-
Notifications
You must be signed in to change notification settings - Fork 57
/
Copy pathoj_emit.ml
1490 lines (1384 loc) · 42.5 KB
/
oj_emit.ml
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
(*
OCaml code generator for the json format.
*)
open Atd.Import
open Indent
open Atd.Ast
open Mapping
module Json = Atd.Json
let target : Ocaml.target = Json
let annot_schema = Ocaml.annot_schema_of_target target
(*
OCaml code generator (json readers and writers)
*)
type param = {
deref : (Ocaml.Repr.t, Json.json_repr) Mapping.mapping ->
(Ocaml.Repr.t, Json.json_repr) Mapping.mapping;
std : bool;
unknown_field_handler : string option;
(* Optional handler that takes a field name as argument
and does something with it such as displaying a warning message. *)
force_defaults : bool;
preprocess_input : string option;
(* intended for UTF-8 validation *)
ocaml_version: (int * int) option;
}
let writer_parameters params =
String.concat "" (
List.map
(fun s -> sprintf "\n (Buffer.t -> '%s -> unit) ->" s)
params
)
let reader_parameters params =
String.concat "" (
List.map
(fun s ->
sprintf "\n (Yojson.Safe.lexer_state -> \
Lexing.lexbuf -> '%s) ->" s)
params
)
let val_write buf fun_name writer_params full_name short_name =
bprintf buf "\
val %s :%s
Buffer.t -> %s -> unit
(** Output a JSON value of type {!type:%s}. *)
"
fun_name writer_params
full_name
short_name
let val_string_of buf fun_name writer_params full_name short_name =
bprintf buf "\
val %s :%s
?len:int -> %s -> string
(** Serialize a value of type {!type:%s}
into a JSON string.
@param len specifies the initial length
of the buffer used internally.
Default: 1024. *)
"
fun_name writer_params
full_name
short_name
let val_read buf fun_name reader_params full_name short_name =
bprintf buf "\
val %s :%s
Yojson.Safe.lexer_state -> Lexing.lexbuf -> %s
(** Input JSON data of type {!type:%s}. *)
"
fun_name reader_params
full_name
short_name
let val_of_string buf fun_name reader_params full_name short_name =
bprintf buf "\
val %s :%s
string -> %s
(** Deserialize JSON data of type {!type:%s}. *)
"
fun_name reader_params
full_name
short_name
let make_ocaml_json_intf ~with_create buf deref defs =
List.concat_map snd defs
|> List.filter Ox_emit.include_intf
|> List.iter (fun x ->
let s = x.def_name in
let full_name = Ox_emit.get_full_type_name x in
let writer_params = writer_parameters x.def_param in
let reader_params = reader_parameters x.def_param in
val_write buf (sprintf "write_%s" s)
writer_params full_name s;
val_string_of buf (sprintf "string_of_%s" s)
writer_params full_name s;
val_read buf (sprintf "read_%s" s)
reader_params full_name s;
val_of_string buf (sprintf "%s_of_string" s)
reader_params full_name s;
Ox_emit.maybe_write_creator_intf ~with_create deref buf x
)
let insert sep l =
let rec ins sep = function
[] -> []
| x :: l -> sep :: x :: ins sep l
in
match l with
[] -> []
| x :: l -> x :: ins sep l
let make_json_string s = Yojson.Safe.to_string (`String s)
(*
('a, 'b) t -> write_t write__a write__b
('a, foo) t -> write_t write__a write_foo
('a, (foo, 'b) bar) t -> write_t write__a (write_bar write_foo write__b)
*)
let rec get_writer_name
?(paren = false)
?(name_f = fun s -> "write_" ^ s)
p (x : Oj_mapping.t) : string =
match x with
Unit (_, Ocaml.Repr.Unit, Unit) ->
"Yojson.Safe.write_null"
| Bool (_, Bool, Bool) ->
