lisp/font-lock.el

   1 ;; Electric Font Lock Mode
   2 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   3
   4 ;; Author: jwz, then rms and sm <simon@gnu.ai.mit.edu>
   5 ;; Maintainer: FSF
   6 ;; Keywords: languages, faces
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Commentary:
  25
  26 ;; Font Lock mode is a minor mode that causes your comments to be displayed in
  27 ;; one face, strings in another, reserved words in another, and so on.
  28 ;;
  29 ;; Comments will be displayed in `font-lock-comment-face'.
  30 ;; Strings will be displayed in `font-lock-string-face'.
  31 ;; Regexps are used to display selected patterns in other faces.
  32 ;;
  33 ;; To make the text you type be fontified, use M-x font-lock-mode.
  34 ;; When this minor mode is on, the faces of the current line are
  35 ;; updated with every insertion or deletion.
  36 ;;
  37 ;; To turn Font Lock mode on automatically, add this to your .emacs file:
  38 ;;
  39 ;;  (add-hook 'emacs-lisp-mode-hook 'turn-on-font-lock)
  40 ;;
  41 ;; On a Sparc2, `font-lock-fontify-buffer' takes about 10 seconds for a 120k
  42 ;; file of C code using the default configuration, and about 25 seconds using
  43 ;; the more extensive configuration, though times also depend on file contents.
  44 ;; You can speed this up substantially by removing some of the patterns that
  45 ;; are highlighted by default.  Fontifying Lisp code is significantly faster,
  46 ;; because Lisp has a more regular syntax than C, so the expressions don't have
  47 ;; to be as hairy.
  48 ;;
  49 ;; If you add patterns for a new mode, say foo.el's `foo-mode', say in which
  50 ;; you don't want syntactic fontification to occur, you can make Font Lock mode
  51 ;; use your regexps when turning on Font Lock by adding to `foo-mode-hook':
  52 ;;
  53 ;;  (add-hook 'foo-mode-hook
  54 ;;   '(lambda () (make-local-variable 'font-lock-defaults)
  55 ;;               (setq font-lock-defaults '(foo-font-lock-keywords t))))
  56 ;;
  57 ;; Nasty regexps of the form "bar\\(\\|lo\\)\\|f\\(oo\\|u\\(\\|bar\\)\\)\\|lo"
  58 ;; are made thusly: (make-regexp '("foo" "fu" "fubar" "bar" "barlo" "lo")) for
  59 ;; efficiency.  See /pub/gnu/emacs/elisp-archive/functions/make-regexp.el.Z on
  60 ;; archive.cis.ohio-state.edu for this and other functions.
  61 \f
  62 ;;; Code:
  63
  64 (defvar font-lock-comment-face 'font-lock-comment-face
  65   "Face to use for comments.")
  66
  67 (defvar font-lock-string-face 'font-lock-string-face
  68   "Face to use for strings.")
  69
  70 (defvar font-lock-function-name-face 'font-lock-function-name-face
  71   "Face to use for function names.")
  72
  73 (defvar font-lock-variable-name-face 'font-lock-variable-name-face
  74   "Face to use for variable names.")
  75
  76 (defvar font-lock-keyword-face 'font-lock-keyword-face
  77   "Face to use for keywords.")
  78
  79 (defvar font-lock-type-face 'font-lock-type-face
  80   "Face to use for data types.")
  81
  82 (defvar font-lock-reference-face 'font-lock-reference-face
  83   "Face to use for references.")
  84
  85 (defvar font-lock-no-comments nil
  86   "Non-nil means Font Lock should not fontify comments or strings.")
  87
  88 (make-obsolete-variable 'font-lock-doc-string-face 'font-lock-string-face)
  89
  90 (make-variable-buffer-local 'font-lock-keywords)
  91 (defvar font-lock-keywords nil
  92   "*The keywords to highlight.
  93 Elements should be of the form:
  94
  95  MATCHER
  96  (MATCHER . MATCH)
  97  (MATCHER . FACENAME)
  98  (MATCHER . HIGHLIGHT)
  99  (MATCHER HIGHLIGHT ...)
 100
 101 where HIGHLIGHT should be of the form (MATCH FACENAME OVERRIDE LAXMATCH).
 102 MATCHER can be either the regexp to search for, or the function name to call to
 103 make the search (called with one argument, the limit of the search).  MATCH is
 104 the subexpression of MATCHER to be highlighted.  FACENAME is an expression
 105 whose value is the face name to use.  FACENAME's default attributes may be
 106 defined in `font-lock-face-attributes'.
 107
 108 OVERRIDE and LAXMATCH are flags.  If OVERRIDE is t, existing fontification may
 109 be overriden.  If `keep', only parts not already fontified are highlighted.
 110 If LAXMATCH is non-nil, no error is signalled if there is no MATCH in MATCHER.
 111
 112 These regular expressions should not match text which spans lines.  While
 113 \\[font-lock-fontify-buffer] handles multi-line patterns correctly, updating
 114 when you edit the buffer does not, since it considers text one line at a time.
 115
 116 Be careful composing regexps for this list;
 117 the wrong pattern can dramatically slow things down!")
 118
 119 (defvar font-lock-defaults nil
 120   "If set by a major mode, should be the defaults for Font Lock mode.
 121 The value should look like the `cdr' of an item in `font-lock-defaults-alist'.")
 122
 123 (defvar font-lock-defaults-alist
 124   (let ((tex-mode-defaults '(tex-font-lock-keywords nil nil ((?$ . "\""))))
 125         (c-mode-defaults
 126          '((c-font-lock-keywords c-font-lock-keywords-1 c-font-lock-keywords-2)
 127            nil nil ((?_ . "w"))))
 128         (c++-mode-defaults
 129          '((c++-font-lock-keywords c++-font-lock-keywords-1
 130                                    c++-font-lock-keywords-2)
 131            nil nil ((?_ . "w"))))
 132         (lisp-mode-defaults
 133          '((lisp-font-lock-keywords lisp-font-lock-keywords-1
 134                                     lisp-font-lock-keywords-2)
 135            nil nil ((?: . "w") (?- . "w") (?* . "w")))))
 136     (list
 137      (cons 'bibtex-mode         tex-mode-defaults)
 138      (cons 'c++-c-mode          c-mode-defaults)
 139      (cons 'c++-mode            c++-mode-defaults)
 140      (cons 'c-mode              c-mode-defaults)
 141      (cons 'emacs-lisp-mode     lisp-mode-defaults)
 142      (cons 'latex-mode          tex-mode-defaults)
 143      (cons 'lisp-mode           lisp-mode-defaults)
 144      (cons 'plain-tex-mode      tex-mode-defaults)
 145      (cons 'scheme-mode         lisp-mode-defaults)
 146      (cons 'slitex-mode         tex-mode-defaults)
 147      (cons 'tex-mode            tex-mode-defaults)))
 148   "*Alist of default major mode and Font Lock defaults.
