Mercurial > hg > xemacs-beta
diff lisp/modes/old-c-mode.el @ 0:376386a54a3c r19-14
Import from CVS: tag r19-14
author | cvs |
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date | Mon, 13 Aug 2007 08:45:50 +0200 |
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children | 0293115a14e9 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/lisp/modes/old-c-mode.el Mon Aug 13 08:45:50 2007 +0200 @@ -0,0 +1,1681 @@ +;;; c-mode.el --- C code editing commands for Emacs +;; Copyright (C) 1985, 86, 87, 92, 94, 95 Free Software Foundation, Inc. + +;; Maintainer: FSF +;; Keywords: c + +;; This file is part of XEmacs. + +;; XEmacs 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. + +;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the Free +;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + +;;; Synched up with: FSF 19.30. + +;;; Commentary: + +;; A smart editing mode for C code. It knows a lot about C syntax and tries +;; to position the cursor according to C layout conventions. You can +;; change the details of the layout style with option variables. Load it +;; and do M-x describe-mode for details. + +;;; Code: + +(defvar c-mode-abbrev-table nil + "Abbrev table in use in C mode.") +(define-abbrev-table 'c-mode-abbrev-table ()) + +(defvar c-mode-map () + "Keymap used in C mode.") +;; XEmacs change: if cc-mode is loaded, then override its keymap. +;; otherwise things will be really screwed up. +(if (or (null c-mode-map) (featurep 'cc-mode)) + (progn + (setq c-mode-map (make-sparse-keymap)) + (set-keymap-name c-mode-map 'c-mode-map) + (define-key c-mode-map "{" 'electric-c-brace) + (define-key c-mode-map "}" 'electric-c-brace) + (define-key c-mode-map ";" 'electric-c-semi) + (define-key c-mode-map "#" 'electric-c-sharp-sign) + (define-key c-mode-map ":" 'electric-c-terminator) + (define-key c-mode-map "\e{" 'c-insert-braces) + ;; Commented out electric square brackets because nobody likes them. + ;;(define-key c-mode-map "[" 'c-insert-brackets) + (define-key c-mode-map "\e\C-h" 'mark-c-function) + (define-key c-mode-map "\e\C-q" 'indent-c-exp) + (define-key c-mode-map "\ea" 'c-beginning-of-statement) + (define-key c-mode-map "\ee" 'c-end-of-statement) + (define-key c-mode-map "\C-c\C-n" 'c-forward-conditional) + (define-key c-mode-map "\C-c\C-p" 'c-backward-conditional) + (define-key c-mode-map "\C-c\C-u" 'c-up-conditional) + (define-key c-mode-map "\177" 'backward-delete-char-untabify) + (define-key c-mode-map "\t" 'c-indent-command))) + +(defvar c-mode-popup-menu + (purecopy '("C Menu" + ["Comment Out Region" comment-region (region-exists-p)] + ["Macro Expand Region" c-macro-expand (region-exists-p)] + ["Backslashify" c-backslash-region (region-exists-p)] + "---" + ["Indent Expression" indent-c-exp t] + ["Indent Line" c-indent-command t] + ["Fill Comment Paragraph" c-fill-paragraph t] + "---" + ["Highlight Conditionals" cpp-highlight-buffer t] + ["Up Conditional" c-up-conditional t] + ["Backward Conditional" c-backward-conditional t] + ["Forward Conditional" c-forward-conditional t] + "---" + ["Backward Statement" c-beginning-of-statement t] + ["Forward Statement" c-end-of-statement t] + ))) + +(defvar c-mode-menubar-menu + (purecopy (cons "C" (cdr c-mode-popup-menu)))) + +;; cmacexp is lame because it uses no preprocessor symbols. +;; It isn't very extensible either -- hardcodes /lib/cpp. +(autoload 'c-macro-expand "cmacexp" + "Display the result of expanding all C macros occurring in the region. +The expansion is entirely correct because it uses the C preprocessor." + t) + +(defvar c-mode-syntax-table nil + "Syntax table in use in C-mode buffers.") + +(if c-mode-syntax-table + () + (setq c-mode-syntax-table (make-syntax-table)) + (modify-syntax-entry ?\\ "\\" c-mode-syntax-table) + (modify-syntax-entry ?/ ". 14" c-mode-syntax-table) + (modify-syntax-entry ?* ". 23" c-mode-syntax-table) + (modify-syntax-entry ?+ "." c-mode-syntax-table) + (modify-syntax-entry ?- "." c-mode-syntax-table) + (modify-syntax-entry ?= "." c-mode-syntax-table) + (modify-syntax-entry ?% "." c-mode-syntax-table) + (modify-syntax-entry ?< "." c-mode-syntax-table) + (modify-syntax-entry ?> "." c-mode-syntax-table) + (modify-syntax-entry ?& "." c-mode-syntax-table) + (modify-syntax-entry ?| "." c-mode-syntax-table) + (modify-syntax-entry ?\' "\"" c-mode-syntax-table)) + +(defvar c-indent-level 2 + "*Indentation of C statements with respect to containing block.") +(defvar c-brace-imaginary-offset 0 + "*Imagined indentation of a C open brace that actually follows a statement.") +(defvar c-brace-offset 0 + "*Extra indentation for braces, compared with other text in same context.") +(defvar c-argdecl-indent 5 + "*Indentation level of declarations of C function arguments.") +(defvar c-label-offset -2 + "*Offset of C label lines and case statements relative to usual indentation.") +(defvar c-continued-statement-offset 2 + "*Extra indent for lines not starting new statements.") +(defvar c-continued-brace-offset 0 + "*Extra indent for substatements that start with open-braces. +This is in addition to `c-continued-statement-offset'.") +(defconst c-style-alist + '(("GNU" + (c-indent-level . 2) + (c-argdecl-indent . 5) + (c-brace-offset . 0) + (c-continued-brace-offset . 0) + (c-label-offset . -2) + (c-continued-statement-offset . 2)) + ("K&R" + (c-indent-level . 5) + (c-argdecl-indent . 0) + (c-brace-offset . 0) + (c-continued-brace-offset . -5) + (c-label-offset . -5) + (c-continued-statement-offset . 5)) + ("BSD" + (c-indent-level . 4) + (c-argdecl-indent . 4) + (c-brace-offset . 0) + (c-continued-brace-offset . -4) + (c-label-offset . -4) + (c-continued-statement-offset . 4)) + ("C++" + (c-indent-level . 4) + (c-argdecl-indent . 0) + (c-brace-offset . 0) + (c-continued-brace-offset . -4) + (c-label-offset . -4) + (c-continued-statement-offset . 4) + (c-auto-newline . t)) + ("Whitesmith" + (c-indent-level . 4) + (c-argdecl-indent . 4) + (c-brace-offset . 0) + (c-continued-brace-offset . 0) + (c-label-offset . -4) + (c-continued-statement-offset . 4)))) + +(defvar c-auto-newline nil + "*Non-nil means automatically newline before and after braces, +and after colons and semicolons, inserted in C code. +If you do not want a leading newline before braces then use: + (define-key c-mode-map \"{\" 'electric-c-semi)") + +(defvar c-tab-always-indent t + "*Non-nil means TAB in C mode should always reindent the current line, +regardless of where in the line point is when the TAB command is used.") + +;;; Regular expression used internally to recognize labels in switch +;;; statements. +(defvar c-switch-label-regexp (purecopy "case[ \t'/(]\\|default[ \t]*:")) + +;;; This is actually the expression for C++ mode, but it's used for C too. +;(defvar c-imenu-generic-expression +; (` +; ((nil +; (, +; (concat +; "^" ; beginning of line is required +; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" +; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no +; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right? +; +; "\\(" ; last type spec including */& +; "[a-zA-Z0-9_:]+" +; "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace +; "\\)?" ; if there is a last type spec +; "\\(" ; name; take that into the imenu entry +; "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor... +; ; (may not contain * because then +; ; "a::operator char*" would become "char*"!) +; "\\|" +; "\\([a-zA-Z0-9_:~]*::\\)?operator" +; "[^a-zA-Z1-9_][^(]*" ; ...or operator +; " \\)" +; "[ \t]*([^)]*)[ \t\n]*[^ ;]" ; require something other than a ; after +; ; the (...) to avoid prototypes. Can't +; ; catch cases with () inside the parentheses +; ; surrounding the parameters +; ; (like "int foo(int a=bar()) {...