all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
blob d44c9d6e23dae142561bdfb24a42958ba0bb97e4 70065 bytes (raw)
name: lisp/emacs-lisp/lisp-mode.el 	 # note: path name is non-authoritative(*)

   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
 
;;; lisp-mode.el --- Lisp mode, and its idiosyncratic commands  -*- lexical-binding:t -*-

;; Copyright (C) 1985-1986, 1999-2023 Free Software Foundation, Inc.

;; Maintainer: emacs-devel@gnu.org
;; Keywords: lisp, languages
;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; The base major mode for editing Lisp code (used also for Emacs Lisp).
;; This mode is documented in the Emacs manual.

;;; Code:

(eval-when-compile (require 'cl-lib))
(eval-when-compile (require 'subr-x))

(defvar font-lock-comment-face)
(defvar font-lock-doc-face)
(defvar font-lock-keywords-case-fold-search)
(defvar font-lock-string-face)

(define-abbrev-table 'lisp-mode-abbrev-table ()
  "Abbrev table for Lisp mode.")

(defvar lisp-data-mode-syntax-table
  (let ((table (make-syntax-table))
        (i 0))
    (while (< i ?0)
      (modify-syntax-entry i "_   " table)
      (setq i (1+ i)))
    (setq i (1+ ?9))
    (while (< i ?A)
      (modify-syntax-entry i "_   " table)
      (setq i (1+ i)))
    (setq i (1+ ?Z))
    (while (< i ?a)
      (modify-syntax-entry i "_   " table)
      (setq i (1+ i)))
    (setq i (1+ ?z))
    (while (< i 128)
      (modify-syntax-entry i "_   " table)
      (setq i (1+ i)))
    (modify-syntax-entry ?\s "    " table)
    ;; Non-break space acts as whitespace.
    (modify-syntax-entry ?\xa0 "    " table)
    (modify-syntax-entry ?\t "    " table)
    (modify-syntax-entry ?\f "    " table)
    (modify-syntax-entry ?\n ">   " table)
    (modify-syntax-entry ?\; "<   " table)
    (modify-syntax-entry ?` "'   " table)
    (modify-syntax-entry ?' "'   " table)
    (modify-syntax-entry ?, "'   " table)
    (modify-syntax-entry ?@ "_ p" table)
    ;; Used to be singlequote; changed for flonums.
    (modify-syntax-entry ?. "_   " table)
    (modify-syntax-entry ?# "'   " table)
    (modify-syntax-entry ?\" "\"    " table)
    (modify-syntax-entry ?\\ "\\   " table)
    (modify-syntax-entry ?\( "()  " table)
    (modify-syntax-entry ?\) ")(  " table)
    (modify-syntax-entry ?\[ "(]" table)
    (modify-syntax-entry ?\] ")[" table)
    table)
  "Parent syntax table used in Lisp modes.")

(defvar lisp-mode-syntax-table
  (let ((table (make-syntax-table lisp-data-mode-syntax-table)))
    (modify-syntax-entry ?\[ "_   " table)
    (modify-syntax-entry ?\] "_   " table)
    (modify-syntax-entry ?# "' 14" table)
    (modify-syntax-entry ?| "\" 23bn" table)
    table)
  "Syntax table used in `lisp-mode'.")

(rx-define lisp-mode-symbol (+ (| (syntax word)
                                  (syntax symbol)
                                  (: "\\" nonl))))

(eval-and-compile
  (defconst lisp-mode-symbol-regexp (rx lisp-mode-symbol)))

(defvar lisp-imenu-generic-expression
  (list
   (list nil
	 (purecopy (concat "^\\s-*("
			   (regexp-opt
			    '("defun" "defmacro"
                              ;; Elisp.
                              "defun*" "defsubst" "define-inline"
			      "define-advice" "defadvice" "define-skeleton"
			      "define-compilation-mode" "define-minor-mode"
			      "define-global-minor-mode"
			      "define-globalized-minor-mode"
			      "define-derived-mode" "define-generic-mode"
			      "ert-deftest"
			      "cl-defun" "cl-defsubst" "cl-defmacro"
			      "cl-define-compiler-macro" "cl-defgeneric"
			      "cl-defmethod"
                              ;; CL.
			      "define-compiler-macro" "define-modify-macro"
			      "defsetf" "define-setf-expander"
			      "define-method-combination"
                              ;; CLOS and EIEIO
			      "defgeneric" "defmethod")
                            t)
			   "\\s-+\\(" (rx lisp-mode-symbol) "\\)"))
	 2)
   ;; Like the previous, but uses a quoted symbol as the name.
   (list nil
	 (purecopy (concat "^\\s-*("
			   (regexp-opt
			    '("defalias" "define-obsolete-function-alias")
                            t)
			   "\\s-+'\\(" (rx lisp-mode-symbol) "\\)"))
	 2)
   (list (purecopy "Variables")
	 (purecopy (concat "^\\s-*("
			   (regexp-opt
			    '(;; Elisp
                              "defconst" "defcustom"
                              ;; CL
                              "defconstant"
			      "defparameter" "define-symbol-macro")
                            t)
			   "\\s-+\\(" (rx lisp-mode-symbol) "\\)"))
	 2)
   ;; For `defvar'/`defvar-local', we ignore (defvar FOO) constructs.
   (list (purecopy "Variables")
	 (purecopy (concat "^\\s-*(defvar\\(?:-local\\)?\\s-+\\("
                           (rx lisp-mode-symbol) "\\)"
			   "[[:space:]\n]+[^)]"))
	 1)
   (list (purecopy "Types")
	 (purecopy (concat "^\\s-*("
			   (regexp-opt
			    '(;; Elisp
                              "defgroup" "deftheme"
                              "define-widget" "define-error"
			      "defface" "cl-deftype" "cl-defstruct"
                              ;; CL
                              "deftype" "defstruct"
			      "define-condition" "defpackage"
                              ;; CLOS and EIEIO
                              "defclass")
                            t)
			   "\\s-+'?\\(" (rx lisp-mode-symbol) "\\)"))
	 2))

  "Imenu generic expression for Lisp mode.  See `imenu-generic-expression'.")

(defconst lisp-mode-autoload-regexp
  "^;;;###\\(\\([-[:alnum:]]+?\\)-\\)?\\(autoload\\)"
  "Regexp to match autoload cookies.
The second group matches package names used to redirect autoloads
to a package-local <package>-loaddefs.el file.")

;; This was originally in autoload.el and is still used there.
(put 'autoload 'doc-string-elt 3)
(put 'defmethod 'doc-string-elt 3)
(put 'defvar   'doc-string-elt 3)
(put 'defconst 'doc-string-elt 3)
(put 'defalias 'doc-string-elt 3)
(put 'defvaralias 'doc-string-elt 3)
(put 'define-category 'doc-string-elt 2)
;; CL
(put 'defconstant 'doc-string-elt 3)
(put 'define-compiler-macro 'doc-string-elt 3)
(put 'define-setf-expander 'doc-string-elt 3)
(put 'defparameter 'doc-string-elt 3)
(put 'defstruct 'doc-string-elt 2)
(put 'deftype 'doc-string-elt 3)

(defvar lisp-doc-string-elt-property 'doc-string-elt
  "The symbol property that holds the docstring position info.")

(defconst lisp-prettify-symbols-alist '(("lambda"  . ?λ))
  "Alist of symbol/\"pretty\" characters to be displayed.")

;;;; Font-lock support.

