[bpt/emacs.git] / lisp / font-lock.el

;;; font-lock.el --- Electric font lock mode

;; Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.

;; Author: jwz, then rms, then sm <simon@gnu.ai.mit.edu>
;; Maintainer: FSF
;; Keywords: languages, faces

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Font Lock mode is a minor mode that causes your comments to be displayed in
;; one face, strings in another, reserved words in another, and so on.
;;
;; Comments will be displayed in `font-lock-comment-face'.
;; Strings will be displayed in `font-lock-string-face'.
;; Regexps are used to display selected patterns in other faces.
;;
;; To make the text you type be fontified, use M-x font-lock-mode RET.
;; When this minor mode is on, the faces of the current line are updated with
;; every insertion or deletion.
;;
;; To turn Font Lock mode on automatically, add this to your ~/.emacs file:
;;
;;  (add-hook 'emacs-lisp-mode-hook 'turn-on-font-lock)
;;
;; Or if you want to turn Font Lock mode on in many modes:
;;
;;  (global-font-lock-mode t)
;;
;; Fontification for a particular mode may be available in a number of levels
;; of decoration.  The higher the level, the more decoration, but the more time
;; it takes to fontify.  See the variable `font-lock-maximum-decoration', and
;; also the variable `font-lock-maximum-size'.  Support modes for Font Lock
;; mode can be used to speed up Font Lock mode.  See `font-lock-support-mode'.
\f
;; Constructing patterns:
;;
;; See the documentation for the variable `font-lock-keywords'.
;;
;; Nasty regexps of the form "bar\\(\\|lo\\)\\|f\\(oo\\|u\\(\\|bar\\)\\)\\|lo"
;; are made thusly: (make-regexp '("foo" "fu" "fubar" "bar" "barlo" "lo")) for
;; efficiency.  See /pub/gnu/emacs/elisp-archive/functions/make-regexp.el.Z on
;; archive.cis.ohio-state.edu for this and other functions.

;; Adding patterns for modes that already support Font Lock:
;;
;; Font Lock mode uses the buffer local variable `font-lock-keywords' for the
;; highlighting patterns.  This variable is set by Font Lock mode from (a) the
;; buffer local variable `font-lock-defaults', if non-nil, or (b) the global
;; variable `font-lock-defaults-alist', if the major mode has an entry. 
;; Font Lock mode is set up via (a) where a mode's patterns are distributed
;; with the mode's package library, (b) where a mode's patterns are distributed
;; with font-lock.el itself.  An example of (a) is Pascal mode, an example of
;; (b) is C/C++ modes.  (Normally, the mechanism is (a); (b) is used where it
;; is not clear which package library should contain the pattern definitions.)
;;
;; If, for a particular mode, mechanism (a) is used, you need to add your
;; patterns after that package library has loaded, e.g.:
;;
;;  (eval-after-load "pascal" '(add-to-list 'pascal-font-lock-keywords ...))
;;
;; (Note that only one pattern can be added with `add-to-list'.  For multiple
;; patterns, use one `eval-after-load' form with one `setq' and `append' form,
;; or multiple `eval-after-load' forms each with one `add-to-list' form.)
;; If mechanism (b) is used, you need to add your patterns after font-lock.el
;; itself has loaded, e.g.:
;;
;;  (eval-after-load "font-lock" '(add-to-list 'c-font-lock-keywords ...))
;;
;; Which variable you should add to depends on what level of fontification you
;; choose and what level is supported.  If you choose the maximum level, by
;; setting the variable `font-lock-maximum-decoration', you change a different
;; variable.  Maximum level patterns for C are `c-font-lock-keywords-3', so:
;;
;;  (setq font-lock-maximum-decoration t)
;;  (eval-after-load "font-lock"
;;   '(add-to-list 'c-font-lock-keywords-3
;;                 '("\\<FILE\\>" . font-lock-type-face)))
;;
;; To see which variable to set, see the buffer's value of `font-lock-defaults'
;; or the mode's entry in the global value of `font-lock-defaults-alist'.

;; Adding patterns for modes that do not support Font Lock:
;;
;; If you add patterns for a new mode, say foo.el's `foo-mode', say in which
;; you don't want syntactic fontification to occur, you can make Font Lock mode
;; use your regexps when turning on Font Lock by adding to `foo-mode-hook':
;;
;;  (add-hook 'foo-mode-hook
;;   '(lambda () (make-local-variable 'font-lock-defaults)
;;               (setq font-lock-defaults '(foo-font-lock-keywords t))))
\f
;; What is fontification for?  You might say, "It's to make my code look nice."
;; I think it should be for adding information in the form of cues.  These cues
;; should provide you with enough information to both (a) distinguish between
;; different items, and (b) identify the item meanings, without having to read
;; the items and think about it.  Therefore, fontification allows you to think
;; less about, say, the structure of code, and more about, say, why the code
;; doesn't work.  Or maybe it allows you to think less and drift off to sleep.
;;
;; So, here are my opinions/advice/guidelines:
;; 
;; - Highlight conceptual objects, such as function and variable names, and
;;   different objects types differently, i.e., (a) and (b) above, highlight
;;   function names differently to variable names.
;; - Keep the faces distinct from each other as far as possible.
;;   i.e., (a) above.
;; - Use the same face for the same conceptual object, across all modes.
;;   i.e., (b) above, all modes that have items that can be thought of as, say,
;;   keywords, should be highlighted with the same face, etc.
;; - Make the face attributes fit the concept as far as possible.
;;   i.e., function names might be a bold colour such as blue, comments might
;;   be a bright colour such as red, character strings might be brown, because,
;;   err, strings are brown (that was not the reason, please believe me).
;; - Don't use a non-nil OVERRIDE unless you have a good reason.
;;   Only use OVERRIDE for special things that are easy to define, such as the
;;   way `...' quotes are treated in strings and comments in Emacs Lisp mode.
;;   Don't use it to, say, highlight keywords in commented out code or strings.
;; - Err, that's it.
\f
;; User variables.

(defvar font-lock-verbose (* 0 1024)
  "*If non-nil, means show status messages for buffer fontification.
If a number, only buffers greater than this size have fontification messages.")

;;;###autoload
(defvar font-lock-maximum-decoration nil
  "*Maximum decoration level for fontification.
If nil, use the default decoration (typically the minimum available).
If t, use the maximum decoration available.
If a number, use that level of decoration (or if not available the maximum).
If a list, each element should be a cons pair of the form (MAJOR-MODE . LEVEL),
where MAJOR-MODE is a symbol or t (meaning the default).  For example:
 ((c-mode . t) (c++-mode . 2) (t . 1))
means use the maximum decoration available for buffers in C mode, level 2
decoration for buffers in C++ mode, and level 1 decoration otherwise.")

;;;###autoload
(defvar font-lock-maximum-size (* 250 1024)
  "*Maximum size of a buffer for buffer fontification.
Only buffers less than this can be fontified when Font Lock mode is turned on.
If nil, means size is irrelevant.
If a list, each element should be a cons pair of the form (MAJOR-MODE . SIZE),
where MAJOR-MODE is a symbol or t (meaning the default).  For example:
 ((c-mode . 256000) (c++-mode . 256000) (rmail-mode . 1048576))
means that the maximum size is 250K for buffers in C or C++ modes, one megabyte
for buffers in Rmail mode, and size is irrelevant otherwise.")
\f
;; Fontification variables:

(defvar font-lock-comment-face          'font-lock-comment-face
  "Face to use for comments.")

(defvar font-lock-string-face           'font-lock-string-face
  "Face to use for strings.")

(defvar font-lock-keyword-face          'font-lock-keyword-face
  "Face to use for keywords.")

(defvar font-lock-function-name-face    'font-lock-function-name-face
  "Face to use for function names.")

(defvar font-lock-variable-name-face    'font-lock-variable-name-face
  "Face to use for variable names.")

(defvar font-lock-type-face             'font-lock-type-face
  "Face to use for type names.")

(defvar font-lock-reference-face        'font-lock-reference-face
  "Face to use for reference names.")

(defvar font-lock-keywords nil
  "*A list of the keywords to highlight.
Each element should be of the form:

 MATCHER
 (MATCHER . MATCH)
 (MATCHER . FACENAME)
 (MATCHER . HIGHLIGHT)
 (MATCHER HIGHLIGHT ...)
 (eval . FORM)

where HIGHLIGHT should be either MATCH-HIGHLIGHT or MATCH-ANCHORED.

FORM is an expression, whose value should be a keyword element, evaluated when
the keyword is (first) used in a buffer.  This feature can be used to provide a
keyword that can only be generated when Font Lock mode is actually turned on.

For highlighting single items, typically only MATCH-HIGHLIGHT is required.
However, if an item or (typically) items are to be highlighted following the
instance of another item (the anchor) then MATCH-ANCHORED may be required.

MATCH-HIGHLIGHT should be of the form:

 (MATCH FACENAME OVERRIDE LAXMATCH)

Where MATCHER can be either the regexp to search for, or the function name to
call to make the search (called with one argument, the limit of the search).
MATCH is the subexpression of MATCHER to be highlighted.  FACENAME is an
expression whose value is the face name to use.  FACENAME's default attributes
may be defined in `font-lock-face-attributes'.

OVERRIDE and LAXMATCH are flags.  If OVERRIDE is t, existing fontification may
be overwritten.  If `keep', only parts not already fontified are highlighted.
If `prepend' or `append', existing fontification is merged with the new, in
which the new or existing fontification, respectively, takes precedence.
If LAXMATCH is non-nil, no error is signaled if there is no MATCH in MATCHER.

For example, an element of the form highlights (if not already highlighted):

 \"\\\\\\=<foo\\\\\\=>\"                Discrete occurrences of \"foo\" in the value of the
                        variable `font-lock-keyword-face'.
 (\"fu\\\\(bar\\\\)\" . 1)      Substring \"bar\" within all occurrences of \"fubar\" in
                        the value of `font-lock-keyword-face'.
 (\"fubar\" . fubar-face)       Occurrences of \"fubar\" in the value of `fubar-face'.
 (\"foo\\\\|bar\" 0 foo-bar-face t)
                        Occurrences of either \"foo\" or \"bar\" in the value
                        of `foo-bar-face', even if already highlighted.

MATCH-ANCHORED should be of the form:

 (MATCHER PRE-MATCH-FORM POST-MATCH-FORM MATCH-HIGHLIGHT ...)

