summaryrefslogtreecommitdiff
path: root/lisp/progmodes/f90.el
blob: df10b5ecd30258b503804f664280c20099e42743 (plain)
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
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
;;; f90.el --- Fortran-90 mode (free format)

;; Copyright (C) 1995, 1996, 1997, 2000, 2001, 2002, 2003, 2004, 2005,
;;   2006, 2007, 2008  Free Software Foundation, Inc.

;; Author: Torbj\"orn Einarsson <Torbjorn.Einarsson@era.ericsson.se>
;; Maintainer: Glenn Morris <rgm@gnu.org>
;; Keywords: fortran, f90, languages

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Major mode for editing F90 programs in FREE FORMAT.
;; The minor language revision F95 is also supported (with font-locking).
;; Some/many (?) aspects of F2003 are supported.

;; Knows about continuation lines, named structured statements, and other
;; features in F90 including HPF (High Performance Fortran) structures.
;; The basic feature provides accurate indentation of F90 programs.
;; In addition, there are many more features like automatic matching of all
;; end statements, an auto-fill function to break long lines, a join-lines
;; function which joins continued lines, etc.

;; To facilitate typing, a fairly complete list of abbreviations is provided.
;; All abbreviations begin with the backquote character "`"
;; (this requires modification of the syntax-table).
;; For example, `i expands to integer (if abbrev-mode is on).

;; There are two separate features for altering the appearance of code:
;;   1) Upcasing or capitalizing of all keywords.
;;   2) Colors/fonts using font-lock-mode.
;; Automatic upcase or downcase of keywords is controlled by the variable
;; f90-auto-keyword-case.

;; The indentations of lines starting with ! is determined by the first of the
;; following matches (values in the left column are the defaults):

;; start-string/regexp  indent         variable holding start-string/regexp
;;    !!!                  0
;;    !hpf\\$ (re)         0              f90-directive-comment-re
;;    !!$                  0              f90-comment-region
;;    !      (re)        as code          f90-indented-comment-re
;;    default            comment-column

;; Ex: Here is the result of 3 different settings of f90-indented-comment-re
;;     f90-indented-comment-re  !-indentation      !!-indentation
;;          !                    as code             as code
;;          !!                   comment-column      as code
;;          ![^!]                as code             comment-column
;; Trailing comments are indented to comment-column with indent-for-comment.
;; The function f90-comment-region toggles insertion of
;; the variable f90-comment-region in every line of the region.

;; One common convention for free vs. fixed format is that free format files
;; have the ending .f90 or .f95 while fixed format files have the ending .f.
;; Emacs automatically loads Fortran files in the appropriate mode based
;; on extension. You can modify this by adjusting the variable auto-mode-alist.
;; For example:
;; (add-to-list 'auto-mode-alist '("\\.f\\'" . f90-mode))

;; Once you have entered f90-mode, you may get more info by using
;; the command describe-mode (C-h m). For online help use
;; C-h f <Name of function you want described>, or
;; C-h v <Name of variable you want described>.

;; To customize f90-mode for your taste, use, for example:
;; (you don't have to specify values for all the parameters below)
;;
;;(add-hook 'f90-mode-hook
;;      ;; These are the default values.
;;      '(lambda () (setq f90-do-indent 3
;;                        f90-if-indent 3
;;                        f90-type-indent 3
;;                        f90-program-indent 2
;;                        f90-continuation-indent 5
;;                        f90-comment-region "!!$"
;;                        f90-directive-comment-re "!hpf\\$"
;;                        f90-indented-comment-re "!"
;;                        f90-break-delimiters "[-+\\*/><=,% \t]"
;;                        f90-break-before-delimiters t
;;                        f90-beginning-ampersand t
;;                        f90-smart-end 'blink
;;                        f90-auto-keyword-case nil
;;                        f90-leave-line-no nil
;;                        indent-tabs-mode nil
;;                        f90-font-lock-keywords f90-font-lock-keywords-2
;;                  )
;;       ;; These are not default.
;;       (abbrev-mode 1)             ; turn on abbreviation mode
;;       (f90-add-imenu-menu)        ; extra menu with functions etc.
;;       (if f90-auto-keyword-case   ; change case of all keywords on startup
;;           (f90-change-keywords f90-auto-keyword-case))
;;       ))
;;
;; in your .emacs file. You can also customize the lists
;; f90-font-lock-keywords, etc.
;;
;; The auto-fill and abbreviation minor modes are accessible from the F90 menu,
;; or by using M-x auto-fill-mode and M-x abbrev-mode, respectively.

;; Remarks
;; 1) Line numbers are by default left-justified. If f90-leave-line-no is
;;    non-nil, the line numbers are never touched.
;; 2) Multi-; statements like "do i=1,20 ; j=j+i ; end do" are not handled
;;    correctly, but I imagine them to be rare.
;; 3) Regexps for hilit19 are no longer supported.
;; 4) For FIXED FORMAT code, use fortran mode.
;; 5) This mode does not work under emacs-18.x.
;; 6) Preprocessor directives, i.e., lines starting with # are left-justified
;;    and are untouched by all case-changing commands. There is, at present, no
;;    mechanism for treating multi-line directives (continued by \ ).
;; 7) f77 do-loops do 10 i=.. ; ; 10 continue are not correctly indented.
;;    You are urged to use f90-do loops (with labels if you wish).
;; 8) The highlighting mode under XEmacs is not as complete as under Emacs.

;; List of user commands
;;   f90-previous-statement         f90-next-statement
;;   f90-beginning-of-subprogram    f90-end-of-subprogram   f90-mark-subprogram
;;   f90-comment-region
;;   f90-indent-line                f90-indent-new-line
;;   f90-indent-region    (can be called by calling indent-region)
;;   f90-indent-subprogram
;;   f90-break-line                 f90-join-lines
;;   f90-fill-region
;;   f90-insert-end
;;   f90-upcase-keywords            f90-upcase-region-keywords
;;   f90-downcase-keywords          f90-downcase-region-keywords
;;   f90-capitalize-keywords        f90-capitalize-region-keywords
;;   f90-add-imenu-menu
;;   f90-font-lock-1, f90-font-lock-2, f90-font-lock-3, f90-font-lock-4

;; Original author's thanks
;; Thanks to all the people who have tested the mode. Special thanks to Jens
;; Bloch Helmers for encouraging me to write this code, for creative
;; suggestions as well as for the lists of hpf-commands.
;; Also thanks to the authors of the fortran and pascal modes, on which some
;; of this code is built.

;;; Code:

;; TODO
;; 1. Any missing F2003 syntax?
;; 2. Have "f90-mode" just recognize F90 syntax, then derived modes
;; "f95-mode", "f2003-mode" for the language revisions.
;; 3. Support for align.
;; Font-locking:
;; 1. OpenMP, OpenMPI?, preprocessor highlighting.
;; 2. interface blah - Highlight "blah" in function-name face?
;; Need to avoid "interface operator (+)" etc.
;; 3. integer_name = 1
;; 4. Labels for "else" statements (F2003)?

(defvar comment-auto-fill-only-comments)
(defvar font-lock-keywords)

;; User options

(defgroup f90 nil
  "Major mode for editing free format Fortran 90,95 code."
  :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
  :group 'languages)

(defgroup f90-indent nil
  "Indentation in free format Fortran."
  :prefix "f90-"
  :group  'f90)


(defcustom f90-do-indent 3
  "Extra indentation applied to DO blocks."
  :type  'integer
  :group 'f90-indent)
(put 'f90-do-indent 'safe-local-variable 'integerp)

(defcustom f90-if-indent 3
  "Extra indentation applied to IF, SELECT CASE, WHERE and FORALL blocks."
  :type  'integer
  :group 'f90-indent)
(put 'f90-if-indent 'safe-local-variable 'integerp)

(defcustom f90-type-indent 3
  "Extra indentation applied to TYPE, ENUM, INTERFACE and BLOCK DATA blocks."
  :type  'integer
  :group 'f90-indent)
(put 'f90-type-indent 'safe-local-variable 'integerp)

(defcustom f90-program-indent 2
  "Extra indentation applied to PROGRAM, MODULE, SUBROUTINE, FUNCTION blocks."
  :type  'integer
  :group 'f90-indent)
(put 'f90-program-indent 'safe-local-variable 'integerp)

(defcustom f90-associate-indent 2
  "Extra indentation applied to ASSOCIATE blocks."
  :type  'integer
  :group 'f90-indent
  :version "23.1")
(put 'f90-associate-indent 'safe-local-variable 'integerp)

(defcustom f90-continuation-indent 5
  "Extra indentation applied to continuation lines."
  :type  'integer
  :group 'f90-indent)
(put 'f90-continuation-indent 'safe-local-variable 'integerp)

(defcustom f90-comment-region "!!$"
  "String inserted by \\[f90-comment-region] at start of each line in region."
  :type  'string
  :group 'f90-indent)
(put 'f90-comment-region 'safe-local-variable 'stringp)

(defcustom f90-indented-comment-re "!"
  "Regexp matching comments to indent as code."
  :type  'regexp
  :group 'f90-indent)
(put 'f90-indented-comment-re 'safe-local-variable 'stringp)

(defcustom f90-directive-comment-re "!hpf\\$"
  "Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented."
  :type  'regexp
  :group 'f90-indent)
(put 'f90-directive-comment-re 'safe-local-variable 'stringp)

(defcustom f90-beginning-ampersand t
  "Non-nil gives automatic insertion of \& at start of continuation line."
  :type  'boolean
  :group 'f90)
(put 'f90-beginning-ampersand 'safe-local-variable 'booleanp)

(defcustom f90-smart-end 'blink
  "Qualification of END statements according to the matching block start.
For example, the END that closes an IF block is changed to END
IF.  If the block has a label, this is added as well.  Allowed
values are 'blink, 'no-blink, and nil.  If nil, nothing is done.
The other two settings have the same effect, but 'blink
additionally blinks the cursor to the start of the block."
  :type  '(choice (const blink) (const no-blink) (const nil))
  :group 'f90)
(put 'f90-smart-end 'safe-local-variable
     (lambda (value) (memq value '(blink no-blink nil))))

(defcustom f90-break-delimiters "[-+\\*/><=,% \t]"
  "Regexp matching delimiter characters at which lines may be broken.
There are certain tokens comprised entirely of characters
matching this regexp that should not be split, and these are
specified by the constant `f90-no-break-re'."
  :type  'regexp
  :group 'f90)
(put 'f90-break-delimiters 'safe-local-variable 'stringp)

(defcustom f90-break-before-delimiters t
  "Non-nil causes `f90-do-auto-fill' to break lines before delimiters."
  :type  'boolean
  :group 'f90)
(put 'f90-break-before-delimiters 'safe-local-variable 'booleanp)

(defcustom f90-auto-keyword-case nil
  "Automatic case conversion of keywords.
The options are 'downcase-word, 'upcase-word, 'capitalize-word and nil."
  :type  '(choice (const downcase-word) (const upcase-word)
                  (const capitalize-word) (const nil))
  :group 'f90)
(put 'f90-auto-keyword-case 'safe-local-variable
     (lambda (value) (memq value '(downcase-word
                                   capitalize-word upcase-word nil))))

(defcustom f90-leave-line-no nil
  "If non-nil, line numbers are not left justified."
  :type  'boolean
  :group 'f90)
(put 'f90-leave-line-no 'safe-local-variable 'booleanp)

(defcustom f90-mode-hook nil
  "Hook run when entering F90 mode."
  :type    'hook
  :options '(f90-add-imenu-menu)
  :group   'f90)
(put 'f90-mode-hook 'safe-local-variable
     (lambda (value) (member value '((f90-add-imenu-menu) nil))))

;; User options end here.