(defun lisp--match-hidden-arg (limit)
  (let ((res nil))
    (forward-line 0)
    (while
        (let ((ppss (parse-partial-sexp (point)
                                        (line-end-position)
                                        -1)))
          (skip-syntax-forward " )")
          (if (or (>= (car ppss) 0)
                  (eolp)
                  (looking-at ";")
                  (nth 8 (syntax-ppss))) ;Within a string or comment.
              (progn
                (forward-line 1)
                (< (point) limit))
            (looking-at ".*")           ;Set the match-data.
	    (forward-line 1)
            (setq res (point))
            nil)))
    res))

(defun lisp--el-non-funcall-position-p (pos)
  "Heuristically determine whether POS is an evaluated position."
  (declare (obsolete lisp--el-funcall-position-p "28.1"))
  (not (lisp--el-funcall-position-p pos)))

(defun lisp--el-funcall-position-p (pos)
  "Heuristically determine whether POS is an evaluated position."
  (save-match-data
    (save-excursion
      (ignore-errors
        (goto-char pos)
        ;; '(lambda ..) is not a funcall position, but #'(lambda ...) is.
        (if (eql (char-before) ?\')
            (eql (char-before (1- (point))) ?#)
          (let* ((ppss (syntax-ppss))
                 (paren-posns (nth 9 ppss))
                 (parent
                  (when paren-posns
                    (goto-char (car (last paren-posns))) ;(up-list -1)
                    (cond
                     ((ignore-errors
                        (and (eql (char-after) ?\()
                             (when (cdr paren-posns)
                               (goto-char (car (last paren-posns 2)))
                               (looking-at "(\\_<let\\*?\\_>"))))
                      (goto-char (match-end 0))
                      'let)
                     ((looking-at
                       (rx "("
                           (group-n 1 (+ (or (syntax w) (syntax _))))
                           symbol-end))
                      (prog1 (intern-soft (match-string-no-properties 1))
                        (goto-char (match-end 1))))))))
            (pcase parent
              ('declare nil)
              ('let
                (forward-sexp 1)
                (>= pos (point)))
              ((or 'defun 'defmacro 'cl-defmethod 'cl-defun)
                (forward-sexp 2)
                (>= pos (point)))
              ('condition-case
                  ;; If (cdr paren-posns), then we're in the BODY
                  ;; of HANDLERS.
                  (or (cdr paren-posns)
                      (progn
                        (forward-sexp 1)
                        ;; If we're in the second form, then we're in
                        ;; a funcall position.
                        (< (point) pos (progn (forward-sexp 1)
                                              (point))))))
              (_ t))))))))

(defun lisp--el-match-keyword (limit)
  ;; FIXME: Move to elisp-mode.el.
  (catch 'found
    (while (re-search-forward
            (concat "(\\(" (rx lisp-mode-symbol) "\\)\\_>")
            limit t)
      (let ((sym (intern-soft (match-string 1))))
	(when (and (or (special-form-p sym) (macrop sym))
                   (not (get sym 'no-font-lock-keyword))
                   (lisp--el-funcall-position-p (match-beginning 0)))
	  (throw 'found t))))))

(defmacro let-when-compile (bindings &rest body)
  "Like `let*', but allow for compile time optimization.
Use BINDINGS as in regular `let*', but in BODY each usage should
be wrapped in `eval-when-compile'.
This will generate compile-time constants from BINDINGS."
  (declare (indent 1) (debug let))
  (letrec ((loop
            (lambda (bindings)
              (if (null bindings)
                  (macroexpand-all (macroexp-progn body)
                                   macroexpand-all-environment)
                (let ((binding (pop bindings)))
                  (cl-progv (list (car binding))
                      (list (eval (nth 1 binding) t))
                    (funcall loop bindings)))))))
    (funcall loop bindings)))

(defun elisp--font-lock-backslash ()
  (let* ((beg0 (match-beginning 0))
         (end0 (match-end 0))
         (ppss (save-excursion (syntax-ppss beg0))))
    (and (nth 3 ppss)                  ;Inside a string.
         (not (nth 5 ppss))            ;The \ is not itself \-escaped.
         ;; Don't highlight the \( introduced because of
         ;; `open-paren-in-column-0-is-defun-start'.
         (not (eq ?\n (char-before beg0)))
         (equal (ignore-errors
                  (car (read-from-string
                        (format "\"%s\""
                                (buffer-substring-no-properties
                                 beg0 end0)))))
                (buffer-substring-no-properties (1+ beg0) end0))
         `(face ,font-lock-warning-face
                help-echo "This \\ has no effect"))))

(defun lisp--match-confusable-symbol-character  (limit)
  ;; Match a confusable character within a Lisp symbol.
  (catch 'matched
    (while t
      (if (re-search-forward help-uni-confusables-regexp limit t)
          ;; Skip confusables which are backslash escaped, or inside
          ;; strings or comments.
          (save-match-data
            (unless (or (eq (char-before (match-beginning 0)) ?\\)
                        (nth 8 (syntax-ppss)))
              (throw 'matched t)))
        (throw 'matched nil)))))

(defun lisp-mode--search-key (char bound)
  (catch 'found
    (while (re-search-forward
            (concat "\\_<" char (rx lisp-mode-symbol) "\\_>")
            bound t)
      (when (or (< (match-beginning 0) (+ (point-min) 2))
                ;; A quoted white space before the &/: means that this
                ;; is not the start of a :keyword or an &option.
                (not (eql (char-after (- (match-beginning 0) 2))
                          ?\\))
                (not (memq (char-after (- (match-beginning 0) 1))
                           '(?\s ?\n ?\t))))
        (throw 'found t)))))

(let-when-compile
    ((lisp-fdefs '("defmacro" "defun"))
     (lisp-vdefs '("defvar"))
     (lisp-kw '("cond" "if" "while" "let" "let*" "progn" "prog1"
                "prog2" "lambda" "unwind-protect" "condition-case"
                "when" "unless" "with-output-to-string"
                "ignore-errors" "dotimes" "dolist" "declare"))
     (lisp-errs '("warn" "error" "signal"))
     ;; Elisp constructs.  Now they are update dynamically
     ;; from obarray but they are also used for setting up
     ;; the keywords for Common Lisp.
     (el-fdefs '("defsubst" "cl-defsubst" "define-inline"
                 "define-advice" "defadvice" "defalias"
                 "define-derived-mode" "define-minor-mode"
                 "define-generic-mode" "define-global-minor-mode"
                 "define-globalized-minor-mode" "define-skeleton"
                 "define-widget" "ert-deftest"))
     (el-vdefs '("defconst" "defcustom" "defvaralias" "defvar-local"
                 "defface"))
     (el-tdefs '("defgroup" "deftheme"))
     (el-errs '("user-error"))
     ;; Common-Lisp constructs supported by EIEIO.  FIXME: namespace.
     (eieio-fdefs '("defgeneric" "defmethod"))
     (eieio-tdefs '("defclass"))
     ;; Common-Lisp constructs supported by cl-lib.
     (cl-lib-fdefs '("defmacro" "defsubst" "defun" "defmethod" "defgeneric"))
     (cl-lib-tdefs '("defstruct" "deftype"))
     (cl-lib-errs '("assert" "check-type"))
     ;; Common-Lisp constructs not supported by cl-lib.
     (cl-fdefs '("defsetf" "define-method-combination"
                 "define-condition" "define-setf-expander"
                 ;; "define-function"??
                 "define-compiler-macro" "define-modify-macro"))
     (cl-vdefs '("define-symbol-macro" "defconstant" "defparameter"))
     (cl-tdefs '("defpackage" "defstruct" "deftype"))
     (cl-kw '("block" "break" "case" "ccase" "compiler-let" "ctypecase"
              "declaim" "destructuring-bind" "do" "do*"
              "ecase" "etypecase" "eval-when" "flet" "flet*"
              "go" "handler-case" "handler-bind" "in-package" ;; "inline"
              "labels" "letf" "locally" "loop"
              "macrolet" "multiple-value-bind" "multiple-value-prog1"
              "proclaim" "prog" "prog*" "progv"
              "restart-case" "restart-bind" "return" "return-from"
              "symbol-macrolet" "tagbody" "the" "typecase"
              "with-accessors" "with-compilation-unit"
              "with-condition-restarts" "with-hash-table-iterator"
              "with-input-from-string" "with-open-file"
              "with-open-stream" "with-package-iterator"
              "with-simple-restart" "with-slots" "with-standard-io-syntax"))
     (cl-errs '("abort" "cerror")))
  (let ((vdefs (eval-when-compile
                 (append lisp-vdefs el-vdefs cl-vdefs)))
        (tdefs (eval-when-compile
                 (append el-tdefs eieio-tdefs cl-tdefs cl-lib-tdefs
                         (mapcar (lambda (s) (concat "cl-" s)) cl-lib-tdefs))))
        ;; Elisp and Common Lisp definers.
        (el-defs-re (eval-when-compile
                      (regexp-opt (append lisp-fdefs lisp-vdefs
                                          el-fdefs el-vdefs el-tdefs
                                          (mapcar (lambda (s) (concat "cl-" s))
                                                  (append cl-lib-fdefs cl-lib-tdefs))
                                          eieio-fdefs eieio-tdefs)
                                  t)))
        (cl-defs-re (eval-when-compile
                      (regexp-opt (append lisp-fdefs lisp-vdefs
                                          cl-lib-fdefs cl-lib-tdefs
                                          eieio-fdefs eieio-tdefs
                                          cl-fdefs cl-vdefs cl-tdefs)
                                  t)))
        ;; Common Lisp keywords (Elisp keywords are handled dynamically).
        (cl-kws-re (eval-when-compile
                     (regexp-opt (append lisp-kw cl-kw) t)))
        ;; Elisp and Common Lisp "errors".
        (el-errs-re (eval-when-compile
                      (regexp-opt (append (mapcar (lambda (s) (concat "cl-" s))
                                                  cl-lib-errs)
                                          lisp-errs el-errs)
                                  t)))
        (cl-errs-re (eval-when-compile
                      (regexp-opt (append lisp-errs cl-lib-errs cl-errs) t))))
    (dolist (v vdefs)
      (put (intern v) 'lisp-define-type 'var))
    (dolist (v tdefs)
      (put (intern v) 'lisp-define-type 'type))

