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