"Yojson.Safe.write_bool"
| Int (_, Int o, Int j) ->
(match o, j with
| Int, Int -> "Yojson.Safe.write_int"
| Int, String -> "Atdgen_runtime.Oj_run.write_int_as_string"
| Char, Int -> "Atdgen_runtime.Oj_run.write_int8"
| Char, String -> "Atdgen_runtime.Oj_run.write_int8_as_string"
| Int32, Int -> "Atdgen_runtime.Oj_run.write_int32"
| Int32, String -> "Atdgen_runtime.Oj_run.write_int32_as_string"
| Int64, Int -> "Atdgen_runtime.Oj_run.write_int64"
| Int64, String -> "Atdgen_runtime.Oj_run.write_int64_as_string"
| Float, Int -> "Atdgen_runtime.Oj_run.write_float_as_int"
| Float, String -> "Atdgen_runtime.Oj_run.write_float_as_int_string"
)
| Float (_, Float, Float j) ->
(match j with
Float None ->
if p.std then "Yojson.Safe.write_std_float"
else "Yojson.Safe.write_float"
| Float (Some precision) ->
if p.std then
sprintf "Yojson.Safe.write_std_float_prec %i" precision
else
sprintf "Yojson.Safe.write_float_prec %i" precision
| Int ->
"Atdgen_runtime.Oj_run.write_float_as_int"
)
| String (_, String, String) ->
"Yojson.Safe.write_string"
| Abstract (_, Abstract, Abstract) ->
"Yojson.Safe.write_json"
| Tvar (_, s) -> "write_" ^ (Ox_emit.name_of_var s)
| Name (_, s, args, None, None) ->
let l = List.map (get_writer_name ~paren:true p) args in
let s = String.concat " " (name_f s :: l) in
if paren && l <> [] then "(" ^ s ^ ")"
else s
| External (_, _, args,
External (_, main_module, ext_name),
External) ->
let f = main_module ^ "." ^ name_f ext_name in
let l = List.map (get_writer_name ~paren:true p) args in
let s = String.concat " " (f :: l) in
if paren && l <> [] then "(" ^ s ^ ")"
else s
| Unit _ | Bool _ | Int _ | Float _ | String _ | Abstract _
| Sum _ | Record _ | Tuple _ | List _ | Option _ | Nullable _
| Wrap _ | Name _ | External _ -> assert false
let get_left_writer_name p name param =
let args = List.map (fun s -> Tvar (dummy_loc, s)) param in
get_writer_name p (Name (dummy_loc, name, args, None, None))
let get_left_to_string_name p name param =
let name_f s = "string_of_" ^ s in
let args = List.map (fun s -> Tvar (dummy_loc, s)) param in
get_writer_name ~name_f p (Name (dummy_loc, name, args, None, None))
let rec get_reader_name
?(paren = false)
?(name_f = fun s -> "read_" ^ s)
p (x : Oj_mapping.t) : string =
match x with
Unit (_, Unit, Unit) -> "Atdgen_runtime.Oj_run.read_null"
| Bool (_, Bool, Bool) -> "Atdgen_runtime.Oj_run.read_bool"
| Int (_, Int o, Int _) ->
(match o with
Int -> "Atdgen_runtime.Oj_run.read_int"
| Char -> "Atdgen_runtime.Oj_run.read_int8"
| Int32 -> "Atdgen_runtime.Oj_run.read_int32"
| Int64 -> "Atdgen_runtime.Oj_run.read_int64"
| Float -> "Atdgen_runtime.Oj_run.read_number"
)
| Float (_, Float, Float _) -> "Atdgen_runtime.Oj_run.read_number"
| String (_, String, String) -> "Atdgen_runtime.Oj_run.read_string"
| Abstract (_, Abstract, Abstract) -> "Atdgen_runtime.Oj_run.read_json"
| Tvar (_, s) -> "read_" ^ Ox_emit.name_of_var s
| Name (_, s, args, None, None) ->
let l = List.map (get_reader_name ~paren:true p) args in
let s = String.concat " " (name_f s :: l) in
if paren && l <> [] then "(" ^ s ^ ")"
else s
| External (_, _, args,
External (_, main_module, ext_name),
External) ->
let f = main_module ^ "." ^ name_f ext_name in
let l = List.map (get_reader_name ~paren:true p) args in
let s = String.concat " " (f :: l) in
if paren && l <> [] then "(" ^ s ^ ")"
