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
| | ;;; newcomment.el --- (un)comment regions of buffers -*- lexical-binding: t -*-
;; Copyright (C) 1999-2012 Free Software Foundation, Inc.
;; Author: code extracted from Emacs-20's simple.el
;; Maintainer: Stefan Monnier <monnier@iro.umontreal.ca>
;; Keywords: comment uncomment
;; Package: emacs
;; 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 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; A replacement for simple.el's comment-related functions.
;;; Bugs:
;; - boxed comments in Perl are not properly uncommented because they are
;; uncommented one-line at a time.
;; - nested comments in sgml-mode are not properly quoted.
;; - single-char nestable comment-start can only do the "\\s<+" stuff
;; if the corresponding closing marker happens to be right.
;; - uncomment-region with a numeric argument can render multichar
;; comment markers invalid.
;; - comment-indent or comment-region when called inside a comment
;; will happily break the surrounding comment.
;; - comment-quote-nested will not (un)quote properly all nested comment
;; markers if there are more than just comment-start and comment-end.
;; For example, in Pascal where {...*) and (*...} are possible.
;;; Todo:
;; - rebox.el-style refill.
;; - quantized steps in comment-alignment.
;; - try to align tail comments.
;; - check what c-comment-line-break-function has to say.
;; - spill auto-fill of comments onto the end of the next line.
;; - uncomment-region with a consp (for blocks) or somehow make the
;; deletion of continuation markers less dangerous.
;; - drop block-comment-<foo> unless it's really used.
;; - uncomment-region on a subpart of a comment.
;; - support gnu-style "multi-line with space in continue".
;; - somehow allow comment-dwim to use the region even if transient-mark-mode
;; is not turned on.
;; - when auto-filling a comment, try to move the comment to the left
;; rather than break it (if possible).
;; - sometimes default the comment-column to the same
;; one used on the preceding line(s).
;;; Code:
;;;###autoload
(defalias 'indent-for-comment 'comment-indent)
;;;###autoload
(defalias 'set-comment-column 'comment-set-column)
;;;###autoload
(defalias 'kill-comment 'comment-kill)
;;;###autoload
(defalias 'indent-new-comment-line 'comment-indent-new-line)
(defgroup comment nil
"Indenting and filling of comments."
:prefix "comment-"
:version "21.1"
:group 'fill)
;; Autoload this to avoid warnings, since some major modes define it.
;;;###autoload
(defvar comment-use-syntax 'undecided
"Non-nil if syntax-tables can be used instead of regexps.
Can also be `undecided' which means that a somewhat expensive test will
be used to try to determine whether syntax-tables should be trusted
to understand comments or not in the given buffer.
Major modes should set this variable.")
(defcustom comment-fill-column nil
"Column to use for `comment-indent'. If nil, use `fill-column' instead."
:type '(choice (const nil) integer)
:group 'comment)
;;;###autoload
(defcustom comment-column 32
"Column to indent right-margin comments to.
Each mode may establish a different default value for this variable; you
can set the value for a particular mode using that mode's hook.
Comments might be indented to a different value in order not to go beyond
`comment-fill-column' or in order to align them with surrounding comments."
:type 'integer
:group 'comment)
(make-variable-buffer-local 'comment-column)
;;;###autoload(put 'comment-column 'safe-local-variable 'integerp)
;;;###autoload
(defvar comment-start nil
"*String to insert to start a new comment, or nil if no comment syntax.")
;;;###autoload(put 'comment-start 'safe-local-variable 'string-or-null-p)
;;;###autoload
(defvar comment-start-skip nil
"*Regexp to match the start of a comment plus everything up to its body.
If there are any \\(...\\) pairs, the comment delimiter text is held to begin
at the place matched by the close of the first pair.")
;;;###autoload(put 'comment-start-skip 'safe-local-variable 'string-or-null-p)
;;;###autoload
(defvar comment-end-skip nil
"Regexp to match the end of a comment plus everything back to its body.")
;;;###autoload(put 'comment-end-skip 'safe-local-variable 'string-or-null-p)
;;;###autoload
(defvar comment-end (purecopy "")
"*String to insert to end a new comment.
Should be an empty string if comments are terminated by end-of-line.")
;;;###autoload(put 'comment-end 'safe-local-variable 'string-or-null-p)
;;;###autoload
(defvar comment-indent-function 'comment-indent-default
"Function to compute desired indentation for a comment.
This function is called with no args with point at the beginning of
the comment's starting delimiter and should return either the desired
column indentation or nil.
If nil is returned, indentation is delegated to `indent-according-to-mode'.")
;;;###autoload
(defvar comment-insert-comment-function nil
"Function to insert a comment when a line doesn't contain one.
The function has no args.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
(defvar comment-region-function 'comment-region-default
"Function to comment a region.
Its args are the same as those of `comment-region', but BEG and END are
guaranteed to be correctly ordered. It is called within `save-excursion'.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
(defvar uncomment-region-function 'uncomment-region-default
"Function to uncomment a region.
Its args are the same as those of `uncomment-region', but BEG and END are
guaranteed to be correctly ordered. It is called within `save-excursion'.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
;; ?? never set
(defvar block-comment-start nil)
(defvar block-comment-end nil)
(defvar comment-quote-nested t
"Non-nil if nested comments should be quoted.
This should be locally set by each major mode if needed.")
(defvar comment-continue nil
"Continuation string to insert for multiline comments.
This string will be added at the beginning of each line except the very
first one when commenting a region with a commenting style that allows
comments to span several lines.
It should generally have the same length as `comment-start' in order to
preserve indentation.
If it is nil a value will be automatically derived from `comment-start'
by replacing its first character with a space.")
(defvar comment-add 0
"How many more comment chars should be inserted by `comment-region'.
This determines the default value of the numeric argument of `comment-region'.
The `plain' comment style doubles this value.
This should generally stay 0, except for a few modes like Lisp where
it is 1 so that regions are commented with two or three semi-colons.")
;;;###autoload
(defconst comment-styles
'((plain nil nil nil nil
"Start in column 0 (do not indent), as in Emacs-20")
(indent-or-triple nil nil nil multi-char
"Start in column 0, but only for single-char starters")
(indent nil nil nil t
"Full comment per line, ends not aligned")
(aligned nil t nil t
"Full comment per line, ends aligned")
(box nil t t t
"Full comment per line, ends aligned, + top and bottom")
(extra-line t nil t t
"One comment for all lines, end on a line by itself")
(multi-line t nil nil t
"One comment for all lines, end on last commented line")
(box-multi t t t t
"One comment for all lines, + top and bottom"))
"Comment region style definitions.
