Updated CC Mode to version 5.30.

[bpt/emacs.git] / lisp / progmodes / cc-langs.el

;;; cc-langs.el --- language specific settings for CC Mode

;; Copyright (C) 1985,1987,1992-2003 Free Software Foundation, Inc.

;; Authors:    1998- Martin Stjernholm
;;             1992-1999 Barry A. Warsaw
;;             1987 Dave Detlefs and Stewart Clamen
;;             1985 Richard M. Stallman
;; Maintainer: bug-cc-mode@gnu.org
;; Created:    22-Apr-1997 (split from cc-mode.el)
;; Version:    See cc-mode.el
;; Keywords:   c languages oop

;; 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:

;; HACKERS NOTE: There's heavy macro magic here.  If you need to make
;; changes in this or other files containing `c-lang-defconst' but
;; don't want to read through the longer discussion below then read
;; this:
;;
;; o  A change in a `c-lang-defconst' or `c-lang-defvar' will not take
;;    effect if the file containing the mode init function (typically
;;    cc-mode.el) is byte compiled.
;; o  To make changes show in font locking you need to reevaluate the
;;    `*-font-lock-keywords-*' constants, which normally is easiest to
;;    do with M-x eval-buffer in cc-fonts.el.
;; o  In either case it's necessary to reinitialize the mode to make
;;    the changes show in an existing buffer.

;;; Introduction to the language dependent variable system:
;;
;; This file contains all the language dependent variables, except
;; those specific for font locking which reside in cc-fonts.el.  As
;; far as possible, all the differences between the languages that CC
;; Mode supports are described with these variables only, so that the
;; code can be shared.
;;
;; The language constant system (see cc-defs.el) is used to specify
;; various language dependent info at a high level, such as lists of
;; keywords, and then from them generate - at compile time - the
;; various regexps and other low-level structures actually employed in
;; the code at runtime.
;;
;; This system is also designed to make it easy for developers of
;; derived modes to customize the source constants for new language
;; variants, without having to keep up with the exact regexps etc that
;; are used in each CC Mode version.  It's possible from an external
;; package to add a new language by inheriting an existing one, and
;; then change specific constants as necessary for the new language.
;; The old values for those constants (and the values of all the other
;; high-level constants) may be used to build the new ones, and those
;; new values will in turn be used by the low-level definitions here
;; to build the runtime constants appropriately for the new language
;; in the current version of CC Mode.
;;
;; Like elsewhere in CC Mode, the existence of a doc string signifies
;; that a language constant is part of the external API, and that it
;; therefore can be used with a high confidence that it will continue
;; to work with future versions of CC Mode.  Even so, it's not
;; unlikely that such constants will change meaning slightly as this
;; system is refined further; a certain degree of dependence on the CC
;; Mode version is unavoidable when hooking in at this level.  Also
;; note that there's still work to be done to actually use these
;; constants everywhere inside CC Mode; there are still hardcoded
;; values in many places in the code.
;;
;; Separate packages will also benefit from the compile time
;; evaluation; the byte compiled file(s) for them will contain the
;; compiled runtime constants ready for use by (the byte compiled) CC
;; Mode, and the source definitions in this file don't have to be
;; loaded then.  However, if a byte compiled package is loaded that
;; has been compiled with a different version of CC Mode than the one
;; currently loaded, then the compiled-in values will be discarded and
;; new ones will be built when the mode is initialized.  That will
;; automatically trig a load of the file(s) containing the source
;; definitions (i.e. this file and/or cc-fonts.el) if necessary.
;;
;; A small example of a derived mode is available at
;; <http://cc-mode.sourceforge.net/derived-mode-ex.el>.  It also
;; contains some useful hints for derived mode developers.

;;; Using language variables:
;;
;; The `c-lang-defvar' forms in this file comprise the language
;; variables that CC Mode uses.  It does not work to use
;; `c-lang-defvar' anywhere else (which isn't much of a limitation
;; since these variables sole purpose is to interface with the CC Mode
;; core functions).  The values in these `c-lang-defvar's are not
;; evaluated right away but instead collected to a single large `setq'
;; that can be inserted for a particular language with the
;; `c-init-language-vars' macro.

;; This file is only required at compile time, or when not running
;; from byte compiled files, or when the source definitions for the
;; language constants are requested.

;;; Code:

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

(cc-require 'cc-defs)
(cc-require 'cc-vars)

\f
;;; Setup for the `c-lang-defvar' system.

(eval-and-compile
  ;; These are used to collect the init forms from the subsequent
  ;; `c-lang-defvar'.  They are used to build the lambda in
  ;; `c-make-init-lang-vars-fun' below.
  (defconst c-lang-variable-inits (list nil))
  (defconst c-lang-variable-inits-tail c-lang-variable-inits))

(defmacro c-lang-defvar (var val &optional doc)
  "Declares the buffer local variable VAR to get the value VAL at mode
initialization, at which point VAL is evaluated.  More accurately, VAL
is evaluated and bound to VAR when the result from the macro
`c-init-language-vars' is evaluated.

`c-lang-const' is typically used in VAL to get the right value for the
language being initialized, and such calls will be macro expanded to
the evaluated constant value at compile time.

This macro does not do any hidden buffer changes."

  (when (and (not doc)
             (eq (car-safe val) 'c-lang-const)
             (eq (nth 1 val) var)
             (not (nth 2 val)))
    ;; Special case: If there's no docstring and the value is a
    ;; simple (c-lang-const foo) where foo is the same name as VAR
    ;; then take the docstring from the language constant foo.
    (setq doc (get (intern (symbol-name (nth 1 val)) c-lang-constants)
                   'variable-documentation)))
  (or (stringp doc)
      (setq doc nil))

  (let ((elem (assq var (cdr c-lang-variable-inits))))
    (if elem
        (setcdr elem (list val doc))
      (setcdr c-lang-variable-inits-tail (list (list var val doc)))
      (setq c-lang-variable-inits-tail (cdr c-lang-variable-inits-tail))))

  ;; Return the symbol, like the other def* forms.
  `',var)

(put 'c-lang-defvar 'lisp-indent-function 'defun)
(eval-after-load "edebug"
  '(def-edebug-spec c-lang-defvar
     (&define name def-form &optional stringp)))

\f
;;; Various mode specific values that aren't language related.

(c-lang-defconst c-mode-menu
  ;; The definition for the mode menu.  The menu title is prepended to
  ;; this before it's fed to `easy-menu-define'.
  t `(["Comment Out Region"     comment-region
       (c-fn-region-is-active-p)]
      ["Uncomment Region"       (comment-region (region-beginning)
                                                (region-end) '(4))
       (c-fn-region-is-active-p)]
      ["Indent Expression"      c-indent-exp
       (memq (char-after) '(?\( ?\[ ?\{))]
      ["Indent Line or Region"  c-indent-line-or-region t]
      ["Fill Comment Paragraph" c-fill-paragraph t]
      "----"
      ["Backward Statement"     c-beginning-of-statement t]
      ["Forward Statement"      c-end-of-statement t]
      ,@(when (c-lang-const c-opt-cpp-prefix)
          ;; Only applicable if there's a cpp preprocessor.
          `(["Up Conditional"         c-up-conditional t]
            ["Backward Conditional"   c-backward-conditional t]
            ["Forward Conditional"    c-forward-conditional t]
            "----"
            ["Macro Expand Region"    c-macro-expand
             (c-fn-region-is-active-p)]
            ["Backslashify"           c-backslash-region
             (c-fn-region-is-active-p)]))
      "----"
      ("Toggle..."
       ["Syntactic indentation" c-toggle-syntactic-indentation t]
       ["Auto newline"          c-toggle-auto-state t]
       ["Hungry delete"         c-toggle-hungry-state t])))

\f
;;; Syntax tables.

(defun c-populate-syntax-table (table)
  "Populate the given syntax table as necessary for a C-like language.
This includes setting ' and \" as string delimiters, and setting up
the comment syntax to handle both line style \"//\" and block style
\"/*\" \"*/\" comments."

  (modify-syntax-entry ?_  "_"     table)
  (modify-syntax-entry ?\\ "\\"    table)
  (modify-syntax-entry ?+  "."     table)
  (modify-syntax-entry ?-  "."     table)
  (modify-syntax-entry ?=  "."     table)
  (modify-syntax-entry ?%  "."     table)
  (modify-syntax-entry ?<  "."     table)
  (modify-syntax-entry ?>  "."     table)
  (modify-syntax-entry ?&  "."     table)
  (modify-syntax-entry ?|  "."     table)
  (modify-syntax-entry ?\' "\""    table)
  (modify-syntax-entry ?\240 "."   table)

  ;; Set up block and line oriented comments.  The new C
  ;; standard mandates both comment styles even in C, so since
  ;; all languages now require dual comments, we make this the
  ;; default.
  (cond
   ;; XEmacs
   ((memq '8-bit c-emacs-features)
    (modify-syntax-entry ?/  ". 1456" table)
    (modify-syntax-entry ?*  ". 23"   table))
   ;; Emacs
   ((memq '1-bit c-emacs-features)
    (modify-syntax-entry ?/  ". 124b" table)
    (modify-syntax-entry ?*  ". 23"   table))
   ;; incompatible
   (t (error "CC Mode is incompatible with this version of Emacs")))

  (modify-syntax-entry ?\n "> b"  table)
  ;; Give CR the same syntax as newline, for selective-display
  (modify-syntax-entry ?\^m "> b" table))

(c-lang-defconst c-make-mode-syntax-table
  "Functions that generates the mode specific syntax tables.
The syntax tables aren't stored directly since they're quite large."
  t `(lambda ()
       (let ((table (make-syntax-table)))
         (c-populate-syntax-table table)
         ;; Mode specific syntaxes.
         ,(cond ((c-major-mode-is 'objc-mode)
                 `(modify-syntax-entry ?@ "_" table))
                ((c-major-mode-is 'pike-mode)
                 `(modify-syntax-entry ?@ "." table)))
         table)))

(c-lang-defconst c-mode-syntax-table
  ;; The syntax tables in evaluated form.  Only used temporarily when
  ;; the constants in this file are evaluated.
  t (funcall (c-lang-const c-make-mode-syntax-table)))

(c-lang-defconst make-c++-template-syntax-table
  ;; A variant of `c++-mode-syntax-table' that defines `<' and `>' as
  ;; parenthesis characters.  Used temporarily when template argument
  ;; lists are parsed.  Note that this encourages incorrect parsing of
  ;; templates since they might contain normal operators that uses the
  ;; '<' and '>' characters.  Therefore this syntax table might go
  ;; away when CC Mode handles templates correctly everywhere.
  t   nil
  c++ `(lambda ()
         (let ((table (funcall ,(c-lang-const c-make-mode-syntax-table))))
           (modify-syntax-entry ?< "(>" table)
           (modify-syntax-entry ?> ")<" table)
           table)))
(c-lang-defvar c++-template-syntax-table
  (and (c-lang-const make-c++-template-syntax-table)
       (funcall (c-lang-const make-c++-template-syntax-table))))

(c-lang-defconst c-identifier-syntax-modifications
  "A list that describes the modifications that should be done to the
mode syntax table to get a syntax table that matches all identifiers
and keywords as words.

The list is just like the one used in `font-lock-defaults': Each
element is a cons where the car is the character to modify and the cdr
the new syntax, as accepted by `modify-syntax-entry'."
  ;; The $ character is not allowed in most languages (one exception
  ;; is Java which allows it for legacy reasons) but we still classify
  ;; it as an indentifier character since it's often used in various
  ;; machine generated identifiers.
  t    '((?_ . "w") (?$ . "w"))
  objc (append '((?@ . "w"))
               (c-lang-const c-identifier-syntax-modifications))
  awk  '((?_ . "w")))
(c-lang-defvar c-identifier-syntax-modifications
  (c-lang-const c-identifier-syntax-modifications))

(c-lang-defvar c-identifier-syntax-table
  (let ((table (copy-syntax-table (c-mode-var "mode-syntax-table")))
        (mods c-identifier-syntax-modifications)
        mod)
    (while mods
      (setq mod (car mods)
            mods (cdr mods))
      (modify-syntax-entry (car mod) (cdr mod) table))
    table)
  "Syntax table built on the mode syntax table but additionally
classifies symbol constituents like '_' and '$' as word constituents,
so that all identifiers are recognized as words.")

