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ast_external_process.ml
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(* Copyright (C) 2015 - 2016 Bloomberg Finance L.P.
* Copyright (C) 2017 - 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. *)
[@@@warning "+9"]
(* record pattern match complete checker*)
let rec variant_can_unwrap_aux (row_fields : Parsetree.row_field list) : bool =
match row_fields with
| [] -> true
| Rtag (_, _, false, [_]) :: rest -> variant_can_unwrap_aux rest
| _ :: _ -> false
let variant_unwrap (row_fields : Parsetree.row_field list) : bool =
match row_fields with
| [] -> false (* impossible syntax *)
| xs -> variant_can_unwrap_aux xs
(*
TODO: [nolabel] is only used once turn Nothing into Unit, refactor later
*)
let spec_of_ptyp (nolabel : bool) (ptyp : Parsetree.core_type) :
External_arg_spec.attr =
let ptyp_desc = ptyp.ptyp_desc in
match
Ast_attributes.iter_process_bs_string_int_unwrap_uncurry
ptyp.ptyp_attributes
with
| `String -> (
match ptyp_desc with
| Ptyp_variant (row_fields, Closed, None) ->
Ast_polyvar.map_row_fields_into_strings ptyp.ptyp_loc row_fields
| _ -> Bs_syntaxerr.err ptyp.ptyp_loc Invalid_bs_string_type)
| `Ignore -> Ignore
| `Int -> (
match ptyp_desc with
| Ptyp_variant (row_fields, Closed, None) ->
let int_lists =
Ast_polyvar.map_row_fields_into_ints ptyp.ptyp_loc row_fields
in
Int int_lists
| _ -> Bs_syntaxerr.err ptyp.ptyp_loc Invalid_bs_int_type)
| `Unwrap -> (
match ptyp_desc with
| Ptyp_variant (row_fields, Closed, _) when variant_unwrap row_fields ->
Unwrap
(* Unwrap attribute can only be attached to things like `[a of a0 | b of b0]` *)
| _ -> Bs_syntaxerr.err ptyp.ptyp_loc Invalid_bs_unwrap_type)
| `Nothing -> (
match ptyp_desc with
| Ptyp_constr ({txt = Lident "unit"; _}, []) ->
if nolabel then Extern_unit else Nothing
| _ -> Nothing)
(* is_optional = false
*)
let refine_arg_type ~(nolabel : bool) (ptyp : Ast_core_type.t) :
External_arg_spec.attr =
if ptyp.ptyp_desc = Ptyp_any then
let ptyp_attrs = ptyp.ptyp_attributes in
let payload = Ast_attributes.iter_process_bs_string_or_int_as ptyp_attrs in
match payload with
| None -> spec_of_ptyp nolabel ptyp
| Some cst -> (
(* (_[@as ])*)
(* when ppx start dropping attributes
we should warn, there is a trade off whether
we should warn dropped non bs attribute or not
*)
Bs_ast_invariant.warn_discarded_unused_attributes ptyp_attrs;
match cst with
| Int i ->
(* This type is used in obj only to construct obj type*)
Arg_cst (External_arg_spec.cst_int i)
| Str (i, delim) -> Arg_cst (External_arg_spec.cst_string i delim))
else (* ([`a|`b] [@string]) *)
spec_of_ptyp nolabel ptyp
let refine_obj_arg_type ~(nolabel : bool) (ptyp : Ast_core_type.t) :
External_arg_spec.attr =
if ptyp.ptyp_desc = Ptyp_any then (
let ptyp_attrs = ptyp.ptyp_attributes in
let payload = Ast_attributes.iter_process_bs_string_or_int_as ptyp_attrs in
(* when ppx start dropping attributes
we should warn, there is a trade off whether
we should warn dropped non bs attribute or not
*)
Bs_ast_invariant.warn_discarded_unused_attributes ptyp_attrs;
match payload with
| None -> Bs_syntaxerr.err ptyp.ptyp_loc Invalid_underscore_type_in_external
| Some (Int i) ->
(* @as(24) *)
(* This type is used in obj only to construct obj type *)
Arg_cst (External_arg_spec.cst_int i)
| Some (Str (s, delim)) ->
(* @as("foo") *)
Arg_cst (External_arg_spec.cst_string s delim))
else (* ([`a|`b] [@string]) *)
spec_of_ptyp nolabel ptyp
(** Given the type of argument, process its [bs.] attribute and new type,
The new type is currently used to reconstruct the external type
and result type in [@@obj]
They are not the same though, for example
{[
external f : hi:([ `hi | `lo ] [@string]) -> unit -> _ = "" [@@obj]
]}
The result type would be [ hi:string ]
*)
let get_opt_arg_type ~(nolabel : bool) (ptyp : Ast_core_type.t) :
