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Diffstat (limited to 'lisp/progmodes/cplus-md.el')
| -rw-r--r-- | lisp/progmodes/cplus-md.el | 966 |
1 files changed, 966 insertions, 0 deletions
diff --git a/lisp/progmodes/cplus-md.el b/lisp/progmodes/cplus-md.el new file mode 100644 index 00000000000..f5082895e1e --- /dev/null +++ b/lisp/progmodes/cplus-md.el @@ -0,0 +1,966 @@ +;; C++ code editing commands for Emacs +;; 1987 Dave Detlefs (dld@cs.cmu.edu) +;; and Stewart Clamen (clamen@cs.cmu.edu). +;; Done by fairly faithful modification of: +;; c-mode.el, Copyright (C) 1985 Richard M. Stallman. +;; +;; Feb, 1990 (Dave Detlefs, dld@cs.cmu.edu) +;; Fixed electric-c++-terminator to handle double colons, at the +;; request of John Hagerman. +;; +;; Jan, 1990 (Doug Lea, dl@oswego.edu) +;; Replaced c++-comment-region and c++-uncomment-region with +;; versions from Igor Metz that avoid potential infinite loops. +;; +;; Oct, 1989 (Dave Detlefs, dld@cs.cmu.edu) +;; Added contribution from Igor Metz <metz@iam.unibe.ch>: +;; functions c++-comment-region and c++-uncomment-region and +;; corresponding key-binding. +;; Also fixed bug in indentation of second line after an empty +;; arglist with empty-arglist non-null. +;; +;; Sept, 1989 (Glen Ditchfield, gjditchfield@violet.uwaterloo.ca): +;; Textual changes to more closely imitate Emacs 18.55's c-mode. +;; Fixed handling of "default:", where ":" was the last character in the +;; buffer. Fixed indentation of comments starting in column 0, and when +;; previous line contained more than one comment start string. Fixed +;; handling of "friend class". +;; +;; Aug 7, 1989; John Hagerman (hagerman@ece.cmu.edu): +;; Changed calculate-c++-indent to handle member initializations +;; more flexibly. Two new variables are used to control behavior: +;; c++-member-init-indent and c++-continued-member-init-offset. +;; Note the assumption that member initializations and argument +;; declarations are not mixed in one function definition. +;; +;; June 1989 (Dave Detlefs, dld@cs.cmu.edu) +;; Fixed calculate-c++-indent to handle continued lines ending in +;; {'s. (I wasn't following C-mode closely enough, or C-mode +;; changed.) Made ' a quote character, at the behest of someone +;; whose mail I apparently deleted (if they send me mail I'll credit +;; them here in a future revision.) +;; Dan Weinreb (dlw@odi.com) pointed out that 'c++-mode successively +;; bound c++-indent-exp and c++-indent-defun to ESC-^q. ESC-^q is +;; now bound to c++-indent-exp, while, c++-indent-defun is invoked +;; with ESC-^x. + +;; February 1989 (Dave Detlefs, dld@cs.cmu.edu) +;; Fixed some errors in c++-indent-defun, as pointed out by Sam +;; Haradhvala (odi!sam@talcott.harvard.edu). +;; October 1988 (Dave Detlefs, dld@cs.cmu.edu) +;; It turns out I had only *thought* I had made +;; beginning(end)-of-defun work. It should work better now -- you +;; can either attempt to match defun headers "strongly," using a +;; very complicated regexp, or "weakly," using a simple one. This +;; is settable by a variable; the default is the cheaper weak +;; method. (Stewart Clamen was intimately involved in this, too.) +;; +;; I made "'" *not* be a string delimiter, because that was causing +;; comments containing contractions to ("// don't") to mess up paren +;; balancing. +;; +;; I also incorporated another slight indentation fix from Glen +;; Ditchfield. +;; +;; We hope this is will make into version 19 of gnu-emacs. +;; +;; September 1988: incorporated changes from Fred Calm at Schlumberger. +;; Also, made beginning(end)-of-defun, indent-defun work. +;; +;; August 1987: incorporated changes done by Glen Ditchfield of Waterloo. + +(defvar c++-mode-abbrev-table nil + "Abbrev table used in C++ mode.") +(define-abbrev-table 'c++-mode-abbrev-table ()) + +(defvar c++-mode-map () + "Keymap used in C++ mode.") +(if c++-mode-map + () + (setq c++-mode-map (make-sparse-keymap)) + (define-key c++-mode-map "\C-j" 'reindent-then-newline-and-indent) + (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 "\e\C-h" 'mark-c-function) + (define-key c++-mode-map "\e\C-q" 'indent-c++-exp) + (define-key c++-mode-map "\177" 'backward-delete-char-untabify) + (define-key c++-mode-map "\t" 'c++-indent-command) + (define-key c++-mode-map "\C-c\C-i" 'c++-insert-header) + (define-key c++-mode-map "\C-c\C-\\" 'c++-macroize-region) + (define-key c++-mode-map "\C-c\C-c" 'c++-comment-region) + (define-key c++-mode-map "\C-c\C-u" 'c++-uncomment-region) + (define-key c++-mode-map "\e\C-a" 'c++-beginning-of-defun) + (define-key c++-mode-map "\e\C-e" 'c++-end-of-defun) + (define-key c++-mode-map "\e\C-x" 'c++-indent-defun)) + +(defvar c++-mode-syntax-table nil + "Syntax table used in C++ mode.") + +(if c++-mode-syntax-table + () + (setq c++-mode-syntax-table (copy-syntax-table c-mode-syntax-table)) + (modify-syntax-entry ?/ ". 12" c++-mode-syntax-table) + (modify-syntax-entry ?\n ">" c++-mode-syntax-table) + (modify-syntax-entry ?\' "." c++-mode-syntax-table)) + +(defvar c++-continued-member-init-offset nil + "*Extra indent for continuation lines of member inits; +NIL means to align with previous initializations rather than +with the colon on the first line.") +(defvar c++-member-init-indent 0 + "*Indentation level of member initializations in function declarations.") +(defvar c++-friend-offset -4 + "*Offset of C++ friend class declarations relative to member declarations.") +(defvar c++-electric-colon t + "*If t, colon is an electric terminator.") +(defvar c++-empty-arglist-indent nil + "*Indicates how far to indent an line following an empty argument +list. Nil indicates to just after the paren.") + + +;;;###autoload +(defun c++-mode () + "Major mode for editing C++ code. Very much like editing C code. +Expression and list commands understand all C++ brackets. +Tab at left margin indents for C++ code +Comments are delimited with /* ... */ {or with // ... <newline>} +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. + Default is t. + 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:'', or + ``public:'' or ``private:'', or ``protected:''. + c++-electric-colon + If non-nil at invocation of c++-mode (t is the default) colon electricly + indents. + c++-empty-arglist-indent + If non-nil, a function declaration or invocation which ends a line with a + left paren is indented this many extra spaces, instead of flush with the + left paren. + c++-friend-offset + Offset of C++ friend class declarations relative to member declarations. + c++-member-init-indent + Indentation level of member initializations in function declarations, + if they are on a separate line beginning with a colon. + c++-continued-member-init-offset + Extra indentation for continuation lines of member initializations; NIL + means to align with previous initializations rather than with the colon. + +Settings for K&R, BSD, and Stroustrup indentation styles are + c-indent-level 5 8 4 + c-continued-statement-offset 5 8 4 + c-continued-brace-offset 0 + c-brace-offset -5 -8 0 + c-brace-imaginary-offset 0 + c-argdecl-indent 0 8 4 + c-label-offset -5 -8 -4 + c++-empty-arglist-indent 4 + c++-friend-offset 0 + +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) + (set-syntax-table c++-mode-syntax-table) + (setq major-mode 'c++-mode + mode-name "C++" + comment-column 32 + local-abbrev-table c++-mode-abbrev-table) + (set (make-local-variable 'indent-line-function) 'c++-indent-line) + (set (make-local-variable 'comment-start) "// ") + (set (make-local-variable 'comment-end) "") + (set (make-local-variable 'comment-start-skip) "/\\*+ *\\|// *") + (set (make-local-variable 'comment-indent-hook) 'c++-comment-indent) + (set (make-local-variable 'paragraph-start) (concat "^$\\|" page-delimiter)) + (set (make-local-variable 'paragraph-separate) paragraph-start) + (set (make-local-variable 'paragraph-ignore-fill-prefix) t) + (set (make-local-variable 'require-final-newline) t) + (set (make-local-variable 'parse-sexp-ignore-comments) nil) + (run-hooks 'c++-mode-hook) + (if c++-electric-colon + (define-key c++-mode-map ":" 'electric-c++-terminator))) + +;; 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. + (save-excursion + (skip-chars-backward " \t") + (max + ;; leave at least one space on non-empty lines. + (if (zerop (current-column)) 0 (1+ (current-column))) + (let ((cur-pt (point))) + (beginning-of-line 0) + ;; If previous line had a comment, use it's indent + (if (re-search-forward comment-start-skip cur-pt t) + (progn + (goto-char (match-beginning 0)) + (current-column)) + comment-column)))))) ; otherwise indent at comment column. + +(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)))) + (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++-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, or another colon. + ;; So quickly rule out most other uses of colon + ;; and do no indentation for them. + (and (eq last-command-char ?:) + (not (looking-at "case[ \t]")) + (save-excursion + (forward-word 1) + (skip-chars-forward " \t") + (< (point) end)) + ;; Do re-indent double colons + (save-excursion + (end-of-line 1) + (looking-at ":"))) + (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 + ;; the new marker object, used to be just an integer + (setq insertpos (make-marker)) + ;; changed setq to set-marker + (set-marker insertpos (1- (point))) + ;; do this before the newline, since in auto fill can break + (newline) + (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++-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 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)) + (setq beg (point)) + (forward-sexp 1) + (setq end (point)) + (goto-char beg) + (forward-line 1) + (setq beg (point))) + (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 ((looking-at "\\(default\\|public\\|private\\|protected\\):") + (setq indent (+ indent c-label-offset))) + ((or (looking-at "case\\b") + (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)))) + ((looking-at "friend\[ \t]class[ \t]") + (setq indent (+ indent c++-friend-offset))) + ((= (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 or member initialization. + ;; Indent like the previous top level line unless + ;; (1) the previous line ends in a closeparen without semicolon, + ;; in which case this line is the first argument declaration or + ;; member initialization, or + ;; (2) the previous line begins with a colon, + ;; in which case this is the second line of member inits. + ;; It is assumed that arg decls and member inits are not mixed. + (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))) + (if (= (preceding-char) ?\)) + (progn ; first arg decl or member init + (goto-char indent-point) + (skip-chars-forward " \t") + (if (= (following-char) ?:) + c++-member-init-indent + c-argdecl-indent)) + (if (= (preceding-char) ?\;) + (backward-char 1)) + (if (= (preceding-char) ?}) + 0 + (beginning-of-line) ; continued arg decls or member inits + (skip-chars-forward " \t") + (if (= (following-char) ?:) + (if c++-continued-member-init-offset + (+ (current-indentation) + c++-continued-member-init-offset) + (progn + (forward-char 1) + (skip-chars-forward " \t") + (current-column))) + (current-indentation))) + ))) + ((/= (char-after containing-sexp) ?{) + ;; line is expression, not statement: + ;; indent to just after the surrounding open -- unless + ;; empty arg list, in which case we do what + ;; c++-empty-arglist-indent says to do. + (if (and c++-empty-arglist-indent + (or (null (nth 2 state)) ;; indicates empty arg + ;; list. + ;; Use a heuristic: if the first + ;; non-whitespace following left paren on + ;; same line is not a comment, + ;; is not an empty arglist. + (save-excursion + (goto-char (1+ containing-sexp)) + (not + (looking-at "\\( \\|\t\\)*[^/\n]"))))) + (progn + (goto-char containing-sexp) + (beginning-of-line) + (skip-chars-forward " \t") + (goto-char (min (+ (point) c++-empty-arglist-indent) + (1+ containing-sexp))) + (current-column)) + ;; In C-mode, we would always indent to one after the + ;; left paren. Here, though, we may have an + ;; empty-arglist, so we'll indent to the min of that + ;; and the beginning of the first argument. + (goto-char (1+ containing-sexp)) + (current-column))) + (t + ;; Statement. Find previous non-comment character. + (goto-char indent-point) + (c++-backward-to-noncomment containing-sexp) + (if (not (memq (preceding-char) '(nil ?\, ?\; ?} ?: ?