emacs/lisp/progmodes/cc-langs.el

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

;; Copyright (C) 1985,1987,1992-2001 Free Software Foundation, Inc.

;; Authors:    2000- Martin Stjernholm
;;	       1998-1999 Barry A. Warsaw and Martin Stjernholm
;;             1992-1997 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:

;;; 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)))
    (require 'cc-bytecomp)))

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


;; Some support functions that are used when the language specific
;; constants are built.  Since the constants are built during compile
;; time, these need to be defined then too.

(eval-and-compile
  ;; `require' in XEmacs doesn't have the third NOERROR argument.
  (condition-case nil (require 'regexp-opt) (file-error nil))

  (if (fboundp 'regexp-opt)
      (fset 'c-regexp-opt (symbol-function 'regexp-opt))
    ;; Emacs 19.34 doesn't have the regexp-opt package.
    (defun c-regexp-opt (strings &optional paren)
      (if paren
	  (concat "\\(" (mapconcat 'regexp-quote strings "\\|") "\\)")
	(mapconcat 'regexp-quote strings "\\|"))))

  (if (fboundp 'regexp-opt-depth)
      (fset 'c-regexp-opt-depth (symbol-function 'regexp-opt-depth))
    ;; Emacs 19.34 doesn't have the regexp-opt package.
    (defun c-regexp-opt-depth (regexp)
      ;; This is the definition of `regexp-opt-depth' in Emacs 20.
      (save-match-data
	;; Hack to signal an error if REGEXP does not have balanced
	;; parentheses.
	(string-match regexp "")
	;; Count the number of open parentheses in REGEXP.
	(let ((count 0) start)
	  (while (string-match "\\\\(" regexp start)
	    (setq count (1+ count) start (match-end 0)))
	  count))))

  (defun c-delete-duplicates (list)
    (let ((tail list))
      (while tail
	(setcdr tail (delete (car tail) (cdr tail)))
	(setq tail (cdr tail)))
      list))

  (defun c-make-keywords-re (adorn &rest lists)
    "Make a regexp that matches all the strings in all the lists.
Duplicates in the lists are removed.  The regexp may contain zero or
more submatch expressions.  If ADORN is non-nil there will be at least
one submatch which matches the whole keyword, and the regexp will also
not match a prefix of any identifier.  Adorned regexps cannot be
appended."
    (let ((list (copy-sequence (apply 'append lists))))
      (setq list (c-delete-duplicates list))
      (if list
	  (let ((re (c-regexp-opt list)))
	    ;; Add our own grouping parenthesis around re instead of
	    ;; passing adorn to regexp-opt, since it in XEmacs makes the
	    ;; top level grouping "shy".
	    (if adorn
		(concat "\\(" re "\\)\\>\\([^_]\\|$\\)")
	      re))
	"\\<\\>"				; Matches nothing.
	)))
  (put 'c-make-keywords-re 'lisp-indent-function 1)
  )


;; Building of constants that are parameterized on a per-language
;; basis.

(eval-and-compile
  (defvar c-macroexpand-mode nil
    ;; Dynamically bound to the mode symbol during `c-lang-defconst'
    ;; so that `c-lang-var' can do the right expansion.
    )

  (defmacro c-lang-defconst (var &rest args)
    ;; Sets the mode specific values of the constant VAR.  The rest of
    ;; the arguments are one or more repetitions of MODE VAL.  MODE is
    ;; the mode name without the "-mode" suffix, or a list of such
    ;; mode names, or `all' as a shortcut for a list of all modes.
    ;; VAL is evaluated (during compilation) for each mode with
    ;; `c-macroexpand-mode' temporarily bound, so `c-lang-var' without
    ;; an explicit mode may be used within it.  The assignments in
    ;; ARGS are processed in sequence, similar to `setq'.
    (let* ((res (list 'progn))
	   (res-tail res))
      (while args
	(let ((mode (car args)))
	  (cond ((eq mode 'all)
		 (setq mode '(c c++ objc java idl pike)))
		((symbolp mode)
		 (setq mode (list mode))))
	  (while mode
	    (let* ((c-macroexpand-mode
		    (intern (concat (symbol-name (car mode)) "-mode")))
		   (val (eval (car (cdr args)))))
	      ;; Need to install the value also during compilation,
	      ;; since val might refer to earlier mode specific
	      ;; values.
	      (put var c-macroexpand-mode val)
	      (setcdr res-tail (list `(put ',var ',c-macroexpand-mode ',val)))
	      (setq res-tail (cdr res-tail)))
	    (setq mode (cdr mode))))
	(setq args (cdr (cdr args))))
      res))
  (put 'c-lang-defconst 'lisp-indent-function 1)

