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ast_derive_js_mapper.ml
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(* Copyright (C) 2017 Authors of BuckleScript
*
* 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. *)
open Ast_helper
module U = Ast_derive_util
type tdcls = Parsetree.type_declaration list
let js_field (o : Parsetree.expression) m =
Ast_compatible.app2
(Exp.ident {txt = Lident "##"; loc = o.pexp_loc})
o
(Exp.ident m)
let handle_config (config : Parsetree.expression option) =
match config with
| Some config ->
(match config.pexp_desc with
| Pexp_record (
[
{txt = Lident "newType"},
{pexp_desc =
(Pexp_construct
(
{txt =
Lident ("true"
| "false"
as x)}, None)
| Pexp_ident {txt = Lident ("newType" as x)}
)
}
],None)
-> not (x = "false")
| Pexp_ident {txt = Lident ("newType")}
-> true
| _ -> U.invalid_config config)
| None -> false
let noloc = Location.none
(* [eraseType] will be instrumented, be careful about the name conflict*)
let eraseTypeLit = "jsMapperEraseType"
let eraseTypeExp = Exp.ident {loc = noloc; txt = Lident eraseTypeLit}
let eraseType x =
Ast_compatible.app1 eraseTypeExp x
let eraseTypeStr =
let any = Typ.any () in
Str.primitive
(Val.mk ~prim:["%identity"] {loc = noloc; txt = eraseTypeLit}
(Ast_compatible.arrow any any)
)
let app2 = Ast_compatible.app2
let app3 = Ast_compatible.app3
let (<=~) a b =
app2 (Exp.ident {loc = noloc; txt = Lident "<="}) a b
let (-~) a b =
app2 (Exp.ident {loc = noloc; txt = Ldot(Lident "Pervasives","-")})
a b
let (+~) a b =
app2 (Exp.ident {loc = noloc; txt = Ldot(Lident "Pervasives","+")})
a b
let (&&~) a b =
app2 (Exp.ident {loc = noloc; txt = Ldot(Lident "Pervasives","&&")})
a b
let (->~) a b = Ast_compatible.arrow a b
let jsMapperRt =
Longident.Ldot (Lident "Js", "MapperRt")
let search upper polyvar array =
app3
(Exp.ident ({loc = noloc;
txt = Longident.Ldot (jsMapperRt,"binarySearch") })
)
upper
(eraseType polyvar)
array
let revSearch len constantArray exp =
app3
(Exp.ident
{loc= noloc;
txt = Longident.Ldot (jsMapperRt, "revSearch")})
len
constantArray
exp
let revSearchAssert len constantArray exp =
app3
(Exp.ident
{loc= noloc;
txt = Longident.Ldot (jsMapperRt, "revSearchAssert")})
len
constantArray
exp
let toInt exp array =
app2
(Exp.ident
{ loc=noloc;
txt = Longident.Ldot (jsMapperRt, "toInt")})
(eraseType exp)
array
let fromInt len array exp =
app3
(Exp.ident
{loc = noloc;
txt = Longident.Ldot (jsMapperRt,"fromInt")})
len
array
exp
let fromIntAssert len array exp =
app3
(Exp.ident
{loc = noloc;
txt = Longident.Ldot (jsMapperRt,"fromIntAssert")})
len
array
exp
let assertExp e =
Exp.extension
({Asttypes.loc = noloc; txt = "assert"},
(PStr
[Str.eval e ]
)
)
let derivingName = "jsConverter"
(* let notApplicable loc =
Location.prerr_warning
loc
(Warnings.Bs_derive_warning ( derivingName ^ " not applicable to this type")) *)
let init () =
Ast_derive.register
derivingName
(fun ( x : Parsetree.expression option) ->
let createType = handle_config x in
{
structure_gen = (fun (tdcls : tdcls) _ ->
let handle_tdcl (tdcl: Parsetree.type_declaration) =
let core_type = U.core_type_of_type_declaration tdcl
in
let name = tdcl.ptype_name.txt in
let toJs = name ^ "ToJs" in
let fromJs = name ^ "FromJs" in
let constantArray = "jsMapperConstantArray" in
let loc = tdcl.ptype_loc in
let patToJs = {Asttypes.loc; txt = toJs} in
let patFromJs = {Asttypes.loc; txt = fromJs} in
let param = "param" in