Where MATCHER is as for MATCH-HIGHLIGHT with one exception.  The limit of the
search is currently guaranteed to be (no greater than) the end of the line.
PRE-MATCH-FORM and POST-MATCH-FORM are evaluated before the first, and after
the last, instance MATCH-ANCHORED's MATCHER is used.  Therefore they can be
used to initialise before, and cleanup after, MATCHER is used.  Typically,
PRE-MATCH-FORM is used to move to some position relative to the original
MATCHER, before starting with MATCH-ANCHORED's MATCHER.  POST-MATCH-FORM might
be used to move, before resuming with MATCH-ANCHORED's parent's MATCHER.

For example, an element of the form highlights (if not already highlighted):

 (\"\\\\\\=<anchor\\\\\\=>\" (0 anchor-face) (\"\\\\\\=<item\\\\\\=>\" nil nil (0 item-face)))

 Discrete occurrences of \"anchor\" in the value of `anchor-face', and subsequent
 discrete occurrences of \"item\" (on the same line) in the value of `item-face'.
 (Here PRE-MATCH-FORM and POST-MATCH-FORM are nil.  Therefore \"item\" is
 initially searched for starting from the end of the match of \"anchor\", and
 searching for subsequent instance of \"anchor\" resumes from where searching
 for \"item\" concluded.)

Note that the MATCH-ANCHORED feature is experimental; in the future, we may
replace it with other ways of providing this functionality.

These regular expressions should not match text which spans lines.  While
\\[font-lock-fontify-buffer] handles multi-line patterns correctly, updating
when you edit the buffer does not, since it considers text one line at a time.

Be very careful composing regexps for this list;
the wrong pattern can dramatically slow things down!")
(make-variable-buffer-local 'font-lock-keywords)

(defvar font-lock-defaults nil
  "If set by a major mode, should be the defaults for Font Lock mode.
The value should be like the `cdr' of an item in `font-lock-defaults-alist'.")

(defvar font-lock-defaults-alist
  (let (;; For C and Lisp modes we use `beginning-of-defun', rather than nil,
        ;; for SYNTAX-BEGIN.  Thus the calculation of the cache is usually
        ;; faster but not infallible, so we risk mis-fontification.  --sm.
        (c-mode-defaults
         '((c-font-lock-keywords c-font-lock-keywords-1
            c-font-lock-keywords-2 c-font-lock-keywords-3)
           nil nil ((?_ . "w")) beginning-of-defun
           (font-lock-comment-start-regexp . "/[*/]")
           (font-lock-mark-block-function . mark-defun)))
        (c++-mode-defaults
         '((c++-font-lock-keywords c++-font-lock-keywords-1 
            c++-font-lock-keywords-2 c++-font-lock-keywords-3)
           nil nil ((?_ . "w") (?~ . "w")) beginning-of-defun
           (font-lock-comment-start-regexp . "/[*/]")
           (font-lock-mark-block-function . mark-defun)))
        (lisp-mode-defaults
         '((lisp-font-lock-keywords
            lisp-font-lock-keywords-1 lisp-font-lock-keywords-2)
           nil nil (("+-*/.<>=!?$%_&~^:" . "w")) beginning-of-defun
           (font-lock-comment-start-regexp . ";")
           (font-lock-mark-block-function . mark-defun)))
        (scheme-mode-defaults
         '(scheme-font-lock-keywords
           nil t (("+-*/.<>=!?$%_&~^:" . "w")) beginning-of-defun
           (font-lock-comment-start-regexp . ";")
           (font-lock-mark-block-function . mark-defun)))
        ;; For TeX modes we could use `backward-paragraph' for the same reason.
        ;; But we don't, because paragraph breaks are arguably likely enough to
        ;; occur within a genuine syntactic block to make it too risky.
        ;; However, we do specify a MARK-BLOCK function as that cannot result
        ;; in a mis-fontification even if it might not fontify enough.  --sm.
        (tex-mode-defaults
         '(tex-font-lock-keywords nil nil ((?$ . "\"")) nil
           (font-lock-comment-start-regexp . "%")
           (font-lock-mark-block-function . mark-paragraph)))
        )
    (list
     (cons 'c++-c-mode                  c-mode-defaults)
     (cons 'c++-mode                    c++-mode-defaults)
     (cons 'c-mode                      c-mode-defaults)
     (cons 'elec-c-mode                 c-mode-defaults)
     (cons 'emacs-lisp-mode             lisp-mode-defaults)
     (cons 'inferior-scheme-mode        scheme-mode-defaults)
     (cons 'latex-mode                  tex-mode-defaults)
     (cons 'lisp-mode                   lisp-mode-defaults)
     (cons 'lisp-interaction-mode       lisp-mode-defaults)
     (cons 'plain-tex-mode              tex-mode-defaults)
     (cons 'scheme-mode                 scheme-mode-defaults)
     (cons 'scheme-interaction-mode     scheme-mode-defaults)
     (cons 'slitex-mode                 tex-mode-defaults)
     (cons 'tex-mode                    tex-mode-defaults)))
  "Alist of default major mode and Font Lock defaults.
Each item should be a list of the form:

 (MAJOR-MODE . (KEYWORDS KEYWORDS-ONLY CASE-FOLD SYNTAX-ALIST SYNTAX-BEGIN
                ...))

where MAJOR-MODE is a symbol.  KEYWORDS may be a symbol (a variable or function
whose value is the keywords to use for fontification) or a list of symbols.
If KEYWORDS-ONLY is non-nil, syntactic fontification (strings and comments) is
not performed.  If CASE-FOLD is non-nil, the case of the keywords is ignored
when fontifying.  If SYNTAX-ALIST is non-nil, it should be a list of cons pairs
of the form (CHAR-OR-STRING . STRING) used to set the local Font Lock syntax
table, for keyword and syntactic fontification (see `modify-syntax-entry').

If SYNTAX-BEGIN is non-nil, it should be a function with no args used to move
backwards outside any enclosing syntactic block, for syntactic fontification.
Typical values are `beginning-of-line' (i.e., the start of the line is known to
be outside a syntactic block), or `beginning-of-defun' for programming modes or
`backward-paragraph' for textual modes (i.e., the mode-dependent function is
known to move outside a syntactic block).  If nil, the beginning of the buffer
is used as a position outside of a syntactic block, in the worst case.

These item elements are used by Font Lock mode to set the variables
`font-lock-keywords', `font-lock-keywords-only',
`font-lock-keywords-case-fold-search', `font-lock-syntax-table' and
`font-lock-beginning-of-syntax-function', respectively.

Further item elements are alists of the form (VARIABLE . VALUE) and are in no
particular order.  Each VARIABLE is made buffer-local before set to VALUE.

Currently, appropriate variables include `font-lock-mark-block-function'.
If this is non-nil, it should be a function with no args used to mark any
enclosing block of text, for fontification via \\[font-lock-fontify-block].
Typical values are `mark-defun' for programming modes or `mark-paragraph' for
textual modes (i.e., the mode-dependent function is known to put point and mark
around a text block relevant to that mode).

Other variables include those for buffer-specialised fontification functions,
`font-lock-fontify-buffer-function', `font-lock-unfontify-buffer-function',
`font-lock-fontify-region-function', `font-lock-unfontify-region-function',
`font-lock-comment-start-regexp', `font-lock-inhibit-thing-lock' and
`font-lock-maximum-size'.")

(defvar font-lock-keywords-only nil
  "*Non-nil means Font Lock should not fontify comments or strings.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-keywords-case-fold-search nil
  "*Non-nil means the patterns in `font-lock-keywords' are case-insensitive.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-syntax-table nil
  "Non-nil means use this syntax table for fontifying.
If this is nil, the major mode's syntax table is used.
This is normally set via `font-lock-defaults'.")

;; If this is nil, we only use the beginning of the buffer if we can't use
;; `font-lock-cache-position' and `font-lock-cache-state'.
(defvar font-lock-beginning-of-syntax-function nil
  "*Non-nil means use this function to move back outside of a syntactic block.
When called with no args it should leave point at the beginning of any
enclosing syntactic block.
If this is nil, the beginning of the buffer is used (in the worst case).
This is normally set via `font-lock-defaults'.")

(defvar font-lock-mark-block-function nil
  "*Non-nil means use this function to mark a block of text.
When called with no args it should leave point at the beginning of any
enclosing textual block and mark at the end.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-comment-start-regexp nil
  "*Regexp to match the start of a comment.
This need not discriminate between genuine comments and quoted comment
characters or comment characters within strings.
If nil, `comment-start-skip' is used instead; see that variable for more info.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-fontify-buffer-function 'font-lock-default-fontify-buffer
  "Function to use for fontifying the buffer.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-unfontify-buffer-function 'font-lock-default-unfontify-buffer
  "Function to use for unfontifying the buffer.
This is used when turning off Font Lock mode.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-fontify-region-function 'font-lock-default-fontify-region
  "Function to use for fontifying a region.
It should take two args, the beginning and end of the region, and an optional
third arg VERBOSE.  If non-nil, the function should print status messages.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-unfontify-region-function 'font-lock-default-unfontify-region
  "Function to use for unfontifying a region.
It should take two args, the beginning and end of the region.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-inhibit-thing-lock nil
  "List of Font Lock mode related modes that should not be turned on.
Currently, valid mode names as `fast-lock-mode' and `lazy-lock-mode'.
This is normally set via `font-lock-defaults'.")

(defvar font-lock-mode nil)             ; For the modeline.
(defvar font-lock-fontified nil)        ; Whether we have fontified the buffer.

;;;###autoload
(defvar font-lock-mode-hook nil
  "Function or functions to run on entry to Font Lock mode.")
\f
;; Font Lock mode.

(eval-when-compile
  ;; We don't do this at the top-level as we only use non-autoloaded macros.
  (require 'cl))

;;;###autoload
(defun font-lock-mode (&optional arg)
  "Toggle Font Lock mode.
With arg, turn Font Lock mode on if and only if arg is positive.

When Font Lock mode is enabled, text is fontified as you type it:

 - Comments are displayed in `font-lock-comment-face';
 - Strings are displayed in `font-lock-string-face';
 - Certain other expressions are displayed in other faces according to the
   value of the variable `font-lock-keywords'.

