32 lines
1.5 KiB
OCaml
32 lines
1.5 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 = Bytes.of_string "num"; body = Bytes.of_string (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 -> Arr ((Hint {hint = Bytes.of_string "obj"; body = Bytes.empty}) ::
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(List.map (fun (k, v) -> Arr [str k; sexp_of_json v]) kvs))
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| Json.Flg f -> Hint {hint = (Bytes.of_string "bool"); body = (Bytes.of_string (string_of_bool f))}
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| Json.Nil -> Hint {hint = (Bytes.of_string "null"); body = Bytes.empty}
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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 = hint; body = n} when hint = Bytes.of_string "num" ->
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Json.Num (float_of_string (Bytes.to_string n))
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| Str s -> Json.Str (Bytes.to_string s)
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| Arr ((Hint {hint = hint; body = bs}) :: kvs) when hint = Bytes.of_string "obj" && bs = Bytes.empty ->
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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] -> (Bytes.to_string k, walk v)
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| _ -> raise (Syntax_error "Bad JSON-SEXP key-value")))
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kvs)
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| Arr xs -> Json.Arr (List.map walk xs)
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| Hint {hint = hint; body = bs} when hint = Bytes.of_string "bool" -> Json.Flg (bool_of_string (Bytes.to_string bs))
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| Hint {hint = hint; body = bs} when hint = Bytes.of_string "null" && bs = Bytes.empty -> Json.Nil
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| Hint {hint = h; body = b} -> Json.Rec ["_hint", Json.Str (Bytes.to_string h); "_body", Json.Str (Bytes.to_string b)]
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in
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Lwt.wrap1 walk x
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