    (define-obsolete-variable-alias 'lisp-font-lock-keywords-1
        'lisp-el-font-lock-keywords-1 "24.4")
    (defconst lisp-el-font-lock-keywords-1
      `( ;; Definitions.
        (,(concat "(" el-defs-re "\\_>"
                  ;; Any whitespace and defined object.
                  "[ \t']*"
                  "\\(([ \t']*\\)?" ;; An opening paren.
                  "\\(\\(setf\\)[ \t]+" (rx lisp-mode-symbol)
                  "\\|" (rx lisp-mode-symbol) "\\)?")
          (1 font-lock-keyword-face)
          (3 (let ((type (get (intern-soft (match-string 1)) 'lisp-define-type)))
               (cond ((eq type 'var) font-lock-variable-name-face)
                     ((eq type 'type) font-lock-type-face)
                     ;; If match-string 2 is non-nil, we encountered a
                     ;; form like (defalias (intern (concat s "-p"))),
                     ;; unless match-string 4 is also there.  Then its a
                     ;; defmethod with (setf foo) as name.
                     ((or (not (match-string 2)) ;; Normal defun.
                          (and (match-string 2)  ;; Setf method.
                               (match-string 4)))
                      font-lock-function-name-face)))
             nil t))
        ;; Emacs Lisp autoload cookies.  Supports the slightly different
        ;; forms used by mh-e, calendar, etc.
        (,lisp-mode-autoload-regexp (3 font-lock-warning-face prepend)
                                    (2 font-lock-function-name-face prepend t)))
      "Subdued level highlighting for Emacs Lisp mode.")

    (defconst lisp-cl-font-lock-keywords-1
      `( ;; Definitions.
        (,(concat "(" cl-defs-re "\\_>"
                  ;; Any whitespace and defined object.
                  "[ \t']*"
                  "\\(([ \t']*\\)?" ;; An opening paren.
                  "\\(\\(setf\\)[ \t]+" (rx lisp-mode-symbol)
                  "\\|" (rx lisp-mode-symbol) "\\)?")
          (1 font-lock-keyword-face)
          (3 (let ((type (get (intern-soft (match-string 1)) 'lisp-define-type)))
               (cond ((eq type 'var) font-lock-variable-name-face)
                     ((eq type 'type) font-lock-type-face)
                     ((or (not (match-string 2)) ;; Normal defun.
                          (and (match-string 2)  ;; Setf function.
                               (match-string 4)))
                      font-lock-function-name-face)))
             nil t)))
      "Subdued level highlighting for Lisp modes.")

    (define-obsolete-variable-alias 'lisp-font-lock-keywords-2
        'lisp-el-font-lock-keywords-2 "24.4")
    (defconst lisp-el-font-lock-keywords-2
      (append
       lisp-el-font-lock-keywords-1
       `( ;; Regexp negated char group.
         ("\\[\\(\\^\\)" 1 font-lock-negation-char-face prepend)
         ;; Erroneous structures.
         (,(concat "(" el-errs-re "\\_>")
          (1 font-lock-warning-face))
         ;; Control structures.  Common Lisp forms.
         (lisp--el-match-keyword . 1)
         ;; Exit/Feature symbols as constants.
         (,(concat "(\\(catch\\|throw\\|featurep\\|provide\\|require\\)\\_>"
                   "[ \t']*\\(" (rx lisp-mode-symbol) "\\)?")
           (1 font-lock-keyword-face)
           (2 font-lock-constant-face nil t))
         ;; Words inside \\[], \\<>, \\{} or \\`' tend to be for
         ;; `substitute-command-keys'.
         (,(rx "\\\\" (or (seq "[" (group-n 1 lisp-mode-symbol) "]")
                          (seq "`" (group-n 1
                                     ;; allow multiple words, e.g. "C-x a"
                                     lisp-mode-symbol (* " " lisp-mode-symbol))
                               "'")))
          (1 font-lock-constant-face prepend))
         (,(rx "\\\\" (or (seq "<" (group-n 1 lisp-mode-symbol) ">")
                          (seq "{" (group-n 1 lisp-mode-symbol) "}")))
          (1 font-lock-variable-name-face prepend))
         ;; Ineffective backslashes (typically in need of doubling).
         ("\\(\\\\\\)\\([^\"\\]\\)"
          (1 (elisp--font-lock-backslash) prepend))
         ;; Words inside ‘’, '' and `' tend to be symbol names.
         (,(concat "[`‘']\\(" (rx lisp-mode-symbol) "\\)['’]")
          (1 font-lock-constant-face prepend))
         ;; \\= tends to be an escape in doc strings.
         (,(rx "\\\\=")
          (0 font-lock-builtin-face prepend))
         ;; Constant values.
         (,(lambda (bound) (lisp-mode--search-key ":" bound))
          (0 font-lock-builtin-face))
         ;; ELisp and CLisp `&' keywords as types.
         (,(lambda (bound) (lisp-mode--search-key "&" bound))
          (0 font-lock-type-face))
         ;; ELisp regexp grouping constructs
         (,(lambda (bound)
             (catch 'found
               ;; The following loop is needed to continue searching after matches
               ;; that do not occur in strings.  The associated regexp matches one
               ;; of `\\\\' `\\(' `\\(?:' `\\|' `\\)'.  `\\\\' has been included to
               ;; avoid highlighting, for example, `\\(' in `\\\\('.
               (while (re-search-forward "\\(\\\\\\\\\\)\\(?:\\(\\\\\\\\\\)\\|\\((\\(?:\\?[0-9]*:\\)?\\|[|)]\\)\\)" bound t)
                 (unless (match-beginning 2)
                   (let ((face (get-text-property (1- (point)) 'face)))
                     (when (or (and (listp face)
                                    (memq 'font-lock-string-face face))
                               (eq 'font-lock-string-face face))
                       (throw 'found t)))))))
           (1 'font-lock-regexp-grouping-backslash prepend)
           (3 'font-lock-regexp-grouping-construct prepend))
         (lisp--match-hidden-arg
          (0 '(face font-lock-warning-face
               help-echo "Easy to misread; consider moving the element to the next line")
             prepend))
         (lisp--match-confusable-symbol-character
          0 '(face font-lock-warning-face
                    help-echo "Confusable character"))
         ))
      "Gaudy level highlighting for Emacs Lisp mode.")

    (defconst lisp-cl-font-lock-keywords-2
      (append
       lisp-cl-font-lock-keywords-1
       `( ;; Regexp negated char group.
         ("\\[\\(\\^\\)" 1 font-lock-negation-char-face prepend)
         ;; Control structures.  Common Lisp forms.
         (,(concat "(" cl-kws-re "\\_>") . 1)
         ;; Exit/Feature symbols as constants.
         (,(concat "(\\(catch\\|throw\\|provide\\|require\\)\\_>"
                   "[ \t']*\\(" (rx lisp-mode-symbol) "\\)?")
           (1 font-lock-keyword-face)
           (2 font-lock-constant-face nil t))
         ;; Erroneous structures.
         (,(concat "(" cl-errs-re "\\_>")
           (1 font-lock-warning-face))
         ;; Words inside ‘’ and `' tend to be symbol names.
         (,(concat "[`‘]\\(" (rx lisp-mode-symbol) "\\)['’]")
          (1 font-lock-constant-face prepend))
         ;; Uninterned symbols, e.g., (defpackage #:my-package ...)
         ;; must come before keywords below to have effect
         (,(concat "#:" (rx lisp-mode-symbol) "") 0 font-lock-builtin-face)
         ;; Constant values.
         (,(lambda (bound) (lisp-mode--search-key ":" bound))
          (0 font-lock-builtin-face))
         ;; ELisp and CLisp `&' keywords as types.
         (,(lambda (bound) (lisp-mode--search-key "&" bound))
          (0 font-lock-type-face))
         ;; ELisp regexp grouping constructs
         ;; This is too general -- rms.
         ;; A user complained that he has functions whose names start with `do'
         ;; and that they get the wrong color.
         ;; That user has violated the https://www.cliki.net/Naming+conventions:
         ;; CL (but not EL!) `with-' (context) and `do-' (iteration)
         (,(concat "(\\(\\(do-\\|with-\\)" (rx lisp-mode-symbol) "\\)")
           (1 font-lock-keyword-face))
         (lisp--match-hidden-arg
          (0 '(face font-lock-warning-face
               help-echo "Easy to misread; consider moving the element to the next line")
             prepend))
         ))
      "Gaudy level highlighting for Lisp modes.")))

