unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob 363ae481e2b2bc5033b543240421865715d5b15c 56123 bytes (raw)
name: lisp/progmodes/cc-awk.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
 
;;; cc-awk.el --- AWK specific code within cc-mode.  -*- lexical-binding: t; -*-

;; Copyright (C) 1988, 1994, 1996, 2000-2021 Free Software Foundation,
;; Inc.

;; Author: Alan Mackenzie <acm@muc.de> (originally based on awk-mode.el)
;; Maintainer: emacs-devel@gnu.org
;; Keywords: AWK, cc-mode, unix, languages
;; Package: cc-mode

;; 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:

;; This file contains (most of) the adaptations to cc-mode required for the
;; integration of AWK Mode.
;; It is organized thusly, the sections being separated by page breaks:
;;   1. The AWK Mode syntax table.
;;   2. Regular expressions for analyzing AWK code.
;;   3. Indentation calculation stuff ("c-awk-NL-prop text-property").
;;   4. Syntax-table property/font-locking stuff, including the
;;      font-lock-keywords setting.
;;   5. The AWK Mode before/after-change-functions.
;;   6. AWK Mode specific versions of commands like beginning-of-defun.
;; The AWK Mode keymap, abbreviation table, and the mode function itself are
;; in cc-mode.el.

;;; Code:

(eval-when-compile
  (let ((load-path
	 (if (and (boundp 'byte-compile-dest-file)
		  (stringp byte-compile-dest-file))
	     (cons (file-name-directory byte-compile-dest-file) load-path)
	   load-path)))
    (load "cc-bytecomp" nil t)))

(cc-require 'cc-defs)
(cc-require-when-compile 'cc-langs)
(cc-require-when-compile 'cc-fonts)
(cc-require 'cc-engine)

;; Silence the byte compiler.
(cc-bytecomp-defvar c-new-BEG)
(cc-bytecomp-defvar c-new-END)

;; Some functions in cc-engine that are used below.  There's a cyclic
;; dependency so it can't be required here.  (Perhaps some functions
;; could be moved to cc-engine to avoid it.)
(cc-bytecomp-defun c-backward-token-1)
(cc-bytecomp-defun c-beginning-of-statement-1)
(cc-bytecomp-defun c-backward-sws)
(cc-bytecomp-defun c-forward-sws)

(defvar awk-mode-syntax-table
  (let ((st (make-syntax-table)))
    (modify-syntax-entry ?\\ "\\" st)
    (modify-syntax-entry ?\n ">   " st)
    (modify-syntax-entry ?\r ">   " st)
    (modify-syntax-entry ?\f ">   " st)
    (modify-syntax-entry ?\# "<   " st)
    ;; / can delimit regexes or be a division operator.  By default we assume
    ;; that it is a division sign, and fix the regexp operator cases with
    ;; `c-awk-set-syntax-table-properties'.
    (modify-syntax-entry ?/ "." st)     ; ACM 2002/4/27.
    (modify-syntax-entry ?* "." st)
    (modify-syntax-entry ?+ "." st)
    (modify-syntax-entry ?- "." st)
    (modify-syntax-entry ?= "." st)
    (modify-syntax-entry ?% "." st)
    (modify-syntax-entry ?< "." st)
    (modify-syntax-entry ?> "." st)
    (modify-syntax-entry ?& "." st)
    (modify-syntax-entry ?| "." st)
    (modify-syntax-entry ?_ "_" st)
    (modify-syntax-entry ?\' "." st)
    st)
  "Syntax table in use in AWK Mode buffers.")

\f
;; This section defines regular expressions used in the analysis of AWK code.

;; N.B. In the following regexps, an EOL is either \n OR \r.  This is because
;; Emacs has in the past used \r to mark hidden lines in some fashion (and
;; maybe still does).

(defconst c-awk-esc-pair-re "\\\\\\(.\\|\n\\|\\'\\)")
;;   Matches any escaped (with \) character-pair, including an escaped newline.
(defconst c-awk-non-eol-esc-pair-re "\\\\\\(.\\|\\'\\)")
;;   Matches any escaped (with \) character-pair, apart from an escaped newline.
(defconst c-awk-comment-without-nl "#.*")
;; Matches an AWK comment, not including the terminating NL (if any).  Note
;; that the "enclosing" (elisp) regexp must ensure the # is real.
(defconst c-awk-nl-or-eob "\\(\n\\|\r\\|\\'\\)")
;; Matches a newline, or the end of buffer.

;; "Space" regular expressions.
(eval-and-compile
  (defconst c-awk-escaped-nl "\\\\[\n\r]"))
;; Matches an escaped newline.
(eval-and-compile
  (defconst c-awk-escaped-nls* (concat "\\(" c-awk-escaped-nl "\\)*")))
;; Matches a possibly empty sequence of escaped newlines.  Used in
;; awk-font-lock-keywords.
;; (defconst c-awk-escaped-nls*-with-space*
;;   (concat "\\(" c-awk-escaped-nls* "\\|" "[ \t]+" "\\)*"))
;; The above RE was very slow.  It's runtime was doubling with each additional
;; space :-(  Reformulate it as below:
(eval-and-compile
  (defconst c-awk-escaped-nls*-with-space*
    (concat "\\(" c-awk-escaped-nl "\\|" "[ \t]" "\\)*")))
;; Matches a possibly empty sequence of escaped newlines with optional
;; interspersed spaces and tabs.  Used in awk-font-lock-keywords.
(defconst c-awk-blank-or-comment-line-re
  (concat "[ \t]*\\(#\\|\\\\?$\\)"))
;; Matche (the tail of) a line containing at most either a comment or an
;; escaped EOL.

;; REGEXPS FOR "HARMLESS" STRINGS/LINES.
(defconst c-awk-harmless-_ "_\\([^\"]\\|\\'\\)")
;;   Matches an underline NOT followed by ".
(defconst c-awk-harmless-char-re "[^_#/\"{}();\\\n\r]")
;;   Matches any character not significant in the state machine applying
;; syntax-table properties to "s and /s.
(defconst c-awk-harmless-string*-re
  (concat "\\(" c-awk-harmless-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*"))
;;   Matches a (possibly empty) sequence of characters insignificant in the
;; state machine applying syntax-table properties to "s and /s.
(defconst c-awk-harmless-string*-here-re
  (concat "\\=" c-awk-harmless-string*-re))
;; Matches the (possibly empty) sequence of "insignificant" chars at point.

(defconst c-awk-harmless-line-char-re "[^_#/\"\\\n\r]")
;;   Matches any character but a _, #, /, ", \, or newline.  N.B. _" starts a
;; localization string in gawk 3.1
(defconst c-awk-harmless-line-string*-re
  (concat "\\(" c-awk-harmless-line-char-re "\\|" c-awk-esc-pair-re "\\|" c-awk-harmless-_ "\\)*"))
;;   Matches a (possibly empty) sequence of chars without unescaped /, ", \,
;; #, or newlines.
(defconst c-awk-harmless-line-re
  (concat c-awk-harmless-line-string*-re
	  "\\(" c-awk-comment-without-nl "\\)?" c-awk-nl-or-eob))
;;   Matches (the tail of) an AWK \"logical\" line not containing an unescaped
;; " or /.  "logical" means "possibly containing escaped newlines".  A comment
;; is matched as part of the line even if it contains a " or a /.  The End of
;; buffer is also an end of line.
(defconst c-awk-harmless-lines+-here-re
  (concat "\\=\\(" c-awk-harmless-line-re "\\)+"))
;; Matches a sequence of (at least one) \"harmless-line\" at point.