Each style is defined with a form (STYLE . (MULTI ALIGN EXTRA INDENT DOC)).
DOC should succinctly describe the style.
STYLE should be a mnemonic symbol.
MULTI specifies that comments are allowed to span multiple lines.
e.g. in C it comments regions as
/* blabla
* bli */
rather than
/* blabla */
/* bli */
if `comment-end' is empty, this has no effect.
ALIGN specifies that the `comment-end' markers should be aligned.
e.g. in C it comments regions as
/* blabla */
/* bli */
rather than
/* blabla */
/* bli */
if `comment-end' is empty, this has no effect, unless EXTRA is also set,
in which case the comment gets wrapped in a box.
EXTRA specifies that an extra line should be used before and after the
region to comment (to put the `comment-end' and `comment-start').
e.g. in C it comments regions as
/*
* blabla
* bli
*/
rather than
/* blabla
* bli */
if the comment style is not multi line, this has no effect, unless ALIGN
is also set, in which case the comment gets wrapped in a box.
INDENT specifies that the `comment-start' markers should not be put at the
left margin but at the current indentation of the region to comment.
If INDENT is `multi-char', that means indent multi-character
comment starters, but not one-character comment starters.")
;;;###autoload
(defcustom comment-style 'indent
"Style to be used for `comment-region'.
See `comment-styles' for a list of available styles."
:type (if (boundp 'comment-styles)
`(choice
,@(mapcar (lambda (s)
`(const :tag ,(format "%s: %s" (car s) (nth 5 s))
,(car s)))
comment-styles))
'symbol)
:version "23.1"
:group 'comment)
;;;###autoload
(defcustom comment-padding (purecopy " ")
"Padding string that `comment-region' puts between comment chars and text.
Can also be an integer which will be automatically turned into a string
of the corresponding number of spaces.
Extra spacing between the comment characters and the comment text
makes the comment easier to read. Default is 1. nil means 0."
:type '(choice string integer (const nil))
:group 'comment)
;;;###autoload
(defcustom comment-multi-line nil
"Non-nil means `comment-indent-new-line' continues comments.
That is, it inserts no new terminator or starter.
This affects `auto-fill-mode', which is the main reason to
customize this variable.
It also affects \\[indent-new-comment-line]. However, if you want this
behavior for explicit filling, you might as well use \\[newline-and-indent]."
:type 'boolean
:group 'comment)
(defcustom comment-empty-lines nil
"If nil, `comment-region' does not comment out empty lines.
If t, it always comments out empty lines.
If `eol' it only comments out empty lines if comments are
terminated by the end of line (i.e. `comment-end' is empty)."
:type '(choice (const :tag "Never" nil)
(const :tag "Always" t)
(const :tag "EOl-terminated" 'eol))
:group 'comment)
;;;;
;;;; Helpers
;;;;
(defun comment-string-strip (str beforep afterp)
"Strip STR of any leading (if BEFOREP) and/or trailing (if AFTERP) space."
(string-match (concat "\\`" (if beforep "\\s-*")
"\\(.*?\\)" (if afterp "\\s-*\n?")
"\\'") str)
(match-string 1 str))
(defun comment-string-reverse (s)
"Return the mirror image of string S, without any trailing space."
(comment-string-strip (concat (nreverse (string-to-list s))) nil t))
;;;###autoload
(defun comment-normalize-vars (&optional noerror)
"Check and setup the variables needed by other commenting functions.
Functions autoloaded from newcomment.el, being entry points, should call
this function before any other, so the rest of the code can assume that
the variables are properly set."
(unless (and (not comment-start) noerror)
(unless comment-start
(let ((cs (read-string "No comment syntax is defined. Use: ")))
(if (zerop (length cs))
(error "No comment syntax defined")
(set (make-local-variable 'comment-start) cs)
(set (make-local-variable 'comment-start-skip) cs))))
;; comment-use-syntax
(when (eq comment-use-syntax 'undecided)
(set (make-local-variable 'comment-use-syntax)
(let ((st (syntax-table))
(cs comment-start)
(ce (if (string= "" comment-end) "\n" comment-end)))
;; Try to skip over a comment using forward-comment
;; to see if the syntax tables properly recognize it.
(with-temp-buffer
(set-syntax-table st)
(insert cs " hello " ce)
(goto-char (point-min))
(and (forward-comment 1) (eobp))))))
;; comment-padding
(unless comment-padding (setq comment-padding 0))
(when (integerp comment-padding)
(setq comment-padding (make-string comment-padding ? )))
;; comment markers
;;(setq comment-start (comment-string-strip comment-start t nil))
;;(setq comment-end (comment-string-strip comment-end nil t))
;; comment-continue
(unless (or comment-continue (string= comment-end ""))
(set (make-local-variable 'comment-continue)
(concat (if (string-match "\\S-\\S-" comment-start) " " "|")
(substring comment-start 1)))
;; Hasn't been necessary yet.
;; (unless (string-match comment-start-skip comment-continue)
;; (kill-local-variable 'comment-continue))
)
;; comment-skip regexps
(unless (and comment-start-skip
;; In case comment-start has changed since last time.
(string-match comment-start-skip comment-start))
(set (make-local-variable 'comment-start-skip)
(concat "\\(\\(^\\|[^\\\n]\\)\\(\\\\\\\\\\)*\\)\\(\\s<+\\|"
(regexp-quote (comment-string-strip comment-start t t))
;; Let's not allow any \s- but only [ \t] since \n
;; might be both a comment-end marker and \s-.
"+\\)[ \t]*")))
(unless (and comment-end-skip
;; In case comment-end has changed since last time.
(string-match comment-end-skip
(if (string= "" comment-end) "\n" comment-end)))
(let ((ce (if (string= "" comment-end) "\n"
(comment-string-strip comment-end t t))))
(set (make-local-variable 'comment-end-skip)
;; We use [ \t] rather than \s- because we don't want to
;; remove ^L in C mode when uncommenting.
(concat "[ \t]*\\(\\s>" (if comment-quote-nested "" "+")
"\\|" (regexp-quote (substring ce 0 1))
(if (and comment-quote-nested (<= (length ce) 1)) "" "+")
(regexp-quote (substring ce 1))
"\\)"))))))
(defun comment-quote-re (str unp)
(concat (regexp-quote (substring str 0 1))
"\\\\" (if unp "+" "*")
(regexp-quote (substring str 1))))
(defun comment-quote-nested (cs ce unp)
"Quote or unquote nested comments.