(define-obsolete-variable-alias 'lisp-font-lock-keywords
  'lisp-el-font-lock-keywords "24.4")
(defvar lisp-el-font-lock-keywords lisp-el-font-lock-keywords-1
  "Default expressions to highlight in Emacs Lisp mode.")
(defvar lisp-cl-font-lock-keywords lisp-cl-font-lock-keywords-1
  "Default expressions to highlight in Lisp modes.")

;; Support backtrace mode.
(defconst lisp-el-font-lock-keywords-for-backtraces lisp-el-font-lock-keywords
  "Default highlighting from Emacs Lisp mode used in Backtrace mode.")
(defconst lisp-el-font-lock-keywords-for-backtraces-1 lisp-el-font-lock-keywords-1
  "Subdued highlighting from Emacs Lisp mode used in Backtrace mode.")
(defconst lisp-el-font-lock-keywords-for-backtraces-2
  (remove (assoc 'lisp--match-hidden-arg lisp-el-font-lock-keywords-2)
          lisp-el-font-lock-keywords-2)
  "Gaudy highlighting from Emacs Lisp mode used in Backtrace mode.")

(defun lisp-string-in-doc-position-p (listbeg startpos)
  "Return non-nil if a doc string may occur at STARTPOS inside a list.
LISTBEG is the position of the start of the innermost list
containing STARTPOS."
  (let* ((firstsym (and listbeg
                        (save-excursion
                          (goto-char listbeg)
                          (and (looking-at
                                (concat "([ \t\n]*\\("
                                        (rx lisp-mode-symbol) "\\)"))
                               (match-string 1)))))
         (docelt (and firstsym
                      (function-get (intern-soft firstsym)
                                    lisp-doc-string-elt-property))))
    (and docelt
         ;; It's a string in a form that can have a docstring.
         ;; Check whether it's in docstring position.
         (save-excursion
           (when (functionp docelt)
             (goto-char (match-end 1))
             (setq docelt (funcall docelt)))
           (goto-char listbeg)
           (forward-char 1)
           (condition-case nil
               (while (and (> docelt 0) (< (point) startpos)
                           (progn (forward-sexp 1) t))
                 (setq docelt (1- docelt)))
             (error nil))
           (and (zerop docelt) (<= (point) startpos)
                (progn (forward-comment (point-max)) t)
                (= (point) startpos))))))

(defun lisp-string-after-doc-keyword-p (listbeg startpos)
  "Return non-nil if `:documentation' symbol ends at STARTPOS inside a list.
`:doc' can also be used.

LISTBEG is the position of the start of the innermost list
containing STARTPOS."
  (and listbeg                          ; We are inside a Lisp form.
       (save-excursion
         (goto-char startpos)
         (ignore-errors
           (progn (backward-sexp 1)
                  (looking-at ":documentation\\_>\\|:doc\\_>"))))))

(defun lisp-font-lock-syntactic-face-function (state)
  "Return syntactic face function for the position represented by STATE.
STATE is a `parse-partial-sexp' state, and the returned function is the
Lisp font lock syntactic face function."
  (if (nth 3 state)
      ;; This might be a (doc)string or a |...| symbol.
      (let ((startpos (nth 8 state)))
        (if (eq (char-after startpos) ?|)
            ;; This is not a string, but a |...| symbol.
            nil
          (let ((listbeg (nth 1 state)))
            (if (or (lisp-string-in-doc-position-p listbeg startpos)
                    (lisp-string-after-doc-keyword-p listbeg startpos))
                font-lock-doc-face
              font-lock-string-face))))
    font-lock-comment-face))

(defun lisp-adaptive-fill ()
  "Return fill prefix found at point.
Value for `adaptive-fill-function'."
  ;; Adaptive fill mode gets the fill wrong for a one-line paragraph made of
  ;; a single docstring.  Let's fix it here.
  (if (looking-at "\\s-+\"[^\n\"]+\"\\s-*$") ""))

;; Maybe this should be discouraged/obsoleted and users should be
;; encouraged to use 'lisp-data-mode' instead.
(defun lisp-mode-variables (&optional lisp-syntax keywords-case-insensitive
                                      elisp)
  "Common initialization routine for Lisp modes.
The LISP-SYNTAX argument is used by code in inf-lisp.el and is
\(uselessly) passed from pp.el, chistory.el, gnus-kill.el and
score-mode.el.  KEYWORDS-CASE-INSENSITIVE non-nil means that for
font-lock keywords will not be case sensitive."
  (when lisp-syntax
    (set-syntax-table lisp-mode-syntax-table))
  (setq-local paragraph-ignore-fill-prefix t)
  (setq-local fill-paragraph-function 'lisp-fill-paragraph)
  (setq-local adaptive-fill-function #'lisp-adaptive-fill)
  ;; Adaptive fill mode gets in the way of auto-fill,
  ;; and should make no difference for explicit fill
  ;; because lisp-fill-paragraph should do the job.
  ;;  I believe that newcomment's auto-fill code properly deals with it  -stef
  ;;(setq-local adaptive-fill-mode nil)
  (setq-local indent-line-function 'lisp-indent-line)
  (setq-local indent-region-function 'lisp-indent-region)
  (setq-local comment-indent-function #'lisp-comment-indent)
  (setq-local outline-regexp (concat ";;;;* [^ \t\n]\\|(\\|\\("
                                     lisp-mode-autoload-regexp
                                     "\\)"))
  (setq-local outline-level 'lisp-outline-level)
  (setq-local add-log-current-defun-function #'lisp-current-defun-name)
  (setq-local comment-start ";")
  (setq-local comment-start-skip ";+ *")
  (setq-local comment-add 1)		;default to `;;' in comment-region
  (setq-local comment-column 40)
  (setq-local comment-use-syntax t)
  (setq-local imenu-generic-expression lisp-imenu-generic-expression)
  (setq-local multibyte-syntax-as-symbol t)
  ;; (setq-local syntax-begin-function 'beginning-of-defun)  ;;Bug#16247.
  (setq font-lock-defaults
	`(,(if elisp '(lisp-el-font-lock-keywords
                       lisp-el-font-lock-keywords-1
                       lisp-el-font-lock-keywords-2)
             '(lisp-cl-font-lock-keywords
               lisp-cl-font-lock-keywords-1
               lisp-cl-font-lock-keywords-2))
	  nil ,keywords-case-insensitive nil nil
	  (font-lock-mark-block-function . mark-defun)
          (font-lock-extra-managed-props help-echo)
	  (font-lock-syntactic-face-function
	   . lisp-font-lock-syntactic-face-function)))
  (setq-local prettify-symbols-alist lisp-prettify-symbols-alist)
  (setq-local electric-pair-skip-whitespace 'chomp)
  (setq-local electric-pair-open-newline-between-pairs nil))

;;;###autoload
(define-derived-mode lisp-data-mode prog-mode "Lisp-Data"
  "Major mode for buffers holding data written in Lisp syntax."
  :group 'lisp
  (lisp-mode-variables nil t nil)
  (setq-local electric-quote-string t)
  (setq imenu-case-fold-search nil))

(defun lisp-outline-level ()
  "Lisp mode `outline-level' function."
  ;; Expects outline-regexp is ";;;\\(;* [^ \t\n]\\|###autoload\\)\\|("
  ;; and point is at the beginning of a matching line.
  (let ((len (- (match-end 0) (match-beginning 0))))
    (cond ((or (looking-at-p "(")
               (looking-at-p lisp-mode-autoload-regexp))
           1000)
          ((looking-at ";;\\(;+\\) ")
           (- (match-end 1) (match-beginning 1)))
          ;; Above should match everything but just in case.
          (t
           len))))

