aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/python/Pygments/py3/pygments/lexers/modula2.py
blob: cad2f4fd40864a1777424d8348bda725dbc1963f (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
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
"""
    pygments.lexers.modula2
    ~~~~~~~~~~~~~~~~~~~~~~~

    Multi-Dialect Lexer for Modula-2.

    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re

from pygments.lexer import RegexLexer, include
from pygments.util import get_bool_opt, get_list_opt
from pygments.token import Text, Comment, Operator, Keyword, Name, \
    String, Number, Punctuation, Error

__all__ = ['Modula2Lexer']


# Multi-Dialect Modula-2 Lexer
class Modula2Lexer(RegexLexer):
    """
    For `Modula-2 <http://www.modula2.org/>`_ source code.

    The Modula-2 lexer supports several dialects.  By default, it operates in
    fallback mode, recognising the *combined* literals, punctuation symbols
    and operators of all supported dialects, and the *combined* reserved words
    and builtins of PIM Modula-2, ISO Modula-2 and Modula-2 R10, while not
    differentiating between library defined identifiers.

    To select a specific dialect, a dialect option may be passed
    or a dialect tag may be embedded into a source file.

    Dialect Options:

    `m2pim`
        Select PIM Modula-2 dialect.
    `m2iso`
        Select ISO Modula-2 dialect.
    `m2r10`
        Select Modula-2 R10 dialect.
    `objm2`
        Select Objective Modula-2 dialect.

    The PIM and ISO dialect options may be qualified with a language extension.

    Language Extensions:

    `+aglet`
        Select Aglet Modula-2 extensions, available with m2iso.
    `+gm2`
        Select GNU Modula-2 extensions, available with m2pim.
    `+p1`
        Select p1 Modula-2 extensions, available with m2iso.
    `+xds`
        Select XDS Modula-2 extensions, available with m2iso.


    Passing a Dialect Option via Unix Commandline Interface

    Dialect options may be passed to the lexer using the `dialect` key.
    Only one such option should be passed. If multiple dialect options are
    passed, the first valid option is used, any subsequent options are ignored.

    Examples:

    `$ pygmentize -O full,dialect=m2iso -f html -o /path/to/output /path/to/input`
        Use ISO dialect to render input to HTML output
    `$ pygmentize -O full,dialect=m2iso+p1 -f rtf -o /path/to/output /path/to/input`
        Use ISO dialect with p1 extensions to render input to RTF output


    Embedding a Dialect Option within a source file

    A dialect option may be embedded in a source file in form of a dialect
    tag, a specially formatted comment that specifies a dialect option.

    Dialect Tag EBNF::

       dialectTag :
           OpeningCommentDelim Prefix dialectOption ClosingCommentDelim ;

       dialectOption :
           'm2pim' | 'm2iso' | 'm2r10' | 'objm2' |
           'm2iso+aglet' | 'm2pim+gm2' | 'm2iso+p1' | 'm2iso+xds' ;

       Prefix : '!' ;

       OpeningCommentDelim : '(*' ;

       ClosingCommentDelim : '*)' ;

    No whitespace is permitted between the tokens of a dialect tag.

    In the event that a source file contains multiple dialect tags, the first
    tag that contains a valid dialect option will be used and any subsequent
    dialect tags will be ignored.  Ideally, a dialect tag should be placed
    at the beginning of a source file.

    An embedded dialect tag overrides a dialect option set via command line.

    Examples:

    ``(*!m2r10*) DEFINITION MODULE Foobar; ...``
        Use Modula2 R10 dialect to render this source file.
    ``(*!m2pim+gm2*) DEFINITION MODULE Bazbam; ...``
        Use PIM dialect with GNU extensions to render this source file.


    Algol Publication Mode:

    In Algol publication mode, source text is rendered for publication of
    algorithms in scientific papers and academic texts, following the format
    of the Revised Algol-60 Language Report.  It is activated by passing
    one of two corresponding styles as an option:

    `algol`
        render reserved words lowercase underline boldface
        and builtins lowercase boldface italic
    `algol_nu`
        render reserved words lowercase boldface (no underlining)
        and builtins lowercase boldface italic

    The lexer automatically performs the required lowercase conversion when
    this mode is activated.

    Example:

    ``$ pygmentize -O full,style=algol -f latex -o /path/to/output /path/to/input``
        Render input file in Algol publication mode to LaTeX output.


    Rendering Mode of First Class ADT Identifiers:

    The rendering of standard library first class ADT identifiers is controlled
    by option flag "treat_stdlib_adts_as_builtins".

    When this option is turned on, standard library ADT identifiers are rendered
    as builtins.  When it is turned off, they are rendered as ordinary library
    identifiers.

    `treat_stdlib_adts_as_builtins` (default: On)

    The option is useful for dialects that support ADTs as first class objects
    and provide ADTs in the standard library that would otherwise be built-in.

    At present, only Modula-2 R10 supports library ADTs as first class objects
    and therefore, no ADT identifiers are defined for any other dialects.

    Example:

    ``$ pygmentize -O full,dialect=m2r10,treat_stdlib_adts_as_builtins=Off ...``
        Render standard library ADTs as ordinary library types.

    .. versionadded:: 1.3

    .. versionchanged:: 2.1
       Added multi-dialect support.
    """
    name = 'Modula-2'
    aliases = ['modula2', 'm2']
    filenames = ['*.def', '*.mod']
    mimetypes = ['text/x-modula2']

