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 (make-variable-buffer-local 'font-lock-keywords)
  86 (defvar font-lock-keywords nil
  87   "*A list of the keywords to highlight.
  88 Each element should be of the form:
  89
  90  MATCHER
  91  (MATCHER . MATCH)
  92  (MATCHER . FACENAME)
  93  (MATCHER . HIGHLIGHT)
  94  (MATCHER HIGHLIGHT ...)
  95
  96 where HIGHLIGHT should be of the form (MATCH FACENAME OVERRIDE LAXMATCH).
  97 MATCHER can be either the regexp to search for, or the function name to call to
  98 make the search (called with one argument, the limit of the search).  MATCH is
  99 the subexpression of MATCHER to be highlighted.  FACENAME is an expression
 100 whose value is the face name to use.  FACENAME's default attributes may be
 101 defined in `font-lock-face-attributes'.
 102
 103 OVERRIDE and LAXMATCH are flags.  If OVERRIDE is t, existing fontification may
 104 be overriden.  If `keep', only parts not already fontified are highlighted.
 105 If LAXMATCH is non-nil, no error is signalled if there is no MATCH in MATCHER.
 106
 107 These regular expressions should not match text which spans lines.  While
 108 \\[font-lock-fontify-buffer] handles multi-line patterns correctly, updating
 109 when you edit the buffer does not, since it considers text one line at a time.
 110
 111 Be careful composing regexps for this list;
 112 the wrong pattern can dramatically slow things down!")
 113
 114 (defvar font-lock-defaults nil
 115   "If set by a major mode, should be the defaults for Font Lock mode.
 116 The value should look like the `cdr' of an item in `font-lock-defaults-alist'.")
 117
 118 (defvar font-lock-defaults-alist
 119   (let (
 120         ;; For C and Lisp modes we use `beginning-of-defun', rather than nil,
 121         ;; for SYNTAX-BEGIN.  Thus the calculation of the cache is faster but
 122         ;; not infallible, so we risk mis-fontification.  --sm
 123         (c-mode-defaults
 124          '((c-font-lock-keywords c-font-lock-keywords-1 c-font-lock-keywords-2)
 125            nil nil ((?\_ . "w")) beginning-of-defun))
 126         (c++-mode-defaults
 127          '((c++-font-lock-keywords c++-font-lock-keywords-1
 128                                    c++-font-lock-keywords-2)
 129            nil nil ((?\_ . "w")) beginning-of-defun))
 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            beginning-of-defun))
 135         (scheme-mode-defaults
 136          '(scheme-font-lock-keywords
 137            nil nil ((?\: . "w") (?\- . "w") (?\* . "w") (?\/ . "w"))
 138            beginning-of-defun))
 139         ;; For TeX modes we could use `backward-paragraph' for the same reason.
 140         (tex-mode-defaults '(tex-font-lock-keywords nil nil ((?\$ . "\""))))
 141         )
 142     (list
 143      (cons 'bibtex-mode                 tex-mode-defaults)
 144      (cons 'c++-c-mode                  c-mode-defaults)
 145      (cons 'c++-mode                    c++-mode-defaults)
 146      (cons 'c-mode                      c-mode-defaults)
 147      (cons 'emacs-lisp-mode             lisp-mode-defaults)
 148      (cons 'inferior-scheme-mode        scheme-mode-defaults)
 149      (cons 'latex-mode                  tex-mode-defaults)
 150      (cons 'lisp-mode                   lisp-mode-defaults)
 151      (cons 'lisp-interaction-mode       lisp-mode-defaults)
 152      (cons 'plain-tex-mode              tex-mode-defaults)
 153      (cons 'scheme-mode                 scheme-mode-defaults)
 154      (cons 'scheme-interaction-mode     scheme-mode-defaults)
 155      (cons 'slitex-mode                 tex-mode-defaults)
 156      (cons 'tex-mode                    tex-mode-defaults)))
 157   "*Alist of default major mode and Font Lock defaults.
 158 Each item should be a list of the form:
 159
 160  (MAJOR-MODE . (KEYWORDS KEYWORDS-ONLY CASE-FOLD SYNTAX-ALIST SYNTAX-BEGIN))
 161
 162 where MAJOR-MODE is a symbol, and KEYWORDS may be a symbol or a list of
 163 symbols.  If KEYWORDS-ONLY is non-nil, syntactic fontification (strings and
 164 comments) is not performed.  If CASE-FOLD is non-nil, the case of the keywords
 165 is ignored when fontifying.  If SYNTAX-ALIST is non-nil, it should be a list of
 166 cons pairs of the form (CHAR . STRING) used to set the local Font Lock syntax
 167 table for keyword and syntactic fontification.  (See `modify-syntax-entry'.)
 168
 169 SYNTAX-BEGIN should be a function, it is called with no args to move outside of
 170 a syntactic block for syntactic fontification.  Typical values are nil
 171 \(equivalent to `beginning-of-buffer'), `beginning-of-line' (i.e., the start of
 172 the line is known to be outside a syntactic block), or `beginning-of-defun' for
 173 programming modes or `backward-paragraph' for textual modes (i.e., the
 174 mode-dependent function is known to move outside a syntactic block).
 175
 176 These item elements are used by Font Lock mode to set the variables
 177 `font-lock-keywords', `font-lock-no-comments',
 178 `font-lock-keywords-case-fold-search', `font-lock-syntax-table' and
 179 `font-lock-beginning-of-syntax-function', respectively.")
 180
 181 (defvar font-lock-no-comments nil
 182   "*Non-nil means Font Lock should not fontify comments or strings.
 183 This is normally set via `font-lock-defaults'.")
 184
 185 (defvar font-lock-keywords-case-fold-search nil
 186   "*Non-nil means the patterns in `font-lock-keywords' are case-insensitive.
 187 This is normally set via `font-lock-defaults'.")
 188
 189 (defvar font-lock-syntax-table nil
 190   "Non-nil means use this syntax table for fontifying.
 191 If this is nil, the major mode's syntax table is used.
 192 This is normally set via `font-lock-defaults'.")
 193
 194 (defvar font-lock-beginning-of-syntax-function nil
 195   "*Non-nil means use this function to move outside of a syntactic block.
 196 If this is nil, `beginning-of-buffer' is used.
 197 This is normally set via `font-lock-defaults'.")
 198
 199 (defvar font-lock-verbose t
 200   "*Non-nil means `font-lock-fontify-buffer' should print status messages.")
 201
 202 ;;;###autoload
 203 (defvar font-lock-maximum-decoration nil
 204   "*If non-nil, the maximum decoration for fontifying.