(defun lisp-current-defun-name ()
  "Return the name of the defun at point, or nil."
  (save-excursion
    (let ((location (point)))
      ;; If we are now precisely at the beginning of a defun, make sure
      ;; beginning-of-defun finds that one rather than the previous one.
      (or (eobp) (forward-char 1))
      (beginning-of-defun)
      ;; Make sure we are really inside the defun found, not after it.
      (when (and (looking-at "\\s(")
		 (progn (end-of-defun)
			(< location (point)))
		 (progn (forward-sexp -1)
			(>= location (point))))
	(if (looking-at "\\s(")
	    (forward-char 1))
	;; Skip the defining construct name, typically "defun" or
	;; "defvar".
	(forward-sexp 1)
	;; The second element is usually a symbol being defined.  If it
	;; is not, use the first symbol in it.
	(skip-chars-forward " \t\n'(")
	(buffer-substring-no-properties (point)
					(progn (forward-sexp 1)
					       (point)))))))

(defvar-keymap lisp-mode-shared-map
  :doc "Keymap for commands shared by all sorts of Lisp modes."
  :parent prog-mode-map
  "C-M-q" #'indent-sexp
  "DEL"   #'backward-delete-char-untabify
  ;; This gets in the way when viewing a Lisp file in view-mode.  As
  ;; long as [backspace] is mapped into DEL via the
  ;; function-key-map, this should remain disabled!!
  ;;;"<backspace>" #'backward-delete-char-untabify
  )

(defcustom lisp-mode-hook nil
  "Hook run when entering Lisp mode."
  :options '(imenu-add-menubar-index)
  :type 'hook
  :group 'lisp)

(defcustom lisp-interaction-mode-hook nil
  "Hook run when entering Lisp Interaction mode."
  :options '(eldoc-mode)
  :type 'hook
  :group 'lisp)

;;; Generic Lisp mode.

(defvar-keymap lisp-mode-map
  :doc "Keymap for ordinary Lisp mode.
All commands in `lisp-mode-shared-map' are inherited by this map."
  :parent lisp-mode-shared-map
  "C-M-x"   #'lisp-eval-defun
  "C-c C-z" #'run-lisp)

(easy-menu-define lisp-mode-menu lisp-mode-map
  "Menu for ordinary Lisp mode."
  '("Lisp"
    ["Indent sexp" indent-sexp
     :help "Indent each line of the list starting just after point"]
    ["Eval defun" lisp-eval-defun
     :help "Send the current defun to the Lisp process made by M-x run-lisp"]
    ["Run inferior Lisp" run-lisp
     :help "Run an inferior Lisp process, input and output via buffer `*inferior-lisp*'"]))

(define-derived-mode lisp-mode lisp-data-mode "Lisp"
  "Major mode for editing programs in Common Lisp and other similar Lisps.
Commands:
Delete converts tabs to spaces as it moves back.
Blank lines separate paragraphs.  Semicolons start comments.

\\{lisp-mode-map}
Note that `run-lisp' may be used either to start an inferior Lisp job
or to switch back to an existing one."
  (setq-local lisp-indent-function 'common-lisp-indent-function)
  (setq-local find-tag-default-function 'lisp-find-tag-default)
  (setq-local comment-start-skip
	      "\\(\\(^\\|[^\\\n]\\)\\(\\\\\\\\\\)*\\)\\(;+\\|#|\\) *")
  (setq-local comment-end-skip "[ \t]*\\(\\s>\\||#\\)")
  (setq-local font-lock-comment-end-skip "|#")
  (setq imenu-case-fold-search t))

(defun lisp-find-tag-default ()
  (let ((default (find-tag-default)))
    (when (stringp default)
      (if (string-match ":+" default)
          (substring default (match-end 0))
	default))))

;; Used in old LispM code.
(defalias 'common-lisp-mode 'lisp-mode)

(autoload 'lisp-eval-defun "inf-lisp" nil t)

(defun lisp-comment-indent ()
  "Like `comment-indent-default', but don't put space after open paren."
  (or (when (looking-at "\\s<\\s<")
        (let ((pt (point)))
          (skip-syntax-backward " ")
          (if (eq (preceding-char) ?\()
              (cons (current-column) (current-column))
            (goto-char pt)
            nil)))
      (comment-indent-default)))

(defcustom lisp-indent-offset nil
  "If non-nil, indent second line of expressions that many more columns."
  :group 'lisp
  :type '(choice (const nil) integer)
  :safe (lambda (x) (or (null x) (integerp x))))

(defcustom lisp-indent-function 'lisp-indent-function
  "A function to be called by `calculate-lisp-indent'.
It indents the arguments of a Lisp function call.  This function
should accept two arguments: the indent-point, and the
`parse-partial-sexp' state at that position.  One option for this
function is `common-lisp-indent-function'."
  :type 'function
  :group 'lisp)

(defun lisp-ppss (&optional pos)
  "Return Parse-Partial-Sexp State at POS, defaulting to point.
Like `syntax-ppss' but includes the character address of the last
complete sexp in the innermost containing list at position
2 (counting from 0).  This is important for Lisp indentation."
  (unless pos (setq pos (point)))
  (let ((pss (syntax-ppss pos)))
    (if (nth 9 pss)
        (let ((sexp-start (car (last (nth 9 pss)))))
          (parse-partial-sexp sexp-start pos nil nil (syntax-ppss sexp-start)))
      pss)))

(cl-defstruct (lisp-indent-state
               (:constructor nil)
               (:constructor lisp-indent-initial-state
                             (&aux (ppss (lisp-ppss))
                                   (ppss-point (point))
                                   (stack (make-list (1+ (car ppss)) nil)))))
  stack ;; Cached indentation, per depth.
  ppss
  ppss-point)

(defun lisp-indent-calc-next (state)
  "Move to next line and return calculated indent for it.
STATE is updated by side effect, the first state should be
created by `lisp-indent-initial-state'.  This function may move
by more than one line to cross a string literal."
  (pcase-let* (((cl-struct lisp-indent-state
                           (stack indent-stack) ppss ppss-point)
                state)
               (indent-depth (car ppss)) ; Corresponding to indent-stack.
               (depth indent-depth))
    ;; Parse this line so we can learn the state to indent the
    ;; next line.
    (while (let ((last-sexp (nth 2 ppss)))
             (setq ppss (parse-partial-sexp
                         ppss-point (progn (end-of-line) (point))
                         nil nil ppss))
             ;; Preserve last sexp of state (position 2) for
             ;; `calculate-lisp-indent', if we're at the same depth.
             (if (and (not (nth 2 ppss)) (= depth (car ppss)))
                 (setf (nth 2 ppss) last-sexp)
               (setq last-sexp (nth 2 ppss)))
             (setq depth (car ppss))
             ;; Skip over newlines within strings.
             (and (not (eobp)) (nth 3 ppss)))
      (let ((string-start (nth 8 ppss)))
        (setq ppss (parse-partial-sexp (point) (point-max)
                                       nil nil ppss 'syntax-table))
        (setf (nth 2 ppss) string-start) ; Finished a complete string.
        (setq depth (car ppss)))
      (setq ppss-point (point)))
    (setq ppss-point (point))
    (let* ((depth-delta (- depth indent-depth)))
      (cond ((< depth-delta 0)
             (setq indent-stack (nthcdr (- depth-delta) indent-stack)))
            ((> depth-delta 0)
             (setq indent-stack (nconc (make-list depth-delta nil)
                                       indent-stack)))))
    (prog1
        (let (indent)
          (cond ((= (forward-line 1) 1)
                 ;; Can't move to the next line, apparently end of buffer.
                 nil)
                ((null indent-stack)
                 ;; Negative depth, probably some kind of syntax
                 ;; error.  Reset the state.
                 (setq ppss (parse-partial-sexp (point) (point))))
                ((car indent-stack))
                ((integerp (setq indent (calculate-lisp-indent ppss)))
                 (setf (car indent-stack) indent))
                ((consp indent)       ; (COLUMN CONTAINING-SEXP-START)
                 (car indent))
                ;; This only happens if we're in a string, but the
                ;; loop should always skip over strings (unless we hit
                ;; end of buffer, which is taken care of by the first
                ;; clause).
                (t (error "This shouldn't happen"))))
      (setf (lisp-indent-state-stack state) indent-stack)
      (setf (lisp-indent-state-ppss-point state) ppss-point)
      (setf (lisp-indent-state-ppss state) ppss))))