\f
;;; Lexer-level syntax (identifiers, tokens etc).

(c-lang-defconst c-symbol-start
  "Regexp that matches the start of a symbol, i.e. any identifier or
keyword.  It's unspecified how far it matches.  Does not contain a \\|
operator at the top level."
  t    (concat "[" c-alpha "_]")
  pike (concat "[" c-alpha "_`]"))
(c-lang-defvar c-symbol-start (c-lang-const c-symbol-start))

(c-lang-defconst c-symbol-chars
  "Set of characters that can be part of a symbol.
This is on the form that fits inside [ ] in a regexp."
  ;; Pike note: With the backquote identifiers this would include most
  ;; operator chars too, but they are handled with other means instead.
  t    (concat c-alnum "_$")
  objc (concat c-alnum "_$@"))

(c-lang-defconst c-symbol-key
  "Regexp matching identifiers and keywords.  Assumed to match if
`c-symbol-start' matches on the same position."
  t    (concat (c-lang-const c-symbol-start)
               "[" (c-lang-const c-symbol-chars) "]*")
  pike (concat
        ;; Use the value from C here since the operator backquote is
        ;; covered by the other alternative.
        (c-lang-const c-symbol-key c)
        "\\|"
        (c-make-keywords-re nil
          (c-lang-const c-overloadable-operators))))
(c-lang-defvar c-symbol-key (c-lang-const c-symbol-key))

(c-lang-defconst c-symbol-key-depth
  ;; Number of regexp grouping parens in `c-symbol-key'.
  t (c-regexp-opt-depth (c-lang-const c-symbol-key)))

(c-lang-defconst c-nonsymbol-chars
  "This is the set of chars that can't be part of a symbol, i.e. the
negation of `c-symbol-chars'."
  t (concat "^" (c-lang-const c-symbol-chars)))
(c-lang-defvar c-nonsymbol-chars (c-lang-const c-nonsymbol-chars))

(c-lang-defconst c-nonsymbol-key
  "Regexp that matches any character that can't be part of a symbol.
It's usually appended to other regexps to avoid matching a prefix.
It's assumed to not contain any submatchers."
  ;; The same thing regarding Unicode identifiers applies here as to
  ;; `c-symbol-key'.
  t (concat "[" (c-lang-const c-nonsymbol-chars) "]"))

(c-lang-defconst c-opt-identifier-concat-key
  "Regexp matching the operators that join symbols to fully qualified
identifiers, or nil in languages that don't have such things.  Does
not contain a \\| operator at the top level."
  t    nil
  c++  "::"
  java "\\."
  idl  "::"
  pike "\\(::\\|\\.\\)")
(c-lang-defvar c-opt-identifier-concat-key
  (c-lang-const c-opt-identifier-concat-key)
  'dont-doc)

(c-lang-defconst c-opt-after-id-concat-key
  "Regexp that must match the token after `c-opt-identifier-concat-key'
for it to be considered an identifier concatenation operator (which
e.g. causes the preceding identifier to be fontified as a reference).
Assumed to be a string if `c-opt-identifier-concat-key' is."
  t    (if (c-lang-const c-opt-identifier-concat-key)
           (c-lang-const c-symbol-start))
  c++  (concat (c-lang-const c-symbol-start)
               "\\|[~*]")
  java (concat (c-lang-const c-symbol-start)
               "\\|\\*"))

(c-lang-defconst c-identifier-start
  "Regexp that matches the start of an \(optionally qualified)
identifier.  It should also match all keywords.  It's unspecified how
far it matches."
  t    (concat (c-lang-const c-symbol-start)
               (if (c-lang-const c-opt-identifier-concat-key)
                   (concat "\\|" (c-lang-const c-opt-identifier-concat-key))
                 ""))
  c++  (concat (c-lang-const c-identifier-start)
               "\\|"
               "[~*][ \t\n\r\f\v]*" (c-lang-const c-symbol-start))
  ;; Java does not allow a leading qualifier operator.
  java (c-lang-const c-symbol-start))
(c-lang-defvar c-identifier-start (c-lang-const c-identifier-start))

(c-lang-defconst c-identifier-key
  "Regexp matching a fully qualified identifier, like \"A::B::c\" in
C++.  It does not recognize the full range of syntactic whitespace
between the tokens; `c-forward-name' has to be used for that."
  t    (c-lang-const c-symbol-key)      ; Default to `c-symbol-key'.
  ;; C++ allows a leading qualifier operator and a `~' before the last
  ;; symbol.  This regexp is more complex than strictly necessary to
  ;; ensure that it can be matched with a minimum of backtracking.
  c++  (concat
        "\\(" (c-lang-const c-opt-identifier-concat-key) "[ \t\n\r\f\v]*\\)?"
        (concat
         "\\("
         ;; The submatch below is depth of `c-opt-identifier-concat-key' + 3.
         "\\(" (c-lang-const c-symbol-key) "\\)"
         (concat "\\("
                 "[ \t\n\r\f\v]*"
                 (c-lang-const c-opt-identifier-concat-key)
                 "[ \t\n\r\f\v]*"
                 ;; The submatch below is: `c-symbol-key-depth' +
                 ;; 2 * depth of `c-opt-identifier-concat-key' + 5.
                 "\\(" (c-lang-const c-symbol-key) "\\)"
                 "\\)*")
         (concat "\\("
                 "[ \t\n\r\f\v]*"
                 (c-lang-const c-opt-identifier-concat-key)
                 "[ \t\n\r\f\v]*"
                 "[~*]"
                 "[ \t\n\r\f\v]*"
                 ;; The submatch below is: 2 * `c-symbol-key-depth' +
                 ;; 3 * depth of `c-opt-identifier-concat-key' + 7.
                 "\\(" (c-lang-const c-symbol-key) "\\)"
                 "\\)?")
         "\\|"
         "~[ \t\n\r\f\v]*"
         ;; The submatch below is: 3 * `c-symbol-key-depth' +
         ;; 3 * depth of `c-opt-identifier-concat-key' + 8.
         "\\(" (c-lang-const c-symbol-key) "\\)"
         "\\)"))
  ;; IDL and Pike allows a leading qualifier operator.
  (idl pike) (concat
              "\\("
              (c-lang-const c-opt-identifier-concat-key)
              "[ \t\n\r\f\v]*"
              "\\)?"
              ;; The submatch below is depth of
              ;; `c-opt-identifier-concat-key' + 2.
              "\\(" (c-lang-const c-symbol-key) "\\)"
              (concat "\\("
                      "[ \t\n\r\f\v]*"
                      (c-lang-const c-opt-identifier-concat-key)
                      "[ \t\n\r\f\v]*"
                      ;; The submatch below is: `c-symbol-key-depth' +
                      ;; 2 * depth of `c-opt-identifier-concat-key' + 4.
                      "\\(" (c-lang-const c-symbol-key) "\\)"
                      "\\)*"))
  ;; Java does not allow a leading qualifier operator.  If it ends
  ;; with ".*" (used in import declarations) we also consider that as
  ;; part of the name.  ("*" is actually recognized in any position
  ;; except the first by this regexp, but we don't bother.)
  java (concat "\\(" (c-lang-const c-symbol-key) "\\)" ; 1
               (concat "\\("
                       "[ \t\n\r\f\v]*"
                       (c-lang-const c-opt-identifier-concat-key)
                       "[ \t\n\r\f\v]*"
                       (concat "\\("
                               ;; The submatch below is `c-symbol-key-depth' +
                               ;; depth of `c-opt-identifier-concat-key' + 4.
                               "\\(" (c-lang-const c-symbol-key) "\\)"
                               "\\|\\*\\)")
                       "\\)*")))
(c-lang-defvar c-identifier-key (c-lang-const c-identifier-key))

(c-lang-defconst c-identifier-last-sym-match
  "Used to identify the submatch in `c-identifier-key' that surrounds
the last symbol in the qualified identifier.  It's a list of submatch
numbers, of which the first that has a match is taken.  It's assumed
that at least one does when the regexp has matched."
  t    '(0)
  c++  (list (+ (* 3 (c-lang-const c-symbol-key-depth))
                (* 3 (c-regexp-opt-depth
                      (c-lang-const c-opt-identifier-concat-key)))
                8)
             (+ (* 2 (c-lang-const c-symbol-key-depth))
                (* 3 (c-regexp-opt-depth
                      (c-lang-const c-opt-identifier-concat-key)))
                7)
             (+ (c-lang-const c-symbol-key-depth)
                (* 2 (c-regexp-opt-depth
                      (c-lang-const c-opt-identifier-concat-key)))
                5)
             (+ (c-regexp-opt-depth
                 (c-lang-const c-opt-identifier-concat-key))
                3))
  (idl pike) (list (+ (c-lang-const c-symbol-key-depth)
                      (* 2 (c-regexp-opt-depth
                            (c-lang-const c-opt-identifier-concat-key)))
                      4)
                   (+ (c-regexp-opt-depth
                       (c-lang-const c-opt-identifier-concat-key))
                      2))
  java (list (+ (c-lang-const c-symbol-key-depth)
                (c-regexp-opt-depth
                 (c-lang-const c-opt-identifier-concat-key))
                4)
             1))
(c-lang-defvar c-identifier-last-sym-match
  (c-lang-const c-identifier-last-sym-match)
  'dont-doc)

(c-lang-defconst c-opt-cpp-prefix
  "Regexp matching the prefix of a cpp directive in the languages that
normally use that macro preprocessor.  Tested at bol or at boi.
Assumed to not contain any submatches or \\| operators."
  t "\\s *#\\s *"
  (java awk) nil)
(c-lang-defvar c-opt-cpp-prefix (c-lang-const c-opt-cpp-prefix))

(c-lang-defconst c-opt-cpp-start
  "Regexp matching the prefix of a cpp directive including the directive
name, or nil in languages without preprocessor support.  The first
submatch surrounds the directive name."
  t    (if (c-lang-const c-opt-cpp-prefix)
           (concat (c-lang-const c-opt-cpp-prefix)
                   "\\([" c-alnum "]+\\)"))
  ;; Pike, being a scripting language, recognizes hash-bangs too.
  pike (concat (c-lang-const c-opt-cpp-prefix)
               "\\([" c-alnum "]+\\|!\\)"))
(c-lang-defvar c-opt-cpp-start (c-lang-const c-opt-cpp-start))

(c-lang-defconst c-cpp-defined-fns
  ;; Name of functions in cpp expressions that take an identifier as
  ;; the argument.
  t    (if (c-lang-const c-opt-cpp-prefix)
           '("defined"))
  pike '("defined" "efun" "constant"))

(c-lang-defconst c-operators
  "List describing all operators, along with their precedence and
associativity.  The order in the list corresponds to the precedence of
the operators: The operators in each element is a group with the same
precedence, and the group has higher precedence than the groups in all
following elements.  The car of each element describes the type of of
the operator group, and the cdr is a list of the operator tokens in
it.  The operator group types are:

'prefix         Unary prefix operators.
'postfix        Unary postfix operators.
'left-assoc     Binary left associative operators (i.e. a+b+c means (a+b)+c).
'right-assoc    Binary right associative operators (i.e. a=b=c means a=(b=c)).
'right-assoc-sequence
                Right associative operator that constitutes of a
                sequence of tokens that separate expressions.  All the
                tokens in the group are in this case taken as
                describing the sequence in one such operator, and the
                order between them is therefore significant.

Operators containing a character with paren syntax are taken to match
with a corresponding open/close paren somewhere else.  A postfix
operator with close paren syntax is taken to end a postfix expression
started somewhere earlier, rather than start a new one at point.  Vice
versa for prefix operators with open paren syntax.

Note that operators like \".\" and \"->\" which in language references
often are described as postfix operators are considered binary here,
since CC Mode treats every identifier as an expression."