 205 If nil, use the default decoration (typically the minimum available).
 206 If t, use the maximum decoration available.
 207 If a number, use that level of decoration (or if not available the maximum).")
 208
 209 ;;;###autoload
 210 (defvar font-lock-maximum-size
 211   (if font-lock-maximum-decoration (* 150 1024) (* 300 1024))
 212   "*If non-nil, the maximum size for buffers for fontifying.
 213 Only buffers less than this can be fontified when Font Lock mode is turned on.
 214 If nil, means size is irrelevant.")
 215
 216 ;;;###autoload
 217 (defvar font-lock-mode-hook nil
 218   "Function or functions to run on entry to Font Lock mode.")
 219 \f
 220 ;; Colour etc. support.
 221
 222 (defvar font-lock-display-type nil
 223   "A symbol indicating the display Emacs is running under.
 224 The symbol should be one of `color', `grayscale' or `mono'.
 225 If Emacs guesses this display attribute wrongly, either set this variable in
 226 your `~/.emacs' or set the resource `Emacs.displayType' in your `~/.Xdefaults'.
 227 See also `font-lock-background-mode' and `font-lock-face-attributes'.")
 228
 229 (defvar font-lock-background-mode nil
 230   "A symbol indicating the Emacs background brightness.
 231 The symbol should be one of `light' or `dark'.
 232 If Emacs guesses this frame attribute wrongly, either set this variable in
 233 your `~/.emacs' or set the resource `Emacs.backgroundMode' in your
 234 `~/.Xdefaults'.
 235 See also `font-lock-display-type' and `font-lock-face-attributes'.")
 236
 237 (defvar font-lock-face-attributes nil
 238   "A list of default attributes to use for face attributes.
 239 Each element of the list should be of the form
 240
 241  (FACE FOREGROUND BACKGROUND BOLD-P ITALIC-P UNDERLINE-P)
 242
 243 where FACE should be one of the face symbols `font-lock-comment-face',
 244 `font-lock-string-face', `font-lock-keyword-face', `font-lock-type-face',
 245 `font-lock-function-name-face', `font-lock-variable-name-face', and
 246 `font-lock-reference-face'.  A form for each of these face symbols should be
 247 provided in the list, but other face symbols and attributes may be given and
 248 used in highlighting.  See `font-lock-keywords'.
 249
 250 Subsequent element items should be the attributes for the corresponding
 251 Font Lock mode faces.  Attributes FOREGROUND and BACKGROUND should be strings
 252 \(default if nil), while BOLD-P, ITALIC-P, and UNDERLINE-P should specify the
 253 corresponding face attributes (yes if non-nil).
 254
 255 Emacs uses default attributes based on display type and background brightness.
 256 See variables `font-lock-display-type' and `font-lock-background-mode'.
 257
 258 Resources can be used to over-ride these face attributes.  For example, the
 259 resource `Emacs.font-lock-comment-face.attributeUnderline' can be used to
 260 specify the UNDERLINE-P attribute for face `font-lock-comment-face'.")
 261
 262 (defun font-lock-make-faces (&optional override)
 263   "Make faces from `font-lock-face-attributes'.
 264 A default list is used if this is nil.
 265 If optional OVERRIDE is non-nil, faces that already exist are reset.
 266 See `font-lock-make-face' and `list-faces-display'."
 267   ;; We don't need to `setq' any of these variables, but the user can see what
 268   ;; is being used if we do.
 269   (if (null font-lock-display-type)
 270       (setq font-lock-display-type
 271             (let ((display-resource (x-get-resource ".displayType"
 272                                                     "DisplayType")))
 273               (cond (display-resource (intern (downcase display-resource)))
 274                     ((x-display-color-p) 'color)
 275                     ((x-display-grayscale-p) 'grayscale)
 276                     (t 'mono)))))
 277   (if (null font-lock-background-mode)
 278       (setq font-lock-background-mode
 279             (let ((bg-resource (x-get-resource ".backgroundMode"
 280                                                "BackgroundMode"))
 281                   (params (frame-parameters)))
 282               (cond (bg-resource (intern (downcase bg-resource)))
 283                     ((< (apply '+ (x-color-values
 284                                    (cdr (assq 'background-color params))))
 285                         (/ (apply '+ (x-color-values "white")) 3))
 286                      'dark)
 287                     (t 'light)))))
 288   (if (null font-lock-face-attributes)
 289       (setq font-lock-face-attributes
 290             (let ((light-bg (eq font-lock-background-mode 'light)))
 291               (cond ((memq font-lock-display-type '(mono monochrome))
 292                      ;; Emacs 19.25's font-lock defaults:
 293                      ;;'((font-lock-comment-face nil nil nil t nil)
 294                      ;;  (font-lock-string-face nil nil nil nil t)
 295                      ;;  (font-lock-keyword-face nil nil t nil nil)
 296                      ;;  (font-lock-function-name-face nil nil t t nil)
 297                      ;;  (font-lock-type-face nil nil nil t nil))
 298                      (list '(font-lock-comment-face nil nil t t nil)
 299                            '(font-lock-string-face nil nil nil t nil)
 300                            '(font-lock-keyword-face nil nil t nil nil)
 301                            (list
 302                             'font-lock-function-name-face
 303                             (cdr (assq 'background-color (frame-parameters)))
 304                             (cdr (assq 'foreground-color (frame-parameters)))
 305                             t nil nil)
 306                            '(font-lock-variable-name-face nil nil t t nil)
 307                            '(font-lock-type-face nil nil t nil t)
 308                            '(font-lock-reference-face nil nil t nil t)))
 309                     ((memq font-lock-display-type '(grayscale greyscale
 310                                                     grayshade greyshade))
 311                      (list
 312                       (list 'font-lock-comment-face
 313                             nil (if light-bg "Gray80" "DimGray") t t nil)
 314                       (list 'font-lock-string-face
 315                             nil (if light-bg "Gray50" "LightGray") nil t nil)
 316                       (list 'font-lock-keyword-face
 317                             nil (if light-bg "Gray90" "DimGray") t nil nil)
 318                       (list 'font-lock-function-name-face
 319                             (cdr (assq 'background-color (frame-parameters)))
 320                             (cdr (assq 'foreground-color (frame-parameters)))
 321                             t nil nil)
 322                       (list 'font-lock-variable-name-face
 323                             nil (if light-bg "Gray90" "DimGray") t t nil)
 324                       (list 'font-lock-type-face
 325                             nil (if light-bg "Gray80" "DimGray") t nil t)
 326                       (list 'font-lock-reference-face
 327                             nil (if light-bg "LightGray" "Gray50") t nil t)))
 328                     (light-bg           ; light colour background
 329                      '((font-lock-comment-face "Firebrick")
 330                        (font-lock-string-face "RosyBrown")
 331                        (font-lock-keyword-face "Purple")
 332                        (font-lock-function-name-face "Blue")
 333                        (font-lock-variable-name-face "DarkGoldenrod")
 334                        (font-lock-type-face "DarkOliveGreen")
 335                        (font-lock-reference-face "CadetBlue")))
 336                     (t                  ; dark colour background
 337                      '((font-lock-comment-face "OrangeRed")
 338                        (font-lock-string-face "LightSalmon")
 339                        (font-lock-keyword-face "LightSteelBlue")
 340                        (font-lock-function-name-face "LightSkyBlue")
 341                        (font-lock-variable-name-face "LightGoldenrod")
 342                        (font-lock-type-face "PaleGreen")
 343                        (font-lock-reference-face "Aquamarine")))))))
 344   ;; Now make the faces if we have to.