else s
| Unit _ | Bool _ | Int _ | Float _ | String _ | Abstract _
| Sum _ | Record _ | Tuple _ | List _ | Option _ | Nullable _
| Wrap _ | Name _ | External _ -> assert false
let get_left_reader_name p name param =
let args = List.map (fun s -> Tvar (dummy_loc, s)) param in
get_reader_name p (Name (dummy_loc, name, args, None, None))
let get_left_of_string_name p name param =
let name_f s = s ^ "_of_string" in
let args = List.map (fun s -> Tvar (dummy_loc, s)) param in
get_reader_name ~name_f p (Name (dummy_loc, name, args, None, None))
let write_with_adapter adapter writer =
match adapter.Json.ocaml_adapter with
| None -> writer
| Some { restore; _ } ->
[
Line (
sprintf "Atdgen_runtime.Oj_run.write_with_adapter %s (" restore
);
Block writer;
Line ")";
]
let unwrap_f_value { Ox_emit.mapping; unwrapped; _} (p : param) =
if unwrapped then
Ocaml.unwrap_option (p.deref mapping.f_value)
else
mapping.f_value
let rec make_writer ?type_constraint p (x : Oj_mapping.t) : Indent.t list =
match x with
Unit _
| Bool _
| Int _
| Float _
| String _
| Abstract _
| Name _
| External _
| Tvar _ -> [ Line (get_writer_name p x) ]
| Sum (_, a, Sum o, Sum j) ->
let tick = Ocaml.tick o in
let open_enum = j.Json.json_open_enum in
let body : Indent.t list =
[
Line "match x with";
Block (
Array.to_list (
Array.map
(fun x -> Inline (make_variant_writer p ~tick ~open_enum x))
a
)
)
]
in
let xval =
match type_constraint with
| Some x -> sprintf "(x : %s)" x
| None -> "x"
in
let standard_writer = [
Annot ("fun", Line (sprintf "fun ob %s ->" xval));
Block body
] in
let adapter = j.json_sum_adapter in
write_with_adapter adapter standard_writer
| Record (_, a, Record o, Record j) ->
let xval =
match type_constraint with
| Some x -> sprintf "(x : %s)" x
| None -> "x"
in
let standard_writer = [
Annot ("fun", Line (sprintf "fun ob %s ->" xval));
Block (make_record_writer p a o);
] in
let adapter = j.json_record_adapter in
write_with_adapter adapter standard_writer
| Tuple (_, a, Tuple, Tuple) ->
let len = Array.length a in
let a =
Array.mapi (
fun i x ->
Inline [
Line (sprintf "(let %s = x in" (Ox_emit.nth "x" i len));
Line "(";
Block (make_writer p x.cel_value);
Line ") ob x";
Line ");"
]
) a
in
let l =
insert (Line "Buffer.add_char ob ',';") (Array.to_list a)
in
let op, cl =
if p.std then '[', ']'
else '(', ')'
in
[
Annot ("fun", Line "fun ob x ->");
Block [
Line (sprintf "Buffer.add_char ob %C;" op);
Inline l;
Line (sprintf "Buffer.add_char ob %C;" cl);
]
]
| List (loc, x, List o, List j) ->
(match j with
Array ->
let write =
match o with
List -> "Atdgen_runtime.Oj_run.write_list ("
| Array -> "Atdgen_runtime.Oj_run.write_array ("
in
[
Line write;
Block (make_writer p x);
Line ")";
]
| Object ->
let k, v = Ox_emit.get_assoc_type p.deref loc x in
let write =
match o with
List -> "Atdgen_runtime.Oj_run.write_assoc_list ("
| Array -> "Atdgen_runtime.Oj_run.write_assoc_array ("
in
[
Line write;
Block (make_writer p k);
Line ") (";
Block (make_writer p v);
Line ")";
]
)
| Option (_, x, Option, Option) ->
[
Line (sprintf "Atdgen_runtime.Oj_run.write_%soption ("
(if p.std then "std_" else ""));
Block (make_writer p x);
Line ")";
]
| Nullable (_, x, Nullable, Nullable) ->
[
Line "Atdgen_runtime.Oj_run.write_nullable (";
Block (make_writer p x);
Line ")";
]
| Wrap (_, x, Wrap o, Wrap) ->
(match o with
None -> make_writer p x