  ;; There's currently no code in CC Mode that exploit all the info
  ;; in this variable; precedence, associativity etc are present as a
  ;; preparation for future work.

  t `(;; Preprocessor.
      ,@(when (c-lang-const c-opt-cpp-prefix)
          `((prefix "#"
                    ,@(when (c-major-mode-is '(c-mode c++-mode))
                        '("%:" "??=")))
            (left-assoc "##"
                        ,@(when (c-major-mode-is '(c-mode c++-mode))
                            '("%:%:" "??=??=")))))

      ;; Primary.  Info duplicated in `c-opt-identifier-concat-key'
      ;; and `c-identifier-key'.
      ,@(cond ((c-major-mode-is 'c++-mode)
               `((postfix-if-paren "<" ">") ; Templates.
                 (prefix "~" "??-" "compl")
                 (right-assoc "::")
                 (prefix "::")))
              ((c-major-mode-is 'pike-mode)
               `((left-assoc "::")
                 (prefix "::" "global" "predef")))
              ((c-major-mode-is 'java-mode)
               `(;; Not necessary since it's also in the postfix group below.
                 ;;(left-assoc ".")
                 (prefix "super"))))

      ;; Postfix.
      ,@(when (c-major-mode-is 'c++-mode)
          ;; The following need special treatment.
          `((prefix "dynamic_cast" "static_cast"
                    "reinterpret_cast" "const_cast" "typeid")))
      (left-assoc "."
                  ,@(unless (c-major-mode-is 'java-mode)
                      '("->")))
      (postfix "++" "--" "[" "]" "(" ")"
               ,@(when (c-major-mode-is '(c-mode c++-mode))
                   '("<:" ":>" "??(" "??)")))

      ;; Unary.
      (prefix "++" "--" "+" "-" "!" "~"
              ,@(when (c-major-mode-is 'c++-mode) '("not" "compl"))
              ,@(when (c-major-mode-is '(c-mode c++-mode))
                  '("*" "&" "sizeof" "??-"))
              ,@(when (c-major-mode-is 'objc-mode)
                  '("@selector" "@protocol" "@encode"))
              ;; The following need special treatment.
              ,@(cond ((c-major-mode-is 'c++-mode)
                       '("new" "delete"))
                      ((c-major-mode-is 'java-mode)
                       '("new"))
                      ((c-major-mode-is 'pike-mode)
                       '("class" "lambda" "catch" "throw" "gauge")))
              "(" ")"                   ; Cast.
              ,@(when (c-major-mode-is 'pike-mode)
                  '("[" "]")))          ; Type cast.

      ;; Member selection.
      ,@(when (c-major-mode-is 'c++-mode)
          `((left-assoc ".*" "->*")))

      ;; Multiplicative.
      (left-assoc "*" "/" "%")

      ;; Additive.
      (left-assoc "+" "-")

      ;; Shift.
      (left-assoc "<<" ">>"
                  ,@(when (c-major-mode-is 'java-mode)
                      '(">>>")))

      ;; Relational.
      (left-assoc "<" ">" "<=" ">="
                  ,@(when (c-major-mode-is 'java-mode)
                      '("instanceof")))

      ;; Equality.
      (left-assoc "==" "!="
                  ,@(when (c-major-mode-is 'c++-mode) '("not_eq")))

      ;; Bitwise and.
      (left-assoc "&"
                  ,@(when (c-major-mode-is 'c++-mode) '("bitand")))

      ;; Bitwise exclusive or.
      (left-assoc "^"
                  ,@(when (c-major-mode-is '(c-mode c++-mode))
                      '("??'"))
                  ,@(when (c-major-mode-is 'c++-mode) '("xor")))

      ;; Bitwise or.
      (left-assoc "|"
                  ,@(when (c-major-mode-is '(c-mode c++-mode))
                      '("??!"))
                  ,@(when (c-major-mode-is 'c++-mode) '("bitor")))

      ;; Logical and.
      (left-assoc "&&"
                  ,@(when (c-major-mode-is 'c++-mode) '("and")))

      ;; Logical or.
      (left-assoc "||"
                  ,@(when (c-major-mode-is '(c-mode c++-mode))
                      '("??!??!"))
                  ,@(when (c-major-mode-is 'c++-mode) '("or")))

      ;; Conditional.
      (right-assoc-sequence "?" ":")

      ;; Assignment.
      (right-assoc "=" "*=" "/=" "%=" "+=" "-=" ">>=" "<<=" "&=" "^=" "|="
                   ,@(when (c-major-mode-is 'java-mode)
                       '(">>>="))
                   ,@(when (c-major-mode-is 'c++-mode)
                       '("and_eq" "or_eq" "xor_eq")))

      ;; Exception.
      ,@(when (c-major-mode-is 'c++-mode)
          '((prefix "throw")))

      ;; Sequence.
      (left-assoc ","))

  ;; IDL got its own definition since it has a much smaller operator
  ;; set than the other languages.
  idl `(;; Preprocessor.
        (prefix "#")
        (left-assoc "##")
        ;; Primary.  Info duplicated in `c-opt-identifier-concat-key'
        ;; and `c-identifier-key'.
        (left-assoc "::")
        (prefix "::")
        ;; Unary.
        (prefix  "+" "-" "~")
        ;; Multiplicative.
        (left-assoc "*" "/" "%")
        ;; Additive.
        (left-assoc "+" "-")
        ;; Shift.
        (left-assoc "<<" ">>")
        ;; And.
        (left-assoc "&")
        ;; Xor.
        (left-assoc "^")
        ;; Or.
        (left-assoc "|")))

(c-lang-defconst c-operator-list
  ;; The operators as a flat list (without duplicates).
  t (delete-duplicates (mapcan (lambda (elem) (append (cdr elem) nil))
                               (c-lang-const c-operators))
                       :test 'string-equal))

(c-lang-defconst c-overloadable-operators
  "List of the operators that are overloadable, in their \"identifier form\"."
  t    nil
  ;; The preceding "operator" keyword is treated separately in C++.
  c++  '("new" "delete" ;; Can be followed by "[]" but we ignore that.
         "+" "-" "*" "/" "%"
         "^" "??'" "xor" "&" "bitand" "|" "??!" "bitor" "~" "??-" "compl"
         "!" "=" "<" ">" "+=" "-=" "*=" "/=" "%=" "^="
         "??'=" "xor_eq" "&=" "and_eq" "|=" "??!=" "or_eq"
         "<<" ">>" ">>=" "<<=" "==" "!=" "not_eq" "<=" ">="
         "&&" "and" "||" "??!??!" "or" "++" "--" "," "->*" "->"
         "()" "[]" "<::>" "??(??)")
  ;; These work like identifiers in Pike.
  pike '("`+" "`-" "`&" "`|" "`^" "`<<" "`>>" "`*" "`/" "`%" "`~"
         "`==" "`<" "`>" "`!" "`[]" "`[]=" "`->" "`->=" "`()" "``+"
         "``-" "``&" "``|" "``^" "``<<" "``>>" "``*" "``/" "``%"
         "`+="))

(c-lang-defconst c-overloadable-operators-regexp
  ;; Regexp tested after an "operator" token in C++.
  t   nil
  c++ (c-make-keywords-re nil (c-lang-const c-overloadable-operators)))
(c-lang-defvar c-overloadable-operators-regexp
  (c-lang-const c-overloadable-operators-regexp))

(c-lang-defconst c-other-op-syntax-tokens
  "List of the tokens made up of characters in the punctuation or
parenthesis syntax classes that have uses other than as expression
operators."
  t '("{" "}" "(" ")" "[" "]" ";" ":" "," "=" "/*" "*/" "//")
  (c c++ pike) (append '("#" "##"       ; Used by cpp.
                         "::" "...")
                       (c-lang-const c-other-op-syntax-tokens))
  (c c++) (append '("<%" "%>" "<:" ":>" "%:" "%:%:" "*")
                  (c-lang-const c-other-op-syntax-tokens))
  c++  (append '("&") (c-lang-const c-other-op-syntax-tokens))
  objc (append '("#" "##"               ; Used by cpp.
                 "+" "-") (c-lang-const c-other-op-syntax-tokens))
  idl  (append '("#" "##")              ; Used by cpp.
               (c-lang-const c-other-op-syntax-tokens))
  pike (append '("..")
               (c-lang-const c-other-op-syntax-tokens)
               (c-lang-const c-overloadable-operators))
  awk '("{" "}" "(" ")" "[" "]" ";" "," "=" "/"))

(c-lang-defconst c-nonsymbol-token-regexp
  ;; Regexp matching all tokens in the punctuation and parenthesis
  ;; syntax classes.  Note that this also matches ".", which can start
  ;; a float.
  t (c-make-keywords-re nil
      (c-with-syntax-table (c-lang-const c-mode-syntax-table)
        (mapcan (lambda (op)
                  (if (string-match "\\`\\(\\s.\\|\\s\(\\|\\s\)\\)+\\'" op)
                      (list op)))
                (append (c-lang-const c-other-op-syntax-tokens)
                        (c-lang-const c-operator-list))))))
(c-lang-defvar c-nonsymbol-token-regexp
  (c-lang-const c-nonsymbol-token-regexp))

(c-lang-defconst c-<-op-cont-regexp
  ;; Regexp matching the second and subsequent characters of all
  ;; multicharacter tokens that begin with "<".
  t (c-make-keywords-re nil
      (mapcan (lambda (op)
                (if (string-match "\\`<." op)
                    (list (substring op 1))))
              (append (c-lang-const c-other-op-syntax-tokens)
                      (c-lang-const c-operator-list)))))
(c-lang-defvar c-<-op-cont-regexp (c-lang-const c-<-op-cont-regexp))

(c-lang-defconst c->-op-cont-regexp
  ;; Regexp matching the second and subsequent characters of all
  ;; multicharacter tokens that begin with ">".
  t (c-make-keywords-re nil
      (mapcan (lambda (op)
                (if (string-match "\\`>." op)
                    (list (substring op 1))))
              (append (c-lang-const c-other-op-syntax-tokens)
                      (c-lang-const c-operator-list)))))
(c-lang-defvar c->-op-cont-regexp (c-lang-const c->-op-cont-regexp))

(c-lang-defconst c-stmt-delim-chars
  ;; The characters that should be considered to bound statements.  To
  ;; optimize `c-crosses-statement-barrier-p' somewhat, it's assumed to
  ;; begin with "^" to negate the set.  If ? : operators should be
  ;; detected then the string must end with "?:".
  t    "^;{}?:"
  awk  "^;{}\n\r?:") ; The newline chars gets special treatment.
(c-lang-defvar c-stmt-delim-chars (c-lang-const c-stmt-delim-chars))

(c-lang-defconst c-stmt-delim-chars-with-comma
  ;; Variant of `c-stmt-delim-chars' that additionally contains ','.
  t    "^;,{}?:"
  awk  "^;,{}\n\r?:") ; The newline chars gets special treatment.
(c-lang-defvar c-stmt-delim-chars-with-comma
  (c-lang-const c-stmt-delim-chars-with-comma))

\f
;;; Syntactic whitespace.