 149 Each item should be a list of the form:
 150  (MAJOR-MODE . (FONT-LOCK-KEYWORDS KEYWORDS-ONLY CASE-FOLD FONT-LOCK-SYNTAX))
 151 where MAJOR-MODE is a symbol, and FONT-LOCK-KEYWORDS may be a symbol or a list
 152 of symbols.  If KEYWORDS-ONLY is non-nil, syntactic fontification (strings and
 153 comments) is not performed.  If CASE-FOLD is non-nil, the case of the keywords
 154 is ignored when fontifying.  FONT-LOCK-SYNTAX should be a list of cons pairs of
 155 the form (CHAR . STRING), it is used to set the local Font Lock syntax table
 156 for keyword fontification.")
 157
 158 (defvar font-lock-keywords-case-fold-search nil
 159   "*Non-nil means the patterns in `font-lock-keywords' are case-insensitive.")
 160
 161 (defvar font-lock-syntax-table nil
 162   "Non-nil means use this syntax table for fontifying.
 163 If this is nil, the major mode's syntax table is used.")
 164
 165 (defvar font-lock-verbose t
 166   "*Non-nil means `font-lock-fontify-buffer' should print status messages.")
 167
 168 ;;;###autoload
 169 (defvar font-lock-maximum-decoration nil
 170   "Non-nil means use the maximum decoration for fontifying.
 171 If nil, use the default decoration (typically the minimum available).
 172 If t, use the maximum decoration available.
 173 If a number, use that level of decoration (or if not available the maximum).")
 174
 175 (defvar font-lock-maximum-size
 176   (if font-lock-maximum-decoration (* 150 1024) (* 300 1024))
 177   "*If non-nil, the maximum size for buffers.
 178 Only buffers less than this can be fontified when Font Lock mode is turned on.
 179 If nil, means size is irrelevant.")
 180
 181 ;;;###autoload
 182 (defvar font-lock-mode-hook nil
 183   "Function or functions to run on entry to Font Lock mode.")
 184 \f
 185 ;; Colour etc. support.
 186
 187 (defvar font-lock-display-type nil
 188   "A symbol indicating the display Emacs is running under.
 189 The symbol should be one of `color', `grayscale' or `mono'.
 190 If Emacs guesses this display attribute wrongly, either set this variable in
 191 your `~/.emacs' or set the resource `Emacs.displayType' in your `~/.Xdefaults'.
 192 See also `font-lock-background-mode' and `font-lock-face-attributes'.")
 193
 194 (defvar font-lock-background-mode nil
 195   "A symbol indicating the Emacs background brightness.
 196 The symbol should be one of `light' or `dark'.
 197 If Emacs guesses this frame attribute wrongly, either set this variable in
 198 your `~/.emacs' or set the resource `Emacs.backgroundMode' in your
 199 `~/.Xdefaults'.
 200 See also `font-lock-display-type' and `font-lock-face-attributes'.")
 201
 202 (defvar font-lock-face-attributes nil
 203   "A list of default attributes to use for face attributes.
 204 Each element of the list should be of the form
 205
 206  (FACE FOREGROUND BACKGROUND BOLD-P ITALIC-P UNDERLINE-P)
 207
 208 where FACE should be one of the face symbols `font-lock-comment-face',
 209 `font-lock-string-face', `font-lock-keyword-face', `font-lock-type-face',
 210 `font-lock-function-name-face', `font-lock-variable-name-face', and
 211 `font-lock-reference-face'.  A form for each of these face symbols should be
 212 provided in the list, but other face symbols and attributes may be given and
 213 used in highlighting.  See `font-lock-keywords'.
 214
 215 Subsequent element items should be the attributes for the corresponding
 216 Font Lock mode faces.  Attributes FOREGROUND and BACKGROUND should be strings
 217 \(default if nil), while BOLD-P, ITALIC-P, and UNDERLINE-P should specify the
 218 corresponding face attributes (yes if non-nil).
 219
 220 Emacs uses default attributes based on display type and background brightness.
 221 See variables `font-lock-display-type' and `font-lock-background-mode'.
 222
 223 Resources can be used to over-ride these face attributes.  For example, the
 224 resource `Emacs.font-lock-comment-face.attributeUnderline' can be used to
 225 specify the UNDERLINE-P attribute for face `font-lock-comment-face'.")
 226
 227 (defun font-lock-make-faces (&optional override)
 228   "Make faces from `font-lock-face-attributes'.
 229 A default list is used if this is nil.
 230 If optional OVERRIDE is non-nil, faces that already exist are reset.
 231 See `font-lock-make-face' and `list-faces-display'."
 232   ;; We don't need to `setq' any of these variables, but the user can see what
 233   ;; is being used if we do.