You can enable Font Lock mode in any major mode automatically by turning on in
the major mode's hook.  For example, put in your ~/.emacs:

 (add-hook 'c-mode-hook 'turn-on-font-lock)

Alternatively, you can use Global Font Lock mode to automagically turn on Font
Lock mode in buffers whose major mode supports it and whose major mode is one
of `font-lock-global-modes'.  For example, put in your ~/.emacs:

 (global-font-lock-mode t)

There are a number of support modes that may be used to speed up Font Lock mode
in various ways, specified via the variable `font-lock-support-mode'.  Where
major modes support different levels of fontification, you can use the variable
`font-lock-maximum-decoration' to specify which level you generally prefer.
When you turn Font Lock mode on/off the buffer is fontified/defontified, though
fontification occurs only if the buffer is less than `font-lock-maximum-size'.

For example, to specify that Font Lock mode use use Lazy Lock mode as a support
mode and use maximum levels of fontification, put in your ~/.emacs:

 (setq font-lock-support-mode 'lazy-lock-mode)
 (setq font-lock-maximum-decoration t)

To fontify a buffer, without turning on Font Lock mode and regardless of buffer
size, you can use \\[font-lock-fontify-buffer].

To fontify a block (the function or paragraph containing point, or a number of
lines around point), perhaps because modification on the current line caused
syntactic change on other lines, you can use \\[font-lock-fontify-block].

The default Font Lock mode faces and their attributes are defined in the
variable `font-lock-face-attributes', and Font Lock mode default settings in
the variable `font-lock-defaults-alist'.  You can set your own default settings
for some mode, by setting a buffer local value for `font-lock-defaults', via
its mode hook."
  (interactive "P")
  ;; Don't turn on Font Lock mode if we don't have a display (we're running a
  ;; batch job) or if the buffer is invisible (the name starts with a space).
  (let ((on-p (and (not noninteractive)
                   (not (eq (aref (buffer-name) 0) ?\ ))
                   (if arg
                       (> (prefix-numeric-value arg) 0)
                     (not font-lock-mode)))))
    (set (make-local-variable 'font-lock-mode) on-p)
    ;; Turn on Font Lock mode.
    (when on-p
      (make-local-hook 'after-change-functions)
      (add-hook 'after-change-functions 'font-lock-after-change-function nil t)
      (font-lock-set-defaults)
      (font-lock-turn-on-thing-lock)
      (run-hooks 'font-lock-mode-hook)
      ;; Fontify the buffer if we have to.
      (let ((max-size (font-lock-value-in-major-mode font-lock-maximum-size)))
        (cond (font-lock-fontified
               nil)
              ((or (null max-size) (> max-size (buffer-size)))
               (font-lock-fontify-buffer))
              (font-lock-verbose
               (message "Fontifying %s...buffer too big" (buffer-name))))))
    ;; Turn off Font Lock mode.
    (when (not on-p)
      (remove-hook 'after-change-functions 'font-lock-after-change-function t)
      (font-lock-unfontify-buffer)
      (font-lock-turn-off-thing-lock)
      (font-lock-unset-defaults))
    (force-mode-line-update)))

;;;###autoload
(defun turn-on-font-lock ()
  "Turn on Font Lock mode conditionally.
Turn on only if the terminal can display it."
  (when window-system
    (font-lock-mode t)))
\f
;; Global Font Lock mode.
;;
;; A few people have hassled in the past for a way to make it easier to turn on
;; Font Lock mode, without the user needing to know for which modes s/he has to
;; turn it on, perhaps the same way hilit19.el/hl319.el does.  I've always
;; balked at that way, as I see it as just re-moulding the same problem in
;; another form.  That is; some person would still have to keep track of which
;; modes (which may not even be distributed with Emacs) support Font Lock mode.
;; The list would always be out of date.  And that person might have to be me.

;; Implementation.
;;
;; In a previous discussion the following hack came to mind.  It is a gross
;; hack, but it generally works.  We use the convention that major modes start
;; by calling the function `kill-all-local-variables', which in turn runs
;; functions on the hook variable `change-major-mode-hook'.  We attach our
;; function `font-lock-change-major-mode' to that hook.  Of course, when this
;; hook is run, the major mode is in the process of being changed and we do not
;; know what the final major mode will be.  So, `font-lock-change-major-mode'
;; only (a) notes the name of the current buffer, and (b) adds our function
;; `turn-on-font-lock-if-enabled' to the hook variables `find-file-hooks' and
;; `post-command-hook' (for buffers that are not visiting files).  By the time
;; the functions on the first of these hooks to be run are run, the new major
;; mode is assumed to be in place.  This way we get a Font Lock function run
;; when a major mode is turned on, without knowing major modes or their hooks.
;;
;; Naturally this requires that (a) major modes run `kill-all-local-variables',
;; as they are supposed to do, and (b) the major mode is in place after the
;; file is visited or the command that ran `kill-all-local-variables' has
;; finished, whichever the sooner.  Arguably, any major mode that does not
;; follow the convension (a) is broken, and I can't think of any reason why (b)
;; would not be met (except `gnudoit' on non-files).  However, it is not clean.
;;
;; Probably the cleanest solution is to have each major mode function run some
;; hook, e.g., `major-mode-hook', but maybe implementing that change is
;; impractical.  I am personally against making `setq' a macro or be advised,
;; or have a special function such as `set-major-mode', but maybe someone can
;; come up with another solution?

;; User interface.
;;
;; Although Global Font Lock mode is a pseudo-mode, I think that the user
;; interface should conform to the usual Emacs convention for modes, i.e., a
;; command to toggle the feature (`global-font-lock-mode') with a variable for
;; finer control of the mode's behaviour (`font-lock-global-modes').
;;
;; I don't think it is better that the feature be enabled via a variable, since
;; it does not conform to the usual convention.  I don't think the feature
;; should be enabled by loading font-lock.el, since other mechanisms such as
;; M-x font-lock-mode RET or (add-hook 'c-mode-hook 'turn-on-font-lock) would
;; cause Font Lock mode to be turned on everywhere, and it is not intuitive or
;; informative because loading a file tells you nothing about the feature or
;; how to control it.  It would be contrary to the Principle of Least Surprise.

(defvar font-lock-buffers nil)          ; For remembering buffers.
(defvar global-font-lock-mode nil)

;;;###autoload
(defvar font-lock-global-modes t
  "*Modes for which Font Lock mode is automagically turned on.
Global Font Lock mode is controlled by the `global-font-lock-mode' command.
If nil, means no modes have Font Lock mode automatically turned on.
If t, all modes that support Font Lock mode have it automatically turned on.
If a list, it should be a list of `major-mode' symbol names for which Font Lock
mode should be automatically turned on.  The sense of the list is negated if it
begins with `not'.  For example:
 (c-mode c++-mode)
means that Font Lock mode is turned on for buffers in C and C++ modes only.")

;;;###autoload
(defun global-font-lock-mode (&optional arg message)
  "Toggle Global Font Lock mode.
With prefix ARG, turn Global Font Lock mode on if and only if ARG is positive.
Displays a message saying whether the mode is on or off if MESSAGE is non-nil.
Returns the new status of Global Font Lock mode (non-nil means on).

When Global Font Lock mode is enabled, Font Lock mode is automagically
turned on in a buffer if its major mode is one of `font-lock-global-modes'."
  (interactive "P\np")
  (let ((off-p (if arg
                   (<= (prefix-numeric-value arg) 0)
                 global-font-lock-mode)))
    (if off-p
        (remove-hook 'find-file-hooks 'turn-on-font-lock-if-enabled)
      (add-hook 'find-file-hooks 'turn-on-font-lock-if-enabled)
      (add-hook 'post-command-hook 'turn-on-font-lock-if-enabled)
      (setq font-lock-buffers (buffer-list)))
    (when message
      (message "Global Font Lock mode is now %s." (if off-p "OFF" "ON")))
    (setq global-font-lock-mode (not off-p))))

(defun font-lock-change-major-mode ()
  ;; Turn off Font Lock mode if it's on.
  (when font-lock-mode
    (font-lock-mode nil))
  ;; Gross hack warning: Delicate readers should avert eyes now.
  ;; Something is running `kill-all-local-variables', which generally means the
  ;; major mode is being changed.  Run `turn-on-font-lock-if-enabled' after the
  ;; file is visited or the current command has finished.
  (when global-font-lock-mode
    (add-hook 'post-command-hook 'turn-on-font-lock-if-enabled)
    (add-to-list 'font-lock-buffers (current-buffer))))

(defun turn-on-font-lock-if-enabled ()
  ;; Gross hack warning: Delicate readers should avert eyes now.
  ;; Turn on Font Lock mode if it's supported by the major mode and enabled by
  ;; the user.
  (remove-hook 'post-command-hook 'turn-on-font-lock-if-enabled)
  (while font-lock-buffers
    (if (buffer-live-p (car font-lock-buffers))
        (save-excursion
          (set-buffer (car font-lock-buffers))
          (if (and (or font-lock-defaults
                       (assq major-mode font-lock-defaults-alist))
                   (or (eq font-lock-global-modes t)
                       (if (eq (car-safe font-lock-global-modes) 'not)
                           (not (memq major-mode (cdr font-lock-global-modes)))
                         (memq major-mode font-lock-global-modes))))
              (let (inhibit-quit)
                (turn-on-font-lock)))))
    (setq font-lock-buffers (cdr font-lock-buffers))))

(add-hook 'change-major-mode-hook 'font-lock-change-major-mode)

;; End of Global Font Lock mode.
\f
;; Font Lock Support mode.
;;
;; This is the code used to interface font-lock.el with any of its add-on
;; packages, and provide the user interface.  Packages that have their own
;; local buffer fontification functions (see below) may have to call
;; `font-lock-after-fontify-buffer' and/or `font-lock-after-unfontify-buffer'
;; themselves.

;;;###autoload
(defvar font-lock-support-mode nil
  "*Support mode for Font Lock mode.
Support modes speed up Font Lock mode by being choosy about when fontification
occurs.  Known support modes are Fast Lock mode (symbol `fast-lock-mode') and
Lazy Lock mode (symbol `lazy-lock-mode').  See those modes for more info.
If nil, means support for Font Lock mode is never performed.
If a symbol, use that support mode.
If a list, each element should be of the form (MAJOR-MODE . SUPPORT-MODE),
where MAJOR-MODE is a symbol or t (meaning the default).  For example:
 ((c-mode . fast-lock-mode) (c++-mode . fast-lock-mode) (t . lazy-lock-mode))
means that Fast Lock mode is used to support Font Lock mode for buffers in C or
C++ modes, and Lazy Lock mode is used to support Font Lock mode otherwise.

The value of this variable is used when Font Lock mode is turned on.")