External_arg_spec.attr =
if ptyp.ptyp_desc = Ptyp_any then
(* (_[@as ])*)
(* extenral f : ?x:_ -> y:int -> _ = "" [@@obj] is not allowed *)
Bs_syntaxerr.err ptyp.ptyp_loc Invalid_underscore_type_in_external;
(* ([`a|`b] [@@string]) *)
spec_of_ptyp nolabel ptyp
(**
[@@module "react"]
[@@module "react"]
---
[@@module "@" "react"]
[@@module "@" "react"]
They should have the same module name
TODO: we should emit an warning if we bind
two external files to the same module name
*)
type source = Payload | External
type bundle_source = {name: string; source: source}
type external_desc = {
val_name: bundle_source option;
external_module_name: External_ffi_types.external_module_name option;
module_as_val: External_ffi_types.external_module_name option;
val_send: bundle_source option;
splice: bool;
(* mutable *)
scopes: string list;
set_index: bool;
(* mutable *)
get_index: bool;
new_name: bundle_source option;
call_name: bundle_source option;
set_name: bundle_source option;
get_name: bundle_source option;
mk_obj: bool;
return_wrapper: External_ffi_types.return_wrapper;
tagged_template: bool;
}
let init_st =
{
val_name = None;
external_module_name = None;
module_as_val = None;
val_send = None;
splice = false;
scopes = [];
set_index = false;
get_index = false;
new_name = None;
call_name = None;
set_name = None;
get_name = None;
mk_obj = false;
return_wrapper = Return_unset;
tagged_template = false;
}
let return_wrapper loc (txt : string) : External_ffi_types.return_wrapper =
match txt with
| "undefined_to_opt" -> Return_undefined_to_opt
| "null_to_opt" -> Return_null_to_opt
| "nullable" | "null_undefined_to_opt" -> Return_null_undefined_to_opt
| "identity" -> Return_identity
| _ -> Bs_syntaxerr.err loc Not_supported_directive_in_bs_return
exception Not_handled_external_attribute
(* The processed attributes will be dropped *)
let parse_external_attributes (no_arguments : bool) (prim_name_check : string)
(prim_name_or_pval_prim : bundle_source)
(prim_attributes : Ast_attributes.t) : Ast_attributes.t * external_desc =
(* shared by `[@@val]`, `[@@send]`,
`[@@set]`, `[@@get]` , `[@@new]`
*)
let name_from_payload_or_prim ~loc (payload : Parsetree.payload) :
bundle_source =
match payload with
| PStr [] -> prim_name_or_pval_prim
(* It is okay to have [@@val] without payload *)
| _ -> (
match Ast_payload.is_single_string payload with
| Some (val_name, _) -> {name = val_name; source = Payload}
| None -> Location.raise_errorf ~loc "Invalid payload")
in
Ext_list.fold_left prim_attributes ([], init_st)
(fun (attrs, st) (({txt; loc}, payload) as attr) ->
if txt = Literals.gentype_import1 || txt = Literals.gentype_import2 then
let bundle =
"./"
^ Ext_filename.new_extension
(Filename.basename !Location.input_name)
".gen"
in
( attr :: attrs,
{
st with
external_module_name =
Some
{
bundle;
module_bind_name = Phint_nothing;
import_attributes = None;
};
} )
else
let action () =
match txt with
| "val" ->
if no_arguments then
{st with val_name = Some (name_from_payload_or_prim ~loc payload)}
else
{
st with
call_name = Some (name_from_payload_or_prim ~loc payload);
}
| "module" -> (
match payload with
| PStr
[
{
pstr_desc =
Pstr_eval
({pexp_loc; pexp_desc = Pexp_record (fields, _); _}, _);
_;
};
] -> (
let from_name = ref None in
let with_ = ref None in
fields
|> List.iter
(fun
((l, exp) :
Longident.t Location.loc * Parsetree.expression)
->
match (l, exp.pexp_desc) with
| ( {txt = Lident "from"; _},
Pexp_constant (Pconst_string (s, _)) ) ->
from_name := Some s
| {txt = Lident "with"; _}, Pexp_record (fields, _) ->
with_ := Some fields
| _ -> ());
match (!from_name, !with_) with
| None, _ ->
Location.raise_errorf ~loc:pexp_loc
"@module annotations with import attributes must have a \
\"from\" field. This \"from\" field should point to the JS \
module to import, just like the string payload to @module \
normally does."