  (defmacro c-lang-var (var &optional mode)
    ;; Get the mode specific value of the variable VAR in mode MODE.
    ;; MODE is the mode name without the "-mode" suffix.  It may also
    ;; be nil to use the current value of `c-macroexpand-mode' (which
    ;; is useful inside `c-lang-defconst') or `c-buffer-is-cc-mode'
    ;; (which is useful inside `c-lang-defvar').
    `(get ',var ,(if (eq mode 'nil)
		     (if c-macroexpand-mode
			 ;; In the macro expansion of c-lang-defconst.
			 `(quote ,c-macroexpand-mode)
		       `c-buffer-is-cc-mode)
		   `(quote ,(intern (concat (symbol-name mode) "-mode"))))))

  ;; These are used to collect the init forms from the subsequent
  ;; `c-lang-defvar'.  They become a big setq in the
  ;; `c-init-lang-defvars' lambda below.
  (defconst c-lang-defvar-init-form (list 'setq))
  (defvar c-lang-defvar-init-form-tail nil)
  (setq c-lang-defvar-init-form-tail c-lang-defvar-init-form)

  (defmacro c-lang-defvar (var val)
    ;; Declares the buffer local variable VAR to get the value VAL at
    ;; mode initialization, at which point VAL is evaluated.
    ;; `c-lang-var' is typically used in VAL to get the right value
    ;; according to `c-buffer-is-cc-mode'.
    (setcdr c-lang-defvar-init-form-tail (list var val))
    (setq c-lang-defvar-init-form-tail
	  (cdr (cdr c-lang-defvar-init-form-tail)))
    `(progn
       (defvar ,var nil)
       (make-variable-buffer-local ',var)))
  (put 'c-lang-defvar 'lisp-indent-function 1)
  )

;; Regexp describing a `symbol' in all languages, not excluding
;; keywords.
(c-lang-defconst c-symbol-key
  (c c++ objc java idl)
  (if (string-match "[[:alpha:]]" "a")
      "[[:alpha:]_][[:alnum:]_]*"	; Emacs 21.
    ;; We cannot use just `word' syntax class since `_' cannot be
    ;; in word class.  Putting underscore in word class breaks
    ;; forward word movement behavior that users are familiar
    ;; with.  Besides, it runs counter to Emacs convention.
    "[a-zA-Z_]\\(\\w\\|_\\)*")
  pike (concat "\\(" (c-lang-var c-symbol-key c) "\\|"
	       (c-make-keywords-re nil
		 '("`+" "`-" "`&" "`|" "`^" "`<<" "`>>" "`*" "`/" "`%" "`~"
		   "`==" "`<" "`>" "`!" "`[]" "`[]=" "`->" "`->=" "`()" "``+"
		   "``-" "``&" "``|" "``^" "``<<" "``>>" "``*" "``/" "``%"
		   "`+="))
	       "\\)"))
(c-lang-defvar c-symbol-key (c-lang-var c-symbol-key))

;; Number of regexp grouping parens in c-symbol-key.
(c-lang-defvar c-symbol-key-depth (c-regexp-opt-depth c-symbol-key))

(defvar 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 "?:".

(defvar c-stmt-delim-chars-with-comma "^;,{}?:")
;; Variant of c-stmt-delim-chars that additionally contains ','.

;; HELPME: Many of the following keyword lists are more or less bogus
;; for some languages (notably ObjC and IDL).  The effects of the
;; erroneous values in the language handling are mostly negligible
;; since the constants that actually matter in the syntax detection
;; code are mostly correct in the situations they are used, but I'd
;; still appreciate help to get them correct for other uses.

