aboutsummaryrefslogtreecommitdiffstats
path: root/lib/stdlib/src/erl_parse.yrl
blob: c04a1aeb897c74bb1f557d4f87d3a83e35a77137 (plain) (blame)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
%% -*- erlang -*-
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2013. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%

%% Definition of the Erlang grammar.

Nonterminals
form
attribute attr_val
function function_clauses function_clause
clause_args clause_guard clause_body
expr expr_100 expr_150 expr_160 expr_200 expr_300 expr_400 expr_500
expr_600 expr_700 expr_800
expr_max
list tail
list_comprehension lc_expr lc_exprs
binary_comprehension
tuple
%struct
record_expr record_tuple record_field record_fields
map_expr map_tuple map_field map_field_assoc map_field_exact map_fields map_key
if_expr if_clause if_clauses case_expr cr_clause cr_clauses receive_expr
fun_expr fun_clause fun_clauses atom_or_var integer_or_var
try_expr try_catch try_clause try_clauses
function_call argument_list
exprs guard
atomic strings
prefix_op mult_op add_op list_op comp_op
rule rule_clauses rule_clause rule_body
binary bin_elements bin_element bit_expr
opt_bit_size_expr bit_size_expr opt_bit_type_list bit_type_list bit_type
top_type top_type_100 top_types type typed_expr typed_attr_val
type_sig type_sigs type_guard type_guards fun_type fun_type_100 binary_type
type_spec spec_fun typed_exprs typed_record_fields field_types field_type
bin_base_type bin_unit_type type_200 type_300 type_400 type_500.

Terminals
char integer float atom string var

'(' ')' ',' '->' ':-' '{' '}' '[' ']' '|' '||' '<-' ';' ':' '#' '.'
'after' 'begin' 'case' 'try' 'catch' 'end' 'fun' 'if' 'of' 'receive' 'when'
'andalso' 'orelse'
'bnot' 'not'
'*' '/' 'div' 'rem' 'band' 'and'
'+' '-' 'bor' 'bxor' 'bsl' 'bsr' 'or' 'xor'
'++' '--'
'==' '/=' '=<' '<' '>=' '>' '=:=' '=/=' '<=' '=>' ':='
'<<' '>>'
'!' '=' '::' '..' '...'
'spec' 'callback' % helper
dot.

Expect 2.

Rootsymbol form.

form -> attribute dot : '$1'.
form -> function dot : '$1'.
form -> rule dot : '$1'.

attribute -> '-' atom attr_val               : build_attribute('$2', '$3').
attribute -> '-' atom typed_attr_val         : build_typed_attribute('$2','$3').
attribute -> '-' atom '(' typed_attr_val ')' : build_typed_attribute('$2','$4').
attribute -> '-' 'spec' type_spec            : build_type_spec('$2', '$3').
attribute -> '-' 'callback' type_spec        : build_type_spec('$2', '$3').

type_spec -> spec_fun type_sigs : {'$1', '$2'}.
type_spec -> '(' spec_fun type_sigs ')' : {'$2', '$3'}.

spec_fun ->                           atom : '$1'.
spec_fun ->                  atom ':' atom : {'$1', '$3'}.
%% The following two are retained only for backwards compatibility;
%% they are not part of the EEP syntax and should be removed.
spec_fun ->          atom '/' integer '::' : {'$1', '$3'}.
spec_fun -> atom ':' atom '/' integer '::' : {'$1', '$3', '$5'}.

typed_attr_val -> expr ',' typed_record_fields : {typed_record, '$1', '$3'}.
typed_attr_val -> expr '::' top_type           : {type_def, '$1', '$3'}.

typed_record_fields -> '{' typed_exprs '}' : {tuple, ?line('$1'), '$2'}.

typed_exprs -> typed_expr                 : ['$1'].
typed_exprs -> typed_expr ',' typed_exprs : ['$1'|'$3'].
typed_exprs -> expr ',' typed_exprs       : ['$1'|'$3'].
typed_exprs -> typed_expr ',' exprs       : ['$1'|'$3'].

typed_expr -> expr '::' top_type          : {typed,'$1','$3'}.

type_sigs -> type_sig                     : ['$1'].
type_sigs -> type_sig ';' type_sigs       : ['$1'|'$3'].

type_sig -> fun_type                      : '$1'.
type_sig -> fun_type 'when' type_guards   : {type, ?line('$1'), bounded_fun,
                                             ['$1','$3']}.

type_guards -> type_guard                 : ['$1'].
type_guards -> type_guard ',' type_guards : ['$1'|'$3'].

type_guard -> atom '(' top_types ')'      : {type, ?line('$1'), constraint,
                                             ['$1', '$3']}.
type_guard -> var '::' top_type           : build_def('$1', '$3').

top_types -> top_type                     : ['$1'].
top_types -> top_type ',' top_types       : ['$1'|'$3'].

top_type -> var '::' top_type_100         : {ann_type, ?line('$1'), ['$1','$3']}.
top_type -> top_type_100                  : '$1'.

top_type_100 -> type_200                  : '$1'.
top_type_100 -> type_200 '|' top_type_100 : lift_unions('$1','$3').

type_200 -> type_300 '..' type_300        : {type, ?line('$1'), range,
                                             [skip_paren('$1'),
                                              skip_paren('$3')]}.
type_200 -> type_300                      : '$1'.

type_300 -> type_300 add_op type_400      : ?mkop2(skip_paren('$1'),
                                                   '$2', skip_paren('$3')).
type_300 -> type_400                      : '$1'.

type_400 -> type_400 mult_op type_500     : ?mkop2(skip_paren('$1'),
                                                   '$2', skip_paren('$3')).
type_400 -> type_500                      : '$1'.