    flags = re.MULTILINE | re.DOTALL

    tokens = {
        'whitespace': [
            (r'\n+', Text),  # blank lines
            (r'\s+', Text),  # whitespace
        ],
        'dialecttags': [
            # PIM Dialect Tag
            (r'\(\*!m2pim\*\)', Comment.Special),
            # ISO Dialect Tag
            (r'\(\*!m2iso\*\)', Comment.Special),
            # M2R10 Dialect Tag
            (r'\(\*!m2r10\*\)', Comment.Special),
            # ObjM2 Dialect Tag
            (r'\(\*!objm2\*\)', Comment.Special),
            # Aglet Extensions Dialect Tag
            (r'\(\*!m2iso\+aglet\*\)', Comment.Special),
            # GNU Extensions Dialect Tag
            (r'\(\*!m2pim\+gm2\*\)', Comment.Special),
            # p1 Extensions Dialect Tag
            (r'\(\*!m2iso\+p1\*\)', Comment.Special),
            # XDS Extensions Dialect Tag
            (r'\(\*!m2iso\+xds\*\)', Comment.Special),
        ],
        'identifiers': [
            (r'([a-zA-Z_$][\w$]*)', Name),
        ],
        'prefixed_number_literals': [
            #
            # Base-2, whole number
            (r'0b[01]+(\'[01]+)*', Number.Bin),
            #
            # Base-16, whole number
            (r'0[ux][0-9A-F]+(\'[0-9A-F]+)*', Number.Hex),
        ],
        'plain_number_literals': [
            #
            # Base-10, real number with exponent
            (r'[0-9]+(\'[0-9]+)*'  # integral part
             r'\.[0-9]+(\'[0-9]+)*'  # fractional part
             r'[eE][+-]?[0-9]+(\'[0-9]+)*',  # exponent
             Number.Float),
            #
            # Base-10, real number without exponent
            (r'[0-9]+(\'[0-9]+)*'  # integral part
             r'\.[0-9]+(\'[0-9]+)*',  # fractional part
             Number.Float),
            #
            # Base-10, whole number
            (r'[0-9]+(\'[0-9]+)*', Number.Integer),
        ],
        'suffixed_number_literals': [
            #
            # Base-8, whole number
            (r'[0-7]+B', Number.Oct),
            #
            # Base-8, character code
            (r'[0-7]+C', Number.Oct),
            #
            # Base-16, number
            (r'[0-9A-F]+H', Number.Hex),
        ],
        'string_literals': [
            (r'"(\\\\|\\[^\\]|[^"\\])*"', String.Double),
            (r"'(\\\\|\\[^\\]|[^'\\])*'", String.Single),
        ],
        'digraph_operators': [
            # Dot Product Operator
            (r'\*\.', Operator),
            # Array Concatenation Operator
            (r'\+>', Operator),  # M2R10 + ObjM2
            # Inequality Operator
            (r'<>', Operator),  # ISO + PIM
            # Less-Or-Equal, Subset
            (r'<=', Operator),
            # Greater-Or-Equal, Superset
            (r'>=', Operator),
            # Identity Operator
            (r'==', Operator),  # M2R10 + ObjM2
            # Type Conversion Operator
            (r'::', Operator),  # M2R10 + ObjM2
            # Assignment Symbol
            (r':=', Operator),
            # Postfix Increment Mutator
            (r'\+\+', Operator),  # M2R10 + ObjM2
            # Postfix Decrement Mutator
            (r'--', Operator),  # M2R10 + ObjM2
        ],
        'unigraph_operators': [
            # Arithmetic Operators
            (r'[+-]', Operator),
            (r'[*/]', Operator),
            # ISO 80000-2 compliant Set Difference Operator
            (r'\\', Operator),  # M2R10 + ObjM2
            # Relational Operators
            (r'[=#<>]', Operator),
            # Dereferencing Operator
            (r'\^', Operator),
            # Dereferencing Operator Synonym
            (r'@', Operator),  # ISO
            # Logical AND Operator Synonym
            (r'&', Operator),  # PIM + ISO
            # Logical NOT Operator Synonym
            (r'~', Operator),  # PIM + ISO
            # Smalltalk Message Prefix
            (r'`', Operator),  # ObjM2
        ],
        'digraph_punctuation': [
            # Range Constructor
            (r'\.\.', Punctuation),
            # Opening Chevron Bracket
            (r'<<', Punctuation),  # M2R10 + ISO
            # Closing Chevron Bracket
            (r'>>', Punctuation),  # M2R10 + ISO
            # Blueprint Punctuation
            (r'->', Punctuation),  # M2R10 + ISO
            # Distinguish |# and # in M2 R10
            (r'\|#', Punctuation),
            # Distinguish ## and # in M2 R10
            (r'##', Punctuation),
            # Distinguish |* and * in M2 R10
            (r'\|\*', Punctuation),
        ],
        'unigraph_punctuation': [
            # Common Punctuation
            (r'[()\[\]{},.:;|]', Punctuation),
            # Case Label Separator Synonym
            (r'!', Punctuation),  # ISO
            # Blueprint Punctuation
            (r'\?', Punctuation),  # M2R10 + ObjM2
        ],
        'comments': [
            # Single Line Comment
            (r'^//.*?\n', Comment.Single),  # M2R10 + ObjM2
            # Block Comment
            (r'\(\*([^$].*?)\*\)', Comment.Multiline),
            # Template Block Comment
            (r'/\*(.*?)\*/', Comment.Multiline),  # M2R10 + ObjM2
        ],
        'pragmas': [
            # ISO Style Pragmas
            (r'<\*.*?\*>', Comment.Preproc),  # ISO, M2R10 + ObjM2
            # Pascal Style Pragmas
            (r'\(\*\$.*?\*\)', Comment.Preproc),  # PIM
        ],
        'root': [
            include('whitespace'),
            include('dialecttags'),
            include('pragmas'),
            include('comments'),
            include('identifiers'),
            include('suffixed_number_literals'),  # PIM + ISO
            include('prefixed_number_literals'),  # M2R10 + ObjM2
            include('plain_number_literals'),
            include('string_literals'),
            include('digraph_punctuation'),
            include('digraph_operators'),
            include('unigraph_punctuation'),
            include('unigraph_operators'),
        ]
    }

#  C o m m o n   D a t a s e t s

    # Common Reserved Words Dataset
    common_reserved_words = (
        # 37 common reserved words
        'AND', 'ARRAY', 'BEGIN', 'BY', 'CASE', 'CONST', 'DEFINITION', 'DIV',
        'DO', 'ELSE', 'ELSIF', 'END', 'EXIT', 'FOR', 'FROM', 'IF',
        'IMPLEMENTATION', 'IMPORT', 'IN', 'LOOP', 'MOD', 'MODULE', 'NOT',
        'OF', 'OR', 'POINTER', 'PROCEDURE', 'RECORD', 'REPEAT', 'RETURN',
        'SET', 'THEN', 'TO', 'TYPE', 'UNTIL', 'VAR', 'WHILE',
    )

    # Common Builtins Dataset
    common_builtins = (
        # 16 common builtins
        'ABS', 'BOOLEAN', 'CARDINAL', 'CHAR', 'CHR', 'FALSE', 'INTEGER',
        'LONGINT', 'LONGREAL', 'MAX', 'MIN', 'NIL', 'ODD', 'ORD', 'REAL',
        'TRUE',
    )

    # Common Pseudo-Module Builtins Dataset
    common_pseudo_builtins = (
        # 4 common pseudo builtins
        'ADDRESS', 'BYTE', 'WORD', 'ADR'
    )

#  P I M   M o d u l a - 2   D a t a s e t s

    # Lexemes to Mark as Error Tokens for PIM Modula-2
    pim_lexemes_to_reject = (
        '!', '`', '@', '$', '%', '?', '\\', '==', '++', '--', '::', '*.',
        '+>', '->', '<<', '>>', '|#', '##',
    )

    # PIM Modula-2 Additional Reserved Words Dataset
    pim_additional_reserved_words = (
        # 3 additional reserved words
        'EXPORT', 'QUALIFIED', 'WITH',
    )