(defun font-lock-turn-on-thing-lock ()
  (let ((thing-mode (font-lock-value-in-major-mode font-lock-support-mode)))
    (cond ((eq thing-mode 'fast-lock-mode)
           (fast-lock-mode t))
          ((eq thing-mode 'lazy-lock-mode)
           (lazy-lock-mode t)))))

(defvar fast-lock-mode nil)
(defvar lazy-lock-mode nil)

(defun font-lock-turn-off-thing-lock ()
  (cond (fast-lock-mode
         (fast-lock-mode nil))
        (lazy-lock-mode
         (lazy-lock-mode nil))))

(defun font-lock-after-fontify-buffer ()
  (cond (fast-lock-mode
         (fast-lock-after-fontify-buffer))
        (lazy-lock-mode
         (lazy-lock-after-fontify-buffer))))

(defun font-lock-after-unfontify-buffer ()
  (cond (fast-lock-mode
         (fast-lock-after-unfontify-buffer))
        (lazy-lock-mode
         (lazy-lock-after-unfontify-buffer))))

;; End of Font Lock Support mode.
\f
;; Fontification functions.

;;;###autoload
(defun font-lock-fontify-buffer ()
  "Fontify the current buffer the way `font-lock-mode' would."
  (interactive)
  (let ((font-lock-verbose (or font-lock-verbose (interactive-p))))
    (funcall font-lock-fontify-buffer-function)))

(defun font-lock-unfontify-buffer ()
  (funcall font-lock-unfontify-buffer-function))

(defun font-lock-fontify-region (beg end &optional loudly)
  (funcall font-lock-fontify-region-function beg end loudly))

(defun font-lock-unfontify-region (beg end)
  (funcall font-lock-unfontify-region-function beg end))

(defun font-lock-default-fontify-buffer ()
  (let ((verbose (if (numberp font-lock-verbose)
                     (> (buffer-size) font-lock-verbose)
                   font-lock-verbose)))
    (if verbose (message "Fontifying %s..." (buffer-name)))
    ;; Make sure we have the right `font-lock-keywords' etc.
    (if (not font-lock-mode) (font-lock-set-defaults))
    ;; Make sure we fontify etc. in the whole buffer.
    (save-restriction
      (widen)
      (condition-case nil
          (save-excursion
            (save-match-data
              (font-lock-fontify-region (point-min) (point-max) verbose)
              (font-lock-after-fontify-buffer)
              (setq font-lock-fontified t)))
        ;; We don't restore the old fontification, so it's best to unfontify.
        (quit (font-lock-unfontify-buffer))))
    (if verbose (message "Fontifying %s...%s" (buffer-name)
                         (if font-lock-fontified "done" "aborted")))))

(defun font-lock-default-unfontify-buffer ()
  (save-restriction
    (widen)
    (font-lock-unfontify-region (point-min) (point-max))
    (font-lock-after-unfontify-buffer)
    (setq font-lock-fontified nil)))

;; We use this wrapper.  However, `font-lock-fontify-region' used to be the
;; name used for `font-lock-fontify-syntactically-region', so a change isn't
;; back-compatible.  But you shouldn't be calling these directly, should you?
(defun font-lock-default-fontify-region (beg end loudly)
  (let ((modified (buffer-modified-p))
        (buffer-undo-list t) (inhibit-read-only t)
        (old-syntax-table (syntax-table))
        before-change-functions after-change-functions
        buffer-file-name buffer-file-truename)
    (unwind-protect
        (save-restriction
          (widen)
          ;; Use the fontification syntax table, if any.
          (if font-lock-syntax-table (set-syntax-table font-lock-syntax-table))
          ;; Now do the fontification.
          (if font-lock-keywords-only
              (font-lock-unfontify-region beg end)
            (font-lock-fontify-syntactically-region beg end loudly))
          (font-lock-fontify-keywords-region beg end loudly))
      ;; Clean up.
      (set-syntax-table old-syntax-table)
      (and (not modified) (buffer-modified-p) (set-buffer-modified-p nil)))))

;; The following must be rethought, since keywords can override fontification.
;      ;; Now scan for keywords, but not if we are inside a comment now.
;      (or (and (not font-lock-keywords-only)
;              (let ((state (parse-partial-sexp beg end nil nil 
;                                               font-lock-cache-state)))
;                (or (nth 4 state) (nth 7 state))))
;         (font-lock-fontify-keywords-region beg end))

(defun font-lock-default-unfontify-region (beg end)
  (let ((modified (buffer-modified-p))
        (buffer-undo-list t) (inhibit-read-only t)
        before-change-functions after-change-functions
        buffer-file-name buffer-file-truename)
    (remove-text-properties beg end '(face nil))
    (and (not modified) (buffer-modified-p) (set-buffer-modified-p nil))))

;; Called when any modification is made to buffer text.
(defun font-lock-after-change-function (beg end old-len)
  (save-excursion
    (save-match-data
      ;; Rescan between start of line from `beg' and start of line after `end'.
      (font-lock-fontify-region
       (progn (goto-char beg) (beginning-of-line) (point))
       (progn (goto-char end) (forward-line 1) (point))))))

(defun font-lock-fontify-block (&optional arg)
  "Fontify some lines the way `font-lock-fontify-buffer' would.
The lines could be a function or paragraph, or a specified number of lines.
If ARG is given, fontify that many lines before and after point, or 16 lines if
no ARG is given and `font-lock-mark-block-function' is nil.
If `font-lock-mark-block-function' non-nil and no ARG is given, it is used to
delimit the region to fontify."
  (interactive "P")
  (let (font-lock-beginning-of-syntax-function deactivate-mark)
    ;; Make sure we have the right `font-lock-keywords' etc.
    (if (not font-lock-mode) (font-lock-set-defaults))
    (save-excursion
      (save-match-data
        (condition-case error-data
            (if (or arg (not font-lock-mark-block-function))
                (let ((lines (if arg (prefix-numeric-value arg) 16)))
                  (font-lock-fontify-region
                   (save-excursion (forward-line (- lines)) (point))
                   (save-excursion (forward-line lines) (point))))
              (funcall font-lock-mark-block-function)
              (font-lock-fontify-region (point) (mark)))
          ((error quit) (message "Fontifying block...%s" error-data)))))))

(define-key facemenu-keymap "\M-g" 'font-lock-fontify-block)
\f
;; Syntactic fontification functions.

;; These record the parse state at a particular position, always the start of a
;; line.  Used to make `font-lock-fontify-syntactically-region' faster.
(defvar font-lock-cache-position nil)
(defvar font-lock-cache-state nil)
(make-variable-buffer-local 'font-lock-cache-position)
(make-variable-buffer-local 'font-lock-cache-state)

(defun font-lock-fontify-syntactically-region (start end &optional loudly)
  "Put proper face on each string and comment between START and END.
START should be at the beginning of a line."
  (let ((synstart (cond (font-lock-comment-start-regexp
                         (concat "\\s\"\\|" font-lock-comment-start-regexp))
                        (comment-start-skip
                         (concat "\\s\"\\|" comment-start-skip))
                        (t
                         "\\s\"")))
        (comstart (cond (font-lock-comment-start-regexp
                         font-lock-comment-start-regexp)
                        (comment-start-skip
                         (concat "\\s<\\|" comment-start-skip))
                        (t
                         "\\s<")))
        state prev prevstate)
    (if loudly (message "Fontifying %s... (syntactically...)" (buffer-name)))
    (goto-char start)
    ;;
    ;; Find the state at the `beginning-of-line' before `start'.
    (if (eq start font-lock-cache-position)
        ;; Use the cache for the state of `start'.
        (setq state font-lock-cache-state)
      ;; Find the state of `start'.
      (if (null font-lock-beginning-of-syntax-function)
          ;; Use the state at the previous cache position, if any, or
          ;; otherwise calculate from `point-min'.
          (if (or (null font-lock-cache-position)
                  (< start font-lock-cache-position))
              (setq state (parse-partial-sexp (point-min) start))
            (setq state (parse-partial-sexp font-lock-cache-position start
                                            nil nil font-lock-cache-state)))
        ;; Call the function to move outside any syntactic block.
        (funcall font-lock-beginning-of-syntax-function)
        (setq state (parse-partial-sexp (point) start)))
      ;; Cache the state and position of `start'.
      (setq font-lock-cache-state state
            font-lock-cache-position start))
    ;;
    ;; If the region starts inside a string, show the extent of it.
    (if (nth 3 state)
        (let ((beg (point)))
          (while (and (re-search-forward "\\s\"" end 'move)
                      (nth 3 (parse-partial-sexp beg (point) nil nil state))))
          (put-text-property beg (point) 'face font-lock-string-face)
          (setq state (parse-partial-sexp beg (point) nil nil state))))
    ;;
    ;; Likewise for a comment.
    (if (or (nth 4 state) (nth 7 state))
        (let ((beg (point)))
          (save-restriction
            (narrow-to-region (point-min) end)
            (condition-case nil
                (progn
                  (re-search-backward comstart (point-min) 'move)
                  (forward-comment 1)
                  ;; forward-comment skips all whitespace,
                  ;; so go back to the real end of the comment.
                  (skip-chars-backward " \t"))
              (error (goto-char end))))
          (put-text-property beg (point) 'face font-lock-comment-face)
          (setq state (parse-partial-sexp beg (point) nil nil state))))
    ;;
    ;; Find each interesting place between here and `end'.
    (while (and (< (point) end)
                (setq prev (point) prevstate state)
                (re-search-forward synstart end t)
                (progn
                  ;; Clear out the fonts of what we skip over.
                  (remove-text-properties prev (point) '(face nil))
                  ;; Verify the state at that place
                  ;; so we don't get fooled by \" or \;.
                  (setq state (parse-partial-sexp prev (point)
                                                  nil nil state))))
      (let ((here (point)))
        (if (or (nth 4 state) (nth 7 state))
            ;;
            ;; We found a real comment start.
            (let ((beg (or (match-end 1) (match-beginning 0))))
              (goto-char beg)
              (save-restriction
                (narrow-to-region (point-min) end)
                (condition-case nil
                    (progn
                      (forward-comment 1)
                      ;; forward-comment skips all whitespace,
                      ;; so go back to the real end of the comment.
                      (skip-chars-backward " \t"))
                  (error (goto-char end))))
              (put-text-property beg (point) 'face font-lock-comment-face)
              (setq state (parse-partial-sexp here (point) nil nil state)))
          (if (nth 3 state)
              ;;
              ;; We found a real string start.
              (let ((beg (or (match-end 1) (match-beginning 0))))
                (while (and (re-search-forward "\\s\"" end 'move)
                            (nth 3 (parse-partial-sexp here (point)
                                                       nil nil state))))
                (put-text-property beg (point) 'face font-lock-string-face)
                (setq state (parse-partial-sexp here (point)
                                                nil nil state))))))
      ;;
      ;; Make sure `prev' is non-nil after the loop
      ;; only if it was set on the very last iteration.
      (setq prev nil))
    ;;
    ;; Clean up.
    (and prev (remove-text-properties prev end '(face nil)))))
\f
;;; Additional text property functions.