;; REGEXPS FOR AWK STRINGS.
(defconst c-awk-string-ch-re "[^\"\\\n\r]")
;; Matches any character which can appear unescaped in a string.
(defconst c-awk-string-innards-re
  (concat "\\(" c-awk-string-ch-re "\\|" c-awk-esc-pair-re "\\)*"))
;;   Matches the inside of an AWK string (i.e. without the enclosing quotes).
(defconst c-awk-string-without-end-here-re
  (concat "\\=_?\"" c-awk-string-innards-re))
;;   Matches an AWK string at point up to, but not including, any terminator.
;; A gawk 3.1+ string may look like _"localizable string".
(defconst c-awk-possibly-open-string-re
  (concat "\"\\(" c-awk-string-ch-re "\\|" c-awk-esc-pair-re "\\)*"
	  "\\(\"\\|$\\|\\'\\)"))

;; REGEXPS FOR AWK REGEXPS.
(defconst c-awk-regexp-normal-re "[^[/\\\n\r]")
;;   Matches any AWK regexp character which doesn't require special analysis.
(defconst c-awk-escaped-newlines*-re "\\(\\\\[\n\r]\\)*")
;;   Matches a (possibly empty) sequence of escaped newlines.

;; NOTE: In what follows, "[asdf]" in a regexp will be called a "character
;; list", and "[:alpha:]" inside a character list will be known as a
;; "character class".  These terms for these things vary between regexp
;; descriptions .
(defconst c-awk-regexp-char-class-re
  "\\[:[a-z]+:\\]")
  ;; Matches a character class spec (e.g. [:alpha:]).
(defconst c-awk-regexp-char-list-re
  (concat "\\[\\(" c-awk-escaped-newlines*-re "\\^\\)?" c-awk-escaped-newlines*-re "]?"
	  "\\(" c-awk-esc-pair-re "\\|" c-awk-regexp-char-class-re
	  "\\|" "[^]\n\r]" "\\)*" "\\(]\\|$\\)"))
;;   Matches a regexp char list, up to (but not including) EOL if the ] is
;;   missing.
(defconst c-awk-regexp-innards-re
  (concat "\\(" c-awk-esc-pair-re "\\|" c-awk-regexp-char-list-re
	  "\\|" c-awk-regexp-normal-re "\\)*"))
;;   Matches the inside of an AWK regexp (i.e. without the enclosing /s)
(defconst c-awk-regexp-without-end-re
  (concat "/" c-awk-regexp-innards-re))
;; Matches an AWK regexp up to, but not including, any terminating /.

;; REGEXPS used for scanning an AWK buffer in order to decide IF A '/' IS A
;; REGEXP OPENER OR A DIVISION SIGN.  By "state" in the following is meant
;; whether a '/' at the current position would by a regexp opener or a
;; division sign.
(defconst c-awk-neutral-re
;  "\\([{}@` \t]\\|\\+\\+\\|--\\|\\\\.\\)+") ; changed, 2003/6/7
  "\\([}@` \t]\\|\\+\\+\\|--\\|\\\\\\(.\\|[\n\r]\\)\\)")
;;   A "neutral" char(pair).  Doesn't change the "state" of a subsequent /.
;; This is space/tab, close brace, an auto-increment/decrement operator or an
;; escaped character.  Or one of the (invalid) characters @ or `.  But NOT an
;; end of line (unless escaped).
(defconst c-awk-neutrals*-re
  (concat "\\(" c-awk-neutral-re "\\)*"))
;;   A (possibly empty) string of neutral characters (or character pairs).
(defconst c-awk-var-num-ket-re "[])0-9a-zA-Z_$.]+")
;;   Matches a char which is a constituent of a variable or number, or a ket
;; (i.e. closing bracKET), round or square.  (2019-07): No longer assume that
;; all characters \x80 to \xff are "letters".
(defconst c-awk-div-sign-re
  (concat c-awk-var-num-ket-re c-awk-neutrals*-re "/"))
;;   Will match a piece of AWK buffer ending in / which is a division sign, in
;; a context where an immediate / would be a regexp bracket.  It follows a
;; variable or number (with optional intervening "neutral" characters).  This
;; will only work when there won't be a preceding " or / before the sought /
;; to foul things up.
(defconst c-awk-non-arith-op-bra-re
  "[[({&=:!><,?;'~|]")
;;   Matches an opening BRAcket (of any sort), or any operator character
;; apart from +,-,/,*,%.  For the purpose at hand (detecting a / which is a
;; regexp bracket) these arith ops are unnecessary and a pain, because of "++"
;; and "--".
(defconst c-awk-regexp-sign-re
  (concat c-awk-non-arith-op-bra-re c-awk-neutrals*-re "/"))
;;   Will match a piece of AWK buffer ending in / which is an opening regexp
;; bracket, in a context where an immediate / would be a division sign.  This
;; will only work when there won't be a preceding " or / before the sought /
;; to foul things up.
(defconst c-awk-pre-exp-alphanum-kwd-re
  (concat "\\(^\\|\\=\\|[^_\n\r]\\)\\<"
	  (regexp-opt '("print" "return" "case") t)
	  "\\>\\([^_\n\r]\\|$\\)"))
;;   Matches all AWK keywords which can precede expressions (including
;; /regexp/).
(defconst c-awk-kwd-regexp-sign-re
  (concat c-awk-pre-exp-alphanum-kwd-re c-awk-escaped-nls*-with-space* "/"))
;;   Matches a piece of AWK buffer ending in <kwd> /, where <kwd> is a keyword
;; which can precede an expression.

;; REGEXPS USED FOR FINDING THE POSITION OF A "virtual semicolon"
(defconst c-awk-_-harmless-nonws-char-re "[^#/\"\\\n\r \t]")
(defconst c-awk-non-/-syn-ws*-re
  (concat
   "\\(" c-awk-escaped-nls*-with-space*
         "\\(" c-awk-_-harmless-nonws-char-re "\\|"
               c-awk-non-eol-esc-pair-re "\\|"
	       c-awk-possibly-open-string-re
         "\\)"
   "\\)*"))
(defconst c-awk-space*-/-re (concat c-awk-escaped-nls*-with-space* "/"))
;; Matches optional whitespace followed by "/".
(defconst c-awk-space*-regexp-/-re
  (concat c-awk-escaped-nls*-with-space* "\\s\""))
;; Matches optional whitespace followed by a "/" with string syntax (a matched
;; regexp delimiter).
(defconst c-awk-space*-unclosed-regexp-/-re
  (concat c-awk-escaped-nls*-with-space* "\\s|"))
;; Matches optional whitespace followed by a "/" with string fence syntax (an
;; unmatched regexp delimiter).