let ident_param = {Asttypes.txt = Longident.Lident param; loc} in
let pat_param = {Asttypes.loc; txt = param} in
let exp_param = Exp.ident ident_param in
let newType,newTdcl =
U.new_type_of_type_declaration tdcl ("abs_" ^ name) in
let newTypeStr =
(* Abstract type *)
Ast_compatible.rec_type_str Nonrecursive [newTdcl] in
let toJsBody body =
Ast_comb.single_non_rec_value patToJs
(Ast_compatible.fun_ (Pat.constraint_ (Pat.var pat_param) core_type)
body )
in
let (+>) a ty =
Exp.constraint_ (eraseType a) ty in
let (+:) a ty =
eraseType (Exp.constraint_ a ty) in
let coerceResultToNewType e =
if createType then
e +> newType
else e in
match tdcl.ptype_kind with
| Ptype_record label_declarations ->
let exp =
coerceResultToNewType
(Exp.extension
(
{Asttypes.loc; txt = "bs.obj"},
(PStr
[Str.eval
(Exp.record
(Ext_list.map label_declarations
(fun {pld_name = {loc; txt } } ->
let label =
{Asttypes.loc; txt = Longident.Lident txt } in
label,Exp.field exp_param label) ) None)]))) in
let toJs =
toJsBody exp
in
let obj_exp =
Exp.record
(Ext_list.map label_declarations
(fun {pld_name = {loc; txt } } ->
let label =
{Asttypes.loc; txt = Longident.Lident txt } in
label,
js_field exp_param label) ) None in
let fromJs =
Ast_comb.single_non_rec_value patFromJs
(Ast_compatible.fun_ (Pat.var pat_param)
(if createType then
(Exp.let_ Nonrecursive
[Vb.mk
(Pat.var pat_param)
(exp_param +: newType)]
(Exp.constraint_ obj_exp core_type) )
else
(Exp.constraint_ obj_exp core_type) ))
in
let rest =
[
toJs;
fromJs
] in
if createType then eraseTypeStr:: newTypeStr :: rest else rest
| Ptype_abstract ->
(match Ast_polyvar.is_enum_polyvar tdcl with
| Some row_fields ->
let expConstantArray =
Exp.ident {loc; txt = Longident.Lident constantArray} in
let result : _ list =
Ext_list.map row_fields (fun tag ->
match tag with
| Rtag (label, attrs, _, []) ->
(Ast_compatible.hash_label label,
match Ast_attributes.iter_process_bs_string_as_ast attrs with
| Some name ->
name
| None ->
Ast_compatible.const_exp_string(Ast_compatible.label_of_name label)
)
| _ -> assert false (* checked by [is_enum_polyvar] *)
) in
let result_len = List.length result in
let exp_len = Ast_compatible.const_exp_int result_len in
let v = [
eraseTypeStr;
Ast_comb.single_non_rec_value
{loc; txt = constantArray}
(Exp.array
(Ext_list.map (List.sort (fun (a,_) (b,_) -> compare (a:int) b) result)
(fun (i,str) ->
Exp.tuple
[
Ast_compatible.const_exp_int i;
str
]
) ));
(
toJsBody
(coerceResultToNewType
(search
exp_len
exp_param
expConstantArray
))
);
Ast_comb.single_non_rec_value
patFromJs
(Ast_compatible.fun_
(Pat.var pat_param)
(if createType then
revSearchAssert
exp_len
expConstantArray
(exp_param +: newType)
+>
core_type
else
revSearch
exp_len
expConstantArray
exp_param
+>
Ast_core_type.lift_option_type core_type
)
)
] in
if createType then
newTypeStr :: v
else v
| None ->
U.notApplicable
tdcl.Parsetree.ptype_loc
derivingName;
[]
)
| Ptype_variant ctors ->
if Ast_polyvar.is_enum_constructors ctors then
let xs = Ast_polyvar.map_constructor_declarations_into_ints ctors in
match xs with
| `New xs ->
let constantArrayExp = Exp.ident {loc; txt = Lident constantArray} in
let exp_len = Ast_compatible.const_exp_int (List.length ctors) in
let v = [
eraseTypeStr;
Ast_comb.single_non_rec_value
{loc; txt = constantArray}
(Ast_compatible.const_exp_int_list_as_array xs)
;
toJsBody
(
coerceResultToNewType @@
toInt
exp_param
constantArrayExp
)
;
Ast_comb.single_non_rec_value
patFromJs