type_500 -> prefix_op type                : ?mkop1('$1', skip_paren('$2')).
type_500 -> type                          : '$1'.

type -> '(' top_type ')'                  : {paren_type, ?line('$2'), ['$2']}.
type -> var                               : '$1'.
type -> atom                              : '$1'.
type -> atom '(' ')'                      : build_gen_type('$1').
type -> atom '(' top_types ')'            : {type, ?line('$1'),
                                             normalise('$1'), '$3'}.
type -> atom ':' atom '(' ')'             : {remote_type, ?line('$1'),
                                             ['$1', '$3', []]}.
type -> atom ':' atom '(' top_types ')'   : {remote_type, ?line('$1'),
                                             ['$1', '$3', '$5']}.
type -> '[' ']'                           : {type, ?line('$1'), nil, []}.
type -> '[' top_type ']'                  : {type, ?line('$1'), list, ['$2']}.
type -> '[' top_type ',' '...' ']'        : {type, ?line('$1'),
                                             nonempty_list, ['$2']}.
type -> '{' '}'                           : {type, ?line('$1'), tuple, []}.
type -> '{' top_types '}'                 : {type, ?line('$1'), tuple, '$2'}.
type -> '#' atom '{' '}'                  : {type, ?line('$1'), record, ['$2']}.
type -> '#' atom '{' field_types '}'      : {type, ?line('$1'),
                                             record, ['$2'|'$4']}.
type -> binary_type                       : '$1'.
type -> integer                           : '$1'.
type -> 'fun' '(' ')'                     : {type, ?line('$1'), 'fun', []}.
type -> 'fun' '(' fun_type_100 ')'        : '$3'.

fun_type_100 -> '(' '...' ')' '->' top_type
                                          : {type, ?line('$1'), 'fun',
                                             [{type, ?line('$1'), any}, '$5']}.
fun_type_100 -> fun_type                  : '$1'.

fun_type -> '(' ')' '->' top_type  : {type, ?line('$1'), 'fun',
                                      [{type, ?line('$1'), product, []}, '$4']}.
fun_type -> '(' top_types ')' '->' top_type
                                   : {type, ?line('$1'), 'fun',
                                      [{type, ?line('$1'), product, '$2'},'$5']}.

field_types -> field_type                 : ['$1'].
field_types -> field_type ',' field_types : ['$1'|'$3'].

field_type -> atom '::' top_type          : {type, ?line('$1'), field_type,
                                             ['$1', '$3']}.

binary_type -> '<<' '>>'                  : {type, ?line('$1'),binary,
					     [abstract(0, ?line('$1')),
					      abstract(0, ?line('$1'))]}.
binary_type -> '<<' bin_base_type '>>'    : {type, ?line('$1'),binary,
					     ['$2', abstract(0, ?line('$1'))]}.
binary_type -> '<<' bin_unit_type '>>'    : {type, ?line('$1'),binary,
                                             [abstract(0, ?line('$1')), '$2']}.
binary_type -> '<<' bin_base_type ',' bin_unit_type '>>'
                                    : {type, ?line('$1'), binary, ['$2', '$4']}.

bin_base_type -> var ':' type          : build_bin_type(['$1'], '$3').

bin_unit_type -> var ':' var '*' type  : build_bin_type(['$1', '$3'], '$5').

attr_val -> expr                     : ['$1'].
attr_val -> expr ',' exprs           : ['$1' | '$3'].
attr_val -> '(' expr ',' exprs ')'   : ['$2' | '$4'].

function -> function_clauses : build_function('$1').

function_clauses -> function_clause : ['$1'].
function_clauses -> function_clause ';' function_clauses : ['$1'|'$3'].

function_clause -> atom clause_args clause_guard clause_body :
	{clause,?line('$1'),element(3, '$1'),'$2','$3','$4'}.


clause_args -> argument_list : element(1, '$1').

clause_guard -> 'when' guard : '$2'.
clause_guard -> '$empty' : [].

clause_body -> '->' exprs: '$2'.


expr -> 'catch' expr : {'catch',?line('$1'),'$2'}.
expr -> expr_100 : '$1'.

expr_100 -> expr_150 '=' expr_100 : {match,?line('$2'),'$1','$3'}.
expr_100 -> expr_150 '!' expr_100 : ?mkop2('$1', '$2', '$3').
expr_100 -> expr_150 : '$1'.

expr_150 -> expr_160 'orelse' expr_150 : ?mkop2('$1', '$2', '$3').
expr_150 -> expr_160 : '$1'.

expr_160 -> expr_200 'andalso' expr_160 : ?mkop2('$1', '$2', '$3').
expr_160 -> expr_200 : '$1'.

expr_200 -> expr_300 comp_op expr_300 :
	?mkop2('$1', '$2', '$3').
expr_200 -> expr_300 : '$1'.

expr_300 -> expr_400 list_op expr_300 :
	?mkop2('$1', '$2', '$3').
expr_300 -> expr_400 : '$1'.

expr_400 -> expr_400 add_op expr_500 :
	?mkop2('$1', '$2', '$3').
expr_400 -> expr_500 : '$1'.

expr_500 -> expr_500 mult_op expr_600 :
	?mkop2('$1', '$2', '$3').
expr_500 -> expr_600 : '$1'.

expr_600 -> prefix_op expr_700 :
	?mkop1('$1', '$2').
expr_600 -> map_expr : '$1'.
expr_600 -> expr_700 : '$1'.

expr_700 -> function_call : '$1'.
expr_700 -> record_expr : '$1'.
expr_700 -> expr_800 : '$1'.

expr_800 -> expr_max ':' expr_max :
	{remote,?line('$2'),'$1','$3'}.
expr_800 -> expr_max : '$1'.