\f
;; ACM, 2002/5/29:
;;
;; The next section of code is about determining whether or not an AWK
;; statement is complete or not.  We use this to indent the following line.
;; The determination is pretty straightforward in C, where a statement ends
;; with either a ; or a }.  Only "while" really gives any trouble there, since
;; it might be the end of a do-while.  In AWK, on the other hand, semicolons
;; are rarely used, and EOLs _usually_ act as "virtual semicolons".  In
;; addition, we have the complexity of escaped EOLs.  The core of this
;; analysis is in the middle of the function
;; c-awk-calculate-NL-prop-prev-line, about 130 lines lower down.
;;
;; To avoid continually repeating this expensive analysis, we "cache" its
;; result in a text-property, c-awk-NL-prop, whose value for a line is set on
;; the EOL (if any) which terminates that line.  Should the property be
;; required for the very last line (which has no EOL), it is calculated as
;; required but not cached.  The c-awk-NL-prop property should be thought of
;; as only really valid immediately after a buffer change, not a permanently
;; set property.  (By contrast, the syntax-table text properties (set by an
;; after-change function) must be constantly updated for the mode to work
;; properly).
;;
;; This text property is also used for "syntactic whitespace" movement, this
;; being where the distinction between the values '$' and '}' is significant.
;;
;; The valid values for c-awk-NL-prop are:
;;
;; nil The property is not currently set for this line.
;; '#' There is NO statement on this line (at most a comment), and no open
;;     statement from a previous line which could have been completed on this
;;     line.
;; '{' There is an unfinished statement on this (or a previous) line which
;;     doesn't require \s to continue onto another line, e.g. the line ends
;;     with {, or the && operator, or "if (condition)".  Note that even if the
;;     newline is redundantly escaped, it remains a '{' line.
;; '\' There is an escaped newline at the end of this line and this '\' is
;;     essential to the syntax of the program.  (i.e. if it had been a
;;     frivolous \, it would have been ignored and the line been given one of
;;     the other property values.)
;; '$' A non-empty statement is terminated on the line by an EOL (a "virtual
;;     semicolon").  This might be a content-free line terminating a statement
;;     from the preceding (continued) line (which has property \).
;; '}' A statement, being the last thing (aside from ws/comments) is
;;     explicitly terminated on this line by a closing brace (or sometimes a
;;     semicolon).
;;
;; This set of values has been chosen so that the property's value on a line
;; is completely determined by the contents of the line and the property on
;; the previous line, EXCEPT for where a "while" might be the closing
;; statement of a do-while.

(defun c-awk-after-if-for-while-condition-p (&optional do-lim)
  ;; Are we just after the ) in "if/for/while (<condition>)"?
  ;;
  ;; Note that the end of the ) in a do .... while (<condition>) doesn't
  ;; count, since the purpose of this routine is essentially to decide
  ;; whether to indent the next line.
  ;;
  ;; DO-LIM sets a limit on how far back we search for the "do" of a possible
  ;; do-while.
  ;;
  ;; This function might do hidden buffer changes.
  (and
   (eq (char-before) ?\))
   (save-excursion
     (let ((par-pos (c-safe (scan-lists (point) -1 0))))
       (when par-pos
         (goto-char par-pos)            ; back over "(...)"
         (c-backward-token-1)           ; BOB isn't a problem.
         (or (looking-at "\\(if\\|for\\)\\>\\([^_]\\|$\\)")
             (and (looking-at "while\\>\\([^_]\\|$\\)") ; Ensure this isn't a do-while.
                  (not (eq (c-beginning-of-statement-1 do-lim)
                           'beginning)))))))))

(defun c-awk-after-function-decl-param-list ()
  ;; Are we just after the ) in "function foo (bar)" ?
  ;;
  ;; This function might do hidden buffer changes.
  (and (eq (char-before) ?\))
       (save-excursion
         (let ((par-pos (c-safe (scan-lists (point) -1 0))))
           (when par-pos
             (goto-char par-pos)        ; back over "(...)"
             (c-backward-token-1)       ; BOB isn't a problem
             (and (looking-at "[_a-zA-Z][_a-zA-Z0-9]*\\>")
                  (progn (c-backward-token-1)
                         (looking-at "func\\(tion\\)?\\>"))))))))

;; 2002/11/8:  FIXME!  Check c-backward-token-1/2 for success (0 return code).
(defun c-awk-after-continue-token ()
;; Are we just after a token which can be continued onto the next line without
;; a backslash?
;;
;; This function might do hidden buffer changes.
  (save-excursion
    (c-backward-token-1)              ; FIXME 2002/10/27.  What if this fails?
    (if (and (looking-at "[&|]") (not (bobp)))
        (backward-char)) ; c-backward-token-1 doesn't do this :-(
    (looking-at "[,{?:]\\|&&\\|||\\|do\\>\\|else\\>")))

(defun c-awk-after-rbrace-or-statement-semicolon ()
  ;; Are we just after a } or a ; which closes a statement?
  ;; Be careful about ;s in for loop control bits.  They don't count!
  ;;
  ;; This function might do hidden buffer changes.
  (or (eq (char-before) ?\})
      (and
       (eq (char-before) ?\;)
       (save-excursion
         (let ((par-pos (c-safe (scan-lists (point) -1 1))))
           (when par-pos
             (goto-char par-pos) ; go back to containing (
             (not (and (looking-at "(")
                       (c-backward-token-1) ; BOB isn't a problem
                       (looking-at "for\\>")))))))))

(defun c-awk-back-to-contentful-text-or-NL-prop ()
  ;;  Move back to just after the first found of either (i) an EOL which has
  ;;  the c-awk-NL-prop text-property set; or (ii) non-ws text; or (iii) BOB.
  ;;  We return either the value of c-awk-NL-prop (in case (i)) or nil.
  ;;  Calling functions can best distinguish cases (ii) and (iii) with (bolp).
  ;;
  ;;  Note that an escaped eol counts as whitespace here.
  ;;
  ;;  Kludge: If c-backward-syntactic-ws gets stuck at a BOL, it is likely
  ;;  that the previous line contains an unterminated string (without \).  In
  ;;  this case, assume that the previous line's c-awk-NL-prop is a $.
  ;;
  ;;  POINT MUST BE AT THE START OF A LINE when calling this function.  This
  ;;  is to ensure that the various backward-comment functions will work
  ;;  properly.
  ;;
  ;; This function might do hidden buffer changes.
  (let ((nl-prop nil)
        bol-pos bsws-pos) ; starting pos for a backward-syntactic-ws call.
    (while ;; We are at a BOL here.  Go back one line each iteration.
        (and
         (not (bobp))
         (not (setq nl-prop (c-get-char-property (1- (point)) 'c-awk-NL-prop)))
         (progn (setq bol-pos (c-point 'bopl))
                (setq bsws-pos (point))
                ;; N.B. the following function will not go back past an EOL if
                ;; there is an open string (without \) on the previous line.
                ;; If we find such, set the c-awk-NL-prop on it, too
                ;; (2004/3/29).
                (c-backward-syntactic-ws bol-pos)
                (or (/= (point) bsws-pos)
                    (progn (setq nl-prop ?\$)
			   (c-put-char-property (1- (point)) 'c-awk-NL-prop nl-prop)
                           nil)))
         ;; If we had a backslash at EOL, c-backward-syntactic-ws will
         ;; have gone backwards over it.  Check the backslash was "real".
         (progn
           (if (looking-at "[ \t]*\\\\+$")
               (if (progn
                     (end-of-line)
                     (search-backward-regexp
                      "\\(^\\|[^\\]\\)\\(\\\\\\\\\\)*\\\\$" ; ODD number of \s at EOL  :-)
                      bol-pos t))
                   (progn (end-of-line)   ; escaped EOL.
                          (backward-char)
                          (c-backward-syntactic-ws bol-pos))
                 (end-of-line)))          ; The \ at eol is a fake.
           (bolp))))
    nl-prop))