| Some _, None ->
Location.raise_errorf ~loc:pexp_loc
"@module annotations with import attributes must have a \
\"with\" field. This \"with\" field should hold a record of \
the import attributes you want applied to the import."
| Some from_name, Some with_fields ->
let import_attributes_from_record =
with_fields
|> List.filter_map
(fun
((l, exp) :
Longident.t Location.loc * Parsetree.expression)
->
match exp.pexp_desc with
| Pexp_constant (Pconst_string (s, _)) -> (
match l.txt with
| Longident.Lident "type_" -> Some ("type", s)
| Longident.Lident txt -> Some (txt, s)
| _ ->
Location.raise_errorf ~loc:exp.pexp_loc
"Field must be a regular key.")
| _ ->
Location.raise_errorf ~loc:exp.pexp_loc
"Only string values are allowed here.")
in
let import_attributes =
Hashtbl.create (List.length import_attributes_from_record)
in
import_attributes_from_record
|> List.iter (fun (key, value) ->
Hashtbl.replace import_attributes key value);
{
st with
external_module_name =
Some
{
bundle = from_name;
module_bind_name = Phint_nothing;
import_attributes = Some import_attributes;
};
})
| _ -> (
match Ast_payload.assert_strings loc payload with
| [bundle] ->
{
st with
external_module_name =
Some
{
bundle;
module_bind_name = Phint_nothing;
import_attributes = None;
};
}
| [bundle; bind_name] ->
{
st with
external_module_name =
Some
{
bundle;
module_bind_name = Phint_name bind_name;
import_attributes = None;
};
}
| [] ->
{
st with
module_as_val =
Some
{
bundle = prim_name_or_pval_prim.name;
module_bind_name = Phint_nothing;
import_attributes = None;
};
}
| _ -> Bs_syntaxerr.err loc Illegal_attribute))
| "scope" -> (
match Ast_payload.assert_strings loc payload with
| [] -> Bs_syntaxerr.err loc Illegal_attribute
(* We need err on empty scope, so we can tell the difference
between unset/set
*)
| scopes -> {st with scopes})
| "taggedTemplate" -> {st with splice = true; tagged_template = true}
| "variadic" -> {st with splice = true}
| "send" ->
{st with val_send = Some (name_from_payload_or_prim ~loc payload)}
| "set" ->
{st with set_name = Some (name_from_payload_or_prim ~loc payload)}
| "get" ->
{st with get_name = Some (name_from_payload_or_prim ~loc payload)}
| "new" ->
{st with new_name = Some (name_from_payload_or_prim ~loc payload)}
| "set_index" ->
if String.length prim_name_check <> 0 then
Location.raise_errorf ~loc
"%@set_index this particular external's name needs to be a \
placeholder empty string";
{st with set_index = true}
| "get_index" ->
if String.length prim_name_check <> 0 then
Location.raise_errorf ~loc
"%@get_index this particular external's name needs to be a \
placeholder empty string";
{st with get_index = true}
| "obj" -> {st with mk_obj = true}
| "return" -> (
let actions = Ast_payload.ident_or_record_as_config loc payload in
match actions with
| [({txt; _}, None)] ->
{st with return_wrapper = return_wrapper loc txt}
| _ -> Bs_syntaxerr.err loc Not_supported_directive_in_bs_return)
| _ -> raise_notrace Not_handled_external_attribute
in
try (attrs, action ())
with Not_handled_external_attribute -> (attr :: attrs, st))
let has_bs_uncurry (attrs : Ast_attributes.t) =
Ext_list.exists_fst attrs (fun {txt; loc = _} -> txt = "uncurry")
let check_return_wrapper loc (wrapper : External_ffi_types.return_wrapper)
result_type =
match wrapper with
| Return_identity -> wrapper
| Return_unset ->
if Ast_core_type.is_unit result_type then Return_replaced_with_unit
else wrapper
| Return_undefined_to_opt | Return_null_to_opt | Return_null_undefined_to_opt
->
if Ast_core_type.is_user_option result_type then wrapper