expr_max -> var : '$1'.
expr_max -> atomic : '$1'.
expr_max -> list : '$1'.
expr_max -> binary : '$1'.
expr_max -> list_comprehension : '$1'.
expr_max -> binary_comprehension : '$1'.
expr_max -> tuple : '$1'.
%%expr_max -> struct : '$1'.
expr_max -> '(' expr ')' : '$2'.
expr_max -> 'begin' exprs 'end' : {block,?line('$1'),'$2'}.
expr_max -> if_expr : '$1'.
expr_max -> case_expr : '$1'.
expr_max -> receive_expr : '$1'.
expr_max -> fun_expr : '$1'.
expr_max -> try_expr : '$1'.


list -> '[' ']' : {nil,?line('$1')}.
list -> '[' expr tail : {cons,?line('$1'),'$2','$3'}.

tail -> ']' : {nil,?line('$1')}.
tail -> '|' expr ']' : '$2'.
tail -> ',' expr tail : {cons,?line('$2'),'$2','$3'}.


binary -> '<<' '>>' : {bin,?line('$1'),[]}.
binary -> '<<' bin_elements '>>' : {bin,?line('$1'),'$2'}.

bin_elements -> bin_element : ['$1'].
bin_elements -> bin_element ',' bin_elements : ['$1'|'$3'].

bin_element -> bit_expr opt_bit_size_expr opt_bit_type_list :
	{bin_element,?line('$1'),'$1','$2','$3'}.

bit_expr -> prefix_op expr_max : ?mkop1('$1', '$2').
bit_expr -> expr_max : '$1'.

opt_bit_size_expr -> ':' bit_size_expr : '$2'.
opt_bit_size_expr -> '$empty' : default.

opt_bit_type_list -> '/' bit_type_list : '$2'.
opt_bit_type_list -> '$empty' : default.

bit_type_list -> bit_type '-' bit_type_list : ['$1' | '$3'].
bit_type_list -> bit_type : ['$1'].

bit_type -> atom             : element(3,'$1').
bit_type -> atom ':' integer : { element(3,'$1'), element(3,'$3') }.

bit_size_expr -> expr_max : '$1'.


list_comprehension -> '[' expr '||' lc_exprs ']' :
	{lc,?line('$1'),'$2','$4'}.
binary_comprehension -> '<<' binary '||' lc_exprs '>>' :
	{bc,?line('$1'),'$2','$4'}.
lc_exprs -> lc_expr : ['$1'].
lc_exprs -> lc_expr ',' lc_exprs : ['$1'|'$3'].

lc_expr -> expr : '$1'.
lc_expr -> expr '<-' expr : {generate,?line('$2'),'$1','$3'}.
lc_expr -> binary '<=' expr : {b_generate,?line('$2'),'$1','$3'}.

tuple -> '{' '}' : {tuple,?line('$1'),[]}.
tuple -> '{' exprs '}' : {tuple,?line('$1'),'$2'}.


%%struct -> atom tuple :
%%	{struct,?line('$1'),element(3, '$1'),element(3, '$2')}.

map_expr -> '#' map_tuple :
	{map, ?line('$1'),'$2'}.
map_expr -> expr_max '#' map_tuple :
	{map, ?line('$2'),'$1','$3'}.
map_expr -> map_expr '#' map_tuple :
	{map, ?line('$2'),'$1','$3'}.

map_tuple -> '{' '}' : [].
map_tuple -> '{' map_fields '}' : '$2'.

map_fields -> map_field : ['$1'].
map_fields -> map_field ',' map_fields : ['$1' | '$3'].

map_field -> map_field_assoc : '$1'.
map_field -> map_field_exact : '$1'.

map_field_assoc -> map_key '=>' expr :
	{map_field_assoc,?line('$1'),'$1','$3'}.

map_field_exact -> map_key ':=' expr :
	{map_field_exact,?line('$1'),'$1','$3'}.

map_key -> expr : '$1'.


%% N.B. This is called from expr_700.
%% N.B. Field names are returned as the complete object, even if they are
%% always atoms for the moment, this might change in the future.

record_expr -> '#' atom '.' atom :
	{record_index,?line('$1'),element(3, '$2'),'$4'}.
record_expr -> '#' atom record_tuple :
	{record,?line('$1'),element(3, '$2'),'$3'}.
record_expr -> expr_max '#' atom '.' atom :
	{record_field,?line('$2'),'$1',element(3, '$3'),'$5'}.
record_expr -> expr_max '#' atom record_tuple :
	{record,?line('$2'),'$1',element(3, '$3'),'$4'}.
record_expr -> record_expr '#' atom '.' atom :
	{record_field,?line('$2'),'$1',element(3, '$3'),'$5'}.
record_expr -> record_expr '#' atom record_tuple :
	{record,?line('$2'),'$1',element(3, '$3'),'$4'}.

record_tuple -> '{' '}' : [].
record_tuple -> '{' record_fields '}' : '$2'.

record_fields -> record_field : ['$1'].
record_fields -> record_field ',' record_fields : ['$1' | '$3'].

record_field -> var '=' expr : {record_field,?line('$1'),'$1','$3'}.
record_field -> atom '=' expr : {record_field,?line('$1'),'$1','$3'}.