(defconst f90-keywords-re
  (regexp-opt '("allocatable" "allocate" "assign" "assignment" "backspace"
                "block" "call" "case" "character" "close" "common" "complex"
                "contains" "continue" "cycle" "data" "deallocate"
                "dimension" "do" "double" "else" "elseif" "elsewhere" "end"
                "enddo" "endfile" "endif" "entry" "equivalence" "exit"
                "external" "forall" "format" "function" "goto" "if"
                "implicit" "include" "inquire" "integer" "intent"
                "interface" "intrinsic" "logical" "module" "namelist" "none"
                "nullify" "only" "open" "operator" "optional" "parameter"
                "pause" "pointer" "precision" "print" "private" "procedure"
                "program" "public" "read" "real" "recursive" "result" "return"
                "rewind" "save" "select" "sequence" "stop" "subroutine"
                "target" "then" "type" "use" "where" "while" "write"
                ;; F95 keywords.
                "elemental" "pure"
                ;; F2003
                "abstract" "associate" "asynchronous" "bind" "class"
                "deferred" "enum" "enumerator" "extends" "extends_type_of"
                "final" "generic" "import" "non_intrinsic" "non_overridable"
                "nopass" "pass" "protected" "same_type_as" "value" "volatile"
                ) 'words)
  "Regexp used by the function `f90-change-keywords'.")

(defconst f90-keywords-level-3-re
  (regexp-opt
   '("allocatable" "allocate" "assign" "assignment" "backspace"
     "close" "deallocate" "dimension" "endfile" "entry" "equivalence"
     "external" "inquire" "intent" "intrinsic" "nullify" "only" "open"
     ;; FIXME operator and assignment should be F2003 procedures?
     "operator" "optional" "parameter" "pause" "pointer" "print" "private"
     "public" "read" "recursive" "result" "rewind" "save" "select"
     "sequence" "target" "write"
     ;; F95 keywords.
     "elemental" "pure"
     ;; F2003. asynchronous separate.
     "abstract" "deferred" "import" "final" "non_intrinsic" "non_overridable"
     "nopass" "pass" "protected" "value" "volatile"
     ) 'words)
  "Keyword-regexp for font-lock level >= 3.")

(defconst f90-procedures-re
  (concat "\\<"
          (regexp-opt
           '("abs" "achar" "acos" "adjustl" "adjustr" "aimag" "aint"
             "all" "allocated" "anint" "any" "asin" "associated"
             "atan" "atan2" "bit_size" "btest" "ceiling" "char" "cmplx"
             "conjg" "cos" "cosh" "count" "cshift" "date_and_time" "dble"
             "digits" "dim" "dot_product" "dprod" "eoshift" "epsilon"
             "exp" "exponent" "floor" "fraction" "huge" "iachar" "iand"
             "ibclr" "ibits" "ibset" "ichar" "ieor" "index" "int" "ior"
             "ishft" "ishftc" "kind" "lbound" "len" "len_trim" "lge" "lgt"
             "lle" "llt" "log" "log10" "logical" "matmul" "max"
             "maxexponent" "maxloc" "maxval" "merge" "min" "minexponent"
             "minloc" "minval" "mod" "modulo" "mvbits" "nearest" "nint"
             "not" "pack" "precision" "present" "product" "radix"
             ;; Real is taken out here to avoid highlighting declarations.
             "random_number" "random_seed" "range" ;; "real"
             "repeat" "reshape" "rrspacing" "scale" "scan"
             "selected_int_kind" "selected_real_kind" "set_exponent"
             "shape" "sign" "sin" "sinh" "size" "spacing" "spread" "sqrt"
             "sum" "system_clock" "tan" "tanh" "tiny" "transfer"
             "transpose" "trim" "ubound" "unpack" "verify"
             ;; F95 intrinsic functions.
             "null" "cpu_time"
             ;; F2003.
             "move_alloc" "command_argument_count" "get_command"
             "get_command_argument" "get_environment_variable"
             "selected_char_kind" "wait" "flush" "new_line"
             "extends" "extends_type_of" "same_type_as" "bind"
             ;; F2003 ieee_arithmetic intrinsic module.
             "ieee_support_underflow_control" "ieee_get_underflow_mode"
             "ieee_set_underflow_mode"
             ;; F2003 iso_c_binding intrinsic module.
             "c_loc" "c_funloc" "c_associated" "c_f_pointer"
             "c_f_procpointer"
             ) t)
          ;; A left parenthesis to avoid highlighting non-procedures.
          "[ \t]*(")
  "Regexp whose first part matches F90 intrinsic procedures.")

(defconst f90-operators-re
  (concat "\\."
          (regexp-opt '("and" "eq" "eqv" "false" "ge" "gt" "le" "lt" "ne"
                        "neqv" "not" "or" "true") t)
          "\\.")
  "Regexp matching intrinsic operators.")

(defconst f90-hpf-keywords-re
  (regexp-opt
   ;; Intrinsic procedures.
   '("all_prefix" "all_scatter" "all_suffix" "any_prefix"
     "any_scatter" "any_suffix" "copy_prefix" "copy_scatter"
     "copy_suffix" "count_prefix" "count_scatter" "count_suffix"
     "grade_down" "grade_up"
     "hpf_alignment" "hpf_distribution" "hpf_template" "iall" "iall_prefix"
     "iall_scatter" "iall_suffix" "iany" "iany_prefix" "iany_scatter"
     "iany_suffix" "ilen" "iparity" "iparity_prefix"
     "iparity_scatter" "iparity_suffix" "leadz" "maxval_prefix"
     "maxval_scatter" "maxval_suffix" "minval_prefix" "minval_scatter"
     "minval_suffix" "number_of_processors" "parity"
     "parity_prefix" "parity_scatter" "parity_suffix" "popcnt" "poppar"
     "processors_shape" "product_prefix" "product_scatter"
     "product_suffix" "sum_prefix" "sum_scatter" "sum_suffix"
     ;; Directives.
     "align" "distribute" "dynamic" "independent" "inherit" "processors"
     "realign" "redistribute" "template"
     ;; Keywords.
     "block" "cyclic" "extrinsic" "new" "onto" "pure" "with") 'words)
  "Regexp for all HPF keywords, procedures and directives.")

(defconst f90-constants-re
  (regexp-opt '( ;; F2003 iso_fortran_env constants.
                "iso_fortran_env"
                "input_unit" "output_unit" "error_unit"
                "iostat_end" "iostat_eor"
                "numeric_storage_size" "character_storage_size"
                "file_storage_size"
                ;; F2003 iso_c_binding constants.
                "iso_c_binding"
                "c_int" "c_short" "c_long" "c_long_long" "c_signed_char"
                "c_size_t"
                "c_int8_t" "c_int16_t" "c_int32_t" "c_int64_t"
                "c_int_least8_t" "c_int_least16_t" "c_int_least32_t"
                "c_int_least64_t"
                "c_int_fast8_t" "c_int_fast16_t" "c_int_fast32_t"
                "c_int_fast64_t"
                "c_intmax_t" "c_intptr_t"
                "c_float" "c_double" "c_long_double"
                "c_float_complex" "c_double_complex" "c_long_double_complex"
                "c_bool" "c_char"
                "c_null_char" "c_alert" "c_backspace" "c_form_feed"
                "c_new_line" "c_carriage_return" "c_horizontal_tab"
                "c_vertical_tab"
                "c_ptr" "c_funptr" "c_null_ptr" "c_null_funptr"
                "ieee_exceptions"
                "ieee_arithmetic"
                "ieee_features"
                ) 'words)
  "Regexp for Fortran intrinsic constants.")

;; cf f90-looking-at-type-like.
(defun f90-typedef-matcher (limit)
  "Search for the start/end of the definition of a derived type, up to LIMIT.
Set the match data so that subexpression 1,2 are the TYPE, and
type-name parts, respectively."
  (let (found l)
    (while (and (re-search-forward "\\<\\(\\(?:end[ \t]*\\)?type\\)[ \t]*"
                                   limit t)
                (not (setq found
                           (progn
                             (setq l (match-data))
                             (unless (looking-at "\\(is\\>\\|(\\)")
                               (when (if (looking-at "\\(\\sw+\\)")
                                         (goto-char (match-end 0))
                                       (re-search-forward
                                        "[ \t]*::[ \t]*\\(\\sw+\\)"
                                        (line-end-position) t))
                                 ;; 0 is wrong, but we don't use it.
                                 (set-match-data
                                  (append l (list (match-beginning 1)
                                                  (match-end 1))))
                                 t)))))))
    found))

(defvar f90-font-lock-keywords-1
  (list
   ;; Special highlighting of "module procedure".
   '("\\<\\(module[ \t]*procedure\\)\\>\\([^()\n]*::\\)?[ \t]*\\([^&!\n]*\\)"
     (1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
   ;; Highlight definition of derived type.
;;;    '("\\<\\(\\(?:end[ \t]*\\)?type\\)\\>\\([^()\n]*::\\)?[ \t]*\\(\\sw+\\)"
;;;      (1 font-lock-keyword-face) (3 font-lock-function-name-face))
   '(f90-typedef-matcher
     (1 font-lock-keyword-face) (2 font-lock-function-name-face))
   ;; Other functions and declarations.
   '("\\<\\(\\(?:end[ \t]*\\)?\\(program\\|module\\|function\\|associate\\|\
subroutine\\)\\|use\\|call\\)\\>[ \t]*\\(\\sw+\\)?"
     (1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
   ;; F2003.
   '("\\<\\(use\\)[ \t]*,[ \t]*\\(\\(?:non_\\)?intrinsic\\)[ \t]*::[ \t]*\
\\(\\sw+\\)"
     (1 font-lock-keyword-face) (2 font-lock-keyword-face)
     (3 font-lock-function-name-face))
   "\\<\\(\\(end[ \t]*\\)?block[ \t]*data\\|contains\\|\
end[ \t]*interface\\)\\>"
   ;; "abstract interface" is F2003. Must come after previous entry.
   '("\\<\\(\\(?:abstract[ \t]*\\)?interface\\)\\>"
     ;; [ \t]*\\(\\(\\sw+\\)[ \t]*[^(]\\)?"
     ;; (2) messes up "interface operator ()", etc.
     (1 font-lock-keyword-face))) ;(2 font-lock-function-name-face nil t)))
  "This does fairly subdued highlighting of comments and function calls.")