If UNP is non-nil, unquote nested comment markers."
(setq cs (comment-string-strip cs t t))
(setq ce (comment-string-strip ce t t))
(when (and comment-quote-nested (> (length ce) 0))
(let ((re (concat (comment-quote-re ce unp)
"\\|" (comment-quote-re cs unp))))
(goto-char (point-min))
(while (re-search-forward re nil t)
(goto-char (match-beginning 0))
(forward-char 1)
(if unp (delete-char 1) (insert "\\"))
(when (= (length ce) 1)
;; If the comment-end is a single char, adding a \ after that
;; "first" char won't deactivate it, so we turn such a CE
;; into !CS. I.e. for pascal, we turn } into !{
(if (not unp)
(when (string= (match-string 0) ce)
(replace-match (concat "!" cs) t t))
(when (and (< (point-min) (match-beginning 0))
(string= (buffer-substring (1- (match-beginning 0))
(1- (match-end 0)))
(concat "!" cs)))
(backward-char 2)
(delete-char (- (match-end 0) (match-beginning 0)))
(insert ce))))))))
;;;;
;;;; Navigation
;;;;
(defvar comment-use-global-state nil
"Non-nil means that the global syntactic context is used.
More specifically, it means that `syntax-ppss' is used to find out whether
point is within a string or not. Major modes whose syntax is faithfully
described by the syntax-tables can set this to non-nil so comment markers
in strings will not confuse Emacs.")
(defun comment-search-forward (limit &optional noerror)
"Find a comment start between point and LIMIT.
Moves point to inside the comment and returns the position of the
comment-starter. If no comment is found, moves point to LIMIT
and raises an error or returns nil if NOERROR is non-nil."
(if (not comment-use-syntax)
(if (re-search-forward comment-start-skip limit noerror)
(or (match-end 1) (match-beginning 0))
(goto-char limit)
(unless noerror (error "No comment")))
(let* ((pt (point))
;; Assume (at first) that pt is outside of any string.
(s (parse-partial-sexp pt (or limit (point-max)) nil nil
(if comment-use-global-state (syntax-ppss pt))
t)))
(when (and (nth 8 s) (nth 3 s) (not comment-use-global-state))
;; The search ended at eol inside a string. Try to see if it
;; works better when we assume that pt is inside a string.
(setq s (parse-partial-sexp
pt (or limit (point-max)) nil nil
(list nil nil nil (nth 3 s) nil nil nil nil)
t)))
(if (or (not (and (nth 8 s) (not (nth 3 s))))
;; Make sure the comment starts after PT.
(< (nth 8 s) pt))
(unless noerror (error "No comment"))
;; We found the comment.
(let ((pos (point))
(start (nth 8 s))
(bol (line-beginning-position))
(end nil))
(while (and (null end) (>= (point) bol))
(if (looking-at comment-start-skip)
(setq end (min (or limit (point-max)) (match-end 0)))
(backward-char)))
(goto-char (or end pos))
start)))))
(defun comment-search-backward (&optional limit noerror)
"Find a comment start between LIMIT and point.
Moves point to inside the comment and returns the position of the
comment-starter. If no comment is found, moves point to LIMIT
and raises an error or returns nil if NOERROR is non-nil."
;; FIXME: If a comment-start appears inside a comment, we may erroneously
;; stop there. This can be rather bad in general, but since
;; comment-search-backward is only used to find the comment-column (in
;; comment-set-column) and to find the comment-start string (via
;; comment-beginning) in indent-new-comment-line, it should be harmless.
(if (not (re-search-backward comment-start-skip limit t))
(unless noerror (error "No comment"))
(beginning-of-line)
(let* ((end (match-end 0))
(cs (comment-search-forward end t))
(pt (point)))
(if (not cs)
(progn (beginning-of-line)
(comment-search-backward limit noerror))
(while (progn (goto-char cs)
(comment-forward)
(and (< (point) end)
(setq cs (comment-search-forward end t))))
(setq pt (point)))
(goto-char pt)
cs))))
(defun comment-beginning ()
"Find the beginning of the enclosing comment.
Returns nil if not inside a comment, else moves point and returns
the same as `comment-search-backward'."
;; HACK ATTACK!
;; We should really test `in-string-p' but that can be expensive.
(unless (eq (get-text-property (point) 'face) 'font-lock-string-face)
(let ((pt (point))
(cs (comment-search-backward nil t)))
(when cs
(if (save-excursion
(goto-char cs)
(and
;; For modes where comment-start and comment-end are the same,
;; the search above may have found a `ce' rather than a `cs'.
(or (if comment-end-skip (not (looking-at comment-end-skip)))
;; Maybe font-lock knows that it's a `cs'?
(eq (get-text-property (match-end 0) 'face)
'font-lock-comment-face)
(unless (eq (get-text-property (point) 'face)
'font-lock-comment-face)
;; Let's assume it's a `cs' if we're on the same line.
(>= (line-end-position) pt)))
;; Make sure that PT is not past the end of the comment.
(if (comment-forward 1) (> (point) pt) (eobp))))
cs
(goto-char pt)
nil)))))
(defun comment-forward (&optional n)
"Skip forward over N comments.
Just like `forward-comment' but only for positive N
and can use regexps instead of syntax."
(setq n (or n 1))
(if (< n 0) (error "No comment-backward")
(if comment-use-syntax (forward-comment n)
(while (> n 0)
(setq n
(if (or (forward-comment 1)
(and (looking-at comment-start-skip)
(goto-char (match-end 0))
(re-search-forward comment-end-skip nil 'move)))
(1- n) -1)))
(= n 0))))
(defun comment-enter-backward ()
"Move from the end of a comment to the end of its content.
Point is assumed to be just at the end of a comment."
(if (bolp)
;; comment-end = ""
(progn (backward-char) (skip-syntax-backward " "))
(cond
((save-excursion
(save-restriction
(narrow-to-region (line-beginning-position) (point))
(goto-char (point-min))
(re-search-forward (concat comment-end-skip "\\'") nil t)))
(goto-char (match-beginning 0)))
;; comment-end-skip not found probably because it was not set
;; right. Since \\s> should catch the single-char case, let's
;; check that we're looking at a two-char comment ender.
((not (or (<= (- (point-max) (line-beginning-position)) 1)
(zerop (logand (car (syntax-after (- (point) 1)))
;; Here we take advantage of the fact that
;; the syntax class " " is encoded to 0,
;; so " 4" gives us just the 4 bit.