%% N.B. This is called from expr_700.

function_call -> expr_800 argument_list :
	{call,?line('$1'),'$1',element(1, '$2')}.


if_expr -> 'if' if_clauses 'end' : {'if',?line('$1'),'$2'}.

if_clauses -> if_clause : ['$1'].
if_clauses -> if_clause ';' if_clauses : ['$1' | '$3'].

if_clause -> guard clause_body :
	{clause,?line(hd(hd('$1'))),[],'$1','$2'}.


case_expr -> 'case' expr 'of' cr_clauses 'end' :
	{'case',?line('$1'),'$2','$4'}.

cr_clauses -> cr_clause : ['$1'].
cr_clauses -> cr_clause ';' cr_clauses : ['$1' | '$3'].

cr_clause -> expr clause_guard clause_body :
	{clause,?line('$1'),['$1'],'$2','$3'}.

receive_expr -> 'receive' cr_clauses 'end' :
	{'receive',?line('$1'),'$2'}.
receive_expr -> 'receive' 'after' expr clause_body 'end' :
	{'receive',?line('$1'),[],'$3','$4'}.
receive_expr -> 'receive' cr_clauses 'after' expr clause_body 'end' :
	{'receive',?line('$1'),'$2','$4','$5'}.


fun_expr -> 'fun' atom '/' integer :
	{'fun',?line('$1'),{function,element(3, '$2'),element(3, '$4')}}.
fun_expr -> 'fun' atom_or_var ':' atom_or_var '/' integer_or_var :
	{'fun',?line('$1'),{function,'$2','$4','$6'}}.
fun_expr -> 'fun' fun_clauses 'end' :
	build_fun(?line('$1'), '$2').

atom_or_var -> atom : '$1'.
atom_or_var -> var : '$1'.

integer_or_var -> integer : '$1'.
integer_or_var -> var : '$1'.

fun_clauses -> fun_clause : ['$1'].
fun_clauses -> fun_clause ';' fun_clauses : ['$1' | '$3'].

fun_clause -> argument_list clause_guard clause_body :
	{Args,Pos} = '$1',
	{clause,Pos,'fun',Args,'$2','$3'}.

fun_clause -> var argument_list clause_guard clause_body :
	{clause,element(2, '$1'),element(3, '$1'),element(1, '$2'),'$3','$4'}.

try_expr -> 'try' exprs 'of' cr_clauses try_catch :
	build_try(?line('$1'),'$2','$4','$5').
try_expr -> 'try' exprs try_catch :
	build_try(?line('$1'),'$2',[],'$3').

try_catch -> 'catch' try_clauses 'end' :
	{'$2',[]}.
try_catch -> 'catch' try_clauses 'after' exprs 'end' :
	{'$2','$4'}.
try_catch -> 'after' exprs 'end' :
	{[],'$2'}.

try_clauses -> try_clause : ['$1'].
try_clauses -> try_clause ';' try_clauses : ['$1' | '$3'].

try_clause -> expr clause_guard clause_body :
	L = ?line('$1'),
	{clause,L,[{tuple,L,[{atom,L,throw},'$1',{var,L,'_'}]}],'$2','$3'}.
try_clause -> atom ':' expr clause_guard clause_body :
	L = ?line('$1'),
	{clause,L,[{tuple,L,['$1','$3',{var,L,'_'}]}],'$4','$5'}.
try_clause -> var ':' expr clause_guard clause_body :
	L = ?line('$1'),
	{clause,L,[{tuple,L,['$1','$3',{var,L,'_'}]}],'$4','$5'}.


argument_list -> '(' ')' : {[],?line('$1')}.
argument_list -> '(' exprs ')' : {'$2',?line('$1')}.


exprs -> expr : ['$1'].
exprs -> expr ',' exprs : ['$1' | '$3'].

guard -> exprs : ['$1'].
guard -> exprs ';' guard : ['$1'|'$3'].

atomic -> char : '$1'.
atomic -> integer : '$1'.
atomic -> float : '$1'.
atomic -> atom : '$1'.
atomic -> strings : '$1'.

strings -> string : '$1'.
strings -> string strings :
	{string,?line('$1'),element(3, '$1') ++ element(3, '$2')}.

prefix_op -> '+' : '$1'.
prefix_op -> '-' : '$1'.
prefix_op -> 'bnot' : '$1'.
prefix_op -> 'not' : '$1'.

mult_op -> '/' : '$1'.
mult_op -> '*' : '$1'.
mult_op -> 'div' : '$1'.
mult_op -> 'rem' : '$1'.
mult_op -> 'band' : '$1'.
mult_op -> 'and' : '$1'.

add_op -> '+' : '$1'.
add_op -> '-' : '$1'.
add_op -> 'bor' : '$1'.
add_op -> 'bxor' : '$1'.
add_op -> 'bsl' : '$1'.
add_op -> 'bsr' : '$1'.
add_op -> 'or' : '$1'.
add_op -> 'xor' : '$1'.

list_op -> '++' : '$1'.
list_op -> '--' : '$1'.

comp_op -> '==' : '$1'.
comp_op -> '/=' : '$1'.
comp_op -> '=<' : '$1'.
comp_op -> '<' : '$1'.
comp_op -> '>=' : '$1'.
comp_op -> '>' : '$1'.
comp_op -> '=:=' : '$1'.
comp_op -> '=/=' : '$1'.

rule -> rule_clauses : build_rule('$1').

rule_clauses -> rule_clause : ['$1'].
rule_clauses -> rule_clause ';' rule_clauses : ['$1'|'$3'].

rule_clause -> atom clause_args clause_guard rule_body :
	{clause,?line('$1'),element(3, '$1'),'$2','$3','$4'}.

rule_body -> ':-' lc_exprs: '$2'.


Erlang code.

-export([parse_form/1,parse_exprs/1,parse_term/1]).
-export([normalise/1,abstract/1,tokens/1,tokens/2]).
-export([abstract/2]).
-export([inop_prec/1,preop_prec/1,func_prec/0,max_prec/0]).
-export([set_line/2,get_attribute/2,get_attributes/1]).

%% The following directive is needed for (significantly) faster compilation
%% of the generated .erl file by the HiPE compiler.  Please do not remove.
-compile([{hipe,[{regalloc,linear_scan}]}]).

-export_type([abstract_clause/0, abstract_expr/0, abstract_form/0,
              error_info/0]).