;; NB not explicitly handling this, yet it seems to work.
;; type(...) function foo()
(defun f90-typedec-matcher (limit)
  "Search for the declaration of variables of derived type, up to LIMIT.
Set the match data so that subexpression 1,2 are the TYPE(...),
and variable-name parts, respectively."
  ;; Matcher functions must return nil only when there are no more
  ;; matches within the search range.
  (let (found l)
    (while (and (re-search-forward "\\<\\(type\\|class\\)[ \t]*(" limit t)
                (not
                 (setq found
                       (condition-case nil
                           (progn
                             ;; Set l after this to just highlight
                             ;; the "type" part.
                             (backward-char 1)
                             ;; Needed for: type( foo(...) ) :: bar
                             (forward-sexp)
                             (setq l (list (match-beginning 0) (point)))
                             (skip-chars-forward " \t")
                             (when
                                 (re-search-forward
                                  ;; type (foo) bar, qux
                                  (if (looking-at "\\sw+")
                                      "\\([^&!\n]+\\)"
                                    ;; type (foo), stuff :: bar, qux
                                    "::[ \t]*\\([^&!\n]+\\)")
                                  (line-end-position) t)
                               (set-match-data
                                (append (list (car l) (match-end 1))
                                        l (list (match-beginning 1)
                                                (match-end 1))))
                               t))
                         (error nil))))))
    found))

(defvar f90-font-lock-keywords-2
  (append
   f90-font-lock-keywords-1
   (list
    ;; Variable declarations (avoid the real function call).
    ;; NB by accident (?), this correctly fontifies the "integer" in:
    ;; integer () function foo ()
    ;; because "() function foo ()" matches \\3.
    ;; The "pure" part does not really belong here, but was added to
    ;; exploit that hack.
    ;; The "function foo" bit is correctly fontified by keywords-1.
    ;; TODO ? actually check for balanced parens in that case.
    '("^[ \t0-9]*\\(?:pure\\|elemental\\)?[ \t]*\
\\(real\\|integer\\|c\\(haracter\\|omplex\\)\\|\
enumerator\\|generic\\|procedure\\|logical\\|double[ \t]*precision\\)\
\\(.*::\\|[ \t]*(.*)\\)?\\([^&!\n]*\\)"
      (1 font-lock-type-face t) (4 font-lock-variable-name-face t))
    ;; Derived type/class variables.
    ;; TODO ? If we just highlighted the "type" part, rather than
    ;; "type(...)", this could be in the previous expression. And this
    ;; would be consistent with integer( kind=8 ), etc.
    '(f90-typedec-matcher
      (1 font-lock-type-face) (2 font-lock-variable-name-face))
    ;; "real function foo (args)". Must override previous.  Note hack
    ;; to get "args" unhighlighted again. Might not always be right,
    ;; but probably better than leaving them as variables.
    ;; NB not explicitly handling this case:
    ;; integer( kind=1 ) function foo()
    ;; thanks to the happy accident described above.
    ;; Not anchored, so don't need to worry about "pure" etc.
    '("\\<\\(\\(real\\|integer\\|c\\(haracter\\|omplex\\)\\|\
logical\\|double[ \t]*precision\\|\
\\(?:type\\|class\\)[ \t]*([ \t]*\\sw+[ \t]*)\\)[ \t]*\\)\
\\(function\\)\\>[ \t]*\\(\\sw+\\)[ \t]*\\(([^&!\n]*)\\)"
      (1 font-lock-type-face t) (4 font-lock-keyword-face t)
      (5 font-lock-function-name-face t) (6 'default t))
    ;; enum (F2003; cf type in -1).
    '("\\<\\(enum\\)\\>\\([^()\n]*::\\)?[ \t]*\\(\\sw+\\)"
      (1 font-lock-keyword-face) (3 font-lock-function-name-face))
    ;; end do, enum (F2003), if, select, where, and forall constructs.
    '("\\<\\(end[ \t]*\\(do\\|if\\|enum\\|select\\|forall\\|where\\)\\)\\>\
\\([ \t]+\\(\\sw+\\)\\)?"
      (1 font-lock-keyword-face) (3 font-lock-constant-face nil t))
    '("^[ \t0-9]*\\(\\(\\sw+\\)[ \t]*:[ \t]*\\)?\\(\\(if\\|\
do\\([ \t]*while\\)?\\|select[ \t]*\\(?:case\\|type\\)\\|where\\|\
forall\\)\\)\\>"
      (2 font-lock-constant-face nil t) (3 font-lock-keyword-face))
    ;; Implicit declaration.
    '("\\<\\(implicit\\)[ \t]*\\(real\\|integer\\|c\\(haracter\\|omplex\\)\
\\|enumerator\\|procedure\\|\
logical\\|double[ \t]*precision\\|type[ \t]*(\\sw+)\\|none\\)[ \t]*"
      (1 font-lock-keyword-face) (2 font-lock-type-face))
    '("\\<\\(namelist\\|common\\)[ \t]*\/\\(\\sw+\\)?\/"
      (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
    "\\<else\\([ \t]*if\\|where\\)?\\>"
    '("\\(&\\)[ \t]*\\(!\\|$\\)"  (1 font-lock-keyword-face))
    "\\<\\(then\\|continue\\|format\\|include\\|stop\\|return\\)\\>"
    '("\\<\\(exit\\|cycle\\)[ \t]*\\(\\sw+\\)?\\>"
      (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
    '("\\<\\(case\\)[ \t]*\\(default\\|(\\)" . 1)
    ;; F2003 "class default".
    '("\\<\\(class\\)[ \t]*default" . 1)
    ;; F2003 "type is" in a "select type" block.
    '("\\<\\(\\(type\\|class\\)[ \t]*is\\)[ \t]*(" (1 font-lock-keyword-face t))
    '("\\<\\(do\\|go[ \t]*to\\)\\>[ \t]*\\([0-9]+\\)"
      (1 font-lock-keyword-face) (2 font-lock-constant-face))
    ;; Line numbers (lines whose first character after number is letter).
    '("^[ \t]*\\([0-9]+\\)[ \t]*[a-z]+" (1 font-lock-constant-face t))))
  "Highlights declarations, do-loops and other constructs.")

(defvar f90-font-lock-keywords-3
  (append f90-font-lock-keywords-2
          (list
           f90-keywords-level-3-re
           f90-operators-re
           (list f90-procedures-re '(1 font-lock-keyword-face keep))
           "\\<real\\>"                 ; avoid overwriting real defs
           ;; As an attribute, but not as an optional argument.
           '("\\<\\(asynchronous\\)[ \t]*[^=]" . 1)
           ))
  "Highlights all F90 keywords and intrinsic procedures.")

(defvar f90-font-lock-keywords-4
  (append f90-font-lock-keywords-3
          (list (cons f90-constants-re 'font-lock-constant-face)
                f90-hpf-keywords-re))
  "Highlights all F90 and HPF keywords and constants.")

(defvar f90-font-lock-keywords
  f90-font-lock-keywords-2
  "*Default expressions to highlight in F90 mode.
Can be overridden by the value of `font-lock-maximum-decoration'.")


(defvar f90-mode-syntax-table
  (let ((table (make-syntax-table)))
    (modify-syntax-entry ?\! "<"  table) ; begin comment
    (modify-syntax-entry ?\n ">"  table) ; end comment
    (modify-syntax-entry ?_  "w"  table) ; underscore in names
    (modify-syntax-entry ?\' "\"" table) ; string quote
    (modify-syntax-entry ?\" "\"" table) ; string quote
    (modify-syntax-entry ?\` "w"  table) ; for abbrevs
    (modify-syntax-entry ?\r " "  table) ; return is whitespace
    (modify-syntax-entry ?+  "."  table) ; punctuation
    (modify-syntax-entry ?-  "."  table)
    (modify-syntax-entry ?=  "."  table)
    (modify-syntax-entry ?*  "."  table)
    (modify-syntax-entry ?/  "."  table)
    ;; I think that the f95 standard leaves the behaviour of \
    ;; unspecified, but that f2k will require it to be non-special.
    ;; Use `f90-backslash-not-special' to change.
    (modify-syntax-entry ?\\ "\\" table) ; escape chars
    table)
  "Syntax table used in F90 mode.")

(defvar f90-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map "`"        'f90-abbrev-start)
    (define-key map "\C-c;"    'f90-comment-region)
    (define-key map "\C-\M-a"  'f90-beginning-of-subprogram)
    (define-key map "\C-\M-e"  'f90-end-of-subprogram)
    (define-key map "\C-\M-h"  'f90-mark-subprogram)
    (define-key map "\C-\M-n"  'f90-end-of-block)
    (define-key map "\C-\M-p"  'f90-beginning-of-block)
    (define-key map "\C-\M-q"  'f90-indent-subprogram)
    (define-key map "\C-j"     'f90-indent-new-line) ; LFD equals C-j
    (define-key map "\r"       'newline)
    (define-key map "\C-c\r"   'f90-break-line)
;;;  (define-key map [M-return] 'f90-break-line)
    (define-key map "\C-c\C-a" 'f90-previous-block)
    (define-key map "\C-c\C-e" 'f90-next-block)
    (define-key map "\C-c\C-d" 'f90-join-lines)
    (define-key map "\C-c\C-f" 'f90-fill-region)
    (define-key map "\C-c\C-p" 'f90-previous-statement)
    (define-key map "\C-c\C-n" 'f90-next-statement)
    (define-key map "\C-c\C-w" 'f90-insert-end)
    (define-key map "\t"       'f90-indent-line)
    (define-key map ","        'f90-electric-insert)
    (define-key map "+"        'f90-electric-insert)
    (define-key map "-"        'f90-electric-insert)
    (define-key map "*"        'f90-electric-insert)
    (define-key map "/"        'f90-electric-insert)

    (easy-menu-define f90-menu map "Menu for F90 mode."
      `("F90"
        ("Customization"
         ,(custom-menu-create 'f90)
         ["Set"  Custom-set t]
         ["Save" Custom-save t]
         ["Reset to Current" Custom-reset-current t]
         ["Reset to Saved"   Custom-reset-saved t]
         ["Reset to Standard Settings" Custom-reset-standard t]
         )
        "--"
        ["Indent Subprogram"       f90-indent-subprogram       t]
        ["Mark Subprogram"         f90-mark-subprogram         t]
        ["Beginning of Subprogram" f90-beginning-of-subprogram t]
        ["End of Subprogram"       f90-end-of-subprogram       t]
        "--"
        ["(Un)Comment Region" f90-comment-region mark-active]
        ["Indent Region"      f90-indent-region  mark-active]
        ["Fill Region"        f90-fill-region    mark-active]
        "--"
        ["Break Line at Point"     f90-break-line t]
        ["Join with Previous Line" f90-join-lines t]
        ["Insert Block End"        f90-insert-end t]
        "--"
        ("Highlighting"
         ["Toggle font-lock-mode" font-lock-mode :selected font-lock-mode
          :style toggle]
         "--"
         ["Light highlighting (level 1)"    f90-font-lock-1 t]
         ["Moderate highlighting (level 2)" f90-font-lock-2 t]
         ["Heavy highlighting (level 3)"    f90-font-lock-3 t]
         ["Maximum highlighting (level 4)"  f90-font-lock-4 t]
         )
        ("Change Keyword Case"
         ["Upcase Keywords (buffer)"     f90-upcase-keywords     t]
         ["Capitalize Keywords (buffer)" f90-capitalize-keywords t]
         ["Downcase Keywords (buffer)"   f90-downcase-keywords   t]
         "--"
         ["Upcase Keywords (region)"     f90-upcase-region-keywords
          mark-active]
         ["Capitalize Keywords (region)" f90-capitalize-region-keywords
          mark-active]
         ["Downcase Keywords (region)"   f90-downcase-region-keywords
          mark-active]
         )
        "--"
        ["Toggle auto-fill"   auto-fill-mode :selected auto-fill-function
         :style toggle]
        ["Toggle abbrev-mode" abbrev-mode    :selected abbrev-mode
         :style toggle]
        ["Add imenu Menu" f90-add-imenu-menu
         :active   (not (lookup-key (current-local-map) [menu-bar index]))
         :included (fboundp 'imenu-add-to-menubar)]))
    map)
  "Keymap used in F90 mode.")


(defun f90-font-lock-1 ()
  "Set `font-lock-keywords' to `f90-font-lock-keywords-1'."
  (interactive)
  (font-lock-mode 1)
  (setq font-lock-keywords f90-font-lock-keywords-1)
  (font-lock-fontify-buffer))

(defun f90-font-lock-2 ()
  "Set `font-lock-keywords' to `f90-font-lock-keywords-2'."
  (interactive)
  (font-lock-mode 1)
  (setq font-lock-keywords f90-font-lock-keywords-2)
  (font-lock-fontify-buffer))

(defun f90-font-lock-3 ()
  "Set `font-lock-keywords' to `f90-font-lock-keywords-3'."
  (interactive)
  (font-lock-mode 1)
  (setq font-lock-keywords f90-font-lock-keywords-3)
  (font-lock-fontify-buffer))

(defun f90-font-lock-4 ()
  "Set `font-lock-keywords' to `f90-font-lock-keywords-4'."
  (interactive)
  (font-lock-mode 1)
  (setq font-lock-keywords f90-font-lock-keywords-4)
  (font-lock-fontify-buffer))


;; Regexps for finding program structures.
(defconst f90-blocks-re
  (concat "\\(block[ \t]*data\\|"
          (regexp-opt '("do" "if" "interface" "function" "module" "program"
                        "select" "subroutine" "type" "where" "forall"
                        ;; F2003.
                        "enum" "associate"))
          "\\)\\>")
  "Regexp potentially indicating a \"block\" of F90 code.")