    # PIM Modula-2 Additional Builtins Dataset
    pim_additional_builtins = (
        # 16 additional builtins
        'BITSET', 'CAP', 'DEC', 'DISPOSE', 'EXCL', 'FLOAT', 'HALT', 'HIGH',
        'INC', 'INCL', 'NEW', 'NIL', 'PROC', 'SIZE', 'TRUNC', 'VAL',
    )

    # PIM Modula-2 Additional Pseudo-Module Builtins Dataset
    pim_additional_pseudo_builtins = (
        # 5 additional pseudo builtins
        'SYSTEM', 'PROCESS', 'TSIZE', 'NEWPROCESS', 'TRANSFER',
    )

#  I S O   M o d u l a - 2   D a t a s e t s

    # Lexemes to Mark as Error Tokens for ISO Modula-2
    iso_lexemes_to_reject = (
        '`', '$', '%', '?', '\\', '==', '++', '--', '::', '*.', '+>', '->',
        '<<', '>>', '|#', '##',
    )

    # ISO Modula-2 Additional Reserved Words Dataset
    iso_additional_reserved_words = (
        # 9 additional reserved words (ISO 10514-1)
        'EXCEPT', 'EXPORT', 'FINALLY', 'FORWARD', 'PACKEDSET', 'QUALIFIED',
        'REM', 'RETRY', 'WITH',
        # 10 additional reserved words (ISO 10514-2 & ISO 10514-3)
        'ABSTRACT', 'AS', 'CLASS', 'GUARD', 'INHERIT', 'OVERRIDE', 'READONLY',
        'REVEAL', 'TRACED', 'UNSAFEGUARDED',
    )

    # ISO Modula-2 Additional Builtins Dataset
    iso_additional_builtins = (
        # 26 additional builtins (ISO 10514-1)
        'BITSET', 'CAP', 'CMPLX', 'COMPLEX', 'DEC', 'DISPOSE', 'EXCL', 'FLOAT',
        'HALT', 'HIGH', 'IM', 'INC', 'INCL', 'INT', 'INTERRUPTIBLE',  'LENGTH',
        'LFLOAT', 'LONGCOMPLEX', 'NEW', 'PROC', 'PROTECTION', 'RE', 'SIZE',
        'TRUNC', 'UNINTERRUBTIBLE', 'VAL',
        # 5 additional builtins (ISO 10514-2 & ISO 10514-3)
        'CREATE', 'DESTROY', 'EMPTY', 'ISMEMBER', 'SELF',
    )

    # ISO Modula-2 Additional Pseudo-Module Builtins Dataset
    iso_additional_pseudo_builtins = (
        # 14 additional builtins (SYSTEM)
        'SYSTEM', 'BITSPERLOC', 'LOCSPERBYTE', 'LOCSPERWORD', 'LOC',
        'ADDADR', 'SUBADR', 'DIFADR', 'MAKEADR', 'ADR',
        'ROTATE', 'SHIFT', 'CAST', 'TSIZE',
        # 13 additional builtins (COROUTINES)
        'COROUTINES', 'ATTACH', 'COROUTINE', 'CURRENT', 'DETACH', 'HANDLER',
        'INTERRUPTSOURCE', 'IOTRANSFER', 'IsATTACHED', 'LISTEN',
        'NEWCOROUTINE', 'PROT', 'TRANSFER',
        # 9 additional builtins (EXCEPTIONS)
        'EXCEPTIONS', 'AllocateSource', 'CurrentNumber', 'ExceptionNumber',
        'ExceptionSource', 'GetMessage', 'IsCurrentSource',
        'IsExceptionalExecution', 'RAISE',
        # 3 additional builtins (TERMINATION)
        'TERMINATION', 'IsTerminating', 'HasHalted',
        # 4 additional builtins (M2EXCEPTION)
        'M2EXCEPTION', 'M2Exceptions', 'M2Exception', 'IsM2Exception',
        'indexException', 'rangeException', 'caseSelectException',
        'invalidLocation', 'functionException', 'wholeValueException',
        'wholeDivException', 'realValueException', 'realDivException',
        'complexValueException', 'complexDivException', 'protException',
        'sysException', 'coException', 'exException',
    )

#  M o d u l a - 2   R 1 0   D a t a s e t s

    # Lexemes to Mark as Error Tokens for Modula-2 R10
    m2r10_lexemes_to_reject = (
        '!', '`', '@', '$', '%', '&', '<>',
    )

    # Modula-2 R10 reserved words in addition to the common set
    m2r10_additional_reserved_words = (
        # 12 additional reserved words
        'ALIAS', 'ARGLIST', 'BLUEPRINT', 'COPY', 'GENLIB', 'INDETERMINATE',
        'NEW', 'NONE', 'OPAQUE', 'REFERENTIAL', 'RELEASE', 'RETAIN',
        # 2 additional reserved words with symbolic assembly option
        'ASM', 'REG',
    )

    # Modula-2 R10 builtins in addition to the common set
    m2r10_additional_builtins = (
        # 26 additional builtins
        'CARDINAL', 'COUNT', 'EMPTY', 'EXISTS', 'INSERT', 'LENGTH', 'LONGCARD',
        'OCTET', 'PTR', 'PRED', 'READ', 'READNEW', 'REMOVE', 'RETRIEVE', 'SORT',
        'STORE', 'SUBSET', 'SUCC', 'TLIMIT', 'TMAX', 'TMIN', 'TRUE', 'TSIZE',
        'UNICHAR', 'WRITE', 'WRITEF',
    )

    # Modula-2 R10 Additional Pseudo-Module Builtins Dataset
    m2r10_additional_pseudo_builtins = (
        # 13 additional builtins (TPROPERTIES)
        'TPROPERTIES', 'PROPERTY', 'LITERAL', 'TPROPERTY', 'TLITERAL',
        'TBUILTIN', 'TDYN', 'TREFC', 'TNIL', 'TBASE', 'TPRECISION',
        'TMAXEXP', 'TMINEXP',
        # 4 additional builtins (CONVERSION)
        'CONVERSION', 'TSXFSIZE', 'SXF', 'VAL',
        # 35 additional builtins (UNSAFE)
        'UNSAFE', 'CAST', 'INTRINSIC', 'AVAIL', 'ADD', 'SUB', 'ADDC', 'SUBC',
        'FETCHADD', 'FETCHSUB', 'SHL', 'SHR', 'ASHR', 'ROTL', 'ROTR', 'ROTLC',
        'ROTRC', 'BWNOT', 'BWAND', 'BWOR', 'BWXOR', 'BWNAND', 'BWNOR',
        'SETBIT', 'TESTBIT', 'LSBIT', 'MSBIT', 'CSBITS', 'BAIL', 'HALT',
        'TODO', 'FFI', 'ADDR', 'VARGLIST', 'VARGC',
        # 11 additional builtins (ATOMIC)
        'ATOMIC', 'INTRINSIC', 'AVAIL', 'SWAP', 'CAS', 'INC', 'DEC', 'BWAND',
        'BWNAND', 'BWOR', 'BWXOR',
        # 7 additional builtins (COMPILER)
        'COMPILER', 'DEBUG', 'MODNAME', 'PROCNAME', 'LINENUM', 'DEFAULT',
        'HASH',
        # 5 additional builtins (ASSEMBLER)
        'ASSEMBLER', 'REGISTER', 'SETREG', 'GETREG', 'CODE',
    )