 234   (if (null font-lock-display-type)
 235       (setq font-lock-display-type
 236             (let ((display-resource (x-get-resource ".displayType"
 237                                                     "DisplayType")))
 238               (cond (display-resource (intern (downcase display-resource)))
 239                     ((x-display-color-p) 'color)
 240                     ((x-display-grayscale-p) 'grayscale)
 241                     (t 'mono)))))
 242   (if (null font-lock-background-mode)
 243       (setq font-lock-background-mode
 244             (let ((bg-resource (x-get-resource ".backgroundMode"
 245                                                "BackgroundMode"))
 246                   (params (frame-parameters)))
 247               (cond (bg-resource (intern (downcase bg-resource)))
 248                     ((< (apply '+ (x-color-values
 249                                    (cdr (assq 'background-color params))))
 250                         (/ (apply '+ (x-color-values "white")) 3))
 251                      'dark)
 252                     (t 'light)))))
 253   (if (null font-lock-face-attributes)
 254       (setq font-lock-face-attributes
 255             (let ((light-bg (eq font-lock-background-mode 'light)))
 256               (cond ((memq font-lock-display-type '(mono monochrome))
 257                      ;; Emacs 19.25's font-lock defaults:
 258                      ;;'((font-lock-comment-face nil nil nil t nil)
 259                      ;;  (font-lock-string-face nil nil nil nil t)
 260                      ;;  (font-lock-keyword-face nil nil t nil nil)
 261                      ;;  (font-lock-function-name-face nil nil t t nil)
 262                      ;;  (font-lock-type-face nil nil nil t nil))
 263                      (list '(font-lock-comment-face nil nil t t nil)
 264                            '(font-lock-string-face nil nil nil t nil)
 265                            '(font-lock-keyword-face nil nil t nil nil)
 266                            (list
 267                             'font-lock-function-name-face
 268                             (cdr (assq 'background-color (frame-parameters)))
 269                             (cdr (assq 'foreground-color (frame-parameters)))
 270                             t nil nil)
 271                            '(font-lock-variable-name-face nil nil t t nil)
 272                            '(font-lock-type-face nil nil t nil t)
 273                            '(font-lock-reference-face nil nil t nil t)))
 274                     ((memq font-lock-display-type '(grayscale greyscale
 275                                                     grayshade greyshade))
 276                      (list
 277                       (list 'font-lock-comment-face
 278                             (if light-bg "DimGray" "Gray80") nil t t nil)
 279                       (list 'font-lock-string-face
 280                             (if light-bg "Gray50" "LightGray") nil nil t nil)
 281                       (list 'font-lock-keyword-face
 282                             (if light-bg "DimGray" "Gray90") nil t nil nil)
 283                       (list 'font-lock-function-name-face
 284                             (cdr (assq 'background-color (frame-parameters)))
 285                             (cdr (assq 'foreground-color (frame-parameters)))
 286                             t nil nil)
 287                       (list 'font-lock-variable-name-face
 288                             (if light-bg "DimGray" "Gray90") nil t t nil)
 289                       (list 'font-lock-type-face
 290                             (if light-bg "DimGray" "Gray80") nil t nil t)
 291                       (list 'font-lock-reference-face
 292                             (if light-bg "Gray50" "LightGray") nil t nil t)))
 293                     (light-bg           ; light colour background
 294                      '((font-lock-comment-face "Firebrick")
 295                        (font-lock-string-face "RosyBrown")
 296                        (font-lock-keyword-face "Purple")
 297                        (font-lock-function-name-face "Blue")
 298                        (font-lock-variable-name-face "DarkGoldenrod")
 299                        (font-lock-type-face "DarkOliveGreen")
 300                        (font-lock-reference-face "CadetBlue")))
 301                     (t                  ; dark colour background
 302                      '((font-lock-comment-face "OrangeRed")
 303                        (font-lock-string-face "LightSalmon")
 304                        (font-lock-keyword-face "LightSteelBlue")
 305                        (font-lock-function-name-face "LightSkyBlue")
 306                        (font-lock-variable-name-face "LightGoldenrod")
 307                        (font-lock-type-face "PaleGreen")
 308                        (font-lock-reference-face "Aquamarine")))))))
 309   ;; Now make the faces if we have to.
 310   (mapcar (function (lambda (face-attributes)
 311              (let ((face (nth 0 face-attributes)))
 312                (if (and (not override) (facep face))
 313                    ;; The face exists.  Only set the variable if it's nil.
 314                    (if (or (not (boundp face)) (symbol-value face))
 315                        (set face face))
 316                  ;; The face doesn't exist or we can stomp all over it anyway.
 317                  (font-lock-make-face face-attributes)))))
 318           font-lock-face-attributes))
 319
 320 (defun font-lock-make-face (face-attributes)
 321   "Make a face from FACE-ATTRIBUTES.
 322 FACE-ATTRIBUTES should be like an element `font-lock-face-attributes', so that
 323 the face name is the first item in the list.  A variable with the same name as
 324 the face is also set; its value is the face name."
 325   (let* ((face (nth 0 face-attributes))
 326          (face-name (symbol-name face))
 327          (set-p (function (lambda (face-name resource)
 328                  (x-get-resource (concat face-name ".attribute" resource)
 329                                  (concat "Face.Attribute" resource)))))
 330          (on-p (function (lambda (face-name resource)
 331                 (let ((set (funcall set-p face-name resource)))
 332                   (and set (member (downcase set) '("on" "true"))))))))
 333     (make-face face)
 334     ;; Set attributes not set from X resources (and therefore `make-face').
 335     (or (funcall set-p face-name "Foreground")
 336         (condition-case nil
 337             (set-face-foreground face (nth 1 face-attributes))
 338           (error nil)))
 339     (or (funcall set-p face-name "Background")
 340         (condition-case nil
 341             (set-face-background face (nth 2 face-attributes))
 342           (error nil)))
 343     (if (funcall set-p face-name "Bold")
 344         (and (funcall on-p face-name "Bold") (make-face-bold face nil t))
 345       (and (nth 3 face-attributes) (make-face-bold face nil t)))
 346     (if (funcall set-p face-name "Italic")
 347         (and (funcall on-p face-name "Italic") (make-face-italic face nil t))
 348       (and (nth 4 face-attributes) (make-face-italic face nil t)))
 349     (or (funcall set-p face-name "Underline")
 350         (set-face-underline-p face (nth 5 face-attributes)))
 351     (set face face)))
 352 \f
 353 ;; Fontification.
 354
 355 ;; These variables record, for each buffer, the parse state at a particular
 356 ;; position, always the start of a line.  Used to make font-lock-fontify-region
 357 ;; faster.
 358 (defvar font-lock-cache-position nil)
 359 (defvar font-lock-cache-state nil)
 360 (make-variable-buffer-local 'font-lock-cache-position)
 361 (make-variable-buffer-local 'font-lock-cache-state)
 362
 363 (defun font-lock-fontify-region (start end &optional loudly)
 364   "Put proper face on each string and comment between START and END."
