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ast_external.ml
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(* Copyright (C) 2018 Hongbo Zhang, Authors of ReScript
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* In addition to the permissions granted to you by the LGPL, you may combine
* or link a "work that uses the Library" with a publicly distributed version
* of this file to produce a combined library or application, then distribute
* that combined work under the terms of your choosing, with no requirement
* to comply with the obligations normally placed on you by section 4 of the
* LGPL version 3 (or the corresponding section of a later version of the LGPL
* should you choose to use a 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. *)
let handleExternalInSig (self : Bs_ast_mapper.mapper)
(prim : Parsetree.value_description) (sigi : Parsetree.signature_item) :
Parsetree.signature_item =
let loc = prim.pval_loc in
let pval_type = self.typ self prim.pval_type in
let pval_attributes = self.attributes self prim.pval_attributes in
match Ast_attributes.process_send_pipe pval_attributes with
| Some (obj, _) ->
(*has bs.send.pipe: best effort *)
{
sigi with
psig_desc =
Psig_value
{
prim with
pval_type = Ast_core_type.add_last_obj pval_type obj;
pval_prim = [];
pval_attributes = [];
};
}
| None -> (
match prim.pval_prim with
| [] -> Location.raise_errorf ~loc "empty primitive string"
| a :: b :: _ ->
Location.raise_errorf ~loc
"only a single string is allowed in bs external %S %S" a b
| [ v ] -> (
match
Ast_external_process.encode_attributes_as_string loc pval_type
pval_attributes v
with
| { pval_type; pval_prim; pval_attributes; no_inline_cross_module } ->
{
sigi with
psig_desc =
Psig_value
{
prim with
pval_type;
pval_prim =
(if no_inline_cross_module then [] else pval_prim);
pval_attributes;
};
}))
let handleExternalInStru (self : Bs_ast_mapper.mapper)
(prim : Parsetree.value_description) (str : Parsetree.structure_item) :
Parsetree.structure_item =
let loc = prim.pval_loc in
let pval_type = self.typ self prim.pval_type in
let pval_attributes = self.attributes self prim.pval_attributes in
let send_pipe = ref false in
let pval_type, pval_attributes =
match Ast_attributes.process_send_pipe pval_attributes with
| Some (obj, attrs) ->
send_pipe := true;
(Ast_helper.Typ.arrow ~loc Nolabel obj pval_type, attrs)
| None -> (pval_type, pval_attributes)
in
match prim.pval_prim with
| [] -> Location.raise_errorf ~loc "empty primitive string"
| a :: b :: _ ->
Location.raise_errorf ~loc
"only a single string is allowed in bs external %S : %S" a b
| [ v ] -> (
match
Ast_external_process.encode_attributes_as_string loc pval_type
pval_attributes v
with
| { pval_type; pval_prim; pval_attributes; no_inline_cross_module } ->
let external_result =
{
str with
pstr_desc =
Pstr_primitive
{ prim with pval_type; pval_prim; pval_attributes };
}
in
let normal () =
if not no_inline_cross_module then external_result
else
let open Ast_helper in
Str.include_ ~loc
(Incl.mk ~loc
(Mod.constraint_ ~loc
(Mod.structure ~loc [ external_result ])
(Mty.signature ~loc
[
{
psig_desc =
Psig_value
{
prim with
pval_type;
pval_prim = [];
pval_attributes;
};
psig_loc = loc;
};
])))
in
if !send_pipe then
let[@warning "-8"] (_ :: params as args) =
Ast_core_type.get_curry_labels pval_type
in
let arity = List.length args in
if arity = 1 then normal ()
else
let open Ast_helper in
Str.include_ ~loc
(Incl.mk ~loc
(Mod.structure ~loc
[
external_result;
Str.value ~loc Nonrecursive
[
Vb.mk ~loc
(Pat.var ~loc prim.pval_name)
(let body =
Exp.apply ~loc
(Exp.ident ~loc
{ txt = Lident prim.pval_name.txt; loc })
(( Asttypes.Nolabel,
Exp.ident ~loc { txt = Lident "obj"; loc }
)
:: Ext_list.mapi params (fun i x ->
( x,
match x with
| Asttypes.Nolabel ->
Exp.ident
{
txt =
Lident
("arg"
^ string_of_int (i + 1)
);
loc;
}
| Labelled s | Optional s ->
Exp.ident
{ txt = Lident s; loc } )))
in
snd
@@ Ext_list.fold_right params
( 0,
Exp.fun_ Nolabel None
(Pat.var ~loc { txt = "obj"; loc })
body )
(fun arg (i, obj) ->
( i + 1,
Exp.fun_ arg None
(Pat.var ~loc
{
txt =
(match arg with
| Labelled s | Optional s -> s
| Nolabel ->
"arg"
^ string_of_int
(arity - i - 1));
loc;
})
obj )));
];
]))
else normal ())