-type abstract_clause() :: term().
-type abstract_expr() :: term().
-type abstract_form() :: term().
-type error_description() :: term().
-type error_info() :: {erl_scan:line(), module(), error_description()}.
-type token() :: erl_scan:token().

%% mkop(Op, Arg) -> {op,Line,Op,Arg}.
%% mkop(Left, Op, Right) -> {op,Line,Op,Left,Right}.

-define(mkop2(L, OpPos, R),
        begin
            {Op,Pos} = OpPos,
            {op,Pos,Op,L,R}
        end).

-define(mkop1(OpPos, A),
        begin
            {Op,Pos} = OpPos,
            {op,Pos,Op,A}
        end).

%% keep track of line info in tokens
-define(line(Tup), element(2, Tup)).

%% Entry points compatible to old erl_parse.
%% These really suck and are only here until Calle gets multiple
%% entry points working.

-spec parse_form(Tokens) -> {ok, AbsForm} | {error, ErrorInfo} when
      Tokens :: [token()],
      AbsForm :: abstract_form(),
      ErrorInfo :: error_info().
parse_form([{'-',L1},{atom,L2,spec}|Tokens]) ->
    parse([{'-',L1},{'spec',L2}|Tokens]);
parse_form([{'-',L1},{atom,L2,callback}|Tokens]) ->
    parse([{'-',L1},{'callback',L2}|Tokens]);
parse_form(Tokens) ->
    parse(Tokens).

-spec parse_exprs(Tokens) -> {ok, ExprList} | {error, ErrorInfo} when
      Tokens :: [token()],
      ExprList :: [abstract_expr()],
      ErrorInfo :: error_info().
parse_exprs(Tokens) ->
    case parse([{atom,0,f},{'(',0},{')',0},{'->',0}|Tokens]) of
	{ok,{function,_Lf,f,0,[{clause,_Lc,[],[],Exprs}]}} ->
	    {ok,Exprs};
	{error,_} = Err -> Err
    end.

-spec parse_term(Tokens) -> {ok, Term} | {error, ErrorInfo} when
      Tokens :: [token()],
      Term :: term(),
      ErrorInfo :: error_info().
parse_term(Tokens) ->
    case parse([{atom,0,f},{'(',0},{')',0},{'->',0}|Tokens]) of
	{ok,{function,_Lf,f,0,[{clause,_Lc,[],[],[Expr]}]}} ->
	    try normalise(Expr) of
		Term -> {ok,Term}
	    catch
		_:_R -> {error,{?line(Expr),?MODULE,"bad term"}}
	    end;
	{ok,{function,_Lf,f,0,[{clause,_Lc,[],[],[_E1,E2|_Es]}]}} ->
	    {error,{?line(E2),?MODULE,"bad term"}};
	{error,_} = Err -> Err
    end.

-type attributes() :: 'export' | 'file' | 'import' | 'module'
		    | 'opaque' | 'record' | 'type'.

build_typed_attribute({atom,La,record},
		      {typed_record, {atom,_Ln,RecordName}, RecTuple}) ->
    {attribute,La,record,{RecordName,record_tuple(RecTuple)}};
build_typed_attribute({atom,La,Attr},
                      {type_def, {call,_,{atom,_,TypeName},Args}, Type})
  when Attr =:= 'type' ; Attr =:= 'opaque' ->
    case lists:all(fun({var, _, _}) -> true;
                      (_)           -> false
                   end, Args) of
        true -> {attribute,La,Attr,{TypeName,Type,Args}};
        false -> error_bad_decl(La, Attr)
    end;
build_typed_attribute({atom,La,Attr},_) ->
    case Attr of
        record -> error_bad_decl(La, record);
        type   -> error_bad_decl(La, type);
	opaque -> error_bad_decl(La, opaque);
        _      -> ret_err(La, "bad attribute")
    end.

build_type_spec({Kind,La}, {SpecFun, TypeSpecs})
  when (Kind =:= spec) or (Kind =:= callback) ->
    NewSpecFun =
	case SpecFun of
	    {atom, _, Fun} ->
		{Fun, find_arity_from_specs(TypeSpecs)};
	    {{atom,_, Mod}, {atom,_, Fun}} ->
		{Mod,Fun,find_arity_from_specs(TypeSpecs)};
	    {{atom, _, Fun}, {integer, _, Arity}} ->
		%% Old style spec. Allow this for now.
		{Fun,Arity};
	    {{atom,_, Mod}, {atom, _, Fun}, {integer, _, Arity}} ->
		%% Old style spec. Allow this for now.
		{Mod,Fun,Arity}
	    end,
    {attribute,La,Kind,{NewSpecFun, TypeSpecs}}.

find_arity_from_specs([Spec|_]) ->
    %% Use the first spec to find the arity. If all are not the same,
    %% erl_lint will find this.
    Fun = case Spec of
	      {type, _, bounded_fun, [F, _]} -> F;
	      {type, _, 'fun', _} = F -> F
	  end,
    {type, _, 'fun', [{type, _, product, Args},_]} = Fun,
    length(Args).

build_def(LHS, Types) ->
    IsSubType = {atom, ?line(LHS), is_subtype},
    {type, ?line(LHS), constraint, [IsSubType, [LHS, Types]]}.

lift_unions(T1, {type, _La, union, List}) ->
    {type, ?line(T1), union, [T1|List]};
lift_unions(T1, T2) ->
    {type, ?line(T1), union, [T1, T2]}.

skip_paren({paren_type,_L,[Type]}) ->
    skip_paren(Type);
skip_paren(Type) ->
    Type.

build_gen_type({atom, La, tuple}) ->
    {type, La, tuple, any};
build_gen_type({atom, La, Name}) ->
    {type, La, Name, []}.

build_bin_type([{var, _, '_'}|Left], Int) ->
    build_bin_type(Left, Int);
build_bin_type([], Int) ->
    skip_paren(Int);
build_bin_type([{var, La, _}|_], _) ->
    ret_err(La, "Bad binary type").