(defun lisp-indent-region (start end)
  "Indent region as Lisp code, efficiently."
  (save-excursion
    (setq end (copy-marker end))
    (goto-char start)
    (beginning-of-line)
    ;; The default `indent-region-line-by-line' doesn't hold a running
    ;; parse state, which forces each indent call to reparse from the
    ;; beginning.  That has O(n^2) complexity.
    (let* ((parse-state (lisp-indent-initial-state))
           (pr (unless (minibufferp)
                 (make-progress-reporter "Indenting region..." (point) end))))
      (let ((ppss (lisp-indent-state-ppss parse-state)))
        (unless (or (and (bolp) (eolp)) (nth 3 ppss))
          (lisp-indent-line (calculate-lisp-indent ppss))))
      (let ((indent nil))
        (while (progn (setq indent (lisp-indent-calc-next parse-state))
                      (< (point) end))
          (unless (or (and (bolp) (eolp)) (not indent))
            (lisp-indent-line indent))
          (and pr (progress-reporter-update pr (point)))))
      (and pr (progress-reporter-done pr))
      (move-marker end nil))))

(defun lisp-indent-line (&optional indent)
  "Indent current line as Lisp code."
  (interactive)
  (let ((pos (- (point-max) (point)))
        (indent (progn (beginning-of-line)
                       (or indent (calculate-lisp-indent (lisp-ppss))))))
    (skip-chars-forward " \t")
    (if (or (null indent) (looking-at "\\s<\\s<\\s<"))
	;; Don't alter indentation of a ;;; comment line
	;; or a line that starts in a string.
        ;; FIXME: inconsistency: comment-indent moves ;;; to column 0.
	(goto-char (- (point-max) pos))
      (if (and (looking-at "\\s<") (not (looking-at "\\s<\\s<")))
	  ;; Single-semicolon comment lines should be indented
	  ;; as comment lines, not as code.
	  (progn (indent-for-comment) (forward-char -1))
	(if (listp indent) (setq indent (car indent)))
        (indent-line-to indent))
      ;; If initial point was within line's indentation,
      ;; position after the indentation.  Else stay at same point in text.
      (if (> (- (point-max) pos) (point))
	  (goto-char (- (point-max) pos))))))

(defvar calculate-lisp-indent-last-sexp)

(defun calculate-lisp-indent (&optional parse-start)
  "Return appropriate indentation for current line as Lisp code.
In usual case returns an integer: the column to indent to.
If the value is nil, that means don't change the indentation
because the line starts inside a string.

PARSE-START may be a buffer position to start parsing from, or a
parse state as returned by calling `parse-partial-sexp' up to the
beginning of the current line.

The value can also be a list of the form (COLUMN CONTAINING-SEXP-START).
This means that following lines at the same level of indentation
should not necessarily be indented the same as this line.
Then COLUMN is the column to indent to, and CONTAINING-SEXP-START
is the buffer position of the start of the containing expression."
  (save-excursion
    (beginning-of-line)
    (let ((indent-point (point))
          state
          ;; setting this to a number inhibits calling hook
          (desired-indent nil)
          (retry t)
          whitespace-after-open-paren
          calculate-lisp-indent-last-sexp containing-sexp)
      (cond ((or (markerp parse-start) (integerp parse-start))
             (goto-char parse-start))
            ((null parse-start) (beginning-of-defun))
            (t (setq state parse-start)))
      (unless state
        ;; Find outermost containing sexp
        (while (< (point) indent-point)
          (setq state (parse-partial-sexp (point) indent-point 0))))
      ;; Find innermost containing sexp
      (while (and retry
		  state
                  (> (elt state 0) 0))
        (setq retry nil)
        (setq calculate-lisp-indent-last-sexp (elt state 2))
        (setq containing-sexp (elt state 1))
        ;; Position following last unclosed open.
        (goto-char (1+ containing-sexp))
        ;; Is there a complete sexp since then?
        (if (and calculate-lisp-indent-last-sexp
		 (> calculate-lisp-indent-last-sexp (point)))
            ;; Yes, but is there a containing sexp after that?
            (let ((peek (parse-partial-sexp calculate-lisp-indent-last-sexp
					    indent-point 0)))
              (if (setq retry (car (cdr peek))) (setq state peek)))))
      (if retry
          nil
        ;; Innermost containing sexp found
        (goto-char (1+ containing-sexp))
        (setq whitespace-after-open-paren (looking-at (rx whitespace)))
        (if (not calculate-lisp-indent-last-sexp)
	    ;; indent-point immediately follows open paren.
	    ;; Don't call hook.
            (setq desired-indent (current-column))
	  ;; Find the start of first element of containing sexp.
	  (parse-partial-sexp (point) calculate-lisp-indent-last-sexp 0 t)
	  (cond ((looking-at "\\s(")
		 ;; First element of containing sexp is a list.
		 ;; Indent under that list.
		 )
		((> (save-excursion (forward-line 1) (point))
		    calculate-lisp-indent-last-sexp)
		 ;; This is the first line to start within the containing sexp.
		 ;; It's almost certainly a function call.
		 (if (or (= (point) calculate-lisp-indent-last-sexp)
                         whitespace-after-open-paren)
		     ;; Containing sexp has nothing before this line
		     ;; except the first element, or the first element is
                     ;; preceded by whitespace.  Indent under that element.
		     nil
		   ;; Skip the first element, find start of second (the first
		   ;; argument of the function call) and indent under.
		   (progn (forward-sexp 1)
			  (parse-partial-sexp (point)
					      calculate-lisp-indent-last-sexp
					      0 t)))
		 (backward-prefix-chars))
		(t
		 ;; Indent beneath first sexp on same line as
		 ;; `calculate-lisp-indent-last-sexp'.  Again, it's
		 ;; almost certainly a function call.
		 (goto-char calculate-lisp-indent-last-sexp)
		 (beginning-of-line)
		 (parse-partial-sexp (point) calculate-lisp-indent-last-sexp
				     0 t)
		 (backward-prefix-chars)))))
      ;; Point is at the point to indent under unless we are inside a string.
      ;; Call indentation hook except when overridden by lisp-indent-offset
      ;; or if the desired indentation has already been computed.
      (let ((normal-indent (current-column)))
        (cond ((elt state 3)
               ;; Inside a string, don't change indentation.
	       nil)
              ((and (integerp lisp-indent-offset) containing-sexp)
               ;; Indent by constant offset
               (goto-char containing-sexp)
               (+ (current-column) lisp-indent-offset))
              ;; in this case calculate-lisp-indent-last-sexp is not nil
              (calculate-lisp-indent-last-sexp
               (or
                ;; try to align the parameters of a known function
                (and lisp-indent-function
                     (not retry)
                     (funcall lisp-indent-function indent-point state))
                ;; If the function has no special alignment
		;; or it does not apply to this argument,
		;; try to align a constant-symbol under the last
                ;; preceding constant symbol, if there is such one of
                ;; the last 2 preceding symbols, in the previous
                ;; uncommented line.
                (and (save-excursion
                       (goto-char indent-point)
                       (skip-chars-forward " \t")
                       (looking-at ":"))
                     ;; The last sexp may not be at the indentation
                     ;; where it begins, so find that one, instead.
                     (save-excursion
                       (goto-char calculate-lisp-indent-last-sexp)
		       ;; Handle prefix characters and whitespace
		       ;; following an open paren.  (Bug#1012)
                       (backward-prefix-chars)
                       (while (not (save-excursion
                                     (skip-chars-backward " \t")
                                     (or (= (point) (line-beginning-position))
                                         (and containing-sexp
                                              (= (point) (1+ containing-sexp))))))
                         (forward-sexp -1)
                         (backward-prefix-chars))
                       (setq calculate-lisp-indent-last-sexp (point)))
                     (> calculate-lisp-indent-last-sexp
                        (save-excursion
                          (goto-char (1+ containing-sexp))
                          (parse-partial-sexp (point) calculate-lisp-indent-last-sexp 0 t)
                          (point)))
                     (let ((parse-sexp-ignore-comments t)
                           indent)
                       (goto-char calculate-lisp-indent-last-sexp)
                       (or (and (looking-at ":")
                                (setq indent (current-column)))
                           (and (< (line-beginning-position)
                                   (prog2 (backward-sexp) (point)))
                                (looking-at ":")
                                (setq indent (current-column))))
                       indent))
                ;; another symbols or constants not preceded by a constant
                ;; as defined above.
                normal-indent))
              ;; in this case calculate-lisp-indent-last-sexp is nil
              (desired-indent)
              (t
               normal-indent))))))