 345   (mapcar (function
 346            (lambda (face-attributes)
 347              (let ((face (nth 0 face-attributes)))
 348                (cond (override
 349                       ;; We can stomp all over it anyway.  Get outta my face!
 350                       (font-lock-make-face face-attributes))
 351                      ((and (boundp face) (facep (symbol-value face)))
 352                       ;; The variable exists and is already bound to a face.
 353                       nil)
 354                      ((facep face)
 355                       ;; We already have a face so we bind the variable to it.
 356                       (set face face))
 357                      (t
 358                       ;; No variable or no face.
 359                       (font-lock-make-face face-attributes))))))
 360           font-lock-face-attributes))
 361
 362 (defun font-lock-make-face (face-attributes)
 363   "Make a face from FACE-ATTRIBUTES.
 364 FACE-ATTRIBUTES should be like an element `font-lock-face-attributes', so that
 365 the face name is the first item in the list.  A variable with the same name as
 366 the face is also set; its value is the face name."
 367   (let* ((face (nth 0 face-attributes))
 368          (face-name (symbol-name face))
 369          (set-p (function (lambda (face-name resource)
 370                  (x-get-resource (concat face-name ".attribute" resource)
 371                                  (concat "Face.Attribute" resource)))))
 372          (on-p (function (lambda (face-name resource)
 373                 (let ((set (funcall set-p face-name resource)))
 374                   (and set (member (downcase set) '("on" "true"))))))))
 375     (make-face face)
 376     ;; Set attributes not set from X resources (and therefore `make-face').
 377     (or (funcall set-p face-name "Foreground")
 378         (condition-case nil
 379             (set-face-foreground face (nth 1 face-attributes))
 380           (error nil)))
 381     (or (funcall set-p face-name "Background")
 382         (condition-case nil
 383             (set-face-background face (nth 2 face-attributes))
 384           (error nil)))
 385     (if (funcall set-p face-name "Bold")
 386         (and (funcall on-p face-name "Bold") (make-face-bold face nil t))
 387       (and (nth 3 face-attributes) (make-face-bold face nil t)))
 388     (if (funcall set-p face-name "Italic")
 389         (and (funcall on-p face-name "Italic") (make-face-italic face nil t))
 390       (and (nth 4 face-attributes) (make-face-italic face nil t)))
 391     (or (funcall set-p face-name "Underline")
 392         (set-face-underline-p face (nth 5 face-attributes)))
 393     (set face face)))
 394 \f
 395 ;; Fontification.
 396
 397 ;; These variables record, for each buffer, the parse state at a particular
 398 ;; position, always the start of a line.  Used to make font-lock-fontify-region
 399 ;; faster.
 400 (defvar font-lock-cache-position nil)
 401 (defvar font-lock-cache-state nil)
 402 (make-variable-buffer-local 'font-lock-cache-position)
 403 (make-variable-buffer-local 'font-lock-cache-state)
 404
 405 (defun font-lock-fontify-region (start end &optional loudly)
 406   "Put proper face on each string and comment between START and END."
 407   (save-excursion
 408     (save-restriction
 409       (widen)
 410       (goto-char start)
 411       (beginning-of-line)
 412       (if loudly (message "Fontifying %s... (syntactically...)" (buffer-name)))
 413       (let ((inhibit-read-only t) (buffer-undo-list t)
 414             buffer-file-name buffer-file-truename
 415             (modified (buffer-modified-p))
 416             (old-syntax (syntax-table))
 417             (synstart (if comment-start-skip
 418                           (concat "\\s\"\\|" comment-start-skip)
 419                         "\\s\""))
 420             (comstart (if comment-start-skip
 421                           (concat "\\s<\\|" comment-start-skip)
 422                         "\\s<"))
 423             (startline (point))
 424             state prev prevstate)
 425         (unwind-protect
 426             (progn
 427               ;;
 428               ;; Use the fontification syntax table, if any.
 429               (if font-lock-syntax-table
 430                   (set-syntax-table font-lock-syntax-table))
 431               ;;
 432               ;; Find the state at the `beginning-of-line' before `start'.
 433               (if (eq startline font-lock-cache-position)
 434                   ;; Use the cache for the state of `startline'.
 435                   (setq state font-lock-cache-state)
 436                 ;; Find the state of `startline'.
 437                 (if (null font-lock-beginning-of-syntax-function)
 438                     ;; Use the state at the previous cache position, if any, or
 439                     ;; otherwise calculate from `point-min'.
 440                     (if (or (null font-lock-cache-position)
 441                             (< startline font-lock-cache-position))
 442                         (setq state (parse-partial-sexp
 443                                      (point-min) startline))
 444                       (setq state (parse-partial-sexp
 445                                    font-lock-cache-position startline
 446                                    nil nil font-lock-cache-state)))
 447                   ;; Call the function to move outside any syntactic block.
 448                   (funcall font-lock-beginning-of-syntax-function)
 449                   (setq state (parse-partial-sexp (point) startline)))
 450                 ;; Cache the state and position of `startline'.
 451                 (setq font-lock-cache-state state
 452                       font-lock-cache-position startline))
 453               ;;
 454               ;; Now find the state at `start' based on that of `startline'.
 455               (setq state (parse-partial-sexp startline start nil nil state))
 456               ;;
 457               ;; If the region starts inside a string, show the extent of it.
 458               (if (nth 3 state)
 459                   (let ((beg (point)))
 460                     (while (and (re-search-forward "\\s\"" end 'move)
 461                                 (nth 3 (parse-partial-sexp beg (point) nil nil
 462                                                            state))))
 463                     (put-text-property beg (point) 'face font-lock-string-face)
 464                     (setq state (parse-partial-sexp beg (point)
 465                                                     nil nil state))))
 466               ;;
 467               ;; Likewise for a comment.
 468               (if (or (nth 4 state) (nth 7 state))
 469                   (let ((beg (point)))
 470                     (save-restriction
 471                       (narrow-to-region (point-min) end)
 472                       (condition-case nil
 473                           (progn
 474                             (re-search-backward comstart (point-min) 'move)
 475                             (forward-comment 1)
 476                             ;; forward-comment skips all whitespace,
 477                             ;; so go back to the real end of the comment.