(c-lang-defconst c-comment-start-regexp
  ;; Regexp to match the start of any type of comment.
  ;;
  ;; TODO: Ought to use `c-comment-prefix-regexp' with some
  ;; modifications instead of this.
  t    "/[/*]"
  awk  "#")
(c-lang-defvar c-comment-start-regexp (c-lang-const c-comment-start-regexp))

(c-lang-defconst c-literal-start-regexp
  ;; Regexp to match the start of comments and string literals.
  t (concat (c-lang-const c-comment-start-regexp)
            "\\|"
            (if (memq 'gen-string-delim c-emacs-features)
                "\"|"
              "\"")))
(c-lang-defvar c-literal-start-regexp (c-lang-const c-literal-start-regexp))

(c-lang-defconst c-doc-comment-start-regexp
  "Regexp to match the start of documentation comments."
  t    "\\<\\>"
  ;; From font-lock.el: `doxygen' uses /*! while others use /**.
  (c c++ objc) "/\\*[*!]"
  java "/\\*\\*"
  pike "/[/*]!")
(c-lang-defvar c-doc-comment-start-regexp
  (c-lang-const c-doc-comment-start-regexp))

(c-lang-defconst comment-start
  "String that starts comments inserted with M-; etc.
`comment-start' is initialized from this."
  t    "// "
  c    "/* "
  awk  "# ")
(c-lang-defvar comment-start (c-lang-const comment-start)
  'dont-doc)

(c-lang-defconst comment-end
  "String that ends comments inserted with M-; etc.
`comment-end' is initialized from this."
  t    ""
  c    " */")
(c-lang-defvar comment-end (c-lang-const comment-end)
  'dont-doc)

(c-lang-defconst comment-start-skip
  "Regexp to match the start of a comment plus everything up to its body.
`comment-start-skip' is initialized from this."
  t    "/\\*+ *\\|//+ *"
  awk  "#+ *")
(c-lang-defvar comment-start-skip (c-lang-const comment-start-skip)
  'dont-doc)

(c-lang-defconst syntactic-ws-start
  "Regexp matching any sequence that can start syntactic whitespace.
The only uncertain case is '#' when there are cpp directives."
  t     "[ \n\t\r\v\f#]\\|/[/*]\\|\\\\[\n\r]"
  awk   "[ \n\t\r\v\f#]\\|\\\\[\n\r]")
(c-lang-defvar c-syntactic-ws-start (c-lang-const syntactic-ws-start)
  'dont-doc)

(c-lang-defconst syntactic-ws-end
  "Regexp matching any single character that might end syntactic whitespace."
  t     "[ \n\t\r\v\f/]"
  awk   "[ \n\t\r\v\f]")
(c-lang-defvar c-syntactic-ws-end (c-lang-const syntactic-ws-end)
  'dont-doc)

(c-lang-defconst c-nonwhite-syntactic-ws
  ;; Regexp matching a piece of syntactic whitespace that isn't a
  ;; sequence of simple whitespace characters.  As opposed to
  ;; `c-(forward|backward)-syntactic-ws', this doesn't regard cpp
  ;; directives as syntactic whitespace.
  t (concat "/" (concat
                 "\\("
                 "/[^\n\r]*[\n\r]"      ; Line comment.
                 "\\|"
                 ;; Block comment. We intentionally don't allow line
                 ;; breaks in them to avoid going very far and risk
                 ;; running out of regexp stack; this regexp is
                 ;; intended to handle only short comments that
                 ;; might be put in the middle of limited constructs
                 ;; like declarations.
                 "\\*\\([^*\n\r]\\|\\*[^/\n\r]\\)*\\*/"
                 "\\)")
            "\\|"
            "\\\\[\n\r]")               ; Line continuations.
  awk ("#.*[\n\r]\\|\\\\[\n\r]"))

(c-lang-defconst c-syntactic-ws
  ;; Regexp matching syntactic whitespace, including possibly the
  ;; empty string.  As opposed to `c-(forward|backward)-syntactic-ws',
  ;; this doesn't regard cpp directives as syntactic whitespace.  Does
  ;; not contain a \| operator at the top level.
  t (concat "[ \t\n\r\f\v]*\\("
            "\\(" (c-lang-const c-nonwhite-syntactic-ws) "\\)"
            "[ \t\n\r\f\v]*\\)*"))

(c-lang-defconst c-syntactic-ws-depth
  ;; Number of regexp grouping parens in `c-syntactic-ws'.
  t (c-regexp-opt-depth (c-lang-const c-syntactic-ws)))

(c-lang-defconst c-nonempty-syntactic-ws
  ;; Regexp matching syntactic whitespace, which is at least one
  ;; character long.  As opposed to `c-(forward|backward)-syntactic-ws',
  ;; this doesn't regard cpp directives as syntactic whitespace.  Does
  ;; not contain a \| operator at the top level.
  t (concat "\\([ \t\n\r\f\v]\\|"
            (c-lang-const c-nonwhite-syntactic-ws)
            "\\)+"))

(c-lang-defconst c-nonempty-syntactic-ws-depth
  ;; Number of regexp grouping parens in `c-nonempty-syntactic-ws'.
  t (c-regexp-opt-depth (c-lang-const c-nonempty-syntactic-ws)))

(c-lang-defconst c-single-line-syntactic-ws
  ;; Regexp matching syntactic whitespace without any line breaks.  As
  ;; opposed to `c-(forward|backward)-syntactic-ws', this doesn't
  ;; regard cpp directives as syntactic whitespace.  Does not contain
  ;; a \| operator at the top level.
  t (concat "[ \t]*\\("
            "/\\*\\([^*\n\r]\\|\\*[^/\n\r]\\)*\\*/" ; Block comment
            "[ \t]*\\)*")
  awk ("[ \t]*\\(#.*$\\)?"))

(c-lang-defconst c-single-line-syntactic-ws-depth
  ;; Number of regexp grouping parens in `c-single-line-syntactic-ws'.
  t (c-regexp-opt-depth (c-lang-const c-single-line-syntactic-ws)))

(c-lang-defvar c-syntactic-eol
  ;; Regexp that matches when there is no syntactically significant
  ;; text before eol.  Macros are regarded as syntactically
  ;; significant text here.
  (concat (concat
           ;; Match horizontal whitespace and block comments that
           ;; don't contain newlines.
           "\\(\\s \\|"
           (concat "/\\*"
                   "\\([^*\n\r]\\|\\*[^/\n\r]\\)*"
                   "\\*/")
           "\\)*")
          (concat
           ;; Match eol (possibly inside a block comment or preceded
           ;; by a line continuation backslash), or the beginning of a
           ;; line comment.  Note: This has to be modified for awk
           ;; where line comments start with '#'.
           "\\("
           (concat "\\("
                   "/\\*\\([^*\n\r]\\|\\*[^/\n\r]\\)*"
                   "\\|"
                   "\\\\"
                   "\\)?"
                   "$")
           "\\|//\\)")))

\f
;;; In-comment text handling.

(c-lang-defconst c-paragraph-start
  "Regexp to append to `paragraph-start'."
  t    "$"
  java "\\(@[a-zA-Z]+\\>\\|$\\)"        ; For Javadoc.
  pike "\\(@[a-zA-Z_-]+\\>\\([^{]\\|$\\)\\|$\\)") ; For Pike refdoc.
(c-lang-defvar c-paragraph-start (c-lang-const c-paragraph-start))

(c-lang-defconst c-paragraph-separate
  "Regexp to append to `paragraph-separate'."
  t    "$"
  pike (c-lang-const c-paragraph-start))
(c-lang-defvar c-paragraph-separate (c-lang-const c-paragraph-separate))

\f
;;; Keyword lists.

;; Note: All and only all language constants containing keyword lists
;; should end with "-kwds"; they're automatically collected into the
;; `c-kwds-lang-consts' list below and used to build `c-keywords' etc.

(c-lang-defconst c-primitive-type-kwds
  "Primitive type keywords.  As opposed to the other keyword lists, the
keywords listed here are fontified with the type face instead of the
keyword face.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled.

Do not try to modify this list for end user customizations; the
`*-font-lock-extra-types' variable, where `*' is the mode prefix, is
the appropriate place for that."
  t    '("char" "double" "float" "int" "long" "short" "signed"
         "unsigned" "void")
  c    (append
        '("_Bool" "_Complex" "_Imaginary") ; Conditionally defined in C99.
        (c-lang-const c-primitive-type-kwds))
  c++  (append
        '("bool" "wchar_t")
        (c-lang-const c-primitive-type-kwds))
  ;; Objective-C extends C, but probably not the new stuff in C99.
  objc (append
        '("id" "Class" "SEL" "IMP" "BOOL")
        (c-lang-const c-primitive-type-kwds))
  java '("boolean" "byte" "char" "double" "float" "int" "long" "short" "void")
  idl  '("Object" "ValueBase" "any" "boolean" "char" "double" "fixed" "float"
         "long" "octet" "sequence" "short" "string" "void" "wchar" "wstring"
         ;; In CORBA PSDL:
         "ref"
         ;; The following can't really end a type, but we have to specify them
         ;; here due to the assumption in `c-primitive-type-prefix-kwds'.  It
         ;; doesn't matter that much.
         "unsigned" "strong")
  pike '(;; this_program isn't really a keyword, but it's practically
         ;; used as a builtin type.
         "array" "float" "function" "int" "mapping" "mixed" "multiset"
         "object" "program" "string" "this_program" "void"))

(c-lang-defconst c-primitive-type-key
  ;; An adorned regexp that matches `c-primitive-type-kwds'.
  t (c-make-keywords-re t (c-lang-const c-primitive-type-kwds)))
(c-lang-defvar c-primitive-type-key (c-lang-const c-primitive-type-key))

(c-lang-defconst c-primitive-type-prefix-kwds
  "Keywords that might act as prefixes for primitive types.  Assumed to
be a subset of `c-primitive-type-kwds'."
  t       nil
  (c c++) '("long" "short" "signed" "unsigned")
  idl     '("long" "unsigned"
            ;; In CORBA PSDL:
            "strong"))

(c-lang-defconst c-type-prefix-kwds
  "Keywords where the following name - if any - is a type name, and
where the keyword together with the symbol works as a type in
declarations.

Note that an alternative if the second part doesn't hold is
`c-type-list-kwds'.  Keywords on this list are typically also present
on one of the `*-decl-kwds' lists."
  t    nil
  c    '("struct" "union" "enum")
  c++  (append '("class" "typename")
               (c-lang-const c-type-prefix-kwds c)))

(c-lang-defconst c-type-prefix-key
  ;; Adorned regexp matching `c-type-prefix-kwds'.
  t (c-make-keywords-re t (c-lang-const c-type-prefix-kwds)))
(c-lang-defvar c-type-prefix-key (c-lang-const c-type-prefix-key))

(c-lang-defconst c-type-modifier-kwds
  "Type modifier keywords.  These can occur almost anywhere in types
but they don't build a type of themselves.  Unlike the keywords on
`c-primitive-type-kwds', they are fontified with the keyword face and
not the type face."
  t    nil
  c    '("const" "restrict" "volatile")
  c++  '("const" "volatile" "throw")
  objc '("const" "volatile"))

(c-lang-defconst c-opt-type-modifier-key
  ;; Adorned regexp matching `c-type-modifier-kwds', or nil in
  ;; languages without such keywords.
  t (and (c-lang-const c-type-modifier-kwds)
         (c-make-keywords-re t (c-lang-const c-type-modifier-kwds))))
(c-lang-defvar c-opt-type-modifier-key (c-lang-const c-opt-type-modifier-key))

(c-lang-defconst c-opt-type-component-key
  ;; An adorned regexp that matches `c-primitive-type-prefix-kwds' and
  ;; `c-type-modifier-kwds', or nil in languages without any of them.
  t (and (or (c-lang-const c-primitive-type-prefix-kwds)
             (c-lang-const c-type-modifier-kwds))
         (c-make-keywords-re t
           (append (c-lang-const c-primitive-type-prefix-kwds)
                   (c-lang-const c-type-modifier-kwds)))))
(c-lang-defvar c-opt-type-component-key
  (c-lang-const c-opt-type-component-key))

(c-lang-defconst c-class-decl-kwds
  "Keywords introducing declarations where the following block (if any)
contains another declaration level that should be considered a class.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled.