(defun c-awk-calculate-NL-prop-prev-line (&optional do-lim)
  ;; Calculate and set the value of the c-awk-NL-prop on the immediately
  ;; preceding EOL.  This may also involve doing the same for several
  ;; preceding EOLs.
  ;;
  ;; NOTE that if the property was already set, we return it without
  ;; recalculation.  (This is by accident rather than design.)
  ;;
  ;; Return the property which got set (or was already set) on the previous
  ;; line.  Return nil if we hit BOB.
  ;;
  ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM.
  ;;
  ;; This function might do hidden buffer changes.
  (save-excursion
    (save-match-data
      (beginning-of-line)
      (let* ((pos (point))
             (nl-prop (c-awk-back-to-contentful-text-or-NL-prop)))
        ;; We are either (1) at a BOL (with nl-prop containing the previous
        ;; line's c-awk-NL-prop) or (2) after contentful text on a line.  At
        ;; the BOB counts as case (1), so we test next for bolp rather than
        ;; non-nil nl-prop.
        (when (not (bolp))
          (setq nl-prop
                (cond
                 ;; Incomplete statement which doesn't require escaped EOL?
                 ((or (c-awk-after-if-for-while-condition-p do-lim)
                      (c-awk-after-function-decl-param-list)
                      (c-awk-after-continue-token))
                  ?\{)
                 ;; Escaped EOL (where there's also something to continue)?
                 ((and (looking-at "[ \t]*\\\\$")
                       (not (c-awk-after-rbrace-or-statement-semicolon)))
                  ?\\)
		 ;; A statement was completed on this line.  How?
		 ((memq (char-before) '(?\; ?\}))  ?\})	; Real ; or }
                 (t ?\$)))            ; A virtual semicolon.
          (end-of-line)
          (c-put-char-property (point) 'c-awk-NL-prop nl-prop)
          (forward-line))

        ;; We are now at a (possibly empty) sequence of content-free lines.
        ;; Set c-awk-NL-prop on each of these lines's EOL.
        (while (< (point) pos)         ; one content-free line each iteration.
          (cond              ; recalculate nl-prop from previous line's value.
           ((memq nl-prop '(?\} ?\$ nil)) (setq nl-prop ?\#))
           ((eq nl-prop ?\\)
            (if (not (looking-at "[ \t]*\\\\$")) (setq nl-prop ?\$)))
           ;; ?\# (empty line) and ?\{ (open stmt) don't change.
           )
          (forward-line)
          (c-put-char-property (1- (point)) 'c-awk-NL-prop nl-prop))
        nl-prop))))

(defun c-awk-get-NL-prop-prev-line (&optional do-lim)
  ;; Get the c-awk-NL-prop text-property from the previous line, calculating
  ;; it if necessary.  Return nil if we're already at BOB.
  ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM.
  ;;
  ;; This function might do hidden buffer changes.
  (if (bobp)
      nil
    (or (c-get-char-property (c-point 'eopl) 'c-awk-NL-prop)
        (c-awk-calculate-NL-prop-prev-line do-lim))))

(defun c-awk-get-NL-prop-cur-line (&optional do-lim)
  ;; Get the c-awk-NL-prop text-property from the current line, calculating it
  ;; if necessary. (As a special case, the property doesn't get set on an
  ;; empty line at EOB (there's no position to set the property on), but the
  ;; function returns the property value an EOL would have got.)
  ;;
  ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM.
  ;;
  ;; This function might do hidden buffer changes.
  (save-excursion
    (let ((extra-nl nil))
      (end-of-line)                ; Necessary for the following test to work.
      (when (= (forward-line) 1)        ; if we were on the last line....
        (insert-char ?\n 1) ; ...artificial eol is needed for comment detection.
        (setq extra-nl t))
      (prog1 (c-awk-get-NL-prop-prev-line do-lim)
        (if extra-nl (delete-char -1))))))

(defsubst c-awk-prev-line-incomplete-p (&optional do-lim)
  ;; Is there an incomplete statement at the end of the previous line?
  ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM.
  ;;
  ;; This function might do hidden buffer changes.
  (memq (c-awk-get-NL-prop-prev-line do-lim) '(?\\ ?\{)))

(defsubst c-awk-cur-line-incomplete-p (&optional do-lim)
  ;; Is there an incomplete statement at the end of the current line?
  ;; See c-awk-after-if-for-while-condition-p for a description of DO-LIM.
  ;;
  ;; This function might do hidden buffer changes.
  (memq (c-awk-get-NL-prop-cur-line do-lim) '(?\\ ?\{)))

;; NOTES ON "VIRTUAL SEMICOLONS"
;;
;; A "virtual semicolon" is what terminates a statement when there is no ;
;; or } to do the job.  Like point, it is considered to lie _between_ two
;; characters.  As from mid-March 2004, it is considered to lie just after
;; the last non-syntactic-whitespace character on the line; (previously, it
;; was considered an attribute of the EOL on the line).  A real semicolon
;; never counts as a virtual one.

(defun c-awk-at-vsemi-p (&optional pos)
  ;; Is there a virtual semicolon at POS (or POINT)?
  (save-excursion
    (let* (nl-prop
	   (pos-or-point (progn (if pos (goto-char pos)) (point)))
	   (bol (c-point 'bol)) (eol (c-point 'eol)))
      (c-awk-beginning-of-logical-line)
      ;; Next `while' goes round one logical line (ending in, e.g. "\\") per
      ;; iteration.  Such a line is rare, and can only be an open string
      ;; ending in an escaped \.
      (while
	  (progn
	    ;; Next `while' goes over a division sign or /regexp/ per iteration.
	    (while
		(and
		 (< (point) eol)
		 (progn
		   (search-forward-regexp c-awk-non-/-syn-ws*-re eol)
		   (looking-at c-awk-space*-/-re)))
	      (cond
	       ((looking-at c-awk-space*-regexp-/-re) ; /regexp/
		(forward-sexp))
	       ((looking-at c-awk-space*-unclosed-regexp-/-re) ; Unclosed /regexp
		(condition-case nil
		    (progn
		      (forward-sexp)
		      (backward-char))	; Move to end of (logical) line.
		  (error (end-of-line)))) ; Happens at EOB.
	       (t 			; division sign
		(c-forward-syntactic-ws)
		(forward-char))))
	    (< (point) bol))
	(forward-line))
      (and (eq (point) pos-or-point)
	   (progn
	     (while (and (eq (setq nl-prop (c-awk-get-NL-prop-cur-line)) ?\\)
			 (eq (forward-line) 0)
			 (looking-at c-awk-blank-or-comment-line-re)))
	     (eq nl-prop ?\$))))))

(defun c-awk-vsemi-status-unknown-p ()
  ;; Are we unsure whether there is a virtual semicolon on the current line?
  ;; DO NOT under any circumstances attempt to calculate this; that would
  ;; defeat the (admittedly kludgy) purpose of this function, which is to
  ;; prevent an infinite recursion in c-beginning-of-statement-1 when point
  ;; starts at a `while' token.
  (not (c-get-char-property (c-point 'eol) 'c-awk-NL-prop)))

(defun c-awk-clear-NL-props (beg _end)
  ;; This function is run from before-change-hooks.  It clears the
  ;; c-awk-NL-prop text property from beg to the end of the buffer (The END
  ;; parameter is ignored).  This ensures that the indentation engine will
  ;; never use stale values for this property.
  ;;
  ;; This function might do hidden buffer changes.
  (save-restriction
    (widen)
    (c-clear-char-properties beg (point-max) 'c-awk-NL-prop)))

(defun c-awk-unstick-NL-prop ()
  ;; Ensure that the text property c-awk-NL-prop is "non-sticky".  Without
  ;; this, a new newline inserted after an old newline (e.g. by C-j) would
  ;; inherit any c-awk-NL-prop from the old newline.  This would be a Bad
  ;; Thing.  This function's action is required by c-put-char-property.
  (if (and (boundp 'text-property-default-nonsticky) ; doesn't exist in XEmacs
           (not (assoc 'c-awk-NL-prop text-property-default-nonsticky)))
      (setq text-property-default-nonsticky
            (cons '(c-awk-NL-prop . t) text-property-default-nonsticky))))