else Bs_syntaxerr.err loc Expect_opt_in_bs_return_to_opt
| Return_replaced_with_unit -> assert false
(* Not going to happen from user input*)
type response = {
pval_type: Parsetree.core_type;
pval_prim: string list;
pval_attributes: Parsetree.attributes;
no_inline_cross_module: bool;
}
let process_obj (loc : Location.t) (st : external_desc) (prim_name : string)
(arg_types_ty : Ast_core_type.param_type list)
(result_type : Ast_core_type.t) : Parsetree.core_type * External_ffi_types.t
=
match st with
| {
val_name = None;
external_module_name = None;
module_as_val = None;
val_send = None;
splice = false;
new_name = None;
call_name = None;
set_name = None;
get_name = None;
get_index = false;
return_wrapper = Return_unset;
tagged_template = _;
set_index = false;
mk_obj = _;
scopes =
[]
(* wrapper does not work with @obj
TODO: better error message *);
} ->
if String.length prim_name <> 0 then
Location.raise_errorf ~loc
"%@obj expect external names to be empty string";
let ( arg_kinds,
new_arg_types_ty,
(result_types : Parsetree.object_field list) ) =
Ext_list.fold_right arg_types_ty ([], [], [])
(fun
param_type
(arg_labels, (arg_types : Ast_core_type.param_type list), result_types)
->
let arg_label = param_type.label in
let loc = param_type.loc in
let ty = param_type.ty in
let new_arg_label, new_arg_types, output_tys =
match arg_label with
| Nolabel -> (
match ty.ptyp_desc with
| Ptyp_constr ({txt = Lident "unit"; _}, []) ->
( External_arg_spec.empty_kind Extern_unit,
param_type :: arg_types,
result_types )
| _ ->
Location.raise_errorf ~loc
"expect label, optional, or unit here")
| Labelled label -> (
let field_name =
match
Ast_attributes.iter_process_bs_string_as param_type.attr
with
| Some alias -> alias
| None -> label
in
let obj_arg_type = refine_obj_arg_type ~nolabel:false ty in
match obj_arg_type with
| Ignore ->
( External_arg_spec.empty_kind obj_arg_type,
param_type :: arg_types,
result_types )
| Arg_cst _ ->
( {
obj_arg_label = External_arg_spec.obj_label field_name;
obj_arg_type;
},
arg_types,
(* ignored in [arg_types], reserved in [result_types] *)
result_types )
| Nothing ->
( {
obj_arg_label = External_arg_spec.obj_label field_name;
obj_arg_type;
},
param_type :: arg_types,
Parsetree.Otag ({Asttypes.txt = field_name; loc}, [], ty)
:: result_types )
| Int _ ->
( {
obj_arg_label = External_arg_spec.obj_label field_name;
obj_arg_type;
},
param_type :: arg_types,
Otag
( {Asttypes.txt = field_name; loc},
[],
Ast_literal.type_int ~loc () )
:: result_types )
| Poly_var_string _ ->
( {
obj_arg_label = External_arg_spec.obj_label field_name;
obj_arg_type;
},
param_type :: arg_types,
Otag
( {Asttypes.txt = field_name; loc},
[],
Ast_literal.type_string ~loc () )
:: result_types )
| Fn_uncurry_arity _ ->
Location.raise_errorf ~loc
"The combination of %@obj, %@uncurry is not supported yet"
| Extern_unit -> assert false
| Poly_var _ ->
Location.raise_errorf ~loc
"%@obj label %s does not support such arg type" label
| Unwrap ->
Location.raise_errorf ~loc
"%@obj label %s does not support %@unwrap arguments" label)
| Optional label -> (
let field_name =
match
Ast_attributes.iter_process_bs_string_as param_type.attr
with
| Some alias -> alias
| None -> label
in
let obj_arg_type = get_opt_arg_type ~nolabel:false ty in
match obj_arg_type with
| Ignore ->
( External_arg_spec.empty_kind obj_arg_type,
param_type :: arg_types,
result_types )
| Nothing ->
let for_sure_not_nested =
match ty.ptyp_desc with
| Ptyp_constr ({txt = Lident txt; _}, []) ->
Ast_core_type.is_builtin_rank0_type txt
