31 lines
1.1 KiB
OCaml
31 lines
1.1 KiB
OCaml
open Sexp
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let rec sexp_of_json j =
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match j with
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| Json.Num f -> Hint {hint = Str "num"; body = Str (Json.to_string j)}
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| Json.Str s -> Str s
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| Json.Arr js -> Arr (List.map sexp_of_json js)
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| Json.Rec kvs -> Hint {hint = Str "obj";
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body = Arr (List.map (fun (k, v) -> Arr [Str k; sexp_of_json v]) kvs)}
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| Json.Flg f -> Hint {hint = Str "bool"; body = Str (string_of_bool f)}
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| Json.Nil -> Hint {hint = Str "null"; body = Arr []}
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let json_of_sexp x =
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let rec walk x =
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match x with
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| Hint {hint = Str "num"; body = Str n} -> Json.Num (float_of_string n)
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| Str s -> Json.Str s
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| Arr xs -> Json.Arr (List.map walk xs)
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| Hint {hint = Str "obj"; body = Arr kvs} ->
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Json.Rec (List.map
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(fun kv ->
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(match kv with
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| Arr [Str k; v] -> (k, walk v)
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| _ -> raise (Syntax_error "Bad JSON-SEXP key-value")))
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kvs)
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| Hint {hint = Str "bool"; body = Str bs} -> Json.Flg (bool_of_string bs)
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| Hint {hint = Str "null"; body = Arr []} -> Json.Nil
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| Hint {hint = h; body = b} -> Json.Rec ["_hint", walk h; "_body", walk b]
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in
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Lwt.wrap1 walk x
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