 365   (save-excursion
 366     (save-restriction
 367       (widen)
 368       (goto-char start)
 369       (beginning-of-line)
 370       (if loudly (message "Fontifying %s... (syntactically...)" (buffer-name)))
 371       (let ((inhibit-read-only t) (buffer-undo-list t) (buffer-file-name)
 372             (modified (buffer-modified-p))
 373             (old-syntax (syntax-table))
 374             (synstart (if comment-start-skip
 375                           (concat "\\s\"\\|" comment-start-skip)
 376                         "\\s\""))
 377             (comstart (if comment-start-skip
 378                           (concat "\\s<\\|" comment-start-skip)
 379                         "\\s<"))
 380             (startline (point))
 381             state prev prevstate)
 382         (unwind-protect
 383             (progn
 384               (if font-lock-syntax-table
 385                   (set-syntax-table font-lock-syntax-table))
 386               ;; Find the state at the line-beginning before START.
 387               (if (eq startline font-lock-cache-position)
 388                   (setq state font-lock-cache-state)
 389                 ;; Find outermost containing sexp.
 390                 (beginning-of-defun)
 391                 ;; Find the state at STARTLINE.
 392                 (while (< (point) startline)
 393                   (setq state (parse-partial-sexp (point) startline 0)))
 394                 (setq font-lock-cache-state state
 395                       font-lock-cache-position (point)))
 396               ;; Now find the state precisely at START.
 397               (setq state (parse-partial-sexp (point) start nil nil state))
 398               ;; If the region starts inside a string, show the extent of it.
 399               (if (nth 3 state)
 400                   (let ((beg (point)))
 401                     (while (and (re-search-forward "\\s\"" end 'move)
 402                                 (nth 3 (parse-partial-sexp beg (point) nil nil
 403                                                            state))))
 404                     (put-text-property beg (point) 'face font-lock-string-face)
 405                     (setq state (parse-partial-sexp beg (point)
 406                                                     nil nil state))))
 407               ;; Likewise for a comment.
 408               (if (or (nth 4 state) (nth 7 state))
 409                   (let ((beg (point)))
 410                     (save-restriction
 411                       (narrow-to-region (point-min) end)
 412                       (condition-case nil
 413                           (progn
 414                             (re-search-backward comstart (point-min) 'move)
 415                             (forward-comment 1)
 416                             ;; forward-comment skips all whitespace,
 417                             ;; so go back to the real end of the comment.
 418                             (skip-chars-backward " \t"))
 419                         (error (goto-char end))))
 420                     (put-text-property beg (point) 'face
 421                                        font-lock-comment-face)
 422                     (setq state (parse-partial-sexp beg (point)
 423                                                     nil nil state))))
 424               ;; Find each interesting place between here and END.
 425               (while (and (< (point) end)
 426                           (setq prev (point) prevstate state)
 427                           (re-search-forward synstart end t)
 428                           (progn
 429                             ;; Clear out the fonts of what we skip over.
 430                             (remove-text-properties prev (point) '(face nil))
 431                             ;; Verify the state at that place
 432                             ;; so we don't get fooled by \" or \;.
 433                             (setq state (parse-partial-sexp prev (point)
 434                                                             nil nil state))))
 435                 (let ((here (point)))
 436                   (if (or (nth 4 state) (nth 7 state))
 437                       ;; We found a real comment start.
 438                       (let ((beg (match-beginning 0)))
 439                         (goto-char beg)
 440                         (save-restriction
 441                           (narrow-to-region (point-min) end)
 442                           (condition-case nil
 443                               (progn
 444                                 (forward-comment 1)
 445                                 ;; forward-comment skips all whitespace,
 446                                 ;; so go back to the real end of the comment.
 447                                 (skip-chars-backward " \t"))
 448                             (error (goto-char end))))
 449                         (put-text-property beg (point) 'face
 450                                            font-lock-comment-face)
 451                         (setq state (parse-partial-sexp here (point)
 452                                                         nil nil state)))
 453                     (if (nth 3 state)
 454                         (let ((beg (match-beginning 0)))
 455                           (while (and (re-search-forward "\\s\"" end 'move)
 456                                       (nth 3 (parse-partial-sexp
 457                                               here (point) nil nil state))))
 458                           (put-text-property beg (point) 'face
 459                                              font-lock-string-face)
 460                           (setq state (parse-partial-sexp here (point)
 461                                                           nil nil state))))))
 462                 ;; Make sure PREV is non-nil after the loop
 463                 ;; only if it was set on the very last iteration.
 464                 (setq prev nil)))
 465           (set-syntax-table old-syntax))
 466         (and prev
 467              (remove-text-properties prev end '(face nil)))
 468         (and (buffer-modified-p)
 469              (not modified)
 470              (set-buffer-modified-p nil))))))
 471
 472
 473 (defun font-lock-unfontify-region (beg end)
 474   (let ((modified (buffer-modified-p))
 475         (buffer-undo-list t) (inhibit-read-only t) (buffer-file-name))
 476     (remove-text-properties beg end '(face nil))
 477     (and (buffer-modified-p)
 478          (not modified)
 479          (set-buffer-modified-p nil))))
 480
 481 ;; Called when any modification is made to buffer text.
 482 (defun font-lock-after-change-function (beg end old-len)
 483   (save-excursion
 484     (save-match-data
 485       ;; Discard the cache info if text before it has changed.
 486       (and font-lock-cache-position
 487            (> font-lock-cache-position beg)
 488            (setq font-lock-cache-position nil))
 489       ;; Rescan between start of line from `beg' and start of line after `end'.
 490       (goto-char beg)
 491       (beginning-of-line)
 492       (setq beg (point))
 493       (goto-char end)
 494       (forward-line 1)
 495       (setq end (point))
 496       ;; First scan for strings and comments.
 497       ;; Must scan from line start in case of
 498       ;; inserting space into `intfoo () {}', and after widened.
 499       (if font-lock-no-comments
 500           (font-lock-unfontify-region beg end)
 501         (font-lock-fontify-region beg end))
 502       ;; Now scan for keywords.
 503       (font-lock-hack-keywords beg end))))
 504
 505 ;; The following must be rethought, since keywords can override fontification.
 506 ;      ;; Now scan for keywords, but not if we are inside a comment now.
