Mercurial > hg > xemacs-beta
diff lisp/cc-mode/cc-styles.el @ 165:5a88923fcbfe r20-3b9
Import from CVS: tag r20-3b9
author | cvs |
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date | Mon, 13 Aug 2007 09:44:42 +0200 |
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children | 85ec50267440 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/lisp/cc-mode/cc-styles.el Mon Aug 13 09:44:42 2007 +0200 @@ -0,0 +1,621 @@ +;;; cc-styles.el --- support for styles in CC Mode + +;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc. + +;; Authors: 1992-1997 Barry A. Warsaw +;; 1987 Dave Detlefs and Stewart Clamen +;; 1985 Richard M. Stallman +;; Maintainer: cc-mode-help@python.org +;; Created: 22-Apr-1997 (split from cc-mode.el) +;; Version: 5.11 +;; 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. + +(eval-when-compile + (load-file "./cc-align.el")) + + +(defconst c-style-alist + '(("gnu" + (c-basic-offset . 2) + (c-comment-only-line-offset . (0 . 0)) + (c-offsets-alist . ((statement-block-intro . +) + (knr-argdecl-intro . 5) + (substatement-open . +) + (label . 0) + (statement-case-open . +) + (statement-cont . +) + (arglist-intro . c-lineup-arglist-intro-after-paren) + (arglist-close . c-lineup-arglist) + )) + (c-special-indent-hook . c-gnu-impose-minimum) + ) + ("k&r" + (c-basic-offset . 5) + (c-comment-only-line-offset . 0) + (c-offsets-alist . ((statement-block-intro . +) + (knr-argdecl-intro . 0) + (substatement-open . 0) + (label . 0) + (statement-cont . +) + )) + ) + ("bsd" + (c-basic-offset . 4) + (c-comment-only-line-offset . 0) + (c-offsets-alist . ((statement-block-intro . +) + (knr-argdecl-intro . +) + (substatement-open . 0) + (label . 0) + (statement-cont . +) + )) + ) + ("stroustrup" + (c-basic-offset . 4) + (c-comment-only-line-offset . 0) + (c-offsets-alist . ((statement-block-intro . +) + (substatement-open . 0) + (label . 0) + (statement-cont . +) + )) + ) + ("whitesmith" + (c-basic-offset . 4) + (c-comment-only-line-offset . 0) + (c-offsets-alist . ((statement-block-intro . +) + (knr-argdecl-intro . +) + (substatement-open . 0) + (label . 0) + (statement-cont . +) + )) + + ) + ("ellemtel" + (c-basic-offset . 3) + (c-comment-only-line-offset . 0) + (c-hanging-braces-alist . ((substatement-open before after))) + (c-offsets-alist . ((topmost-intro . 0) + (topmost-intro-cont . 0) + (substatement . +) + (substatement-open . 0) + (case-label . +) + (access-label . -) + (inclass . ++) + (inline-open . 0) + )) + ) + ("linux" + (c-basic-offset . 8) + (c-comment-only-line-offset . 0) + (c-hanging-braces-alist . ((brace-list-open) + (substatement-open after) + (block-close . c-snug-do-while))) + (c-cleanup-list . (brace-else-brace)) + (c-offsets-alist . ((statement-block-intro . +) + (knr-argdecl-intro . 0) + (substatement-open . 0) + (label . 0) + (statement-cont . +) + )) + ) + ("python" + (indent-tabs-mode . t) + (fill-column . 72) + (c-basic-offset . 8) + (c-offsets-alist . ((substatement-open . 0) + )) + (c-hanging-braces-alist . ((brace-list-open) + (brace-list-intro) + (brace-list-close) + (substatement-open after) + (block-close . c-snug-do-while) + )) + ) + ("java" + (c-basic-offset . 2) + (c-comment-only-line-offset . (0 . 0)) + (c-offsets-alist . ((topmost-intro-cont . +) + (statement-block-intro . +) + (knr-argdecl-intro . 5) + (substatement-open . +) + (label . 0) + (statement-case-open . +) + (statement-cont . +) + (arglist-intro . c-lineup-arglist-intro-after-paren) + (arglist-close . c-lineup-arglist) + (access-label . 0) + (inher-cont . c-lineup-java-inher) + (func-decl-cont . c-lineup-java-throws) + )) + + ) + ) + "Styles of indentation. +Elements of this alist are of the form: + + (STYLE-STRING [BASE-STYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...]) + +where STYLE-STRING is a short descriptive string used to select a +style, VARIABLE is any Emacs variable, and VALUE is the intended value +for that variable when using the selected style. + +Optional BASE-STYLE if present, is a string and must follow +STYLE-STRING. BASE-STYLE names a style that this style inherits from. +By default, all styles inherit from the \"cc-mode\" style, which is +computed at run time. Style loops generate errors. + +Two variables are treated specially. When VARIABLE