53 lines
1.0 KiB
OCaml
53 lines
1.0 KiB
OCaml
type vtable = {
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n_slots : int;
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elems : (string, elem) Hashtbl.t;
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}
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and slotidx = int
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and elem =
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| Field of slotidx
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| Method (* of callable *)
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let make_vtable fields =
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{
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n_slots = List.length fields;
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elems = List.to_seq fields |> Seq.mapi (fun i name -> name, Field i) |> Hashtbl.of_seq;
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}
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type t =
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| Nil
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| True
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| False
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| Int of int64
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| Obj of vtable * t array
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let make_obj vtable = Obj (vtable, Array.make vtable.n_slots Nil)
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let bool = function
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| true -> True
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| false -> False
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let rec pp ppf = function
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| Obj (vtable, slots) -> pp_obj ppf vtable slots
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| Int n -> Fmt.string ppf (Int64.to_string n)
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| v -> Fmt.pf ppf "%S" (to_string v)
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and to_string = function
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| Nil -> "nil"
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| True -> "true"
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| False -> "false"
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| v -> Fmt.str "%a" pp v
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and pp_obj ppf vtable slots =
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Fmt.pf ppf "{";
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let sep = ref "" in
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Hashtbl.iter
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(fun name -> function
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| Method -> ()
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| Field idx ->
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Fmt.pf ppf "%s%S:%a" !sep name pp slots.(idx);
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sep := ",")
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vtable.elems;
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Fmt.pf ppf "}"
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