| _ -> false
in
( {
obj_arg_label =
External_arg_spec.optional for_sure_not_nested field_name;
obj_arg_type;
},
param_type :: arg_types,
Parsetree.Otag
( {Asttypes.txt = field_name; loc},
[],
Ast_comb.to_undefined_type loc ty )
:: result_types )
| Int _ ->
( {
obj_arg_label = External_arg_spec.optional true field_name;
obj_arg_type;
},
param_type :: arg_types,
Otag
( {Asttypes.txt = field_name; loc},
[],
Ast_comb.to_undefined_type loc
@@ Ast_literal.type_int ~loc () )
:: result_types )
| Poly_var_string _ ->
( {
obj_arg_label = External_arg_spec.optional true field_name;
obj_arg_type;
},
param_type :: arg_types,
Otag
( {Asttypes.txt = field_name; loc},
[],
Ast_comb.to_undefined_type loc
@@ Ast_literal.type_string ~loc () )
:: result_types )
| Arg_cst _ ->
Location.raise_errorf ~loc
"%@as is not supported with optional yet"
| Fn_uncurry_arity _ ->
Location.raise_errorf ~loc
"The combination of %@obj, %@uncurry is not supported yet"
| Extern_unit -> assert false
| Poly_var _ ->
Location.raise_errorf ~loc
"%@obj label %s does not support such arg type" label
| Unwrap ->
Location.raise_errorf ~loc
"%@obj label %s does not support %@unwrap arguments" label)
in
(new_arg_label :: arg_labels, new_arg_types, output_tys))
in
let result =
if result_type.ptyp_desc = Ptyp_any then
Ast_core_type.make_obj ~loc result_types
else result_type
(* TODO: do we need do some error checking here *)
(* result type can not be labeled *)
in
( Ast_core_type.mk_fn_type new_arg_types_ty result,
External_ffi_types.ffi_obj_create arg_kinds )
| _ -> Location.raise_errorf ~loc "Attribute found that conflicts with %@obj"
let external_desc_of_non_obj (loc : Location.t) (st : external_desc)
(prim_name_or_pval_prim : bundle_source) (arg_type_specs_length : int)
arg_types_ty (arg_type_specs : External_arg_spec.params) :
External_ffi_types.external_spec =
match st with
| {
set_index = true;
val_name = None;
external_module_name = None;
module_as_val = None;
val_send = None;
splice = false;
scopes;
get_index = false;
new_name = None;
call_name = None;
set_name = None;
get_name = None;
return_wrapper = _;
mk_obj = _;
tagged_template = _;
} ->
if arg_type_specs_length = 3 then
Js_set_index {js_set_index_scopes = scopes}
else
Location.raise_errorf ~loc
"Ill defined attribute %@set_index (arity of 3)"
| {set_index = true; _} ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with %@set_index")
| {
get_index = true;
val_name = None;
external_module_name = None;
module_as_val = None;
val_send = None;
splice = false;
scopes;
new_name = None;
call_name = None;
set_name = None;
get_name = None;
set_index = false;
mk_obj = _;
return_wrapper = _;
tagged_template = _;
} ->
if arg_type_specs_length = 2 then
Js_get_index {js_get_index_scopes = scopes}
else
Location.raise_errorf ~loc
"Ill defined attribute %@get_index (arity expected 2 : while %d)"
arg_type_specs_length
| {get_index = true; _} ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with %@get_index")
| {
module_as_val = Some external_module_name;
get_index = false;
val_name;
new_name;
external_module_name = None;
val_send = None;
scopes = [];
(* module as var does not need scopes *)
splice;
call_name = None;
set_name = None;
get_name = None;
set_index = false;
return_wrapper = _;
mk_obj = _;
tagged_template = _;
} -> (
match (arg_types_ty, new_name, val_name) with
| [], None, _ -> Js_module_as_var external_module_name
| _, None, _ -> Js_module_as_fn {splice; external_module_name}
| _, Some _, Some _ ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with @module.")