Note that presence on this list does not automatically treat the
following identifier as a type; the keyword must also be present on
`c-type-prefix-kwds' or `c-type-list-kwds' to accomplish that."
  t    nil
  c    '("struct" "union")
  c++  '("class" "struct" "union")
  objc '("struct" "union"
         "@interface" "@implementation" "@protocol")
  java '("class" "interface")
  idl  '("component" "eventtype" "exception" "home" "interface" "struct"
         "union" "valuetype"
         ;; In CORBA PSDL:
         "storagehome" "storagetype"
         ;; In CORBA CIDL:
         "catalog" "executor" "manages" "segment")
  pike '("class"))

(c-lang-defconst c-class-key
  ;; Regexp matching the start of a class.
  t (c-make-keywords-re t (c-lang-const c-class-decl-kwds)))
(c-lang-defvar c-class-key (c-lang-const c-class-key))

(c-lang-defconst c-brace-list-decl-kwds
  "Keywords introducing declarations where the following block (if
any) is a brace list.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t    '("enum")
  (java awk) nil)

(c-lang-defconst c-brace-list-key
  ;; Regexp matching the start of declarations where the following
  ;; block is a brace list.
  t (c-make-keywords-re t (c-lang-const c-brace-list-decl-kwds)))
(c-lang-defvar c-brace-list-key (c-lang-const c-brace-list-key))

(c-lang-defconst c-other-block-decl-kwds
  "Keywords where the following block (if any) contain another
declaration level that should not be considered a class.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t   nil
  c   '("extern")
  c++ '("namespace" "extern")
  idl '("module"
        ;; In CORBA CIDL:
        "composition"))

(c-lang-defconst c-other-decl-block-key
  ;; Regexp matching the start of blocks besides classes that contain
  ;; another declaration level.
  t (c-make-keywords-re t (c-lang-const c-other-block-decl-kwds)))
(c-lang-defvar c-other-decl-block-key (c-lang-const c-other-decl-block-key))

(c-lang-defconst c-typedef-decl-kwds
  "Keywords introducing declarations where the identifiers are defined
to be types.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t    '("typedef")
  (java awk) nil)

(c-lang-defconst c-typeless-decl-kwds
  "Keywords introducing declarations where the identifier (declarator)
list follows directly after the keyword, without any type.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t    nil
  ;; Unlike most other languages, exception names are not handled as
  ;; types in IDL since they only can occur in "raises" specs.
  idl  '("exception" "factory" "finder" "native"
         ;; In CORBA PSDL:
         "key" "stores"
         ;; In CORBA CIDL:
         ;; Note that "manages" here clashes with its presence on
         ;; `c-type-list-kwds' for IDL.
         "executor" "facet" "manages" "segment")
  pike '("constant"))

(c-lang-defconst c-modifier-kwds
  "Keywords that can prefix normal declarations of identifiers
\(and typically acts as flags).  Things like argument declarations
inside function headers are also considered declarations in this
sense.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t    nil
  (c c++) '("auto" "extern" "inline" "register" "static")
  c++  (append '("explicit" "friend" "mutable" "template" "using" "virtual")
               (c-lang-const c-modifier-kwds))
  objc '("auto" "bycopy" "byref" "extern" "in" "inout" "oneway" "out" "static")
  ;; FIXME: Some of those below ought to be on `c-other-decl-kwds' instead.
  idl  '("abstract" "attribute" "const" "consumes" "custom" "emits" "import"
         "in" "inout" "local" "multiple" "oneway" "out" "private" "provides"
         "public" "publishes" "readonly" "typeid" "typeprefix" "uses"
         ;; In CORBA PSDL:
         "primary" "state"
         ;; In CORBA CIDL:
         "bindsTo" "delegatesTo" "implements" "proxy" "storedOn")
  ;; Note: "const" is not used in Java, but it's still a reserved keyword.
  java '("abstract" "const" "final" "native" "private" "protected" "public"
         "static" "strictfp" "synchronized" "transient" "volatile")
  pike '("final" "inline" "local" "nomask" "optional" "private" "protected"
         "public" "static" "variant"))

(c-lang-defconst c-other-decl-kwds
  "Keywords that can start or prefix any declaration level construct,
besides those on `c-class-decl-kwds', `c-brace-list-decl-kwds',
`c-other-block-decl-kwds', `c-typedef-decl-kwds',
`c-typeless-decl-kwds' and `c-modifier-kwds'.  In a declaration, these
keywords are also recognized inside or after the identifiers that
makes up the type.

If any of these also are on `c-type-list-kwds', `c-ref-list-kwds',
`c-colon-type-list-kwds', `c-paren-nontype-kwds', `c-paren-type-kwds',
`c-<>-type-kwds', or `c-<>-arglist-kwds' then the associated clauses
will be handled."
  t       nil
  (c c++) '("__declspec")               ; MSVC extension.
  objc    '("@class" "@end" "@defs")
  java    '("import" "package")
  pike    '("import" "inherit"))

(c-lang-defconst c-specifier-key
  ;; Adorned regexp matching keywords that can start a declaration but
  ;; not a type.
  t (c-make-keywords-re t
      (set-difference (append (c-lang-const c-class-decl-kwds)
                              (c-lang-const c-brace-list-decl-kwds)
                              (c-lang-const c-other-block-decl-kwds)
                              (c-lang-const c-typedef-decl-kwds)
                              (c-lang-const c-typeless-decl-kwds)
                              (c-lang-const c-modifier-kwds)
                              (c-lang-const c-other-decl-kwds))
                      (append (c-lang-const c-primitive-type-kwds)
                              (c-lang-const c-type-prefix-kwds)
                              (c-lang-const c-type-modifier-kwds))
                      :test 'string-equal)))
(c-lang-defvar c-specifier-key (c-lang-const c-specifier-key))

(c-lang-defconst c-protection-kwds
  "Protection label keywords in classes."
  t    nil
  c++  '("private" "protected" "public")
  objc '("@private" "@protected" "@public"))

(c-lang-defconst c-opt-access-key
  ;; Regexp matching an access protection label in a class, or nil in
  ;; languages that don't have such things.
  t    (if (c-lang-const c-protection-kwds)
           (c-make-keywords-re t (c-lang-const c-protection-kwds)))
  c++  (concat "\\("
               (c-make-keywords-re nil (c-lang-const c-protection-kwds))
               "\\)[ \t\n\r\f\v]*:"))
(c-lang-defvar c-opt-access-key (c-lang-const c-opt-access-key))

(c-lang-defconst c-block-decls-with-vars
  "Keywords introducing declarations that can contain a block which
might be followed by variable declarations, e.g. like \"foo\" in
\"class Foo { ... } foo;\".  So if there is a block in a declaration
like that, it ends with the following ';' and not right away.

The keywords on list are assumed to also be present on one of the
`*-decl-kwds' lists."
  t        nil
  (c objc) '("struct" "union" "enum" "typedef")
  c++      '("class" "struct" "union" "enum" "typedef"))

(c-lang-defconst c-opt-block-decls-with-vars-key
  ;; Regexp matching the `c-block-decls-with-vars' keywords, or nil in
  ;; languages without such constructs.
  t (and (c-lang-const c-block-decls-with-vars)
         (c-make-keywords-re t (c-lang-const c-block-decls-with-vars))))
(c-lang-defvar c-opt-block-decls-with-vars-key
  (c-lang-const c-opt-block-decls-with-vars-key))

(c-lang-defconst c-postfix-decl-spec-kwds
  "Keywords introducing extra declaration specifiers in the region
between the header and the body \(i.e. the \"K&R-region\") in
declarations."
  t    nil
  (c c++) '("__attribute__")            ; GCC extension.
  java '("extends" "implements" "throws")
  idl  '("context" "getraises" "manages" "primarykey" "raises" "setraises"
         "supports"
         ;; In CORBA PSDL:
         "as" "const" "implements" "of" "ref"))

(c-lang-defconst c-nonsymbol-sexp-kwds
  "Keywords that may be followed by a nonsymbol sexp before whatever
construct it's part of continues."
  t    nil
  (c c++ objc) '("extern"))

(c-lang-defconst c-type-list-kwds
  "Keywords that may be followed by a comma separated list of type
identifiers, where each optionally can be prefixed by keywords.  (Can
also be used for the special case when the list can contain only one
element.)

Assumed to be mutually exclusive with `c-ref-list-kwds'.  There's no
reason to put keywords on this list if they are on `c-type-prefix-kwds'.
There's also no reason to add keywords that prefixes a normal
declaration consisting of a type followed by a declarator (list), so
the keywords on `c-modifier-kwds' should normally not be listed here
too.

Note: Use `c-typeless-decl-kwds' for keywords followed by a function
or variable identifier (that's being defined)."
  t    '("struct" "union" "enum")
  (c c++ awk) nil
  objc (append '("@class" "@interface" "@implementation" "@protocol")
               (c-lang-const c-type-list-kwds))
  java '("class" "import" "interface" "new" "extends" "implements" "throws")
  idl  (append '("component" "eventtype" "home" "interface" "manages" "native"
                 "primarykey" "supports" "valuetype"
                 ;; In CORBA PSDL:
                 "as" "implements" "of" "scope" "storagehome" "storagetype")
               (c-lang-const c-type-list-kwds))
  pike '("class" "enum" "inherit"))

(c-lang-defconst c-ref-list-kwds
  "Keywords that may be followed by a comma separated list of
reference (i.e. namespace/scope/module) identifiers, where each
optionally can be prefixed by keywords.  (Can also be used for the
special case when the list can contain only one element.)  Assumed to
be mutually exclusive with `c-type-list-kwds'.

Note: Use `c-typeless-decl-kwds' for keywords followed by a function
or variable identifier (that's being defined)."
  t    nil
  c++  '("namespace")
  java '("package")
  idl  '("import" "module"
         ;; In CORBA CIDL:
         "composition")
  pike '("import"))

(c-lang-defconst c-colon-type-list-kwds
  "Keywords that may be followed (not necessarily directly) by a colon
and then a comma separated list of type identifiers, where each
optionally can be prefixed by keywords.  (Can also be used for the
special case when the list can contain only one element.)"
  t    nil
  c++  '("class" "struct")
  idl  '("component" "eventtype" "home" "interface" "valuetype"
         ;; In CORBA PSDL:
         "storagehome" "storagetype"))

(c-lang-defconst c-colon-type-list-re
  "Regexp matched after the keywords in `c-colon-type-list-kwds' to skip
forward to the colon.  The end of the match is assumed to be directly
after the colon, so the regexp should end with \":\" although that
isn't necessary.  Must be a regexp if `c-colon-type-list-kwds' isn't
nil."
  t (if (c-lang-const c-colon-type-list-kwds)
        ;; Disallow various common punctuation chars that can't come
        ;; before the ":" that starts the inherit list after "class"
        ;; or "struct" in C++.  (Also used as default for other
        ;; languages.)
        "[^\]\[{}();,/#=:]*:"))
(c-lang-defvar c-colon-type-list-re (c-lang-const c-colon-type-list-re))

(c-lang-defconst c-paren-nontype-kwds
  "Keywords that may be followed by a parenthesis expression that doesn't
contain type identifiers."
  t       nil
  (c c++) '("__declspec"))              ; MSVC extension.

(c-lang-defconst c-paren-type-kwds
  "Keywords that may be followed by a parenthesis expression containing
type identifiers separated by arbitrary tokens."
  t    nil
  c++  '("throw")
  objc '("@defs")
  idl  '("switch")
  pike '("array" "function" "int" "mapping" "multiset" "object" "program"))

(c-lang-defconst c-paren-any-kwds
  t (delete-duplicates (append (c-lang-const c-paren-nontype-kwds)
                               (c-lang-const c-paren-type-kwds))
                       :test 'string-equal))

(c-lang-defconst c-<>-type-kwds
  "Keywords that may be followed by an angle bracket expression
containing type identifiers separated by \",\".  The difference from
`c-<>-arglist-kwds' is that unknown names are taken to be types and
not other identifiers.  `c-recognize-<>-arglists' is assumed to be set
if this isn't nil."
  t    nil
  objc '("id")
  idl  '("sequence"
         ;; In CORBA PSDL:
         "ref"))

(c-lang-defconst c-<>-arglist-kwds
  "Keywords that can be followed by a C++ style template arglist; see
`c-recognize-<>-arglists' for details.  That language constant is
assumed to be set if this isn't nil."
  t    nil
  c++  '("template")
  idl  '("fixed" "string" "wstring"))

(c-lang-defconst c-<>-sexp-kwds
  ;; All keywords that can be followed by an angle bracket sexp.
  t (delete-duplicates (append (c-lang-const c-<>-type-kwds)
                               (c-lang-const c-<>-arglist-kwds))
                       :test 'string-equal))

(c-lang-defconst c-opt-<>-sexp-key
  ;; Adorned regexp matching keywords that can be followed by an angle
  ;; bracket sexp.
  t (if (c-lang-const c-recognize-<>-arglists)
        (c-make-keywords-re t (c-lang-const c-<>-sexp-kwds))))
(c-lang-defvar c-opt-<>-sexp-key (c-lang-const c-opt-<>-sexp-key))

(c-lang-defconst c-brace-id-list-kwds
  "Keywords that may be followed by a brace block containing a comma
separated list of identifier definitions, i.e. like the list of
identifiers that follows the type in a normal declaration."
  t (c-lang-const c-brace-list-decl-kwds))

(c-lang-defconst c-block-stmt-1-kwds
  "Statement keywords followed directly by a substatement."
  t    '("do" "else")
  c++  '("do" "else" "try")
  java '("do" "else" "finally" "try")
  idl  nil)