;; Primitive type keywords.
(c-lang-defconst c-primitive-type-kwds
  (c c++ objc idl) '("char" "double" "float" "int" "long" "short"
		     "signed" "unsigned" "void")
  java '("boolean" "byte" "char" "double" "float" "int" "long" "short" "void")
  pike '("constant" "float" "int" "mapping" "multiset" "object" "program"
	 "string" "void"))

;; Declaration specifier keywords.
(c-lang-defconst c-specifier-kwds
  c '("auto" "const" "extern" "register" "static" "volatile")
  (c++ objc idl) (append '("friend" "inline" "virtual")
			 (c-lang-var c-specifier-kwds c))
  ;; Note: `const' is not used in Java, but it's still a reserved keyword.
  java '("abstract" "const" "final" "native" "private" "protected"
	 "public" "static" "synchronized" "transient" "volatile")
  pike '("final" "inline" "local" "nomask" "optional" "private"
	 "protected" "static" "variant"))

;; Class/struct declaration keywords.
(c-lang-defconst c-class-kwds
  c '("struct" "union")
  c++ '("class" "struct" "union")
  objc '("interface" "implementation")
  java '("class" "interface")
  idl '("interface" "valuetype" "class" "struct" "union")
  pike '("class"))

;; Regexp matching the start of a class.
(c-lang-defconst c-class-key
  all (c-make-keywords-re t (c-lang-var c-class-kwds)))
(c-lang-defconst c-class-key		; ObjC needs some tuning of the regexp.
   objc (concat "@" (c-lang-var c-class-key)))
(c-lang-defvar c-class-key (c-lang-var c-class-key))

;; Keywords introducing blocks besides classes that contain another
;; declaration level.
(c-lang-defconst c-other-decl-block-kwds
  c '("extern")
  c++ '("namespace" "extern")
  idl '("module"))

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

;; 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.
(c-lang-defconst c-block-decls-with-vars
  c '("struct" "union" "enum" "typedef")
  c++ '("class" "struct" "union" "enum" "typedef"))

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

;; Keywords introducing declarations that has not been accounted for
;; by any of the above.
(c-lang-defconst c-other-decl-kwds
  ;; FIXME: Shouldn't "template" be moved to c-specifier-kwds for C++?
  c++ '("template")
  java '("import" "package")
  pike '("import" "inherit"))

;; Keywords introducing extra declaration specifiers in the region
;; between the header and the body (i.e. the "K&R-region") in
;; declarations.
(c-lang-defconst c-decl-spec-kwds java '("extends" "implements" "throws"))

;; Protection label keywords in classes.
(c-lang-defconst c-protection-kwds
  (c++ objc) '("private" "protected" "public"))

;; Statement keywords followed directly by a substatement.
(c-lang-defconst c-block-stmt-1-kwds
  (c pike) '("do" "else")
  (c++ objc) '("do" "else" "asm" "try")
  java '("do" "else" "finally" "try"))

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

;; Statement keywords followed by a paren sexp and then by a substatement.
(c-lang-defconst c-block-stmt-2-kwds
  c '("for" "if" "switch" "while")
  (c++ objc) '("for" "if" "switch" "while" "catch")
  java '("for" "if" "switch" "while" "catch" "synchronized")
  pike '("for" "if" "switch" "while" "foreach"))

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

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

;; Statement keywords followed by an expression or nothing.
(c-lang-defconst c-simple-stmt-kwds
  (c c++ objc) '("break" "continue" "goto" "return")
  ;; Note: `goto' is not valid in Java, but the keyword is still reserved.
  java '("break" "continue" "goto" "return" "throw")
  pike '("break" "continue" "return"))

;; Statement keywords followed by an assembler expression.
(c-lang-defconst c-asm-stmt-kwds
  (c c++) '("asm" "__asm__"))

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

;; Keywords introducing labels in blocks.
(c-lang-defconst c-label-kwds (c c++ objc java pike) '("case" "default"))

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

;; Keywords that can occur anywhere in expressions.
(c-lang-defconst c-expr-kwds
  (c objc) '("sizeof")
  c++ '("sizeof" "delete" "new" "operator" "this" "throw")
  java '("instanceof" "new" "super" "this")
  pike '("sizeof" "catch" "class" "gauge" "lambda" "predef"))