}" +; +; )) 6) +; ("Class" +; (, (concat +; "^" ; beginning of line is required +; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" +; "class[ \t]+" +; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get +; "[ \t]*[:{]" +; )) 2) +;;; Example of generic expression for finding prototypes, structs, unions, enums. +;;; Uncomment if you want to find these too. It will be a bit slower gathering +;;; the indexes. +;; ("Prototypes" +;; (, +;; (concat +;; "^" ; beginning of line is required +;; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" +;; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no +;; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right? +; +;; "\\(" ; last type spec including */& +;; "[a-zA-Z0-9_:]+" +;; "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace +;; "\\)?" ; if there is a last type spec +;; "\\(" ; name; take that into the imenu entry +;; "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor... +;; ; (may not contain * because then +;; ; "a::operator char*" would become "char*"!) +;; "\\|" +;; "\\([a-zA-Z0-9_:~]*::\\)?operator" +;; "[^a-zA-Z1-9_][^(]*" ; ...or operator +;; " \\)" +;; "[ \t]*([^)]*)[ \t\n]*;" ; require ';' after +;; ; the (...) Can't +;; ; catch cases with () inside the parentheses +;; ; surrounding the parameters +;; ; (like "int foo(int a=bar());" +;; )) 6) +;; ("Struct" +;; (, (concat +;; "^" ; beginning of line is required +;; "\\(static[ \t]+\\)?" ; there may be static or const. +;; "\\(const[ \t]+\\)?" +;; "struct[ \t]+" +;; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get +;; "[ \t]*[{]" +;; )) 3) +;; ("Enum" +;; (, (concat +;; "^" ; beginning of line is required +;; "\\(static[ \t]+\\)?" ; there may be static or const. +;; "\\(const[ \t]+\\)?" +;; "enum[ \t]+" +;; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get +;; "[ \t]*[{]" +;; )) 3) +;; ("Union" +;; (, (concat +;; "^" ; beginning of line is required +;; "\\(static[ \t]+\\)?" ; there may be static or const. +;; "\\(const[ \t]+\\)?" +;; "union[ \t]+" +;; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get +;; "[ \t]*[{]" +;; )) 3) +; )) +; "Imenu generic expression for C mode. See `imenu-generic-expression'.") + +(defun c-mode () + "Major mode for editing C code. +Expression and list commands understand all C brackets. +Tab indents for C code. +Comments are delimited with /* ... */. +Paragraphs are separated by blank lines only. +Delete converts tabs to spaces as it moves back. +\\{c-mode-map} +Variables controlling indentation style: + c-tab-always-indent + Non-nil means TAB in C mode should always reindent the current line, + regardless of where in the line point is when the TAB command is used. + c-auto-newline + Non-nil means automatically newline before and after braces, + and after colons and semicolons, inserted in C code. + c-indent-level + Indentation of C statements within surrounding block. + The surrounding block's indentation is the indentation + of the line on which the open-brace appears. + c-continued-statement-offset + Extra indentation given to a substatement, such as the + then-clause of an if or body of a while. + c-continued-brace-offset + Extra indentation given to a brace that starts a substatement. + This is in addition to c-continued-statement-offset. + c-brace-offset + Extra indentation for line if it starts with an open brace. + c-brace-imaginary-offset + An open brace following other text is treated as if it were + this far to the right of the start of its line. + c-argdecl-indent + Indentation level of declarations of C function arguments. + c-label-offset + Extra indentation for line that is a label, or case or default. + +Settings for K&R and BSD indentation styles are + c-indent-level 5 8 + c-continued-statement-offset 5 8 + c-brace-offset -5 -8 + c-argdecl-indent 0 8 + c-label-offset -5 -8 + +Turning on C mode calls the value of the variable c-mode-hook with no args, +if that value is non-nil." + (interactive) + (kill-all-local-variables) + (use-local-map c-mode-map) + (setq major-mode 'c-mode) + (setq mode-popup-menu c-mode-popup-menu) + (setq mode-name "C") + (setq local-abbrev-table c-mode-abbrev-table) + (set-syntax-table c-mode-syntax-table) + (make-local-variable 'paragraph-start) + (setq paragraph-start (concat "$\\|" page-delimiter)) + (make-local-variable 'paragraph-separate) + (setq paragraph-separate paragraph-start) + (make-local-variable 'paragraph-ignore-fill-prefix) + (setq paragraph-ignore-fill-prefix t) + (make-local-variable 'fill-paragraph-function) + (setq fill-paragraph-function 'c-fill-paragraph) + (make-local-variable 'indent-line-function) + (setq indent-line-function 'c-indent-line) + (make-local-variable 'indent-region-function) + (setq indent-region-function 'c-indent-region) + (make-local-variable 'require-final-newline) + (setq require-final-newline t) + (make-local-variable 'outline-regexp) + (setq outline-regexp "[^#\n\^M]") + (make-local-variable 'outline-level) + (setq outline-level 'c-outline-level) + (make-local-variable 'comment-start) + (setq comment-start "/* ") + (make-local-variable 'comment-end) + (setq comment-end " */") + (make-local-variable 'comment-column) + (setq comment-column 32) + (make-local-variable 'comment-start-skip) + (setq comment-start-skip "/\\*+ *") + (make-local-variable 'comment-indent-function) + (setq comment-indent-function 'c-comment-indent) + (make-local-variable 'comment-multi-line) + (setq comment-multi-line t) + (make-local-variable 'parse-sexp-ignore-comments) + (setq parse-sexp-ignore-comments t) + (if (featurep 'menubar) + (progn + ;; make a local copy of the menubar, so our modes don't + ;; change the global menubar + (set-buffer-menubar current-menubar) + (add-submenu nil c-mode-menubar-menu))) +; (make-local-variable 'imenu-generic-expression) +; (setq imenu-generic-expression c-imenu-generic-expression) + (run-hooks 'c-mode-hook)) + +(defun c-outline-level () + (save-excursion + (skip-chars-forward "\t ") + (current-column))) +^L +;; This is used by indent-for-comment +;; to decide how much to indent a comment in C code +;; based on its context. +(defun c-comment-indent () + (if (looking-at "^/\\*") + 0 ;Existing comment at bol stays there. + (let ((opoint (point))) + (save-excursion + (beginning-of-line) + (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)") + ;; A comment following a solitary close-brace + ;; should have only one space. + (search-forward "}") + (1+ (current-column))) + ((or (looking-at "^#[ \t]*endif[ \t]*") + (looking-at "^#[ \t]*else[ \t]*")) + 7) ;2 spaces after #endif + ((progn + (goto-char opoint) + (skip-chars-backward " \t") + (and (= comment-column 0) (bolp))) + ;; If comment-column is 0, and nothing but space + ;; before the comment, align it at 0 rather than 1. + 0) + (t + (max (1+ (current-column)) ;Else indent at comment column + comment-column))))))) ; except leave at least one space. + +(defun c-fill-paragraph (&optional arg) + "Like \\[fill-paragraph] but handle C comments. +If any of the current line is a comment or within a comment, +fill the comment or the paragraph of it that point is in, +preserving the comment indentation or line-starting decorations." + (interactive "P") + (let* (comment-start-place + (first-line + ;; Check for obvious entry to comment. + (save-excursion + (beginning-of-line) + (skip-chars-forward " \t\n") + (and (looking-at comment-start-skip) + (setq comment-start-place (point)))))) + (if (and (eq major-mode 'c++-mode) + (save-excursion + (beginning-of-line) + (looking-at ".