#  O b j e c t i v e   M o d u l a - 2   D a t a s e t s

    # Lexemes to Mark as Error Tokens for Objective Modula-2
    objm2_lexemes_to_reject = (
        '!', '$', '%', '&', '<>',
    )

    # Objective Modula-2 Extensions
    # reserved words in addition to Modula-2 R10
    objm2_additional_reserved_words = (
        # 16 additional reserved words
        'BYCOPY', 'BYREF', 'CLASS', 'CONTINUE', 'CRITICAL', 'INOUT', 'METHOD',
        'ON', 'OPTIONAL', 'OUT', 'PRIVATE', 'PROTECTED', 'PROTOCOL', 'PUBLIC',
        'SUPER', 'TRY',
    )

    # Objective Modula-2 Extensions
    # builtins in addition to Modula-2 R10
    objm2_additional_builtins = (
        # 3 additional builtins
        'OBJECT', 'NO', 'YES',
    )

    # Objective Modula-2 Extensions
    # pseudo-module builtins in addition to Modula-2 R10
    objm2_additional_pseudo_builtins = (
        # None
    )

#  A g l e t   M o d u l a - 2   D a t a s e t s

    # Aglet Extensions
    # reserved words in addition to ISO Modula-2
    aglet_additional_reserved_words = (
        # None
    )

    # Aglet Extensions
    # builtins in addition to ISO Modula-2
    aglet_additional_builtins = (
        # 9 additional builtins
        'BITSET8', 'BITSET16', 'BITSET32', 'CARDINAL8', 'CARDINAL16',
        'CARDINAL32', 'INTEGER8', 'INTEGER16', 'INTEGER32',
    )

    # Aglet Modula-2 Extensions
    # pseudo-module builtins in addition to ISO Modula-2
    aglet_additional_pseudo_builtins = (
        # None
    )

#  G N U   M o d u l a - 2   D a t a s e t s

    # GNU Extensions
    # reserved words in addition to PIM Modula-2
    gm2_additional_reserved_words = (
        # 10 additional reserved words
        'ASM', '__ATTRIBUTE__', '__BUILTIN__', '__COLUMN__', '__DATE__',
        '__FILE__', '__FUNCTION__', '__LINE__', '__MODULE__', 'VOLATILE',
    )

    # GNU Extensions
    # builtins in addition to PIM Modula-2
    gm2_additional_builtins = (
        # 21 additional builtins
        'BITSET8', 'BITSET16', 'BITSET32', 'CARDINAL8', 'CARDINAL16',
        'CARDINAL32', 'CARDINAL64', 'COMPLEX32', 'COMPLEX64', 'COMPLEX96',
        'COMPLEX128', 'INTEGER8', 'INTEGER16', 'INTEGER32', 'INTEGER64',
        'REAL8', 'REAL16', 'REAL32', 'REAL96', 'REAL128', 'THROW',
    )

    # GNU Extensions
    # pseudo-module builtins in addition to PIM Modula-2
    gm2_additional_pseudo_builtins = (
        # None
    )

#  p 1   M o d u l a - 2   D a t a s e t s

    # p1 Extensions
    # reserved words in addition to ISO Modula-2
    p1_additional_reserved_words = (
        # None
    )

    # p1 Extensions
    # builtins in addition to ISO Modula-2
    p1_additional_builtins = (
        # None
    )

    # p1 Modula-2 Extensions
    # pseudo-module builtins in addition to ISO Modula-2
    p1_additional_pseudo_builtins = (
        # 1 additional builtin
        'BCD',
    )

#  X D S   M o d u l a - 2   D a t a s e t s

    # XDS Extensions
    # reserved words in addition to ISO Modula-2
    xds_additional_reserved_words = (
        # 1 additional reserved word
        'SEQ',
    )

    # XDS Extensions
    # builtins in addition to ISO Modula-2
    xds_additional_builtins = (
        # 9 additional builtins
        'ASH', 'ASSERT', 'DIFFADR_TYPE', 'ENTIER', 'INDEX', 'LEN',
        'LONGCARD', 'SHORTCARD', 'SHORTINT',
    )

    # XDS Modula-2 Extensions
    # pseudo-module builtins in addition to ISO Modula-2
    xds_additional_pseudo_builtins = (
        # 22 additional builtins (SYSTEM)
        'PROCESS', 'NEWPROCESS', 'BOOL8', 'BOOL16', 'BOOL32', 'CARD8',
        'CARD16', 'CARD32', 'INT8', 'INT16', 'INT32', 'REF', 'MOVE',
        'FILL', 'GET', 'PUT', 'CC', 'int', 'unsigned', 'size_t', 'void'
        # 3 additional builtins (COMPILER)
        'COMPILER', 'OPTION', 'EQUATION'
    )

#  P I M   S t a n d a r d   L i b r a r y   D a t a s e t s

    # PIM Modula-2 Standard Library Modules Dataset
    pim_stdlib_module_identifiers = (
        'Terminal', 'FileSystem', 'InOut', 'RealInOut', 'MathLib0', 'Storage',
    )

    # PIM Modula-2 Standard Library Types Dataset
    pim_stdlib_type_identifiers = (
        'Flag', 'FlagSet', 'Response', 'Command', 'Lock', 'Permission',
        'MediumType', 'File', 'FileProc', 'DirectoryProc', 'FileCommand',
        'DirectoryCommand',
    )

    # PIM Modula-2 Standard Library Procedures Dataset
    pim_stdlib_proc_identifiers = (
        'Read', 'BusyRead', 'ReadAgain', 'Write', 'WriteString', 'WriteLn',
        'Create', 'Lookup', 'Close', 'Delete', 'Rename', 'SetRead', 'SetWrite',
        'SetModify', 'SetOpen', 'Doio', 'SetPos', 'GetPos', 'Length', 'Reset',
        'Again', 'ReadWord', 'WriteWord', 'ReadChar', 'WriteChar',
        'CreateMedium', 'DeleteMedium', 'AssignName', 'DeassignName',
        'ReadMedium', 'LookupMedium', 'OpenInput', 'OpenOutput', 'CloseInput',
        'CloseOutput', 'ReadString', 'ReadInt', 'ReadCard', 'ReadWrd',
        'WriteInt', 'WriteCard', 'WriteOct', 'WriteHex', 'WriteWrd',
        'ReadReal', 'WriteReal', 'WriteFixPt', 'WriteRealOct', 'sqrt', 'exp',
        'ln', 'sin', 'cos', 'arctan', 'entier', 'ALLOCATE', 'DEALLOCATE',
    )