\{))) + ;; 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))) + ;; 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) + (while (progn (skip-chars-forward " \t\n") + (looking-at + (concat + "#\\|/\\*\\|//" + "\\|case[ \t]" + "\\|[a-zA-Z0-9_$]*:[^:]" + "\\|friend[ \t]class[ \t]"))) + ;; Skip over comments and labels following openbrace. + (cond ((= (following-char) ?\#) + (forward-line 1)) + ((looking-at "/\\*") + (search-forward "*/" nil 'move)) + ((looking-at "//\\|friend[ \t]class[ \t]") + (forward-line 1)) + (t + (re-search-forward ":[^:]" nil 'move)))) + ;; The first following code counts + ;; if it is before the line we want to indent. + (and (< (point) indent-point) + (current-column))) + ;; If no previous statement, + ;; indent it relative to line brace is on. + ;; For open brace in column zero, don't let statement + ;; start there too. If c-indent-offset 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 c++-backward-to-noncomment (lim) + (let (opoint stop) + (while (not stop) + (skip-chars-backward " \t\n\r\f" lim) + (setq opoint (point)) + (cond ((and (>= (point) (+ 2 lim)) + (save-excursion + (forward-char -2) + (looking-at "\\*/"))) + (search-backward "/*" lim 'move)) + ((and + (search-backward "//" (max (point-bol) lim) 'move) + (not (within-string-p (point) opoint)))) + (t (beginning-of-line) + (skip-chars-forward " \t") + (if (looking-at "#") + (setq stop (<= (point) lim)) + (setq stop t) + (goto-char opoint))))))) + +(defun indent-c++-exp () + "Indent each line of the C++ grouping following point." + (interactive) + (let ((indent-stack (list nil)) + (contain-stack (list (point))) + (case-fold-search nil) + restart outer-loop-done inner-loop-done state ostate + this-indent last-sexp + at-else at-brace + (opoint (point)) + (next-depth 0)) + (save-excursion + (forward-sexp 1)) + (save-excursion + (setq outer-loop-done nil) + (while (and (not (eobp)) (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 innerloop-done nil) + (while (and (not innerloop-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 (or (nth 4 ostate)) + (c++-indent-line)) + (if (or (nth 3 state)) + (forward-line 1) + (setq innerloop-done t))) + (if (<= next-depth 0) + (setq outer-loop-done t)) + (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") + (if (eolp) + nil + (if (and (car indent-stack) + (>= (car indent-stack) 0)) + ;; Line is on an existing nesting level. + ;; Lines inside parens are handled specially. + (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 at-else (looking-at "else\\W")) + (setq at-brace (= (following-char) ?{)) + (c++-backward-to-noncomment opoint) + (if (not (memq (preceding-char) '(nil ?\, ?\; ?} ?: ?{))) + ;; 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. + (if at-else + (progn (c-backward-to-start-of-if opoint) + (setq this-indent (current-indentation))) + (setq this-indent (car indent-stack)))))) + ;; Just started a new nesting level. + ;; Compute the standard indent for this level. + (let ((val (calculate-c++-indent + (if (car indent-stack) + (- (car indent-stack)))))) + (setcar indent-stack + (setq this-indent val)))) + ;; Adjust line indentation according to its contents + (if (looking-at "\\(public\\|private\\|protected\\):") + (setq this-indent (- this-indent c-indent-level))) + (if (or (looking-at "case[ \t]") + (and (looking-at "[A-Za-z]") + (save-excursion + (forward-sexp 1) + (looking-at ":[^:]")))) + (setq this-indent (max 1 (+ this-indent c-label-offset)))) + (if (looking-at "friend[ \t]class[ \t]") + (setq this-indent (+ this-indent c++-friend-offset))) + (if (= (following-char) ?}) + (setq this-indent (- this-indent c-indent-level))) + (if (= (following-char) ?