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|
(* Js_of_ocaml compiler
* http://www.ocsigen.org/js_of_ocaml/
* Copyright (C) 2019 Ty Overby, Jane Street Group LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, with linking exception;
* either version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*)
open! Stdlib
type m =
| Replace
| Count of int ref
class macro_mapper ~flags =
object (m)
inherit Js_traverse.map as super
method expression x =
let module J = Javascript in
match x with
| J.ECall (J.EVar (J.S { name = Utf8 name; _ }), (ANormal | ANullish), args, _) -> (
match name, args with
| "FLAG", [ J.Arg (J.EStr (Utf8 s)) ] -> (
match flags with
| Replace ->
let i = if Config.Flag.find s then Targetint.one else Targetint.zero in
J.ENum (J.Num.of_targetint i)
| Count count ->
incr count;
super#expression x)
| "BLOCK", J.Arg (J.ENum tag) :: (_ :: _ as args)
when List.for_all args ~f:(function
| J.Arg _ -> true
| J.ArgSpread _ -> false) ->
let tag = Targetint.to_int_exn (J.Num.to_targetint tag) in
let args =
List.map args ~f:(function
| J.Arg e -> J.Element (m#expression e)
| J.ArgSpread _ -> assert false)
in
Mlvalue.Block.make ~tag ~args
| "TAG", [ J.Arg e ] -> Mlvalue.Block.tag (m#expression e)
| "LENGTH", [ J.Arg e ] -> Mlvalue.Array.length (m#expression e)
| "FIELD", [ J.Arg e; J.Arg (J.ENum n) ] ->
let idx = Targetint.to_int_exn (J.Num.to_targetint n) in
Mlvalue.Block.field (m#expression e) idx
| "FIELD", [ _; J.Arg (J.EUn (J.Neg, _)) ] ->
failwith "Negative field indexes are not allowed"
| "ISBLOCK", [ J.Arg e ] -> Mlvalue.is_block (m#expression e)
| (("BLOCK" | "TAG" | "LENGTH" | "FIELD" | "ISBLOCK" | "FLAG") as name), _ ->
failwith
(Format.sprintf "macro %s called with inappropriate arguments" name)
| _ -> super#expression x)
| _ -> super#expression x
end
let f ~flags js =
let count = ref 0 in
let flags =
match flags with
| true -> Replace
| false -> Count count
in
let trav = new macro_mapper ~flags in
let js = trav#program js in
js, !count > 0
|