(defconst f90-program-block-re
  (regexp-opt '("program" "module" "subroutine" "function") 'paren)
  "Regexp used to locate the start/end of a \"subprogram\".")

;; "class is" is F2003.
(defconst f90-else-like-re
  "\\(else\\([ \t]*if\\|where\\)?\\|case[ \t]*\\(default\\|(\\)\\|\
\\(class\\|type\\)[ \t]*is[ \t]*(\\|class[ \t]*default\\)"
  "Regexp matching an ELSE IF, ELSEWHERE, CASE, CLASS/TYPE IS statement.")

(defconst f90-end-if-re
  (concat "end[ \t]*"
          (regexp-opt '("if" "select" "where" "forall") 'paren)
          "\\>")
  "Regexp matching the end of an IF, SELECT, WHERE, FORALL block.")

(defconst f90-end-type-re
  "end[ \t]*\\(type\\|enum\\|interface\\|block[ \t]*data\\)\\>"
  "Regexp matching the end of a TYPE, ENUM, INTERFACE, BLOCK DATA section.")

(defconst f90-end-associate-re
  "end[ \t]*associate\\>"
  "Regexp matching the end of an ASSOCIATE block.")

;; This is for a TYPE block, not a variable of derived TYPE.
;; Hence no need to add CLASS for F2003.
(defconst f90-type-def-re
  ;; type word
  ;; type :: word
  ;; type, stuff :: word
  ;; NOT "type ("
  "\\<\\(type\\)\\>\\(?:[^()\n]*::\\)?[ \t]*\\(\\sw+\\)"
  "Regexp matching the definition of a derived type.")

(defconst f90-typeis-re
  "\\<\\(class\\|type\\)[ \t]*is[ \t]*("
  "Regexp matching a CLASS/TYPE IS statement.")

(defconst f90-no-break-re
  (regexp-opt '("**" "//" "=>" ">=" "<=" "==" "/=") 'paren)
  "Regexp specifying where not to break lines when filling.
This regexp matches certain tokens comprised entirely of
characters matching the regexp `f90-break-delimiters' that should
not be split by filling.  Each element is assumed to be two
characters long.")

(defvar f90-cache-position nil
  "Temporary position used to speed up region operations.")
(make-variable-buffer-local 'f90-cache-position)


;; Hideshow support.
(defconst f90-end-block-re
  (concat "^[ \t0-9]*\\<end[ \t]*"
          (regexp-opt '("do" "if" "forall" "function" "interface"
                        "module" "program" "select" "subroutine"
                        "type" "where" "enum" "associate") t)
          "\\>")
  "Regexp matching the end of an F90 \"block\", from the line start.
Used in the F90 entry in `hs-special-modes-alist'.")

;; Ignore the fact that FUNCTION, SUBROUTINE, WHERE, FORALL have a
;; following "(".  DO, CASE, IF can have labels.
(defconst f90-start-block-re
  (concat
   "^[ \t0-9]*"                         ; statement number
   "\\(\\("
   "\\(\\sw+[ \t]*:[ \t]*\\)?"          ; structure label
   "\\(do\\|select[ \t]*\\(case\\|type\\)\\|"
   ;; See comments in fortran-start-block-re for the problems of IF.
   "if[ \t]*(\\(.*\\|"
   ".*\n\\([^if]*\\([^i].\\|.[^f]\\|.\\>\\)\\)\\)\\<then\\|"
   ;; Distinguish WHERE block from isolated WHERE.
   "\\(where\\|forall\\)[ \t]*(.*)[ \t]*\\(!\\|$\\)\\)\\)"
   "\\|"
   ;; Avoid F2003 "type is" in "select type",
   ;; and also variables of derived type "type (foo)".
   ;; "type, foo" must be a block (?).
   "type[ \t,]\\("
   "[^i(!\n\"\& \t]\\|"                 ; not-i(
   "i[^s!\n\"\& \t]\\|"                 ; i not-s
   "is\\sw\\)\\|"
   ;; "abstract interface" is F2003.
   "program\\|\\(?:abstract[ \t]*\\)?interface\\|module\\|"
   ;; "enum", but not "enumerator".
   "function\\|subroutine\\|enum[^e]\\|associate"
   "\\)"
   "[ \t]*")
  "Regexp matching the start of an F90 \"block\", from the line start.
A simple regexp cannot do this in fully correct fashion, so this
tries to strike a compromise between complexity and flexibility.
Used in the F90 entry in `hs-special-modes-alist'.")

;; hs-special-modes-alist is autoloaded.
(add-to-list 'hs-special-modes-alist
             `(f90-mode ,f90-start-block-re ,f90-end-block-re
                        "!" f90-end-of-block nil))


;; Imenu support.
;; FIXME trivial to extend this to enum. Worth it?
(defun f90-imenu-type-matcher ()
  "Search backward for the start of a derived type.
Set subexpression 1 in the match-data to the name of the type."
  (let (found l)
    (while (and (re-search-backward "^[ \t0-9]*type[ \t]*" nil t)
                (not (setq found
                           (save-excursion
                             (goto-char (match-end 0))
                             (unless (looking-at "\\(is\\>\\|(\\)")
                               (or (looking-at "\\(\\sw+\\)")
                                   (re-search-forward
                                    "[ \t]*::[ \t]*\\(\\sw+\\)"
                                    (line-end-position) t))))))))
    found))

(defvar f90-imenu-generic-expression
  (let ((good-char "[^!\"\&\n \t]") (not-e "[^e!\n\"\& \t]")
        (not-n "[^n!\n\"\& \t]") (not-d "[^d!\n\"\& \t]")
        (not-ib "[^i(!\n\"\& \t]") (not-s "[^s!\n\"\& \t]"))
    (list
     '(nil "^[ \t0-9]*program[ \t]+\\(\\sw+\\)" 1)
     '("Modules" "^[ \t0-9]*module[ \t]+\\(\\sw+\\)[ \t]*\\(!\\|$\\)" 1)
     (list "Types" 'f90-imenu-type-matcher 1)
     ;; Does not handle: "type[, stuff] :: foo".
;;;      (format "^[ \t0-9]*type[ \t]+\\(\\(%s\\|i%s\\|is\\sw\\)\\sw*\\)"
;;;              not-ib not-s)
;;;      1)
     ;; Can't get the subexpression numbers to match in the two branches.
;;;      (format "^[ \t0-9]*type\\([ \t]*,.*\\(::\\)[ \t]*\\(\\sw+\\)\\|[ \t]+\\(\\(%s\\|i%s\\|is\\sw\\)\\sw*\\)\\)" not-ib not-s)
;;;      3)
     (list
      "Procedures"
      (concat
       "^[ \t0-9]*"
       "\\("
       ;; At least three non-space characters before function/subroutine.
       ;; Check that the last three non-space characters do not spell E N D.
       "[^!\"\&\n]*\\("
       not-e good-char good-char "\\|"
       good-char not-n good-char "\\|"
       good-char good-char not-d "\\)"
       "\\|"
       ;; Less than three non-space characters before function/subroutine.
       good-char "?" good-char "?"
       "\\)"
       "[ \t]*\\(function\\|subroutine\\)[ \t]+\\(\\sw+\\)")
      4)))
  "Value for `imenu-generic-expression' in F90 mode.")

(defun f90-add-imenu-menu ()
  "Add an imenu menu to the menubar."
  (interactive)
  (if (lookup-key (current-local-map) [menu-bar index])
      (message "%s" "F90-imenu already exists.")
    (imenu-add-to-menubar "F90-imenu")
    (redraw-frame (selected-frame))))


;; Abbrevs have generally two letters, except standard types `c, `i, `r, `t.
(defvar f90-mode-abbrev-table
  (progn
    (define-abbrev-table 'f90-mode-abbrev-table nil)
    f90-mode-abbrev-table)
  "Abbrev table for F90 mode.")

(let (abbrevs-changed)
  ;; Use the 6th arg (SYSTEM-FLAG) of define-abbrev if possible.
  ;; A little baroque to quieten the byte-compiler.
  (mapc
   (function (lambda (element)
               (condition-case nil
                   (apply 'define-abbrev f90-mode-abbrev-table
                          (append element '(nil 0 t)))
                 (wrong-number-of-arguments
                  (apply 'define-abbrev f90-mode-abbrev-table
                         (append element '(nil 0)))))))
   '(("`al"  "allocate"     )
     ("`ab"  "allocatable"  )
     ("`ai"  "abstract interface")
     ("`as"  "assignment"   )
     ("`asy" "asynchronous" )
     ("`ba"  "backspace"    )
     ("`bd"  "block data"   )
     ("`c"   "character"    )
     ("`cl"  "close"        )
     ("`cm"  "common"       )
     ("`cx"  "complex"      )
     ("`cn"  "contains"     )
     ("`cy"  "cycle"        )
     ("`de"  "deallocate"   )
     ("`df"  "define"       )
     ("`di"  "dimension"    )
     ("`dp"  "double precision")
     ("`dw"  "do while"     )
     ("`el"  "else"         )
     ("`eli" "else if"      )
     ("`elw" "elsewhere"    )
     ("`em"  "elemental"    )
     ("`e"   "enumerator"   )
     ("`eq"  "equivalence"  )
     ("`ex"  "external"     )
     ("`ey"  "entry"        )
     ("`fl"  "forall"       )
     ("`fo"  "format"       )
     ("`fu"  "function"     )
     ("`fa"  ".false."      )
     ("`im"  "implicit none")
     ("`in"  "include"      )
     ("`i"   "integer"      )
     ("`it"  "intent"       )
     ("`if"  "interface"    )
     ("`lo"  "logical"      )
     ("`mo"  "module"       )
     ("`na"  "namelist"     )
     ("`nu"  "nullify"      )
     ("`op"  "optional"     )
     ("`pa"  "parameter"    )
     ("`po"  "pointer"      )
     ("`pr"  "print"        )
     ("`pi"  "private"      )
     ("`pm"  "program"      )
     ("`pr"  "protected"    )
     ("`pu"  "public"       )
     ("`r"   "real"         )
     ("`rc"  "recursive"    )
     ("`rt"  "return"       )
     ("`rw"  "rewind"       )
     ("`se"  "select"       )
     ("`sq"  "sequence"     )
     ("`su"  "subroutine"   )
     ("`ta"  "target"       )
     ("`tr"  ".true."       )
     ("`t"   "type"         )
     ("`vo"  "volatile"     )
     ("`wh"  "where"        )
     ("`wr"  "write"        ))))


;;;###autoload
(defun f90-mode ()
  "Major mode for editing Fortran 90,95 code in free format.
For fixed format code, use `fortran-mode'.

\\[f90-indent-line] indents the current line.
\\[f90-indent-new-line] indents current line and creates a new\
 indented line.
\\[f90-indent-subprogram] indents the current subprogram.

Type `? or `\\[help-command] to display a list of built-in\
 abbrevs for F90 keywords.