{) + (setq this-indent (+ this-indent c-brace-offset))) + ;; 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) + (if (re-search-forward comment-start-skip + (save-excursion (end-of-line) + (point)) t) + (progn + (indent-for-comment) + (beginning-of-line)))))))))) + +(defun fill-C-comment () + (interactive) + (save-excursion + (let ((save fill-prefix)) + (beginning-of-line 1) + (save-excursion + (re-search-forward comment-start-skip + (save-excursion (end-of-line) (point)) + t) + (goto-char (match-end 0)) + (set-fill-prefix)) + (while (looking-at fill-prefix) + (previous-line 1)) + (next-line 1) + (insert-string "\n") + (fill-paragraph nil) + (delete-char -1) + (setq fill-prefix save)))) + +(defun point-bol () + "Returns the value of the point at the beginning of the current line." + (save-excursion + (beginning-of-line) + (point))) + +(defun c++-insert-header () + "Insert header denoting C++ code at top of buffer." + (interactive) + (save-excursion + (goto-char (point-min)) + (insert "// " + "This may look like C code, but it is really " + "-*- C++ -*-" + "\n\n"))) + +(defun within-string-p (point1 point2) + "Returns true if number of double quotes between two points is odd." + (let ((s (buffer-substring point1 point2))) + (not (zerop (mod (count-char-in-string ?\" s) 2))))) + +(defun count-char-in-string (c s) + (let ((count 0) + (pos 0)) + (while (< pos (length s)) + (setq count (+ count (if (\= (aref s pos) c) 1 0))) + (setq pos (1+ pos))) + count)) + +;;; This page covers "macroization;" making C++ parameterized types +;;; via macros. + +(defvar c++-default-macroize-column 78 + "Place to insert backslashes.") + +(defun c++-macroize-region (from to arg) + "Insert backslashes at end of every line in region. Useful for defining cpp +macros. If called with negative argument, will remove trailing backslashes, +so that indentation will work right." + (interactive "r\np") + (save-excursion + (goto-char from) + (beginning-of-line 1) + (let ((line (count-lines (point-min) (point))) + (to-line (save-excursion (goto-char to) + (count-lines (point-min) (point))))) + (while (< line to-line) + (backslashify-current-line (> arg 0)) + (next-line 1) (setq line (1+ line)))))) + +(defun backslashify-current-line (doit) + (end-of-line 1) + (cond + (doit + ;; Note that "\\\\" is needed to get one backslash. + (if (not (save-excursion (forward-char -1) (looking-at "\\\\"))) + (progn + (if (>= (current-column) c++-default-macroize-column) + (insert " \\") + (while (<= (current-column) c++-default-macroize-column) + (insert "\t") (end-of-line)) + (delete-char -1) + (while (< (current-column) c++-default-macroize-column) + (insert " ") (end-of-line)) + (insert "\\"))))) + (t + (forward-char -1) + (if (looking-at "\\\\") + (progn (skip-chars-backward " \t") + (kill-line)))))) + + +;;; This page covers commenting out multiple lines. + +(defun c++-comment-region () + "Comment out all lines in a region between mark and current point. +Inserts \"// \" (`comment-start') in front of each line." + (interactive) + (let* ((m (if (eq (mark) nil) (error "Mark is not set!") (mark))) + (start (if (< (point) m) (point) m)) + (end (if (> (point) m) (point) m)) + (mymark (copy-marker end))) + (save-excursion + (goto-char start) + (while (< (point) (marker-position mymark)) + (beginning-of-line) + (insert comment-start) + (beginning-of-line) + (next-line 1))))) + +(defun c++-uncomment-region () + "Uncomment all lines in region between mark and current point. +Deletes the leading \"// \" (`comment-start') from each line, if any." + (interactive) + (let* ((m (if (eq (mark) nil) (error "Mark is not set!") (mark))) + (start (if (< (point) m) (point) m)) + (end (if (> (point) m) (point) m)) + (mymark (copy-marker end)) + (len (length comment-start)) + (char (string-to-char comment-start))) + (save-excursion + (goto-char start) + (while (< (point) (marker-position mymark)) + (beginning-of-line) + (if (looking-at (concat " *" comment-start)) + (progn + (zap-to-char 1 char) + (delete-char len))) + (beginning-of-line) + (next-line 1))))) + +;;; Below are two regular expressions that attempt to match defuns +;;; "strongly" and "weakly." The strong one almost reconstructs the +;;; grammar of C++; the weak one just figures anything id or curly on +;;; the left begins a defun. The constant "c++-match-header-strongly" +;;; determines which to use; the default is the weak one. + +(defvar c++-match-header-strongly nil + "*If nil, use `c++-defun-header-weak' to identify beginning of definitions. +If non-nil, use `c++-defun-header-strong'.") + +(defvar c++-defun-header-strong-struct-equivs "\\(class\\|struct\\|enum\\)" + "Regexp to match names of structure declaration blocks in C++.") + +(defconst c++-defun-header-strong + (let* + (; valid identifiers + ;; There's a real wierdness here -- if I switch the below + (id "\\(\\w\\|_\\)+") + ;; to be + ;; (id "\\(_\\|\\w\\)+") + ;; things no longer work right. Try it and see! + + ; overloadable operators + (op-sym1 + "[---+*/%^&|~!