(car (string-to-syntax " 4"))))
(zerop (logand (car (syntax-after (- (point) 2)))
(car (string-to-syntax " 3"))))))
(backward-char 2)
(skip-chars-backward (string (char-after)))
(skip-syntax-backward " "))
;; No clue what's going on: maybe we're really not right after the
;; end of a comment. Maybe we're at the "end" because of EOB rather
;; than because of a marker.
(t (skip-syntax-backward " ")))))
;;;;
;;;; Commands
;;;;
;;;###autoload
(defun comment-indent-default ()
"Default for `comment-indent-function'."
(if (and (looking-at "\\s<\\s<\\(\\s<\\)?")
(or (match-end 1) (/= (current-column) (current-indentation))))
0
(when (or (/= (current-column) (current-indentation))
(and (> comment-add 0) (looking-at "\\s<\\(\\S<\\|\\'\\)")))
comment-column)))
(defun comment-choose-indent (&optional indent)
"Choose the indentation to use for a right-hand-side comment.
The criteria are (in this order):
- try to keep the comment's text within `comment-fill-column'.
- try to align with surrounding comments.
- prefer INDENT (or `comment-column' if nil).
Point is expected to be at the start of the comment."
(unless indent (setq indent comment-column))
;; Avoid moving comments past the fill-column.
(let ((max (+ (current-column)
(- (or comment-fill-column fill-column)
(save-excursion (end-of-line) (current-column)))))
(other nil)
(min (save-excursion (skip-chars-backward " \t")
(1+ (current-column)))))
;; Fix up the range.
(if (< max min) (setq max min))
;; Don't move past the fill column.
(if (<= max indent) (setq indent max))
;; We can choose anywhere between min..max.
;; Let's try to align to a comment on the previous line.
(save-excursion
(when (and (zerop (forward-line -1))
(setq other (comment-search-forward
(line-end-position) t)))
(goto-char other) (setq other (current-column))))
(if (and other (<= other max) (>= other min))
;; There is a comment and it's in the range: bingo!
other
;; Can't align to a previous comment: let's try to align to comments
;; on the following lines, then. These have not been re-indented yet,
;; so we can't directly align ourselves with them. All we do is to try
;; and choose an indentation point with which they will be able to
;; align themselves.
(save-excursion
(while (and (zerop (forward-line 1))
(setq other (comment-search-forward
(line-end-position) t)))
(goto-char other)
(let ((omax (+ (current-column)
(- (or comment-fill-column fill-column)
(save-excursion (end-of-line) (current-column)))))
(omin (save-excursion (skip-chars-backward " \t")
(1+ (current-column)))))
(if (and (>= omax min) (<= omin max))
(progn (setq min (max omin min))
(setq max (min omax max)))
;; Can't align with this anyway, so exit the loop.
(goto-char (point-max))))))
;; Return the closest point to indent within min..max.
(max min (min max indent)))))
;;;###autoload
(defun comment-indent (&optional continue)
"Indent this line's comment to `comment-column', or insert an empty comment.
If CONTINUE is non-nil, use the `comment-continue' markers if any."
(interactive "*")
(comment-normalize-vars)
(let* ((empty (save-excursion (beginning-of-line)
(looking-at "[ \t]*$")))
(starter (or (and continue comment-continue)
(and empty block-comment-start) comment-start))
(ender (or (and continue comment-continue "")
(and empty block-comment-end) comment-end)))
(unless starter (error "No comment syntax defined"))
(beginning-of-line)
(let* ((eolpos (line-end-position))
(begpos (comment-search-forward eolpos t))
cpos indent)
(if (and comment-insert-comment-function (not begpos))
;; If no comment and c-i-c-f is set, let it do everything.
(funcall comment-insert-comment-function)
;; An existing comment?
(if begpos
(progn
(if (and (not (looking-at "[\t\n ]"))
(looking-at comment-end-skip))
;; The comment is empty and we have skipped all its space
;; and landed right before the comment-ender:
;; Go back to the middle of the space.
(forward-char (/ (skip-chars-backward " \t") -2)))
(setq cpos (point-marker)))
;; If none, insert one.
(save-excursion
;; Some `comment-indent-function's insist on not moving
;; comments that are in column 0, so we first go to the
;; likely target column.
(indent-to comment-column)
;; Ensure there's a space before the comment for things
;; like sh where it matters (as well as being neater).
(unless (memq (char-before) '(nil ?\n ?\t ?\s))
(insert ?\s))
(setq begpos (point))
(insert starter)
(setq cpos (point-marker))
(insert ender)))
(goto-char begpos)
;; Compute desired indent.
(setq indent (save-excursion (funcall comment-indent-function)))
;; If `indent' is nil and there's code before the comment, we can't
;; use `indent-according-to-mode', so we default to comment-column.
(unless (or indent (save-excursion (skip-chars-backward " \t") (bolp)))
(setq indent comment-column))
(if (not indent)
;; comment-indent-function refuses: delegate to line-indent.
(indent-according-to-mode)
;; If the comment is at the right of code, adjust the indentation.
(unless (save-excursion (skip-chars-backward " \t") (bolp))
(setq indent (comment-choose-indent indent)))
;; Update INDENT to leave at least one space
;; after other nonwhite text on the line.
(save-excursion
(skip-chars-backward " \t")
(unless (bolp)
(setq indent (max indent (1+ (current-column))))))
;; If that's different from comment's current position, change it.
(unless (= (current-column) indent)
(delete-region (point) (progn (skip-chars-backward " \t") (point)))
(indent-to indent)))
(goto-char cpos)
(set-marker cpos nil)))))
;;;###autoload
(defun comment-set-column (arg)
"Set the comment column based on point.
With no ARG, set the comment column to the current column.
With just minus as arg, kill any comment on this line.
With any other arg, set comment column to indentation of the previous comment
and then align or create a comment on this line at that column."
(interactive "P")
(cond
((eq arg '-) (comment-kill nil))
(arg
(comment-normalize-vars)
(save-excursion
(beginning-of-line)
(comment-search-backward)
(beginning-of-line)
(goto-char (comment-search-forward (line-end-position)))
(setq comment-column (current-column))
(message "Comment column set to %d" comment-column))
(comment-indent))
(t (setq comment-column (current-column))
(message "Comment column set to %d" comment-column))))
;;;###autoload
(defun comment-kill (arg)
"Kill the first comment on this line, if any.
