catala/compiler/plugin.ml
Louis Gesbert 467a338b6c Install Catala plugins
Fixes #378

- the plugins are compiled as libraries rather than with `executable`, so that
  dune is able to install them
- they get installed to `lib/catala/plugins/<plugin-name>/<plugin-name>.cmxs`
- the lookup for plugins is now recursive to cope with the plugin subdirectories
  in the point above
2023-01-17 14:38:09 +01:00

74 lines
2.2 KiB
OCaml

(* This file is part of the Catala compiler, a specification language for tax
and social benefits computation rules. Copyright (C) 2022 Inria, OCamlPro;
contributors: Louis Gesbert <louis.gesbert@ocamlpro.com>
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License. *)
open Catala_utils
type 'ast plugin_apply_fun_typ =
source_file:Pos.input_file ->
output_file:string option ->
scope:string option ->
'ast ->
Scopelang.Dependency.TVertex.t list ->
unit
type 'ast gen = {
name : string;
extension : string;
apply : 'ast plugin_apply_fun_typ;
}
type t =
| Lcalc of Shared_ast.untyped Lcalc.Ast.program gen
| Scalc of Scalc.Ast.program gen
let name = function Lcalc { name; _ } | Scalc { name; _ } -> name
let backend_plugins : (string, t) Hashtbl.t = Hashtbl.create 17
let register t =
Hashtbl.replace backend_plugins (String.lowercase_ascii (name t)) t
module PluginAPI = struct
let register_lcalc ~name ~extension apply =
register (Lcalc { name; extension; apply })
let register_scalc ~name ~extension apply =
register (Scalc { name; extension; apply })
end
let find name = Hashtbl.find backend_plugins (String.lowercase_ascii name)
let load_file f =
try
Dynlink.loadfile f;
Cli.debug_print "Plugin %S loaded" f
with e ->
Errors.format_warning "Could not load plugin %S: %s" f
(Printexc.to_string e)
let rec load_dir d =
let dynlink_exts =
if Dynlink.is_native then [".cmxs"] else [".cmo"; ".cma"]
in
Array.iter
(fun f ->
if f.[0] = '.' then ()
else
let f = Filename.concat d f in
if Sys.is_directory f then load_dir f
else if List.exists (Filename.check_suffix f) dynlink_exts then
load_file f)
(Sys.readdir d)