(c-lang-defconst c-block-stmt-1-key
  ;; Regexp matching the start of any statement followed directly by a
  ;; substatement (doesn't match a bare block, however).
  t (c-make-keywords-re t (c-lang-const c-block-stmt-1-kwds)))
(c-lang-defvar c-block-stmt-1-key (c-lang-const c-block-stmt-1-key))

(c-lang-defconst c-block-stmt-2-kwds
  "Statement keywords followed by a paren sexp and then by a substatement."
  t    '("for" "if" "switch" "while")
  c++  '("for" "if" "switch" "while" "catch")
  java '("for" "if" "switch" "while" "catch" "synchronized")
  idl  nil
  pike '("for" "if" "switch" "while" "foreach")
  awk  '("for" "if" "while"))

(c-lang-defconst c-block-stmt-2-key
  ;; Regexp matching the start of any statement followed by a paren sexp
  ;; and then by a substatement.
  t (c-make-keywords-re t (c-lang-const c-block-stmt-2-kwds)))
(c-lang-defvar c-block-stmt-2-key (c-lang-const c-block-stmt-2-key))

(c-lang-defconst c-opt-block-stmt-key
  ;; Regexp matching the start of any statement that has a
  ;; substatement (except a bare block).  Nil in languages that
  ;; don't have such constructs.
  t (if (or (c-lang-const c-block-stmt-1-kwds)
            (c-lang-const c-block-stmt-2-kwds))
        (c-make-keywords-re t
          (append (c-lang-const c-block-stmt-1-kwds)
                  (c-lang-const c-block-stmt-2-kwds)))))
(c-lang-defvar c-opt-block-stmt-key (c-lang-const c-opt-block-stmt-key))

(c-lang-defconst c-simple-stmt-kwds
  "Statement keywords followed by an expression or nothing."
  t    '("break" "continue" "goto" "return")
  ;; Note: `goto' is not valid in Java, but the keyword is still reserved.
  java '("break" "continue" "goto" "return" "throw")
  idl  nil
  pike '("break" "continue" "return")
  awk  '(;; Not sure about "delete", "exit", "getline", etc. ; ACM 2002/5/30
         "break" "continue" "return" "delete" "exit" "getline" "next"
         "nextfile" "print" "printf"))

(c-lang-defconst c-simple-stmt-key
  ;; Adorned regexp matching `c-simple-stmt-kwds'.
  t (c-make-keywords-re t (c-lang-const c-simple-stmt-kwds)))
(c-lang-defvar c-simple-stmt-key (c-lang-const c-simple-stmt-key))

(c-lang-defconst c-paren-stmt-kwds
  "Statement keywords followed by a parenthesis expression that
nevertheless contains a list separated with ';' and not ','."
  t    '("for")
  idl  nil)

(c-lang-defconst c-paren-stmt-key
  ;; Adorned regexp matching `c-paren-stmt-kwds'.
  t (c-make-keywords-re t (c-lang-const c-paren-stmt-kwds)))
(c-lang-defvar c-paren-stmt-key (c-lang-const c-paren-stmt-key))

(c-lang-defconst c-asm-stmt-kwds
  "Statement keywords followed by an assembler expression."
  t nil
  (c c++) '("asm" "__asm__")) ;; Not standard, but common.

(c-lang-defconst c-opt-asm-stmt-key
  ;; Regexp matching the start of an assembler statement.  Nil in
  ;; languages that don't support that.
  t (if (c-lang-const c-asm-stmt-kwds)
        (c-make-keywords-re t (c-lang-const c-asm-stmt-kwds))))
(c-lang-defvar c-opt-asm-stmt-key (c-lang-const c-opt-asm-stmt-key))

(c-lang-defconst c-label-kwds
  "Keywords introducing labels in blocks."
  t '("case" "default")
  awk nil)

(c-lang-defconst c-before-label-kwds
  "Keywords that might be followed by a label identifier."
  t    '("goto")
  (java pike) (append '("break" "continue")
                      (c-lang-const c-before-label-kwds))
  idl  nil
  awk  nil)

(c-lang-defconst c-label-kwds-regexp
  ;; Regexp matching any keyword that introduces a label.
  t (c-make-keywords-re t (c-lang-const c-label-kwds)))
(c-lang-defvar c-label-kwds-regexp (c-lang-const c-label-kwds-regexp))

(c-lang-defconst c-constant-kwds
  "Keywords for constants."
  t       nil
  (c c++) '("NULL" ;; Not a keyword, but practically works as one.
            "false" "true")             ; Defined in C99.
  objc    '("nil" "Nil")
  idl     '("TRUE" "FALSE")
  pike    '("UNDEFINED")) ;; Not a keyword, but practically works as one.

(c-lang-defconst c-primary-expr-kwds
  "Keywords besides constants and operators that start primary expressions."
  t    nil
  c++  '("operator" "this")
  objc '("super" "self")
  java '("this")
  pike '("this")) ;; Not really a keyword, but practically works as one.

(c-lang-defconst c-expr-kwds
  ;; Keywords that can occur anywhere in expressions.  Built from
  ;; `c-primary-expr-kwds' and all keyword operators in `c-operators'.
  t (delete-duplicates
     (append (c-lang-const c-primary-expr-kwds)
             (c-with-syntax-table (c-lang-const c-mode-syntax-table)
               (mapcan (lambda (op)
                         (and (string-match "\\`\\(\\w\\|\\s_\\)+\\'" op)
                              (list op)))
                       (c-lang-const c-operator-list))))
     :test 'string-equal))

(c-lang-defconst c-lambda-kwds
  "Keywords that start lambda constructs, i.e. function definitions in
expressions."
  t    nil
  pike '("lambda"))

(c-lang-defconst c-opt-lambda-key
  ;; Adorned regexp matching the start of lambda constructs, or nil in
  ;; languages that don't have such things.
  t (and (c-lang-const c-lambda-kwds)
         (c-make-keywords-re t (c-lang-const c-lambda-kwds))))
(c-lang-defvar c-opt-lambda-key (c-lang-const c-opt-lambda-key))

(c-lang-defconst c-inexpr-block-kwds
  "Keywords that start constructs followed by statement blocks which can
be used in expressions \(the gcc extension for this in C and C++ is
handled separately)."
  t    nil
  pike '("catch" "gauge"))

(c-lang-defconst c-opt-inexpr-block-key
  ;; Regexp matching the start of in-expression statements, or nil in
  ;; languages that don't have such things.
  t    nil
  pike (c-make-keywords-re t (c-lang-const c-inexpr-block-kwds)))
(c-lang-defvar c-opt-inexpr-block-key (c-lang-const c-opt-inexpr-block-key))

(c-lang-defconst c-inexpr-class-kwds
  "Keywords that can start classes inside expressions."
  t    nil
  java '("new")
  pike '("class"))

(c-lang-defconst c-opt-inexpr-class-key
  ;; Regexp matching the start of a class in an expression, or nil in
  ;; languages that don't have such things.
  t (and (c-lang-const c-inexpr-class-kwds)
         (c-make-keywords-re t (c-lang-const c-inexpr-class-kwds))))
(c-lang-defvar c-opt-inexpr-class-key (c-lang-const c-opt-inexpr-class-key))

(c-lang-defconst c-inexpr-brace-list-kwds
  "Keywords that can start brace list blocks inside expressions.
Note that Java specific rules are currently applied to tell this from
`c-inexpr-class-kwds'."
  t    nil
  java '("new"))

(c-lang-defconst c-opt-inexpr-brace-list-key
  ;; Regexp matching the start of a brace list in an expression, or
  ;; nil in languages that don't have such things.  This should not
  ;; match brace lists recognized through `c-special-brace-lists'.
  t (and (c-lang-const c-inexpr-brace-list-kwds)
         (c-make-keywords-re t (c-lang-const c-inexpr-brace-list-kwds))))
(c-lang-defvar c-opt-inexpr-brace-list-key
  (c-lang-const c-opt-inexpr-brace-list-key))

(c-lang-defconst c-any-class-key
  ;; Regexp matching the start of any class, both at top level and in
  ;; expressions.
  t (c-make-keywords-re t
      (append (c-lang-const c-class-decl-kwds)
              (c-lang-const c-inexpr-class-kwds))))
(c-lang-defvar c-any-class-key (c-lang-const c-any-class-key))

(c-lang-defconst c-decl-block-key
  ;; Regexp matching the start of any declaration-level block that
  ;; contain another declaration level, i.e. that isn't a function
  ;; block or brace list.
  t (c-make-keywords-re t
      (append (c-lang-const c-class-decl-kwds)
              (c-lang-const c-other-block-decl-kwds)
              (c-lang-const c-inexpr-class-kwds)))
  ;; In Pike modifiers might be followed by a block
  ;; to apply to several declarations.
  pike (concat (c-lang-const c-decl-block-key)
               "\\|"
               "\\(" (c-make-keywords-re nil
                       (c-lang-const c-modifier-kwds)) "\\)"
               (c-lang-const c-syntactic-ws)
               "{"))
(c-lang-defvar c-decl-block-key (c-lang-const c-decl-block-key))

(c-lang-defconst c-bitfield-kwds
  "Keywords that can introduce bitfields."
  t nil
  (c c++ objc) '("char" "int" "long" "signed" "unsigned"))

(c-lang-defconst c-opt-bitfield-key
  ;; Regexp matching the start of a bitfield (not uniquely), or nil in
  ;; languages without bitfield support.
  t       nil
  (c c++) (c-make-keywords-re t (c-lang-const c-bitfield-kwds)))
(c-lang-defvar c-opt-bitfield-key (c-lang-const c-opt-bitfield-key))

(c-lang-defconst c-other-kwds
  "Keywords not accounted for by any other `*-kwds' language constant."
  t    nil
  idl  '("truncatable"
         ;; In CORBA CIDL: (These are declaration keywords that never
         ;; can start a declaration.)
         "entity" "process" "service" "session" "storage"))

\f
;;; Constants built from keywords.

;; Note: No `*-kwds' language constants may be defined below this point.

(eval-and-compile
  (defconst c-kwds-lang-consts
    ;; List of all the language constants that contain keyword lists.
    (let (list)
      (mapatoms (lambda (sym)
                  (when (and (boundp sym)
                             (string-match "-kwds\\'" (symbol-name sym)))
                    ;; Make the list of globally interned symbols
                    ;; instead of ones interned in `c-lang-constants'.
                    (setq list (cons (intern (symbol-name sym)) list))))
                c-lang-constants)
      list)))

(c-lang-defconst c-keywords
  ;; All keywords as a list.
  t (delete-duplicates
     (c-lang-defconst-eval-immediately
      `(append ,@(mapcar (lambda (kwds-lang-const)
                           `(c-lang-const ,kwds-lang-const))
                         c-kwds-lang-consts)
               nil))
     :test 'string-equal))

(c-lang-defconst c-keywords-regexp
  ;; All keywords as an adorned regexp.
  t (c-make-keywords-re t (c-lang-const c-keywords)))
(c-lang-defvar c-keywords-regexp (c-lang-const c-keywords-regexp))

(c-lang-defconst c-keyword-member-alist
  ;; An alist with all the keywords in the cars.  The cdr for each
  ;; keyword is a list of the symbols for the `*-kwds' lists that
  ;; contains it.
  t (let ((kwd-list-alist
           (c-lang-defconst-eval-immediately
            `(list ,@(mapcar (lambda (kwds-lang-const)
                               `(cons ',kwds-lang-const
                                      (c-lang-const ,kwds-lang-const)))
                             c-kwds-lang-consts))))
          lang-const kwd-list kwd
          result-alist elem)
      (while kwd-list-alist
        (setq lang-const (caar kwd-list-alist)
              kwd-list (cdar kwd-list-alist)
              kwd-list-alist (cdr kwd-list-alist))
        (while kwd-list
          (setq kwd (car kwd-list)
                kwd-list (cdr kwd-list))
          (unless (setq elem (assoc kwd result-alist))
            (setq result-alist (cons (setq elem (list kwd)) result-alist)))
          (unless (memq lang-const (cdr elem))
            (setcdr elem (cons lang-const (cdr elem))))))
      result-alist))

(c-lang-defvar c-keywords-obarray
  ;; An obarray containing all keywords as symbols.  The property list
  ;; of each symbol has a non-nil entry for the specific `*-kwds'
  ;; lists it's a member of.
  ;;
  ;; E.g. to see whether the string str contains a keyword on
  ;; `c-class-decl-kwds', one can do like this:
  ;;     (get (intern-soft str c-keyword-obarray) 'c-class-decl-kwds)
  ;; Which preferably is written using the associated functions in
  ;; cc-engine:
  ;;     (c-keyword-member (c-keyword-sym str) 'c-class-decl-kwds)

  ;; The obarray is not stored directly as a language constant since
  ;; the printed representation for obarrays used in .elc files isn't
  ;; complete.