;; The following three text property functions are not generally available (and
;; it's not certain that they should be) so they are inlined for speed.
;; The case for `fillin-text-property' is simple; it may or not be generally
;; useful.  (Since it is used here, it is useful in at least one place.;-)
;; However, the case for `append-text-property' and `prepend-text-property' is
;; more complicated.  Should they remove duplicate property values or not?  If
;; so, should the first or last duplicate item remain?  Or the one that was
;; added?  In our implementation, the first duplicate remains.

(defsubst font-lock-fillin-text-property (start end prop value &optional object)
  "Fill in one property of the text from START to END.
Arguments PROP and VALUE specify the property and value to put where none are
already in place.  Therefore existing property values are not overwritten.
Optional argument OBJECT is the string or buffer containing the text."
  (let ((start (text-property-any start end prop nil object)) next)
    (while start
      (setq next (next-single-property-change start prop object end))
      (put-text-property start next prop value object)
      (setq start (text-property-any next end prop nil object)))))

;; This function (from simon's unique.el) is rewritten and inlined for speed.
;(defun unique (list function)
;  "Uniquify LIST, deleting elements using FUNCTION.
;Return the list with subsequent duplicate items removed by side effects.
;FUNCTION is called with an element of LIST and a list of elements from LIST,
;and should return the list of elements with occurrences of the element removed,
;i.e., a function such as `delete' or `delq'.
;This function will work even if LIST is unsorted.  See also `uniq'."
;  (let ((list list))
;    (while list
;      (setq list (setcdr list (funcall function (car list) (cdr list))))))
;  list)

(defsubst font-lock-unique (list)
  "Uniquify LIST, deleting elements using `delq'.
Return the list with subsequent duplicate items removed by side effects."
  (let ((list list))
    (while list
      (setq list (setcdr list (delq (car list) (cdr list))))))
  list)

;; A generalisation of `facemenu-add-face' for any property, but without the
;; removal of inactive faces via `facemenu-discard-redundant-faces' and special
;; treatment of `default'.  Uses `unique' to remove duplicate property values.
(defsubst font-lock-prepend-text-property (start end prop value &optional object)
  "Prepend to one property of the text from START to END.
Arguments PROP and VALUE specify the property and value to prepend to the value
already in place.  The resulting property values are always lists, and unique.
Optional argument OBJECT is the string or buffer containing the text."
  (let ((val (if (listp value) value (list value))) next prev)
    (while (/= start end)
      (setq next (next-single-property-change start prop object end)
            prev (get-text-property start prop object))
      (put-text-property
       start next prop
       (font-lock-unique (append val (if (listp prev) prev (list prev))))
       object)
      (setq start next))))

(defsubst font-lock-append-text-property (start end prop value &optional object)
  "Append to one property of the text from START to END.
Arguments PROP and VALUE specify the property and value to append to the value
already in place.  The resulting property values are always lists, and unique.
Optional argument OBJECT is the string or buffer containing the text."
  (let ((val (if (listp value) value (list value))) next prev)
    (while (/= start end)
      (setq next (next-single-property-change start prop object end)
            prev (get-text-property start prop object))
      (put-text-property
       start next prop
       (font-lock-unique (append (if (listp prev) prev (list prev)) val))
       object)
      (setq start next))))
\f
;;; Regexp fontification functions.

(defsubst font-lock-apply-highlight (highlight)
  "Apply HIGHLIGHT following a match.
HIGHLIGHT should be of the form MATCH-HIGHLIGHT, see `font-lock-keywords'."
  (let* ((match (nth 0 highlight))
         (start (match-beginning match)) (end (match-end match))
         (override (nth 2 highlight)))
    (cond ((not start)
           ;; No match but we might not signal an error.
           (or (nth 3 highlight)
               (error "No match %d in highlight %S" match highlight)))
          ((not override)
           ;; Cannot override existing fontification.
           (or (text-property-not-all start end 'face nil)
               (put-text-property start end 'face (eval (nth 1 highlight)))))
          ((eq override t)
           ;; Override existing fontification.
           (put-text-property start end 'face (eval (nth 1 highlight))))
          ((eq override 'keep)
           ;; Keep existing fontification.
           (font-lock-fillin-text-property start end 'face
                                           (eval (nth 1 highlight))))
          ((eq override 'prepend)
           ;; Prepend to existing fontification.
           (font-lock-prepend-text-property start end 'face
                                            (eval (nth 1 highlight))))
          ((eq override 'append)
           ;; Append to existing fontification.
           (font-lock-append-text-property start end 'face
                                           (eval (nth 1 highlight)))))))

(defsubst font-lock-fontify-anchored-keywords (keywords limit)
  "Fontify according to KEYWORDS until LIMIT.
KEYWORDS should be of the form MATCH-ANCHORED, see `font-lock-keywords'."
  (let ((matcher (nth 0 keywords)) (lowdarks (nthcdr 3 keywords)) highlights)
    ;; Until we come up with a cleaner solution, we make LIMIT the end of line.
    (save-excursion (end-of-line) (setq limit (min limit (point))))
    ;; Evaluate PRE-MATCH-FORM.
    (eval (nth 1 keywords))
    (save-match-data
      ;; Find an occurrence of `matcher' before `limit'.
      (while (if (stringp matcher)
                 (re-search-forward matcher limit t)
               (funcall matcher limit))
        ;; Apply each highlight to this instance of `matcher'.
        (setq highlights lowdarks)
        (while highlights
          (font-lock-apply-highlight (car highlights))
          (setq highlights (cdr highlights)))))
    ;; Evaluate POST-MATCH-FORM.
    (eval (nth 2 keywords))))

(defun font-lock-fontify-keywords-region (start end &optional loudly)
  "Fontify according to `font-lock-keywords' between START and END.
START should be at the beginning of a line."
  (let ((case-fold-search font-lock-keywords-case-fold-search)
        (keywords (cdr (if (eq (car-safe font-lock-keywords) t)
                           font-lock-keywords
                         (font-lock-compile-keywords))))
        (bufname (buffer-name)) (count 0)
        keyword matcher highlights)
    ;;
    ;; Fontify each item in `font-lock-keywords' from `start' to `end'.
    (while keywords
      (if loudly (message "Fontifying %s... (regexps..%s)" bufname
                          (make-string (setq count (1+ count)) ?.)))
      ;;
      ;; Find an occurrence of `matcher' from `start' to `end'.
      (setq keyword (car keywords) matcher (car keyword))
      (goto-char start)
      (while (if (stringp matcher)
                 (re-search-forward matcher end t)
               (funcall matcher end))
        ;; Apply each highlight to this instance of `matcher', which may be
        ;; specific highlights or more keywords anchored to `matcher'.
        (setq highlights (cdr keyword))
        (while highlights
          (if (numberp (car (car highlights)))
              (font-lock-apply-highlight (car highlights))
            (font-lock-fontify-anchored-keywords (car highlights) end))
          (setq highlights (cdr highlights))))
      (setq keywords (cdr keywords)))))
\f
;; Various functions.

(defun font-lock-compile-keywords (&optional keywords)
  ;; Compile `font-lock-keywords' into the form (t KEYWORD ...) where KEYWORD
  ;; is the (MATCHER HIGHLIGHT ...) shown in the variable's doc string.
  (let ((keywords (or keywords font-lock-keywords)))
    (setq font-lock-keywords 
          (if (eq (car-safe keywords) t)
              keywords
            (cons t (mapcar 'font-lock-compile-keyword keywords))))))

(defun font-lock-compile-keyword (keyword)
  (cond ((nlistp keyword)               ; Just MATCHER
         (list keyword '(0 font-lock-keyword-face)))
        ((eq (car keyword) 'eval)       ; Specified (eval . FORM)
         (font-lock-compile-keyword (eval (cdr keyword))))
        ((numberp (cdr keyword))        ; Specified (MATCHER . MATCH)
         (list (car keyword) (list (cdr keyword) 'font-lock-keyword-face)))
        ((symbolp (cdr keyword))        ; Specified (MATCHER . FACENAME)
         (list (car keyword) (list 0 (cdr keyword))))
        ((nlistp (nth 1 keyword))       ; Specified (MATCHER . HIGHLIGHT)
         (list (car keyword) (cdr keyword)))
        (t                              ; Hopefully (MATCHER HIGHLIGHT ...)
         keyword)))

(defun font-lock-value-in-major-mode (alist)
  ;; Return value in ALIST for `major-mode', or ALIST if it is not an alist.
  ;; Alist structure is ((MAJOR-MODE . VALUE)) where MAJOR-MODE may be t.
  (if (consp alist)
      (cdr (or (assq major-mode alist) (assq t alist)))
    alist))

(defun font-lock-choose-keywords (keywords level)
  ;; Return LEVELth element of KEYWORDS.  A LEVEL of nil is equal to a
  ;; LEVEL of 0, a LEVEL of t is equal to (1- (length KEYWORDS)).
  (cond ((symbolp keywords)
         keywords)
        ((numberp level)
         (or (nth level keywords) (car (reverse keywords))))
        ((eq level t)
         (car (reverse keywords)))
        (t
         (car keywords))))