*//"))) + (let (fill-prefix + (paragraph-start + ;; Lines containing just a comment start or just an end + ;; should not be filled into paragraphs they are next to. + (concat + paragraph-start + "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) + (paragraph-separate + (concat + paragraph-separate + "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))) + (save-excursion + (beginning-of-line) + ;; Move up to first line of this comment. + (while (and (not (bobp)) (looking-at "[ \t]*//")) + (forward-line -1)) + (if (not (looking-at ".*//")) + (forward-line 1)) + ;; Find the comment start in this line. + (re-search-forward "[ \t]*//[ \t]*") + ;; Set the fill-prefix to be what all lines except the first + ;; should start with. + (let ((endcol (current-column))) + (skip-chars-backward " \t") + (setq fill-prefix + (concat (make-string (- (current-column) 2) ?\ ) + "//" + (make-string (- endcol (current-column)) ?\ )))) + (save-restriction + ;; Narrow down to just the lines of this comment. + (narrow-to-region (point) + (save-excursion + (forward-line 1) + (while (looking-at "[ \t]*//") + (forward-line 1)) + (point))) + (insert fill-prefix) + (fill-paragraph arg) + (delete-region (point-min) + (+ (point-min) (length fill-prefix)))))) + (if (or first-line + ;; t if we enter a comment between start of function and this line. + (eq (calculate-c-indent) t) + ;; t if this line contains a comment starter. + (setq first-line + (save-excursion + (beginning-of-line) + (prog1 + (re-search-forward comment-start-skip + (save-excursion (end-of-line) + (point)) + t) + (setq comment-start-place (point)))))) + ;; Inside a comment: fill one comment paragraph. + (let ((fill-prefix + ;; The prefix for each line of this paragraph + ;; is the appropriate part of the start of this line, + ;; up to the column at which text should be indented. + (save-excursion + (beginning-of-line) + (if (looking-at "[ \t]*/\\*.*\\*/") + (progn (re-search-forward comment-start-skip) + (make-string (current-column) ?\ )) + (if first-line (forward-line 1)) + + (let ((line-width (progn (end-of-line) (current-column)))) + (beginning-of-line) + (prog1 + (buffer-substring + (point) + + ;; How shall we decide where the end of the + ;; fill-prefix is? + ;; calculate-c-indent-within-comment bases its value + ;; on the indentation of previous lines; if they're + ;; indented specially, it could return a column + ;; that's well into the current line's text. So + ;; we'll take at most that many space, tab, or * + ;; characters, and use that as our fill prefix. + (let ((max-prefix-end + (progn + (move-to-column + (calculate-c-indent-within-comment t) + t) + (point)))) + (beginning-of-line) + (skip-chars-forward " \t*" max-prefix-end) + ;; Don't include part of comment terminator + ;; in the fill-prefix. + (and (eq (following-char) ?/) + (eq (preceding-char) ?*) + (backward-char 1)) + (point))) + + ;; If the comment is only one line followed by a blank + ;; line, calling move-to-column above may have added + ;; some spaces and tabs to the end of the line; the + ;; fill-paragraph function will then delete it and the + ;; newline following it, so we'll lose a blank line + ;; when we shouldn't. So delete anything + ;; move-to-column added to the end of the line. We + ;; record the line width instead of the position of the + ;; old line end because move-to-column might break a + ;; tab into spaces, and the new characters introduced + ;; there shouldn't be deleted. + + ;; If you can see a better way to do this, please make + ;; the change. This seems very messy to me. + (delete-region (progn (move-to-column line-width) + (point)) + (progn (end-of-line) (point)))))))) + (paragraph-start + ;; Lines containing just a comment start or just an end + ;; should not be filled into paragraphs they are next to. + (concat paragraph-start + ;; This: + ;; "\\|[ \t]*/\\*[ \t]*$" + ;; "\\|[ \t]*\\*/[ \t]*$" + ;; "\\|[ \t/*]*$" + ;; is just this: + "\\|[ \t/*]*$")) + (paragraph-separate + (concat paragraph-separate + ;; This: + ;; "\\|[ \t]*/\\*[ \t]*$" + ;; "\\|[ \t]*\\*/[ \t]*$" + ;; "\\|[ \t/*]*$" + ;; is just this: + "\\|[ \t/*]*$")) + (chars-to-delete 0)) + (save-restriction + ;; Don't fill the comment together with the code following it. + ;; So temporarily exclude everything before the comment start, + ;; and everything after the line where the comment ends. + ;; If comment-start-place is non-nil, the comment starter is there. + ;; Otherwise, point is inside the comment. + (narrow-to-region (save-excursion + (if comment-start-place + (goto-char comment-start-place) + (search-backward "/*")) + ;; Protect text before the comment start + ;; by excluding it. Add spaces to bring back + ;; proper indentation of that point. + (let ((column (current-column))) + (prog1 (point) + (setq chars-to-delete column) + (insert-char ?\ column)))) + (save-excursion + (if comment-start-place + (goto-char (+ comment-start-place 2))) + (search-forward "*/" nil 'move) + (forward-line 1) + (point))) + (save-excursion + (goto-char (point-max)) + (forward-line -1) + ;; And comment terminator was on a separate line before, + ;; keep it that way. + ;; This also avoids another problem: + ;; if the fill-prefix ends in a *, it could eat up + ;; the * of the comment terminator. + (if (looking-at "[ \t]*\\*/") + (narrow-to-region (point-min) (point)))) + (fill-paragraph arg) + (save-excursion + ;; Delete the chars we inserted to avoid clobbering + ;; the stuff before the comment start. + (goto-char (point-min)) + (if (> chars-to-delete 0) + (delete-region (point) (+ (point) chars-to-delete))) + ;; Find the comment ender (should be on last line of buffer, + ;; given the narrowing) and don't leave it on its own line. + ;; Do this with a fill command, so as to preserve sentence + ;; boundaries. + (goto-char (point-max)) + (forward-line -1) + (search-forward "*/" nil 'move) + (beginning-of-line) + (if (looking-at "[ \t]*\\*/") + (let ((fill-column (+ fill-column 9999))) + (forward-line -1) + (fill-region-as-paragraph (point) (point-max))))))) + ;; Outside of comments: do ordinary filling. + (fill-paragraph arg))) + t)) + +(defun electric-c-brace (arg) + "Insert character and correct line's indentation." + (interactive "P") + (let ((insertpos nil)) + (if (and (not arg) + (eolp) + (or (save-excursion + (skip-chars-backward " \t") + (bolp)) + (if c-auto-newline (progn (c-indent-line) (newline) t) nil))) + (progn + (insert last-command-char) + (c-indent-line) + (if c-auto-newline + (progn + (newline) + ;; (newline) may have done auto-fill + (setq insertpos (- (point) 2)) + (c-indent-line))) + (save-excursion + (if insertpos (goto-char (1+ insertpos))) + (delete-char -1)))) + (if insertpos + (save-excursion + (goto-char insertpos) + (self-insert-command (prefix-numeric-value arg))) + (self-insert-command (prefix-numeric-value arg))))) + +(defun c-insert-brackets () + (interactive) + (insert ?