 478                             (skip-chars-backward " \t"))
 479                         (error (goto-char end))))
 480                     (put-text-property beg (point) 'face
 481                                        font-lock-comment-face)
 482                     (setq state (parse-partial-sexp beg (point)
 483                                                     nil nil state))))
 484               ;;
 485               ;; Find each interesting place between here and `end'.
 486               (while (and (< (point) end)
 487                           (setq prev (point) prevstate state)
 488                           (re-search-forward synstart end t)
 489                           (progn
 490                             ;; Clear out the fonts of what we skip over.
 491                             (remove-text-properties prev (point) '(face nil))
 492                             ;; Verify the state at that place
 493                             ;; so we don't get fooled by \" or \;.
 494                             (setq state (parse-partial-sexp prev (point)
 495                                                             nil nil state))))
 496                 (let ((here (point)))
 497                   (if (or (nth 4 state) (nth 7 state))
 498                       ;;
 499                       ;; We found a real comment start.
 500                       (let ((beg (match-beginning 0)))
 501                         (goto-char beg)
 502                         (save-restriction
 503                           (narrow-to-region (point-min) end)
 504                           (condition-case nil
 505                               (progn
 506                                 (forward-comment 1)
 507                                 ;; forward-comment skips all whitespace,
 508                                 ;; so go back to the real end of the comment.
 509                                 (skip-chars-backward " \t"))
 510                             (error (goto-char end))))
 511                         (put-text-property beg (point) 'face
 512                                            font-lock-comment-face)
 513                         (setq state (parse-partial-sexp here (point)
 514                                                         nil nil state)))
 515                     (if (nth 3 state)
 516                         ;;
 517                         ;; We found a real string start.
 518                         (let ((beg (match-beginning 0)))
 519                           (while (and (re-search-forward "\\s\"" end 'move)
 520                                       (nth 3 (parse-partial-sexp
 521                                               here (point) nil nil state))))
 522                           (put-text-property beg (point) 'face
 523                                              font-lock-string-face)
 524                           (setq state (parse-partial-sexp here (point)
 525                                                           nil nil state))))))
 526                 ;;
 527                 ;; Make sure `prev' is non-nil after the loop
 528                 ;; only if it was set on the very last iteration.
 529                 (setq prev nil)))
 530           ;;
 531           ;; Clean up.
 532           (set-syntax-table old-syntax)
 533           (and prev
 534                (remove-text-properties prev end '(face nil)))
 535           (and (buffer-modified-p)
 536                (not modified)
 537                (set-buffer-modified-p nil)))))))
 538
 539 (defun font-lock-unfontify-region (beg end)
 540   (let ((modified (buffer-modified-p))
 541         (buffer-undo-list t) (inhibit-read-only t)
 542         buffer-file-name buffer-file-truename)
 543     (remove-text-properties beg end '(face nil))
 544     (and (buffer-modified-p)
 545          (not modified)
 546          (set-buffer-modified-p nil))))
 547
 548 ;; Called when any modification is made to buffer text.
 549 (defun font-lock-after-change-function (beg end old-len)
 550   (save-excursion
 551     (save-match-data
 552       ;; Discard the cache info if text before it has changed.
 553       (and font-lock-cache-position
 554            (> font-lock-cache-position beg)
 555            (setq font-lock-cache-position nil))
 556       ;; Rescan between start of line from `beg' and start of line after `end'.
 557       (goto-char beg)
 558       (beginning-of-line)
 559       (setq beg (point))
 560       (goto-char end)
 561       (forward-line 1)
 562       (setq end (point))
 563       ;; First scan for strings and comments.
 564       ;; Must scan from line start in case of
 565       ;; inserting space into `intfoo () {}', and after widened.
 566       (if font-lock-no-comments
 567           (font-lock-unfontify-region beg end)
 568         (font-lock-fontify-region beg end))
 569       ;; Now scan for keywords.
 570       (font-lock-hack-keywords beg end))))
 571
 572 ;; The following must be rethought, since keywords can override fontification.
 573 ;      ;; Now scan for keywords, but not if we are inside a comment now.
 574 ;      (or (and (not font-lock-no-comments)
 575 ;              (let ((state (parse-partial-sexp beg end nil nil
 576 ;                                               font-lock-cache-state)))
 577 ;                (or (nth 4 state) (nth 7 state))))
 578 ;         (font-lock-hack-keywords beg end))
 579 \f
 580 ;;; Fontifying arbitrary patterns
 581
 582 (defun font-lock-compile-keywords (&optional keywords)
 583   ;; Compile `font-lock-keywords' into the form (t KEYWORD ...) where KEYWORD
 584   ;; is the (MATCHER HIGHLIGHT ...) shown in the variable's doc string.
 585   (let ((keywords (or keywords font-lock-keywords)))
 586     (setq font-lock-keywords
 587      (if (eq (car-safe keywords) t)
 588          keywords
 589        (cons t
 590         (mapcar
 591          (function (lambda (item)
 592             (cond ((nlistp item)
 593                    (list item '(0 font-lock-keyword-face)))
 594                   ((numberp (cdr item))
 595                    (list (car item) (list (cdr item) 'font-lock-keyword-face)))
 596                   ((symbolp (cdr item))
 597                    (list (car item) (list 0 (cdr item))))
 598                   ((nlistp (nth 1 item))
 599                    (list (car item) (cdr item)))
 600                   (t
 601                    item))))
 602          keywords))))))
 603
 604 (defsubst font-lock-apply-highlight (highlight)
 605   "Apply HIGHLIGHT following a match.  See `font-lock-keywords'."
 606   (let* ((match (nth 0 highlight))
 607          (beg (match-beginning match)) (end (match-end match))
 608          (override (nth 2 highlight)))
 609     (cond ((not beg)
 610            ;; No match but we might not signal an error
 611            (or (nth 3 highlight) (error "Highlight %S failed" highlight)))
 612           ((and (not override) (text-property-not-all beg end 'face nil))
 613            ;; Can't override and already fontified
 614            nil)
 615           ((not (eq override 'keep))
 616            ;; Can override but need not keep existing fontification
 617            (put-text-property beg end 'face (eval (nth 1 highlight))))
 618           (t
 619            ;; Can override but must keep existing fontification
 620            (let ((pos (text-property-any beg end 'face nil)) next
 621                  (face (eval (nth 1 highlight))))
 622              (while pos
 623                (setq next (next-single-property-change pos 'face nil end))
 624                (put-text-property pos next 'face face)
 625                (setq pos (text-property-any next end 'face nil))))))))
 626
 627 (defun font-lock-hack-keywords (start end &optional loudly)
 628   "Fontify according to `font-lock-keywords' between START and END."