With prefix ARG, kill comments on that many lines starting with this one."
(interactive "P")
(comment-normalize-vars)
(dotimes (_i (prefix-numeric-value arg))
(save-excursion
(beginning-of-line)
(let ((cs (comment-search-forward (line-end-position) t)))
(when cs
(goto-char cs)
(skip-syntax-backward " ")
(setq cs (point))
(comment-forward)
(kill-region cs (if (bolp) (1- (point)) (point)))
(indent-according-to-mode))))
(if arg (forward-line 1))))
(defun comment-padright (str &optional n)
"Construct a string composed of STR plus `comment-padding'.
It also adds N copies of the last non-whitespace chars of STR.
If STR already contains padding, the corresponding amount is
ignored from `comment-padding'.
N defaults to 0.
If N is `re', a regexp is returned instead, that would match
the string for any N."
(setq n (or n 0))
(when (and (stringp str) (not (string= "" str)))
;; Separate the actual string from any leading/trailing padding
(string-match "\\`\\s-*\\(.*?\\)\\s-*\\'" str)
(let ((s (match-string 1 str)) ;actual string
(lpad (substring str 0 (match-beginning 1))) ;left padding
(rpad (concat (substring str (match-end 1)) ;original right padding
(substring comment-padding ;additional right padding
(min (- (match-end 0) (match-end 1))
(length comment-padding)))))
;; We can only duplicate C if the comment-end has multiple chars
;; or if comments can be nested, else the comment-end `}' would
;; be turned into `}}}' where only the first ends the comment
;; and the rest becomes bogus junk.
(multi (not (and comment-quote-nested
;; comment-end is a single char
(string-match "\\`\\s-*\\S-\\s-*\\'" comment-end)))))
(if (not (symbolp n))
(concat lpad s (when multi (make-string n (aref str (1- (match-end 1))))) rpad)
;; construct a regexp that would match anything from just S
;; to any possible output of this function for any N.
(concat (mapconcat (lambda (c) (concat (regexp-quote (string c)) "?"))
lpad "") ;padding is not required
(regexp-quote s)
(when multi "+") ;the last char of S might be repeated
(mapconcat (lambda (c) (concat (regexp-quote (string c)) "?"))
rpad "")))))) ;padding is not required
(defun comment-padleft (str &optional n)
"Construct a string composed of `comment-padding' plus STR.
It also adds N copies of the first non-whitespace chars of STR.
If STR already contains padding, the corresponding amount is
ignored from `comment-padding'.
N defaults to 0.
If N is `re', a regexp is returned instead, that would match
the string for any N."
(setq n (or n 0))
(when (and (stringp str) (not (string= "" str)))
;; Only separate the left pad because we assume there is no right pad.
(string-match "\\`\\s-*" str)
(let ((s (substring str (match-end 0)))
(pad (concat (substring comment-padding
(min (- (match-end 0) (match-beginning 0))
(length comment-padding)))
(match-string 0 str)))
(c (aref str (match-end 0))) ;the first non-space char of STR
;; We can only duplicate C if the comment-end has multiple chars
;; or if comments can be nested, else the comment-end `}' would
;; be turned into `}}}' where only the first ends the comment
;; and the rest becomes bogus junk.
(multi (not (and comment-quote-nested
;; comment-end is a single char
(string-match "\\`\\s-*\\S-\\s-*\\'" comment-end)))))
(if (not (symbolp n))
(concat pad (when multi (make-string n c)) s)
;; Construct a regexp that would match anything from just S
;; to any possible output of this function for any N.
;; We match any number of leading spaces because this regexp will
;; be used for uncommenting where we might want to remove
;; uncomment markers with arbitrary leading space (because
;; they were aligned).
(concat "\\s-*"
(if multi (concat (regexp-quote (string c)) "*"))
(regexp-quote s))))))
;;;###autoload
(defun uncomment-region (beg end &optional arg)
"Uncomment each line in the BEG .. END region.
The numeric prefix ARG can specify a number of chars to remove from the
comment markers."
(interactive "*r\nP")
(comment-normalize-vars)
(when (> beg end) (setq beg (prog1 end (setq end beg))))
;; Bind `comment-use-global-state' to nil. While uncommenting a region
;; (which works a line at a time), a comment can appear to be
;; included in a mult-line string, but it is actually not.
(let ((comment-use-global-state nil))
(save-excursion
(funcall uncomment-region-function beg end arg))))
(defun uncomment-region-default (beg end &optional arg)
"Uncomment each line in the BEG .. END region.
The numeric prefix ARG can specify a number of chars to remove from the
comment markers."
(goto-char beg)
(setq end (copy-marker end))
(let* ((numarg (prefix-numeric-value arg))
(ccs comment-continue)
(srei (comment-padright ccs 're))
(csre (comment-padright comment-start 're))
(sre (and srei (concat "^\\s-*?\\(" srei "\\)")))
spt)
(while (and (< (point) end)
(setq spt (comment-search-forward end t)))
(let ((ipt (point))
;; Find the end of the comment.
(ept (progn
(goto-char spt)
(unless (or (comment-forward)
;; Allow non-terminated comments.
(eobp))
(error "Can't find the comment end"))
(point)))
(box nil)
(box-equal nil)) ;Whether we might be using `=' for boxes.
(save-restriction
(narrow-to-region spt ept)
;; Remove the comment-start.
(goto-char ipt)
(skip-syntax-backward " ")
;; A box-comment starts with a looong comment-start marker.
(when (and (or (and (= (- (point) (point-min)) 1)
(setq box-equal t)
(looking-at "=\\{7\\}")
(not (eq (char-before (point-max)) ?\n))
(skip-chars-forward "="))
(> (- (point) (point-min) (length comment-start)) 7))
(> (count-lines (point-min) (point-max)) 2))
(setq box t))
;; Skip the padding. Padding can come from comment-padding and/or
;; from comment-start, so we first check comment-start.
(if (or (save-excursion (goto-char (point-min)) (looking-at csre))
(looking-at (regexp-quote comment-padding)))
(goto-char (match-end 0)))
(when (and sre (looking-at (concat "\\s-*\n\\s-*" srei)))
(goto-char (match-end 0)))
(if (null arg) (delete-region (point-min) (point))
(let* ((opoint (point-marker))
(nchar (skip-syntax-backward " ")))
(delete-char (- numarg))
(unless (and (not (bobp))
(save-excursion (goto-char (point-min))
(looking-at comment-start-skip)))
;; If there's something left but it doesn't look like
;; a comment-start any more, just remove it.