;; The following is purely a diagnostic command, to be commented out of the
;; final release.  ACM, 2002/6/1
;; (defun NL-props ()
;;   (interactive)
;;   (let (pl-prop cl-prop)
;;     (message "Prev-line: %s  Cur-line: %s"
;;              (if (setq pl-prop (c-get-char-property (c-point 'eopl) 'c-awk-NL-prop))
;;                  (char-to-string pl-prop)
;;                "nil")
;;              (if (setq cl-prop (c-get-char-property (c-point 'eol) 'c-awk-NL-prop))
;;                  (char-to-string cl-prop)
;;                "nil"))))
;(define-key awk-mode-map [?\C-c ?\r] 'NL-props) ; commented out, 2002/8/31
;for now.  In the byte compiled version, this causes things to crash because
;awk-mode-map isn't yet defined.  :-(

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
\f
;; The following section of the code is to do with font-locking.  The biggest
;; problem for font-locking is deciding whether a / is a regular expression
;; delimiter or a division sign - determining precisely where strings and
;; regular expressions start and stop is also troublesome.  This is the
;; purpose of the function c-awk-set-syntax-table-properties and the myriad
;; elisp regular expressions it uses.
;;
;; Because AWK is a line oriented language, I felt the normal cc-mode strategy
;; for font-locking unterminated strings (i.e. font-locking the buffer up to
;; the next string delimiter as a string) was inappropriate.  Instead,
;; unbalanced string/regexp delimiters are given the warning font, being
;; refonted with the string font as soon as the matching delimiter is entered.
;;
;; This requires the region processed by the current font-lock after-change
;; function to have access to the start of the string/regexp, which may be
;; several lines back.  The elisp "advice" feature is used on these functions
;; to allow this.

(defun c-awk-font-lock-invalid-namespace-separators (limit)
  ;; This function will be called from font-lock for a region bounded by POINT
  ;; and LIMIT, as though it were to identify a keyword for
  ;; font-lock-keyword-face.  It always returns NIL to inhibit this and
  ;; prevent a repeat invocation.  See elisp/lispref page "Search-based
  ;; Fontification".
  ;;
  ;; This function gives invalid GAWK namepace separators (::)
  ;; font-lock-warning-face.  "Invalid" here means there are spaces, etc.,
  ;; around a separator, or there are more than one of them in an identifier.
  ;; Invalid separators inside function declaration parentheses are handled
  ;; elsewhere.
  (while (and
	  (< (point) limit)
	  (c-syntactic-re-search-forward
	   (eval-when-compile
	     (concat "\\([^" (c-lang-const c-symbol-chars awk) "]::\\)"
		     "\\|"
		     ;; "\\(::[^" (c-lang-const c-symbol-start awk) "]\\)"
		     "\\(::[^" c-alpha "_" "]\\)"
		     "\\|"
		     "\\(::[" (c-lang-const c-symbol-chars awk) "]*::\\)"))
	   limit 'bound))
    (cond
     ((match-beginning 1) 		; " ::"
      (c-put-font-lock-face (1+ (match-beginning 1)) (match-end 1)
			    'font-lock-warning-face)
      (goto-char (- (match-end 1) 2)))
     ((match-beginning 2)		; ":: "
      (c-put-font-lock-face (match-beginning 2) (1- (match-end 2))
			    'font-lock-warning-face)
      (goto-char (1- (match-end 2))))
     (t					; "::foo::"
      (c-put-font-lock-face (match-beginning 3) (+ 2 (match-beginning 3))
			    'font-lock-warning-face)
      (c-put-font-lock-face (- (match-end 3) 2) (match-end 3)
			    'font-lock-warning-face)
      (goto-char (- (match-end 3) 2)))))
    nil)

(defun c-awk-beginning-of-logical-line (&optional pos)
;; Go back to the start of the (apparent) current line (or the start of the
;; line containing POS), returning the buffer position of that point.  I.e.,
;; go back to the last line which doesn't have an escaped EOL before it.
;;
;; This is guaranteed to be "safe" for syntactic analysis, i.e. outwith any
;; comment, string or regexp.  IT MAY WELL BE that this function should not be
;; executed on a narrowed buffer.
;;
;; This function might do hidden buffer changes.
  (if pos (goto-char pos))
  (forward-line 0)
  (while (and (> (point) (point-min))
              (eq (char-before (1- (point))) ?\\))
    (forward-line -1))
  (point))

(defun c-awk-beyond-logical-line (&optional pos)
;; Return the position just beyond the (apparent) current logical line, or the
;; one containing POS.  This is usually the beginning of the next line which
;; doesn't follow an escaped EOL.  At EOB, this will be EOB.
;;
;; Point is unchanged.
;;
;; This is guaranteed to be "safe" for syntactic analysis, i.e. outwith any
;; comment, string or regexp.  IT MAY WELL BE that this function should not be
;; executed on a narrowed buffer.
  (save-excursion
    (if pos (goto-char pos))
    (end-of-line)
    (while (and (< (point) (point-max))
		(eq (char-before) ?\\))
      (end-of-line 2))
    (if (< (point) (point-max))
	(1+ (point))
      (point))))

;; ACM, 2002/02/15: The idea of the next function is to put the "Error font"
;; on strings/regexps which are missing their closing delimiter.
;; 2002/4/28.  The default syntax for / has been changed from "string" to
;; "punctuation", to reduce hassle when this character appears within a string
;; or comment.

(defun c-awk-set-string-regexp-syntax-table-properties (beg end)
;; BEG and END bracket a (possibly unterminated) string or regexp.  The
;; opening delimiter is after BEG, and the closing delimiter, IF ANY, is AFTER
;; END.  Set the appropriate syntax-table properties on the delimiters and
;; contents of this string/regex.
;;
;; "String" here can also mean a gawk 3.1 "localizable" string which starts
;; with _".  In this case, we step over the _ and ignore it; It will get it's
;; font from an entry in awk-font-lock-keywords.
;;
;; If the closing delimiter is missing (i.e., there is an EOL there) set the
;; STRING-FENCE property on the opening " or / and closing EOL.
;;
;; This function does hidden buffer changes.
  (if (eq (char-after beg) ?_) (setq beg (1+ beg)))

  ;; First put the properties on the delimiters.
  (cond ((eq end (point-max))           ; string/regexp terminated by EOB
         (c-put-char-property beg 'syntax-table '(15))) ; (15) = "string fence"
        ((/= (char-after beg) (char-after end)) ; missing end delimiter
         (c-put-char-property beg 'syntax-table '(15))
         (c-put-char-property end 'syntax-table '(15)))
        ((eq (char-after beg) ?/)       ; Properly bracketed regexp
         (c-put-char-property beg 'syntax-table '(7)) ; (7) = "string"
         (c-put-char-property end 'syntax-table '(7)))
        (t))                       ; Properly bracketed string: Nothing to do.
  ;; Now change the properties of any escaped "s in the string to punctuation.
  (save-excursion
    (goto-char (1+ beg))
    (or (eobp)
        (while (search-forward "\"" end t)
          (c-put-char-property (1- (point)) 'syntax-table '(1))))))

(defun c-awk-syntax-tablify-string ()
  ;; Point is at the opening " or _" of a string.  Set the syntax-table
  ;; properties on this string, leaving point just after the string.
  ;;
  ;; The result is nil if a / immediately after the string would be a regexp
  ;; opener, t if it would be a division sign.
  ;;
  ;; This function does hidden buffer changes.
  (search-forward-regexp c-awk-string-without-end-here-re nil t) ; a (possibly unterminated) string
  (c-awk-set-string-regexp-syntax-table-properties
   (match-beginning 0) (match-end 0))
  (cond ((looking-at "\"")
         (forward-char)
         t)                             ; In AWK, ("15" / 5) gives 3 ;-)
        ((looking-at "[\n\r]")          ; Unterminated string with EOL.
         (forward-char)
         nil)                           ; / on next line would start a regexp
        (t nil)))                       ; Unterminated string at EOB

