lisp-mode.el

早期freebsd实现

          last-sexp containing-sexp)
      (if parse-start
          (goto-char parse-start)
          (beginning-of-defun))
      ;; Find outermost containing sexp
      (while (< (point) indent-point)
        (setq state (parse-partial-sexp (point) indent-point 0)))
      ;; Find innermost containing sexp
      (while (and retry
		  state
                  (> (setq paren-depth (elt state 0)) 0))
        (setq retry nil)
        (setq last-sexp (elt state 2))
        (setq containing-sexp (elt state 1))
        ;; Position following last unclosed open.
        (goto-char (1+ containing-sexp))
        ;; Is there a complete sexp since then?
        (if (and last-sexp (> last-sexp (point)))
            ;; Yes, but is there a containing sexp after that?
            (let ((peek (parse-partial-sexp last-sexp indent-point 0)))
              (if (setq retry (car (cdr peek))) (setq state peek)))))
      (if retry
          nil
        ;; Innermost containing sexp found
        (goto-char (1+ containing-sexp))
        (if (not last-sexp)
	    ;; indent-point immediately follows open paren.
	    ;; Don't call hook.
            (setq desired-indent (current-column))
	  ;; Find the start of first element of containing sexp.
	  (parse-partial-sexp (point) last-sexp 0 t)
	  (cond ((looking-at "\\s(")
		 ;; First element of containing sexp is a list.
		 ;; Indent under that list.
		 )
		((> (save-excursion (forward-line 1) (point))
		    last-sexp)
		 ;; This is the first line to start within the containing sexp.
		 ;; It's almost certainly a function call.
		 (if (= (point) last-sexp)
		     ;; Containing sexp has nothing before this line
		     ;; except the first element.  Indent under that element.
		     nil
		   ;; Skip the first element, find start of second (the first
		   ;; argument of the function call) and indent under.
		   (progn (forward-sexp 1)
			  (parse-partial-sexp (point) last-sexp 0 t)))
		 (backward-prefix-chars))
		(t
		 ;; Indent beneath first sexp on same line as last-sexp.
		 ;; Again, it's almost certainly a function call.
		 (goto-char last-sexp)
		 (beginning-of-line)
		 (parse-partial-sexp (point) last-sexp 0 t)
		 (backward-prefix-chars)))))
      ;; Point is at the point to indent under unless we are inside a string.
      ;; Call indentation hook except when overriden by lisp-indent-offset
      ;; or if the desired indentation has already been computed.
      (let ((normal-indent (current-column)))
        (cond ((elt state 3)
               ;; Inside a string, don't change indentation.
               (goto-char indent-point)
               (skip-chars-forward " \t")
               (current-column))
              ((and (integerp lisp-indent-offset) containing-sexp)
               ;; Indent by constant offset
               (goto-char containing-sexp)
               (+ normal-indent lisp-indent-offset))
              (desired-indent)
              ((and (boundp 'lisp-indent-hook)
                    lisp-indent-hook
                    (not retry))
               (or (funcall lisp-indent-hook indent-point state)
                   normal-indent))
              (t
               normal-indent))))))

(defun lisp-indent-hook (indent-point state)
  (let ((normal-indent (current-column)))
    (goto-char (1+ (elt state 1)))
    (parse-partial-sexp (point) last-sexp 0 t)
    (if (and (elt state 2)
             (not (looking-at "\\sw\\|\\s_")))
        ;; car of form doesn't seem to be a a symbol
        (progn
          (if (not (> (save-excursion (forward-line 1) (point))
                      last-sexp))
              (progn (goto-char last-sexp)
                     (beginning-of-line)
                     (parse-partial-sexp (point) last-sexp 0 t)))
          ;; Indent under the list or under the first sexp on the
          ;; same line as last-sexp.  Note that first thing on that
          ;; line has to be complete sexp since we are inside the
          ;; innermost containing sexp.
          (backward-prefix-chars)
          (current-column))
      (let ((function (buffer-substring (point)
					(progn (forward-sexp 1) (point))))
	    method)
	(setq method (get (intern-soft function) 'lisp-indent-hook))
	(cond ((or (eq method 'defun)
		   (and (null method)
			(> (length function) 3)
			(string-match "\\`def" function)))
	       (lisp-indent-defform state indent-point))
	      ((integerp method)
	       (lisp-indent-specform method state
				     indent-point normal-indent))
	      (method
		(funcall method state indent-point)))))))