(delete-region (point-min) opoint))))
;; Remove the end-comment (and leading padding and such).
(goto-char (point-max)) (comment-enter-backward)
;; Check for special `=' used sometimes in comment-box.
(when (and box-equal (not (eq (char-before (point-max)) ?\n)))
(let ((pos (point)))
;; skip `=' but only if there are at least 7.
(when (> (skip-chars-backward "=") -7) (goto-char pos))))
(unless (looking-at "\\(\n\\|\\s-\\)*\\'")
(when (and (bolp) (not (bobp))) (backward-char))
(if (null arg) (delete-region (point) (point-max))
(skip-syntax-forward " ")
(delete-char numarg)
(unless (or (eobp) (looking-at comment-end-skip))
;; If there's something left but it doesn't look like
;; a comment-end any more, just remove it.
(delete-region (point) (point-max)))))
;; Unquote any nested end-comment.
(comment-quote-nested comment-start comment-end t)
;; Eliminate continuation markers as well.
(when sre
(let* ((cce (comment-string-reverse (or comment-continue
comment-start)))
(erei (and box (comment-padleft cce 're)))
(ere (and erei (concat "\\(" erei "\\)\\s-*$"))))
(goto-char (point-min))
(while (progn
(if (and ere (re-search-forward
ere (line-end-position) t))
(replace-match "" t t nil (if (match-end 2) 2 1))
(setq ere nil))
(forward-line 1)
(re-search-forward sre (line-end-position) t))
(replace-match "" t t nil (if (match-end 2) 2 1)))))
;; Go to the end for the next comment.
(goto-char (point-max))))))
(set-marker end nil))
(defun comment-make-extra-lines (cs ce ccs cce min-indent max-indent &optional block)
"Make the leading and trailing extra lines.
This is used for `extra-line' style (or `box' style if BLOCK is specified)."
(let ((eindent 0))
(if (not block)
;; Try to match CS and CE's content so they align aesthetically.
(progn
(setq ce (comment-string-strip ce t t))
(when (string-match "\\(.+\\).*\n\\(.*?\\)\\1" (concat ce "\n" cs))
(setq eindent
(max (- (match-end 2) (match-beginning 2) (match-beginning 0))
0))))
;; box comment
(let* ((width (- max-indent min-indent))
(s (concat cs "a=m" cce))
(e (concat ccs "a=m" ce))
(c (if (string-match ".*\\S-\\S-" cs)
(aref cs (1- (match-end 0)))
(if (and (equal comment-end "") (string-match ".*\\S-" cs))
(aref cs (1- (match-end 0))) ?=)))
(re "\\s-*a=m\\s-*")
(_ (string-match re s))
(lcs (length cs))
(fill
(make-string (+ width (- (match-end 0)
(match-beginning 0) lcs 3)) c)))
(setq cs (replace-match fill t t s))
(when (and (not (string-match comment-start-skip cs))
(string-match "a=m" s))
;; The whitespace around CS cannot be ignored: put it back.
(setq re "a=m")
(setq fill (make-string (- width lcs) c))
(setq cs (replace-match fill t t s)))
(string-match re e)
(setq ce (replace-match fill t t e))))
(cons (concat cs "\n" (make-string min-indent ? ) ccs)
(concat cce "\n" (make-string (+ min-indent eindent) ? ) ce))))
(defmacro comment-with-narrowing (beg end &rest body)
"Execute BODY with BEG..END narrowing.
Space is added (and then removed) at the beginning for the text's
indentation to be kept as it was before narrowing."
(declare (debug t) (indent 2))
(let ((bindent (make-symbol "bindent")))
`(let ((,bindent (save-excursion (goto-char ,beg) (current-column))))
(save-restriction
(narrow-to-region ,beg ,end)
(goto-char (point-min))
(insert (make-string ,bindent ? ))
(prog1
(progn ,@body)
;; remove the bindent
(save-excursion
(goto-char (point-min))
(when (looking-at " *")
(let ((n (min (- (match-end 0) (match-beginning 0)) ,bindent)))
(delete-char n)
(setq ,bindent (- ,bindent n))))
(end-of-line)
(let ((e (point)))
(beginning-of-line)
(while (and (> ,bindent 0) (re-search-forward " *" e t))
(let ((n (min ,bindent (- (match-end 0) (match-beginning 0) 1))))
(goto-char (match-beginning 0))
(delete-char n)
(setq ,bindent (- ,bindent n)))))))))))
(defun comment-add (arg)
"Compute the number of extra comment starter characters.
\(Extra semicolons in Lisp mode, extra stars in C mode, etc.)
If ARG is non-nil, just follow ARG.
If the comment starter is multi-char, just follow ARG.
Otherwise obey `comment-add'."
(if (and (null arg) (= (string-match "[ \t]*\\'" comment-start) 1))
(* comment-add 1)
(1- (prefix-numeric-value arg))))
(defun comment-region-internal (beg end cs ce
&optional ccs cce block lines indent)
"Comment region BEG .. END.
CS and CE are the comment start string and comment end string,
respectively. CCS and CCE are the comment continuation strings
for the start and end of lines, respectively (default to CS and CE).
BLOCK indicates that end of lines should be marked with either CCE,
CE or CS \(if CE is empty) and that those markers should be aligned.
LINES indicates that an extra lines will be used at the beginning
and end of the region for CE and CS.
INDENT indicates to put CS and CCS at the current indentation of
the region rather than at left margin."
;;(assert (< beg end))
(let ((no-empty (not (or (eq comment-empty-lines t)
(and comment-empty-lines (zerop (length ce))))))
ce-sanitized)
;; Sanitize CE and CCE.
(if (and (stringp ce) (string= "" ce)) (setq ce nil))
(setq ce-sanitized ce)
(if (and (stringp cce) (string= "" cce)) (setq cce nil))
;; If CE is empty, multiline cannot be used.
(unless ce (setq ccs nil cce nil))
;; Should we mark empty lines as well ?
(if (or ccs block lines) (setq no-empty nil))
;; Make sure we have end-markers for BLOCK mode.
(when block (unless ce (setq ce (comment-string-reverse cs))))
;; If BLOCK is not requested, we don't need CCE.
(unless block (setq cce nil))
;; Continuation defaults to the same as CS and CE.
(unless ccs (setq ccs cs cce ce))
(save-excursion
(goto-char end)
;; If the end is not at the end of a line and the comment-end
;; is implicit (i.e. a newline), explicitly insert a newline.
