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ast_builder.ml
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ast_builder.ml
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open! Import
module Default = struct
module Located = struct
type 'a t = 'a Loc.t
let loc (x : _ t) = x.loc
let mk ~loc x = { loc; txt = x }
let map f t = { t with txt = f t.txt }
let map_lident x = map (fun x -> Longident.Lident x) x
let lident ~loc x = mk ~loc (Longident.parse x)
end
include Ast_builder_generated.M
module Latest = struct
let ppat_construct = ppat_construct
let constructor_declaration ~loc ~name ~vars ~args ~res () =
constructor_declaration ~loc ~name ~vars ~args ~res
end
(*------ stable layer above Ast_builder_generated.M -----*)
let ppat_construct ~loc lid p =
{
ppat_loc_stack = [];
ppat_attributes = [];
ppat_loc = loc;
ppat_desc = Ppat_construct (lid, Option.map p ~f:(fun p -> ([], p)));
}
let constructor_declaration ~loc ~name ~args ~res =
{
pcd_name = name;
pcd_vars = [];
pcd_args = args;
pcd_res = res;
pcd_loc = loc;
pcd_attributes = [];
}
(*-------------------------------------------------------*)
let pstr_value_list ~loc rec_flag = function
| [] -> []
| vbs -> [ pstr_value ~loc rec_flag vbs ]
let nonrec_type_declaration ~loc:_ ~name:_ ~params:_ ~cstrs:_ ~kind:_
~private_:_ ~manifest:_ =
failwith
"Ppxlib.Ast_builder.nonrec_type_declaration: don't use this function"
let eint ~loc t = pexp_constant ~loc (Pconst_integer (Int.to_string t, None))
let echar ~loc t = pexp_constant ~loc (Pconst_char t)
let estring ~loc t = pexp_constant ~loc (Pconst_string (t, loc, None))
let efloat ~loc t = pexp_constant ~loc (Pconst_float (t, None))
let eint32 ~loc t =
pexp_constant ~loc (Pconst_integer (Int32.to_string t, Some 'l'))
let eint64 ~loc t =
pexp_constant ~loc (Pconst_integer (Int64.to_string t, Some 'L'))
let enativeint ~loc t =
pexp_constant ~loc (Pconst_integer (Nativeint.to_string t, Some 'n'))
let pint ~loc t = ppat_constant ~loc (Pconst_integer (Int.to_string t, None))
let pchar ~loc t = ppat_constant ~loc (Pconst_char t)
let pstring ~loc t = ppat_constant ~loc (Pconst_string (t, loc, None))
let pfloat ~loc t = ppat_constant ~loc (Pconst_float (t, None))
let pint32 ~loc t =
ppat_constant ~loc (Pconst_integer (Int32.to_string t, Some 'l'))
let pint64 ~loc t =
ppat_constant ~loc (Pconst_integer (Int64.to_string t, Some 'L'))
let pnativeint ~loc t =
ppat_constant ~loc (Pconst_integer (Nativeint.to_string t, Some 'n'))
let ebool ~loc t =
pexp_construct ~loc (Located.lident ~loc (Bool.to_string t)) None
let pbool ~loc t =
ppat_construct ~loc (Located.lident ~loc (Bool.to_string t)) None
let evar ~loc v = pexp_ident ~loc (Located.mk ~loc (Longident.parse v))
let pvar ~loc v = ppat_var ~loc (Located.mk ~loc v)
let eunit ~loc = pexp_construct ~loc (Located.lident ~loc "()") None
let punit ~loc = ppat_construct ~loc (Located.lident ~loc "()") None
let pexp_tuple ~loc l = match l with [ x ] -> x | _ -> pexp_tuple ~loc l
let ppat_tuple ~loc l = match l with [ x ] -> x | _ -> ppat_tuple ~loc l
let ptyp_tuple ~loc l = match l with [ x ] -> x | _ -> ptyp_tuple ~loc l
let pexp_tuple_opt ~loc l =
match l with [] -> None | _ :: _ -> Some (pexp_tuple ~loc l)
let ppat_tuple_opt ~loc l =
match l with [] -> None | _ :: _ -> Some (ppat_tuple ~loc l)
let ptyp_poly ~loc vars ty =
match vars with [] -> ty | _ -> ptyp_poly ~loc vars ty
let pexp_apply ~loc e el =
match (e, el) with
| _, [] -> e
| { pexp_desc = Pexp_apply (e, args); pexp_attributes = []; _ }, _ ->
{ e with pexp_desc = Pexp_apply (e, args @ el) }
| _ -> pexp_apply ~loc e el
let eapply ~loc e el =
pexp_apply ~loc e (List.map el ~f:(fun e -> (Asttypes.Nolabel, e)))
let eabstract ~loc ps e =
List.fold_right ps ~init:e ~f:(fun p e ->
pexp_fun ~loc Asttypes.Nolabel None p e)
let esequence ~loc el =
match List.rev el with
| [] -> eunit ~loc
| hd :: tl ->
List.fold_left tl ~init:hd ~f:(fun acc e -> pexp_sequence ~loc e acc)
let pconstruct cd arg =