  (let* ((alist (c-lang-const c-keyword-member-alist))
         kwd lang-const-list
         (obarray (make-vector (* (length alist) 2) 0)))
    (while alist
      (setq kwd (caar alist)
            lang-const-list (cdar alist)
            alist (cdr alist))
      (setplist (intern kwd obarray)
                ;; Emacs has an odd bug that causes `mapcan' to fail
                ;; with unintelligible errors.  (XEmacs >= 20 works.)
                ;;(mapcan (lambda (lang-const)
                ;;            (list lang-const t))
                ;;          lang-const-list)
                (apply 'nconc (mapcar (lambda (lang-const)
                                        (list lang-const t))
                                      lang-const-list))))
    obarray))

(c-lang-defconst c-regular-keywords-regexp
  ;; Adorned regexp matching all keywords that aren't types or
  ;; constants.
  t (c-make-keywords-re t
      (set-difference (c-lang-const c-keywords)
                      (append (c-lang-const c-primitive-type-kwds)
                              (c-lang-const c-constant-kwds))
                      :test 'string-equal)))
(c-lang-defvar c-regular-keywords-regexp
  (c-lang-const c-regular-keywords-regexp))

(c-lang-defconst c-not-decl-init-keywords
  ;; Adorned regexp matching all keywords that can't appear at the
  ;; start of a declaration.
  t (c-make-keywords-re t
      (set-difference (c-lang-const c-keywords)
                      (append (c-lang-const c-primitive-type-kwds)
                              (c-lang-const c-type-prefix-kwds)
                              (c-lang-const c-type-modifier-kwds)
                              (c-lang-const c-class-decl-kwds)
                              (c-lang-const c-brace-list-decl-kwds)
                              (c-lang-const c-other-block-decl-kwds)
                              (c-lang-const c-typedef-decl-kwds)
                              (c-lang-const c-typeless-decl-kwds)
                              (c-lang-const c-modifier-kwds)
                              (c-lang-const c-other-decl-kwds))
                      :test 'string-equal)))
(c-lang-defvar c-not-decl-init-keywords
  (c-lang-const c-not-decl-init-keywords))

(c-lang-defconst c-primary-expr-regexp
  ;; Regexp matching the start of any primary expression, i.e. any
  ;; literal, symbol, prefix operator, and '('.  It doesn't need to
  ;; exclude keywords; they are excluded afterwards unless the second
  ;; submatch matches. If the first but not the second submatch
  ;; matches then it is an ambiguous primary expression; it could also
  ;; be a match of e.g. an infix operator. (The case with ambiguous
  ;; keyword operators isn't handled.)

  t (c-with-syntax-table (c-lang-const c-mode-syntax-table)
      (let* ((prefix-ops
              (mapcan (lambda (op)
                        ;; Filter out the special case prefix
                        ;; operators that are close parens.
                        (unless (string-match "\\s\)" op)
                          (list op)))
                      (mapcan
                       (lambda (opclass)
                         (when (eq (car opclass) 'prefix)
                           (append (cdr opclass) nil)))
                       (c-lang-const c-operators))))

             (nonkeyword-prefix-ops
              (mapcan (lambda (op)
                        (unless (string-match "\\`\\(\\w\\|\\s_\\)+\\'" op)
                          (list op)))
                      prefix-ops))

             (in-or-postfix-ops
              (mapcan (lambda (opclass)
                        (when (memq (car opclass)
                                    '(postfix
                                      left-assoc
                                      right-assoc
                                      right-assoc-sequence))
                          (append (cdr opclass) nil)))
                      (c-lang-const c-operators)))

             (unambiguous-prefix-ops (set-difference nonkeyword-prefix-ops
                                                     in-or-postfix-ops
                                                     :test 'string-equal))
             (ambiguous-prefix-ops (intersection nonkeyword-prefix-ops
                                                 in-or-postfix-ops
                                                 :test 'string-equal)))

        (concat
         "\\("
         ;; Take out all symbol class operators from `prefix-ops' and make the
         ;; first submatch from them together with `c-primary-expr-kwds'.
         (c-make-keywords-re t
           (append (c-lang-const c-primary-expr-kwds)
                   (set-difference prefix-ops nonkeyword-prefix-ops
                                   :test 'string-equal)))

         "\\|"
         ;; Match all ambiguous operators.
         (c-make-keywords-re nil
           (intersection nonkeyword-prefix-ops in-or-postfix-ops
                         :test 'string-equal))
         "\\)"

         "\\|"
         ;; Now match all other symbols.
         (c-lang-const c-symbol-start)

         "\\|"
         ;; The chars that can start integer and floating point
         ;; constants.
         "\\.?[0-9]"

         "\\|"
         ;; The nonambiguous operators from `prefix-ops'.
         (c-make-keywords-re nil
           (set-difference nonkeyword-prefix-ops in-or-postfix-ops
                           :test 'string-equal))

         "\\|"
         ;; Match string and character literals.
         "\\s\""
         (if (memq 'gen-string-delim c-emacs-features)
             "\\|\\s|"
           "")))))
(c-lang-defvar c-primary-expr-regexp (c-lang-const c-primary-expr-regexp))

\f
;;; Additional constants for parser-level constructs.

(c-lang-defconst c-decl-prefix-re
  "Regexp matching something that might precede a declaration or a cast,
such as the last token of a preceding statement or declaration.  It
should not match bob, though.  It can't require a match longer than
one token.  The end of the token is taken to be at the end of the
first submatch.  It must not include any following whitespace.  It's
undefined whether identifier syntax (see `c-identifier-syntax-table')
is in effect or not."
  ;; We match a sequence of characters to skip over things like \"};\"
  ;; more quickly.  We match ")" in C for K&R region declarations, and
  ;; in all languages except Java for when a cpp macro definition
  ;; begins with a declaration.
  t "\\([\{\}\(\);,]+\\)"
  java "\\([\{\}\(;,]+\\)"
  ;; Match "<" in C++ to get the first argument in a template arglist.
  ;; In that case there's an additional check in `c-find-decl-spots'
  ;; that it got open paren syntax.
  ;;
  ;; Also match a single ":" for protection labels.  We cheat a little
  ;; and require a symbol immediately before to avoid false matches
  ;; when starting directly on a single ":", which can be the start of
  ;; the base class initializer list in a constructor.
  c++ "\\([\{\}\(\);,<]+\\|\\(\\w\\|\\s_\\):\\)\\([^:]\\|\\'\\)"
  ;; Additionally match the protection directives in Objective-C.
  ;; Note that this doesn't cope with the longer directives, which we
  ;; would have to match from start to end since they don't end with
  ;; any easily recognized characters.
  objc (concat "\\([\{\}\(\);,]+\\|"
               (c-make-keywords-re nil (c-lang-const c-protection-kwds))
               "\\)")
  ;; Match ":" for switch labels inside union declarations in IDL.
  idl "\\([\{\}\(\);:,]+\\)\\([^:]\\|\\'\\)"
  ;; Pike is like C but we also match "[" for multiple value
  ;; assignments and type casts.
  pike "\\([\{\}\(\)\[;,]+\\)")
(c-lang-defvar c-decl-prefix-re (c-lang-const c-decl-prefix-re)
  'dont-doc)

(c-lang-defconst c-cast-parens
  ;; List containing the paren characters that can open a cast, or nil in
  ;; languages without casts.
  t (c-with-syntax-table (c-lang-const c-mode-syntax-table)
      (mapcan (lambda (opclass)
                (when (eq (car opclass) 'prefix)
                  (mapcan (lambda (op)
                            (when (string-match "\\`\\s\(\\'" op)
                              (list (elt op 0))))
                          (cdr opclass))))
              (c-lang-const c-operators))))
(c-lang-defvar c-cast-parens (c-lang-const c-cast-parens))

(c-lang-defconst c-type-decl-prefix-key
  "Regexp matching the operators that might precede the identifier in a
declaration, e.g. the \"*\" in \"char *argv\".  This regexp should
match \"(\" if parentheses are valid in type declarations.  The end of
the first submatch is taken as the end of the operator.  Identifier
syntax is in effect when this is matched (see `c-identifier-syntax-table')."
  t (if (c-lang-const c-type-modifier-kwds)
        (concat (c-regexp-opt (c-lang-const c-type-modifier-kwds) t) "\\>")
      ;; Default to a regexp that never matches.
      "\\<\\>")
  (c objc) (concat "\\("
                   "[*\(]"
                   "\\|"
                   (c-lang-const c-type-decl-prefix-key)
                   "\\)"
                   "\\([^=]\\|$\\)")
  c++  (concat "\\("
               "[*\(&]"
               "\\|"
               (concat "\\("    ; 2
                       ;; If this matches there's special treatment in
                       ;; `c-font-lock-declarators' and
                       ;; `c-font-lock-declarations' that check for a
                       ;; complete name followed by ":: *".
                       (c-lang-const c-identifier-start)
                       "\\)")
               "\\|"
               (c-lang-const c-type-decl-prefix-key)
               "\\)"
               "\\([^=]\\|$\\)")
  pike "\\([*\(!~]\\)\\([^=]\\|$\\)")
(c-lang-defvar c-type-decl-prefix-key (c-lang-const c-type-decl-prefix-key)
  'dont-doc)

(c-lang-defconst c-type-decl-suffix-key
  "Regexp matching the operators that might follow after the identifier
in a declaration, e.g. the \"[\" in \"char argv[]\".  This regexp
should match \")\" if parentheses are valid in type declarations.  If
it matches an open paren of some kind, the type declaration check
continues at the corresponding close paren, otherwise the end of the
first submatch is taken as the end of the operator.  Identifier syntax
is in effect when this is matched (see `c-identifier-syntax-table')."
  ;; Default to a regexp that matches `c-type-modifier-kwds' and a
  ;; function argument list parenthesis.
  t    (if (c-lang-const c-type-modifier-kwds)
           (concat "\\(\(\\|"
                   (c-regexp-opt (c-lang-const c-type-modifier-kwds) t) "\\>"
                   "\\)")
         "\\(\(\\)")
  (c c++ objc) (concat
                "\\("
                "[\)\[\(]"
                "\\|"
                ;; "throw" in `c-type-modifier-kwds' is followed by a
                ;; parenthesis list, but no extra measures are
                ;; necessary to handle that.
                (c-regexp-opt (c-lang-const c-type-modifier-kwds) t) "\\>"
                "\\)")
  (java idl) "\\([\[\(]\\)")
(c-lang-defvar c-type-decl-suffix-key (c-lang-const c-type-decl-suffix-key)
  'dont-doc)

(c-lang-defconst c-after-suffixed-type-decl-key
  "This regexp is matched after a type declaration expression where
`c-type-decl-suffix-key' has matched.  If it matches then the
construct is taken as a declaration.  It's typically used to match the
beginning of a function body or whatever might occur after the
function header in a function declaration or definition.  It's
undefined whether identifier syntax (see `c-identifier-syntax-table')
is in effect or not.