[) + (save-excursion + (insert ?]))) + +(defun c-insert-braces () + (interactive) + (setq last-command-char ?{) + (electric-c-brace 1) + (newline) + (c-indent-line) + (save-excursion + (newline) + (insert ?}) + (c-indent-line))) + +(defun electric-c-sharp-sign (arg) + "Insert character and correct line's indentation." + (interactive "P") + (if (save-excursion + (skip-chars-backward " \t") + (bolp)) + (let ((c-auto-newline nil)) + (electric-c-terminator arg)) + (self-insert-command (prefix-numeric-value arg)))) + +(defun electric-c-semi (arg) + "Insert character and correct line's indentation." + (interactive "P") + (if c-auto-newline + (electric-c-terminator arg) + (self-insert-command (prefix-numeric-value arg)))) + +(defun electric-c-terminator (arg) + "Insert character and correct line's indentation." + (interactive "P") + (let (insertpos (end (point))) + (if (and (not arg) (eolp) + (not (save-excursion + (beginning-of-line) + (skip-chars-forward " \t") + (or (= (following-char) ?#) + ;; Colon is special only after a label, or case .... + ;; So quickly rule out most other uses of colon + ;; and do no indentation for them. + (and (eq last-command-char ?:) + (not (looking-at c-switch-label-regexp)) + (save-excursion + (skip-chars-forward "a-zA-Z0-9_$") + (skip-chars-forward " \t") + (< (point) end))) + (progn + (beginning-of-defun) + (let ((pps (parse-partial-sexp (point) end))) + (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))))) + (progn + (insert last-command-char) + (c-indent-line) + (and c-auto-newline + (not (c-inside-parens-p)) + (progn + (newline) + ;; (newline) may have done auto-fill + (setq insertpos (- (point) 2)) + (c-indent-line))) + (save-excursion + (if insertpos (goto-char (1+ insertpos))) + (delete-char -1)))) + (if insertpos + (save-excursion + (goto-char insertpos) + (self-insert-command (prefix-numeric-value arg))) + (self-insert-command (prefix-numeric-value arg))))) + +(defun c-inside-parens-p () + (condition-case () + (save-excursion + (save-restriction + (narrow-to-region (point) + (progn (beginning-of-defun) (point))) + (goto-char (point-max)) + (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\())) + (error nil))) + +(defun c-indent-command (&optional whole-exp) + "Indent current line as C code, or in some cases insert a tab character. +If `c-tab-always-indent' is non-nil (the default), always indent current line. +Otherwise, indent the current line only if point is at the left margin +or in the line's indentation; otherwise insert a tab. + +A numeric argument, regardless of its value, means indent rigidly all +the lines of the expression starting after point so that this line +becomes properly indented. The relative indentation among the lines +of the expression are preserved." + (interactive "P") + (if whole-exp + ;; If arg, always indent this line as C + ;; and shift remaining lines of expression the same amount. + (let ((shift-amt (c-indent-line)) + beg end) + (save-excursion + (if c-tab-always-indent + (beginning-of-line)) + ;; Find beginning of following line. + (save-excursion + (forward-line 1) (setq beg (point))) + ;; Find first beginning-of-sexp for sexp extending past this line. + (while (< (point) beg) + (forward-sexp 1) + (setq end (point)) + (skip-chars-forward " \t\n"))) + (if (> end beg) + (indent-code-rigidly beg end shift-amt "#"))) + (if (and (not c-tab-always-indent) + (save-excursion + (skip-chars-backward " \t") + (not (bolp)))) + (insert-tab) + (c-indent-line)))) + +(defun c-indent-line () + "Indent current line as C code. +Return the amount the indentation changed by." + (let ((indent (calculate-c-indent nil)) + beg shift-amt + (case-fold-search nil) + (pos (- (point-max) (point)))) + (beginning-of-line) + (setq beg (point)) + (cond ((eq indent nil) + (setq indent (current-indentation))) + ((eq indent t) + (setq indent (calculate-c-indent-within-comment))) + ((looking-at "[ \t]*#") + (setq indent 0)) + (t + (skip-chars-forward " \t") + (if (listp indent) (setq indent (car indent))) + (cond ((or (looking-at c-switch-label-regexp) + (and (looking-at "[A-Za-z]") + (save-excursion + (forward-sexp 1) + (looking-at ":")))) + (setq indent (max 1 (+ indent c-label-offset)))) + ((and (looking-at "else\\b") + (not (looking-at "else\\s_"))) + (setq indent (save-excursion + (c-backward-to-start-of-if) + (current-indentation)))) + ((and (looking-at "}[ \t]*else\\b") + (not (looking-at "}[ \t]*else\\s_"))) + (setq indent (save-excursion + (forward-char) + (backward-sexp) + (c-backward-to-start-of-if) + (current-indentation)))) + ((and (looking-at "while\\b") + (not (looking-at "while\\s_")) + (save-excursion + (c-backward-to-start-of-do))) + ;; This is a `while' that ends a do-while. + (setq indent (save-excursion + (c-backward-to-start-of-do) + (current-indentation)))) + ((= (following-char) ?}) + (setq indent (- indent c-indent-level))) + ((= (following-char) ?{) + (setq indent (+ indent c-brace-offset)))))) + (skip-chars-forward " \t") + (setq shift-amt (- indent (current-column))) + (if (zerop shift-amt) + (if (> (- (point-max) pos) (point)) + (goto-char (- (point-max) pos))) + (delete-region beg (point)) + (indent-to indent) + ;; If initial point was within line's indentation, + ;; position after the indentation. Else stay at same point in text. + (if (> (- (point-max) pos) (point)) + (goto-char (- (point-max) pos)))) + shift-amt)) + +(defun calculate-c-indent (&optional parse-start) + "Return appropriate indentation for current line as C code. +In usual case returns an integer: the column to indent to. +Returns nil if line starts inside a string, t if in a comment." + (save-excursion + (beginning-of-line) + (let ((indent-point (point)) + (case-fold-search nil) + state + containing-sexp) + (if parse-start + (goto-char parse-start) + (beginning-of-defun)) + (while (< (point) indent-point) + (setq parse-start (point)) + (setq state (parse-partial-sexp (point) indent-point 0)) + (setq containing-sexp (car (cdr state)))) + (cond ((or (nth 3 state) (nth 4 state)) + ;; return nil or t if should not change this line + (nth 4 state)) + ((null containing-sexp) + ;; Line is at top level. May be data or function definition, + ;; or may be function argument declaration. + ;; Indent like the previous top level line + ;; unless that ends in a closeparen without semicolon, + ;; in which case this line is the first argument decl. + (goto-char indent-point) + (skip-chars-forward " \t") + (if (= (following-char) ?