 629   (let ((case-fold-search font-lock-keywords-case-fold-search)
 630         (keywords (cdr (if (eq (car-safe font-lock-keywords) t)
 631                            font-lock-keywords
 632                          (font-lock-compile-keywords))))
 633         (count 0)
 634         (inhibit-read-only t) (buffer-undo-list t)
 635         buffer-file-name buffer-file-truename
 636         (modified (buffer-modified-p))
 637         (old-syntax (syntax-table))
 638         (bufname (buffer-name)))
 639     (unwind-protect
 640         (let (keyword matcher highlights lowdarks)
 641           (if loudly (message "Fontifying %s... (regexps...)" bufname))
 642           (if font-lock-syntax-table (set-syntax-table font-lock-syntax-table))
 643           (while keywords
 644             (setq keyword (car keywords) keywords (cdr keywords)
 645                   matcher (car keyword) highlights (cdr keyword))
 646             (goto-char start)
 647             (while (if (stringp matcher)
 648                        (re-search-forward matcher end t)
 649                      (funcall matcher end))
 650               ;; An explicit `while' loop is slightly faster than a `mapcar'.
 651               ;(mapcar 'font-lock-apply-highlight highlights)
 652               (setq lowdarks highlights)
 653               (while lowdarks
 654                 (font-lock-apply-highlight (car lowdarks))
 655                 (setq lowdarks (cdr lowdarks))))
 656             (if loudly (message "Fontifying %s... (regexps...%s)" bufname
 657                                 (make-string (setq count (1+ count)) ?.)))))
 658       (set-syntax-table old-syntax)
 659       (and (buffer-modified-p)
 660            (not modified)
 661            (set-buffer-modified-p nil)))))
 662 \f
 663 ;; The user level functions
 664
 665 (defvar font-lock-mode nil) ; for modeline
 666
 667 (defvar font-lock-fontified nil) ; whether we have hacked this buffer
 668 (put 'font-lock-fontified 'permanent-local t)
 669
 670 ;;;###autoload
 671 (defun font-lock-mode (&optional arg)
 672   "Toggle Font Lock mode.
 673 With arg, turn Font Lock mode on if and only if arg is positive.
 674
 675 When Font Lock mode is enabled, text is fontified as you type it:
 676
 677  - Comments are displayed in `font-lock-comment-face';
 678  - Strings are displayed in `font-lock-string-face';
 679  - Certain other expressions are displayed in other faces according to the
 680    value of the variable `font-lock-keywords'.
 681
 682 You can enable Font Lock mode in any major mode automatically by turning on in
 683 the major mode's hook.  For example, put in your ~/.emacs:
 684
 685  (add-hook 'c-mode-hook 'turn-on-font-lock)
 686
 687 Or for any visited file with the following in your ~/.emacs:
 688
 689  (add-hook 'find-file-hooks 'turn-on-font-lock)
 690
 691 The default Font Lock mode faces and their attributes are defined in the
 692 variable `font-lock-face-attributes', and Font Lock mode default settings in
 693 the variable `font-lock-defaults-alist'.
 694
 695 Where modes support different levels of fontification, you can use the variable
 696 `font-lock-maximum-decoration' to specify which level you generally prefer.
 697 When you turn Font Lock mode on/off the buffer is fontified/defontified, though
 698 fontification occurs only if the buffer is less than `font-lock-maximum-size'.
 699 To fontify a buffer without turning on Font Lock mode, and regardless of buffer
 700 size, you can use \\[font-lock-fontify-buffer]."
 701   (interactive "P")
 702   (let ((on-p (if arg (> (prefix-numeric-value arg) 0) (not font-lock-mode))))
 703     (if (equal (buffer-name) " *Compiler Input*") ; hack for bytecomp...
 704         (setq on-p nil))
 705     (if (not on-p)
 706         (remove-hook 'after-change-functions 'font-lock-after-change-function)
 707       (make-local-variable 'after-change-functions)
 708       (add-hook 'after-change-functions 'font-lock-after-change-function))
 709     (set (make-local-variable 'font-lock-mode) on-p)
 710     (cond (on-p
 711            (font-lock-set-defaults)
 712            (make-local-variable 'before-revert-hook)
 713            (make-local-variable 'after-revert-hook)
 714            ;; If buffer is reverted, must clean up the state.
 715            (add-hook 'before-revert-hook 'font-lock-revert-setup)
 716            (add-hook 'after-revert-hook 'font-lock-revert-cleanup)
 717            (run-hooks 'font-lock-mode-hook)
 718            (cond (font-lock-fontified
 719                   nil)
 720                  ((or (null font-lock-maximum-size)
 721                       (> font-lock-maximum-size (buffer-size)))
 722                   (font-lock-fontify-buffer))
 723                  (font-lock-verbose
 724                   (message "Fontifying %s... buffer too big." (buffer-name)))))
 725           (font-lock-fontified
 726            (setq font-lock-fontified nil)
 727            (remove-hook 'before-revert-hook 'font-lock-revert-setup)
 728            (remove-hook 'after-revert-hook 'font-lock-revert-cleanup)
 729            (font-lock-unfontify-region (point-min) (point-max))
 730            (font-lock-thing-lock-cleanup))
 731           (t
 732            (remove-hook 'before-revert-hook 'font-lock-revert-setup)
 733            (remove-hook 'after-revert-hook 'font-lock-revert-cleanup)
 734            (font-lock-thing-lock-cleanup)))
 735     (force-mode-line-update)))
 736
 737 ;;;###autoload
 738 (defun turn-on-font-lock ()
 739   "Unconditionally turn on Font Lock mode."
 740   (font-lock-mode 1))
 741
 742 ;; Turn off other related packages if they're on.  I prefer a hook. --sm.
 743 ;; These explicit calls are easier to understand
 744 ;; because people know what they will do.
 745 ;; A hook is a mystery because it might do anything whatever. --rms.
 746 (defun font-lock-thing-lock-cleanup ()
 747   (cond ((and (boundp 'fast-lock-mode) fast-lock-mode)
 748          (fast-lock-mode -1))
 749         ((and (boundp 'lazy-lock-mode) lazy-lock-mode)
 750          (lazy-lock-mode -1))))
 751
 752 ;; Do something special for these packages after fontifying.  I prefer a hook.
 753 (defun font-lock-after-fontify-buffer ()
 754   (cond ((and (boundp 'fast-lock-mode) fast-lock-mode)
 755          (fast-lock-after-fontify-buffer))
 756         ((and (boundp 'lazy-lock-mode) lazy-lock-mode)
 757          (lazy-lock-after-fontify-buffer))))
 758
 759 ;; If the buffer is about to be reverted, it won't be fontified afterward.