(defun c-awk-syntax-tablify-/ (anchor anchor-state-/div)
  ;; Point is at a /.  Determine whether this is a division sign or a regexp
  ;; opener, and if the latter, apply syntax-table properties to the entire
  ;; regexp.  Point is left immediately after the division sign or regexp, as
  ;; the case may be.
  ;;
  ;; ANCHOR-STATE-/DIV identifies whether a / at ANCHOR would have been a
  ;; division sign (value t) or a regexp opener (value nil).  The idea is that
  ;; we analyze the line from ANCHOR up till point to determine what the / at
  ;; point is.
  ;;
  ;; The result is what ANCHOR-STATE-/DIV (see above) is where point is left.
  ;;
  ;; This function does hidden buffer changes.
  (let ((/point (point)))
    (goto-char anchor)
    ;; Analyze the line to find out what the / is.
    (if (if anchor-state-/div
	    (not (search-forward-regexp c-awk-regexp-sign-re (1+ /point) t))
	  (and (not (search-forward-regexp c-awk-kwd-regexp-sign-re (1+ /point) t))
	       (search-forward-regexp c-awk-div-sign-re (1+ /point) t)))
	;; A division sign.
	(progn (goto-char (1+ /point)) nil)
      ;; A regexp opener
      ;; Jump over the regexp innards, setting the match data.
      (goto-char /point)
      (search-forward-regexp c-awk-regexp-without-end-re)
      (c-awk-set-string-regexp-syntax-table-properties
       (match-beginning 0) (match-end 0))
      (cond ((looking-at "/")           ; Terminating /
             (forward-char)
             t)
            ((looking-at "[\n\r]")      ; Incomplete regexp terminated by EOL
             (forward-char)
             nil)                  ; / on next line would start another regexp
            (t nil)))))                 ; Unterminated regexp at EOB

(defun c-awk-set-syntax-table-properties (lim)
;;     Scan the buffer text between point and LIM, setting (and clearing) the
;; syntax-table property where necessary.
;;
;; This function is designed to be called as the FUNCTION in a MATCHER
;; in font-lock-syntactic-keywords, and it always returns NIL (to
;; inhibit repeated calls from font-lock: See elisp info page
;; "Search-based Fontification").  (2015-11-24: CC Mode doesn't use
;; `font-lock-syntactic-keywords' and hasn't done for a very long
;; time, if ever.  ACM.)  This function gets called, with a bit of
;; glue, from after-change-functions whether or not font-lock is
;; active.  Point is left "undefined" after this function exits.  THE
;; BUFFER SHOULD HAVE BEEN WIDENED, AND ANY PRECIOUS MATCH-DATA SAVED
;; BEFORE CALLING THIS ROUTINE.
;;
;; We need to set/clear the syntax-table property on:
;; (i) / - It is set to "string" on a / which is the opening or closing
;;     delimiter of the properly terminated regexp (and left unset on a
;;     division sign).
;; (ii) the opener of an unterminated string/regexp, we set the property
;;    "generic string delimiter" on both the opening " or / and the end of the
;;    line where the closing delimiter is missing.
;; (iii) "s inside strings/regexps (these will all be escaped "s).  They are
;;   given the property "punctuation".  This will later allow other routines
;;   to use the regexp "\\S\"*" to skip over the string innards.
;; (iv) Inside a comment, all syntax-table properties are cleared.
;;
;; This function does hidden buffer changes.
  (let (anchor
	(anchor-state-/div nil)) ; t means a following / would be a div sign.
    (c-awk-beginning-of-logical-line) ; ACM 2002/7/21.  This is probably redundant.
    (c-clear-char-properties (point) lim 'syntax-table)
    ;; Once round the next loop for each string, regexp, or div sign
    (while (progn
             ;; Skip any "harmless" lines before the next tricky one.
             (if (search-forward-regexp c-awk-harmless-lines+-here-re nil t)
                 (setq anchor-state-/div nil))
             (< (point) lim))
      (setq anchor (point))
      (search-forward-regexp c-awk-harmless-string*-here-re nil t)
      ;; We are now looking at either a " or a / or a brace/paren/semicolon.
      ;; Do our thing on the string, regexp or division sign or update
      ;; our state.
      (setq anchor-state-/div
	    (cond
	     ((looking-at "_?\"")
	      (c-awk-syntax-tablify-string))
	     ((eq (char-after) ?/)
	      (c-awk-syntax-tablify-/ anchor anchor-state-/div))
	     ((memq (char-after) '(?{ ?} ?\( ?\;))
	      (forward-char)
	      nil)
	     (t 			; ?\)
	      (forward-char)
	      t))))
    nil))

;; ACM, 2002/07/21: Thoughts: We need an AWK Mode after-change function to set
;; the syntax-table properties even when font-lock isn't enabled, for the
;; subsequent use of movement functions, etc.  However, it seems that if font
;; lock _is_ enabled, we can always leave it to do the job.
(defvar c-awk-old-ByLL 0)
(make-variable-buffer-local 'c-awk-old-Byll)
;; Just beyond logical line following the region which is about to be changed.
;; Set in c-awk-record-region-clear-NL and used in c-awk-after-change.

(defun c-awk-record-region-clear-NL (_beg end)
;; This function is called exclusively from the before-change-functions hook.
;; It does two things: Finds the end of the (logical) line on which END lies,
;; and clears c-awk-NL-prop text properties from this point onwards.  BEG is
;; ignored.
;;
;; On entry, the buffer will have been widened and match-data will have been
;; saved; point is undefined on both entry and exit; the return value is
;; ignored.
;;
;; This function does hidden buffer changes.
  (c-save-buffer-state ()
    (setq c-awk-old-ByLL (c-awk-beyond-logical-line end))
    (c-save-buffer-state nil
      (c-awk-clear-NL-props end (point-max)))))

(defun c-awk-end-of-change-region (beg end old-len)
  ;; Find the end of the region which needs to be font-locked after a change.
  ;; This is the end of the logical line on which the change happened, either
  ;; as it was before the change, or as it is now, whichever is later.
  ;; N.B. point is left undefined.
  (max (+ (- c-awk-old-ByLL old-len) (- end beg))
       (c-awk-beyond-logical-line end)))

;; ACM 2002/5/25.  When font-locking is invoked by a buffer change, the region
;; specified by the font-lock after-change function must be expanded to
;; include ALL of any string or regexp within the region.  The simplest way to
;; do this in practice is to use the beginning/end-of-logical-line functions.
;; Don't overlook the possibility of the buffer change being the "recapturing"
;; of a previously escaped newline.