Key definitions:
\\{f90-mode-map}

Variables controlling indentation style and extra features:

`f90-do-indent'
  Extra indentation within do blocks (default 3).
`f90-if-indent'
  Extra indentation within if/select/where/forall blocks (default 3).
`f90-type-indent'
  Extra indentation within type/enum/interface/block-data blocks (default 3).
`f90-program-indent'
  Extra indentation within program/module/subroutine/function blocks
  (default 2).
`f90-continuation-indent'
  Extra indentation applied to continuation lines (default 5).
`f90-comment-region'
  String inserted by function \\[f90-comment-region] at start of each
  line in region (default \"!!!$\").
`f90-indented-comment-re'
  Regexp determining the type of comment to be intended like code
  (default \"!\").
`f90-directive-comment-re'
  Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented
  (default \"!hpf\\\\$\").
`f90-break-delimiters'
  Regexp holding list of delimiters at which lines may be broken
  (default \"[-+*/><=,% \\t]\").
`f90-break-before-delimiters'
  Non-nil causes `f90-do-auto-fill' to break lines before delimiters
  (default t).
`f90-beginning-ampersand'
  Automatic insertion of \& at beginning of continuation lines (default t).
`f90-smart-end'
  From an END statement, check and fill the end using matching block start.
  Allowed values are 'blink, 'no-blink, and nil, which determine
  whether to blink the matching beginning (default 'blink).
`f90-auto-keyword-case'
  Automatic change of case of keywords (default nil).
  The possibilities are 'downcase-word, 'upcase-word, 'capitalize-word.
`f90-leave-line-no'
  Do not left-justify line numbers (default nil).

Turning on F90 mode calls the value of the variable `f90-mode-hook'
with no args, if that value is non-nil."
  (interactive)
  (kill-all-local-variables)
  (setq major-mode 'f90-mode
        mode-name "F90"
        local-abbrev-table f90-mode-abbrev-table)
  (set-syntax-table f90-mode-syntax-table)
  (use-local-map f90-mode-map)
  (set (make-local-variable 'indent-line-function) 'f90-indent-line)
  (set (make-local-variable 'indent-region-function) 'f90-indent-region)
  (set (make-local-variable 'require-final-newline) mode-require-final-newline)
  (set (make-local-variable 'comment-start) "!")
  (set (make-local-variable 'comment-start-skip) "!+ *")
  (set (make-local-variable 'comment-indent-function) 'f90-comment-indent)
  (set (make-local-variable 'abbrev-all-caps) t)
  (set (make-local-variable 'normal-auto-fill-function) 'f90-do-auto-fill)
  (setq indent-tabs-mode nil)           ; auto buffer local
  (set (make-local-variable 'font-lock-defaults)
       '((f90-font-lock-keywords f90-font-lock-keywords-1
                                 f90-font-lock-keywords-2
                                 f90-font-lock-keywords-3
                                 f90-font-lock-keywords-4)
         nil t))
  (set (make-local-variable 'imenu-case-fold-search) t)
  (set (make-local-variable 'imenu-generic-expression)
       f90-imenu-generic-expression)
  (set (make-local-variable 'beginning-of-defun-function)
       'f90-beginning-of-subprogram)
  (set (make-local-variable 'end-of-defun-function) 'f90-end-of-subprogram)
  (set (make-local-variable 'add-log-current-defun-function)
       #'f90-current-defun)
  (run-mode-hooks 'f90-mode-hook))


;; Inline-functions.
(defsubst f90-in-string ()
  "Return non-nil if point is inside a string.
Checks from `point-min', or `f90-cache-position', if that is non-nil
and lies before point."
  (let ((beg-pnt
         (if (and f90-cache-position (> (point) f90-cache-position))
             f90-cache-position
           (point-min))))
    (nth 3 (parse-partial-sexp beg-pnt (point)))))

(defsubst f90-in-comment ()
  "Return non-nil if point is inside a comment.
Checks from `point-min', or `f90-cache-position', if that is non-nil
and lies before point."
  (let ((beg-pnt
         (if (and f90-cache-position (> (point) f90-cache-position))
             f90-cache-position
           (point-min))))
    (nth 4 (parse-partial-sexp beg-pnt (point)))))

(defsubst f90-line-continued ()
  "Return t if the current line is a continued one.
This includes comment lines embedded in continued lines, but
not the last line of a continued statement."
  (save-excursion
    (beginning-of-line)
    (while (and (looking-at "[ \t]*\\(!\\|$\\)") (zerop (forward-line -1))))
    (end-of-line)
    (while (f90-in-comment)
      (search-backward "!" (line-beginning-position))
      (skip-chars-backward "!"))
    (skip-chars-backward " \t")
    (= (preceding-char) ?&)))

;; GM this is not right, eg a continuation line starting with a number.
;; Need f90-code-start-position function.
;; And yet, things seems to work with this...
;; cf f90-indent-line
;;     (beginning-of-line)           ; digits after & \n are not line-nos
;;     (if (not (save-excursion (and (f90-previous-statement)
;;                                   (f90-line-continued))))
;;         (f90-indent-line-no)
(defsubst f90-current-indentation ()
  "Return indentation of current line.
Line-numbers are considered whitespace characters."
  (save-excursion (beginning-of-line) (skip-chars-forward " \t0-9")))

(defsubst f90-indent-to (col &optional no-line-number)
  "Indent current line to column COL.
If optional argument NO-LINE-NUMBER is nil, jump over a possible
line-number before indenting."
  (beginning-of-line)
  (or no-line-number
      (skip-chars-forward " \t0-9"))
  (delete-horizontal-space)
  ;; Leave >= 1 space after line number.
  (indent-to col (if (zerop (current-column)) 0 1)))

(defsubst f90-get-present-comment-type ()
  "If point lies within a comment, return the string starting the comment.
For example, \"!\" or \"!!\", followed by the appropriate amount of
whitespace, if any."
  ;; Include the whitespace for consistent auto-filling of comment blocks.
  (save-excursion
    (when (f90-in-comment)
      (beginning-of-line)
      (re-search-forward "!+[ \t]*" (line-end-position))
      (while (f90-in-string)
        (re-search-forward "!+[ \t]*" (line-end-position)))
      (match-string-no-properties 0))))

(defsubst f90-equal-symbols (a b)
  "Compare strings A and B neglecting case and allowing for nil value."
  (equal (if a (downcase a) nil)
         (if b (downcase b) nil)))

(defsubst f90-looking-at-do ()
  "Return (\"do\" NAME) if a do statement starts after point.
NAME is nil if the statement has no label."
  (if (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\\(do\\)\\>")
      (list (match-string 3) (match-string 2))))

(defsubst f90-looking-at-select-case ()
  "Return (\"select\" NAME) if a select statement starts after point.
NAME is nil if the statement has no label."
  (if (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\
\\(select\\)[ \t]*\\(case\\|type\\)[ \t]*(")
      (list (match-string 3) (match-string 2))))

(defsubst f90-looking-at-if-then ()
  "Return (\"if\" NAME) if an if () then statement starts after point.
NAME is nil if the statement has no label."
  (save-excursion
    (when (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\\(if\\)\\>")
      (let ((struct (match-string 3))
            (label (match-string 2))
            (pos (scan-lists (point) 1 0)))
        (and pos (goto-char pos))
        (skip-chars-forward " \t")
        (if (or (looking-at "then\\>")
                (when (f90-line-continued)
                  (f90-next-statement)
                  (skip-chars-forward " \t0-9&")
                  (looking-at "then\\>")))
            (list struct label))))))

;; FIXME label?
(defsubst f90-looking-at-associate ()
  "Return (\"associate\") if an associate block starts after point."
  (if (looking-at "\\<\\(associate\\)[ \t]*(")
      (list (match-string 1))))

(defsubst f90-looking-at-where-or-forall ()
  "Return (KIND NAME) if a where or forall block starts after point.
NAME is nil if the statement has no label."
  (save-excursion
    (when (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\
\\(where\\|forall\\)\\>")
      (let ((struct (match-string 3))
            (label (match-string 2))
            (pos (scan-lists (point) 1 0)))
        (and pos (goto-char pos))
        (skip-chars-forward " \t")
        (if (looking-at "\\(!\\|$\\)") (list struct label))))))

(defsubst f90-looking-at-type-like ()
  "Return (KIND NAME) if a type/enum/interface/block-data starts after point.
NAME is non-nil only for type."
  (cond
   ((save-excursion
      (and (looking-at "\\<type[ \t]*")
           (goto-char (match-end 0))
           (not (looking-at "\\(is\\>\\|(\\)"))
           (or (looking-at "\\(\\sw+\\)")
               (re-search-forward "[ \t]*::[ \t]*\\(\\sw+\\)"
                                  (line-end-position) t))))
    (list "type" (match-string 1)))
;;;    ((and (not (looking-at f90-typeis-re))
;;;          (looking-at f90-type-def-re))
;;;     (list (match-string 1) (match-string 2)))
   ((looking-at "\\(enum\\|interface\\|block[ \t]*data\\)\\>")
    (list (match-string 1) nil))
   ((looking-at "abstract[ \t]*\\(interface\\)\\>")
    (list (match-string 1) nil))))

(defsubst f90-looking-at-program-block-start ()
  "Return (KIND NAME) if a program block with name NAME starts after point."
;;;NAME is nil for an un-named main PROGRAM block."
  (cond
   ((looking-at "\\(program\\)[ \t]+\\(\\sw+\\)\\>")
    (list (match-string 1) (match-string 2)))
   ((and (not (looking-at "module[ \t]*procedure\\>"))
         (looking-at "\\(module\\)[ \t]+\\(\\sw+\\)\\>"))
    (list (match-string 1) (match-string 2)))
   ((and (not (looking-at "end[ \t]*\\(function\\|subroutine\\)"))
         (looking-at "[^!'\"\&\n]*\\(function\\|subroutine\\)[ \t]+\
\\(\\sw+\\)"))
    (list (match-string 1) (match-string 2)))))
;; Following will match an un-named main program block; however
;; one needs to check if there is an actual PROGRAM statement after
;; point (and before any END program). Adding this will require
;; change to eg f90-calculate-indent.
;;;   ((save-excursion
;;;     (not (f90-previous-statement)))
;;;    '("program" nil))))

(defsubst f90-looking-at-program-block-end ()
  "Return (KIND NAME) if a block with name NAME ends after point."
  (if (looking-at (concat "end[ \t]*" f90-blocks-re
                          "?\\([ \t]+\\(\\sw+\\)\\)?\\>"))
      (list (match-string 1) (match-string 3))))

(defsubst f90-comment-indent ()
  "Return the indentation to be used for a comment starting at point.
Used for `comment-indent-function' by F90 mode.
\"!!!\", `f90-directive-comment-re', variable `f90-comment-region' return 0.
`f90-indented-comment-re' (if not trailing code) calls `f90-calculate-indent'.
All others return `comment-column', leaving at least one space after code."
  (cond ((looking-at "!!!") 0)
        ((and f90-directive-comment-re
              (looking-at f90-directive-comment-re)) 0)
        ((looking-at (regexp-quote f90-comment-region)) 0)
        ((and (looking-at f90-indented-comment-re)
              ;; Don't attempt to indent trailing comment as code.
              (save-excursion
                (skip-chars-backward " \t")
                (bolp)))
         (f90-calculate-indent))
        (t (save-excursion
             (skip-chars-backward " \t")
             (max (if (bolp) 0 (1+ (current-column))) comment-column)))))

(defsubst f90-present-statement-cont ()
  "Return continuation properties of present statement.
Possible return values are:
single - statement is not continued.
begin  - current line is the first in a continued statement.
end    - current line is the last in a continued statement
middle - current line is neither first nor last in a continued statement.
Comment lines embedded amongst continued lines return 'middle."
  (let (pcont cont)
    (save-excursion
      (setq pcont (if (f90-previous-statement) (f90-line-continued))))
    (setq cont (f90-line-continued))
    (cond ((and (not pcont) (not cont)) 'single)
          ((and (not pcont) cont)       'begin)
          ((and pcont       (not cont)) 'end)
          ((and pcont       cont)       'middle)
          (t (error "The impossible occurred")))))