%% build_attribute(AttrName, AttrValue) ->
%%	{attribute,Line,module,Module}
%%	{attribute,Line,export,Exports}
%%	{attribute,Line,import,Imports}
%%	{attribute,Line,record,{Name,Inits}}
%%	{attribute,Line,file,{Name,Line}}
%%	{attribute,Line,Name,Val}

build_attribute({atom,La,module}, Val) ->
    case Val of
	[{atom,_Lm,Module}] ->
	    {attribute,La,module,Module};
	[{atom,_Lm,Module},ExpList] ->
	    {attribute,La,module,{Module,var_list(ExpList)}};
	_Other ->
	    error_bad_decl(La, module)
    end;
build_attribute({atom,La,export}, Val) ->
    case Val of
	[ExpList] ->
	    {attribute,La,export,farity_list(ExpList)};
	_Other -> error_bad_decl(La, export)
    end;
build_attribute({atom,La,import}, Val) ->
    case Val of
	[{atom,_Lm,Mod},ImpList] ->
	    {attribute,La,import,{Mod,farity_list(ImpList)}};
	_Other -> error_bad_decl(La, import)
    end;
build_attribute({atom,La,record}, Val) ->
    case Val of
	[{atom,_Ln,Record},RecTuple] ->
	    {attribute,La,record,{Record,record_tuple(RecTuple)}};
	_Other -> error_bad_decl(La, record)
    end;
build_attribute({atom,La,file}, Val) ->
    case Val of
	[{string,_Ln,Name},{integer,_Ll,Line}] ->
	    {attribute,La,file,{Name,Line}};
	_Other -> error_bad_decl(La, file)
    end;
build_attribute({atom,La,Attr}, Val) ->
    case Val of
	[Expr0] ->
	    Expr = attribute_farity(Expr0),
	    {attribute,La,Attr,term(Expr)};
	_Other -> ret_err(La, "bad attribute")
    end.

var_list({cons,_Lc,{var,_,V},Tail}) ->
    [V|var_list(Tail)];
var_list({nil,_Ln}) -> [];
var_list(Other) ->
    ret_err(?line(Other), "bad variable list").

attribute_farity({cons,L,H,T}) ->
    {cons,L,attribute_farity(H),attribute_farity(T)};
attribute_farity({tuple,L,Args0}) ->
    Args = attribute_farity_list(Args0),
    {tuple,L,Args};
attribute_farity({op,L,'/',{atom,_,_}=Name,{integer,_,_}=Arity}) ->
    {tuple,L,[Name,Arity]};
attribute_farity(Other) -> Other.

attribute_farity_list(Args) ->
    [attribute_farity(A) || A <- Args].

-spec error_bad_decl(integer(), attributes()) -> no_return().

error_bad_decl(L, S) ->
    ret_err(L, io_lib:format("bad ~w declaration", [S])).

farity_list({cons,_Lc,{op,_Lo,'/',{atom,_La,A},{integer,_Li,I}},Tail}) ->
    [{A,I}|farity_list(Tail)];
farity_list({nil,_Ln}) -> [];
farity_list(Other) ->
    ret_err(?line(Other), "bad function arity").

record_tuple({tuple,_Lt,Fields}) ->
    record_fields(Fields);
record_tuple(Other) ->
    ret_err(?line(Other), "bad record declaration").

record_fields([{atom,La,A}|Fields]) ->
    [{record_field,La,{atom,La,A}}|record_fields(Fields)];
record_fields([{match,_Lm,{atom,La,A},Expr}|Fields]) ->
    [{record_field,La,{atom,La,A},Expr}|record_fields(Fields)];
record_fields([{typed,Expr,TypeInfo}|Fields]) ->
    [Field] = record_fields([Expr]),
    TypeInfo1 =
	case Expr of
	    {match, _, _, _} -> TypeInfo; %% If we have an initializer.
	    {atom, La, _} ->
                case has_undefined(TypeInfo) of
                    false ->
                        TypeInfo2 = maybe_add_paren(TypeInfo),
                        lift_unions(abstract(undefined, La), TypeInfo2);
                    true ->
                        TypeInfo
                end
	end,
    [{typed_record_field,Field,TypeInfo1}|record_fields(Fields)];
record_fields([Other|_Fields]) ->
    ret_err(?line(Other), "bad record field");
record_fields([]) -> [].

has_undefined({atom,_,undefined}) ->
    true;
has_undefined({ann_type,_,[_,T]}) ->
    has_undefined(T);
has_undefined({paren_type,_,[T]}) ->
    has_undefined(T);
has_undefined({type,_,union,Ts}) ->
    lists:any(fun has_undefined/1, Ts);
has_undefined(_) ->
    false.

maybe_add_paren({ann_type,L,T}) ->
    {paren_type,L,[{ann_type,L,T}]};
maybe_add_paren(T) ->
    T.

term(Expr) ->
    try normalise(Expr)
    catch _:_R -> ret_err(?line(Expr), "bad attribute")
    end.

%% build_function([Clause]) -> {function,Line,Name,Arity,[Clause]}

build_function(Cs) ->
    Name = element(3, hd(Cs)),
    Arity = length(element(4, hd(Cs))),
    {function,?line(hd(Cs)),Name,Arity,check_clauses(Cs, Name, Arity)}.

%% build_rule([Clause]) -> {rule,Line,Name,Arity,[Clause]'}

build_rule(Cs) ->
    Name = element(3, hd(Cs)),
    Arity = length(element(4, hd(Cs))),
    {rule,?line(hd(Cs)),Name,Arity,check_clauses(Cs, Name, Arity)}.