| Some { Ocaml.ocaml_unwrap; _} ->
[
Line "fun ob x -> (";
Block [
Line (sprintf "let x = ( %s ) x in (" ocaml_unwrap);
Block (make_writer p x);
Line ") ob x)";
]
]
)
| Sum _ | Record _ | Tuple _ | List _ | Option _ | Nullable _ | Wrap _ ->
assert false
and make_variant_writer p ~tick ~open_enum x : Indent.t list =
let o, j =
match x.var_arepr, x.var_brepr with
Variant o, Variant j -> o, j
| _ -> assert false
in
let ocaml_cons = o.Ocaml.ocaml_cons in
let json_cons = j.Json.json_cons in
match x.var_arg with
| None ->
let enclose s =
if p.std then s
else "<" ^ s ^ ">"
in
[
Line (sprintf "| %s%s -> Buffer.add_string ob %S"
tick ocaml_cons
(enclose (make_json_string json_cons)))
]
| Some v when open_enum ->
(* v should resolve to type string. *)
[
Line (sprintf "| %s%s x -> (" tick ocaml_cons);
Block [
Block (make_writer p v);
Line ") ob x;";
];
]
| Some (Record (_, a, Record o, Record _)) ->
(* We need a special case because inline-records cannot escape their scope. *)
let op, sep, cl =
if p.std then "[", ",", ']'
else "<", ":", '>'
in
[
Line (sprintf "| %s%s x ->" tick ocaml_cons);
Block [
Line (sprintf "Buffer.add_string ob %S;"
(op ^ make_json_string json_cons ^ sep));
Line "begin";
Block (make_record_writer p a o);
Line "end (* ob x *);";
Line (sprintf "Buffer.add_char ob %C" cl);
]
]
| Some v ->
let op, sep, cl =
if p.std then "[", ",", ']'
else "<", ":", '>'
in
[
Line (sprintf "| %s%s x ->" tick ocaml_cons);
Block [
Line (sprintf "Buffer.add_string ob %S;"
(op ^ make_json_string json_cons ^ sep));
Line "(";
Block (make_writer p v);
Line ") ob x;";
Line (sprintf "Buffer.add_char ob %C" cl);
]
]
and make_record_writer p a record_kind =
let dot = Ocaml.dot record_kind in
let fields = Ox_emit.get_fields p.deref a in
let sep =
[
Line "if !is_first then";
Block [
Line "is_first := false"
];
Line "else";
Block [
Line "Buffer.add_char ob ',';";
];
]
in
let write_fields =
List.map (
fun ({ Ox_emit.mapping ; ocaml_fname ; ocaml_default
; json_fname ; optional ; unwrapped } as field) ->
let f_value = unwrap_f_value field p in
let write_field_tag =
sprintf " Buffer.add_string ob %S;"
(make_json_string json_fname ^ ":")
in
let app v =
[
Inline sep;
Line write_field_tag;
Line "(";
Block (make_writer p f_value);
Line ")";
Block [Line (sprintf "ob %s;" v)]
]
in
let v =
if optional then
sprintf "x.%s" ocaml_fname
else
sprintf "x%s%s" dot ocaml_fname
in
let l =
if unwrapped then
[
Line (sprintf "(match %s with None -> () | Some x ->" v);
Block (app "x");
Line ");"
]
else if optional && not p.force_defaults then
[
Line (sprintf "if %s <> %s then ("
v (Option.value_exn ocaml_default));
Block (app v);
Line ");"
]
else
app v
in
Inline l
) fields
in
[
Line "Buffer.add_char ob '{';";
Line "let is_first = ref true in";
Inline write_fields;
Line "Buffer.add_char ob '}';";
]
let wrap_tmp_required_value value =
[
Line "Some (";
Block value;
Line ")";
]
let unwrap_tmp_required_value ocaml_fname var =
sprintf "(match !%s with Some x -> x \
| None -> Atdgen_runtime.Oj_run.missing_field p %S)"
var ocaml_fname
(*
Json object fields come in an arbitrary order, so we read the fields
from the input and keep their value in a temporary slot until we're done
reading the object i.e. we find a closing brace '}'. At that point,
we must have a value for each field so that we can create an OCaml
record.