Note that it's used in cases like after \"foo (bar)\" so it should
only match when it's certain that it's a declaration, e.g \"{\" but
not \",\" or \";\"."
  t "{"
  ;; If K&R style declarations should be recognized then one could
  ;; consider to match the start of any symbol since we want to match
  ;; the start of the first declaration in the "K&R region".  That
  ;; could however produce false matches on code like "FOO(bar) x"
  ;; where FOO is a cpp macro, so it's better to leave it out and rely
  ;; on the other heuristics in that case.
  t (if (c-lang-const c-postfix-decl-spec-kwds)
        ;; Add on the keywords in `c-postfix-decl-spec-kwds'.
        (concat (c-lang-const c-after-suffixed-type-decl-key)
                "\\|"
                (c-make-keywords-re t (c-lang-const c-postfix-decl-spec-kwds)))
      (c-lang-const c-after-suffixed-type-decl-key))
  ;; Also match the colon that starts a base class initializer list in
  ;; C++.  That can be confused with a function call before the colon
  ;; in a ? : operator, but we count on that `c-decl-prefix-re' won't
  ;; match before such a thing (as a declaration-level construct;
  ;; matches inside arglist contexts are already excluded).
  c++ "[{:]")
(c-lang-defvar c-after-suffixed-type-decl-key
  (c-lang-const c-after-suffixed-type-decl-key)
  'dont-doc)

(c-lang-defconst c-after-suffixed-type-maybe-decl-key
  ;; Regexp that in addition to `c-after-suffixed-type-decl-key'
  ;; matches ";" and ",".
  t (concat "\\(" (c-lang-const c-after-suffixed-type-decl-key) "\\)"
            "\\|[;,]"))
(c-lang-defvar c-after-suffixed-type-maybe-decl-key
  (c-lang-const c-after-suffixed-type-maybe-decl-key))

(c-lang-defconst c-opt-type-concat-key
  "Regexp matching operators that concatenate types, e.g. the \"|\" in
\"int|string\" in Pike.  The end of the first submatch is taken as the
end of the operator.  nil in languages without such operators.  It's
undefined whether identifier syntax (see `c-identifier-syntax-table')
is in effect or not."
  t nil
  pike "\\([|.&]\\)\\($\\|[^|.&]\\)")
(c-lang-defvar c-opt-type-concat-key (c-lang-const c-opt-type-concat-key)
  'dont-doc)

(c-lang-defconst c-opt-type-suffix-key
  "Regexp matching operators that might follow after a type, or nil in
languages that don't have such operators.  The end of the first
submatch is taken as the end of the operator.  This should not match
things like C++ template arglists if `c-recognize-<>-arglists' is set.
It's undefined whether identifier syntax (see `c-identifier-syntax-table')
is in effect or not."
  t nil
  (c c++ objc pike) "\\(\\.\\.\\.\\)"
  java "\\(\\[[ \t\n\r\f\v]*\\]\\)")
(c-lang-defvar c-opt-type-suffix-key (c-lang-const c-opt-type-suffix-key))

(c-lang-defvar c-known-type-key
  ;; Regexp matching the known type identifiers.  This is initialized
  ;; from the type keywords and `*-font-lock-extra-types'.  The first
  ;; submatch is the one that matches the type.  Note that this regexp
  ;; assumes that symbol constituents like '_' and '$' have word
  ;; syntax.
  (let ((extra-types (when (boundp (c-mode-symbol "font-lock-extra-types"))
                       (c-mode-var "font-lock-extra-types"))))
    (concat "\\<\\("
            (c-make-keywords-re nil (c-lang-const c-primitive-type-kwds))
            (if (consp extra-types)
                (concat "\\|" (mapconcat 'identity extra-types "\\|"))
              "")
            "\\)\\>")))

(c-lang-defconst c-special-brace-lists
"List of open- and close-chars that makes up a pike-style brace list,
i.e. for a ([ ]) list there should be a cons (?\\[ . ?\\]) in this
list."
  t    nil
  pike '((?{ . ?}) (?\[ . ?\]) (?< . ?>)))
(c-lang-defvar c-special-brace-lists (c-lang-const c-special-brace-lists))

(c-lang-defconst c-recognize-knr-p
  "Non-nil means K&R style argument declarations are valid."
  t nil
  c t)
(c-lang-defvar c-recognize-knr-p (c-lang-const c-recognize-knr-p))

(c-lang-defconst c-recognize-typeless-decls
  "Non-nil means function declarations without return type should be
recognized.  That can introduce an ambiguity with parenthesized macro
calls before a brace block.  This setting does not affect declarations
that are preceded by a declaration starting keyword, so
e.g. `c-typeless-decl-kwds' may still be used when it's set to nil."
  t nil
  (c c++ objc) t)
(c-lang-defvar c-recognize-typeless-decls
  (c-lang-const c-recognize-typeless-decls))

(c-lang-defconst c-recognize-<>-arglists
  "Non-nil means C++ style template arglists should be handled.  More
specifically, this means a comma separated list of types or
expressions surrounded by \"<\" and \">\".  It's always preceded by an
identifier or one of the keywords on `c-<>-type-kwds' or
`c-<>-arglist-kwds'.  If there's an identifier before then the whole
expression is considered to be a type."
  t (or (consp (c-lang-const c-<>-type-kwds))
        (consp (c-lang-const c-<>-arglist-kwds))))
(c-lang-defvar c-recognize-<>-arglists (c-lang-const c-recognize-<>-arglists))

(c-lang-defconst c-recognize-paren-inits
  "Non-nil means that parenthesis style initializers exist,
i.e. constructs like

Foo bar (gnu);

in addition to the more classic

Foo bar = gnu;"
  t nil
  c++ t)
(c-lang-defvar c-recognize-paren-inits (c-lang-const c-recognize-paren-inits))

(c-lang-defconst c-opt-<>-arglist-start
  ;; Regexp matching the start of angle bracket arglists in languages
  ;; where `c-recognize-<>-arglists' is set.  Does not exclude
  ;; keywords outside `c-<>-arglist-kwds'.  The first submatch is
  ;; assumed to surround the preceding symbol.  The whole match is
  ;; assumed to end directly after the opening "<".
  t (if (c-lang-const c-recognize-<>-arglists)
        (concat "\\("
                (c-lang-const c-symbol-key)
                "\\)"
                (c-lang-const c-syntactic-ws)
                "<")))
(c-lang-defvar c-opt-<>-arglist-start (c-lang-const c-opt-<>-arglist-start))

(c-lang-defconst c-opt-<>-arglist-start-in-paren
  ;; Regexp that in addition to `c-opt-<>-arglist-start' matches close
  ;; parens.  The first submatch is assumed to surround
  ;; `c-opt-<>-arglist-start'.
  t (if (c-lang-const c-opt-<>-arglist-start)
        (concat "\\("
                (c-lang-const c-opt-<>-arglist-start)
                "\\)\\|\\s\)")))
(c-lang-defvar c-opt-<>-arglist-start-in-paren
  (c-lang-const c-opt-<>-arglist-start-in-paren))

(c-lang-defconst c-label-key
  "Regexp matching a normal label, i.e. a label that doesn't begin with
a keyword like switch labels.  It's only used at the beginning of a
statement."
  t "\\<\\>"
  (c c++ objc java pike) (concat "\\(" (c-lang-const c-symbol-key) "\\)"
                                 "[ \t\n\r\f\v]*:\\([^:]\\|$\\)"))
(c-lang-defvar c-label-key (c-lang-const c-label-key)
  'dont-doc)

(c-lang-defconst c-opt-postfix-decl-spec-key
  ;; Regexp matching the beginning of a declaration specifier in the
  ;; region between the header and the body of a declaration.
  ;;
  ;; TODO: This is currently not used uniformly; c++-mode and
  ;; java-mode each have their own ways of using it.
  t nil
  c++ (concat ":?[ \t\n\r\f\v]*\\(virtual[ \t\n\r\f\v]+\\)?\\("
              (c-make-keywords-re nil (c-lang-const c-protection-kwds))
              "\\)[ \t\n\r\f\v]+"
              "\\(" (c-lang-const c-symbol-key) "\\)")
  java (c-make-keywords-re t (c-lang-const c-postfix-decl-spec-kwds)))
(c-lang-defvar c-opt-postfix-decl-spec-key
  (c-lang-const c-opt-postfix-decl-spec-key))

(c-lang-defconst c-opt-friend-key
  ;; Regexp describing friend declarations classes, or nil in
  ;; languages that don't have such things.
  ;;
  ;; TODO: Ought to use `c-specifier-key' or similar, and the template
  ;; skipping isn't done properly.  This will disappear soon.
  t nil
  c++ "friend[ \t]+\\|template[ \t]*<.+>[ \t]*friend[ \t]+")
(c-lang-defvar c-opt-friend-key (c-lang-const c-opt-friend-key))

(c-lang-defconst c-opt-method-key
  ;; Special regexp to match the start of Objective-C methods.  The
  ;; first submatch is assumed to end after the + or - key.
  t nil
  objc (concat
        ;; TODO: Ought to use a better method than anchoring on bol.
        "^[ \t]*\\([+-]\\)[ \t\n\r\f\v]*"
        "\\(([^)]*)[ \t\n\r\f\v]*\\)?"  ; return type
        "\\(" (c-lang-const c-symbol-key) "\\)"))
(c-lang-defvar c-opt-method-key (c-lang-const c-opt-method-key))

\f
;;; Wrap up the `c-lang-defvar' system.

;; Compile in the list of language variables that has been collected
;; with the `c-lang-defvar' macro.  Note that the first element is
;; nil.
(defconst c-lang-variable-inits (cc-eval-when-compile c-lang-variable-inits))

(defun c-make-init-lang-vars-fun (mode)
  "Create a function that initializes all the language dependent variables
for the given mode.

This function should be evaluated at compile time, so that the
function it returns is byte compiled with all the evaluated results
from the language constants.  Use the `c-init-language-vars' macro to
accomplish that conveniently.

This function does not do any hidden buffer changes."

  (if (and (not load-in-progress)
           (boundp 'byte-compile-dest-file)
           (stringp byte-compile-dest-file))

      ;; No need to byte compile this lambda since the byte compiler is
      ;; smart enough to detect the `funcall' construct in the
      ;; `c-init-language-vars' macro below and compile it all straight
      ;; into the function that contains `c-init-language-vars'.
      `(lambda ()

         ;; This let sets up the context for `c-mode-var' and similar
         ;; that could be in the result from `cl-macroexpand-all'.
         (let ((c-buffer-is-cc-mode ',mode)
               current-var)
           (condition-case err

               (if (eq c-version-sym ',c-version-sym)
                   (setq ,@(let ((c-buffer-is-cc-mode mode)
                                 (c-lang-const-expansion 'immediate))
                             ;; `c-lang-const' will expand to the evaluated
                             ;; constant immediately in `cl-macroexpand-all'
                             ;; below.
                             (mapcan
                              (lambda (init)
                                `(current-var ',(car init)
                                  ,(car init) ,(cl-macroexpand-all
                                                (elt init 1))))
                              (cdr c-lang-variable-inits))))

                 (unless (get ',mode 'c-has-warned-lang-consts)
                   (message ,(concat "%s compiled with CC Mode %s "
                                     "but loaded with %s - evaluating "
                                     "language constants from source")
                            ',mode ,c-version c-version)
                   (put ',mode 'c-has-warned-lang-consts t))

                 (require 'cc-langs)
                 (let ((init (cdr c-lang-variable-inits)))
                   (while init
                     (setq current-var (caar init))
                     (set (caar init) (eval (cadar init)))
                     (setq init (cdr init)))))

             (error
              (if current-var
                  (message "Eval error in the `c-lang-defvar' for `%s': %S"
                           current-var err)
                (signal (car err) (cdr err)))))))

    ;; Being evaluated from source.  Always use the dynamic method to
    ;; work well when `c-lang-defvar's in this file are reevaluated
    ;; interactively.
    `(lambda ()
       (require 'cc-langs)
       (let ((c-buffer-is-cc-mode ',mode)
             (init (cdr c-lang-variable-inits))
             current-var)
         (condition-case err

             (while init
               (setq current-var (caar init))
               (set (caar init) (eval (cadar init)))
               (setq init (cdr init)))

           (error
            (if current-var
                (message "Eval error in the `c-lang-defvar' for `%s': %S"
                         current-var err)
              (signal (car err) (cdr err)))))))
    ))

(defmacro c-init-language-vars (mode)
  "Initialize all the language dependent variables for the given mode.
This macro is expanded at compile time to a form tailored for the mode
in question, so MODE must be a constant.  Therefore MODE is not
evaluated and should not be quoted.

This macro does not do any hidden buffer changes."
  `(funcall ,(c-make-init-lang-vars-fun mode)))

\f
(cc-provide 'cc-langs)

;;; cc-langs.el ends here