(defun font-lock-set-defaults ()
  "Set fontification defaults appropriately for this mode.
Sets various variables using `font-lock-defaults' (or, if nil, using
`font-lock-defaults-alist') and `font-lock-maximum-decoration'."
  ;; Set face defaults.
  (font-lock-make-faces)
  ;; Set fontification defaults.
  (make-local-variable 'font-lock-fontified)
  (if (member font-lock-keywords '(nil (t)))
      (let* ((defaults (or font-lock-defaults
                           (cdr (assq major-mode font-lock-defaults-alist))))
             (keywords
              (font-lock-choose-keywords (nth 0 defaults)
               (font-lock-value-in-major-mode font-lock-maximum-decoration))))
        ;; Regexp fontification?
        (setq font-lock-keywords (if (fboundp keywords)
                                     (funcall keywords)
                                   (eval keywords)))
        ;; Syntactic fontification?
        (if (nth 1 defaults)
            (set (make-local-variable 'font-lock-keywords-only) t))
        ;; Case fold during regexp fontification?
        (if (nth 2 defaults)
            (set (make-local-variable 'font-lock-keywords-case-fold-search) t))
        ;; Syntax table for regexp and syntactic fontification?
        (if (nth 3 defaults)
            (let ((slist (nth 3 defaults)))
              (set (make-local-variable 'font-lock-syntax-table)
                   (copy-syntax-table (syntax-table)))
              (while slist
                ;; The character to modify may be a single CHAR or a STRING.
                (let ((chars (if (numberp (car (car slist)))
                                 (list (car (car slist)))
                               (mapcar 'identity (car (car slist)))))
                      (syntax (cdr (car slist))))
                  (while chars
                    (modify-syntax-entry (car chars) syntax
                                         font-lock-syntax-table)
                    (setq chars (cdr chars)))
                  (setq slist (cdr slist))))))
        ;; Syntax function for syntactic fontification?
        (if (nth 4 defaults)
            (set (make-local-variable 'font-lock-beginning-of-syntax-function)
                 (nth 4 defaults)))
        ;; Variable alist?
        (let ((alist (nthcdr 5 defaults)))
          (while alist
            (set (make-local-variable (car (car alist))) (cdr (car alist)))
            (setq alist (cdr alist)))))))

(defun font-lock-unset-defaults ()
  "Unset fontification defaults.  See `font-lock-set-defaults'."
  (setq font-lock-keywords                      nil
        font-lock-keywords-only                 nil
        font-lock-keywords-case-fold-search     nil
        font-lock-syntax-table                  nil
        font-lock-beginning-of-syntax-function  nil)
  (let* ((defaults (or font-lock-defaults
                       (cdr (assq major-mode font-lock-defaults-alist))))
         (alist (nthcdr 5 defaults)))
    (while alist
      (set (car (car alist)) (default-value (car (car alist))))
      (setq alist (cdr alist)))))
\f
;; Colour etc. support.

;; This section of code is crying out for revision.

;; To begin with, `display-type' and `background-mode' are `frame-parameters'
;; so we don't have to calculate them here anymore.  But all the face stuff
;; should be frame-local (and thus display-local) anyway.  Because we're not
;; sure what support Emacs is going to have for general frame-local face
;; attributes, we leave this section of code as it is.  For now.  --sm.

(defvar font-lock-display-type nil
  "A symbol indicating the display Emacs is running under.
The symbol should be one of `color', `grayscale' or `mono'.
If Emacs guesses this display attribute wrongly, either set this variable in
your `~/.emacs' or set the resource `Emacs.displayType' in your `~/.Xdefaults'.
See also `font-lock-background-mode' and `font-lock-face-attributes'.")

(defvar font-lock-background-mode nil
  "A symbol indicating the Emacs background brightness.
The symbol should be one of `light' or `dark'.
If Emacs guesses this frame attribute wrongly, either set this variable in
your `~/.emacs' or set the resource `Emacs.backgroundMode' in your
`~/.Xdefaults'.
See also `font-lock-display-type' and `font-lock-face-attributes'.")

(defvar font-lock-face-attributes nil
  "A list of default attributes to use for face attributes.
Each element of the list should be of the form

 (FACE FOREGROUND BACKGROUND BOLD-P ITALIC-P UNDERLINE-P)

where FACE should be one of the face symbols `font-lock-comment-face',
`font-lock-string-face', `font-lock-keyword-face', `font-lock-type-face',
`font-lock-function-name-face', `font-lock-variable-name-face', and
`font-lock-reference-face'.  A form for each of these face symbols should be
provided in the list, but other face symbols and attributes may be given and
used in highlighting.  See `font-lock-keywords'.

Subsequent element items should be the attributes for the corresponding
Font Lock mode faces.  Attributes FOREGROUND and BACKGROUND should be strings
\(default if nil), while BOLD-P, ITALIC-P, and UNDERLINE-P should specify the
corresponding face attributes (yes if non-nil).

Emacs uses default attributes based on display type and background brightness.
See variables `font-lock-display-type' and `font-lock-background-mode'.

Resources can be used to over-ride these face attributes.  For example, the
resource `Emacs.font-lock-comment-face.attributeUnderline' can be used to
specify the UNDERLINE-P attribute for face `font-lock-comment-face'.")

(defun font-lock-make-faces (&optional override)
  "Make faces from `font-lock-face-attributes'.
A default list is used if this is nil.
If optional OVERRIDE is non-nil, faces that already exist are reset.
See `font-lock-make-face' and `list-faces-display'."
  ;; We don't need to `setq' any of these variables, but the user can see what
  ;; is being used if we do.
  (if (null font-lock-display-type)
      (setq font-lock-display-type
            (let ((display-resource (x-get-resource ".displayType"
                                                    "DisplayType")))
              (cond (display-resource (intern (downcase display-resource)))
                    ((x-display-color-p) 'color)
                    ((x-display-grayscale-p) 'grayscale)
                    (t 'mono)))))
  (if (null font-lock-background-mode)
      (setq font-lock-background-mode
            (let ((bg-resource (x-get-resource ".backgroundMode"
                                               "BackgroundMode"))
                  (params (frame-parameters)))
              (cond (bg-resource (intern (downcase bg-resource)))
                    ((eq system-type 'ms-dos)
                     (if (string-match "light"
                                       (cdr (assq 'background-color params)))
                         'light
                       'dark))
                    ((< (apply '+ (x-color-values
                                   (cdr (assq 'background-color params))))
                        (* (apply '+ (x-color-values "white")) .6))
                     'dark)
                    (t 'light)))))
  (if (null font-lock-face-attributes)
      (setq font-lock-face-attributes
            (let ((light-bg (eq font-lock-background-mode 'light)))
              (cond ((memq font-lock-display-type '(mono monochrome))
                     ;; Emacs 19.25's font-lock defaults:
                     ;;'((font-lock-comment-face nil nil nil t nil)
                     ;;  (font-lock-string-face nil nil nil nil t)
                     ;;  (font-lock-keyword-face nil nil t nil nil)
                     ;;  (font-lock-function-name-face nil nil t t nil)
                     ;;  (font-lock-type-face nil nil nil t nil))
                     (list '(font-lock-comment-face nil nil t t nil)
                           '(font-lock-string-face nil nil nil t nil)
                           '(font-lock-keyword-face nil nil t nil nil)
                           (list
                            'font-lock-function-name-face
                            (cdr (assq 'background-color (frame-parameters)))
                            (cdr (assq 'foreground-color (frame-parameters)))
                            t nil nil)
                           '(font-lock-variable-name-face nil nil t t nil)
                           '(font-lock-type-face nil nil t nil t)
                           '(font-lock-reference-face nil nil t nil t)))
                    ((memq font-lock-display-type '(grayscale greyscale
                                                    grayshade greyshade))
                     (list
                      (list 'font-lock-comment-face
                            nil (if light-bg "Gray80" "DimGray") t t nil)
                      (list 'font-lock-string-face
                            nil (if light-bg "Gray50" "LightGray") nil t nil)
                      (list 'font-lock-keyword-face
                            nil (if light-bg "Gray90" "DimGray") t nil nil)
                      (list 'font-lock-function-name-face
                            (cdr (assq 'background-color (frame-parameters)))
                            (cdr (assq 'foreground-color (frame-parameters)))
                            t nil nil)
                      (list 'font-lock-variable-name-face
                            nil (if light-bg "Gray90" "DimGray") t t nil)
                      (list 'font-lock-type-face
                            nil (if light-bg "Gray80" "DimGray") t nil t)
                      (list 'font-lock-reference-face
                            nil (if light-bg "LightGray" "Gray50") t nil t)))
                    (light-bg           ; light colour background
                     '((font-lock-comment-face "Firebrick")
                       (font-lock-string-face "RosyBrown")
                       (font-lock-keyword-face "Purple")
                       (font-lock-function-name-face "Blue")
                       (font-lock-variable-name-face "DarkGoldenrod")
                       (font-lock-type-face "DarkOliveGreen")
                       (font-lock-reference-face "CadetBlue")))
                    (t                  ; dark colour background
                     '((font-lock-comment-face "OrangeRed")
                       (font-lock-string-face "LightSalmon")
                       (font-lock-keyword-face "LightSteelBlue")
                       (font-lock-function-name-face "LightSkyBlue")
                       (font-lock-variable-name-face "LightGoldenrod")
                       (font-lock-type-face "PaleGreen")
                       (font-lock-reference-face "Aquamarine")))))))
  ;; Now make the faces if we have to.
  (mapcar (function
           (lambda (face-attributes)
             (let ((face (nth 0 face-attributes)))
               (cond (override
                      ;; We can stomp all over it anyway.  Get outta my face!
                      (font-lock-make-face face-attributes))
                     ((and (boundp face) (facep (symbol-value face)))
                      ;; The variable exists and is already bound to a face.
                      nil)
                     ((facep face)
                      ;; We already have a face so we bind the variable to it.
                      (set face face))
                     (t
                      ;; No variable or no face.
                      (font-lock-make-face face-attributes))))))
          font-lock-face-attributes))

(defun font-lock-make-face (face-attributes)
  "Make a face from FACE-ATTRIBUTES.
FACE-ATTRIBUTES should be like an element `font-lock-face-attributes', so that
the face name is the first item in the list.  A variable with the same name as
the face is also set; its value is the face name."
  (let* ((face (nth 0 face-attributes))
         (face-name (symbol-name face))
         (set-p (function (lambda (face-name resource)
                 (x-get-resource (concat face-name ".attribute" resource)
                                 (concat "Face.Attribute" resource)))))
         (on-p (function (lambda (face-name resource)
                (let ((set (funcall set-p face-name resource)))
                  (and set (member (downcase set) '("on" "true"))))))))
    (make-face face)
    (add-to-list 'facemenu-unlisted-faces face)
    ;; Set attributes not set from X resources (and therefore `make-face').
    (or (funcall set-p face-name "Foreground")
        (condition-case nil
            (set-face-foreground face (nth 1 face-attributes))
          (error nil)))
    (or (funcall set-p face-name "Background")
        (condition-case nil
            (set-face-background face (nth 2 face-attributes))
          (error nil)))
    (if (funcall set-p face-name "Bold")
        (and (funcall on-p face-name "Bold") (make-face-bold face nil t))
      (and (nth 3 face-attributes) (make-face-bold face nil t)))
    (if (funcall set-p face-name "Italic")
        (and (funcall on-p face-name "Italic") (make-face-italic face nil t))
      (and (nth 4 face-attributes) (make-face-italic face nil t)))
    (or (funcall set-p face-name "Underline")
        (set-face-underline-p face (nth 5 face-attributes)))
    (set face face)))
\f
;;; Various regexp information shared by several modes.
;;; Information specific to a single mode should go in its load library.