 507 ;      (or (and (not font-lock-no-comments)
 508 ;              (let ((state (parse-partial-sexp beg end nil nil
 509 ;                                               font-lock-cache-state)))
 510 ;                (or (nth 4 state) (nth 7 state))))
 511 ;         (font-lock-hack-keywords beg end))
 512 \f
 513 ;;; Fontifying arbitrary patterns
 514
 515 (defun font-lock-compile-keywords (&optional keywords)
 516   ;; Compile `font-lock-keywords' into the form (t KEYWORD ...) where KEYWORD
 517   ;; is the (MATCHER HIGHLIGHT ...) shown in the variable's doc string.
 518   (let ((keywords (or keywords font-lock-keywords)))
 519     (setq font-lock-keywords
 520      (if (eq (car-safe keywords) t)
 521          keywords
 522        (cons t
 523         (mapcar
 524          (function (lambda (item)
 525             (cond ((nlistp item)
 526                    (list item '(0 font-lock-keyword-face)))
 527                   ((numberp (cdr item))
 528                    (list (car item) (list (cdr item) 'font-lock-keyword-face)))
 529                   ((symbolp (cdr item))
 530                    (list (car item) (list 0 (cdr item))))
 531                   ((nlistp (nth 1 item))
 532                    (list (car item) (cdr item)))
 533                   (t
 534                    item))))
 535          keywords))))))
 536
 537 (defsubst font-lock-apply-highlight (highlight)
 538   "Apply HIGHLIGHT following a match.  See `font-lock-keywords'."
 539   (let* ((match (nth 0 highlight))
 540          (beg (match-beginning match)) (end (match-end match))
 541          (override (nth 2 highlight)))
 542     (cond ((not beg)
 543            ;; No match but we might not signal an error
 544            (or (nth 3 highlight) (error "Highlight %S failed" highlight)))
 545           ((and (not override) (text-property-not-all beg end 'face nil))
 546            ;; Can't override and already fontified
 547            nil)
 548           ((not (eq override 'keep))
 549            ;; Can override but need not keep existing fontification
 550            (put-text-property beg end 'face (eval (nth 1 highlight))))
 551           (t
 552            ;; Can override but must keep existing fontification
 553            (let ((pos (text-property-any beg end 'face nil)) next
 554                  (face (eval (nth 1 highlight))))
 555              (while pos
 556                (setq next (next-single-property-change pos 'face nil end))
 557                (put-text-property pos next 'face face)
 558                (setq pos (text-property-any next end 'face nil))))))))
 559
 560 (defun font-lock-hack-keywords (start end &optional loudly)
 561   "Fontify according to `font-lock-keywords' between START and END."
 562   (let ((case-fold-search font-lock-keywords-case-fold-search)
 563         (keywords (cdr (if (eq (car-safe font-lock-keywords) t)
 564                            font-lock-keywords
 565                          (font-lock-compile-keywords))))
 566         (count 0)
 567         (inhibit-read-only t) (buffer-undo-list t) (buffer-file-name)
 568         (modified (buffer-modified-p))
 569         (old-syntax (syntax-table))
 570         (bufname (buffer-name)))
 571     (unwind-protect
 572         (let (keyword matcher highlights)
 573           (if loudly (message "Fontifying %s... (regexps...)" bufname))
 574           (if font-lock-syntax-table (set-syntax-table font-lock-syntax-table))
 575           (while keywords
 576             (setq keyword (car keywords) keywords (cdr keywords)
 577                   matcher (car keyword) highlights (cdr keyword))
 578             (goto-char start)
 579             (while (if (stringp matcher)
 580                        (re-search-forward matcher end t)
 581                      (funcall matcher end))
 582               (mapcar 'font-lock-apply-highlight highlights))
 583             (if loudly (message "Fontifying %s... (regexps...%s)" bufname
 584                                 (make-string (setq count (1+ count)) ?.)))))
 585       (set-syntax-table old-syntax))
 586     (and (buffer-modified-p)
 587          (not modified)
 588          (set-buffer-modified-p nil))))
 589 \f
 590 ;; The user level functions
 591
 592 (defvar font-lock-mode nil) ; for modeline
 593
 594 (defvar font-lock-fontified nil) ; whether we have hacked this buffer
 595 (put 'font-lock-fontified 'permanent-local t)
 596
 597 ;;;###autoload
 598 (defun font-lock-mode (&optional arg)
 599   "Toggle Font Lock mode.
 600 With arg, turn Font Lock mode on if and only if arg is positive.
 601
 602 When Font Lock mode is enabled, text is fontified as you type it:
 603
 604  - Comments are displayed in `font-lock-comment-face';
 605  - Strings are displayed in `font-lock-string-face';
 606  - Certain other expressions are displayed in other faces according to the
 607    value of the variable `font-lock-keywords'.
 608
 609 You can enable Font Lock mode in any major mode automatically by turning on in
 610 the major mode's hook.  For example, put in your ~/.emacs:
 611
 612  (add-hook 'c-mode-hook 'turn-on-font-lock)
 613
 614 Or for any visited file with the following in your ~/.emacs:
 615
 616  (add-hook 'find-file-hooks 'turn-on-font-lock)
 617
 618 The default Font Lock mode faces and their attributes are defined in the
 619 variable `font-lock-face-attributes', and Font Lock mode default settings in
 620 the variable `font-lock-defaults-alist'.
 621
 622 Where modes support different levels of fontification, you can use the variable
 623 `font-lock-maximum-decoration' to specify which level you generally prefer.
 624 When you turn Font Lock mode on/off the buffer is fontified/defontified, though
 625 fontification occurs only if the buffer is less than `font-lock-maximum-size'.
 626 To fontify a buffer without turning on Font Lock mode, and regardless of buffer
 627 size, you can use \\[font-lock-fontify-buffer]."
 628   (interactive "P")
 629   (let ((on-p (if arg (> (prefix-numeric-value arg) 0) (not font-lock-mode))))
 630     (if (equal (buffer-name) " *Compiler Input*") ; hack for bytecomp...