is +`c-offsets-alist', the VALUE is a list containing elements of the +form: + + (SYNTACTIC-SYMBOL . OFFSET) + +as described in `c-offsets-alist'. These are passed directly to +`c-set-offset' so there is no need to set every syntactic symbol in +your style, only those that are different from the default. + +When VARIABLE is `c-special-indent-hook', its VALUE is added to +`c-special-indent-hook' using `add-hook'. If VALUE is a list, each +element of the list is added with `add-hook'. + +Do not change this variable directly. Use the function `c-add-style' +to add new styles or modify existing styles (it is not a good idea to +modify existing styles -- you should create a new style that inherits +the existing style.") + + +;; Functions that manipulate styles +(defun c-set-style-1 (conscell) + ;; Set the style for one variable + (let ((attr (car conscell)) + (val (cdr conscell))) + (cond + ;; first special variable + ((eq attr 'c-offsets-alist) + (mapcar + (function + (lambda (langentry) + (let ((langelem (car langentry)) + (offset (cdr langentry))) + (c-set-offset langelem offset) + ))) + val)) + ;; second special variable + ((eq attr 'c-special-indent-hook) + (if (listp val) + (while val + (add-hook 'c-special-indent-hook (car val)) + (setq val (cdr val))) + (add-hook 'c-special-indent-hook val))) + ;; all other variables + (t (set attr val))) + )) + +(defun c-set-style-2 (style basestyles) + ;; Recursively set the base style. If no base style is given, the + ;; default base style is "cc-mode" and the recursion stops. Be sure + ;; to detect loops. + (if (not (string-equal style "cc-mode")) + (let ((base (if (stringp (car basestyles)) + (downcase (car basestyles)) + "cc-mode"))) + (if (memq base basestyles) + (error "Style loop detected: %s in %s" base basestyles)) + (c-set-style-2 base (cons base basestyles)))) + (let ((vars (cdr (or (assoc (downcase style) c-style-alist) + (assoc (upcase style) c-style-alist) + (assoc style c-style-alist) + (error "Undefined style: %s" style))))) + (mapcar 'c-set-style-1 vars))) + +(defvar c-set-style-history nil) + +;;;###autoload +(defun c-set-style (stylename) + "Set CC Mode variables to use one of several different indentation styles. +STYLENAME is a string representing the desired style from the list of +styles described in the variable `c-style-alist'. See that variable +for details of setting up styles. + +The variable `c-indentation-style' always contains the buffer's current +style name." + (interactive (list (let ((completion-ignore-case t) + (prompt (format "Which %s indentation style? " + mode-name))) + (completing-read prompt c-style-alist nil t + (cons c-indentation-style 0) + 'c-set-style-history)))) + (c-set-style-2 stylename nil) + (setq c-indentation-style stylename) + (c-keep-region-active)) + +;;;###autoload +(defun c-add-style (style descrip &optional set-p) + "Adds a style to `c-style-alist', or updates an existing one. +STYLE is a string identifying the style to add or update. DESCRIP is +an association list describing the style and must be of the form: + + ([BASESTYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...]) + +See the variable `c-style-alist' for the semantics of BASESTYLE, +VARIABLE and VALUE. This function also sets the current style to +STYLE using `c-set-style' if the optional SET-P flag is non-nil." + (interactive + (let ((stylename (completing-read "Style to add: " c-style-alist + nil nil nil 'c-set-style-history)) + (description (eval-minibuffer "Style description: "))) + (list stylename description + (y-or-n-p "Set the style too? ")))) + (setq style (downcase style)) + (let ((s (assoc style c-style-alist))) + (if s + (setcdr s (copy-alist descrip)) ; replace + (setq c-style-alist (cons (cons style descrip) c-style-alist)))) + (and set-p (c-set-style style))) + + + +(defconst c-offsets-alist + '((string . -1000) + (c . c-lineup-C-comments) + (defun-open . 0) + (defun-close . 0) + (defun-block-intro . +) + (class-open . 0) + (class-close . 0) + (inline-open . +) + (inline-close . 0) + (func-decl-cont . +) + (knr-argdecl-intro . +) + (knr-argdecl . 0) + (topmost-intro . 0) + (topmost-intro-cont . 0) + (member-init-intro . +) + (member-init-cont . 0) + (inher-intro . +) + (inher-cont . c-lineup-multi-inher) + (block-open . 