;; Keywords that start lambda constructs, i.e. function definitions in
;; expressions.
(c-lang-defconst c-lambda-kwds pike '("lambda"))

;; Regexp matching the start of lambda constructs, or nil in languages
;; that doesn't have such things.
(c-lang-defconst c-opt-lambda-key
  pike (c-make-keywords-re t (c-lang-var c-lambda-kwds)))
(c-lang-defvar c-opt-lambda-key (c-lang-var c-opt-lambda-key))

;; 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).
(c-lang-defconst c-inexpr-block-kwds pike '("catch" "gauge"))

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

;; Keywords that start classes in expressions.
(c-lang-defconst c-inexpr-class-kwds
  java '("new")
  pike '("class"))

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

;; Regexp matching the start of any class, both at top level and in
;; expressions.
(c-lang-defconst c-any-class-key
  all (c-make-keywords-re t
	(c-lang-var c-class-kwds)
	(c-lang-var c-inexpr-class-kwds)))
(c-lang-defconst c-any-class-key	; ObjC needs some tuning of the regexp.
  objc (concat "@" (c-lang-var c-any-class-key)))
(c-lang-defvar c-any-class-key (c-lang-var c-any-class-key))

;; Regexp matching the start of any declaration-level block that
;; contain another declaration level, i.e. that isn't a function
;; block.
(c-lang-defconst c-decl-block-key
  all (c-make-keywords-re t
	(c-lang-var c-class-kwds)
	(c-lang-var c-other-decl-block-kwds)
	(c-lang-var c-inexpr-class-kwds)))
(c-lang-defconst c-decl-block-key	; ObjC needs some tuning of the regexp.
  objc (concat "@" (c-lang-var c-decl-block-key)))
(c-lang-defvar c-decl-block-key (c-lang-var c-decl-block-key))

;; Keywords that can introduce bitfields.
(c-lang-defconst c-bitfield-kwds
  (c c++) '("char" "int" "long" "signed" "unsigned"))

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

;; All keywords as a list.
(c-lang-defconst c-keywords
  all (c-delete-duplicates
       (append (c-lang-var c-primitive-type-kwds)
	       (c-lang-var c-specifier-kwds)
	       (c-lang-var c-class-kwds)
	       (c-lang-var c-other-decl-block-kwds)
	       (c-lang-var c-block-decls-with-vars)
	       (c-lang-var c-other-decl-kwds)
	       (c-lang-var c-decl-spec-kwds)
	       (c-lang-var c-protection-kwds)
	       (c-lang-var c-block-stmt-1-kwds)
	       (c-lang-var c-block-stmt-2-kwds)
	       (c-lang-var c-simple-stmt-kwds)
	       (c-lang-var c-asm-stmt-kwds)
	       (c-lang-var c-label-kwds)
	       (c-lang-var c-expr-kwds)
	       (c-lang-var c-lambda-kwds)
	       (c-lang-var c-inexpr-block-kwds)
	       (c-lang-var c-inexpr-class-kwds)
	       (c-lang-var c-bitfield-kwds)
	       nil)))
(c-lang-defvar c-keywords (c-lang-var c-keywords))

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

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

;; Regexp matching a normal label, i.e. not a label that's recognized
;; with a keyword, like switch labels.  It's only used at the
;; beginning of a statement.
(c-lang-defconst c-label-key
  all (concat (c-lang-var c-symbol-key) "[ \t\n\r]*:\\([^:]\\|$\\)"))
(c-lang-defvar c-label-key (c-lang-var c-label-key))

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

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

;; Special regexp to match the start of methods.
(c-lang-defconst c-opt-method-key
  objc (concat
	"^\\s *[+-]\\s *"
	"\\(([^)]*)\\)?"		; return type
	;; \\s- in objc syntax table does not include \n
	;; since it is considered the end of //-comments.
	"[ \t\n]*" (c-lang-var c-symbol-key)))
(c-lang-defvar c-opt-method-key (c-lang-var c-opt-method-key))