    # PIM Modula-2 Standard Library Variables Dataset
    pim_stdlib_var_identifiers = (
        'Done', 'termCH', 'in', 'out'
    )

    # PIM Modula-2 Standard Library Constants Dataset
    pim_stdlib_const_identifiers = (
        'EOL',
    )

#  I S O   S t a n d a r d   L i b r a r y   D a t a s e t s

    # ISO Modula-2 Standard Library Modules Dataset
    iso_stdlib_module_identifiers = (
        # TO DO
    )

    # ISO Modula-2 Standard Library Types Dataset
    iso_stdlib_type_identifiers = (
        # TO DO
    )

    # ISO Modula-2 Standard Library Procedures Dataset
    iso_stdlib_proc_identifiers = (
        # TO DO
    )

    # ISO Modula-2 Standard Library Variables Dataset
    iso_stdlib_var_identifiers = (
        # TO DO
    )

    # ISO Modula-2 Standard Library Constants Dataset
    iso_stdlib_const_identifiers = (
        # TO DO
    )

#  M 2   R 1 0   S t a n d a r d   L i b r a r y   D a t a s e t s

    # Modula-2 R10 Standard Library ADTs Dataset
    m2r10_stdlib_adt_identifiers = (
        'BCD', 'LONGBCD', 'BITSET', 'SHORTBITSET', 'LONGBITSET',
        'LONGLONGBITSET', 'COMPLEX', 'LONGCOMPLEX', 'SHORTCARD', 'LONGLONGCARD',
        'SHORTINT', 'LONGLONGINT', 'POSINT', 'SHORTPOSINT', 'LONGPOSINT',
        'LONGLONGPOSINT', 'BITSET8', 'BITSET16', 'BITSET32', 'BITSET64',
        'BITSET128', 'BS8', 'BS16', 'BS32', 'BS64', 'BS128', 'CARDINAL8',
        'CARDINAL16', 'CARDINAL32', 'CARDINAL64', 'CARDINAL128', 'CARD8',
        'CARD16', 'CARD32', 'CARD64', 'CARD128', 'INTEGER8', 'INTEGER16',
        'INTEGER32', 'INTEGER64', 'INTEGER128', 'INT8', 'INT16', 'INT32',
        'INT64', 'INT128', 'STRING', 'UNISTRING',
    )

    # Modula-2 R10 Standard Library Blueprints Dataset
    m2r10_stdlib_blueprint_identifiers = (
        'ProtoRoot', 'ProtoComputational', 'ProtoNumeric', 'ProtoScalar',
        'ProtoNonScalar', 'ProtoCardinal', 'ProtoInteger', 'ProtoReal',
        'ProtoComplex', 'ProtoVector', 'ProtoTuple', 'ProtoCompArray',
        'ProtoCollection', 'ProtoStaticArray', 'ProtoStaticSet',
        'ProtoStaticString', 'ProtoArray', 'ProtoString', 'ProtoSet',
        'ProtoMultiSet', 'ProtoDictionary', 'ProtoMultiDict', 'ProtoExtension',
        'ProtoIO', 'ProtoCardMath', 'ProtoIntMath', 'ProtoRealMath',
    )

    # Modula-2 R10 Standard Library Modules Dataset
    m2r10_stdlib_module_identifiers = (
        'ASCII', 'BooleanIO', 'CharIO', 'UnicharIO', 'OctetIO',
        'CardinalIO', 'LongCardIO', 'IntegerIO', 'LongIntIO', 'RealIO',
        'LongRealIO', 'BCDIO', 'LongBCDIO', 'CardMath', 'LongCardMath',
        'IntMath', 'LongIntMath', 'RealMath', 'LongRealMath', 'BCDMath',
        'LongBCDMath', 'FileIO', 'FileSystem', 'Storage', 'IOSupport',
    )

    # Modula-2 R10 Standard Library Types Dataset
    m2r10_stdlib_type_identifiers = (
        'File', 'Status',
        # TO BE COMPLETED
    )

    # Modula-2 R10 Standard Library Procedures Dataset
    m2r10_stdlib_proc_identifiers = (
        'ALLOCATE', 'DEALLOCATE', 'SIZE',
        # TO BE COMPLETED
    )

    # Modula-2 R10 Standard Library Variables Dataset
    m2r10_stdlib_var_identifiers = (
        'stdIn', 'stdOut', 'stdErr',
    )

    # Modula-2 R10 Standard Library Constants Dataset
    m2r10_stdlib_const_identifiers = (
        'pi', 'tau',
    )

#  D i a l e c t s

    # Dialect modes
    dialects = (
        'unknown',
        'm2pim', 'm2iso', 'm2r10', 'objm2',
        'm2iso+aglet', 'm2pim+gm2', 'm2iso+p1', 'm2iso+xds',
    )

#   D a t a b a s e s

    # Lexemes to Mark as Errors Database
    lexemes_to_reject_db = {
        # Lexemes to reject for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Lexemes to reject for PIM Modula-2
        'm2pim': (
            pim_lexemes_to_reject,
        ),
        # Lexemes to reject for ISO Modula-2
        'm2iso': (
            iso_lexemes_to_reject,
        ),
        # Lexemes to reject for Modula-2 R10
        'm2r10': (
            m2r10_lexemes_to_reject,
        ),
        # Lexemes to reject for Objective Modula-2
        'objm2': (
            objm2_lexemes_to_reject,
        ),
        # Lexemes to reject for Aglet Modula-2
        'm2iso+aglet': (
            iso_lexemes_to_reject,
        ),
        # Lexemes to reject for GNU Modula-2
        'm2pim+gm2': (
            pim_lexemes_to_reject,
        ),
        # Lexemes to reject for p1 Modula-2
        'm2iso+p1': (
            iso_lexemes_to_reject,
        ),
        # Lexemes to reject for XDS Modula-2
        'm2iso+xds': (
            iso_lexemes_to_reject,
        ),
    }

    # Reserved Words Database
    reserved_words_db = {
        # Reserved words for unknown dialect
        'unknown': (
            common_reserved_words,
            pim_additional_reserved_words,
            iso_additional_reserved_words,
            m2r10_additional_reserved_words,
        ),

        # Reserved words for PIM Modula-2
        'm2pim': (
            common_reserved_words,
            pim_additional_reserved_words,
        ),

        # Reserved words for Modula-2 R10
        'm2iso': (
            common_reserved_words,
            iso_additional_reserved_words,
        ),

        # Reserved words for ISO Modula-2
        'm2r10': (
            common_reserved_words,
            m2r10_additional_reserved_words,
        ),