(defsubst f90-indent-line-no ()
  "If `f90-leave-line-no' is nil, left-justify a line number.
Leaves point at the first non-blank character after the line number.
Call from beginning of line."
  (and (null f90-leave-line-no) (looking-at "[ \t]+[0-9]")
       (delete-horizontal-space))
  (skip-chars-forward " \t0-9"))

(defsubst f90-no-block-limit ()
  "Return nil if point is at the edge of a code block.
Searches line forward for \"function\" or \"subroutine\",
if all else fails."
  (save-excursion
    (not (or (looking-at "end")
             (looking-at "\\(do\\|if\\|else\\(if\\|where\\)?\
\\|select[ \t]*\\(case\\|type\\)\\|case\\|where\\|forall\\)\\>")
             (looking-at "\\(program\\|module\\|\
\\(?:abstract[ \t]*\\)?interface\\|block[ \t]*data\\)\\>")
             (looking-at "\\(contains\\|\\sw+[ \t]*:\\)")
             (looking-at f90-type-def-re)
             (re-search-forward "\\(function\\|subroutine\\)"
                                (line-end-position) t)))))

(defsubst f90-update-line ()
  "Change case of current line as per `f90-auto-keyword-case'."
  (if f90-auto-keyword-case
      (f90-change-keywords f90-auto-keyword-case
                           (line-beginning-position) (line-end-position))))

(defun f90-electric-insert (&optional arg)
  "Change keyword case and auto-fill line as operators are inserted."
  (interactive "*p")
  (self-insert-command arg)
  (if auto-fill-function (f90-do-auto-fill) ; also updates line
    (f90-update-line)))


(defun f90-get-correct-indent ()
  "Get correct indent for a line starting with line number.
Does not check type and subprogram indentation."
  (let ((epnt (line-end-position)) icol cont)
    (save-excursion
      (while (and (f90-previous-statement)
                  (or (progn
                        (setq cont (f90-present-statement-cont))
                        (or (eq cont 'end) (eq cont 'middle)))
                      (looking-at "[ \t]*[0-9]"))))
      (setq icol (current-indentation))
      (beginning-of-line)
      (when (re-search-forward "\\(if\\|do\\|select\\|where\\|forall\\)"
                               (line-end-position) t)
        (beginning-of-line)
        (skip-chars-forward " \t")
        (cond ((f90-looking-at-do)
               (setq icol (+ icol f90-do-indent)))
              ((or (f90-looking-at-if-then)
                   (f90-looking-at-where-or-forall)
                   (f90-looking-at-select-case))
               (setq icol (+ icol f90-if-indent)))
              ((f90-looking-at-associate)
               (setq icol (+ icol f90-associate-indent))))
        (end-of-line))
      (while (re-search-forward
              "\\(if\\|do\\|select\\|where\\|forall\\)" epnt t)
        (beginning-of-line)
        (skip-chars-forward " \t0-9")
        (cond ((f90-looking-at-do)
               (setq icol (+ icol f90-do-indent)))
              ((or (f90-looking-at-if-then)
                   (f90-looking-at-where-or-forall)
                   (f90-looking-at-select-case))
               (setq icol (+ icol f90-if-indent)))
              ((f90-looking-at-associate)
               (setq icol (+ icol f90-associate-indent)))
              ((looking-at f90-end-if-re)
               (setq icol (- icol f90-if-indent)))
              ((looking-at f90-end-associate-re)
               (setq icol (- icol f90-associate-indent)))
              ((looking-at "end[ \t]*do\\>")
               (setq icol (- icol f90-do-indent))))
        (end-of-line))
      icol)))

(defun f90-calculate-indent ()
  "Calculate the indent column based on previous statements."
  (interactive)
  (let (icol cont (case-fold-search t) (pnt (point)))
    (save-excursion
      (if (not (f90-previous-statement))
          ;; If f90-previous-statement returns nil, we must have been
          ;; called from on or before the first line of the first statement.
          (setq icol (if (save-excursion
                           ;; f90-previous-statement has moved us over
                           ;; comment/blank lines, so we need to get
                           ;; back to the first code statement.
                           (when (looking-at "[ \t]*\\([!#]\\|$\\)")
                             (f90-next-statement))
                           (skip-chars-forward " \t0-9")
                           (f90-looking-at-program-block-start))
                         0
                       ;; No explicit PROGRAM start statement.
                       f90-program-indent))
        (setq cont (f90-present-statement-cont))
        (if (eq cont 'end)
            (while (not (eq 'begin (f90-present-statement-cont)))
              (f90-previous-statement)))
        (cond ((eq cont 'begin)
               (setq icol (+ (f90-current-indentation)
                             f90-continuation-indent)))
              ((eq cont 'middle) (setq icol (current-indentation)))
              (t (setq icol (f90-current-indentation))
                 (skip-chars-forward " \t")
                 (if (looking-at "[0-9]")
                     (setq icol (f90-get-correct-indent))
                   (cond ((or (f90-looking-at-if-then)
                              (f90-looking-at-where-or-forall)
                              (f90-looking-at-select-case)
                              (looking-at f90-else-like-re))
                          (setq icol (+ icol f90-if-indent)))
                         ((f90-looking-at-do)
                          (setq icol (+ icol f90-do-indent)))
                         ((f90-looking-at-type-like)
                          (setq icol (+ icol f90-type-indent)))
                         ((f90-looking-at-associate)
                          (setq icol (+ icol f90-associate-indent)))
                         ((or (f90-looking-at-program-block-start)
                              (looking-at "contains[ \t]*\\($\\|!\\)"))
                          (setq icol (+ icol f90-program-indent)))))
                 (goto-char pnt)
                 (beginning-of-line)
                 (cond ((looking-at "[ \t]*$"))
                       ((looking-at "[ \t]*#") ; check for cpp directive
                        (setq icol 0))
                       (t
                        (skip-chars-forward " \t0-9")
                        (cond ((or (looking-at f90-else-like-re)
                                   (looking-at f90-end-if-re))
                               (setq icol (- icol f90-if-indent)))
                              ((looking-at "end[ \t]*do\\>")
                               (setq icol (- icol f90-do-indent)))
                              ((looking-at f90-end-type-re)
                               (setq icol (- icol f90-type-indent)))
                              ((looking-at f90-end-associate-re)
                               (setq icol (- icol f90-associate-indent)))
                              ((or (looking-at "contains[ \t]*\\(!\\|$\\)")
                                   (f90-looking-at-program-block-end))
                               (setq icol (- icol f90-program-indent))))))
                 ))))
    icol))

(defun f90-previous-statement ()
  "Move point to beginning of the previous F90 statement.
If no previous statement is found (i.e. if called from the first
statement in the buffer), move to the start of the buffer and
return nil.  A statement is a line which is neither blank nor a
comment."
  (interactive)
  (let (not-first-statement)
    (beginning-of-line)
    (while (and (setq not-first-statement (zerop (forward-line -1)))
                (looking-at "[ \t0-9]*\\(!\\|$\\|#\\)")))
    not-first-statement))

(defun f90-next-statement ()
  "Move point to beginning of the next F90 statement.
Return nil if no later statement is found."
  (interactive)
  (let (not-last-statement)
    (beginning-of-line)
    (while (and (setq not-last-statement
                      (and (zerop (forward-line 1))
                           (not (eobp))))
                (looking-at "[ \t0-9]*\\(!\\|$\\)")))
    not-last-statement))

(defun f90-beginning-of-subprogram ()
  "Move point to the beginning of the current subprogram.
Return (TYPE NAME), or nil if not found."
  (interactive)
  (let ((count 1) (case-fold-search t) matching-beg)
    (beginning-of-line)
    (while (and (> count 0)
                (re-search-backward f90-program-block-re nil 'move))
      (beginning-of-line)
      (skip-chars-forward " \t0-9")
      (cond ((setq matching-beg (f90-looking-at-program-block-start))
             (setq count (1- count)))
            ((f90-looking-at-program-block-end)
             (setq count (1+ count)))))
    (beginning-of-line)
    (if (zerop count)
        matching-beg
      ;; Note this includes the case of an un-named main program,
      ;; in which case we go to (point-min).
      (message "No beginning found.")
      nil)))

(defun f90-end-of-subprogram ()
  "Move point to the end of the current subprogram.
Return (TYPE NAME), or nil if not found."
  (interactive)
  (let ((case-fold-search t)
        (count 1) 
        matching-end)
    (end-of-line)
    (while (and (> count 0)
                (re-search-forward f90-program-block-re nil 'move))
      (beginning-of-line)
      (skip-chars-forward " \t0-9")
      (cond ((f90-looking-at-program-block-start)
             (setq count (1+ count)))
            ((setq matching-end (f90-looking-at-program-block-end))
             (setq count (1- count))))
      (end-of-line))
    ;; This means f90-end-of-subprogram followed by f90-start-of-subprogram
    ;; has a net non-zero effect, which seems odd.
;;;    (forward-line 1)
    (if (zerop count)
        matching-end
      (message "No end found.")
      nil)))


(defun f90-end-of-block (&optional num)
  "Move point forward to the end of the current code block.
With optional argument NUM, go forward that many balanced blocks.
If NUM is negative, go backward to the start of a block.  Checks
for consistency of block types and labels (if present), and
completes outermost block if `f90-smart-end' is non-nil.
Interactively, pushes mark before moving point."
  (interactive "p")
  (if (interactive-p) (push-mark (point) t)) ; can move some distance
  (and num (< num 0) (f90-beginning-of-block (- num)))
  (let ((f90-smart-end (if f90-smart-end 'no-blink)) ; for final match-end
        (case-fold-search t)
        (count (or num 1))
        start-list start-this start-type start-label end-type end-label)
    (end-of-line)                       ; probably want this
    (while (and (> count 0) (re-search-forward f90-blocks-re nil 'move))
      (beginning-of-line)
      (skip-chars-forward " \t0-9")
      (cond ((or (f90-in-string) (f90-in-comment)))
            ((setq start-this
                   (or
                    (f90-looking-at-do)
                    (f90-looking-at-select-case)
                    (f90-looking-at-type-like)
                    (f90-looking-at-associate)
                    (f90-looking-at-program-block-start)
                    (f90-looking-at-if-then)
                    (f90-looking-at-where-or-forall)))
             (setq start-list (cons start-this start-list) ; not add-to-list!
                   count (1+ count)))
            ((looking-at (concat "end[ \t]*" f90-blocks-re
                                 "[ \t]*\\(\\sw+\\)?"))
             (setq end-type (match-string 1)
                   end-label (match-string 2)
                   count (1- count))
             ;; Check any internal blocks.
             (when start-list
               (setq start-this (car start-list)
                     start-list (cdr start-list)
                     start-type (car start-this)
                     start-label (cadr start-this))
               (or (f90-equal-symbols start-type end-type)
                   (error "End type `%s' does not match start type `%s'"
                          end-type start-type))
               (or (f90-equal-symbols start-label end-label)
                   (error "End label `%s' does not match start label `%s'"
                          end-label start-label)))))
      (end-of-line))
    (if (> count 0) (error "Missing block end"))
    ;; Check outermost block.
    (when f90-smart-end
      (save-excursion
        (beginning-of-line)
        (skip-chars-forward " \t0-9")
        (f90-match-end)))))