(defconst lisp-font-lock-keywords-1
  (list
   ;; Anything not a variable or type declaration is fontified as a function.
   ;; It would be cleaner to allow preceding whitespace, but it would also be
   ;; about five times slower.
   (list (concat "^(\\(def\\("
                 ;; Variable declarations.
                 "\\(const\\(\\|ant\\)\\|ine-key\\(\\|-after\\)\\|var\\)\\|"
                 ;; Structure declarations.
                 "\\(class\\|struct\\|type\\)\\|"
                 ;; Everything else is a function declaration.
                 "\\([^ \t\n\(\)]+\\)"
                 "\\)\\)\\>"
                 ;; Any whitespace and declared object.
                 "[ \t'\(]*"
                 "\\(\\sw+\\)?")
         '(1 font-lock-keyword-face)
         '(8 (cond ((match-beginning 3) font-lock-variable-name-face)
                   ((match-beginning 6) font-lock-type-face)
                   (t font-lock-function-name-face))
             nil t))
   )
 "Subdued level highlighting for Lisp modes.")

(defconst lisp-font-lock-keywords-2
  (append lisp-font-lock-keywords-1
   (list
    ;;
    ;; Control structures.  ELisp and CLisp combined.
;      (make-regexp
;       '("cond" "if" "while" "let\\*?" "prog[nv12*]?" "inline" "catch" "throw"
;        "save-restriction" "save-excursion" "save-window-excursion"
;        "save-selected-window" "save-match-data" "unwind-protect"
;        "condition-case" "track-mouse"
;        "eval-after-load" "eval-and-compile" "eval-when-compile"
;        "when" "unless" "do" "flet" "labels" "return" "return-from"
;        "with-output-to-temp-buffer" "with-timeout"))
    (cons
     (concat
      "(\\("
      "c\\(atch\\|ond\\(\\|ition-case\\)\\)\\|do\\|"
      "eval-\\(a\\(fter-load\\|nd-compile\\)\\|when-compile\\)\\|flet\\|"
      "i\\(f\\|nline\\)\\|l\\(abels\\|et\\*?\\)\\|prog[nv12*]?\\|"
      "return\\(\\|-from\\)\\|save-\\(excursion\\|match-data\\|restriction\\|"
      "selected-window\\|window-excursion\\)\\|t\\(hrow\\|rack-mouse\\)\\|"
      "un\\(less\\|wind-protect\\)\\|"
      "w\\(h\\(en\\|ile\\)\\|ith-\\(output-to-temp-buffer\\|timeout\\)\\)"
      "\\)\\>") 1)
    ;;
    ;; Feature symbols as references.
    '("(\\(featurep\\|provide\\|require\\)\\>[ \t']*\\(\\sw+\\)?"
      (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
    ;;
    ;; Words inside \\[] tend to be for `substitute-command-keys'.
    '("\\\\\\\\\\[\\(\\sw+\\)]" 1 font-lock-reference-face prepend)
    ;;
    ;; Words inside `' tend to be symbol names.
    '("`\\(\\sw\\sw+\\)'" 1 font-lock-reference-face prepend)
    ;;
    ;; CLisp `:' keywords as references.
    '("\\<:\\sw+\\>" 0 font-lock-reference-face prepend)
    ;;
    ;; ELisp and CLisp `&' keywords as types.
    '("\\<\\&\\sw+\\>" . font-lock-type-face)
    ))
  "Gaudy level highlighting for Lisp modes.")

(defvar lisp-font-lock-keywords lisp-font-lock-keywords-1
  "Default expressions to highlight in Lisp modes.")


(defvar scheme-font-lock-keywords
  (eval-when-compile
    (list
     ;;
     ;; Declarations.  Hannes Haug <hannes.haug@student.uni-tuebingen.de> says
     ;; this works for SOS, STklos, SCOOPS, Meroon and Tiny CLOS.
     (list (concat "(\\(define\\("
                   ;; Function names.
                   "\\(\\|-\\(generic\\(\\|-procedure\\)\\|method\\)\\)\\|"
                   ;; Macro names, as variable names.  A bit dubious, this.
                   "\\(-syntax\\)\\|"
                   ;; Class names.
                   "\\(-class\\)"
                   "\\)\\)\\>"
                   ;; Any whitespace and declared object.
                   "[ \t]*(?"
                   "\\(\\sw+\\)?")
           '(1 font-lock-keyword-face)
           '(8 (cond ((match-beginning 3) font-lock-function-name-face)
                     ((match-beginning 6) font-lock-variable-name-face)
                     (t font-lock-type-face))
               nil t))
     ;;
     ;; Control structures.
;(make-regexp '("begin" "call-with-current-continuation" "call/cc"
;              "call-with-input-file" "call-with-output-file" "case" "cond"
;              "do" "else" "for-each" "if" "lambda"
;              "let\\*?" "let-syntax" "letrec" "letrec-syntax"
;              ;; Hannes Haug <hannes.haug@student.uni-tuebingen.de> wants:
;              "and" "or" "delay"
;              ;; Stefan Monnier <stefan.monnier@epfl.ch> says don't bother:
;              ;;"quasiquote" "quote" "unquote" "unquote-splicing"
;              "map" "syntax" "syntax-rules"))
     (cons
      (concat "(\\("
              "and\\|begin\\|c\\(a\\(ll\\(-with-\\(current-continuation\\|"
              "input-file\\|output-file\\)\\|/cc\\)\\|se\\)\\|ond\\)\\|"
              "d\\(elay\\|o\\)\\|else\\|for-each\\|if\\|"
              "l\\(ambda\\|et\\(-syntax\\|\\*?\\|rec\\(\\|-syntax\\)\\)\\)\\|"
              "map\\|or\\|syntax\\(\\|-rules\\)"
              "\\)\\>") 1)
     ;;
     ;; David Fox <fox@graphics.cs.nyu.edu> for SOS/STklos class specifiers.
     '("\\<<\\sw+>\\>" . font-lock-type-face)
     ;;
     ;; Scheme `:' keywords as references.
     '("\\<:\\sw+\\>" . font-lock-reference-face)
     ))
"Default expressions to highlight in Scheme modes.")


(defconst c-font-lock-keywords-1 nil
  "Subdued level highlighting for C modes.")

(defconst c-font-lock-keywords-2 nil
  "Medium level highlighting for C modes.")

(defconst c-font-lock-keywords-3 nil
  "Gaudy level highlighting for C modes.")

(defconst c++-font-lock-keywords-1 nil
  "Subdued level highlighting for C++ modes.")

(defconst c++-font-lock-keywords-2 nil
  "Medium level highlighting for C++ modes.")

(defconst c++-font-lock-keywords-3 nil
  "Gaudy level highlighting for C++ modes.")

(defun font-lock-match-c++-style-declaration-item-and-skip-to-next (limit)
  ;; Match, and move over, any declaration/definition item after point.
  ;; The expect syntax of an item is "word" or "word::word", possibly ending
  ;; with optional whitespace and a "(".  Everything following the item (but
  ;; belonging to it) is expected to by skip-able by `forward-sexp', and items
  ;; are expected to be separated with a ",".
  ;;
  ;; The regexp matches:        word::word (
  ;;                            ^^^^  ^^^^ ^
  ;; Match subexps are:           1     3  4
  ;;
  ;; So, the item is delimited by (match-beginning 1) and (match-end 1).
  ;; If (match-beginning 3) is non-nil, that part of the item follows a ":".
  ;; If (match-beginning 4) is non-nil, the item is followed by a "(".
  (if (looking-at "[ \t*&]*\\(\\sw+\\)\\(::\\(\\sw+\\)\\)?[ \t]*\\((\\)?")
      (save-match-data
        (condition-case nil
            (save-restriction
              ;; Restrict to the end of line, currently guaranteed to be LIMIT.
              (narrow-to-region (point-min) limit)
              (goto-char (match-end 1))
              ;; Move over any item value, etc., to the next item.
              (while (not (looking-at "[ \t]*\\(\\(,\\)\\|;\\|$\\)"))
                (goto-char (or (scan-sexps (point) 1) (point-max))))
              (goto-char (match-end 2)))
          (error t)))))

(let ((c-keywords
;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while")
       "break\\|continue\\|do\\|else\\|for\\|if\\|return\\|switch\\|while")
      (c-type-types
;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
;       "void" "volatile" "const")
       (concat "auto\\|c\\(har\\|onst\\)\\|double\\|e\\(num\\|xtern\\)\\|"
               "float\\|int\\|long\\|register\\|"
               "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|typedef\\|"
               "un\\(ion\\|signed\\)\\|vo\\(id\\|latile\\)"))   ; 6 ()s deep.
      (c++-keywords
;      ("break" "continue" "do" "else" "for" "if" "return" "switch" "while"
;       "asm" "catch" "delete" "new" "operator" "sizeof" "this" "throw" "try"
;       "protected" "private" "public")
       (concat "asm\\|break\\|c\\(atch\\|ontinue\\)\\|d\\(elete\\|o\\)\\|"
               "else\\|for\\|if\\|new\\|"
               "p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\|return\\|"
               "s\\(izeof\\|witch\\)\\|t\\(h\\(is\\|row\\)\\|ry\\)\\|while"))
      (c++-type-types
;      ("auto" "extern" "register" "static" "typedef" "struct" "union" "enum"
;       "signed" "unsigned" "short" "long" "int" "char" "float" "double"
;       "void" "volatile" "const" "class" "inline" "friend" "bool"
;       "virtual" "complex" "template")
       (concat "auto\\|bool\\|c\\(har\\|lass\\|o\\(mplex\\|nst\\)\\)\\|"
               "double\\|e\\(num\\|xtern\\)\\|f\\(loat\\|riend\\)\\|"
               "in\\(line\\|t\\)\\|long\\|register\\|"
               "s\\(hort\\|igned\\|t\\(atic\\|ruct\\)\\)\\|"
               "t\\(emplate\\|ypedef\\)\\|un\\(ion\\|signed\\)\\|"
               "v\\(irtual\\|o\\(id\\|latile\\)\\)"))           ; 11 ()s deep.
      )
 (setq c-font-lock-keywords-1
  (list
   ;;
   ;; These are all anchored at the beginning of line for speed.
   ;;
   ;; Fontify function name definitions (GNU style; without type on line).
   (list (concat "^\\(\\sw+\\)[ \t]*(") 1 'font-lock-function-name-face)
   ;;
   ;; Fontify filenames in #include <...> preprocessor directives as strings.
   '("^#[ \t]*include[ \t]+\\(<[^>\"\n]+>\\)" 1 font-lock-string-face)
   ;;
   ;; Fontify function macro names.
   '("^#[ \t]*define[ \t]+\\(\\sw+\\)(" 1 font-lock-function-name-face)
   ;;
   ;; Fontify symbol names in #elif or #if ... defined preprocessor directives.
   '("^#[ \t]*\\(elif\\|if\\)\\>"
     ("\\<\\(defined\\)\\>[ \t]*(?\\(\\sw+\\)?" nil nil
      (1 font-lock-reference-face) (2 font-lock-variable-name-face nil t)))
   ;;
   ;; Fontify otherwise as symbol names, and the preprocessor directive names.
   '("^#[ \t]*\\(\\sw+\\)\\>[ \t]*\\(\\sw+\\)?"
     (1 font-lock-reference-face) (2 font-lock-variable-name-face nil t))
   ))