Now ATD supports optional fields e.g. `?name: string option;`
as well as required fields with a default e.g. `~special : bool;`.
These two cases are handled similarly here because in each case we have
an initial value to set the field to. For these, we generate essentially
the following code:
let field_x = ref default in
For the examples above, this is:
let field_name = ref None in (* default value for option is None *)
let field_special = ref false in (* default value for bool is false *)
The third case, in which a required field has no default value such as
`id : string;`, we don't have a default value so we resort to wrapping
in an option, until we're done reading the whole json object.
Once the json object has been read, we expect to have found a value for
this field:
let field_id = ref None in (* no initial value *)
... (* read json input *)
(* construct the ocaml record: *)
{
id = (match !field_id with None -> error ... | Some value -> value);
...
}
Note that we no longer use Obj.magic to improve performance because
we don't have the resources to do so safely.
*)
let study_record ~ocaml_version fields =
let field_assignments =
List.fold_right (
fun { Ox_emit.ocaml_fname ; ocaml_default ; optional ; _ }
field_assignments ->
let var = sprintf "field_%s" ocaml_fname in
let initial_value, extract_value =
match ocaml_default with
| None ->
assert (not optional);
("None",
unwrap_tmp_required_value ocaml_fname var)
| Some s ->
(s,
sprintf "!%s" var)
in
let init_tmp_field =
Line (sprintf "let %s = ref (%s) in" var initial_value)
in
let create_field =
Line (sprintf "%s = %s;" ocaml_fname extract_value)
in
(init_tmp_field, create_field) :: field_assignments
) fields []
in
let init_tmp_fields, create_record_fields = List.split field_assignments in
let create_record = [ Line "{"; Block create_record_fields; Line "}" ] in
init_tmp_fields, create_record
let read_with_adapter adapter reader =
match adapter.Json.ocaml_adapter with
| None -> reader
| Some { normalize; _ } ->
[
Line (
sprintf "Atdgen_runtime.Oj_run.read_with_adapter %s (" normalize
);
Block reader;
Line ")";
]
let rec make_reader p type_annot (x : Oj_mapping.t) : Indent.t list =
match x with
Unit _
| Bool _
| Int _
| Float _
| String _
| Abstract _
| Name _
| External _
| Tvar _ -> [ Line (get_reader_name p x) ]
| Sum (_, a, Sum o, Sum j) ->
let tick = Ocaml.tick o in
let open_enum = j.Json.json_open_enum in
let l = Array.to_list a in
let fallback_expr =
[ Line "Atdgen_runtime.Oj_run.invalid_variant_tag p x" ]
in
let cases =
make_cases_reader p type_annot
~tick ~open_enum ~std:false ~fallback_expr l
in
let l0, l1 =
List.partition (fun x -> x.var_arg = None || open_enum) l
in
let cases0 =
make_cases_reader p type_annot
~tick ~open_enum ~std:true ~fallback_expr l0
in
let cases1 =
make_cases_reader p type_annot
~tick ~open_enum ~std:true ~fallback_expr l1
in
let read_tag =
[
Line "Yojson.Safe.read_space p lb;";