        # Reserved words for Objective Modula-2
        'objm2': (
            common_reserved_words,
            m2r10_additional_reserved_words,
            objm2_additional_reserved_words,
        ),

        # Reserved words for Aglet Modula-2 Extensions
        'm2iso+aglet': (
            common_reserved_words,
            iso_additional_reserved_words,
            aglet_additional_reserved_words,
        ),

        # Reserved words for GNU Modula-2 Extensions
        'm2pim+gm2': (
            common_reserved_words,
            pim_additional_reserved_words,
            gm2_additional_reserved_words,
        ),

        # Reserved words for p1 Modula-2 Extensions
        'm2iso+p1': (
            common_reserved_words,
            iso_additional_reserved_words,
            p1_additional_reserved_words,
        ),

        # Reserved words for XDS Modula-2 Extensions
        'm2iso+xds': (
            common_reserved_words,
            iso_additional_reserved_words,
            xds_additional_reserved_words,
        ),
    }

    # Builtins Database
    builtins_db = {
        # Builtins for unknown dialect
        'unknown': (
            common_builtins,
            pim_additional_builtins,
            iso_additional_builtins,
            m2r10_additional_builtins,
        ),

        # Builtins for PIM Modula-2
        'm2pim': (
            common_builtins,
            pim_additional_builtins,
        ),

        # Builtins for ISO Modula-2
        'm2iso': (
            common_builtins,
            iso_additional_builtins,
        ),

        # Builtins for ISO Modula-2
        'm2r10': (
            common_builtins,
            m2r10_additional_builtins,
        ),

        # Builtins for Objective Modula-2
        'objm2': (
            common_builtins,
            m2r10_additional_builtins,
            objm2_additional_builtins,
        ),

        # Builtins for Aglet Modula-2 Extensions
        'm2iso+aglet': (
            common_builtins,
            iso_additional_builtins,
            aglet_additional_builtins,
        ),

        # Builtins for GNU Modula-2 Extensions
        'm2pim+gm2': (
            common_builtins,
            pim_additional_builtins,
            gm2_additional_builtins,
        ),

        # Builtins for p1 Modula-2 Extensions
        'm2iso+p1': (
            common_builtins,
            iso_additional_builtins,
            p1_additional_builtins,
        ),

        # Builtins for XDS Modula-2 Extensions
        'm2iso+xds': (
            common_builtins,
            iso_additional_builtins,
            xds_additional_builtins,
        ),
    }

    # Pseudo-Module Builtins Database
    pseudo_builtins_db = {
        # Builtins for unknown dialect
        'unknown': (
            common_pseudo_builtins,
            pim_additional_pseudo_builtins,
            iso_additional_pseudo_builtins,
            m2r10_additional_pseudo_builtins,
        ),

        # Builtins for PIM Modula-2
        'm2pim': (
            common_pseudo_builtins,
            pim_additional_pseudo_builtins,
        ),

        # Builtins for ISO Modula-2
        'm2iso': (
            common_pseudo_builtins,
            iso_additional_pseudo_builtins,
        ),

        # Builtins for ISO Modula-2
        'm2r10': (
            common_pseudo_builtins,
            m2r10_additional_pseudo_builtins,
        ),

        # Builtins for Objective Modula-2
        'objm2': (
            common_pseudo_builtins,
            m2r10_additional_pseudo_builtins,
            objm2_additional_pseudo_builtins,
        ),

        # Builtins for Aglet Modula-2 Extensions
        'm2iso+aglet': (
            common_pseudo_builtins,
            iso_additional_pseudo_builtins,
            aglet_additional_pseudo_builtins,
        ),

        # Builtins for GNU Modula-2 Extensions
        'm2pim+gm2': (
            common_pseudo_builtins,
            pim_additional_pseudo_builtins,
            gm2_additional_pseudo_builtins,
        ),

        # Builtins for p1 Modula-2 Extensions
        'm2iso+p1': (
            common_pseudo_builtins,
            iso_additional_pseudo_builtins,
            p1_additional_pseudo_builtins,
        ),

        # Builtins for XDS Modula-2 Extensions
        'm2iso+xds': (
            common_pseudo_builtins,
            iso_additional_pseudo_builtins,
            xds_additional_pseudo_builtins,
        ),
    }

    # Standard Library ADTs Database
    stdlib_adts_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library ADTs for PIM Modula-2
        'm2pim': (
            # No first class library types
        ),

        # Standard Library ADTs for ISO Modula-2
        'm2iso': (
            # No first class library types
        ),

        # Standard Library ADTs for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_adt_identifiers,
        ),

        # Standard Library ADTs for Objective Modula-2
        'objm2': (
            m2r10_stdlib_adt_identifiers,
        ),

        # Standard Library ADTs for Aglet Modula-2
        'm2iso+aglet': (
            # No first class library types
        ),

        # Standard Library ADTs for GNU Modula-2
        'm2pim+gm2': (
            # No first class library types
        ),

        # Standard Library ADTs for p1 Modula-2
        'm2iso+p1': (
            # No first class library types
        ),

        # Standard Library ADTs for XDS Modula-2
        'm2iso+xds': (
            # No first class library types
        ),
    }

    # Standard Library Modules Database
    stdlib_modules_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library Modules for PIM Modula-2
        'm2pim': (
            pim_stdlib_module_identifiers,
        ),

        # Standard Library Modules for ISO Modula-2
        'm2iso': (
            iso_stdlib_module_identifiers,
        ),

        # Standard Library Modules for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_blueprint_identifiers,
            m2r10_stdlib_module_identifiers,
            m2r10_stdlib_adt_identifiers,
        ),

        # Standard Library Modules for Objective Modula-2
        'objm2': (
            m2r10_stdlib_blueprint_identifiers,
            m2r10_stdlib_module_identifiers,
        ),

        # Standard Library Modules for Aglet Modula-2
        'm2iso+aglet': (
            iso_stdlib_module_identifiers,
        ),

        # Standard Library Modules for GNU Modula-2
        'm2pim+gm2': (
            pim_stdlib_module_identifiers,
        ),

        # Standard Library Modules for p1 Modula-2
        'm2iso+p1': (
            iso_stdlib_module_identifiers,
        ),

        # Standard Library Modules for XDS Modula-2
        'm2iso+xds': (
            iso_stdlib_module_identifiers,
        ),
    }

    # Standard Library Types Database
    stdlib_types_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library Types for PIM Modula-2
        'm2pim': (
            pim_stdlib_type_identifiers,
        ),

