Source file `attributes.ml`

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(*
 * 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.
 *)

open Ppxlib

let namespace = "irmin"

let generic =
  Attribute.declare
    (String.concat "." [ namespace; "generic" ])
    Attribute.Context.Core_type
    Ast_pattern.(single_expr_payload __)
    (fun e -> e)

let nobuiltin =
  Attribute.declare
    (String.concat "." [ 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 generic; T nobuiltin ]