Line "match Yojson.Safe.start_any_variant p lb with";
Block [
Line "| `Edgy_bracket -> (";
Block [
Block [
Line "match Yojson.Safe.read_ident p lb with";
Block cases;
];
Line ")";
];
Line "| `Double_quote -> (";
Block [
Block [
Line "match Yojson.Safe.finish_string p lb with";
Block cases0;
];
Line ")";
];
Line "| `Square_bracket -> (";
Block [
Block [
Line "match Atdgen_runtime.Oj_run.read_string p lb with";
Block cases1;
];
Line ")";
];
];
]
in
let standard_reader = [
Annot ("fun", Line "fun p lb ->");
Block [
Inline read_tag;
]
] in
let adapter = j.json_sum_adapter in
read_with_adapter adapter standard_reader
| Record (loc, a, Record o, Record j) ->
Ocaml.obj_unimplemented loc o;
let standard_reader = [
Annot ("fun", Line "fun p lb ->");
Block (make_record_reader p type_annot loc a j)
] in
let adapter = j.json_record_adapter in
read_with_adapter adapter standard_reader
| Tuple (_, a, Tuple, Tuple) ->
[
Annot ("fun", Line "fun p lb ->");
Block (make_tuple_reader p a);
]
| List (loc, x, List o, List j) ->
(match j with
Array ->
let read =
match o with
List -> "Atdgen_runtime.Oj_run.read_list ("
| Array -> "Atdgen_runtime.Oj_run.read_array ("
in
[
Line read;
Block (make_reader p None x);
Line ")";
]
| Object ->
let k, v = Ox_emit.get_assoc_type p.deref loc x in
let read =
match o with
List -> "Atdgen_runtime.Oj_run.read_assoc_list ("
| Array -> "Atdgen_runtime.Oj_run.read_assoc_array ("
in
[
Line read;
Block (make_reader p None k);
Line ") (";
Block (make_reader p None v);
Line ")";
]
)
| Option (loc, x, Option, Option) ->
let a = [|
{
var_loc = loc;
var_cons = "None";
var_arg = None;
var_arepr = Ocaml.Repr.Variant { Ocaml.ocaml_cons = "None";
ocaml_vdoc = None };
var_brepr = Json.Variant { Json.json_cons = "None" };
};
{
var_loc = loc;
var_cons = "Some";
var_arg = Some x;
var_arepr = Ocaml.Repr.Variant { Ocaml.ocaml_cons = "Some";
ocaml_vdoc = None };
var_brepr = Json.Variant { Json.json_cons = "Some" };
};
|]
in
let json_options = {
Json.json_sum_adapter = Json.no_adapter;
json_open_enum = false;
} in
make_reader p
(Some "_ option")
(Sum (loc, a, Sum Classic, Json.Sum json_options))
| Nullable (_, x, Nullable, Nullable) ->
[
Line "fun p lb ->";
Block [
Line "Yojson.Safe.read_space p lb;";
Line "(if Yojson.Safe.read_null_if_possible p lb then None";
Line "else Some ((";
Block (make_reader p None x);
Line ") p lb) : _ option)"
]
]
| Wrap (_, x, Wrap o, Wrap) ->
(match o with
None -> make_reader p type_annot x
| Some { Ocaml.ocaml_wrap; _ } ->
[
Line "fun p lb ->";
Block [
Line "let x = (";
Block (make_reader p type_annot x);
Line ") p lb in";
Line (sprintf "( %s ) x" ocaml_wrap);
]
]
)
| Sum _ | Record _ | Tuple _ | List _ | Option _ | Nullable _ | Wrap _ ->
assert false
(*
Return a pair (optional json constructor, expression) to be converted
into a match case.
If the json constructor is missing, this indicates a catch-all
pattern (_).