        # Standard Library Types for ISO Modula-2
        'm2iso': (
            iso_stdlib_type_identifiers,
        ),

        # Standard Library Types for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_type_identifiers,
        ),

        # Standard Library Types for Objective Modula-2
        'objm2': (
            m2r10_stdlib_type_identifiers,
        ),

        # Standard Library Types for Aglet Modula-2
        'm2iso+aglet': (
            iso_stdlib_type_identifiers,
        ),

        # Standard Library Types for GNU Modula-2
        'm2pim+gm2': (
            pim_stdlib_type_identifiers,
        ),

        # Standard Library Types for p1 Modula-2
        'm2iso+p1': (
            iso_stdlib_type_identifiers,
        ),

        # Standard Library Types for XDS Modula-2
        'm2iso+xds': (
            iso_stdlib_type_identifiers,
        ),
    }

    # Standard Library Procedures Database
    stdlib_procedures_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library Procedures for PIM Modula-2
        'm2pim': (
            pim_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for ISO Modula-2
        'm2iso': (
            iso_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for Objective Modula-2
        'objm2': (
            m2r10_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for Aglet Modula-2
        'm2iso+aglet': (
            iso_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for GNU Modula-2
        'm2pim+gm2': (
            pim_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for p1 Modula-2
        'm2iso+p1': (
            iso_stdlib_proc_identifiers,
        ),

        # Standard Library Procedures for XDS Modula-2
        'm2iso+xds': (
            iso_stdlib_proc_identifiers,
        ),
    }

    # Standard Library Variables Database
    stdlib_variables_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library Variables for PIM Modula-2
        'm2pim': (
            pim_stdlib_var_identifiers,
        ),

        # Standard Library Variables for ISO Modula-2
        'm2iso': (
            iso_stdlib_var_identifiers,
        ),

        # Standard Library Variables for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_var_identifiers,
        ),

        # Standard Library Variables for Objective Modula-2
        'objm2': (
            m2r10_stdlib_var_identifiers,
        ),

        # Standard Library Variables for Aglet Modula-2
        'm2iso+aglet': (
            iso_stdlib_var_identifiers,
        ),

        # Standard Library Variables for GNU Modula-2
        'm2pim+gm2': (
            pim_stdlib_var_identifiers,
        ),

        # Standard Library Variables for p1 Modula-2
        'm2iso+p1': (
            iso_stdlib_var_identifiers,
        ),

        # Standard Library Variables for XDS Modula-2
        'm2iso+xds': (
            iso_stdlib_var_identifiers,
        ),
    }

    # Standard Library Constants Database
    stdlib_constants_db = {
        # Empty entry for unknown dialect
        'unknown': (
            # LEAVE THIS EMPTY
        ),
        # Standard Library Constants for PIM Modula-2
        'm2pim': (
            pim_stdlib_const_identifiers,
        ),

        # Standard Library Constants for ISO Modula-2
        'm2iso': (
            iso_stdlib_const_identifiers,
        ),

        # Standard Library Constants for Modula-2 R10
        'm2r10': (
            m2r10_stdlib_const_identifiers,
        ),

        # Standard Library Constants for Objective Modula-2
        'objm2': (
            m2r10_stdlib_const_identifiers,
        ),

        # Standard Library Constants for Aglet Modula-2
        'm2iso+aglet': (
            iso_stdlib_const_identifiers,
        ),

        # Standard Library Constants for GNU Modula-2
        'm2pim+gm2': (
            pim_stdlib_const_identifiers,
        ),

        # Standard Library Constants for p1 Modula-2
        'm2iso+p1': (
            iso_stdlib_const_identifiers,
        ),

        # Standard Library Constants for XDS Modula-2
        'm2iso+xds': (
            iso_stdlib_const_identifiers,
        ),
    }

#   M e t h o d s

    # initialise a lexer instance
    def __init__(self, **options):
        #
        # check dialect options
        #
        dialects = get_list_opt(options, 'dialect', [])
        #
        for dialect_option in dialects:
            if dialect_option in self.dialects[1:-1]:
                # valid dialect option found
                self.set_dialect(dialect_option)
                break
        #
        # Fallback Mode (DEFAULT)
        else:
            # no valid dialect option
            self.set_dialect('unknown')
        #
        self.dialect_set_by_tag = False
        #
        # check style options
        #
        styles = get_list_opt(options, 'style', [])
        #
        # use lowercase mode for Algol style
        if 'algol' in styles or 'algol_nu' in styles:
            self.algol_publication_mode = True
        else:
            self.algol_publication_mode = False
        #
        # Check option flags
        #
        self.treat_stdlib_adts_as_builtins = get_bool_opt(
            options, 'treat_stdlib_adts_as_builtins', True)
        #
        # call superclass initialiser
        RegexLexer.__init__(self, **options)

    # Set lexer to a specified dialect
    def set_dialect(self, dialect_id):
        #
        # if __debug__:
        #    print 'entered set_dialect with arg: ', dialect_id
        #
        # check dialect name against known dialects
        if dialect_id not in self.dialects:
            dialect = 'unknown'  # default
        else:
            dialect = dialect_id
        #
        # compose lexemes to reject set
        lexemes_to_reject_set = set()
        # add each list of reject lexemes for this dialect
        for list in self.lexemes_to_reject_db[dialect]:
            lexemes_to_reject_set.update(set(list))
        #
        # compose reserved words set
        reswords_set = set()
        # add each list of reserved words for this dialect
        for list in self.reserved_words_db[dialect]:
            reswords_set.update(set(list))
        #
        # compose builtins set
        builtins_set = set()
        # add each list of builtins for this dialect excluding reserved words
        for list in self.builtins_db[dialect]:
            builtins_set.update(set(list).difference(reswords_set))
        #
        # compose pseudo-builtins set
        pseudo_builtins_set = set()
        # add each list of builtins for this dialect excluding reserved words
        for list in self.pseudo_builtins_db[dialect]:
            pseudo_builtins_set.update(set(list).difference(reswords_set))
        #
        # compose ADTs set
        adts_set = set()
        # add each list of ADTs for this dialect excluding reserved words
        for list in self.stdlib_adts_db[dialect]:
            adts_set.update(set(list).difference(reswords_set))
        #
        # compose modules set
        modules_set = set()
        # add each list of builtins for this dialect excluding builtins
        for list in self.stdlib_modules_db[dialect]:
            modules_set.update(set(list).difference(builtins_set))
        #
        # compose types set
        types_set = set()
        # add each list of types for this dialect excluding builtins
        for list in self.stdlib_types_db[dialect]:
            types_set.update(set(list).difference(builtins_set))
        #
        # compose procedures set
        procedures_set = set()
        # add each list of procedures for this dialect excluding builtins
        for list in self.stdlib_procedures_db[dialect]:
            procedures_set.update(set(list).difference(builtins_set))
        #
        # compose variables set
        variables_set = set()
        # add each list of variables for this dialect excluding builtins
        for list in self.stdlib_variables_db[dialect]:
            variables_set.update(set(list).difference(builtins_set))
        #
        # compose constants set
        constants_set = set()
        # add each list of constants for this dialect excluding builtins
        for list in self.stdlib_constants_db[dialect]:
            constants_set.update(set(list).difference(builtins_set))
        #
        # update lexer state
        self.dialect = dialect
        self.lexemes_to_reject = lexemes_to_reject_set
        self.reserved_words = reswords_set
        self.builtins = builtins_set
        self.pseudo_builtins = pseudo_builtins_set
        self.adts = adts_set
        self.modules = modules_set
        self.types = types_set
        self.procedures = procedures_set
        self.variables = variables_set
        self.constants = constants_set
        #
        # if __debug__:
        #    print 'exiting set_dialect'
        #    print ' self.dialect: ', self.dialect
        #    print ' self.lexemes_to_reject: ', self.lexemes_to_reject
        #    print ' self.reserved_words: ', self.reserved_words
        #    print ' self.builtins: ', self.builtins
        #    print ' self.pseudo_builtins: ', self.pseudo_builtins
        #    print ' self.adts: ', self.adts
        #    print ' self.modules: ', self.modules
        #    print ' self.types: ', self.types
        #    print ' self.procedures: ', self.procedures
        #    print ' self.variables: ', self.variables
        #    print ' self.types: ', self.types
        #    print ' self.constants: ', self.constants