 631         (setq on-p nil))
 632     (if (not on-p)
 633         (remove-hook 'after-change-functions 'font-lock-after-change-function)
 634       (make-local-variable 'after-change-functions)
 635       (add-hook 'after-change-functions 'font-lock-after-change-function))
 636     (set (make-local-variable 'font-lock-mode) on-p)
 637     (cond (on-p
 638            (font-lock-set-defaults)
 639            (make-local-variable 'before-revert-hook)
 640            (make-local-variable 'after-revert-hook)
 641            ;; If buffer is reverted, must clean up the state.
 642            (add-hook 'before-revert-hook 'font-lock-revert-setup)
 643            (add-hook 'after-revert-hook 'font-lock-revert-cleanup)
 644            (run-hooks 'font-lock-mode-hook)
 645            (cond (font-lock-fontified
 646                   nil)
 647                  ((or (null font-lock-maximum-size)
 648                       (> font-lock-maximum-size (buffer-size)))
 649                   (font-lock-fontify-buffer))
 650                  (font-lock-verbose
 651                   (message "Fontifying %s... buffer too big." (buffer-name)))))
 652           (font-lock-fontified
 653            (setq font-lock-fontified nil)
 654            (remove-hook 'before-revert-hook 'font-lock-revert-setup)
 655            (remove-hook 'after-revert-hook 'font-lock-revert-cleanup)
 656            (font-lock-unfontify-region (point-min) (point-max))
 657            (font-lock-thing-lock-cleanup))
 658           (t
 659            (remove-hook 'before-revert-hook 'font-lock-revert-setup)
 660            (remove-hook 'after-revert-hook 'font-lock-revert-cleanup)
 661            (font-lock-thing-lock-cleanup)))
 662     (force-mode-line-update)))
 663
 664 ;;;###autoload
 665 (defun turn-on-font-lock ()
 666   "Unconditionally turn on Font Lock mode."
 667   (font-lock-mode 1))
 668
 669 ;; Turn off other related packages if they're on.  I prefer a hook.
 670 ;; These explicit calls are easier to understand
 671 ;; because people know what they will do.
 672 ;; A hook is a mystery because it might do anything whatever. -- rms.
 673 (defun font-lock-thing-lock-cleanup ()
 674   (cond ((and (boundp 'fast-lock-mode) fast-lock-mode)
 675          (fast-lock-mode -1))
 676         ((and (boundp 'lazy-lock-mode) lazy-lock-mode)
 677          (lazy-lock-mode -1))))
 678
 679 ;; Do something special for these packages after fontifying.  I prefer a hook.
 680 (defun font-lock-after-fontify-buffer ()
 681   (cond ((and (boundp 'fast-lock-mode) fast-lock-mode)
 682          (fast-lock-after-fontify-buffer))
 683         ((and (boundp 'lazy-lock-mode) lazy-lock-mode)
 684          (lazy-lock-after-fontify-buffer))))
 685
 686 ;; If the buffer is about to be reverted, it won't be fontified afterward.
 687 (defun font-lock-revert-setup ()
 688   (setq font-lock-fontified nil))
 689
 690 ;; If the buffer has just been reverted, normally that turns off
 691 ;; Font Lock mode.  So turn the mode back on if necessary.
 692 (defun font-lock-revert-cleanup ()
 693   (font-lock-mode 1))
 694
 695 ;;;###autoload
 696 (defun font-lock-fontify-buffer ()
 697   "Fontify the current buffer the way `font-lock-mode' would."
 698   (interactive)
 699   (let ((was-on font-lock-mode)
 700         (verbose (and (or font-lock-verbose (interactive-p))
 701                       (not (zerop (buffer-size)))))
 702         (modified (buffer-modified-p)))
 703     (set (make-local-variable 'font-lock-fontified) nil)
 704     (if verbose (message "Fontifying %s..." (buffer-name)))
 705     ;; Turn it on to run hooks and get the right `font-lock-keywords' etc.
 706     (or was-on (font-lock-set-defaults))
 707     (condition-case nil
 708         (save-excursion
 709           (if font-lock-no-comments
 710               (font-lock-unfontify-region (point-min) (point-max))
 711             (font-lock-fontify-region (point-min) (point-max) verbose))
 712           (font-lock-hack-keywords (point-min) (point-max) verbose)
 713           (setq font-lock-fontified t))
 714       ;; We don't restore the old fontification, so it's best to unfontify.
 715       (quit (font-lock-unfontify-region (point-min) (point-max))))
 716     (if verbose (message "Fontifying %s... %s." (buffer-name)
 717                          (if font-lock-fontified "done" "aborted")))
 718     (and (buffer-modified-p)
 719          (not modified)
 720          (set-buffer-modified-p nil))
 721     (font-lock-after-fontify-buffer)))
 722 \f
 723 ;;; Various information shared by several modes.
 724 ;;; Information specific to a single mode should go in its load library.
 725
 726 (defconst lisp-font-lock-keywords-1
 727   (list
 728    ;; highlight defining forms.  This doesn't work too nicely for
 729    ;; (defun (setf foo) ...) but it does work for (defvar foo) which
 730    ;; is more important.
 731    (list (concat "^(\\(def\\(const\\|ine-key\\(\\|-after\\)\\|var\\)\\)\\>"
 732                  "[ \t']*\\([^ \t\n\(\)]+\\)?")
 733          '(1 font-lock-keyword-face) '(4 font-lock-variable-name-face nil t))
 734    (list (concat "^(\\(def[^ \t\n\(\)]+\\|eval-"
 735                  "\\(a\\(fter-load\\|nd-compile\\)\\|when-compile\\)\\)\\>"
 736                  "[ \t']*\\([^ \t\n\(\)]+\\)?")
 737          '(1 font-lock-keyword-face) '(4 font-lock-function-name-face nil t))
 738    )
 739  "Subdued level highlighting Lisp modes.")
 740
 741 (defconst lisp-font-lock-keywords-2
 742   (append lisp-font-lock-keywords-1
 743    (let ((word-char "[-+a-zA-Z0-9_:*]"))
 744      (list
 745       ;;
 746       ;; Control structures.