;; ACM 2008-02-05:
(defun c-awk-extend-and-syntax-tablify-region (beg end old-len)
  ;; Expand the region (BEG END) as needed to (c-new-BEG c-new-END) then put
  ;; `syntax-table' properties on this region.
  ;;
  ;; This function is called from an after-change function, BEG END and
  ;; OLD-LEN being the standard parameters.
  ;;
  ;; Point is undefined both before and after this function call, the buffer
  ;; has been widened, and match-data saved.  The return value is ignored.
  ;;
  ;; It prepares the buffer for font
  ;; locking, hence must get called before `font-lock-after-change-function'.
  ;;
  ;; This function is the AWK value of `c-before-font-lock-function'.
  ;; It does hidden buffer changes.
  (c-save-buffer-state ()
    (setq c-new-END (c-awk-end-of-change-region beg end old-len))
    (setq c-new-BEG (c-awk-beginning-of-logical-line beg))
    (goto-char c-new-BEG)
    (c-awk-set-syntax-table-properties c-new-END)))

(defun c-awk-context-expand-fl-region (beg end)
  ;; Return a cons (NEW-BEG . NEW-END), where NEW-BEG is the beginning of the
  ;; logical line BEG is on, and NEW-END is the beginning of the line after
  ;; the end of the logical line that END is on.
  (cons (save-excursion (c-awk-beginning-of-logical-line beg))
	(c-awk-beyond-logical-line end)))

;; Awk regexps written with help from Peter Galbraith
;; <galbraith@mixing.qc.dfo.ca>.
;; Take GNU Emacs's 'words out of the following regexp-opts.  They don't work
;; in XEmacs 21.4.4.  acm 2002/9/19.
(defconst awk-font-lock-keywords
  (eval-when-compile
    (list
     ;; Function declarations.
     `(,(c-make-font-lock-search-function
	 "^\\s *\\(func\\(tion\\)?\\)\\s +\\(\\(\\sw+\\(::\\sw+\\)?\\)\\s *\\)?\\(([^()]*)\\)?"
	 '(1 font-lock-keyword-face t)
	 ;; We can't use LAXMATCH in `c-make-font-lock-search-function', so....
	 '((when (match-beginning 4)
	     (c-put-font-lock-face
	      (match-beginning 4) (match-end 4) font-lock-function-name-face)
	     nil))
	 ;; Put warning face on any use of :: inside the parens.
	 '((when (match-beginning 6)
	     (goto-char (1+ (match-beginning 6)))
	     (let ((end (1- (match-end 6))))
	       (while (and (< (point) end)
			   (c-syntactic-re-search-forward "::" end t))
		 (c-put-font-lock-face (- (point) 2) (point)
				       'font-lock-warning-face)))
	     nil))))

     ;; Variable names.
     (cons
      (concat "\\<"
	      (regexp-opt
	       '("ARGC" "ARGIND" "ARGV" "BINMODE" "CONVFMT" "ENVIRON"
		 "ERRNO" "FIELDWIDTHS" "FILENAME" "FNR" "FPAT" "FS" "FUNCTAB"
		 "IGNORECASE" "LINT" "NF" "NR" "OFMT" "OFS" "ORS" "PREC"
		 "PROCINFO" "RLENGTH" "ROUNDMODE" "RS" "RSTART" "RT" "SUBSEP"
		 "SYNTAB" "TEXTDOMAIN") t) "\\>")
      'font-lock-variable-name-face)

     ;; Special file names.  (acm, 2002/7/22)
     ;; The following regexp was created by first evaluating this in GNU Emacs 21.1:
     ;; (regexp-opt '("/dev/stdin" "/dev/stdout" "/dev/stderr" "/dev/fd/n" "/dev/pid"
     ;;                 "/dev/ppid" "/dev/pgrpid" "/dev/user") 'words)
     ;; , removing the "?:" from each "\\(?:" (for backward compatibility with older Emacsen)
     ;; , replacing the "n" in "dev/fd/n" with "[0-9]+"
     ;; , removing the unwanted \\< at the beginning, and finally filling out the
     ;; regexp so that a " must come before, and either a " or heuristic stuff after.
     ;; The surrounding quotes are fontified along with the filename, since, semantically,
     ;; they are an indivisible unit.
     '("\\(\"/dev/\\(fd/[0-9]+\\|p\\(\\(\\(gr\\)?p\\)?id\\)\\|\
std\\(err\\|in\\|out\\)\\|user\\)\\)\\>\
\\(\\(\"\\)\\|\\([^\"/\n\r][^\"\n\r]*\\)?$\\)"
       (1 font-lock-variable-name-face t)
       (8 font-lock-variable-name-face t t))
     ;; Do the same (almost) with
     ;; (regexp-opt '("/inet/tcp/lport/rhost/rport" "/inet/udp/lport/rhost/rport"
     ;;                 "/inet/raw/lport/rhost/rport") 'words)
     ;; This cannot be combined with the above pattern, because the match number
     ;; for the (optional) closing \" would then exceed 9.
     '("\\(\"/inet/\\(\\(raw\\|\\(tc\\|ud\\)p\\)/lport/rhost/rport\\)\\)\\>\
\\(\\(\"\\)\\|\\([^\"/\n\r][^\"\n\r]*\\)?$\\)"
       (1 font-lock-variable-name-face t)
       (6 font-lock-variable-name-face t t))

     ;; Keywords.
     (concat "\\<"
	     (regexp-opt
	      '("BEGIN" "BEGINFILE" "END" "ENDFILE"
		"break" "case" "continue" "default" "delete"
		"do" "else" "exit" "for" "getline" "if" "in" "next"
		"nextfile" "return" "switch" "while")
	      t) "\\>")

     ;; Builtins.
     `(eval . (list
	       ,(concat
		 "\\<"
		 (regexp-opt
		  '("adump" "and" "asort" "asorti" "atan2" "bindtextdomain" "close"
		    "compl" "cos" "dcgettext" "dcngettext" "exp" "extension" "fflush"
		    "gensub" "gsub" "index" "int" "isarray" "length" "log" "lshift"
		    "match" "mktime" "or" "patsplit" "print" "printf" "rand" "rshift"
		    "sin" "split" "sprintf" "sqrt" "srand" "stopme"
		    "strftime" "strtonum" "sub" "substr"  "system"
		    "systime" "tolower" "toupper" "typeof" "xor")
		  t)
		 "\\>")
	       0 c-preprocessor-face-name))

     ;; Directives
     `(eval . '("@\\(include\\|load\\|namespace\\)\\>" 0 ,c-preprocessor-face-name))

     ;; gawk debugging keywords.  (acm, 2002/7/21)
     ;; (Removed, 2003/6/6.  These functions are now fontified as built-ins)
     ;;	(list (concat "\\<" (regexp-opt '("adump" "stopme") t) "\\>")
     ;;	   0 'font-lock-warning-face)

     ;; User defined functions with an apparent spurious space before the
     ;; opening parenthesis.  acm, 2002/5/30.
     `(,(concat "\\(\\w\\|_\\)" c-awk-escaped-nls* "\\s "
		c-awk-escaped-nls*-with-space* "(")
       (0 'font-lock-warning-face))

     ;; Double :: tokens, or the same with space(s) around them.
     #'c-awk-font-lock-invalid-namespace-separators

     ;; Space after \ in what looks like an escaped newline.  2002/5/31
     '("\\\\\\s +$" 0 font-lock-warning-face t)

     ;; Unbalanced string (") or regexp (/) delimiters.  2002/02/16.
     '("\\s|" 0 font-lock-warning-face t nil)
     ;; gawk 3.1 localizable strings ( _"translate me!").  2002/5/21
     '("\\(_\\)\\s|" 1 font-lock-warning-face)
     '("\\(_\\)\\s\"" 1 font-lock-string-face) ; FIXME! not for XEmacs. 2002/10/6
     ))
  "Default expressions to highlight in AWK mode.")
\f
;; ACM 2002/9/29.  Movement functions, e.g. for C-M-a and C-M-e

;; The following three regexps differ from those earlier on in cc-awk.el in
;; that they assume the syntax-table properties have been set.  They are thus
;; not useful for code which sets these properties.
(defconst c-awk-terminated-regexp-or-string-here-re "\\=\\s\"\\S\"*\\s\"")
;; Matches a terminated string/regexp.

(defconst c-awk-unterminated-regexp-or-string-here-re "\\=\\s|\\S|*$")
;; Matches an unterminated string/regexp, NOT including the eol at the end.

(defconst c-awk-harmless-pattern-characters*
  (concat "\\([^{;#/\"\\\n\r]\\|" c-awk-esc-pair-re "\\)*"))
;; Matches any "harmless" character in a pattern or an escaped character pair.