0) + (block-close . 0) + (brace-list-open . 0) + (brace-list-close . 0) + (brace-list-intro . +) + (brace-list-entry . 0) + (statement . 0) + ;; some people might prefer + ;;(statement . c-lineup-runin-statements) + (statement-cont . +) + ;; some people might prefer + ;;(statement-cont . c-lineup-math) + (statement-block-intro . +) + (statement-case-intro . +) + (statement-case-open . 0) + (substatement . +) + (substatement-open . +) + (case-label . 0) + (access-label . -) + (label . 2) + (do-while-closure . 0) + (else-clause . 0) + (comment-intro . c-lineup-comment) + (arglist-intro . +) + (arglist-cont . 0) + (arglist-cont-nonempty . c-lineup-arglist) + (arglist-close . +) + (stream-op . c-lineup-streamop) + (inclass . +) + (cpp-macro . -1000) + (friend . 0) + (objc-method-intro . -1000) + (objc-method-args-cont . c-lineup-ObjC-method-args) + (objc-method-call-cont . c-lineup-ObjC-method-call) + (extern-lang-open . 0) + (extern-lang-close . 0) + (inextern-lang . +) + ) + "Association list of syntactic element symbols and indentation offsets. +As described below, each cons cell in this list has the form: + + (SYNTACTIC-SYMBOL . OFFSET) + +When a line is indented, CC Mode first determines the syntactic +context of the line by generating a list of symbols called syntactic +elements. This list can contain more than one syntactic element and +the global variable `c-syntactic-context' contains the context list +for the line being indented. Each element in this list is actually a +cons cell of the syntactic symbol and a buffer position. This buffer +position is called the relative indent point for the line. Some +syntactic symbols may not have a relative indent point associated with +them. + +After the syntactic context list for a line is generated, CC Mode +calculates the absolute indentation for the line by looking at each +syntactic element in the list. First, it compares the syntactic +element against the SYNTACTIC-SYMBOL's in `c-offsets-alist'. When it +finds a match, it adds the OFFSET to the column of the relative indent +point. The sum of this calculation for each element in the syntactic +list is the absolute offset for line being indented. + +If the syntactic element does not match any in the `c-offsets-alist', +an error is generated if `c-strict-syntax-p' is non-nil, otherwise the +element is ignored. + +Actually, OFFSET can be an integer, a function, a variable, or one of +the following symbols: `+', `-', `++', `--', `*', or `/'. These +latter designate positive or negative multiples of `c-basic-offset', +respectively: 1, -1, 2, -2, 0.5, and -0.5. If OFFSET is a function, it +is called with a single argument containing the cons of the syntactic +element symbol and the relative indent point. The function should +return an integer offset. + +Here is the current list of valid syntactic element symbols: + + string -- inside multi-line string + c -- inside a multi-line C style block comment + defun-open -- brace that opens a function definition + defun-close -- brace that closes a function definition + defun-block-intro -- the first line in a top-level defun + class-open -- brace that opens a class definition + class-close -- brace that closes a class definition + inline-open -- brace that opens an in-class inline method + inline-close -- brace that closes an in-class inline method + func-decl-cont -- the region between a function definition's + argument list and the function opening brace + (excluding K&R argument declarations). In C, you + cannot put anything but whitespace and comments + between them; in C++ and Java, throws declarations + and other things can appear in this context. + knr-argdecl-intro -- first line of a K&R C argument declaration + knr-argdecl -- subsequent lines in a K&R C argument declaration + topmost-intro -- the first line in a topmost construct definition + topmost-intro-cont -- topmost definition continuation lines + member-init-intro -- first line in a member initialization list + member-init-cont -- subsequent member initialization list lines + inher-intro -- first line of a multiple inheritance list + inher-cont -- subsequent multiple inheritance lines + block-open -- statement block open brace + block-close -- statement block close brace + brace-list-open -- open brace of an enum or static array list + brace-list-close -- close brace of an enum or static array list + brace-list-intro -- first line in an enum or static array list + brace-list-entry -- subsequent lines in an enum or static array list + statement -- a C (or like) statement + statement-cont -- a continuation of a C (or like) statement + statement-block-intro -- the first line in a new statement block + statement-case-intro -- the first line in a case \"block\" + statement-case-open -- the first line in a case block starting with brace + substatement -- the first line after an if/while/for/do/else + substatement-open -- the brace that opens a substatement block + case-label -- a `case' or `default' label + access-label -- C++ private/protected/public access label + label -- any ordinary label + do-while-closure -- the `while' that ends a do/while construct + else-clause -- the `else' of an if/else construct + comment-intro -- a line containing only a comment introduction + arglist-intro -- the first line in an argument list + arglist-cont -- subsequent argument list lines when no + arguments follow on the same line as the + arglist opening paren + arglist-cont-nonempty -- subsequent argument list lines when at + least one argument follows on the same + line as the arglist opening paren + arglist-close -- the solo close paren of an argument list + stream-op -- lines continuing a stream operator construct + inclass -- the construct is nested inside a class definition + cpp-macro -- the start of a cpp macro + friend -- a C++ friend declaration + objc-method-intro -- the first line of an Objective-C method definition + objc-method-args-cont -- lines continuing an Objective-C method definition + objc-method-call-cont -- lines continuing an Objective-C method call + extern-lang-open -- brace that opens an external language block + extern-lang-close -- brace that closes an external language block + inextern-lang -- analogous to `inclass' syntactic symbol +") + +(defun c-get-offset (langelem) + ;; Get offset from LANGELEM which is a cons cell of the form: + ;; (SYMBOL . RELPOS). The symbol is matched against + ;; c-offsets-alist and the offset found there is either returned, + ;; or added to the indentation at RELPOS. If RELPOS is nil, then + ;; the offset is simply returned. + (let* ((symbol (car langelem)) + (relpos (cdr langelem)) + (match (assq symbol c-offsets-alist)) + (offset (cdr-safe match))) + ;; offset can be a number, a function, a variable, or one of the + ;; symbols + or - + (cond + ((not match) + (if c-strict-syntax-p + (error "don't know how to indent a %s" symbol) + (setq offset 0 + relpos 0))) + ((eq offset '+) (setq offset c-basic-offset)) + ((eq offset '-) (setq offset (- c-basic-offset))) + ((eq offset '++) (setq offset (* 2 c-basic-offset))) + ((eq offset '--) (setq offset (* 2 (- c-basic-offset)))) + ((eq offset '*) (setq offset (/ c-basic-offset 2))) + ((eq offset '/) (setq offset (/ (- c-basic-offset) 2))) + ((functionp offset) (setq offset (funcall offset langelem))) + ((not (numberp offset)) (setq offset (symbol-value offset))) + ) + (+ (if (and relpos + (< relpos (c-point 'bol))) + (save-excursion + (goto-char relpos) + (current-column)) + 0) + offset))) + + +(defvar c-read-offset-history nil) + +(defun c-read-offset (langelem) + ;; read new offset value for LANGELEM from minibuffer. return a + ;; legal value only + (let* ((oldoff (cdr-safe (assq langelem c-offsets-alist))) + (defstr (format "(default %s): " oldoff)) + (errmsg (concat "Offset must be int, func, var, " + "or in [+,-,++,--,*,/] " + defstr)) + (prompt (concat "Offset " defstr)) + offset input interned raw) + (while (not offset) + (setq input (completing-read prompt obarray 'fboundp nil nil + 'c-read-offset-history) + offset (cond ((string-equal "" input) oldoff) ; default + ((string-equal "+" input) '+) + ((string-equal "-" input) '-) + ((string-equal "++" input) '++) + ((string-equal "--" input) '--) + ((string-equal "*" input) '*) + ((string-equal "/" input) '/) + ((string-match "^-?