(defun f90-beginning-of-block (&optional num)
  "Move point backwards to the start of the current code block.
With optional argument NUM, go backward that many balanced blocks.
If NUM is negative, go forward to the end of a block.
Checks for consistency of block types and labels (if present).
Does not check the outermost block, because it may be incomplete.
Interactively, pushes mark before moving point."
  (interactive "p")
  (if (interactive-p) (push-mark (point) t))
  (and num (< num 0) (f90-end-of-block (- num)))
  (let ((case-fold-search t)
        (count (or num 1))
        end-list end-this end-type end-label
        start-this start-type start-label)
    (beginning-of-line)                 ; probably want this
    (while (and (> count 0) (re-search-backward f90-blocks-re nil 'move))
      (beginning-of-line)
      (skip-chars-forward " \t0-9")
      (cond ((or (f90-in-string) (f90-in-comment)))
            ((looking-at (concat "end[ \t]*" f90-blocks-re
                                 "[ \t]*\\(\\sw+\\)?"))
             (setq end-list (cons (list (match-string 1) (match-string 2))
                                  end-list)
                   count (1+ count)))
            ((setq start-this
                   (or
                    (f90-looking-at-do)
                    (f90-looking-at-select-case)
                    (f90-looking-at-type-like)
                    (f90-looking-at-associate)
                    (f90-looking-at-program-block-start)
                    (f90-looking-at-if-then)
                    (f90-looking-at-where-or-forall)))
             (setq start-type (car start-this)
                   start-label (cadr start-this)
                   count (1- count))
             ;; Check any internal blocks.
             (when end-list
               (setq end-this (car end-list)
                     end-list (cdr end-list)
                     end-type (car end-this)
                     end-label (cadr end-this))
               (or (f90-equal-symbols start-type end-type)
                   (error "Start type `%s' does not match end type `%s'"
                          start-type end-type))
               (or (f90-equal-symbols start-label end-label)
                   (error "Start label `%s' does not match end label `%s'"
                          start-label end-label))))))
    ;; Includes an un-named main program block.
    (if (> count 0) (error "Missing block start"))))

(defun f90-next-block (&optional num)
  "Move point forward to the next end or start of a code block.
With optional argument NUM, go forward that many blocks.
If NUM is negative, go backwards.
A block is a subroutine, if-endif, etc."
  (interactive "p")
  (let ((case-fold-search t)
        (count (if num (abs num) 1)))
    (while (and (> count 0)
                (if (> num 0) (re-search-forward f90-blocks-re nil 'move)
                  (re-search-backward f90-blocks-re nil 'move)))
      (beginning-of-line)
      (skip-chars-forward " \t0-9")
      (cond ((or (f90-in-string) (f90-in-comment)))
            ((or
              (looking-at "end[ \t]*")
              (f90-looking-at-do)
              (f90-looking-at-select-case)
              (f90-looking-at-type-like)
              (f90-looking-at-associate)
              (f90-looking-at-program-block-start)
              (f90-looking-at-if-then)
              (f90-looking-at-where-or-forall))
             (setq count (1- count))))
      (if (> num 0) (end-of-line)
        (beginning-of-line)))))


(defun f90-previous-block (&optional num)
  "Move point backward to the previous end or start of a code block.
With optional argument NUM, go backward that many blocks.
If NUM is negative, go forwards.
A block is a subroutine, if-endif, etc."
  (interactive "p")
  (f90-next-block (- (or num 1))))


(defun f90-mark-subprogram ()
  "Put mark at end of F90 subprogram, point at beginning, push mark."
  (interactive)
  (let ((pos (point)) program)
    (f90-end-of-subprogram)
    (push-mark)
    (goto-char pos)
    (setq program (f90-beginning-of-subprogram))
    (if (fboundp 'zmacs-activate-region)
        (zmacs-activate-region)
      (setq mark-active t
            deactivate-mark nil))
    program))

(defun f90-comment-region (beg-region end-region)
  "Comment/uncomment every line in the region.
Insert the variable `f90-comment-region' at the start of every line
in the region, or, if already present, remove it."
  (interactive "*r")
  (let ((end (copy-marker end-region)))
    (goto-char beg-region)
    (beginning-of-line)
    (if (looking-at (regexp-quote f90-comment-region))
        (delete-region (point) (match-end 0))
      (insert f90-comment-region))
    (while (and (zerop (forward-line 1))
                (< (point) end))
      (if (looking-at (regexp-quote f90-comment-region))
          (delete-region (point) (match-end 0))
        (insert f90-comment-region)))
    (set-marker end nil)))

(defun f90-indent-line (&optional no-update)
  "Indent current line as F90 code.
Unless optional argument NO-UPDATE is non-nil, call `f90-update-line'
after indenting."
  (interactive "*P")
  (let ((case-fold-search t)
        (pos (point-marker))
        indent no-line-number)
    (beginning-of-line)           ; digits after & \n are not line-nos
    (if (not (save-excursion (and (f90-previous-statement)
                                  (f90-line-continued))))
        (f90-indent-line-no)
      (setq no-line-number t)
      (skip-chars-forward " \t"))
    (if (looking-at "!")
        (setq indent (f90-comment-indent))
      (and f90-smart-end (looking-at "end")
           (f90-match-end))
      (setq indent (f90-calculate-indent)))
    (or (= indent (current-column))
        (f90-indent-to indent no-line-number))
    ;; If initial point was within line's indentation,
    ;; position after the indentation.  Else stay at same point in text.
    (and (< (point) pos)
         (goto-char pos))
    (if auto-fill-function
        ;; GM NO-UPDATE not honoured, since this calls f90-update-line.
        (f90-do-auto-fill)
      (or no-update (f90-update-line)))
    (set-marker pos nil)))

(defun f90-indent-new-line ()
  "Re-indent current line, insert a newline and indent the newline.
An abbrev before point is expanded if the variable `abbrev-mode' is non-nil.
If run in the middle of a line, the line is not broken."
  (interactive "*")
  (if abbrev-mode (expand-abbrev))
  (beginning-of-line)             ; reindent where likely to be needed
  (f90-indent-line)                ; calls indent-line-no, update-line
  (end-of-line)
  (delete-horizontal-space)             ; destroy trailing whitespace
  (let ((string (f90-in-string))
        (cont (f90-line-continued)))
    (and string (not cont) (insert "&"))
    (newline)
    (if (or string (and cont f90-beginning-ampersand)) (insert "&")))
  (f90-indent-line 'no-update))         ; nothing to update


;; TODO not add spaces to empty lines at the start.
;; Why is second line getting extra indent over first?
(defun f90-indent-region (beg-region end-region)
  "Indent every line in region by forward parsing."
  (interactive "*r")
  (let ((end-region-mark (copy-marker end-region))
        (save-point (point-marker))
        (case-fold-search t)
        block-list ind-lev ind-curr ind-b cont struct beg-struct end-struct)
    (goto-char beg-region)
    ;; First find a line which is not a continuation line or comment.
    (beginning-of-line)
    (while (and (looking-at "[ \t]*[0-9]*\\(!\\|#\\|[ \t]*$\\)")
                (progn (f90-indent-line 'no-update)
                       (zerop (forward-line 1)))
                (< (point) end-region-mark)))
    (setq cont (f90-present-statement-cont))
    (while (and (or (eq cont 'middle) (eq cont 'end))
                (f90-previous-statement))
      (setq cont (f90-present-statement-cont)))
    ;; Process present line for beginning of block.
    (setq f90-cache-position (point))
    (f90-indent-line 'no-update)
    (setq ind-lev (f90-current-indentation)
          ind-curr ind-lev)
    (beginning-of-line)
    (skip-chars-forward " \t0-9")
    (setq struct nil
          ind-b (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
                      ((or (setq struct (f90-looking-at-if-then))
                           (setq struct (f90-looking-at-select-case))
                           (setq struct (f90-looking-at-where-or-forall))
                           (looking-at f90-else-like-re))
                       f90-if-indent)
                      ((setq struct (f90-looking-at-type-like))
                       f90-type-indent)
                      ((setq struct (f90-looking-at-associate))
                       f90-associate-indent)
                      ((or (setq struct (f90-looking-at-program-block-start))
                           (looking-at "contains[ \t]*\\($\\|!\\)"))
                       f90-program-indent)))
    (if ind-b (setq ind-lev (+ ind-lev ind-b)))
    (if struct (setq block-list (cons struct block-list)))
    (while (and (f90-line-continued) (zerop (forward-line 1))
                (< (point) end-region-mark))
      (if (looking-at "[ \t]*!")
          (f90-indent-to (f90-comment-indent))
        (or (= (current-indentation)
               (+ ind-curr f90-continuation-indent))
            (f90-indent-to (+ ind-curr f90-continuation-indent) 'no-line-no))))
    ;; Process all following lines.
    (while (and (zerop (forward-line 1)) (< (point) end-region-mark))
      (beginning-of-line)
      (f90-indent-line-no)
      (setq f90-cache-position (point))
      (cond ((looking-at "[ \t]*$") (setq ind-curr 0))
            ((looking-at "[ \t]*#") (setq ind-curr 0))
            ((looking-at "!") (setq ind-curr (f90-comment-indent)))
            ((f90-no-block-limit) (setq ind-curr ind-lev))
            ((looking-at f90-else-like-re) (setq ind-curr
                                                 (- ind-lev f90-if-indent)))
            ((looking-at "contains[ \t]*\\($\\|!\\)")
             (setq ind-curr (- ind-lev f90-program-indent)))
            ((setq ind-b
                   (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
                         ((or (setq struct (f90-looking-at-if-then))
                              (setq struct (f90-looking-at-select-case))
                              (setq struct (f90-looking-at-where-or-forall)))
                          f90-if-indent)
                         ((setq struct (f90-looking-at-type-like))
                          f90-type-indent)
                         ((setq struct (f90-looking-at-associate))
                          f90-associate-indent)
                         ((setq struct (f90-looking-at-program-block-start))
                          f90-program-indent)))
             (setq ind-curr ind-lev)
             (if ind-b (setq ind-lev (+ ind-lev ind-b)))
             (setq block-list (cons struct block-list)))
            ((setq end-struct (f90-looking-at-program-block-end))
             (setq beg-struct (car block-list)
                   block-list (cdr block-list))
             (if f90-smart-end
                 (save-excursion
                   (f90-block-match (car beg-struct) (car (cdr beg-struct))
                                    (car end-struct) (car (cdr end-struct)))))
             (setq ind-b
                   (cond ((looking-at f90-end-if-re) f90-if-indent)
                         ((looking-at "end[ \t]*do\\>")  f90-do-indent)
                         ((looking-at f90-end-type-re) f90-type-indent)
                         ((looking-at f90-end-associate-re)
                          f90-associate-indent)
                         ((f90-looking-at-program-block-end)
                          f90-program-indent)))
             (if ind-b (setq ind-lev (- ind-lev ind-b)))
             (setq ind-curr ind-lev))
            (t (setq ind-curr ind-lev)))
      ;; Do the indentation if necessary.
      (or (= ind-curr (current-column))
          (f90-indent-to ind-curr))
      (while (and (f90-line-continued) (zerop (forward-line 1))
                  (< (point) end-region-mark))
        (if (looking-at "[ \t]*!")
            (f90-indent-to (f90-comment-indent))
          (or (= (current-indentation)
                 (+ ind-curr f90-continuation-indent))
              (f90-indent-to
               (+ ind-curr f90-continuation-indent) 'no-line-no)))))
    ;; Restore point, etc.
    (setq f90-cache-position nil)
    (goto-char save-point)
    (set-marker end-region-mark nil)
    (set-marker save-point nil)
    (if (fboundp 'zmacs-deactivate-region)
        (zmacs-deactivate-region)
      (deactivate-mark))))

(defun f90-indent-subprogram ()
  "Properly indent the subprogram containing point."
  (interactive "*")
  (save-excursion
    (let ((program (f90-mark-subprogram)))
      (if program
          (progn
            (message "Indenting %s %s..."
                     (car program) (car (cdr program)))
            (indent-region (point) (mark) nil)
            (message "Indenting %s %s...done"
                     (car program) (car (cdr program))))
        (message "Indenting the whole file...")
        (indent-region (point) (mark) nil)
        (message "Indenting the whole file...done")))))

