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Diffstat (limited to 'lisp/progmodes/c-mode.el')
| -rw-r--r-- | lisp/progmodes/c-mode.el | 1650 |
1 files changed, 0 insertions, 1650 deletions
diff --git a/lisp/progmodes/c-mode.el b/lisp/progmodes/c-mode.el deleted file mode 100644 index f3364457e18..00000000000 --- a/lisp/progmodes/c-mode.el +++ /dev/null @@ -1,1650 +0,0 @@ -;;; 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 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: - -;; 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 (make-sparse-keymap) - "Keymap used in C mode.") - -(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-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) - -(define-key c-mode-map [menu-bar] (make-sparse-keymap)) - -;; "C-mode" is not strictly the right punctuation--it should be "C -;; mode"--but that would look like two menu items. "C-mode" is the -;; best alternative I can think of. -(define-key c-mode-map [menu-bar c] - (cons "C-mode" (make-sparse-keymap "C-mode"))) - -(define-key c-mode-map [menu-bar c comment-region] - '("Comment Out Region" . comment-region)) -(define-key c-mode-map [menu-bar c c-macro-expand] - '("Macro Expand Region" . c-macro-expand)) -(define-key c-mode-map [menu-bar c c-backslash-region] - '("Backslashify" . c-backslash-region)) -(define-key c-mode-map [menu-bar c indent-exp] - '("Indent Expression" . indent-c-exp)) -(define-key c-mode-map [menu-bar c indent-line] - '("Indent Line" . c-indent-command)) -(define-key c-mode-map [menu-bar c fill] - '("Fill Comment Paragraph" . c-fill-paragraph)) -(define-key c-mode-map [menu-bar c cpp-highlight-buffer] - '("Highlight Conditionals" . cpp-highlight-buffer)) -(define-key c-mode-map [menu-bar c up] - '("Up Conditional" . c-up-conditional)) -(define-key c-mode-map [menu-bar c backward] - '("Backward Conditional" . c-backward-conditional)) -(define-key c-mode-map [menu-bar c forward] - '("Forward Conditional" . c-forward-conditional)) -(define-key c-mode-map [menu-bar c backward-stmt] - '("Backward Statement" . c-beginning-of-statement)) -(define-key c-mode-map [menu-bar c forward-stmt] - '("Forward Statement" . c-end-of-statement)) - -(put 'comment-region 'menu-enable 'mark-active) -(put 'c-macro-expand 'menu-enable 'mark-active) -(put 'c-backslash-region 'menu-enable 'mark-active) - -(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)) - -(defconst c-indent-level 2 - "*Indentation of C statements with respect to containing block.") -(defconst c-brace-imaginary-offset 0 - "*Imagined indentation of a C open brace that actually follows a statement.") -(defconst c-brace-offset 0 - "*Extra indentation for braces, compared with other text in same context.") -(defconst c-argdecl-indent 5 - "*Indentation level of declarations of C function arguments.") -(defconst c-label-offset -2 - "*Offset of C label lines and case statements relative to usual indentation.") -(defconst c-continued-statement-offset 2 - "*Extra indent for lines not starting new statements.") -(defconst 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)))) - -(defconst 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)") - -(defconst 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. -(defconst c-switch-label-regexp "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-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 "$\\|" page-delimiter)) - (make-local-variable 'paragraph-separate) - (setq paragraph-separate paragraph-start) - (make-local-variable 'paragraph-ignore-fill-prefix) - (setq paragraph-ignore-fill-prefix t) - (make-local-variable 'fill-paragraph-function) - (setq fill-paragraph-function 'c-fill-paragraph) - (make-local-variable 'indent-line-function) - (setq indent-line-function 'c-indent-line) - (make-local-variable 'indent-region-function) - (setq indent-region-function 'c-indent-region) - (make-local-variable 'require-final-newline) - (setq require-final-newline t) - (make-local-variable 'outline-regexp) - (setq outline-regexp "[^#\n\^M]") - (make-local-variable 'outline-level) - (setq outline-level 'c-outline-level) - (make-local-variable 'comment-start) - (setq comment-start "/* ") - (make-local-variable 'comment-end) - (setq comment-end " */") - (make-local-variable 'comment-column) - (setq comment-column 32) - (make-local-variable 'comment-start-skip) - (setq comment-start-skip "/\\*+ *") - (make-local-variable 'comment-indent-function) - (setq comment-indent-function 'c-comment-indent) - (make-local-variable 'comment-multi-line) - (setq comment-multi-line t) - (make-local-variable 'parse-sexp-ignore-comments) - (setq parse-sexp-ignore-comments t) - (make-local-variable 'imenu-generic-expression) - (setq imenu-generic-expression c-imenu-generic-expression) - (run-hooks 'c-mode-hook)) - -(defun c-outline-level () - (save-excursion - (skip-chars-forward "\t ") - (current-column))) - -;; This is used by indent-for-comment -;; to decide how much to indent a comment in C code -;; based on its context. -(defun c-comment-indent () - (if (looking-at "^/\\*") - 0 ;Existing comment at bol stays there. - (let ((opoint (point))) - (save-excursion - (beginning-of-line) - (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)") - ;; 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 - "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) - (paragraph-separate - (concat - paragraph-separate - "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) - (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) - (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 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 - (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 (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))) - -(provide 'c-mode) - -;;; c-mode.el ends here |