 (setq c-font-lock-keywords-2
  (append c-font-lock-keywords-1
   (list
    ;;
    ;; Simple regexps for speed.
    ;;
    ;; Fontify all type specifiers.
    (cons (concat "\\<\\(" c-type-types "\\)\\>") 'font-lock-type-face)
    ;;
    ;; Fontify all builtin keywords (except case, default and goto; see below).
    (cons (concat "\\<\\(" c-keywords "\\)\\>") 'font-lock-keyword-face)
    ;;
    ;; Fontify case/goto keywords and targets, and case default/goto tags.
    '("\\<\\(case\\|goto\\)\\>[ \t]*\\(\\sw+\\)?"
      (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
    '("^[ \t]*\\(\\sw+\\)[ \t]*:" 1 font-lock-reference-face)
    )))

 (setq c-font-lock-keywords-3
  (append c-font-lock-keywords-2
   ;;
   ;; More complicated regexps for more complete highlighting for types.
   ;; We still have to fontify type specifiers individually, as C is so hairy.
   (list
    ;;
    ;; Fontify all storage classes and type specifiers, plus their items.
    (list (concat "\\<\\(" c-type-types "\\)\\>"
                  "\\([ \t*&]+\\sw+\\>\\)*")
          ;; Fontify each declaration item.
          '(font-lock-match-c++-style-declaration-item-and-skip-to-next
            ;; Start with point after all type specifiers.
            (goto-char (or (match-beginning 8) (match-end 1)))
            ;; Finish with point after first type specifier.
            (goto-char (match-end 1))
            ;; Fontify as a variable or function name.
            (1 (if (match-beginning 4)
                   font-lock-function-name-face
                 font-lock-variable-name-face))))
    ;;
    ;; Fontify structures, or typedef names, plus their items.
    '("\\(}\\)[ \t*]*\\sw"
      (font-lock-match-c++-style-declaration-item-and-skip-to-next
       (goto-char (match-end 1)) nil
       (1 (if (match-beginning 4)
              font-lock-function-name-face
            font-lock-variable-name-face))))
    ;;
    ;; Fontify anything at beginning of line as a declaration or definition.
    '("^\\(\\sw+\\)\\>\\([ \t*]+\\sw+\\>\\)*"
      (1 font-lock-type-face)
      (font-lock-match-c++-style-declaration-item-and-skip-to-next
       (goto-char (or (match-beginning 2) (match-end 1))) nil
       (1 (if (match-beginning 4)
              font-lock-function-name-face
            font-lock-variable-name-face))))
    )))

 (setq c++-font-lock-keywords-1
  (append
   ;;
   ;; The list `c-font-lock-keywords-1' less that for function names.
   (cdr c-font-lock-keywords-1)
   ;;
   ;; Fontify function name definitions, possibly incorporating class name.
   (list
    '("^\\(\\sw+\\)\\(::\\(\\sw+\\)\\)?[ \t]*("
      (1 (if (match-beginning 2)
             font-lock-type-face
           font-lock-function-name-face))
      (3 font-lock-function-name-face nil t))
    )))

 (setq c++-font-lock-keywords-2
  (append c++-font-lock-keywords-1
   (list
    ;;
    ;; The list `c-font-lock-keywords-2' for C++ plus operator overloading.
    (cons (concat "\\<\\(" c++-type-types "\\)\\>") 'font-lock-type-face)
    ;;
    ;; Fontify operator function name overloading.
    '("\\<\\(operator\\)\\>[ \t]*\\([[(><!=+-][])><=+-]?\\)?"
      (1 font-lock-keyword-face) (2 font-lock-function-name-face nil t))
    ;;
    ;; Fontify case/goto keywords and targets, and case default/goto tags.
    '("\\<\\(case\\|goto\\)\\>[ \t]*\\(\\sw+\\)?"
      (1 font-lock-keyword-face) (2 font-lock-reference-face nil t))
    '("^[ \t]*\\(\\sw+\\)[ \t]*:[^:]" 1 font-lock-reference-face)
    ;;
    ;; Fontify other builtin keywords.
    (cons (concat "\\<\\(" c++-keywords "\\)\\>") 'font-lock-keyword-face)
    )))

 (setq c++-font-lock-keywords-3
  (append c++-font-lock-keywords-2
   ;;
   ;; More complicated regexps for more complete highlighting for types.
   (list
    ;;
    ;; Fontify all storage classes and type specifiers, plus their items.
    (list (concat "\\<\\(" c++-type-types "\\)\\>"
                  "\\([ \t*&]+\\sw+\\>\\)*")
          ;; Fontify each declaration item.
          '(font-lock-match-c++-style-declaration-item-and-skip-to-next
            ;; Start with point after all type specifiers.
            (goto-char (or (match-beginning 13) (match-end 1)))
            ;; Finish with point after first type specifier.
            (goto-char (match-end 1))
            ;; Fontify as a variable or function name.
            (1 (cond ((match-beginning 2) font-lock-type-face)
                     ((match-beginning 4) font-lock-function-name-face)
                     (t font-lock-variable-name-face)))
            (3 (if (match-beginning 4)
                   font-lock-function-name-face
                 font-lock-variable-name-face) nil t)))
    ;;
    ;; Fontify structures, or typedef names, plus their items.
    '("\\(}\\)[ \t*]*\\sw"
      (font-lock-match-c++-style-declaration-item-and-skip-to-next
       (goto-char (match-end 1)) nil
       (1 (if (match-beginning 4)
              font-lock-function-name-face
            font-lock-variable-name-face))))
    ;;
    ;; Fontify anything at beginning of line as a declaration or definition.
    '("^\\(\\sw+\\)\\>\\([ \t*]+\\sw+\\>\\)*"
      (1 font-lock-type-face)
      (font-lock-match-c++-style-declaration-item-and-skip-to-next
       (goto-char (or (match-beginning 2) (match-end 1))) nil
       (1 (cond ((match-beginning 2) font-lock-type-face)
                ((match-beginning 4) font-lock-function-name-face)
                (t font-lock-variable-name-face)))
       (3 (if (match-beginning 4)
              font-lock-function-name-face
            font-lock-variable-name-face) nil t)))
    )))
 )

(defvar c-font-lock-keywords c-font-lock-keywords-1
  "Default expressions to highlight in C mode.")

(defvar c++-font-lock-keywords c++-font-lock-keywords-1
  "Default expressions to highlight in C++ mode.")


(defvar tex-font-lock-keywords
;  ;; Regexps updated with help from Ulrik Dickow <dickow@nbi.dk>.
;  '(("\\\\\\(begin\\|end\\|newcommand\\){\\([a-zA-Z0-9\\*]+\\)}"
;     2 font-lock-function-name-face)
;    ("\\\\\\(cite\\|label\\|pageref\\|ref\\){\\([^} \t\n]+\\)}"
;     2 font-lock-reference-face)
;    ;; It seems a bit dubious to use `bold' and `italic' faces since we might
;    ;; not be able to display those fonts.
;    ("{\\\\bf\\([^}]+\\)}" 1 'bold keep)
;    ("{\\\\\\(em\\|it\\|sl\\)\\([^}]+\\)}" 2 'italic keep)
;    ("\\\\\\([a-zA-Z@]+\\|.\\)" . font-lock-keyword-face)
;    ("^[ \t\n]*\\\\def[\\\\@]\\(\\w+\\)" 1 font-lock-function-name-face keep))
  ;; Rewritten and extended for LaTeX2e by Ulrik Dickow <dickow@nbi.dk>.
  '(("\\\\\\(begin\\|end\\|newcommand\\){\\([a-zA-Z0-9\\*]+\\)}"
     2 font-lock-function-name-face)
    ("\\\\\\(cite\\|label\\|pageref\\|ref\\){\\([^} \t\n]+\\)}"
     2 font-lock-reference-face)
    ("^[ \t]*\\\\def\\\\\\(\\(\\w\\|@\\)+\\)" 1 font-lock-function-name-face)
    "\\\\\\([a-zA-Z@]+\\|.\\)"
    ;; It seems a bit dubious to use `bold' and `italic' faces since we might
    ;; not be able to display those fonts.
    ;; LaTeX2e: \emph{This is emphasized}.
    ("\\\\emph{\\([^}]+\\)}" 1 'italic keep)
    ;; LaTeX2e: \textbf{This is bold}, \textit{...}, \textsl{...}
    ("\\\\text\\(\\(bf\\)\\|it\\|sl\\){\\([^}]+\\)}"
     3 (if (match-beginning 2) 'bold 'italic) keep)
    ;; Old-style bf/em/it/sl. Stop at `\\' and un-escaped `&', for good tables.
    ("\\\\\\(\\(bf\\)\\|em\\|it\\|sl\\)\\>\\(\\([^}&\\]\\|\\\\[^\\]\\)+\\)"
     3 (if (match-beginning 2) 'bold 'italic) keep))
  "Default expressions to highlight in TeX modes.")
\f
;; Install ourselves:

(unless (assq 'font-lock-mode minor-mode-alist)
  (setq minor-mode-alist (cons '(font-lock-mode " Font") minor-mode-alist)))

;; Provide ourselves:

(provide 'font-lock)

;;; font-lock.el ends here