{) + 0 ; Unless it starts a function body + (c-backward-to-noncomment (or parse-start (point-min))) + ;; Look at previous line that's at column 0 + ;; to determine whether we are in top-level decls + ;; or function's arg decls. Set basic-indent accordingly. + (let ((basic-indent + (save-excursion + (re-search-backward "^[^ \^L\t\n#]" nil 'move) + (let (comment lim) + ;; Recognize the DEFUN macro in Emacs. + (if (save-excursion + ;; Move down to the (putative) argnames line. + (while (and (not (eobp)) + (not (looking-at " *[({}#/]"))) + (forward-line 1)) + ;; Go back to the DEFUN, if it is one. + (condition-case nil + (backward-sexp 1) + (error)) + (beginning-of-line) + (looking-at "DEFUN\\b")) + c-argdecl-indent + (if (and (looking-at "\\sw\\|\\s_") + ;; This is careful to stop at the first + ;; paren if we have + ;; int foo Proto ((int, int)); + (looking-at "[^\"\n=(]*(") + (progn + (goto-char (1- (match-end 0))) + ;; Skip any number of paren-groups. + ;; Consider typedef int (*fcn) (int); + (while (= (following-char) ?\() + (setq lim (point)) + (condition-case nil + (forward-sexp 1) + (error)) + (skip-chars-forward " \t\f")) + ;; Have we reached something + ;; that shows this isn't a function + ;; definition? + (and (< (point) indent-point) + (not (memq (following-char) + '(?\, ?\;))))) + ;; Make sure the "function decl" we found + ;; is not inside a comment. + (progn + ;; Move back to the `(' starting arglist + (goto-char lim) + (beginning-of-line) + (while (and (not comment) + (search-forward "/*" lim t)) + (setq comment + (not (search-forward "*/" lim t)))) + (not comment))) + c-argdecl-indent 0)))))) + basic-indent))) + +;; ;; Now add a little if this is a continuation line. +;; (+ basic-indent (if (or (bobp) +;; (memq (preceding-char) '(?\) ?\; ?\})) +;; ;; Line with zero indentation +;; ;; is probably the return-type +;; ;; of a function definition, +;; ;; so following line is function name. +;; (= (current-indentation) 0)) +;; 0 c-continued-statement-offset)) + + ((/= (char-after containing-sexp) ?{) + ;; line is expression, not statement: + ;; indent to just after the surrounding open. + (goto-char (1+ containing-sexp)) + (current-column)) + (t + ;; Statement level. Is it a continuation or a new statement? + ;; Find previous non-comment character. + (goto-char indent-point) + (c-backward-to-noncomment containing-sexp) + ;; Back up over label lines, since they don't + ;; affect whether our line is a continuation. + (while (or (eq (preceding-char) ?\,) + (and (eq (preceding-char) ?:) + (or (eq (char-after (- (point) 2)) ?\') + (memq (char-syntax (char-after (- (point) 2))) + '(?w ?_))))) + (if (eq (preceding-char) ?\,) + (progn (forward-char -1) + (c-backward-to-start-of-continued-exp containing-sexp))) + (beginning-of-line) + (c-backward-to-noncomment containing-sexp)) + ;; Check for a preprocessor statement or its continuation lines. + ;; Move back to end of previous non-preprocessor line, + ;; or possibly beginning of buffer. + (let ((found (point)) stop) + (while (not stop) + (beginning-of-line) + (cond ((bobp) + (setq found (point) + stop t)) + ((save-excursion (forward-char -1) + (= (preceding-char) ?\\)) + (forward-char -1)) + ;; This line is not preceded by a backslash. + ;; So either it starts a preprocessor command + ;; or any following continuation lines + ;; should not be skipped. + ((= (following-char) ?#) + (forward-char -1) + (setq found (point))) + (t (setq stop t)))) + (goto-char found)) + ;; Now we get the answer. + (if (and (not (memq (preceding-char) '(0 ?\, ?\; ?\} ?\{))) + ;; But don't treat a line with a close-brace + ;; as a continuation. It is probably the + ;; end of an enum type declaration. + (save-excursion + (goto-char indent-point) + (skip-chars-forward " \t") + (not (= (following-char) ?})))) + ;; This line is continuation of preceding line's statement; + ;; indent c-continued-statement-offset more than the + ;; previous line of the statement. + (progn + (c-backward-to-start-of-continued-exp containing-sexp) + (+ c-continued-statement-offset (current-column) + (if (save-excursion (goto-char indent-point) + (skip-chars-forward " \t") + (eq (following-char) ?{)) + c-continued-brace-offset 0))) + ;; This line starts a new statement. + ;; Position following last unclosed open. + (goto-char containing-sexp) + ;; Is line first statement after an open-brace? + (or + ;; If no, find that first statement and indent like it. + (save-excursion + (forward-char 1) + (let ((colon-line-end 0)) + (while (progn (skip-chars-forward " \t\n") + (looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:")) + ;; Skip over comments and labels following openbrace. + (cond ((= (following-char) ?\#) + (forward-line 1)) + ((= (following-char) ?\/) + (forward-char 2) + (search-forward "*/" nil 'move)) + ;; case or label: + (t + (save-excursion (end-of-line) + (setq colon-line-end (point))) + (search-forward ":")))) + ;; The first following code counts + ;; if it is before the line we want to indent. + (and (< (point) indent-point) + (- + (if (> colon-line-end (point)) + (- (current-indentation) c-label-offset) + (current-column)) + ;; If prev stmt starts with open-brace, that + ;; open brace was offset by c-brace-offset. + ;; Compensate to get the column where + ;; an ordinary statement would start. + (if (= (following-char) ?\{) c-brace-offset 0))))) + ;; If no previous statement, + ;; indent it relative to line brace is on. + (calculate-c-indent-after-brace)))))))) + +(defun calculate-c-indent-after-brace () + "Return the proper C indent for the first line after an open-brace. +This function is called with point before the brace." + ;; For open brace in column zero, don't let statement + ;; start there too. If c-indent-level is zero, + ;; use c-brace-offset + c-continued-statement-offset instead. + ;; For open-braces not the first thing in a line, + ;; add in c-brace-imaginary-offset. + (+ (if (and (bolp) (zerop c-indent-level)) + (+ c-brace-offset c-continued-statement-offset) + c-indent-level) + ;; Move back over whitespace before the openbrace. + ;; If openbrace is not first nonwhite thing on the line, + ;; add the c-brace-imaginary-offset. + (progn (skip-chars-backward " \t") + (if (bolp) 0 c-brace-imaginary-offset)) + ;; If the openbrace is preceded by a parenthesized exp, + ;; move to the beginning of that; + ;; possibly a different line + (progn + (if (eq (preceding-char) ?\)) + (forward-sexp -1)) + ;; Get initial indentation of the line we are on. + (current-indentation)))) + +(defun calculate-c-indent-within-comment (&optional after-star) + "Return the indentation amount for line inside a block comment. +Optional arg AFTER-STAR means, if lines in the comment have a leading star, +return the indentation of the text that would follow this star." + (let (end star-start) + (save-excursion + (beginning-of-line) + (skip-chars-forward " \t") + (setq star-start (= (following-char) ?