;; Name of functions in cpp expressions that take an identifier as the
;; argument.
(c-lang-defconst c-cpp-defined-fns
  (c c++) '("defined")
  pike '("defined" "efun" "constant"))

;; List of open- and close-chars that makes up a pike-style brace
;; list, i.e. for a `([<5B>])' list there should be a cons (?\[ . ?\]) in
;; this list.
(c-lang-defconst c-special-brace-lists pike '((?{ . ?})
					      (?\[ . ?\])
					      (?< . ?>)))
(c-lang-defvar c-special-brace-lists (c-lang-var c-special-brace-lists))

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

;; Regexp to match the start of any type of comment.
;;
;; FIXME: Ought to use c-comment-prefix-regexp with some modifications
;; instead of this.
(c-lang-defconst c-comment-start-regexp
  (c c++ objc idl pike) "/[/*]"
  ;; We need to match all 3 Java style comments
  ;; 1) Traditional C block; 2) javadoc /** ...; 3) C++ style
  java "/\\(/\\|[*][*]?\\)")
(c-lang-defvar c-comment-start-regexp (c-lang-var c-comment-start-regexp))

;; Strings that starts and ends comments inserted with M-; etc.
;; comment-start and comment-end are initialized from these.
(c-lang-defconst comment-start
  c "/* "
  (c++ objc java idl pike) "// ")
(c-lang-defvar comment-start (c-lang-var comment-start))
(c-lang-defconst comment-end
  c "*/"
  (c++ objc java idl pike) "")
(c-lang-defvar comment-end (c-lang-var comment-end))

;; Regexp that matches when there is no syntactically significant text
;; before eol.  Macros are regarded as syntactically significant text
;; here.
(c-lang-defvar c-syntactic-eol
  (concat (concat
	   ;; Match horizontal whitespace and block comments that
	   ;; doesn't contain newlines.
	   "\\(\\s \\|"
	   (concat "/\\*"
		   "\\([^*\n\r]\\|\\*[^/\n\r]\\)*"
		   "\\*/")
	   "\\)*")
	  (concat
	   ;; Match eol (possibly inside a block comment), 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]\\)*"
		   "\\)?"
		   "$")
	   "\\|//\\)")))

;; Regexp to append to paragraph-start.
(c-lang-defconst paragraph-start
  (c c++ objc idl) "$"
  java "\\(@[a-zA-Z]+\\>\\|$\\)"	; For Javadoc.
  pike "\\(@[a-zA-Z]+\\>\\([^{]\\|$\\)\\|$\\)") ; For Pike refdoc.

;; Regexp to append to paragraph-separate.
(c-lang-defconst paragraph-separate
  (c c++ objc java idl) "$"
  pike (c-lang-var paragraph-start))

;; Prefix added to `c-current-comment-prefix' to set
;; `c-opt-in-comment-lc', or nil if it should be nil.
(c-lang-defconst c-in-comment-lc-prefix pike "@[\n\r]\\s *")

;; Regexp to match in-comment line continuations, or nil in languages
;; where that isn't applicable.  It's assumed that it only might match
;; from and including the last character on a line.  Built from
;; *-in-comment-lc-prefix and the current value of
;; c-current-comment-prefix.
(c-lang-defvar c-opt-in-comment-lc
  (if (c-lang-var c-in-comment-lc-prefix)
      (concat (c-lang-var c-in-comment-lc-prefix)
	      c-current-comment-prefix)))

(defconst c-init-lang-defvars
  ;; Make a lambda of the collected `c-lang-defvar' initializations.
  (cc-eval-when-compile
    (if (cc-bytecomp-is-compiling)
	(byte-compile-lambda `(lambda () ,c-lang-defvar-init-form))
      `(lambda () ,c-lang-defvar-init-form))))

(defun c-init-language-vars ()
  ;; Initialize all `c-lang-defvar' variables according to
  ;; `c-buffer-is-cc-mode'.
  (if (not (memq c-buffer-is-cc-mode
		 '(c-mode c++-mode objc-mode java-mode idl-mode pike-mode)))
      (error "Cannot initialize language variables for unknown mode %s"
	     c-buffer-is-cc-mode))
  (funcall c-init-lang-defvars))