 760 (defun font-lock-revert-setup ()
 761   (setq font-lock-fontified nil))
 762
 763 ;; If the buffer has just been reverted, normally that turns off
 764 ;; Font Lock mode.  So turn the mode back on if necessary.
 765 (defun font-lock-revert-cleanup ()
 766   (font-lock-mode 1))
 767
 768 ;;;###autoload
 769 (defun font-lock-fontify-buffer ()
 770   "Fontify the current buffer the way `font-lock-mode' would."
 771   (interactive)
 772   (let ((was-on font-lock-mode)
 773         (verbose (and (or font-lock-verbose (interactive-p))
 774                       (not (zerop (buffer-size)))))
 775         (modified (buffer-modified-p)))
 776     (set (make-local-variable 'font-lock-fontified) nil)
 777     (if verbose (message "Fontifying %s..." (buffer-name)))
 778     ;; Turn it on to run hooks and get the right `font-lock-keywords' etc.
 779     (or was-on (font-lock-set-defaults))
 780     (condition-case nil
 781         (save-excursion
 782           (if font-lock-no-comments
 783               (font-lock-unfontify-region (point-min) (point-max))
 784             (font-lock-fontify-region (point-min) (point-max) verbose))
 785           (font-lock-hack-keywords (point-min) (point-max) verbose)
 786           (setq font-lock-fontified t))
 787       ;; We don't restore the old fontification, so it's best to unfontify.
 788       (quit (font-lock-unfontify-region (point-min) (point-max))))
 789     (if verbose (message "Fontifying %s... %s." (buffer-name)
 790                          (if font-lock-fontified "done" "aborted")))
 791     (and (buffer-modified-p)
 792          (not modified)
 793          (set-buffer-modified-p nil))
 794     (font-lock-after-fontify-buffer)))
 795
 796 (defun font-lock-choose-keywords (keywords level)
 797   ;; Return LEVELth element of KEYWORDS.  A LEVEL of nil is equal to a
 798   ;; LEVEL of 0, a LEVEL of t is equal to (1- (length KEYWORDS)).
 799   (cond ((symbolp keywords)
 800          keywords)
 801         ((numberp level)
 802          (or (nth level keywords) (car (reverse keywords))))
 803         ((eq level t)
 804          (car (reverse keywords)))
 805         (t
 806          (car keywords))))
 807
 808 (defun font-lock-set-defaults ()
 809   "Set fontification defaults appropriately for this mode.
 810 Sets `font-lock-keywords', `font-lock-no-comments', `font-lock-syntax-table'
 811 and `font-lock-keywords-case-fold-search' using `font-lock-defaults' (or, if
 812 nil, using `font-lock-defaults-alist') and `font-lock-maximum-decoration'."
 813   ;; Set face defaults.
 814   (font-lock-make-faces)
 815   ;; Set fontification defaults.
 816   (or font-lock-keywords
 817       (let ((defaults (or font-lock-defaults
 818                           (cdr (assq major-mode font-lock-defaults-alist)))))
 819         ;; Keywords?
 820         (setq font-lock-keywords
 821               (font-lock-compile-keywords
 822                (eval (font-lock-choose-keywords (nth 0 defaults)
 823                       font-lock-maximum-decoration))))
 824         ;; Syntactic?
 825         (if (nth 1 defaults)
 826             (set (make-local-variable 'font-lock-no-comments) t))
 827         ;; Case fold?
 828         (if (nth 2 defaults)
 829             (set (make-local-variable 'font-lock-keywords-case-fold-search) t))
 830         ;; Syntax table?
 831         (if (nth 3 defaults)
 832             (let ((slist (nth 3 defaults)))
 833               (set (make-local-variable 'font-lock-syntax-table)
 834                    (copy-syntax-table (syntax-table)))
 835               (while slist
 836                 (modify-syntax-entry (car (car slist)) (cdr (car slist))
 837                                      font-lock-syntax-table)
 838                 (setq slist (cdr slist)))))
 839         ;; Syntactic cache function?
 840         (if (nth 4 defaults)
 841             (set (make-local-variable 'font-lock-beginning-of-syntax-function)
 842                  (nth 4 defaults))))))
 843 \f
 844 ;;; Various information shared by several modes.
 845 ;;; Information specific to a single mode should go in its load library.
 846
 847 (defconst lisp-font-lock-keywords-1
 848   (list
 849    ;; Everything not a variable or type declaration is fontified as a function.
 850    ;; It would be cleaner to allow preceding whitespace, but it would also be
 851    ;; about five times slower.
 852    (list (concat "^(\\(def\\("
 853                  ;; Variable declarations.
 854                  "\\(const\\(\\|ant\\)\\|ine-key\\(\\|-after\\)\\|var\\)\\|"
 855                  ;; Structure declarations.
 856                  "\\(class\\|struct\\|type\\)\\|"
 857                  ;; Everything else is a function declaration.
 858                  "\\([^ \t\n\(\)]+\\)"
 859                  "\\)\\)\\>"
 860                  ;; Any whitespace and declared object.
 861                  "[ \t'\(]*"
 862                  "\\([^ \t\n\)]+\\)?")
 863          '(1 font-lock-keyword-face)
 864          '(8 (cond ((match-beginning 3) font-lock-variable-name-face)
 865                    ((match-beginning 6) font-lock-type-face)
 866                    (t font-lock-function-name-face))
 867              nil t)))
 868  "Subdued level highlighting Lisp modes.")
 869
 870 (defconst lisp-font-lock-keywords-2
 871   (append lisp-font-lock-keywords-1
 872    (let ((word-char "[-+a-zA-Z0-9_:*]"))
 873      (list
 874       ;;
 875       ;; Control structures.  ELisp and CLisp combined.
 876 ;      (make-regexp
 877 ;       '("cond" "if" "while" "let\\*?" "prog[nv12*]?" "catch" "throw"
 878 ;        "save-restriction" "save-excursion" "save-window-excursion"
 879 ;        "save-selected-window" "save-match-data" "unwind-protect"
 880 ;        "condition-case" "track-mouse"
 881 ;        "eval-after-load" "eval-and-compile" "eval-when-compile"
 882 ;        "when" "unless" "do" "flet" "labels" "return" "return-from"))
 883       (cons
 884        (concat
 885         "(\\("
 886         "\\(c\\(atch\\|ond\\(\\|ition-case\\)\\)\\|do\\|"
 887         "eval-\\(a\\(fter-load\\|nd-compile\\)\\|when-compile\\)\\|flet\\|"
 888         "if\\|l\\(abels\\|et\\*?\\)\\|prog[nv12*]?\\|return\\(\\|-from\\)\\|"
 889         "save-\\(excursion\\|match-data\\|restriction\\|selected-window\\|"
 890         "window-excursion\\)\\|t\\(hrow\\|rack-mouse\\)\\|"
 891         "un\\(less\\|wind-protect\\)\\|wh\\(en\\|ile\\)\\)"
 892         "\\)\\>") 1)
 893       ;;
 894       ;; Function names in emacs-lisp docstrings (in the syntax that
 895       ;; `substitute-command-keys' understands).