ppat_construct ~loc:cd.pcd_loc (Located.map_lident cd.pcd_name) arg
let econstruct cd arg =
pexp_construct ~loc:cd.pcd_loc (Located.map_lident cd.pcd_name) arg
let rec elist_tail ~loc l tail =
match l with
| [] -> tail
| x :: l ->
pexp_construct ~loc
(Located.mk ~loc (Longident.Lident "::"))
(Some (pexp_tuple ~loc [ x; elist_tail ~loc l tail ]))
let elist ~loc l =
let tail =
pexp_construct ~loc (Located.mk ~loc (Longident.Lident "[]")) None
in
elist_tail ~loc l tail
let rec plist_tail ~loc l tail =
match l with
| [] -> tail
| x :: l ->
ppat_construct ~loc
(Located.mk ~loc (Longident.Lident "::"))
(Some (ppat_tuple ~loc [ x; plist_tail ~loc l tail ]))
let plist ~loc l =
let tail =
ppat_construct ~loc (Located.mk ~loc (Longident.Lident "[]")) None
in
plist_tail ~loc l tail
let unapplied_type_constr_conv_without_apply ~loc (ident : Longident.t) ~f =
match ident with
| Lident n -> pexp_ident ~loc { txt = Lident (f n); loc }
| Ldot (path, n) -> pexp_ident ~loc { txt = Ldot (path, f n); loc }
| Lapply _ ->
Location.raise_errorf ~loc "unexpected applicative functor type"
let type_constr_conv ~loc:apply_loc { Loc.loc; txt = longident } ~f args =
let loc = { loc with loc_ghost = true } in
match (longident : Longident.t) with
| Lident _ | Ldot ((Lident _ | Ldot _), _) | Lapply _ -> (
let ident =
unapplied_type_constr_conv_without_apply longident ~loc ~f
in
match args with
| [] -> ident
| _ :: _ -> eapply ~loc:apply_loc ident args)
| Ldot ((Lapply _ as module_path), n) ->
let suffix_n functor_ = String.uncapitalize_ascii functor_ ^ "__" ^ n in
let rec gather_lapply functor_args : Longident.t -> Longident.t * _ =
function
| Lapply (rest, arg) -> gather_lapply (arg :: functor_args) rest
| Lident functor_ -> (Lident (suffix_n functor_), functor_args)
| Ldot (functor_path, functor_) ->
(Ldot (functor_path, suffix_n functor_), functor_args)
in
let ident, functor_args = gather_lapply [] module_path in
eapply ~loc:apply_loc
(unapplied_type_constr_conv_without_apply ident ~loc ~f)
(List.map functor_args ~f:(fun path ->
pexp_pack ~loc (pmod_ident ~loc { txt = path; loc }))
@ args)
let unapplied_type_constr_conv ~loc longident ~f =
type_constr_conv longident ~loc ~f []
let eta_reduce =
let rec gather_params acc expr =
match expr with
| {
pexp_desc =
Pexp_fun (label, None (* no default expression *), subpat, body);
pexp_attributes = [];
pexp_loc = _;
pexp_loc_stack = _;
} -> (
match subpat with
| {
ppat_desc = Ppat_var name;
ppat_attributes = [];
ppat_loc = _;
ppat_loc_stack = _;
} ->
gather_params ((label, name, None) :: acc) body
| {
ppat_desc =
Ppat_constraint
( {
ppat_desc = Ppat_var name;
ppat_attributes = [];
ppat_loc = _;
ppat_loc_stack = _;
},
ty );
ppat_attributes = [];
ppat_loc = _;
ppat_loc_stack = _;
} ->
(* We reduce [fun (x : ty) -> f x] by rewriting it [(f : ty -> _)]. *)
gather_params ((label, name, Some ty) :: acc) body
| _ -> (List.rev acc, expr))
| _ -> (List.rev acc, expr)
in
let annotate ~loc expr params =
if List.exists params ~f:(fun (_, _, ty) -> Option.is_some ty) then
let ty =
List.fold_right params ~init:(ptyp_any ~loc)
~f:(fun (param_label, param, ty_opt) acc ->
let loc = param.loc in
let ty =
match ty_opt with None -> ptyp_any ~loc | Some ty -> ty
in
ptyp_arrow ~loc param_label ty acc)
in
pexp_constraint ~loc expr ty
else expr
in
let rec gather_args n x =
if n = 0 then Some (x, [])
else
match x with
| {
pexp_desc = Pexp_apply (body, args);
pexp_attributes = [];
pexp_loc = _;
pexp_loc_stack = _;
} ->
if List.length args <= n then
match gather_args (n - List.length args) body with
| None -> None
| Some (body, args') -> Some (body, args' @ args)
else None
| _ -> None
in
fun expr ->
let params, body = gather_params [] expr in
match gather_args (List.length params) body with
| None -> None
| Some (({ pexp_desc = Pexp_ident _; _ } as f_ident), args) -> (
match
List.for_all2 args params
~f:(fun (arg_label, arg) (param_label, param, _) ->
Poly.( = ) (arg_label : arg_label) param_label
&&