(defun lisp--local-defform-body-p (state)
  "Return non-nil when at local definition body according to STATE.
STATE is the `parse-partial-sexp' state for current position."
  (when-let ((start-of-innermost-containing-list (nth 1 state)))
    (let* ((parents (nth 9 state))
           (first-cons-after (cdr parents))
           (second-cons-after (cdr first-cons-after))
           first-order-parent second-order-parent)
      (while second-cons-after
        (when (= start-of-innermost-containing-list
                 (car second-cons-after))
          (setq second-order-parent (pop parents)
                first-order-parent (pop parents)
                ;; Leave the loop.
                second-cons-after nil))
        (pop second-cons-after)
        (pop parents))
      (when second-order-parent
        (let (local-definitions-starting-point)
          (and (save-excursion
                 (goto-char (1+ second-order-parent))
                 (when-let ((head (ignore-errors
                                    ;; FIXME: This does not distinguish
                                    ;; between reading nil and a read error.
                                    ;; We don't care but still, better fix this.
                                    (read (current-buffer)))))
                   (when (memq head '( cl-flet cl-labels cl-macrolet cl-flet*
                                       cl-symbol-macrolet))
                     ;; In what follows, we rely on (point) returning non-nil.
                     (setq local-definitions-starting-point
                           (progn
                             (parse-partial-sexp
                              (point) first-order-parent nil
                              ;; From docstring of `parse-partial-sexp':
                              ;; Fourth arg non-nil means stop
                              ;; when we come to any character
                              ;; that starts a sexp.
                              t)
                             (point))))))
               (save-excursion
                 (when (ignore-errors
                         ;; We rely on `backward-up-list' working
                         ;; even when sexp is incomplete “to the right”.
                         (backward-up-list 2)
                         t)
                   (= local-definitions-starting-point (point))))))))))

(defun lisp-indent-function (indent-point state)
  "This function is the normal value of the variable `lisp-indent-function'.
The function `calculate-lisp-indent' calls this to determine
if the arguments of a Lisp function call should be indented specially.

INDENT-POINT is the position at which the line being indented begins.
Point is located at the point to indent under (for default indentation);
STATE is the `parse-partial-sexp' state for that position.

If the current line is in a call to a Lisp function that has a non-nil
property `lisp-indent-function' (or the deprecated `lisp-indent-hook'),
it specifies how to indent.  The property value can be:

* `defun', meaning indent `defun'-style
  (this is also the case if there is no property and the function
  has a name that begins with \"def\", and three or more arguments);

* an integer N, meaning indent the first N arguments specially
  (like ordinary function arguments), and then indent any further
  arguments like a body;

* a function to call that returns the indentation (or nil).
  `lisp-indent-function' calls this function with the same two arguments
  that it itself received.

This function returns either the indentation to use, or nil if the
Lisp function does not specify a special indentation."
  (let ((normal-indent (current-column)))
    (goto-char (1+ (elt state 1)))
    (parse-partial-sexp (point) calculate-lisp-indent-last-sexp 0 t)
    (if (and (elt state 2)
             (not (looking-at "\\sw\\|\\s_")))
        ;; car of form doesn't seem to be a symbol
        (if (lisp--local-defform-body-p state)
            ;; We nevertheless check whether we are in flet-like form
            ;; as we presume local function names could be non-symbols.
            (lisp-indent-defform state indent-point)
          (if (not (> (save-excursion (forward-line 1) (point))
                      calculate-lisp-indent-last-sexp))
	      (progn (goto-char calculate-lisp-indent-last-sexp)
		     (beginning-of-line)
		     (parse-partial-sexp (point)
					 calculate-lisp-indent-last-sexp 0 t)))
	  ;; Indent under the list or under the first sexp on the same
	  ;; line as calculate-lisp-indent-last-sexp.  Note that first
	  ;; thing on that line has to be complete sexp since we are
          ;; inside the innermost containing sexp.
          (backward-prefix-chars)
          (current-column))
      (let ((function (buffer-substring (point)
					(progn (forward-sexp 1) (point))))
	    method)
	(setq method (or (function-get (intern-soft function)
                                       'lisp-indent-function)
			 (get (intern-soft function) 'lisp-indent-hook)))
	(cond ((or (eq method 'defun)
                   ;; Check whether we are in flet-like form.
                   (lisp--local-defform-body-p state))
	       (lisp-indent-defform state indent-point))
	      ((integerp method)
	       (lisp-indent-specform method state
				     indent-point normal-indent))
	      (method
	       (funcall method indent-point state)))))))

(defcustom lisp-body-indent 2
  "Number of columns to indent the second line of a `(def...)' form."
  :group 'lisp
  :type 'integer
  :safe #'integerp)

(defun lisp-indent-specform (count state indent-point normal-indent)
  (let ((containing-form-start (elt state 1))
        (i count)
        body-indent containing-form-column)
    ;; Move to the start of containing form, calculate indentation
    ;; to use for non-distinguished forms (> count), and move past the
    ;; function symbol.  lisp-indent-function guarantees that there is at
    ;; least one word or symbol character following open paren of containing
    ;; form.
    (goto-char containing-form-start)
    (setq containing-form-column (current-column))
    (setq body-indent (+ lisp-body-indent containing-form-column))
    (forward-char 1)
    (forward-sexp 1)
    ;; Now find the start of the last form.
    (parse-partial-sexp (point) indent-point 1 t)
    (while (and (< (point) indent-point)
                (condition-case ()
                    (progn
                      (setq count (1- count))
                      (forward-sexp 1)
                      (parse-partial-sexp (point) indent-point 1 t))
                  (error nil))))
    ;; Point is sitting on first character of last (or count) sexp.
    (if (> count 0)
        ;; A distinguished form.  If it is the first or second form use double
        ;; lisp-body-indent, else normal indent.  With lisp-body-indent bound
        ;; to 2 (the default), this just happens to work the same with if as
        ;; the older code, but it makes unwind-protect, condition-case,
        ;; with-output-to-temp-buffer, et. al. much more tasteful.  The older,
        ;; less hacked, behavior can be obtained by replacing below with
        ;; (list normal-indent containing-form-start).
        (if (<= (- i count) 1)
            (list (+ containing-form-column (* 2 lisp-body-indent))
                  containing-form-start)
            (list normal-indent containing-form-start))
      ;; A non-distinguished form.  Use body-indent if there are no
      ;; distinguished forms and this is the first undistinguished form,
      ;; or if this is the first undistinguished form and the preceding
      ;; distinguished form has indentation at least as great as body-indent.
      (if (or (and (= i 0) (= count 0))
              (and (= count 0) (<= body-indent normal-indent)))
          body-indent
          normal-indent))))

(defun lisp-indent-defform (state _indent-point)
  (goto-char (car (cdr state)))
  (forward-line 1)
  (if (> (point) (car (cdr (cdr state))))
      (progn
	(goto-char (car (cdr state)))
	(+ lisp-body-indent (current-column)))))


;; (put 'progn 'lisp-indent-function 0), say, causes progn to be indented
;; like defun if the first form is placed on the next line, otherwise
;; it is indented like any other form (i.e. forms line up under first).

(put 'autoload 'lisp-indent-function 'defun) ;Elisp
(put 'progn 'lisp-indent-function 0)
(put 'defvar 'lisp-indent-function 'defun)
(put 'defalias 'lisp-indent-function 'defun)
(put 'defvaralias 'lisp-indent-function 'defun)
(put 'defconst 'lisp-indent-function 'defun)
(put 'define-category 'lisp-indent-function 'defun)
(put 'define-charset-internal 'lisp-indent-function 'defun)
(put 'define-fringe-bitmap 'lisp-indent-function 'defun)
(put 'prog1 'lisp-indent-function 1)
(put 'save-excursion 'lisp-indent-function 0)      ;Elisp
(put 'save-restriction 'lisp-indent-function 0)    ;Elisp
(put 'save-current-buffer 'lisp-indent-function 0) ;Elisp
(put 'let 'lisp-indent-function 1)
(put 'let* 'lisp-indent-function 1)
(put 'while 'lisp-indent-function 1)
(put 'if 'lisp-indent-function 2)
(put 'catch 'lisp-indent-function 1)
(put 'condition-case 'lisp-indent-function 2)
(put 'handler-case 'lisp-indent-function 1) ;CL
(put 'handler-bind 'lisp-indent-function 1) ;CL
(put 'unwind-protect 'lisp-indent-function 1)
(put 'with-output-to-temp-buffer 'lisp-indent-function 1)
(put 'closure 'lisp-indent-function 2)