 747       ;; ELisp:
 748 ;    ("cond" "if" "while" "let\\*?" "prog[nv12*]?" "catch" "throw"
 749 ;     "save-restriction" "save-excursion" "save-window-excursion"
 750 ;     "save-selected-window" "save-match-data" "unwind-protect"
 751 ;     "condition-case" "track-mouse")
 752       (cons
 753        (concat
 754         "(\\("
 755         "c\\(atch\\|ond\\(\\|ition-case\\)\\)\\|if\\|let\\*?\\|prog[nv12*]?\\|"
 756         "save-\\(excursion\\|match-data\\|restriction\\|"
 757         "selected-window\\|window-excursion\\)\\|"
 758         "t\\(hrow\\|rack-mouse\\)\\|unwind-protect\\|while"
 759         "\\)\\>") 1)
 760       ;; CLisp:
 761 ;    ("when" "unless" "do" "flet" "labels" "return" "return-from")
 762       '("(\\(do\\|flet\\|labels\\|return\\(\\|-from\\)\\|unless\\|when\\)\\>"
 763         . 1)
 764       ;;
 765       ;; Fontify CLisp keywords.
 766       (concat "\\<:" word-char "+\\>")
 767       ;;
 768       ;; Function names in emacs-lisp docstrings (in the syntax that
 769       ;; `substitute-command-keys' understands).
 770       (list (concat "\\\\\\\\\\[\\(" word-char "+\\)]")
 771             1 font-lock-reference-face t)
 772       ;;
 773       ;; Words inside `' which tend to be symbol names.
 774       (list (concat "`\\(" word-char word-char "+\\)'")
 775             1 'font-lock-reference-face t)
 776       ;;
 777       ;; & keywords as types
 778       '("\\&\\(optional\\|rest\\|whole\\)\\>" . font-lock-type-face)
 779       )))
 780   "Gaudy level highlighting for Lisp modes.")
 781
 782 (defvar lisp-font-lock-keywords lisp-font-lock-keywords-1
 783   "Default expressions to highlight in Lisp modes.")
 784
 785
 786 (defconst c-font-lock-keywords-1 nil
 787   "Subdued level highlighting for C modes.")
 788
 789 (defconst c-font-lock-keywords-2 nil
 790   "Gaudy level highlighting for C modes.")
 791
 792 (defconst c++-font-lock-keywords-1 nil
 793   "Subdued level highlighting for C++ modes.")
 794
 795 (defconst c++-font-lock-keywords-2 nil
 796   "Gaudy level highlighting for C++ modes.")
 797
 798 (let ((c-keywords
 799 ;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while")
 800        "break\\|continue\\|do\\|else\\|for\\|if\\|return\\|switch\\|while")
 801       (c-type-types
 802 ;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
 803 ;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
 804 ;       "void" "volatile" "const")
 805        (concat "auto\\|c\\(har\\|onst\\)\\|double\\|e\\(num\\|xtern\\)\\|"
 806                "float\\|int\\|long\\|register\\|"
 807                "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|typedef\\|"
 808                "un\\(ion\\|signed\\)\\|vo\\(id\\|latile\\)"))   ; 6 ()s deep.
 809       (c++-keywords
 810 ;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while"
 811 ;       "asm" "catch" "delete" "new" "operator" "sizeof" "this" "throw" "try"
 812 ;       "protected" "private" "public")
 813        (concat "asm\\|break\\|c\\(atch\\|ontinue\\)\\|d\\(elete\\|o\\)\\|"
 814                "else\\|for\\|if\\|new\\|operator\\|"
 815                "p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\|return\\|"
 816                "s\\(izeof\\|witch\\)\\|t\\(h\\(is\\|row\\)\\|ry\\)\\|while"))
 817       (c++-type-types
 818 ;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
 819 ;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
 820 ;       "void" "volatile" "const" "class" "inline" "friend" "bool"
 821 ;       "virtual" "complex" "template")
 822        (concat "auto\\|bool\\|c\\(har\\|lass\\|o\\(mplex\\|nst\\)\\)\\|"
 823                "double\\|e\\(num\\|xtern\\)\\|f\\(loat\\|riend\\)\\|"
 824                "in\\(line\\|t\\)\\|long\\|register\\|"
 825                "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|"
 826                "t\\(emplate\\|ypedef\\)\\|un\\(ion\\|signed\\)\\|"
 827                "v\\(irtual\\|o\\(id\\|latile\\)\\)"))           ; 11 ()s deep.
 828       (ctoken "[a-zA-Z0-9_:~]+"))
 829  (setq c-font-lock-keywords-1
 830   (list
 831    ;;
 832    ;; Fontify filenames in #include <...> preprocessor directives.
 833    '("^#[ \t]*include[ \t]+\\(<[^>\"\n]+>\\)" 1 font-lock-string-face)
 834    ;;
 835    ;; Fontify function macro names.
 836    '("^#[ \t]*define[ \t]+\\(\\(\\sw+\\)(\\)" 2 font-lock-function-name-face)
 837    ;;
 838    ;; Fontify otherwise as symbol names, and the preprocessor directive names.
 839    '("^\\(#[ \t]*[a-z]+\\)\\>[ \t]*\\(\\sw+\\)?"
 840      (1 font-lock-reference-face) (2 font-lock-variable-name-face nil t))
 841    ;;
 842    ;; Fontify function name definitions (without type on line).
 843    (list (concat "^\\(" ctoken "\\)[ \t]*(") 1 'font-lock-function-name-face)
 844    ))
 845
 846  (setq c-font-lock-keywords-2
 847   (append c-font-lock-keywords-1
 848    (list
 849     ;;
 850     ;; Fontify all storage classes and type specifiers (before declarations).
 851     (cons (concat "\\<\\(" c-type-types "\\)\\>") 'font-lock-type-face)
 852     ;;
 853     ;; Fontify variable/structure name declarations and definitions, or
 854     ;; function name declarations (plus definitions with type on same line).
 855     (list (concat "\\<\\(" c-type-types "\\)[ \t*]+"
 856                   "\\(" ctoken "[ \t*]+\\)*"
 857                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
 858           9
 859           '(if (match-beginning 10)
 860                font-lock-function-name-face
 861              font-lock-variable-name-face))
 862     ;;
 863     ;; Fontify function/variable name declarations at the start of the line.
 864     ;; (Not everyone follows the GNU convention of function name at the start.)