;; Regexp trying to describe the beginning of a Java top-level
;; definition.  This is not used by CC Mode, nor is it maintained
;; since it's practically impossible to write a regexp that reliably
;; matches such a construct.  Other tools are necessary.
(defconst c-Java-defun-prompt-regexp
  "^[ \t]*\\(\\(\\(public\\|protected\\|private\\|const\\|abstract\\|synchronized\\|final\\|static\\|threadsafe\\|transient\\|native\\|volatile\\)\\s-+\\)*\\(\\(\\([[a-zA-Z][][_$.a-zA-Z0-9]*[][_$.a-zA-Z0-9]+\\|[[a-zA-Z]\\)\\s-*\\)\\s-+\\)\\)?\\(\\([[a-zA-Z][][_$.a-zA-Z0-9]*\\s-+\\)\\s-*\\)?\\([_a-zA-Z][^][ \t:;.,{}()=]*\\|\\([_$a-zA-Z][_$.a-zA-Z0-9]*\\)\\)\\s-*\\(([^);{}]*)\\)?\\([] \t]*\\)\\(\\s-*\\<throws\\>\\s-*\\(\\([_$a-zA-Z][_$.a-zA-Z0-9]*\\)[, \t\n\r\f]*\\)+\\)?\\s-*")


;; Syntax tables.

(defun c-populate-syntax-table (table)
  ;; Populate the syntax 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 ?\' "\""    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 19 & 20
   ((memq '8-bit c-emacs-features)
    (modify-syntax-entry ?/  ". 1456" table)
    (modify-syntax-entry ?*  ". 23"   table))
   ;; Emacs 19 & 20
   ((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))

;;;###autoload
(defvar c-mode-syntax-table nil
  "Syntax table used in c-mode buffers.")
(if c-mode-syntax-table
    ()
  (setq c-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table c-mode-syntax-table))

;;;###autoload
(defvar c++-mode-syntax-table nil
  "Syntax table used in c++-mode buffers.")
(if c++-mode-syntax-table
    ()
  (setq c++-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table c++-mode-syntax-table))

(defvar c++-template-syntax-table nil
  "A variant of `c++-mode-syntax-table' that defines `<' and `>' as
parenthesis characters.  Used temporarily when template argument lists
are parsed.")
(if c++-template-syntax-table
    ()
  (setq c++-template-syntax-table
	(copy-syntax-table c++-mode-syntax-table))
  (modify-syntax-entry ?< "(>" c++-template-syntax-table)
  (modify-syntax-entry ?> ")<" c++-template-syntax-table))

;;;###autoload
(defvar objc-mode-syntax-table nil
  "Syntax table used in objc-mode buffers.")
(if objc-mode-syntax-table
    ()
  (setq objc-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table objc-mode-syntax-table)
  ;; add extra Objective-C only syntax
  (modify-syntax-entry ?@ "_" objc-mode-syntax-table))

;;;###autoload
(defvar java-mode-syntax-table nil
  "Syntax table used in java-mode buffers.")
(if java-mode-syntax-table
    ()
  (setq java-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table java-mode-syntax-table))

;;;###autoload
(defvar idl-mode-syntax-table nil
  "Syntax table used in idl-mode buffers.")
(if idl-mode-syntax-table
    nil
  (setq idl-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table idl-mode-syntax-table))

;;;###autoload
(defvar pike-mode-syntax-table nil
  "Syntax table used in pike-mode buffers.")
(if pike-mode-syntax-table
    ()
  (setq pike-mode-syntax-table (make-syntax-table))
  (c-populate-syntax-table pike-mode-syntax-table)
  (modify-syntax-entry ?@ "." pike-mode-syntax-table))


;; internal state variables

;; Internal state of hungry delete key feature
(defvar c-hungry-delete-key nil)
(make-variable-buffer-local 'c-hungry-delete-key)

;; Internal state of auto newline feature.
(defvar c-auto-newline nil)
(make-variable-buffer-local 'c-auto-newline)

;; Internal auto-newline/hungry-delete designation string for mode line.
(defvar c-auto-hungry-string nil)
(make-variable-buffer-local 'c-auto-hungry-string)


(cc-provide 'cc-langs)

;;; cc-langs.el ends here