%% build_fun(Line, [Clause]) -> {'fun',Line,{clauses,[Clause]}}.

build_fun(Line, Cs) ->
    Name = element(3, hd(Cs)),
    Arity = length(element(4, hd(Cs))),
    CheckedCs = check_clauses(Cs, Name, Arity),
    case Name of
        'fun' ->
            {'fun',Line,{clauses,CheckedCs}};
        Name ->
            {named_fun,Line,Name,CheckedCs}
    end.

check_clauses(Cs, Name, Arity) ->
     mapl(fun ({clause,L,N,As,G,B}) when N =:= Name, length(As) =:= Arity ->
		 {clause,L,As,G,B};
	     ({clause,L,_N,_As,_G,_B}) ->
		 ret_err(L, "head mismatch") end, Cs).

build_try(L,Es,Scs,{Ccs,As}) ->
    {'try',L,Es,Scs,Ccs,As}.

-spec ret_err(_, _) -> no_return().
ret_err(L, S) ->
    {location,Location} = get_attribute(L, location),
    return_error(Location, S).

%% mapl(F,List)
%% an alternative map which always maps from left to right
%% and makes it possible to interrupt the mapping with throw on
%% the first occurence from left as expected.
%% can be removed when the jam machine (and all other machines)
%% uses the standardized (Erlang 5.0) evaluation order (from left to right)
mapl(F, [H|T]) ->
	V = F(H),
	[V | mapl(F,T)];
mapl(_, []) ->
	[].

%%  Convert between the abstract form of a term and a term.

-spec normalise(AbsTerm) -> Data when
      AbsTerm :: abstract_expr(),
      Data :: term().
normalise({char,_,C}) -> C;
normalise({integer,_,I}) -> I;
normalise({float,_,F}) -> F;
normalise({atom,_,A}) -> A;
normalise({string,_,S}) -> S;
normalise({nil,_}) -> [];
normalise({bin,_,Fs}) ->
    {value, B, _} =
	eval_bits:expr_grp(Fs, [],
			   fun(E, _) ->
				   {value, normalise(E), []}
			   end, [], true),
    B;
normalise({cons,_,Head,Tail}) ->
    [normalise(Head)|normalise(Tail)];
normalise({tuple,_,Args}) ->
    list_to_tuple(normalise_list(Args));
normalise({map,_,Pairs}=M) ->
    map:from_list(lists:map(fun
		%% only allow '=>'
		({map_field_assoc,_,K,V}) -> {normalise(K),normalise(V)};
		(_) -> erlang:error({badarg,M})
	    end, Pairs));
%% Special case for unary +/-.
normalise({op,_,'+',{char,_,I}}) -> I;
normalise({op,_,'+',{integer,_,I}}) -> I;
normalise({op,_,'+',{float,_,F}}) -> F;
normalise({op,_,'-',{char,_,I}}) -> -I;		%Weird, but compatible!
normalise({op,_,'-',{integer,_,I}}) -> -I;
normalise({op,_,'-',{float,_,F}}) -> -F;
normalise(X) -> erlang:error({badarg, X}).

normalise_list([H|T]) ->
    [normalise(H)|normalise_list(T)];
normalise_list([]) ->
    [].

-spec abstract(Data) -> AbsTerm when
      Data :: term(),
      AbsTerm :: abstract_expr().
abstract(T) ->
    abstract(T, 0, epp:default_encoding()).

%%% abstract/2 takes line and encoding options
-spec abstract(Data, Options) -> AbsTerm when
      Data :: term(),
      Options :: Line | [Option],
      Option :: {line, Line} | {encoding, Encoding},
      Encoding :: latin1 | unicode | utf8,
      Line :: erl_scan:line(),
      AbsTerm :: abstract_expr().

abstract(T, Line) when is_integer(Line) ->
    abstract(T, Line, epp:default_encoding());
abstract(T, Options) when is_list(Options) ->
    Line = proplists:get_value(line, Options, 0),
    Encoding = proplists:get_value(encoding, Options,epp:default_encoding()),
    abstract(T, Line, Encoding).

-define(UNICODE(C),
        is_integer(C) andalso
         (C >= 0 andalso C < 16#D800 orelse
          C > 16#DFFF andalso C < 16#FFFE orelse
          C > 16#FFFF andalso C =< 16#10FFFF)).

abstract(T, L, _E) when is_integer(T) -> {integer,L,T};
abstract(T, L, _E) when is_float(T) -> {float,L,T};
abstract(T, L, _E) when is_atom(T) -> {atom,L,T};
abstract([], L, _E) -> {nil,L};
abstract(B, L, _E) when is_bitstring(B) ->
    {bin, L, [abstract_byte(Byte, L) || Byte <- bitstring_to_list(B)]};
abstract([C|T], L, unicode=E) when ?UNICODE(C) ->
    abstract_unicode_string(T, [C], L, E);
abstract([C|T], L, utf8=E) when ?UNICODE(C) ->
    abstract_unicode_string(T, [C], L, E);
abstract([C|T], L, latin1=E) when is_integer(C), 0 =< C, C < 256 ->
    abstract_string(T, [C], L, E);
abstract([H|T], L, E) ->
    {cons,L,abstract(H, L, E),abstract(T, L, E)};
abstract(Tuple, L, E) when is_tuple(Tuple) ->
    {tuple,L,abstract_list(tuple_to_list(Tuple), L, E)}.

abstract_string([C|T], String, L, E) when is_integer(C), 0 =< C, C < 256 ->
    abstract_string(T, [C|String], L, E);
abstract_string([], String, L, _E) ->
    {string, L, lists:reverse(String)};
abstract_string(T, String, L, E) ->
    not_string(String, abstract(T, L, E), L, E).