[0-9]+$" input) + (string-to-int input)) + ;; a symbol with a function binding + ((fboundp (setq interned (intern input))) + interned) + ;; a lambda function + ((c-safe (functionp (setq raw (read input)))) + raw) + ;; a symbol with variable binding + ((boundp interned) interned) + ;; error, but don't signal one, keep trying + ;; to read an input value + (t (ding) + (setq prompt errmsg) + nil)))) + offset)) + +(defun c-set-offset (symbol offset &optional add-p) + "Change the value of a syntactic element symbol in `c-offsets-alist'. +SYMBOL is the syntactic element symbol to change and OFFSET is the new +offset for that syntactic element. Optional ADD says to add SYMBOL to +`c-offsets-alist' if it doesn't already appear there." + (interactive + (let* ((langelem + (intern (completing-read + (concat "Syntactic symbol to change" + (if current-prefix-arg " or add" "") + ": ") + (mapcar + #'(lambda (langelem) + (cons (format "%s" (car langelem)) nil)) + c-offsets-alist) + nil (not current-prefix-arg) + ;; initial contents tries to be the last element + ;; on the syntactic analysis list for the current + ;; line + (let* ((syntax (c-guess-basic-syntax)) + (len (length syntax)) + (ic (format "%s" (car (nth (1- len) syntax))))) + (cons ic 0)) + ))) + (offset (c-read-offset langelem))) + (list langelem offset current-prefix-arg))) + ;; sanity check offset + (or (eq offset '+) + (eq offset '-) + (eq offset '++) + (eq offset '--) + (eq offset '*) + (eq offset '/) + (integerp offset) + (functionp offset) + (boundp offset) + (error "Offset must be int, func, var, or in [+,-,++,--,*,/]: %s" + offset)) + (let ((entry (assq symbol c-offsets-alist))) + (if entry + (setcdr entry offset) + (if add-p + (setq c-offsets-alist (cons (cons symbol offset) c-offsets-alist)) + (error "%s is not a valid syntactic symbol." symbol)))) + (c-keep-region-active)) + + + +;; Dynamically append the default value of most variables. This is +;; crucial because future c-set-style calls will always reset the +;; variables first to the `cc-mode' style before instituting the new +;; style. Only do this once! +(or (assoc "cc-mode" c-style-alist) + (progn + (c-add-style "cc-mode" + (mapcar + (function + (lambda (var) + (let ((val (symbol-value var))) + (cons var (if (atom val) val + (copy-tree val) + )) + ))) + '(c-backslash-column + c-basic-offset + c-cleanup-list + c-comment-only-line-offset + c-electric-pound-behavior + c-hanging-braces-alist + c-hanging-colons-alist + c-hanging-comment-starter-p + c-hanging-comment-ender-p + c-offsets-alist + ))) + ;; the default style is now GNU. This can be overridden in + ;; c-mode-common-hook or {c,c++,objc,java}-mode-hook. + (c-set-style c-site-default-style))) + +(defun c-make-styles-buffer-local () + "Make all CC Mode style variables buffer local. +If you edit primarily one style of C (or C++, Objective-C, Java) code, +you probably want style variables to be global. This is the default. + +If you edit many different styles of C (or C++, Objective-C, Java) at +the same time, you probably want the CC Mode style variables to be +buffer local. If you do, then you will need to set any CC Mode style +variables in a hook function (e.g. off of c-mode-common-hook), instead +of at the top level of your ~/.emacs file. + +This function makes all the CC Mode style variables buffer local. +Call it after CC Mode is loaded into your Emacs environment. +Conversely, set the variable `c-style-variables-are-local-p' to t in +your .emacs file, before CC Mode is loaded, and this function will be +automatically called when CC Mode is loaded." + ;; style variables + (make-variable-buffer-local 'c-offsets-alist) + (make-variable-buffer-local 'c-basic-offset) + (make-variable-buffer-local 'c-file-style) + (make-variable-buffer-local 'c-file-offsets) + (make-variable-buffer-local 'c-comment-only-line-offset) + (make-variable-buffer-local 'c-cleanup-list) + (make-variable-buffer-local 'c-hanging-braces-alist) + (make-variable-buffer-local 'c-hanging-colons-alist) + (make-variable-buffer-local 'c-hanging-comment-starter-p) + (make-variable-buffer-local 'c-hanging-comment-ender-p) + (make-variable-buffer-local 'c-backslash-column) + (make-variable-buffer-local 'c-label-minimum-indentation) + (make-variable-buffer-local 'c-special-indent-hook) + (make-variable-buffer-local 'c-indentation-style)) + +(if c-style-variables-are-local-p + (c-make-styles-buffer-local)) + + + +(provide 'cc-styles) +;;; cc-styles.el ends here