| _, Some {source = External; name = _}, None ->
Js_module_as_class external_module_name
| _, Some {source = Payload; name = _}, None ->
Location.raise_errorf ~loc
"Incorrect FFI attribute found: (%@new should not carry a payload here)"
)
| {module_as_val = Some _; get_index; val_send; _} ->
let reason =
match (get_index, val_send) with
| true, _ ->
"@module is for imports from a module, @get_index does not need import \
a module "
| _, Some _ ->
"@module is for imports from a module, @send does not need import a \
module "
| _ -> "Attribute found that conflicts with @module."
in
Bs_syntaxerr.err loc (Conflict_ffi_attribute reason)
| {
get_name = None;
val_name = None;
call_name = None;
module_as_val = None;
set_index = false;
get_index = false;
val_send = None;
new_name = None;
set_name = None;
external_module_name = None;
splice;
scopes;
mk_obj = _;
(* mk_obj is always false *)
return_wrapper = _;
tagged_template;
} ->
let name = prim_name_or_pval_prim.name in
if arg_type_specs_length = 0 then
(*
{[
external ff : int -> int [@bs] = "" [@@module "xx"]
]}
FIXME: splice is not supported here
*)
Js_var {name; external_module_name = None; scopes}
else
Js_call
{splice; name; external_module_name = None; scopes; tagged_template}
| {
call_name = Some {name; source = _};
splice;
scopes;
external_module_name;
val_name = None;
module_as_val = None;
val_send = None;
set_index = false;
get_index = false;
new_name = None;
set_name = None;
get_name = None;
mk_obj = _;
return_wrapper = _;
tagged_template;
} ->
if arg_type_specs_length = 0 then
(*
{[
external ff : int -> int = "" [@@module "xx"]
]}
*)
Js_var {name; external_module_name; scopes}
(*FIXME: splice is not supported here *)
else Js_call {splice; name; external_module_name; scopes; tagged_template}
| {call_name = Some _; _} ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with %@val")
| {
val_name = Some {name; source = _};
external_module_name;
call_name = None;
module_as_val = None;
val_send = None;
set_index = false;
get_index = false;
new_name = None;
set_name = None;
get_name = None;
mk_obj = _;
return_wrapper = _;
splice = false;
scopes;
tagged_template = _;
} ->
(*
if no_arguments -->
{[
external ff : int = "" [@@val]
]}
*)
Js_var {name; external_module_name; scopes}
| {val_name = Some _; _} ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with %@val")
| {
splice;
scopes;
external_module_name = Some _ as external_module_name;
val_name = None;
call_name = None;
module_as_val = None;
val_send = None;
set_index = false;
get_index = false;
new_name = None;
set_name = None;
get_name = None;
mk_obj = _;
return_wrapper = _;
tagged_template;
} ->
let name = prim_name_or_pval_prim.name in
if arg_type_specs_length = 0 then
(*
{[
external ff : int = "" [@@module "xx"]
]}
*)
Js_var {name; external_module_name; scopes}
else Js_call {splice; name; external_module_name; scopes; tagged_template}
| {
val_send = Some {name; source = _};
splice;
scopes;
val_name = None;
call_name = None;
module_as_val = None;
set_index = false;
get_index = false;
new_name = None;
set_name = None;
get_name = None;
external_module_name = None;
mk_obj = _;
return_wrapper = _;
tagged_template = _;
} -> (
(* PR #2162 - since when we assemble arguments the first argument in
[@@send] is ignored
*)
match arg_type_specs with
| [] ->
Location.raise_errorf ~loc
"Ill defined attribute %@send(the external needs to be a regular \
function call with at least one argument)"
| {arg_type = Arg_cst _; arg_label = _} :: _ ->
Location.raise_errorf ~loc
"Ill defined attribute %@send(first argument can't be const)"
| _ :: _ -> Js_send {splice; name; js_send_scopes = scopes})
| {val_send = Some _; _} ->
Location.raise_errorf ~loc
"You used a FFI attribute that can't be used with %@send"
| {
new_name = Some {name; source = _};
external_module_name;
val_name = None;
call_name = None;
module_as_val = None;