abstract_unicode_string([C|T], String, L, E) when ?UNICODE(C) ->
    abstract_unicode_string(T, [C|String], L, E);
abstract_unicode_string([], String, L, _E) ->
    {string, L, lists:reverse(String)};
abstract_unicode_string(T, String, L, E) ->
    not_string(String, abstract(T, L, E), L, E).

not_string([C|T], Result, L, E) ->
    not_string(T, {cons, L, {integer, L, C}, Result}, L, E);
not_string([], Result, _L, _E) ->
    Result.

abstract_list([H|T], L, E) ->
    [abstract(H, L, E)|abstract_list(T, L, E)];
abstract_list([], _L, _E) ->
    [].

abstract_byte(Byte, L) when is_integer(Byte) ->
    {bin_element, L, {integer, L, Byte}, default, default};
abstract_byte(Bits, L) ->
    Sz = bit_size(Bits),
    <<Val:Sz>> = Bits,
    {bin_element, L, {integer, L, Val}, {integer, L, Sz}, default}.

%%  Generate a list of tokens representing the abstract term.

-spec tokens(AbsTerm) -> Tokens when
      AbsTerm :: abstract_expr(),
      Tokens :: [token()].
tokens(Abs) ->
    tokens(Abs, []).

-spec tokens(AbsTerm, MoreTokens) -> Tokens when
      AbsTerm :: abstract_expr(),
      MoreTokens :: [token()],
      Tokens :: [token()].
tokens({char,L,C}, More) -> [{char,L,C}|More];
tokens({integer,L,N}, More) -> [{integer,L,N}|More];
tokens({float,L,F}, More) -> [{float,L,F}|More];
tokens({atom,L,A}, More) -> [{atom,L,A}|More];
tokens({var,L,V}, More) -> [{var,L,V}|More];
tokens({string,L,S}, More) -> [{string,L,S}|More];
tokens({nil,L}, More) -> [{'[',L},{']',L}|More];
tokens({cons,L,Head,Tail}, More) ->
    [{'[',L}|tokens(Head, tokens_tail(Tail, More))];
tokens({tuple,L,[]}, More) ->
    [{'{',L},{'}',L}|More];
tokens({tuple,L,[E|Es]}, More) ->
    [{'{',L}|tokens(E, tokens_tuple(Es, ?line(E), More))].

tokens_tail({cons,L,Head,Tail}, More) ->
    [{',',L}|tokens(Head, tokens_tail(Tail, More))];
tokens_tail({nil,L}, More) ->
    [{']',L}|More];
tokens_tail(Other, More) ->
    L = ?line(Other),
    [{'|',L}|tokens(Other, [{']',L}|More])].

tokens_tuple([E|Es], Line, More) ->
    [{',',Line}|tokens(E, tokens_tuple(Es, ?line(E), More))];
tokens_tuple([], Line, More) ->
    [{'}',Line}|More].

%% Give the relative precedences of operators.

inop_prec('=') -> {150,100,100};
inop_prec('!') -> {150,100,100};
inop_prec('orelse') -> {160,150,150};
inop_prec('andalso') -> {200,160,160};
inop_prec('==') -> {300,200,300};
inop_prec('/=') -> {300,200,300};
inop_prec('=<') -> {300,200,300};
inop_prec('<') -> {300,200,300};
inop_prec('>=') -> {300,200,300};
inop_prec('>') -> {300,200,300};
inop_prec('=:=') -> {300,200,300};
inop_prec('=/=') -> {300,200,300};
inop_prec('++') -> {400,300,300};
inop_prec('--') -> {400,300,300};
inop_prec('+') -> {400,400,500};
inop_prec('-') -> {400,400,500};
inop_prec('bor') -> {400,400,500};
inop_prec('bxor') -> {400,400,500};
inop_prec('bsl') -> {400,400,500};
inop_prec('bsr') -> {400,400,500};
inop_prec('or') -> {400,400,500};
inop_prec('xor') -> {400,400,500};
inop_prec('*') -> {500,500,600};
inop_prec('/') -> {500,500,600};
inop_prec('div') -> {500,500,600};
inop_prec('rem') -> {500,500,600};
inop_prec('band') -> {500,500,600};
inop_prec('and') -> {500,500,600};
inop_prec('#') -> {800,700,800};
inop_prec(':') -> {900,800,900};
inop_prec('.') -> {900,900,1000}.

-type pre_op() :: 'catch' | '+' | '-' | 'bnot' | 'not' | '#'.

-spec preop_prec(pre_op()) -> {0 | 600 | 700, 100 | 700 | 800}.

preop_prec('catch') -> {0,100};
preop_prec('+') -> {600,700};
preop_prec('-') -> {600,700};
preop_prec('bnot') -> {600,700};
preop_prec('not') -> {600,700};
preop_prec('#') -> {700,800}.

-spec func_prec() -> {800,700}.

func_prec() -> {800,700}.

-spec max_prec() -> 900.

max_prec() -> 900.

%%% [Experimental]. The parser just copies the attributes of the
%%% scanner tokens to the abstract format. This design decision has
%%% been hidden to some extent: use set_line() and get_attribute() to
%%% access the second element of (almost all) of the abstract format
%%% tuples. A typical use is to negate line numbers to prevent the
%%% compiler from emitting warnings and errors. The second element can
%%% (of course) be set to any value, but then these functions no
%%% longer apply. To get all present attributes as a property list
%%% get_attributes() should be used.

set_line(L, F) ->
    erl_scan:set_attribute(line, L, F).

get_attribute(L, Name) ->
    erl_scan:attributes_info(L, Name).

get_attributes(L) ->
    erl_scan:attributes_info(L).

%% vim: ft=erlang