(defun indent-sexp (&optional endpos)
  "Indent each line of the list starting just after point.
If optional arg ENDPOS is given, indent each line, stopping when
ENDPOS is encountered."
  (interactive)
  (let* ((parse-state (lisp-indent-initial-state)))
    ;; We need a marker because we modify the buffer
    ;; text preceding endpos.
    (setq endpos (copy-marker
                  (if endpos endpos
                    ;; Get error now if we don't have a complete sexp
                    ;; after point.
                    (save-excursion
                      (forward-sexp 1)
                      (let ((eol (line-end-position)))
                        ;; We actually look for a sexp which ends
                        ;; after the current line so that we properly
                        ;; indent things like #s(...).  This might not
                        ;; be needed if Bug#15998 is fixed.
                        (when (and (< (point) eol)
                                   ;; Check if eol is within a sexp.
                                   (> (nth 0 (save-excursion
                                               (parse-partial-sexp
                                                (point) eol)))
                                      0))
                          (condition-case ()
                              (while (< (point) eol)
                                (forward-sexp 1))
                            ;; But don't signal an error for incomplete
                            ;; sexps following the first complete sexp
                            ;; after point.
                            (scan-error nil))))
                      (point)))))
    (save-excursion
      (while (let ((indent (lisp-indent-calc-next parse-state))
                   (ppss (lisp-indent-state-ppss parse-state)))
               ;; If the line contains a comment indent it now with
               ;; `indent-for-comment'.
               (when (and (nth 4 ppss) (<= (nth 8 ppss) endpos))
                 (save-excursion
                   (goto-char (lisp-indent-state-ppss-point parse-state))
                   (indent-for-comment)
                   (setf (lisp-indent-state-ppss-point parse-state)
                         (line-end-position))))
               (when (< (point) endpos)
                 ;; Indent the next line, unless it's blank, or just a
                 ;; comment (we will `indent-for-comment' the latter).
                 (skip-chars-forward " \t")
                 (unless (or (eolp) (not indent)
                             (eq (char-syntax (char-after)) ?<))
                   (indent-line-to indent))
                 t))))
    (move-marker endpos nil)))

(defun indent-pp-sexp (&optional arg)
  "Indent each line of the list starting just after point, or prettyprint it.
A prefix argument specifies pretty-printing."
  (interactive "P")
  (if arg
      (save-excursion
        (save-restriction
          (narrow-to-region (point) (progn (forward-sexp 1) (point)))
          (pp-buffer)
          (goto-char (point-max))
          (if (eq (char-before) ?\n)
              (delete-char -1)))))
  (indent-sexp))

;;;; Lisp paragraph filling commands.

(defcustom emacs-lisp-docstring-fill-column 65
  "Value of `fill-column' to use when filling a docstring.
Any non-integer value means do not use a different value of
`fill-column' when filling docstrings."
  :type '(choice (integer)
                 (const :tag "Use the current `fill-column'" t))
  :safe (lambda (x) (or (eq x t) (integerp x)))
  :group 'lisp)

(defun lisp-fill-paragraph (&optional justify)
  "Like \\[fill-paragraph], but handle Emacs Lisp comments and docstrings.
If any of the current line is a comment, fill the comment or the
paragraph of it that point is in, preserving the comment's indentation
and initial semicolons."
  (interactive "P")
  (or (fill-comment-paragraph justify)
      ;; Since fill-comment-paragraph returned nil, that means we're not in
      ;; a comment: Point is on a program line; we are interested
      ;; particularly in docstring lines.
      ;;
      ;; FIXME: The below bindings are probably mostly irrelevant
      ;; since we're now narrowing to a region before filling.
      ;;
      ;; We bind `paragraph-start' and `paragraph-separate' temporarily.  They
      ;; are buffer-local, but we avoid changing them so that they can be set
      ;; to make `forward-paragraph' and friends do something the user wants.
      ;;
      ;; `paragraph-start': The `(' in the character alternative and the
      ;; left-singlequote plus `(' sequence after the \\| alternative prevent
      ;; sexps and backquoted sexps that follow a docstring from being filled
      ;; with the docstring.  This setting has the consequence of inhibiting
      ;; filling many program lines that are not docstrings, which is sensible,
      ;; because the user probably asked to fill program lines by accident, or
      ;; expecting indentation (perhaps we should try to do indenting in that
      ;; case).  The `;' and `:' stop the paragraph being filled at following
      ;; comment lines and at keywords (e.g., in `defcustom').  Left parens are
      ;; escaped to keep font-locking, filling, & paren matching in the source
      ;; file happy.  The `:' must be preceded by whitespace so that keywords
      ;; inside of the docstring don't start new paragraphs (Bug#7751).
      ;;
      ;; `paragraph-separate': A clever regexp distinguishes the first line of
      ;; a docstring and identifies it as a paragraph separator, so that it
      ;; won't be filled.  (Since the first line of documentation stands alone
      ;; in some contexts, filling should not alter the contents the author has
      ;; chosen.)  Only the first line of a docstring begins with whitespace
      ;; and a quotation mark and ends with a period or (rarely) a comma.
      ;;
      ;; The `fill-column' is temporarily bound to
      ;; `emacs-lisp-docstring-fill-column' if that value is an integer.
      (let ((paragraph-start
             (concat paragraph-start
                     "\\|\\s-*\\([(;\"]\\|\\s-:\\|`(\\|#'(\\)"))
	    (paragraph-separate
	     (concat paragraph-separate "\\|\\s-*\".*[,\\.]$"))
            (fill-column (if (and (integerp emacs-lisp-docstring-fill-column)
                                  (derived-mode-p 'emacs-lisp-mode))
                             emacs-lisp-docstring-fill-column
                           fill-column)))
        (let ((ppss (syntax-ppss))
              (start (point))
              ;; Avoid recursion if we're being called directly with
              ;; `M-x lisp-fill-paragraph' in an `emacs-lisp-mode' buffer.
              (fill-paragraph-function t))
          (save-excursion
            (save-restriction
              ;; If we're not inside a string, then do very basic
              ;; filling.  This avoids corrupting embedded strings in
              ;; code.
              (if (not (ppss-comment-or-string-start ppss))
                  (lisp--fill-line-simple)
                ;; If we're in a string, then narrow (roughly) to that
                ;; string before filling.  This avoids filling Lisp
                ;; statements that follow the string.
                (when (ppss-string-terminator ppss)
                  (goto-char (ppss-comment-or-string-start ppss))
                  ;; The string may be unterminated -- in that case, don't
                  ;; narrow.
                  (when (ignore-errors
                          (progn
                            (forward-sexp 1)
                            t))
                    (narrow-to-region (1+ (ppss-comment-or-string-start ppss))
                                      (1- (point)))))
                ;; Move back to where we were.
                (goto-char start)
                ;; We should fill the first line of a string
                ;; separately (since it's usually a doc string).
                (if (= (line-number-at-pos) 1)
                    (narrow-to-region (line-beginning-position)
                                      (line-beginning-position 2))
                  (save-excursion
                    (goto-char (point-min))
                    (forward-line 1)
                    (narrow-to-region (point) (point-max))))
	        (fill-paragraph justify)))))))
  ;; Never return nil.
  t)

(defun lisp--fill-line-simple ()
  (narrow-to-region (line-beginning-position) (line-end-position))
  (goto-char (point-min))
  (while (and (not (eobp))
              (re-search-forward "\\_>" nil t))
    (when (> (current-column) fill-column)
      (let ((start (point)))
        (backward-sexp)
        (if (looking-back "[[(]" (point-min))
            (goto-char start)
          (skip-chars-backward " \t")
          (insert "\n")
          (forward-sexp))))
    (unless (eobp)
      (forward-char 1))))

(defun indent-code-rigidly (start end arg &optional nochange-regexp)
  "Indent all lines of code, starting in the region, sideways by ARG columns.
Does not affect lines starting inside comments or strings, assuming that
the start of the region is not inside them.

Called from a program, takes args START, END, COLUMNS and NOCHANGE-REGEXP.
The last is a regexp which, if matched at the beginning of a line,
means don't indent that line."
  (interactive "r\np")
  (let (state)
    (save-excursion
      (goto-char end)
      (setq end (point-marker))
      (goto-char start)
      (or (bolp)
	  (setq state (parse-partial-sexp (point)
					  (progn
					    (forward-line 1) (point))
					  nil nil state)))
      (while (< (point) end)
	(or (car (nthcdr 3 state))
	    (and nochange-regexp
		 (looking-at nochange-regexp))
	    ;; If line does not start in string, indent it
	    (let ((indent (current-indentation)))
	      (delete-region (point) (progn (skip-chars-forward " \t") (point)))
	      (or (eolp)
		  (indent-to (max 0 (+ indent arg)) 0))))
	(setq state (parse-partial-sexp (point)
					(progn
					  (forward-line 1) (point))
					nil nil state))))))

(provide 'lisp-mode)

;;; lisp-mode.el ends here

debug log:

solving d44c9d6e23d ...
found d44c9d6e23d in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.