Function: beginning-of-defun-raw

beginning-of-defun-raw is an interactive and byte-compiled function defined in lisp.el.gz.

Signature

(beginning-of-defun-raw &optional ARG)

Documentation

Move point to the character that starts a defun.

This is identical to function beginning-of-defun, except that point does not move to the beginning of the line when defun-prompt-regexp is non-nil.

If variable beginning-of-defun-function is non-nil, its value is called as a function to find the defun's beginning.

Key Bindings

Source Code

;; Defined in /usr/src/emacs/lisp/emacs-lisp/lisp.el.gz
(defun beginning-of-defun-raw (&optional arg)
  "Move point to the character that starts a defun.
This is identical to function `beginning-of-defun', except that point
does not move to the beginning of the line when `defun-prompt-regexp'
is non-nil.

If variable `beginning-of-defun-function' is non-nil, its value
is called as a function to find the defun's beginning."
  (interactive "^p")   ; change this to "P", maybe, if we ever come to pass ARG
                      ; to beginning-of-defun-function.
  (unless arg (setq arg 1))
  (cond
   (beginning-of-defun-function
    (condition-case nil
        (funcall beginning-of-defun-function arg)
      ;; We used to define beginning-of-defun-function as taking no argument
      ;; but that makes it impossible to implement correct forward motion:
      ;; we used to use end-of-defun for that, but it's not supposed to do
      ;; the same thing (it moves to the end of a defun not to the beginning
      ;; of the next).
      ;; In case the beginning-of-defun-function uses the old calling
      ;; convention, fallback on the old implementation.
      (wrong-number-of-arguments
       (if (> arg 0)
           (dotimes (_ arg)
             (funcall beginning-of-defun-function))
	 (dotimes (_ (- arg))
	   (funcall end-of-defun-function))))))

   ((or defun-prompt-regexp open-paren-in-column-0-is-defun-start)
    (and (< arg 0) (not (eobp)) (forward-char 1))
    (and (let (found)
           (while
               (and (setq found
                          (re-search-backward
                           (if defun-prompt-regexp
			       (concat (if open-paren-in-column-0-is-defun-start
					   "^\\s(\\|" "")
				       "\\(?:" defun-prompt-regexp "\\)\\s(")
			     "^\\s(")
                                              nil 'move arg))
                    (nth 8 (syntax-ppss))))
           found)
	 (progn (goto-char (1- (match-end 0)))
                t)))

   ;; If open-paren-in-column-0-is-defun-start and defun-prompt-regexp
   ;; are both nil, column 0 has no significance - so scan forward
   ;; from BOB to see how nested point is, then carry on from there.
   ;;
   ;; It is generally not a good idea to land up here, because the
   ;; call to scan-lists below can be extremely slow.  This is because
   ;; back_comment in syntax.c may have to scan from bob to find the
   ;; beginning of each comment.  Fixing this is not trivial -- cyd.

   ((eq arg 0))
   (t
    (let ((floor (point-min))
	  (ceiling (point-max))
	  (arg-+ve (> arg 0)))
      (save-restriction
	(widen)
	(let ((ppss (with-suppressed-warnings ((obsolete syntax-begin-function))
                      (let (syntax-begin-function)
                        (syntax-ppss))))
	      ;; position of least enclosing paren, or nil.
	      encl-pos)
	  ;; Back out of any comment/string, so that encl-pos will always
	  ;; become nil if we're at top-level.
	  (when (nth 8 ppss)
	    (goto-char (nth 8 ppss))
	    (setq ppss (syntax-ppss)))	; should be fast, due to cache.
	  (setq encl-pos (syntax-ppss-toplevel-pos ppss))
	  (if encl-pos (goto-char encl-pos))

	  (and encl-pos arg-+ve (setq arg (1- arg)))
	  (and (not encl-pos) (not arg-+ve) (not (looking-at "\\s("))
	       (setq arg (1+ arg)))

	  (condition-case nil   ; to catch crazy parens.
	      (progn
		(goto-char (scan-lists (point) (- arg) 0))
		(if arg-+ve
		    (if (>= (point) floor)
			t
		      (goto-char floor)
		      nil)
		  ;; forward to next (, or trigger the c-c
		  (goto-char (1- (scan-lists (point) 1 -1)))
		  (if (<= (point) ceiling)
		      t
		    (goto-char ceiling)
		    nil)))
	    (error
	     (goto-char (if arg-+ve floor ceiling))
	     nil))))))))