 865     (list (concat "^" ctoken "[ \t*]+"
 866                   "\\(" ctoken "[ \t*]+\\)*"
 867                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
 868           2
 869           '(if (match-beginning 3)
 870                font-lock-function-name-face
 871              font-lock-variable-name-face))
 872     ;;
 873     ;; Fontify variable names declared with structures, or typedef names.
 874     '("}[ \t*]*\\(\\sw+\\)[ \t]*[;,[]" 1 font-lock-variable-name-face)
 875     ;;
 876     ;; Fontify all builtin keywords (except case, default and goto; see below).
 877     (concat "\\<\\(" c-keywords "\\)\\>")
 878     ;;
 879     ;; Fontify case/goto keywords and targets, and goto tags (incl "default:").
 880     '("\\<\\(case\\|goto\\)\\>[ \t]*\\([^ \t\n:;]+\\)?"
 881       (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
 882     '("^[ \t]*\\(\\sw+\\)[ \t]*:" 1 font-lock-reference-face)
 883     )))
 884
 885  (setq c++-font-lock-keywords-1 c-font-lock-keywords-1)
 886  (setq c++-font-lock-keywords-2
 887   (append c++-font-lock-keywords-1
 888    (list
 889     ;; We don't just add to the C keywords for subtle differences and speed.
 890     ;; See the above comments for `c-font-lock-keywords-2'.
 891     (cons (concat "\\<\\(" c++-type-types "\\)\\>") 'font-lock-type-face)
 892     (list (concat "\\<\\(" c++-type-types "\\)[ \t*&]+"
 893                   "\\(" ctoken "[ \t*&]+\\)*"
 894                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
 895           14
 896           '(if (match-beginning 15)
 897                font-lock-function-name-face
 898              font-lock-variable-name-face))
 899     (list (concat "^" ctoken "[ \t*]+"
 900                   "\\(" ctoken "[ \t*]+\\)*"
 901                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
 902           2
 903           '(if (match-beginning 3)
 904                font-lock-function-name-face
 905              font-lock-variable-name-face))
 906     '("}[ \t*]*\\(\\sw+\\)[ \t]*[;,[]" 1 font-lock-variable-name-face)
 907     (concat "\\<\\(" c++-keywords "\\)\\>")
 908     '("\\<\\(case\\|goto\\)\\>[ \t]*\\([^ \t\n:;]+\\)?"
 909       (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
 910     '("^[ \t]*\\(\\sw+\\)[ \t]*:[^:]" 1 font-lock-reference-face))))
 911  )
 912
 913 (defvar c-font-lock-keywords c-font-lock-keywords-1
 914   "Default expressions to highlight in C mode.")
 915
 916 (defvar c++-font-lock-keywords c++-font-lock-keywords-1
 917   "Default expressions to highlight in C++ mode.")
 918
 919 (defvar tex-font-lock-keywords
 920   ;; Regexps updated with help from Ulrik Dickow <dickow@nbi.dk>.
 921   '(("\\\\\\(begin\\|end\\|newcommand\\){\\([a-zA-Z0-9\\*]+\\)}"
 922      2 font-lock-function-name-face)
 923     ("\\\\\\(cite\\|label\\|pageref\\|ref\\){\\([^} \t\n]+\\)}"
 924      2 font-lock-reference-face)
 925     ;; It seems a bit dubious to use `bold' and `italic' faces since we might
 926     ;; not be able to display those fonts.
 927     ("{\\\\bf\\([^}]+\\)}" 1 'bold keep)
 928     ("{\\\\\\(em\\|it\\|sl\\)\\([^}]+\\)}" 2 'italic keep)
 929     ("\\\\\\([a-zA-Z@]+\\|.\\)" . font-lock-keyword-face)
 930     ("^[ \t\n]*\\\\def[\\\\@]\\(\\w+\\)" 1 font-lock-function-name-face keep))
 931   "Additional expressions to highlight in TeX mode.")
 932
 933 (defun font-lock-choose-keywords (keywords level)
 934   ;; Return evaled LEVELth element of KEYWORDS.  A LEVEL of nil is equal to a
 935   ;; LEVEL of 0, a LEVEL of t is equal to (1- (length KEYWORDS)).
 936   (eval (cond ((symbolp keywords)
 937                keywords)
 938               ((numberp level)
 939                (or (nth level keywords) (car (reverse keywords))))
 940               ((eq level t)
 941                (car (reverse keywords)))
 942               (t
 943                (car keywords)))))
 944
 945 (defun font-lock-set-defaults ()
 946   "Set fontification defaults appropriately for this mode.
 947 Sets `font-lock-keywords', `font-lock-no-comments', `font-lock-syntax-table'
 948 and `font-lock-keywords-case-fold-search' using `font-lock-defaults' (or, if
 949 nil, using `font-lock-defaults-alist') and `font-lock-maximum-decoration'."
 950   ;; Set face defaults.
 951   (font-lock-make-faces)
 952   ;; Set fontification defaults.
 953   (or font-lock-keywords
 954       (let ((defaults (or font-lock-defaults
 955                           (cdr (assq major-mode font-lock-defaults-alist)))))
 956         ;; Keywords?
 957         (setq font-lock-keywords (font-lock-choose-keywords (nth 0 defaults)
 958                                   font-lock-maximum-decoration))
 959         ;; Syntactic?
 960         (if (nth 1 defaults)
 961             (set (make-local-variable 'font-lock-no-comments) t))
 962         ;; Case fold?
 963         (if (nth 2 defaults)
 964             (set (make-local-variable 'font-lock-keywords-case-fold-search) t))
 965         ;; Syntax table?
 966         (if (nth 3 defaults)
 967             (let ((slist (nth 3 defaults)))
 968               (set (make-local-variable 'font-lock-syntax-table)
 969                    (copy-syntax-table (syntax-table)))
 970               (while slist
 971                 (modify-syntax-entry (car (car slist)) (cdr (car slist))
 972                                      font-lock-syntax-table)
 973                 (setq slist (cdr slist))))))))
 974
 975 ;; Install ourselves:
 976
 977 (or (assq 'font-lock-mode minor-mode-alist)
 978     (setq minor-mode-alist (cons '(font-lock-mode " Font") minor-mode-alist)))
 979
 980 ;; Provide ourselves:
 981
 982 (provide 'font-lock)
 983
 984 ;;; font-lock.el ends here