(unless (or ce-sanitized (eolp)) (insert "\n") (indent-according-to-mode))
(comment-with-narrowing beg end
(let ((min-indent (point-max))
(max-indent 0))
(goto-char (point-min))
;; Quote any nested comment marker
(comment-quote-nested comment-start comment-end nil)
;; Loop over all lines to find the needed indentations.
(goto-char (point-min))
(while
(progn
(unless (looking-at "[ \t]*$")
(setq min-indent (min min-indent (current-indentation))))
(end-of-line)
(setq max-indent (max max-indent (current-column)))
(not (or (eobp) (progn (forward-line) nil)))))
(setq max-indent
(+ max-indent (max (length cs) (length ccs))
;; Inserting ccs can change max-indent by (1- tab-width)
;; but only if there are TABs in the boxed text, of course.
(if (save-excursion (goto-char beg)
(search-forward "\t" end t))
(1- tab-width) 0)))
(unless indent (setq min-indent 0))
;; make the leading and trailing lines if requested
(when lines
(let ((csce
(comment-make-extra-lines
cs ce ccs cce min-indent max-indent block)))
(setq cs (car csce))
(setq ce (cdr csce))))
(goto-char (point-min))
;; Loop over all lines from BEG to END.
(while
(progn
(unless (and no-empty (looking-at "[ \t]*$"))
(move-to-column min-indent t)
(insert cs) (setq cs ccs) ;switch to CCS after the first line
(end-of-line)
(if (eobp) (setq cce ce))
(when cce
(when block (move-to-column max-indent t))
(insert cce)))
(end-of-line)
(not (or (eobp) (progn (forward-line) nil))))))))))
;;;###autoload
(defun comment-region (beg end &optional arg)
"Comment or uncomment each line in the region.
With just \\[universal-argument] prefix arg, uncomment each line in region BEG .. END.
Numeric prefix ARG means use ARG comment characters.
If ARG is negative, delete that many comment characters instead.
The strings used as comment starts are built from `comment-start'
and `comment-padding'; the strings used as comment ends are built
from `comment-end' and `comment-padding'.
By default, the `comment-start' markers are inserted at the
current indentation of the region, and comments are terminated on
each line (even for syntaxes in which newline does not end the
comment and blank lines do not get comments). This can be
changed with `comment-style'."
(interactive "*r\nP")
(comment-normalize-vars)
(if (> beg end) (let (mid) (setq mid beg beg end end mid)))
(save-excursion
;; FIXME: maybe we should call uncomment depending on ARG.
(funcall comment-region-function beg end arg)))
(defun comment-region-default (beg end &optional arg)
(let* ((numarg (prefix-numeric-value arg))
(style (cdr (assoc comment-style comment-styles)))
(lines (nth 2 style))
(block (nth 1 style))
(multi (nth 0 style)))
;; We use `chars' instead of `syntax' because `\n' might be
;; of end-comment syntax rather than of whitespace syntax.
;; sanitize BEG and END
(goto-char beg) (skip-chars-forward " \t\n\r") (beginning-of-line)
(setq beg (max beg (point)))
(goto-char end) (skip-chars-backward " \t\n\r") (end-of-line)
(setq end (min end (point)))
(if (>= beg end) (error "Nothing to comment"))
;; sanitize LINES
(setq lines
(and
lines ;; multi
(progn (goto-char beg) (beginning-of-line)
(skip-syntax-forward " ")
(>= (point) beg))
(progn (goto-char end) (end-of-line) (skip-syntax-backward " ")
(<= (point) end))
(or block (not (string= "" comment-end)))
(or block (progn (goto-char beg) (search-forward "\n" end t)))))
;; don't add end-markers just because the user asked for `block'
(unless (or lines (string= "" comment-end)) (setq block nil))
(cond
((consp arg) (uncomment-region beg end))
((< numarg 0) (uncomment-region beg end (- numarg)))
(t
(let ((multi-char (/= (string-match "[ \t]*\\'" comment-start) 1))
indent triple)
(if (eq (nth 3 style) 'multi-char)
(save-excursion
(goto-char beg)
(setq indent multi-char
;; Triple if we will put the comment starter at the margin
;; and the first line of the region isn't indented
;; at least two spaces.
triple (and (not multi-char) (looking-at "\t\\| "))))
(setq indent (nth 3 style)))
;; In Lisp and similar modes with one-character comment starters,
;; double it by default if `comment-add' says so.
;; If it isn't indented, triple it.
(if (and (null arg) (not multi-char))
(setq numarg (* comment-add (if triple 2 1)))
(setq numarg (1- (prefix-numeric-value arg))))
(comment-region-internal
beg end
(let ((s (comment-padright comment-start numarg)))
(if (string-match comment-start-skip s) s
(comment-padright comment-start)))
(let ((s (comment-padleft comment-end numarg)))
(and s (if (string-match comment-end-skip s) s
(comment-padright comment-end))))
(if multi (comment-padright comment-continue numarg))
(if multi
(comment-padleft (comment-string-reverse comment-continue) numarg))
block
lines
indent))))))
;;;###autoload
(defun comment-box (beg end &optional arg)
"Comment out the BEG .. END region, putting it inside a box.
The numeric prefix ARG specifies how many characters to add to begin- and
end- comment markers additionally to what `comment-add' already specifies."
(interactive "*r\np")
(comment-normalize-vars)
(let ((comment-style (if (cadr (assoc comment-style comment-styles))
'box-multi 'box)))
(comment-region beg end (+ comment-add arg))))
(defun comment-only-p (beg end)
"Return non-nil if the text between BEG and END is all comments."
(save-excursion
(goto-char beg)
(comment-forward (point-max))
(<= end (point))))
;;;###autoload
(defun comment-or-uncomment-region (beg end &optional arg)
"Call `comment-region', unless the region only consists of comments,
in which case call `uncomment-region'. If a prefix arg is given, it
is passed on to the respective function."
(interactive "*r\nP")
(comment-normalize-vars)
(funcall (if (comment-only-p beg end)
'uncomment-region 'comment-region)
beg end arg))
;;;###autoload
(defun comment-dwim (arg)
"Call the comment command you want (Do What I Mean).
If the region is active and `transient-mark-mode' is on, call
`comment-region' (unless it only consists of comments, in which
case it calls `uncomment-region').
Else, if the current line is empty, call `comment-insert-comment-function'
if it is defined, otherwise insert a comment and indent it.
Else if a prefix ARG is specified, call `comment-kill'.