 896       (list (concat "\\\\\\\\\\[\\(" word-char "+\\)]")
 897             1 font-lock-reference-face t)
 898       ;;
 899       ;; Words inside `' which tend to be symbol names.
 900       (list (concat "`\\(" word-char word-char "+\\)'")
 901             1 'font-lock-reference-face t)
 902       ;;
 903       ;; CLisp `:' keywords as references.
 904       (list (concat "\\<:" word-char "+\\>") 0 font-lock-reference-face t)
 905       ;;
 906       ;; ELisp and CLisp `&' keywords as types.
 907       '("\\&\\(optional\\|rest\\|whole\\)\\>" . font-lock-type-face)
 908       )))
 909   "Gaudy level highlighting for Lisp modes.")
 910
 911 (defvar lisp-font-lock-keywords lisp-font-lock-keywords-1
 912   "Default expressions to highlight in Lisp modes.")
 913
 914
 915 (defvar scheme-font-lock-keywords
 916   (list
 917    ;;
 918    ;; Declarations.
 919    '("^[ \t]*(\\(define\\)\\>[ \t]*(?\\([^ \t\n\)]+\\)?"
 920      (1 font-lock-keyword-face) (2 font-lock-function-name-face nil t))
 921    ;;
 922    ;; Control structures.
 923 ;(make-regexp '("begin" "call-with-current-continuation" "call/cc"
 924 ;              "call-with-input-file" "call-with-output-file" "case" "cond"
 925 ;              "define-syntax" "do" "else" "for-each" "if" "lambda"
 926 ;              "let-syntax" "let\\*?" "letrec" "letrec-syntax"
 927 ;              ;; Stefan Monnier <stefan.monnier@epfl.ch> says don't bother.
 928 ;              ;;"quasiquote" "quote" "unquote" "unquote-splicing"
 929 ;              "map" "syntax" "syntax-rules"))
 930    (cons
 931     (concat "(\\("
 932             "begin\\|c\\(a\\(ll\\(-with-\\(current-continuation\\|"
 933             "input-file\\|output-file\\)\\|/cc\\)\\|se\\)\\|ond\\)\\|"
 934             "d\\(efine-syntax\\|o\\)\\|else\\|for-each\\|if\\|"
 935             "l\\(ambda\\|et\\(-syntax\\|\\*?\\|rec\\(\\|-syntax\\)\\)\\)\\|"
 936             "map\\|syntax\\(\\|-rules\\)"
 937             "\\)\\>") 1))
 938   "Default expressions to highlight in Scheme modes.")
 939
 940
 941 (defconst c-font-lock-keywords-1 nil
 942   "Subdued level highlighting for C modes.")
 943
 944 (defconst c-font-lock-keywords-2 nil
 945   "Gaudy level highlighting for C modes.")
 946
 947 (defconst c++-font-lock-keywords-1 nil
 948   "Subdued level highlighting for C++ modes.")
 949
 950 (defconst c++-font-lock-keywords-2 nil
 951   "Gaudy level highlighting for C++ modes.")
 952
 953 (let ((c-keywords
 954 ;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while")
 955        "break\\|continue\\|do\\|else\\|for\\|if\\|return\\|switch\\|while")
 956       (c-type-types
 957 ;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
 958 ;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
 959 ;       "void" "volatile" "const")
 960        (concat "auto\\|c\\(har\\|onst\\)\\|double\\|e\\(num\\|xtern\\)\\|"
 961                "float\\|int\\|long\\|register\\|"
 962                "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|typedef\\|"
 963                "un\\(ion\\|signed\\)\\|vo\\(id\\|latile\\)"))   ; 6 ()s deep.
 964       (c++-keywords
 965 ;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while"
 966 ;       "asm" "catch" "delete" "new" "operator" "sizeof" "this" "throw" "try"
 967 ;       "protected" "private" "public")
 968        (concat "asm\\|break\\|c\\(atch\\|ontinue\\)\\|d\\(elete\\|o\\)\\|"
 969                "else\\|for\\|if\\|new\\|operator\\|"
 970                "p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\|return\\|"
 971                "s\\(izeof\\|witch\\)\\|t\\(h\\(is\\|row\\)\\|ry\\)\\|while"))
 972       (c++-type-types
 973 ;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
 974 ;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
 975 ;       "void" "volatile" "const" "class" "inline" "friend" "bool"
 976 ;       "virtual" "complex" "template")
 977        (concat "auto\\|bool\\|c\\(har\\|lass\\|o\\(mplex\\|nst\\)\\)\\|"
 978                "double\\|e\\(num\\|xtern\\)\\|f\\(loat\\|riend\\)\\|"
 979                "in\\(line\\|t\\)\\|long\\|register\\|"
 980                "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|"
 981                "t\\(emplate\\|ypedef\\)\\|un\\(ion\\|signed\\)\\|"
 982                "v\\(irtual\\|o\\(id\\|latile\\)\\)"))           ; 11 ()s deep.
 983       (ctoken "[a-zA-Z0-9_:~]+"))
 984  (setq c-font-lock-keywords-1
 985   (list
 986    ;;
 987    ;; Fontify filenames in #include <...> preprocessor directives.
 988    '("^#[ \t]*include[ \t]+\\(<[^>\"\n]+>\\)" 1 font-lock-string-face)
 989    ;;
 990    ;; Fontify function macro names.
 991    '("^#[ \t]*define[ \t]+\\(\\(\\sw+\\)(\\)" 2 font-lock-function-name-face)
 992    ;;
 993    ;; Fontify otherwise as symbol names, and the preprocessor directive names.
 994    '("^\\(#[ \t]*[a-z]+\\)\\>[ \t]*\\(\\sw+\\)?"
 995      (1 font-lock-reference-face) (2 font-lock-variable-name-face nil t))
 996    ;;
 997    ;; Fontify function name definitions (without type on line).
 998    (list (concat "^\\(" ctoken "\\)[ \t]*(") 1 'font-lock-function-name-face)
 999    ))
1000
1001  (setq c-font-lock-keywords-2
1002   (append c-font-lock-keywords-1
1003    (list
1004     ;;
1005     ;; Fontify all storage classes and type specifiers (before declarations).
1006     (cons (concat "\\<\\(" c-type-types "\\)\\>") 'font-lock-type-face)
1007     ;;
1008     ;; Fontify variable/structure name declarations and definitions, or
1009     ;; function name declarations (plus definitions with type on same line).