\*)) + (skip-chars-backward " \t\n") + (setq end (point)) + (beginning-of-line) + (skip-chars-forward " \t") + (if after-star + (and (looking-at "\\*") + (re-search-forward "\\*[ \t]*"))) + (and (re-search-forward "/\\*[ \t]*" end t) + star-start + (not after-star) + (goto-char (1+ (match-beginning 0)))) + (if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*)) + (1+ (current-column)) + (current-column))))) + + +(defun c-backward-to-noncomment (lim) + (let (opoint stop) + (while (not stop) + (skip-chars-backward " \t\n\f" lim) + (setq opoint (point)) + (if (and (>= (point) (+ 2 lim)) + (save-excursion + (forward-char -2) + (looking-at "\\*/"))) + (search-backward "/*" lim 'move) + (setq stop (or (<= (point) lim) + (save-excursion + (while (progn + (beginning-of-line) + (eq ?\\ (char-after (- (point) 2)))) + (forward-char -1) + (beginning-of-line)) + (skip-chars-forward " \t") + (not (looking-at "#"))))) + (or stop (beginning-of-line)))))) + +(defun c-backward-to-start-of-continued-exp (lim) + (if (memq (preceding-char) '(?\) ?\")) + (forward-sexp -1)) + (beginning-of-line) + (if (<= (point) lim) + (goto-char (1+ lim))) + (skip-chars-forward " \t")) + +(defun c-backward-to-start-of-if (&optional limit) + "Move to the start of the last \"unbalanced\" `if'." + (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) + (let ((if-level 1) + (case-fold-search nil)) + (while (and (not (bobp)) (not (zerop if-level))) + (backward-sexp 1) + (cond ((and (looking-at "else\\b") + (not (looking-at "else\\s_"))) + (setq if-level (1+ if-level))) + ((and (looking-at "if\\b") + (not (looking-at "if\\s_"))) + (setq if-level (1- if-level))) + ((< (point) limit) + (setq if-level 0) + (goto-char limit)))))) + +(defun c-backward-to-start-of-do (&optional limit) + "If point follows a `do' statement, move to beginning of it and return t. +Otherwise return nil and don't move point." + (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) + (let ((first t) + (startpos (point)) + (done nil)) + (while (not done) + (let ((next-start (point))) + (condition-case nil + ;; Move back one token or one brace or paren group. + (backward-sexp 1) + ;; If we find an open-brace, we lose. + (error (setq done 'fail))) + (if done + nil + ;; If we reached a `do', we win. + (if (looking-at "do\\b") + (setq done 'succeed) + ;; Otherwise, if we skipped a semicolon, we lose. + ;; (Exception: we can skip one semicolon before getting + ;; to a the last token of the statement, unless that token + ;; is a close brace.) + (if (save-excursion + (forward-sexp 1) + (or (and (not first) (= (preceding-char) ?})) + (search-forward ";" next-start t + (if (and first + (/= (preceding-char) ?})) + 2 1)))) + (setq done 'fail) + (setq first nil) + ;; If we go too far back in the buffer, we lose. + (if (< (point) limit) + (setq done 'fail))))))) + (if (eq done 'succeed) + t + (goto-char startpos) + nil))) + +(defun c-beginning-of-statement (count) + "Go to the beginning of the innermost C statement. +With prefix arg, go back N - 1 statements. If already at the beginning of a +statement then go to the beginning of the preceding one. +If within a string or comment, or next to a comment (only whitespace between), +move by sentences instead of statements." + (interactive "p") + (let ((here (point)) state) + (save-excursion + (beginning-of-defun) + (setq state (parse-partial-sexp (point) here nil nil))) + (if (or (nth 3 state) (nth 4 state) + (looking-at (concat "[ \t]*" comment-start-skip)) + (save-excursion (skip-chars-backward " \t") + (goto-char (- (point) 2)) + (looking-at "\\*/"))) + (forward-sentence (- count)) + (while (> count 0) + (c-beginning-of-statement-1) + (setq count (1- count))) + (while (< count 0) + (c-end-of-statement-1) + (setq count (1+ count)))))) + +(defun c-end-of-statement (count) + "Go to the end of the innermost C statement. +With prefix arg, go forward N - 1 statements. +Move forward to end of the next statement if already at end. +If within a string or comment, move by sentences instead of statements." + (interactive "p") + (c-beginning-of-statement (- count))) + +(defun c-beginning-of-statement-1 () + (let ((last-begin (point)) + (first t)) + (condition-case () + (progn + (while (and (not (bobp)) + (progn + (backward-sexp 1) + (or first + (not (re-search-forward "[;{}]" last-begin t))))) + (setq last-begin (point) first nil)) + (goto-char last-begin)) + (error (if first (backward-up-list 1) (goto-char last-begin)))))) + +(defun c-end-of-statement-1 () + (condition-case () + (progn + (while (and (not (eobp)) + (let ((beg (point))) + (forward-sexp 1) + (let ((end (point))) + (save-excursion + (goto-char beg) + (not (re-search-forward "[;{}]" end t))))))) + (re-search-backward "[;}]") + (forward-char 1)) + (error + (let ((beg (point))) + (backward-up-list -1) + (let ((end (point))) + (goto-char beg) + (search-forward ";" end 'move)))))) + +(defun mark-c-function () + "Put mark at end of C function, point at beginning." + (interactive) + (push-mark (point)) + (end-of-defun) + (push-mark (point) nil t) + (beginning-of-defun) + (backward-paragraph)) + +;; Idea of ENDPOS is, indent each line, stopping when +;; ENDPOS is encountered. But it's too much of a pain to make that work. +(defun indent-c-exp (&optional endpos) + "Indent each line of the C grouping following point." + (interactive) + (let* ((indent-stack (list nil)) + (opoint (point)) ;; May be altered below. + (contain-stack + (list (if endpos + (let (funbeg) + ;; Find previous fcn-start. + (save-excursion (forward-char 1) + (beginning-of-defun) + (setq funbeg (point))) + (setq opoint funbeg) + ;; Try to find containing open, + ;; but don't scan past that fcn-start. + (save-restriction + (narrow-to-region funbeg (point)) + (condition-case nil + (save-excursion + (backward-up-list 1) (point)) + ;; We gave up: must be between fcns. + ;; Set opoint to beg of prev fcn + ;; since otherwise calculate-c-indent + ;; will get wrong answers. + (error +;;;#### Commented-out in XEmacs, present in FSFmacs +; (setq opoint funbeg) + (point))))) + (point)))) + (case-fold-search nil) + restart outer-loop-done inner-loop-done state ostate + this-indent last-sexp + at-else at-brace at-while + last-depth this-point + (next-depth 0)) + ;; If the braces don't match, get an error right away. + (save-excursion + (forward-sexp 1)) + ;; Realign the comment on the first line, even though we don't reindent it. + (save-excursion + (let ((beg (point))) + (and (re-search-forward + comment-start-skip + (save-excursion (end-of-line) (point)) t) + ;; Make sure this isn't a comment alone on a line + ;; (which should be indented like code instead). + (save-excursion + (goto-char (match-beginning 0)) + (skip-chars-backward " \t") + (not (bolp))) + ;; Make sure the comment starter we found + ;; is not actually in a string or quoted. + (let ((new-state + (parse-partial-sexp beg (point) + nil nil state))) + (and (not (nth 3 new-state)) (not (nth 5 new-state)))) + (progn (indent-for-comment) (beginning-of-line))))) + (save-excursion + (setq outer-loop-done nil) + (while (and (not (eobp)) + (if endpos + (< (point) endpos) + (not outer-loop-done))) + (setq last-depth next-depth) + ;; Compute how depth changes over this line + ;; plus enough other lines to get to one that + ;; does not end inside a comment or string. + ;; Meanwhile, do appropriate indentation on comment lines. + (setq inner-loop-done nil) + (while (and (not inner-loop-done) + (not (and (eobp) (setq outer-loop-done t)))) + (setq ostate state) + (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) + nil nil state)) + (setq next-depth (car state)) + (if (and (car (cdr (cdr state))) + (>= (car (cdr (cdr state))) 0)) + (setq last-sexp (car (cdr (cdr state))))) + ;; If this line started within a comment, indent it as such. + (if (or (nth 4 ostate) (nth 7 ostate)) + (c-indent-line)) + ;; If it ends outside of comments or strings, exit the inner loop. + ;; Otherwise move on to next line. + (if (or (nth 3 state) (nth 4 state) (nth 7 state)) + (forward-line 1) + (setq inner-loop-done t))) + (and endpos + (while (< next-depth 0) + (setq indent-stack (append indent-stack (list nil))) + (setq contain-stack (append contain-stack (list nil))) + (setq next-depth (1+ next-depth)) + (setq last-depth (1+ last-depth)) + (setcar (nthcdr 6 state) (1+ (nth 6 state))))) + (setq outer-loop-done (and (not endpos) (<= next-depth 0))) + (if outer-loop-done + nil + ;; If this line had ..))) (((.. in it, pop out of the levels + ;; that ended anywhere in this line, even if the final depth + ;; doesn't indicate that they ended. + (while (> last-depth (nth 6 state)) + (setq indent-stack (cdr indent-stack) + contain-stack (cdr contain-stack) + last-depth (1- last-depth))) + (if (/= last-depth next-depth) + (setq last-sexp nil)) + ;; Add levels for any parens that were started in this line. + (while (< last-depth next-depth) + (setq indent-stack (cons nil indent-stack) + contain-stack (cons nil contain-stack) + last-depth (1+ last-depth))) + (if (null (car contain-stack)) + (setcar contain-stack (or (car (cdr state)) + (save-excursion (forward-sexp -1) + (point))))) + (forward-line 1) + (skip-chars-forward " \t") + ;; Don't really reindent if the line is just whitespace, + ;; or if it is past the endpos. + ;; (The exit test in the outer while + ;; does not exit until we have passed the first line + ;; past the region.) + (if (or (eolp) (and endpos (>= (point) endpos))) + nil + ;; Is this line in a new nesting level? + ;; In other words, is this the first line that + ;; starts in the new level? + (if (and (car indent-stack) + (>= (car indent-stack) 0)) + nil + ;; Yes. + ;; Compute the standard indent for this level. + (let (val) + (if (= (char-after (car contain-stack)) ?{) + (save-excursion + (goto-char (car contain-stack)) + (setq val (calculate-c-indent-after-brace))) + (setq val (calculate-c-indent + (if (car indent-stack) + (- (car indent-stack)) + opoint)))) + ;; t means we are in a block comment and should + ;; calculate accordingly. + (if (eq val t) + (setq val (calculate-c-indent-within-comment))) + (setcar indent-stack val))) + ;; Adjust indent of this individual line + ;; based on its predecessor. + ;; Handle continuation lines, if, else, while, and so on. + (if (/= (char-after (car contain-stack)) ?{) + (setq this-indent (car indent-stack)) + ;; Line is at statement level. + ;; Is it a new statement? Is it an else? + ;; Find last non-comment character before this line + (save-excursion + (setq this-point (point)) + (setq at-else (and (looking-at "else\\b") + (not (looking-at "else\\s_")))) + (setq at-brace (= (following-char) ?{)) + (setq at-while (and (looking-at "while\\b") + (not (looking-at "while\\s_")))) + (if (= (following-char) ?}) + (setq this-indent (car indent-stack)) + (c-backward-to-noncomment opoint) + (if (not (memq (preceding-char) '(0 ?\, ?\; ?} ?: ?{))) + ;; Preceding line did not end in comma or semi; + ;; indent this line c-continued-statement-offset + ;; more than previous. + (progn + (c-backward-to-start-of-continued-exp (car contain-stack)) + (setq this-indent + (+ c-continued-statement-offset (current-column) + (if at-brace c-continued-brace-offset 0)))) + ;; Preceding line ended in comma or semi; + ;; use the standard indent for this level. + (cond (at-else (progn (c-backward-to-start-of-if opoint) + (setq this-indent + (current-indentation)))) + ((and at-while (c-backward-to-start-of-do opoint)) + (setq this-indent (current-indentation))) + ((eq (preceding-char) ?\,) + (goto-char this-point) + (setq this-indent (calculate-c-indent))) + (t (setq this-indent (car indent-stack)))))))) + ;; Adjust line indentation according to its contents + (if (or (looking-at c-switch-label-regexp) + (and (looking-at "[A-Za-z]") + (save-excursion + (forward-sexp 1) + (looking-at ":")))) + (setq this-indent (max 1 (+ this-indent c-label-offset)))) + (if (= (following-char) ?}) + (setq this-indent (- this-indent c-indent-level))) + (if (= (following-char) ?{) + ;; Don't move an open-brace in column 0. + ;; This is good when constructs such as + ;; `extern "C" {' surround a function definition + ;; that should be indented as usual. + ;; It is also good for nested functions. + ;; It is bad when an open-brace is indented at column 0 + ;; and you want to fix that, but we can't win 'em all. + (if (zerop (current-column)) + (setq this-indent 0) + (setq this-indent (+ this-indent c-brace-offset)))) + ;; Don't leave indentation in empty lines. + (if (eolp) (setq this-indent 0)) + ;; Put chosen indentation into effect. + (or (= (current-column) this-indent) + (= (following-char) ?\#) + (progn + (delete-region (point) (progn (beginning-of-line) (point))) + (indent-to this-indent))) + ;; Indent any comment following the text. + (or (looking-at comment-start-skip) + (save-excursion + (let ((beg (point))) + (and (re-search-forward + comment-start-skip + (save-excursion (end-of-line) (point)) t) + ;; Make sure the comment starter we found + ;; is not actually in a string or quoted. + (let ((new-state + (parse-partial-sexp beg (point) + nil nil state))) + (and (not (nth 3 new-state)) + (not (nth 5 new-state)))) + (indent-for-comment))))))))))) + +;; Look at all comment-start strings in the current line after point. +;; Return t if one of them starts a real comment. +;; This is not used yet, because indent-for-comment +;; isn't smart enough to handle the cases this can find. +(defun indent-c-find-real-comment () + (let (win) + (while (and (not win) + (re-search-forward comment-start-skip + (save-excursion (end-of-line) (point)) + t)) + ;; Make sure the comment start is not quoted. + (let ((state-1 + (parse-partial-sexp + (save-excursion (beginning-of-line) (point)) + (point) nil nil state))) + (setq win (and (null (nth 3 state-1)) (null (nth 5 state-1)))))) + win)) + +;; Indent every line whose first char is between START and END inclusive. +(defun c-indent-region (start end) + (save-excursion + (goto-char start) + ;; Advance to first nonblank line. + (skip-chars-forward " \t\n") + (beginning-of-line) + (let ((endmark (copy-marker end)) + (c-tab-always-indent t)) + (while (and (bolp) (not (eobp)) (< (point) endmark)) + ;; Indent one line as with TAB. + (let ((shift-amt (c-indent-line)) + nextline sexpbeg sexpend) + (if (save-excursion (beginning-of-line) (looking-at "[ \t]*#")) + (forward-line 1) + (save-excursion + ;; Find beginning of following line. + (save-excursion + (forward-line 1) (setq nextline (point))) + ;; Find first beginning-of-sexp for sexp extending past this line. + (beginning-of-line) + (while (< (point) nextline) + (condition-case nil + (progn + (forward-sexp 1) + (setq sexpend (point-marker))) + (error (setq sexpend nil) + (goto-char nextline))) + (skip-chars-forward " \t\n")) + (if sexpend + (progn + ;; Make sure the sexp we found really starts on the + ;; current line and extends past it. + (goto-char sexpend) + (backward-sexp 1) + (setq sexpbeg (point))))) + ;; If that sexp ends within the region, + ;; indent it all at once, fast. + (if (and sexpend (> sexpend nextline) (<= sexpend endmark) + (< sexpbeg nextline)) + (progn + (indent-c-exp) + (goto-char sexpend))) + ;; Move to following line and try again. + (and sexpend (set-marker sexpend nil)) + (forward-line 1)))) + (set-marker endmark nil)))) + +(defun set-c-style (style &optional global) + "Set C-mode variables to use one of several different indentation styles. +The arguments are a string representing the desired style +and a flag which, if non-nil, means to set the style globally. +\(Interactively, the flag comes from the prefix argument.) +Available styles are GNU, K&R, BSD and Whitesmith." + (interactive (list (let ((completion-ignore-case t)) + (completing-read "Use which C indentation style? " + c-style-alist nil t)) + current-prefix-arg)) + (let ((vars (cdr (assoc style c-style-alist)))) + (or vars + (error "Invalid C indentation style `%s'" style)) + (while vars + (or global + (make-local-variable (car (car vars)))) + (set (car (car vars)) (cdr (car vars))) + (setq vars (cdr vars))))) + +;;; This page handles insertion and removal of backslashes for C macros. + +(defvar c-backslash-column 48 + "*Minimum column for end-of-line backslashes of macro definitions.") + +(defun c-backslash-region (from to delete-flag) + "Insert, align, or delete end-of-line backslashes on the lines in the region. +With no argument, inserts backslashes and aligns existing backslashes. +With an argument, deletes the backslashes. + +This function does not modify the last line of the region if the region ends +right at the start of the following line; it does not modify blank lines +at the start of the region. So you can put the region around an entire macro +definition and conveniently use this command." + (interactive "r\nP") + (save-excursion + (goto-char from) + (let ((column c-backslash-column) + (endmark (make-marker))) + (move-marker endmark to) + ;; Compute the smallest column number past the ends of all the lines. + (if (not delete-flag) + (while (< (point) to) + (end-of-line) + (if (= (preceding-char) ?\\) + (progn (forward-char -1) + (skip-chars-backward " \t"))) + (setq column (max column (1+ (current-column)))) + (forward-line 1))) + ;; Adjust upward to a tab column, if that doesn't push past the margin. + (if (> (% column tab-width) 0) + (let ((adjusted (* (/ (+ column tab-width -1) tab-width) tab-width))) + (if (< adjusted (window-width)) + (setq column adjusted)))) + ;; Don't modify blank lines at start of region. + (goto-char from) + (while (and (< (point) endmark) (eolp)) + (forward-line 1)) + ;; Add or remove backslashes on all the lines. + (while (and (< (point) endmark) + ;; Don't backslashify the last line + ;; if the region ends right at the start of the next line. + (save-excursion + (forward-line 1) + (< (point) endmark))) + (if (not delete-flag) + (c-append-backslash column) + (c-delete-backslash)) + (forward-line 1)) + (move-marker endmark nil)))) + +(defun c-append-backslash (column) + (end-of-line) + ;; Note that "\\\\" is needed to get one backslash. + (if (= (preceding-char) ?\\) + (progn (forward-char -1) + (delete-horizontal-space) + (indent-to column)) + (indent-to column) + (insert "\\"))) + +(defun c-delete-backslash () + (end-of-line) + (or (bolp) + (progn + (forward-char -1) + (if (looking-at "\\\\") + (delete-region (1+ (point)) + (progn (skip-chars-backward " \t") (point))))))) + +(defun c-up-conditional (count) + "Move back to the containing preprocessor conditional, leaving mark behind. +A prefix argument acts as a repeat count. With a negative argument, +move forward to the end of the containing preprocessor conditional. +When going backwards, `#elif' is treated like `#else' followed by `#if'. +When going forwards, `#elif' is ignored." + (interactive "p") + (c-forward-conditional (- count) t)) + +(defun c-backward-conditional (count &optional up-flag) + "Move back across a preprocessor conditional, leaving mark behind. +A prefix argument acts as a repeat count. With a negative argument, +move forward across a preprocessor conditional." + (interactive "p") + (c-forward-conditional (- count) up-flag)) + +(defun c-forward-conditional (count &optional up-flag) + "Move forward across a preprocessor conditional, leaving mark behind. +A prefix argument acts as a repeat count. With a negative argument, +move backward across a preprocessor conditional." + (interactive "p") + (let* ((forward (> count 0)) + (increment (if forward -1 1)) + (search-function (if forward 're-search-forward 're-search-backward)) + (opoint (point)) + (new)) + (save-excursion + (while (/= count 0) + (let ((depth (if up-flag 0 -1)) found) + (save-excursion + ;; Find the "next" significant line in the proper direction. + (while (and (not found) + ;; Rather than searching for a # sign that comes + ;; at the beginning of a line aside from whitespace, + ;; search first for a string starting with # sign. + ;; Then verify what precedes it. + ;; This is faster on account of the fastmap feature of + ;; the regexp matcher. + (funcall search-function + "#[ \t]*\\(if\\|elif\\|endif\\)" + nil t)) + (beginning-of-line) + ;; Now verify it is really a preproc line. + (if (looking-at "^[ \t]*#[ \t]*\\(if\\|elif\\|endif\\)") + (let ((prev depth)) + ;; Update depth according to what we found. + (beginning-of-line) + (cond ((looking-at "[ \t]*#[ \t]*endif") + (setq depth (+ depth increment))) + ((looking-at "[ \t]*#[ \t]*elif") + (if (and forward (= depth 0)) + (setq found (point)))) + (t (setq depth (- depth increment)))) + ;; If we are trying to move across, and we find + ;; an end before we find a beginning, get an error. + (if (and (< prev 0) (< depth prev)) + (error (if forward + "No following conditional at this level" + "No previous conditional at this level"))) + ;; When searching forward, start from next line + ;; so that we don't find the same line again. + (if forward (forward-line 1)) + ;; If this line exits a level of conditional, exit inner loop. + (if (< depth 0) + (setq found (point)))) + ;; If the line is not really a conditional, skip past it. + (if forward (end-of-line))))) + (or found + (error "No containing preprocessor conditional")) + (goto-char (setq new found))) + (setq count (+ count increment)))) + (push-mark) + (goto-char new))) + +;;; c-mode.el ends here