(Ast_compatible.fun_
(Pat.var pat_param)
(
if createType then
fromIntAssert
exp_len
constantArrayExp
(exp_param +: newType)
+>
core_type
else
fromInt
exp_len
constantArrayExp
exp_param
+>
Ast_core_type.lift_option_type core_type
)
)
] in
if createType then newTypeStr :: v else v
| `Offset offset ->
let v =
[ eraseTypeStr;
toJsBody (
coerceResultToNewType
(eraseType exp_param +~ Ast_compatible.const_exp_int offset)
)
;
let len = List.length ctors in
let range_low = Ast_compatible.const_exp_int (offset + 0) in
let range_upper = Ast_compatible.const_exp_int (offset + len - 1) in
Ast_comb.single_non_rec_value
{loc ; txt = fromJs}
(Ast_compatible.fun_
(Pat.var pat_param)
(if createType then
(Exp.let_ Nonrecursive
[Vb.mk
(Pat.var pat_param)
(exp_param +: newType)
]
(
Exp.sequence
(assertExp
((exp_param <=~ range_upper) &&~ (range_low <=~ exp_param))
)
(exp_param -~ Ast_compatible.const_exp_int offset))
)
+>
core_type
else
Exp.ifthenelse
( (exp_param <=~ range_upper) &&~ (range_low <=~ exp_param))
(Exp.construct {loc; txt = Ast_literal.predef_some}
( Some (exp_param -~ Ast_compatible.const_exp_int offset)))
(Some (Exp.construct {loc; txt = Ast_literal.predef_none} None))
+>
Ast_core_type.lift_option_type core_type
)
)
] in
if createType then newTypeStr :: v else v
else
begin
U.notApplicable
tdcl.Parsetree.ptype_loc
derivingName;
[]
end
| Ptype_open ->
U.notApplicable tdcl.Parsetree.ptype_loc
derivingName;
[] in
Ext_list.flat_map tdcls handle_tdcl
);
signature_gen =
(fun (tdcls : tdcls) _ ->
let handle_tdcl tdcl =
let core_type = U.core_type_of_type_declaration tdcl
in
let name = tdcl.ptype_name.txt in
let toJs = name ^ "ToJs" in
let fromJs = name ^ "FromJs" in
let loc = tdcl.ptype_loc in
let patToJs = {Asttypes.loc; txt = toJs} in
let patFromJs = {Asttypes.loc; txt = fromJs} in
let toJsType result =
Ast_comb.single_non_rec_val patToJs (Ast_compatible.arrow core_type result) in
let newType,newTdcl =
U.new_type_of_type_declaration tdcl ("abs_" ^ name) in
let newTypeStr = Ast_compatible.rec_type_sig Nonrecursive [newTdcl] in
let (+?) v rest = if createType then v :: rest else rest in
match tdcl.ptype_kind with
| Ptype_record label_declarations ->
let objType flag =
Ast_comb.to_js_type loc @@
Ast_compatible.object_
(Ext_list.map label_declarations
(fun {pld_name ; pld_type } ->
pld_name, [], pld_type))
flag in
newTypeStr +?
[
toJsType (if createType then newType else objType Closed);
Ast_comb.single_non_rec_val patFromJs
( (if createType then newType else objType Open)->~ core_type)
]
| Ptype_abstract ->
(match Ast_polyvar.is_enum_polyvar tdcl with
| Some _ ->
let ty1 =
if createType then newType else
(Ast_literal.type_string ()) in
let ty2 =
if createType then core_type
else Ast_core_type.lift_option_type core_type in
newTypeStr +?
[
toJsType ty1;
Ast_comb.single_non_rec_val
patFromJs
(ty1 ->~ ty2)
]
| None ->
U.notApplicable tdcl.Parsetree.ptype_loc
derivingName;
[])
| Ptype_variant ctors
->
if Ast_polyvar.is_enum_constructors ctors then
let ty1 =
if createType then newType
else Ast_literal.type_int() in
let ty2 =
if createType then core_type
else Ast_core_type.lift_option_type core_type in
newTypeStr +?
[
toJsType ty1;
Ast_comb.single_non_rec_val
patFromJs
(ty1 ->~ ty2)
]
else
begin
U.notApplicable tdcl.Parsetree.ptype_loc
derivingName;
[]
end
| Ptype_open ->
U.notApplicable tdcl.Parsetree.ptype_loc
derivingName;
[] in
Ext_list.flat_map tdcls handle_tdcl
);
expression_gen = None
}
)
;