1010     (list (concat "\\<\\(" c-type-types "\\)[ \t*]+"
1011                   "\\(" ctoken "[ \t*]+\\)*"
1012                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
1013           9
1014           '(if (match-beginning 10)
1015                font-lock-function-name-face
1016              font-lock-variable-name-face))
1017     ;;
1018     ;; Fontify function/variable name declarations at the start of the line.
1019     ;; (Not everyone follows the GNU convention of function name at the start.)
1020     (list (concat "^" ctoken "[ \t*]+"
1021                   "\\(" ctoken "[ \t*]+\\)*"
1022                   "\\(" ctoken "\\)[ \t]*\\((\\)?")
1023           2
1024           '(if (match-beginning 3)
1025                font-lock-function-name-face
1026              font-lock-variable-name-face))
1027     ;;
1028     ;; Fontify variable names declared with structures, or typedef names.
1029     '("}[ \t*]*\\(\\sw+\\)[ \t]*[;,[]" 1 font-lock-variable-name-face)
1030     ;;
1031     ;; Fontify all builtin keywords (except case, default and goto; see below).
1032     (concat "\\<\\(" c-keywords "\\)\\>")
1033     ;;
1034     ;; Fontify case/goto keywords and targets, and goto tags (incl "default:").
1035     '("\\<\\(case\\|goto\\)\\>[ \t]*\\([^ \t\n:;]+\\)?"
1036       (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
1037     '("^[ \t]*\\(\\sw+\\)[ \t]*:" 1 font-lock-reference-face)
1038     )))
1039
1040  (setq c++-font-lock-keywords-1 c-font-lock-keywords-1)
1041  (setq c++-font-lock-keywords-2
1042   (append c++-font-lock-keywords-1
1043    (list
1044     ;; We don't just add to the C keywords for subtle differences and speed.
1045     ;; See the above comments for `c-font-lock-keywords-2'.
1046     (cons (concat "\\<\\(" c++-type-types "\\)\\>") 'font-lock-type-face)
1047     (list (concat "\\<\\(" c++-type-types "\\)[ \t*&]+"
1048                   "\\(" ctoken "[ \t*&]+\\)*"
1049                   "\\(" ctoken "\\)[ \t<>=!+-]*\\((\\)?")
1050           14
1051           '(if (match-beginning 15)
1052                font-lock-function-name-face
1053              font-lock-variable-name-face))
1054     (list (concat "^" ctoken "[ \t*]+"
1055                   "\\(" ctoken "[ \t*]+\\)*"
1056                   "\\(" ctoken "\\)[ \t<>=!+-]*\\((\\)?")
1057           2
1058           '(if (match-beginning 3)
1059                font-lock-function-name-face
1060              font-lock-variable-name-face))
1061     '("}[ \t*]*\\(\\sw+\\)[ \t]*[;,[]" 1 font-lock-variable-name-face)
1062     (concat "\\<\\(" c++-keywords "\\)\\>")
1063     '("\\<\\(case\\|goto\\)\\>[ \t]*\\([^ \t\n:;]+\\)?"
1064       (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
1065     '("^[ \t]*\\(\\sw+\\)[ \t]*:[^:]" 1 font-lock-reference-face))))
1066  )
1067
1068 (defvar c-font-lock-keywords c-font-lock-keywords-1
1069   "Default expressions to highlight in C mode.")
1070
1071 (defvar c++-font-lock-keywords c++-font-lock-keywords-1
1072   "Default expressions to highlight in C++ mode.")
1073
1074
1075 (defvar tex-font-lock-keywords
1076 ;  ;; Regexps updated with help from Ulrik Dickow <dickow@nbi.dk>.
1077 ;  '(("\\\\\\(begin\\|end\\|newcommand\\){\\([a-zA-Z0-9\\*]+\\)}"
1078 ;     2 font-lock-function-name-face)
1079 ;    ("\\\\\\(cite\\|label\\|pageref\\|ref\\){\\([^} \t\n]+\\)}"
1080 ;     2 font-lock-reference-face)
1081 ;    ;; It seems a bit dubious to use `bold' and `italic' faces since we might
1082 ;    ;; not be able to display those fonts.
1083 ;    ("{\\\\bf\\([^}]+\\)}" 1 'bold keep)
1084 ;    ("{\\\\\\(em\\|it\\|sl\\)\\([^}]+\\)}" 2 'italic keep)
1085 ;    ("\\\\\\([a-zA-Z@]+\\|.\\)" . font-lock-keyword-face)
1086 ;    ("^[ \t\n]*\\\\def[\\\\@]\\(\\w+\\)" 1 font-lock-function-name-face keep))
1087   ;; Rewritten and extended for LaTeX2e by Ulrik Dickow <dickow@nbi.dk>.
1088   '(("\\\\\\(begin\\|end\\|newcommand\\){\\([a-zA-Z0-9\\*]+\\)}"
1089      2 font-lock-function-name-face)
1090     ("\\\\\\(cite\\|label\\|pageref\\|ref\\){\\([^} \t\n]+\\)}"
1091      2 font-lock-reference-face)
1092     ("^[ \t]*\\\\def\\\\\\(\\(\\w\\|@\\)+\\)" 1 font-lock-function-name-face)
1093     ("\\\\\\([a-zA-Z@]+\\|.\\)" . font-lock-keyword-face)
1094     ;; It seems a bit dubious to use `bold' and `italic' faces since we might
1095     ;; not be able to display those fonts.
1096     ;; LaTeX2e: \emph{This is emphasized}.
1097     ("\\\\emph{\\([^}]+\\)}" 1 'italic keep)
1098     ;; LaTeX2e: \textbf{This is bold}, \textit{...}, \textsl{...}
1099     ("\\\\text\\(\\(bf\\)\\|it\\|sl\\){\\([^}]+\\)}"
1100      3 (if (match-beginning 2) 'bold 'italic) keep)
1101     ;; Old-style bf/em/it/sl. Stop at `\\' and un-escaped `&', for good tables.
1102     ("\\\\\\(\\(bf\\)\\|em\\|it\\|sl\\)\\>\\(\\([^}&\\]\\|\\\\[^\\]\\)+\\)"
1103      3 (if (match-beginning 2) 'bold 'italic) keep))
1104   "Additional expressions to highlight in TeX modes.")
1105 \f
1106 ;; Install ourselves:
1107
1108 (or (assq 'font-lock-mode minor-mode-alist)
1109     (setq minor-mode-alist (cons '(font-lock-mode " Font") minor-mode-alist)))
1110
1111 ;; Provide ourselves:
1112
1113 (provide 'font-lock)
1114
1115 ;;; font-lock.el ends here