(defconst lisp-body-indent 2 "")

(defun lisp-indent-specform (count state indent-point normal-indent)
  (let ((containing-form-start (elt state 1))
        (i count)
        body-indent containing-form-column)
    ;; Move to the start of containing form, calculate indentation
    ;; to use for non-distinguished forms (> count), and move past the
    ;; function symbol.  lisp-indent-hook guarantees that there is at
    ;; least one word or symbol character following open paren of containing
    ;; form.
    (goto-char containing-form-start)
    (setq containing-form-column (current-column))
    (setq body-indent (+ lisp-body-indent containing-form-column))
    (forward-char 1)
    (forward-sexp 1)
    ;; Now find the start of the last form.
    (parse-partial-sexp (point) indent-point 1 t)
    (while (and (< (point) indent-point)
                (condition-case ()
                    (progn
                      (setq count (1- count))
                      (forward-sexp 1)
                      (parse-partial-sexp (point) indent-point 1 t))
                  (error nil))))
    ;; Point is sitting on first character of last (or count) sexp.
    (if (> count 0)
        ;; A distinguished form.  If it is the first or second form use double
        ;; lisp-body-indent, else normal indent.  With lisp-body-indent bound
        ;; to 2 (the default), this just happens to work the same with if as
        ;; the older code, but it makes unwind-protect, condition-case,
        ;; with-output-to-temp-buffer, et. al. much more tasteful.  The older,
        ;; less hacked, behavior can be obtained by replacing below with
        ;; (list normal-indent containing-form-start).
        (if (<= (- i count) 1)
            (list (+ containing-form-column (* 2 lisp-body-indent))
                  containing-form-start)
            (list normal-indent containing-form-start))
      ;; A non-distinguished form.  Use body-indent if there are no
      ;; distinguished forms and this is the first undistinguished form,
      ;; or if this is the first undistinguished form and the preceding
      ;; distinguished form has indentation at least as great as body-indent.
      (if (or (and (= i 0) (= count 0))
              (and (= count 0) (<= body-indent normal-indent)))
          body-indent
          normal-indent))))

(defun lisp-indent-defform (state indent-point)
  (goto-char (car (cdr state)))
  (forward-line 1)
  (if (> (point) (car (cdr (cdr state))))
      (progn
	(goto-char (car (cdr state)))
	(+ lisp-body-indent (current-column)))))


;; (put 'progn 'lisp-indent-hook 0), say, causes progn to be indented
;; like defun if the first form is placed on the next line, otherwise
;; it is indented like any other form (i.e. forms line up under first).

(put 'lambda 'lisp-indent-hook 'defun)
(put 'progn 'lisp-indent-hook 0)
(put 'prog1 'lisp-indent-hook 1)
(put 'save-excursion 'lisp-indent-hook 0)
(put 'save-window-excursion 'lisp-indent-hook 0)
(put 'save-restriction 'lisp-indent-hook 0)
(put 'let 'lisp-indent-hook 1)
(put 'let* 'lisp-indent-hook 1)
(put 'while 'lisp-indent-hook 1)
(put 'if 'lisp-indent-hook 2)
(put 'catch 'lisp-indent-hook 1)
(put 'condition-case 'lisp-indent-hook 2)
(put 'unwind-protect 'lisp-indent-hook 1)
(put 'with-output-to-temp-buffer 'lisp-indent-hook 1)