    # Extracts a dialect name from a dialect tag comment string  and checks
    # the extracted name against known dialects.  If a match is found,  the
    # matching name is returned, otherwise dialect id 'unknown' is returned
    def get_dialect_from_dialect_tag(self, dialect_tag):
        #
        # if __debug__:
        #    print 'entered get_dialect_from_dialect_tag with arg: ', dialect_tag
        #
        # constants
        left_tag_delim = '(*!'
        right_tag_delim = '*)'
        left_tag_delim_len = len(left_tag_delim)
        right_tag_delim_len = len(right_tag_delim)
        indicator_start = left_tag_delim_len
        indicator_end = -(right_tag_delim_len)
        #
        # check comment string for dialect indicator
        if len(dialect_tag) > (left_tag_delim_len + right_tag_delim_len) \
           and dialect_tag.startswith(left_tag_delim) \
           and dialect_tag.endswith(right_tag_delim):
            #
            # if __debug__:
            #    print 'dialect tag found'
            #
            # extract dialect indicator
            indicator = dialect_tag[indicator_start:indicator_end]
            #
            # if __debug__:
            #    print 'extracted: ', indicator
            #
            # check against known dialects
            for index in range(1, len(self.dialects)):
                #
                # if __debug__:
                #    print 'dialects[', index, ']: ', self.dialects[index]
                #
                if indicator == self.dialects[index]:
                    #
                    # if __debug__:
                    #    print 'matching dialect found'
                    #
                    # indicator matches known dialect
                    return indicator
            else:
                # indicator does not match any dialect
                return 'unknown'  # default
        else:
            # invalid indicator string
            return 'unknown'  # default

    # intercept the token stream, modify token attributes and return them
    def get_tokens_unprocessed(self, text):
        for index, token, value in RegexLexer.get_tokens_unprocessed(self, text):
            #
            # check for dialect tag if dialect has not been set by tag
            if not self.dialect_set_by_tag and token == Comment.Special:
                indicated_dialect = self.get_dialect_from_dialect_tag(value)
                if indicated_dialect != 'unknown':
                    # token is a dialect indicator
                    # reset reserved words and builtins
                    self.set_dialect(indicated_dialect)
                    self.dialect_set_by_tag = True
            #
            # check for reserved words, predefined and stdlib identifiers
            if token is Name:
                if value in self.reserved_words:
                    token = Keyword.Reserved
                    if self.algol_publication_mode:
                        value = value.lower()
                #
                elif value in self.builtins:
                    token = Name.Builtin
                    if self.algol_publication_mode:
                        value = value.lower()
                #
                elif value in self.pseudo_builtins:
                    token = Name.Builtin.Pseudo
                    if self.algol_publication_mode:
                        value = value.lower()
                #
                elif value in self.adts:
                    if not self.treat_stdlib_adts_as_builtins:
                        token = Name.Namespace
                    else:
                        token = Name.Builtin.Pseudo
                        if self.algol_publication_mode:
                            value = value.lower()
                #
                elif value in self.modules:
                    token = Name.Namespace
                #
                elif value in self.types:
                    token = Name.Class
                #
                elif value in self.procedures:
                    token = Name.Function
                #
                elif value in self.variables:
                    token = Name.Variable
                #
                elif value in self.constants:
                    token = Name.Constant
            #
            elif token in Number:
                #
                # mark prefix number literals as error for PIM and ISO dialects
                if self.dialect not in ('unknown', 'm2r10', 'objm2'):
                    if "'" in value or value[0:2] in ('0b', '0x', '0u'):
                        token = Error
                #
                elif self.dialect in ('m2r10', 'objm2'):
                    # mark base-8 number literals as errors for M2 R10 and ObjM2
                    if token is Number.Oct:
                        token = Error
                    # mark suffix base-16 literals as errors for M2 R10 and ObjM2
                    elif token is Number.Hex and 'H' in value:
                        token = Error
                    # mark real numbers with E as errors for M2 R10 and ObjM2
                    elif token is Number.Float and 'E' in value:
                        token = Error
            #
            elif token in Comment:
                #
                # mark single line comment as error for PIM and ISO dialects
                if token is Comment.Single:
                    if self.dialect not in ('unknown', 'm2r10', 'objm2'):
                        token = Error
                #
                if token is Comment.Preproc:
                    # mark ISO pragma as error for PIM dialects
                    if value.startswith('<*') and \
                       self.dialect.startswith('m2pim'):
                        token = Error
                    # mark PIM pragma as comment for other dialects
                    elif value.startswith('(*$') and \
                            self.dialect != 'unknown' and \
                            not self.dialect.startswith('m2pim'):
                        token = Comment.Multiline
            #
            else:  # token is neither Name nor Comment
                #
                # mark lexemes matching the dialect's error token set as errors
                if value in self.lexemes_to_reject:
                    token = Error
                #
                # substitute lexemes when in Algol mode
                if self.algol_publication_mode:
                    if value == '#':
                        value = '≠'
                    elif value == '<=':
                        value = '≤'
                    elif value == '>=':
                        value = '≥'
                    elif value == '==':
                        value = '≡'
                    elif value == '*.':
                        value = '•'

            # return result
            yield index, token, value

    def analyse_text(text):
        """It's Pascal-like, but does not use FUNCTION -- uses PROCEDURE
        instead."""

        # Check if this looks like Pascal, if not, bail out early
        if not ('(*' in text and '*)' in text and ':=' in text):
            return

        result = 0
        # Procedure is in Modula2
        if re.search(r'\bPROCEDURE\b', text):
            result += 0.6

        # FUNCTION is only valid in Pascal, but not in Modula2
        if re.search(r'\bFUNCTION\b', text):
            result = 0.0

        return result