(defun c-awk-at-statement-end-p ()
  ;; Point is not inside a comment or string.  Is it AT the end of a
  ;; statement?  This means immediately after the last non-ws character of the
  ;; statement.  The caller is responsible for widening the buffer, if
  ;; appropriate.
  (and (not (bobp))
       (save-excursion
	 (backward-char)
	 (or (looking-at "[};]")
	     (and (memq (c-awk-get-NL-prop-cur-line) '(?\$ ?\\))
		  (looking-at
		   (eval-when-compile
		     (concat "[^ \t\n\r\\]" c-awk-escaped-nls*-with-space*
			     "[#\n\r]"))))))))

(defun c-awk-beginning-of-defun (&optional arg)
  "Move backward to the beginning of an AWK \"defun\".  With ARG, do it that
many times.  Negative arg -N means move forward to Nth following beginning of
defun.  Returns t unless search stops due to beginning or end of buffer.

By a \"defun\" is meant either a pattern-action pair or a function.  The start
of a defun is recognized as code starting at column zero which is neither a
closing brace nor a comment nor a continuation of the previous line.  Unlike
in some other modes, having an opening brace at column 0 is neither necessary
nor helpful.

Note that this function might do hidden buffer changes.  See the
comment at the start of cc-engine.el for more info."
  (interactive "p")
  (or arg (setq arg 1))
  (save-match-data
    (c-save-buffer-state                ; ensures the buffer is writable.
     nil
     (let ((found t))     ; Has the most recent regexp search found b-of-defun?
       (if (>= arg 0)
           ;; Go back one defun each time round the following loop. (For +ve arg)
           (while (and found (> arg 0) (not (eq (point) (point-min))))
             ;; Go back one "candidate" each time round the next loop until one
             ;; is genuinely a beginning-of-defun.
             (while (and (setq found (search-backward-regexp
                                      "^[^#} \t\n\r]" (point-min) 'stop-at-limit))
                         (not (memq (c-awk-get-NL-prop-prev-line) '(?\$ ?\} ?\#)))))
             (setq arg (1- arg)))
         ;; The same for a -ve arg.
         (if (not (eq (point) (point-max))) (forward-char 1))
         (while (and found (< arg 0) (not (eq (point) (point-max)))) ; The same for -ve arg.
           (while (and (setq found (search-forward-regexp
                                    "^[^#} \t\n\r]" (point-max) 'stop-at-limit))
                       (not (memq (c-awk-get-NL-prop-prev-line) '(?\$ ?\} ?\#)))))
           (setq arg (1+ arg)))
         (if found (goto-char (match-beginning 0))))
       (eq arg 0)))))

(defun c-awk-forward-awk-pattern ()
  ;; Point is at the start of an AWK pattern (which may be null) or function
  ;; declaration.  Move to the pattern's end, and past any trailing space or
  ;; comment.  Typically, we stop at the { which denotes the corresponding AWK
  ;; action/function body.  Otherwise we stop at the EOL (or ;) marking the
  ;; absence of an explicit action.
  ;;
  ;; This function might do hidden buffer changes.
  (while
      (progn
        (search-forward-regexp c-awk-harmless-pattern-characters*)
        (if (looking-at "#") (end-of-line))
        (cond
         ((eobp) nil)
         ((looking-at "[{;]") nil)  ; We've finished!
         ((eolp)
          (if (c-awk-cur-line-incomplete-p)
              (forward-line)            ; returns non-nil
            nil))
         ((search-forward-regexp c-awk-terminated-regexp-or-string-here-re nil t))
         ((search-forward-regexp c-awk-unterminated-regexp-or-string-here-re nil t))
         ((looking-at "/") (forward-char) t))))) ; division sign.

(defun c-awk-end-of-defun1 ()
  ;; point is at the start of a "defun".  Move to its end.  Return end position.
  ;;
  ;; This function might do hidden buffer changes.
  (c-awk-forward-awk-pattern)
  (cond
   ((looking-at "{") (goto-char (scan-sexps (point) 1)))
   ((looking-at ";") (forward-char))
   ((eolp))
   (t (error "c-awk-end-of-defun1:  Failure of c-awk-forward-awk-pattern")))
  (point))

(defun c-awk-beginning-of-defun-p ()
  ;; Are we already at the beginning of a defun?  (i.e. at code in column 0
  ;; which isn't a }, and isn't a continuation line of any sort.
  ;;
  ;; This function might do hidden buffer changes.
  (and (looking-at "^[^#} \t\n\r]")
       (not (c-awk-prev-line-incomplete-p))))

(defun c-awk-end-of-defun (&optional arg)
  "Move forward to next end of defun.  With argument, do it that many times.
Negative argument -N means move back to Nth preceding end of defun.

An end of a defun occurs right after the closing brace that matches the
opening brace at its start, or immediately after the AWK pattern when there is
no explicit action; see function `c-awk-beginning-of-defun'.

Note that this function might do hidden buffer changes.  See the
comment at the start of cc-engine.el for more info."
  (interactive "p")
  (or arg (setq arg 1))
  (save-match-data
    (c-save-buffer-state
     nil
     (let ((start-point (point)) end-point)
       ;; Strategy: (For +ve ARG): If we're not already at a beginning-of-defun,
       ;; move backwards to one.
       ;; Repeat [(i) move forward to end-of-current-defun (see below);
       ;;         (ii) If this isn't it, move forward to beginning-of-defun].
       ;; We start counting ARG only when step (i) has passed the original point.
       (when (> arg 0)
         ;; Try to move back to a beginning-of-defun, if not already at one.
         (if (not (c-awk-beginning-of-defun-p))
             (when (not (c-awk-beginning-of-defun 1)) ; No bo-defun before point.
               (goto-char start-point)
               (c-awk-beginning-of-defun -1))) ; if this fails, we're at EOB, tough!
         ;; Now count forward, one defun at a time
         (while (and (not (eobp))
                     (c-awk-end-of-defun1)
                     (if (> (point) start-point) (setq arg (1- arg)) t)
                     (> arg 0)
                     (c-awk-beginning-of-defun -1))))

       (when (< arg 0)
         (setq end-point start-point)
         (while (and (not (bobp))
                     (c-awk-beginning-of-defun 1)
                     (if (< (setq end-point (if (bobp) (point)
                                              (save-excursion (c-awk-end-of-defun1))))
                            start-point)
                         (setq arg (1+ arg)) t)
                     (< arg 0)))
         (goto-char (min start-point end-point)))))))

\f
(cc-provide 'cc-awk)			; Changed from 'awk-mode, ACM 2002/5/21

;; Local Variables:
;; indent-tabs-mode: t
;; tab-width: 8
;; End:
;;; awk-mode.el ends here

debug log:

solving 363ae481e2 ...
found 363ae481e2 in https://yhetil.org/emacs-devel/jwvzgyclhja.fsf-monnier+emacs@gnu.org/
found 3228944372 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 322894437256e9e7e99f05633875a9c442470b65	lisp/progmodes/cc-awk.el

applying [1/1] https://yhetil.org/emacs-devel/jwvzgyclhja.fsf-monnier+emacs@gnu.org/
diff --git a/lisp/progmodes/cc-awk.el b/lisp/progmodes/cc-awk.el
index 3228944372..363ae481e2 100644

Checking patch lisp/progmodes/cc-awk.el...
Applied patch lisp/progmodes/cc-awk.el cleanly.

index at:
100644 363ae481e2b2bc5033b543240421865715d5b15c	lisp/progmodes/cc-awk.el

(*) 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 public inbox

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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).