=<>]\\|[---+*/%^&|<>=!]=\\|<<=?\\|>>=?") + (op-sym2 + "&&\\|||\\|\\+\\+\\|--\\|()\\|\\[\\]") + (op-sym (concat "\\(" op-sym1 "\\|" op-sym2 "\\)")) + ; whitespace + (middle "[^\\*]*\\(\\*+[^/\\*][^\\*]*\\)*") + (c-comment (concat "/\\*" middle "\\*+/")) + (wh (concat "\\(\\s \\|\n\\|//.*$\\|" c-comment "\\)")) + (wh-opt (concat wh "*")) + (wh-nec (concat wh "+")) + (oper (concat "\\(" "operator" "\\(" + wh-opt op-sym "\\|" wh-nec id "\\)" "\\)")) + (dcl-list "([^():]*)") + (func-name (concat "\\(" oper "\\|" id "::" id "\\|" id "\\)")) + (inits + (concat "\\(:" + "\\(" wh-opt id "(.*\\()" wh-opt "," "\\)\\)*" + wh-opt id "(.*)" wh-opt "{" + "\\|" wh-opt "{\\)")) + (type-name (concat + "\\(" c++-defun-header-strong-struct-equivs wh-nec "\\)?" + id)) + (type (concat "\\(const" wh-nec "\\)?" + "\\(" type-name "\\|" type-name wh-opt "\\*+" "\\|" + type-name wh-opt "&" "\\)")) + (modifier "\\(inline\\|virtual\\|overload\\|auto\\|static\\)") + (modifiers (concat "\\(" modifier wh-nec "\\)*")) + (func-header + ;; type arg-dcl + (concat modifiers type wh-nec func-name wh-opt dcl-list wh-opt inits)) + (inherit (concat "\\(:" wh-opt "\\(public\\|private\\)?" + wh-nec id "\\)")) + (cs-header (concat + c++-defun-header-strong-struct-equivs + wh-nec id wh-opt inherit "?" wh-opt "{"))) + (concat "^\\(" func-header "\\|" cs-header "\\)")) + "Strongly-defined regexp to match beginning of structure or function def.") + + +;; This part has to do with recognizing defuns. + +;; The weak convention we will use is that a defun begins any time +;; there is a left curly brace, or some identifier on the left margin, +;; followed by a left curly somewhere on the line. (This will also +;; incorrectly match some continued strings, but this is after all +;; just a weak heuristic.) Suggestions for improvement (short of the +;; strong scheme shown above) are welcomed. + +(defconst c++-defun-header-weak "^{\\|^[_a-zA-Z].*{" + "Weakly-defined regexp to match beginning of structure or function def.") + +(defun c++-beginning-of-defun (arg) + (interactive "p") + (let ((c++-defun-header (if c++-match-header-strongly + c++-defun-header-strong + c++-defun-header-weak))) + (cond ((or (= arg 0) (and (> arg 0) (bobp))) nil) + ((and (not (looking-at c++-defun-header)) + (let ((curr-pos (point)) + (open-pos (if (search-forward "{" nil 'move) + (point))) + (beg-pos + (if (re-search-backward c++-defun-header nil 'move) + (match-beginning 0)))) + (if (and open-pos beg-pos + (< beg-pos curr-pos) + (> open-pos curr-pos)) + (progn + (goto-char beg-pos) + (if (= arg 1) t nil));; Are we done? + (goto-char curr-pos) + nil)))) + (t + (if (and (looking-at c++-defun-header) (not (bobp))) + (forward-char (if (< arg 0) 1 -1))) + (and (re-search-backward c++-defun-header nil 'move (or arg 1)) + (goto-char (match-beginning 0))))))) + + +(defun c++-end-of-defun (arg) + (interactive "p") + (let ((c++-defun-header (if c++-match-header-strongly + c++-defun-header-strong + c++-defun-header-weak))) + (if (and (eobp) (> arg 0)) + nil + (if (and (> arg 0) (looking-at c++-defun-header)) (forward-char 1)) + (let ((pos (point))) + (c++-beginning-of-defun + (if (< arg 0) + (- (- arg (if (eobp) 0 1))) + arg)) + (if (and (< arg 0) (bobp)) + t + (if (re-search-forward c++-defun-header nil 'move) + (progn (forward-char -1) + (forward-sexp) + (beginning-of-line 2))) + (if (and (= pos (point)) + (re-search-forward c++-defun-header nil 'move)) + (c++-end-of-defun 1)))) + t))) + +(defun c++-indent-defun () + "Indents the current function definition, struct or class declaration." + (interactive) + (let ((restore (point))) + (c++-end-of-defun 1) + (beginning-of-line 1) + (let ((end (point))) + (c++-beginning-of-defun 1) + (while (<= (point) end) + (c++-indent-line) + (next-line 1) + (beginning-of-line 1))) + (goto-char restore))) |