match arg with
| {
pexp_desc = Pexp_ident { txt = Lident name'; _ };
pexp_attributes = [];
pexp_loc = _;
pexp_loc_stack = _;
} ->
String.( = ) name' param.txt
| _ -> false)
with
| false -> None
| true -> Some (annotate ~loc:expr.pexp_loc f_ident params))
| _ -> None
let eta_reduce_if_possible expr = Option.value (eta_reduce expr) ~default:expr
let eta_reduce_if_possible_and_nonrec expr ~rec_flag =
match rec_flag with
| Recursive -> expr
| Nonrecursive -> eta_reduce_if_possible expr
end
module type Loc = Ast_builder_intf.Loc
module type S = sig
include Ast_builder_intf.S
module Latest : sig
val ppat_construct :
longident loc -> (label loc list * pattern) option -> pattern
val constructor_declaration :
name:label loc ->
vars:label loc list ->
args:constructor_arguments ->
res:core_type option ->
unit ->
constructor_declaration
end
val ppat_construct : longident loc -> pattern option -> pattern
val constructor_declaration :
name:label loc ->
args:constructor_arguments ->
res:core_type option ->
constructor_declaration
end
module Make (Loc : sig
val loc : Location.t
end) : S = struct
include Ast_builder_generated.Make (Loc)
module Latest = struct
let ppat_construct = ppat_construct
let constructor_declaration ~name ~vars ~args ~res () =
constructor_declaration ~name ~vars ~args ~res
end
(*----- stable layer above Ast_builder_generated.Make (Loc) -----*)
let ppat_construct lid p =
{
ppat_loc_stack = [];
ppat_attributes = [];
ppat_loc = loc;
ppat_desc = Ppat_construct (lid, Option.map p ~f:(fun p -> ([], p)));
}
let constructor_declaration ~name ~args ~res =
{
pcd_name = name;
pcd_vars = [];
pcd_args = args;
pcd_res = res;
pcd_loc = loc;
pcd_attributes = [];
}
(*---------------------------------------------------------------*)
let pstr_value_list = Default.pstr_value_list
let nonrec_type_declaration ~name ~params ~cstrs ~kind ~private_ ~manifest =
Default.nonrec_type_declaration ~loc ~name ~params ~cstrs ~kind ~private_
~manifest
module Located = struct
include Default.Located
let loc _ = Loc.loc
let mk x = mk ~loc:Loc.loc x
let lident x = lident ~loc:Loc.loc x
end
let pexp_tuple l = Default.pexp_tuple ~loc l
let ppat_tuple l = Default.ppat_tuple ~loc l
let ptyp_tuple l = Default.ptyp_tuple ~loc l
let pexp_tuple_opt l = Default.pexp_tuple_opt ~loc l
let ppat_tuple_opt l = Default.ppat_tuple_opt ~loc l
let ptyp_poly vars ty = Default.ptyp_poly ~loc vars ty
let pexp_apply e el = Default.pexp_apply ~loc e el
let eint t = Default.eint ~loc t
let echar t = Default.echar ~loc t
let estring t = Default.estring ~loc t
let efloat t = Default.efloat ~loc t
let eint32 t = Default.eint32 ~loc t
let eint64 t = Default.eint64 ~loc t
let enativeint t = Default.enativeint ~loc t
let ebool t = Default.ebool ~loc t
let evar t = Default.evar ~loc t
let pint t = Default.pint ~loc t
let pchar t = Default.pchar ~loc t
let pstring t = Default.pstring ~loc t
let pfloat t = Default.pfloat ~loc t
let pint32 t = Default.pint32 ~loc t
let pint64 t = Default.pint64 ~loc t
let pnativeint t = Default.pnativeint ~loc t
let pbool t = Default.pbool ~loc t
let pvar t = Default.pvar ~loc t
let eunit = Default.eunit ~loc
let punit = Default.punit ~loc
let econstruct = Default.econstruct
let pconstruct = Default.pconstruct
let eapply e el = Default.eapply ~loc e el
let eabstract ps e = Default.eabstract ~loc ps e
let esequence el = Default.esequence ~loc el
let elist_tail l tail = Default.elist_tail ~loc l tail
let plist_tail l tail = Default.plist_tail ~loc l tail
let elist l = Default.elist ~loc l
let plist l = Default.plist ~loc l
let type_constr_conv ident ~f args =
Default.type_constr_conv ~loc ident ~f args
let unapplied_type_constr_conv ident ~f =
Default.unapplied_type_constr_conv ~loc ident ~f
let eta_reduce = Default.eta_reduce
let eta_reduce_if_possible = Default.eta_reduce_if_possible
let eta_reduce_if_possible_and_nonrec =
Default.eta_reduce_if_possible_and_nonrec
end
let make loc =
(module Make (struct
let loc = loc
end) : S)