*)
and make_case_reader
p type_annot ~tick ~open_enum ~std
(x : Oj_mapping.variant_mapping) : (string option * Indent.t list) =
let o, j =
match x.var_arepr, x.var_brepr with
| Variant o, Variant j -> o, j
| _ -> assert false
in
let ocaml_cons = o.Ocaml.ocaml_cons in
let json_cons = j.Json.json_cons in
let catch_all, expr =
match x.var_arg with
| None ->
let expr =
if std then
[
Line (Ox_emit.opt_annot
type_annot (sprintf "%s%s" tick ocaml_cons));
]
else
[
Line "Yojson.Safe.read_space p lb;";
Line "Yojson.Safe.read_gt p lb;";
Line (Ox_emit.opt_annot
type_annot (sprintf "%s%s" tick ocaml_cons));
]
in
false, expr
| Some v when open_enum ->
let expr = [
Line (Ox_emit.opt_annot
type_annot (sprintf "%s%s x" tick ocaml_cons));
] in
true, expr
| Some v ->
let read_x, put_x =
match v with
| Record (loc, a, Record o, Record j) ->
(* We need a special case for inline-records: *)
let create_record_prefix = sprintf "%s%s" tick ocaml_cons in
Inline [
Line "let x = (";
Block (make_record_reader ~create_record_prefix p type_annot loc a j);
Line ") in";
],
Line "x"
| other ->
Inline [
Line "let x = (";
Block [
Block (make_reader p None other);
Line ") p lb";
];
Line "in";
],
Line (Ox_emit.opt_annot
type_annot (sprintf "%s%s x" tick ocaml_cons));
in
let expr =
if std then
[
Line "Yojson.Safe.read_space p lb;";
Line "Yojson.Safe.read_comma p lb;";
Line "Yojson.Safe.read_space p lb;";
read_x;
Line "Yojson.Safe.read_space p lb;";
Line "Yojson.Safe.read_rbr p lb;";
put_x;
]
else
[
Line "Atdgen_runtime.Oj_run.read_until_field_value p lb;";
read_x;
Line "Yojson.Safe.read_space p lb;";
Line "Yojson.Safe.read_gt p lb;";
put_x;
]
in
false, expr
in
let opt_json_cons =
if catch_all then None
else Some json_cons
in
(opt_json_cons, expr)
and make_cases_reader p type_annot ~tick ~open_enum ~std ~fallback_expr l =
let cases =
List.map
(make_case_reader p type_annot ~tick ~open_enum ~std)
l
in
let specific_cases, catch_alls =
List.partition (function (None, _) -> false | _ -> true) cases
in
let catch_all =
match catch_alls with
| [] ->
[
Line "| x ->";
Block fallback_expr;
]
| [(_, expr)] ->
[
Line "| x ->";
Block expr;
]
| _ ->
assert false
in
let all_cases =
List.map (function
| Some json_cons, expr ->
Inline [
Line (sprintf "| %S ->" json_cons);
Block expr;
]
| _ -> assert false
) specific_cases
in
all_cases @ catch_all
and make_record_reader ?(create_record_prefix = "") p type_annot loc a json_options =
let keep_nulls = json_options.json_keep_nulls in
let fields = Ox_emit.get_fields p.deref a in
let init_fields, create_record =
study_record ~ocaml_version:p.ocaml_version fields
in
let read_field =
let a = Array.of_list fields in
let cases =
Array.mapi (
fun i ({ Ox_emit.mapping ; ocaml_fname ; json_fname ; optional
; unwrapped ; ocaml_default = _ } as field) ->
let f_value = unwrap_f_value field p in
let wrap l =
if unwrapped then
[
Line "Some (";
Block l;
Line ")"
]
else l
in
let read_value =
[
Line "(";
Block (make_reader p None f_value);
Line ") p lb";
]
in
let read_value =
if optional then read_value
else wrap_tmp_required_value read_value
in
let expr =
[
Line (sprintf "field_%s := (" ocaml_fname);
Block (wrap read_value);
Line ");";
]
in
let opt_expr =
if optional && not keep_nulls then
(* treat fields with null values as missing fields
(atdgen's default) *)
[
Line "if not (Yojson.Safe.read_null_if_possible p lb) \