -> string_of_int n
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| Float n -> string_of_float n
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| String s -> "\"" ^ s ^ "\""
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| Function (vars, _) ->
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Printf.sprintf "function with %d arguments" @@ List.length vars
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| External f -> "external " ^ f
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| Nop -> "nop"
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let typeof = function
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| Int _ -> Type.Int
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| Float _ -> Type.Float
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| String _ -> Type.String
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| Function _ -> Type.Function
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| External _ -> Type.External
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| Nop -> failwith "Value.typeof"
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let promote = function
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| Int n -> Float (float n)
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| _ -> failwith "Value.promote"
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end
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let init_global () = {
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vars = Hashtbl.create 100;
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parent = None;
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}
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let make parent = {
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vars = Hashtbl.create 100;
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parent = Some parent;
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}
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exception Not_found
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let rec get e name =
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match Hashtbl.find_opt e.vars name with
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| None -> begin match e.parent with
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| None -> raise Not_found
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| Some p -> get p name
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end
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| Some value -> value
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let get_opt e name =
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try Some (get e name)
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with Not_found -> None
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let set e name value =
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Hashtbl.replace e.vars name value
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let add_seq e seq =
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Hashtbl.add_seq e.vars seq
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