Else, call `comment-indent'.
You can configure `comment-style' to change the way regions are commented."
(interactive "*P")
(comment-normalize-vars)
(if (and mark-active transient-mark-mode)
(comment-or-uncomment-region (region-beginning) (region-end) arg)
(if (save-excursion (beginning-of-line) (not (looking-at "\\s-*$")))
;; FIXME: If there's no comment to kill on this line and ARG is
;; specified, calling comment-kill is not very clever.
(if arg (comment-kill (and (integerp arg) arg)) (comment-indent))
;; Inserting a comment on a blank line. comment-indent calls
;; c-i-c-f if needed in the non-blank case.
(if comment-insert-comment-function
(funcall comment-insert-comment-function)
(let ((add (comment-add arg)))
;; Some modes insist on keeping column 0 comment in column 0
;; so we need to move away from it before inserting the comment.
(indent-according-to-mode)
(insert (comment-padright comment-start add))
(save-excursion
(unless (string= "" comment-end)
(insert (comment-padleft comment-end add)))
(indent-according-to-mode)))))))
;;;###autoload
(defcustom comment-auto-fill-only-comments nil
"Non-nil means to only auto-fill inside comments.
This has no effect in modes that do not define a comment syntax."
:type 'boolean
:group 'comment)
(defun comment-valid-prefix-p (prefix compos)
"Check that the adaptive fill prefix is consistent with the context.
PREFIX is the prefix (presumably guessed by `adaptive-fill-mode').
COMPOS is the position of the beginning of the comment we're in, or nil
if we're not inside a comment."
;; This consistency checking is mostly needed to workaround the limitation
;; of auto-fill-mode whose paragraph-determination doesn't pay attention
;; to comment boundaries.
(if (null compos)
;; We're not inside a comment: the prefix shouldn't match
;; a comment-starter.
(not (and comment-start comment-start-skip
(string-match comment-start-skip prefix)))
(or
;; Accept any prefix if the current comment is not EOL-terminated.
(save-excursion (goto-char compos) (comment-forward) (not (bolp)))
;; Accept any prefix that starts with the same comment-start marker
;; as the current one.
(when (string-match (concat "\\`[ \t]*\\(?:" comment-start-skip "\\)")
prefix)
(let ((prefix-com (comment-string-strip (match-string 0 prefix) nil t)))
(string-match "\\`[ \t]*" prefix-com)
(let* ((prefix-space (match-string 0 prefix-com))
(prefix-indent (string-width prefix-space))
(prefix-comstart (substring prefix-com (match-end 0))))
(save-excursion
(goto-char compos)
;; The comstart marker is the same.
(and (looking-at (regexp-quote prefix-comstart))
;; The indentation as well.
(or (= prefix-indent
(- (current-column) (current-left-margin)))
;; Check the indentation in two different ways, just
;; to try and avoid most of the potential funny cases.
(equal prefix-space
(buffer-substring (point)
(progn (move-to-left-margin)
(point)))))))))))))
;;;###autoload
(defun comment-indent-new-line (&optional soft)
"Break line at point and indent, continuing comment if within one.
This indents the body of the continued comment
under the previous comment line.
This command is intended for styles where you write a comment per line,
starting a new comment (and terminating it if necessary) on each line.
If you want to continue one comment across several lines, use \\[newline-and-indent].
If a fill column is specified, it overrides the use of the comment column
or comment indentation.
The inserted newline is marked hard if variable `use-hard-newlines' is true,
unless optional argument SOFT is non-nil."
(interactive)
(comment-normalize-vars t)
(let (compos comin)
;; If we are not inside a comment and we only auto-fill comments,
;; don't do anything (unless no comment syntax is defined).
(unless (and comment-start
comment-auto-fill-only-comments
(not (called-interactively-p 'interactive))
(not (save-excursion
(prog1 (setq compos (comment-beginning))
(setq comin (point))))))
;; Now we know we should auto-fill.
;; Insert the newline before removing empty space so that markers
;; get preserved better.
(if soft (insert-and-inherit ?\n) (newline 1))
(save-excursion (forward-char -1) (delete-horizontal-space))
(delete-horizontal-space)
(if (and fill-prefix (not adaptive-fill-mode))
;; Blindly trust a non-adaptive fill-prefix.
(progn
(indent-to-left-margin)
(insert-before-markers-and-inherit fill-prefix))
;; If necessary check whether we're inside a comment.
(unless (or compos (null comment-start))
(save-excursion
(backward-char)
(setq compos (comment-beginning))
(setq comin (point))))
(cond
;; If there's an adaptive prefix, use it unless we're inside
;; a comment and the prefix is not a comment starter.
((and fill-prefix
(comment-valid-prefix-p fill-prefix compos))
(indent-to-left-margin)
(insert-and-inherit fill-prefix))
;; If we're not inside a comment, just try to indent.
((not compos) (indent-according-to-mode))
(t
(let* ((comment-column
;; The continuation indentation should be somewhere between
;; the current line's indentation (plus 2 for good measure)
;; and the current comment's indentation, with a preference
;; for comment-column.
(save-excursion
;; FIXME: use prev line's info rather than first line's.
(goto-char compos)
(min (current-column) (max comment-column
(+ 2 (current-indentation))))))
(comstart (buffer-substring compos comin))
(normalp
(string-match (regexp-quote (comment-string-strip
comment-start t t))
comstart))
(comment-end
(if normalp comment-end
;; The comment starter is not the normal comment-start
;; so we can't just use comment-end.
(save-excursion
(goto-char compos)
(if (not (comment-forward)) comment-end
(comment-string-strip
(buffer-substring
(save-excursion (comment-enter-backward) (point))
(point))
nil t)))))
(comment-start comstart)
(continuep (or comment-multi-line
(cadr (assoc comment-style comment-styles))))
;; Force comment-continue to be recreated from comment-start.
;; FIXME: wrong if comment-continue was set explicitly!
;; FIXME: use prev line's continuation if available.
(comment-continue nil))
(if (and comment-multi-line (> (length comment-end) 0))
(indent-according-to-mode)
(insert-and-inherit ?\n)
(forward-char -1)
(comment-indent continuep)
(save-excursion
(let ((pt (point)))
(end-of-line)
(let ((comend (buffer-substring pt (point))))
;; The 1+ is to make sure we delete the \n inserted above.
(delete-region pt (1+ (point)))
(end-of-line 0)
(insert comend))))))))))))
(provide 'newcomment)
;;; newcomment.el ends here
|