Source file attributes.ml

(*
 * Copyright (c) 2019-2020 Craig Ferguson <me@craigfe.io>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *)

include Attributes_intf
open Ppxlib

module Make (T : sig
  val namespace : string
end) =
struct
  let repr =
    Attribute.declare
      (String.concat "." [ T.namespace; "repr" ])
      Attribute.Context.Core_type
      Ast_pattern.(single_expr_payload __)
      (fun e -> e)

  let nobuiltin =
    Attribute.declare
      (String.concat "." [ T.namespace; "nobuiltin" ])
      Attribute.Context.Core_type
      Ast_pattern.(pstr __')
      (fun s ->
        match s with
        | { txt = _ :: _; loc } ->
            Location.raise_errorf ~loc "`nobuiltin` payload must be empty"
        | { txt = []; _ } -> ())

  let all = Attribute.[ T repr; T nobuiltin ]
end