(defun f90-break-line (&optional no-update)
  "Break line at point, insert continuation marker(s) and indent.
Unless in a string or comment, or if the optional argument NO-UPDATE
is non-nil, call `f90-update-line' after inserting the continuation marker."
  (interactive "*P")
  (cond ((f90-in-string)
         (insert "&\n&"))
        ((f90-in-comment)
         (delete-horizontal-space 'backwards) ; remove trailing whitespace
         (insert "\n" (f90-get-present-comment-type)))
        (t (insert "&")
           (or no-update (f90-update-line))
           (newline 1)
           (if f90-beginning-ampersand (insert "&"))))
  (indent-according-to-mode))

(defun f90-find-breakpoint ()
  "From `fill-column', search backward for break-delimiter."
  (re-search-backward f90-break-delimiters (line-beginning-position))
  (if (not f90-break-before-delimiters)
      (forward-char (if (looking-at f90-no-break-re) 2 1))
    (backward-char)
    (or (looking-at f90-no-break-re)
        (forward-char))))

(defun f90-do-auto-fill ()
  "Break line if non-white characters beyond `fill-column'.
Update keyword case first."
  (interactive "*")
  ;; Break line before or after last delimiter (non-word char) if
  ;; position is beyond fill-column.
  ;; Will not break **, //, or => (as specified by f90-no-break-re).
  (f90-update-line)
  ;; Need this for `f90-electric-insert' and other f90- callers.
  (unless (and (boundp 'comment-auto-fill-only-comments)
               comment-auto-fill-only-comments
               (not (f90-in-comment)))
    (while (> (current-column) fill-column)
      (let ((pos-mark (point-marker)))
        (move-to-column fill-column)
        (or (f90-in-string) (f90-find-breakpoint))
        (f90-break-line)
        (goto-char pos-mark)
        (set-marker pos-mark nil)))))

(defun f90-join-lines (&optional arg)
  "Join current line to previous, fix whitespace, continuation, comments.
With optional argument ARG, join current line to following line.
Like `join-line', but handles F90 syntax."
  (interactive "*P")
  (beginning-of-line)
  (if arg (forward-line 1))
  (when (eq (preceding-char) ?\n)
    (skip-chars-forward " \t")
    (if (looking-at "\&") (delete-char 1))
    (beginning-of-line)
    (delete-region (point) (1- (point)))
    (skip-chars-backward " \t")
    (and (eq (preceding-char) ?&) (delete-char -1))
    (and (f90-in-comment)
         (looking-at "[ \t]*!+")
         (replace-match ""))
    (or (f90-in-string)
        (fixup-whitespace))))

(defun f90-fill-region (beg-region end-region)
  "Fill every line in region by forward parsing.  Join lines if possible."
  (interactive "*r")
  (let ((end-region-mark (copy-marker end-region))
        (go-on t)
        f90-smart-end f90-auto-keyword-case auto-fill-function)
    (goto-char beg-region)
    (while go-on
      ;; Join as much as possible.
      (while (progn
               (end-of-line)
               (skip-chars-backward " \t")
               (eq (preceding-char) ?&))
        (f90-join-lines 'forward))
      ;; Chop the line if necessary.
      (while (> (save-excursion (end-of-line) (current-column))
                fill-column)
        (move-to-column fill-column)
        (f90-find-breakpoint)
        (f90-break-line 'no-update))
      (setq go-on (and (< (point) end-region-mark)
                       (zerop (forward-line 1)))
            f90-cache-position (point)))
    (setq f90-cache-position nil)
    (set-marker end-region-mark nil)
    (if (fboundp 'zmacs-deactivate-region)
        (zmacs-deactivate-region)
      (deactivate-mark))))

(defun f90-block-match (beg-block beg-name end-block end-name)
  "Match end-struct with beg-struct and complete end-block if possible.
BEG-BLOCK is the type of block as indicated at the start (e.g., do).
BEG-NAME is the block start name (may be nil).
END-BLOCK is the type of block as indicated at the end (may be nil).
END-NAME is the block end name (may be nil).
Leave point at the end of line."
  ;; Hack to deal with the case when this is called from
  ;; f90-indent-region on a program block without an explicit PROGRAM
  ;; statement at the start. Should really be an error (?).
  (or beg-block (setq beg-block "program"))
  (search-forward "end" (line-end-position))
  (catch 'no-match
    (if (and end-block (f90-equal-symbols beg-block end-block))
        (search-forward end-block)
      (if end-block
          (progn
            (message "END %s does not match %s." end-block beg-block)
            (end-of-line)
            (throw 'no-match nil))
        (message "Inserting %s." beg-block)
        (insert (concat " " beg-block))))
    (if (f90-equal-symbols beg-name end-name)
        (and end-name (search-forward end-name))
      (cond ((and beg-name (not end-name))
             (message "Inserting %s." beg-name)
             (insert (concat " " beg-name)))
            ((and beg-name end-name)
             (message "Replacing %s with %s." end-name beg-name)
             (search-forward end-name)
             (replace-match beg-name))
            ((and (not beg-name) end-name)
             (message "Deleting %s." end-name)
             (search-forward end-name)
             (replace-match ""))))
    (or (looking-at "[ \t]*!") (delete-horizontal-space))))

(defun f90-match-end ()
  "From an end block statement, find the corresponding block and name."
  (interactive)
  (let ((count 1)
        (top-of-window (window-start))
        (end-point (point))
        (case-fold-search t)
        matching-beg beg-name end-name beg-block end-block end-struct)
    (when (save-excursion (beginning-of-line) (skip-chars-forward " \t0-9")
                          (setq end-struct (f90-looking-at-program-block-end)))
      (setq end-block (car end-struct)
            end-name  (car (cdr end-struct)))
      (save-excursion
        (beginning-of-line)
        (while (and (> count 0)
                    (not (= (line-beginning-position) (point-min))))
          (re-search-backward f90-blocks-re nil 'move)
          (beginning-of-line)
          ;; GM not a line number if continued line.
;;;          (skip-chars-forward " \t")
;;;          (skip-chars-forward "0-9")
          (skip-chars-forward " \t0-9")
          (cond ((or (f90-in-string) (f90-in-comment)))
                ((setq matching-beg
                       (or
                        (f90-looking-at-do)
                        (f90-looking-at-if-then)
                        (f90-looking-at-where-or-forall)
                        (f90-looking-at-select-case)
                        (f90-looking-at-type-like)
                        (f90-looking-at-associate)
                        (f90-looking-at-program-block-start)
                        ;; Interpret a single END without a block
                        ;; start to be the END of a program block
                        ;; without an initial PROGRAM line.
                        (if (= (line-beginning-position) (point-min))
                            '("program" nil))))
                 (setq count (1- count)))
                ((looking-at (concat "end[ \t]*" f90-blocks-re))
                 (setq count (1+ count)))))
        (if (> count 0)
            (message "No matching beginning.")
          (f90-update-line)
          (if (eq f90-smart-end 'blink)
              (if (< (point) top-of-window)
                  (message "Matches %s: %s"
                           (what-line)
                           (buffer-substring
                            (line-beginning-position)
                            (line-end-position)))
                (sit-for blink-matching-delay)))
          (setq beg-block (car matching-beg)
                beg-name (car (cdr matching-beg)))
          (goto-char end-point)
          (beginning-of-line)
          (f90-block-match beg-block beg-name end-block end-name))))))

(defun f90-insert-end ()
  "Insert a complete end statement matching beginning of present block."
  (interactive "*")
  (let ((f90-smart-end (or f90-smart-end 'blink)))
    (insert "end")
    (f90-indent-new-line)))

;; Abbrevs and keywords.

(defun f90-abbrev-start ()
  "Typing `\\[help-command] or `? lists all the F90 abbrevs.
Any other key combination is executed normally."
  (interactive "*")
  (insert last-command-char)
  (let (char event)
    (if (fboundp 'next-command-event) ; XEmacs
        (setq event (next-command-event)
              char (and (fboundp 'event-to-character)
                        (event-to-character event)))
      (setq event (read-event)
            char event))
    ;; Insert char if not equal to `?', or if abbrev-mode is off.
    (if (and abbrev-mode (or (eq char ??) (eq char help-char)))
        (f90-abbrev-help)
      (setq unread-command-events (list event)))))

(defun f90-abbrev-help ()
  "List the currently defined abbrevs in F90 mode."
  (interactive)
  (message "Listing abbrev table...")
  (display-buffer (f90-prepare-abbrev-list-buffer))
  (message "Listing abbrev table...done"))

(defun f90-prepare-abbrev-list-buffer ()
  "Create a buffer listing the F90 mode abbreviations."
  (save-excursion
    (set-buffer (get-buffer-create "*Abbrevs*"))
    (erase-buffer)
    (insert-abbrev-table-description 'f90-mode-abbrev-table t)
    (goto-char (point-min))
    (set-buffer-modified-p nil)
    (edit-abbrevs-mode))
  (get-buffer-create "*Abbrevs*"))

(defun f90-upcase-keywords ()
  "Upcase all F90 keywords in the buffer."
  (interactive "*")
  (f90-change-keywords 'upcase-word))

(defun f90-capitalize-keywords ()
  "Capitalize all F90 keywords in the buffer."
  (interactive "*")
  (f90-change-keywords 'capitalize-word))

(defun f90-downcase-keywords ()
  "Downcase all F90 keywords in the buffer."
  (interactive "*")
  (f90-change-keywords 'downcase-word))

(defun f90-upcase-region-keywords (beg end)
  "Upcase all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'upcase-word beg end))

(defun f90-capitalize-region-keywords (beg end)
  "Capitalize all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'capitalize-word beg end))

(defun f90-downcase-region-keywords (beg end)
  "Downcase all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'downcase-word beg end))

;; Change the keywords according to argument.
(defun f90-change-keywords (change-word &optional beg end)
  "Change the case of F90 keywords in the region (if specified) or buffer.
CHANGE-WORD should be one of 'upcase-word, 'downcase-word, 'capitalize-word."
  (save-excursion
    (setq beg (or beg (point-min))
          end (or end (point-max)))
    (let ((keyword-re
           (concat "\\("
                   f90-keywords-re "\\|" f90-procedures-re "\\|"
                   f90-hpf-keywords-re "\\|" f90-operators-re "\\)"))
          (ref-point (point-min))
          (modified (buffer-modified-p))
          state saveword back-point)
      (goto-char beg)
      (unwind-protect
          (while (re-search-forward keyword-re end t)
            (unless (progn
                      (setq state (parse-partial-sexp ref-point (point)))
                      (or (nth 3 state) (nth 4 state)
                          ;; GM f90-directive-comment-re?
                          (save-excursion ; check for cpp directive
                            (beginning-of-line)
                            (skip-chars-forward " \t0-9")
                            (looking-at "#"))))
              (setq ref-point (point)
                    back-point (save-excursion (backward-word 1) (point))
                    saveword (buffer-substring back-point ref-point))
              (funcall change-word -1)
              (or (string= saveword (buffer-substring back-point ref-point))
                  (setq modified t))))
        (or modified (set-buffer-modified-p nil))))))


(defun f90-current-defun ()
  "Function to use for `add-log-current-defun-function' in F90 mode."
  (save-excursion
    (nth 1 (f90-beginning-of-subprogram))))


(defun f90-backslash-not-special (&optional all)
  "Make the backslash character (\\) be non-special in the current buffer.
With optional argument ALL, change the default for all present
and future F90 buffers.  F90 mode normally treats backslash as an
escape character."
  (or (eq major-mode 'f90-mode)
      (error "This function should only be used in F90 buffers"))
  (when (equal (char-syntax ?\\ ) ?\\ )
    (or all (set-syntax-table (copy-syntax-table (syntax-table))))
    (modify-syntax-entry ?\\ ".")))


(provide 'f90)

;;; arch-tag: fceac97c-c147-44bd-aec0-172d4b560ef8
;;; f90.el ends here