set_index = false;
get_index = false;
val_send = None;
set_name = None;
get_name = None;
splice;
scopes;
mk_obj = _;
return_wrapper = _;
tagged_template = _;
} ->
Js_new {name; external_module_name; splice; scopes}
| {new_name = Some _; _} ->
Bs_syntaxerr.err loc
(Conflict_ffi_attribute "Attribute found that conflicts with %@new")
| {
set_name = Some {name; source = _};
val_name = None;
call_name = None;
module_as_val = None;
set_index = false;
get_index = false;
val_send = None;
new_name = None;
get_name = None;
external_module_name = None;
splice = false;
mk_obj = _;
return_wrapper = _;
scopes;
tagged_template = _;
} ->
if arg_type_specs_length = 2 then
Js_set {js_set_scopes = scopes; js_set_name = name}
else
Location.raise_errorf ~loc
"Ill defined attribute %@set (two args required)"
| {set_name = Some _; _} ->
Location.raise_errorf ~loc "conflict attributes found with %@set"
| {
get_name = Some {name; source = _};
val_name = None;
call_name = None;
module_as_val = None;
set_index = false;
get_index = false;
val_send = None;
new_name = None;
set_name = None;
external_module_name = None;
splice = false;
mk_obj = _;
return_wrapper = _;
scopes;
tagged_template = _;
} ->
if arg_type_specs_length = 1 then
Js_get {js_get_name = name; js_get_scopes = scopes}
else
Location.raise_errorf ~loc
"Ill defined attribute %@get (only one argument)"
| {get_name = Some _; _} ->
Location.raise_errorf ~loc "Attribute found that conflicts with %@get"
(** Note that the passed [type_annotation] is already processed by visitor pattern before*)
let handle_attributes (loc : Bs_loc.t) (type_annotation : Parsetree.core_type)
(prim_attributes : Ast_attributes.t) (prim_name : string) :
Parsetree.core_type * External_ffi_types.t * Parsetree.attributes * bool =
(* sanity check here
{[ int -> int -> (int -> int -> int [@uncurry])]}
It does not make sense
*)
if has_bs_uncurry type_annotation.ptyp_attributes then
Location.raise_errorf ~loc
"%@uncurry can not be applied to the whole definition";
let prim_name_with_source = {name = prim_name; source = External} in
let type_annotation, build_uncurried_type =
match type_annotation.ptyp_desc with
| Ptyp_constr (({txt = Lident "function$"; _} as lid), [t; arity_]) ->
( t,
fun ~arity x ->
let t_arity =
match arity with
| Some arity -> Ast_uncurried.arity_type ~loc arity
| None -> arity_
in
{x with Parsetree.ptyp_desc = Ptyp_constr (lid, [x; t_arity])} )
| _ -> (type_annotation, fun ~arity:_ x -> x)
in
let result_type, arg_types_ty =
(* Note this assumes external type is syntatic (no abstraction)*)
Ast_core_type.list_of_arrow type_annotation
in
if has_bs_uncurry result_type.ptyp_attributes then
Location.raise_errorf ~loc:result_type.ptyp_loc
"%@uncurry can not be applied to tailed position";
let no_arguments = arg_types_ty = [] in
let unused_attrs, external_desc =
parse_external_attributes no_arguments prim_name prim_name_with_source
prim_attributes
in
if external_desc.mk_obj then
(* warn unused attributes here ? *)
let new_type, spec =
process_obj loc external_desc prim_name arg_types_ty result_type
in
(build_uncurried_type ~arity:None new_type, spec, unused_attrs, false)
else
let splice = external_desc.splice in
let arg_type_specs, new_arg_types_ty, arg_type_specs_length =
Ext_list.fold_right arg_types_ty
(([], [], 0)
: External_arg_spec.params * Ast_core_type.param_type list * int)
(fun param_type (arg_type_specs, arg_types, i) ->
let arg_label = param_type.label in
let ty = param_type.ty in
(if i = 0 && splice then
match arg_label with
| Optional _ ->
Location.raise_errorf ~loc
"%@variadic expect the last type to be a non optional"
| Labelled _ | Nolabel -> (
if ty.ptyp_desc = Ptyp_any then
Location.raise_errorf ~loc
"%@variadic expect the last type to be an array";
if spec_of_ptyp true ty <> Nothing then
Location.raise_errorf ~loc
"%@variadic expect the last type to be an array";
match ty.ptyp_desc with