(defun indent-sexp ()
  "Indent each line of the list starting just after point."
  (interactive)
  (let ((indent-stack (list nil)) (next-depth 0) bol
	outer-loop-done inner-loop-done state this-indent)
    ;; Get error now if we don't have a complete sexp after point.
    (save-excursion (forward-sexp 1))
    (save-excursion
      (setq outer-loop-done nil)
      (while (not outer-loop-done)
	(setq last-depth next-depth
	      inner-loop-done nil)
	;; Parse this line so we can learn the state
	;; to indent the next line.
	;; This inner loop goes through only once
	;; unless a line ends inside a string.
	(while (and (not inner-loop-done)
		    (not (setq outer-loop-done (eobp))))
	  (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
					  nil nil state))
	  (setq next-depth (car state))
	  ;; If the line contains a comment other than the sort
	  ;; that is indented like code,
	  ;; indent it now with indent-for-comment.
	  ;; Comments indented like code are right already.
	  ;; In any case clear the in-comment flag in the state
	  ;; because parse-partial-sexp never sees the newlines.
	  (if (car (nthcdr 4 state))
	      (progn (indent-for-comment)
		     (end-of-line)
		     (setcar (nthcdr 4 state) nil)))
	  ;; If this line ends inside a string,
	  ;; go straight to next line, remaining within the inner loop,
	  ;; and turn off the \-flag.
	  (if (car (nthcdr 3 state))
	      (progn
		(forward-line 1)
		(setcar (nthcdr 5 state) nil))
	    (setq inner-loop-done t)))
	(if (or outer-loop-done (setq outer-loop-done (<= next-depth 0)))
	    nil
	  (while (> last-depth next-depth)
	    (setq indent-stack (cdr indent-stack)
		  last-depth (1- last-depth)))
	  (while (< last-depth next-depth)
	    (setq indent-stack (cons nil indent-stack)
		  last-depth (1+ last-depth)))
	  ;; Now go to the next line and indent it according
	  ;; to what we learned from parsing the previous one.
	  (forward-line 1)
	  (setq bol (point))
	  (skip-chars-forward " \t")
	  ;; But not if the line is blank, or just a comment
	  ;; (except for double-semi comments; indent them as usual).
	  (if (or (eobp) (looking-at "[;\n]"))
	      nil
	    (if (and (car indent-stack)
		     (>= (car indent-stack) 0))
		(setq this-indent (car indent-stack))
	      (let ((val (calculate-lisp-indent
			  (if (car indent-stack) (- (car indent-stack))))))
		(if (integerp val)
		    (setcar indent-stack
			    (setq this-indent val))
		  (setcar indent-stack (- (car (cdr val))))
		  (setq this-indent (car val)))))
	    (if (/= (current-column) this-indent)
		(progn (delete-region bol (point))
		       (indent-to this-indent)))))))))

(defun indent-code-rigidly (start end arg &optional nochange-regexp)
  "Indent all lines of code, starting in the region, sideways by ARG columns.
Does not affect lines starting inside comments or strings,
assuming that the start of the region is not inside them.
Called from a program, takes args START, END, COLUMNS and NOCHANGE-REGEXP.
The last is a regexp which, if matched at the beginning of a line,
means don't indent that line."
  (interactive "r\np")
  (let (state)
    (save-excursion
      (goto-char end)
      (setq end (point-marker))
      (goto-char start)
      (or (bolp)
	  (setq state (parse-partial-sexp (point)
					  (progn
					    (forward-line 1) (point))
					  nil nil state)))
      (while (< (point) end)
	(or (car (nthcdr 3 state))
	    (and nochange-regexp
		 (looking-at nochange-regexp))
	    ;; If line does not start in string, indent it
	    (let ((indent (current-indentation)))
	      (delete-region (point) (progn (skip-chars-forward " \t") (point)))
	      (or (eolp)
		  (indent-to (max 0 (+ indent arg)) 0))))
	(setq state (parse-partial-sexp (point)
					(progn
					  (forward-line 1) (point))
					nil nil state))))))