fortran.el

早期freebsd实现

    (goto-char save-point)
    (set-marker end-region-mark nil)
    (set-marker save-point nil)))

(defun fortran-abbrev-start ()
  "Typing \";\\[help-command]\" or \";?\" lists all the fortran abbrevs. 
Any other key combination is executed normally." ;\\[help-command] is just a way to print the value of the variable help-char.
  (interactive)
  (let (c)
    (insert last-command-char)
    (if (or (= (setq c (read-char)) ??)	;insert char if not equal to `?'
	    (= c help-char))
	(fortran-abbrev-help)
      (setq unread-command-char c))))

(defun fortran-abbrev-help ()
  "List the currently defined abbrevs in Fortran mode."
  (interactive)
  (message "Listing abbrev table...")
  (require 'abbrevlist)
  (list-one-abbrev-table fortran-mode-abbrev-table "*Help*")
  (message "Listing abbrev table...done"))

(defun fortran-column-ruler ()
  "Inserts a column ruler momentarily above current line, till next keystroke.
The ruler is defined by the value of fortran-column-ruler.
The key typed is executed unless it is SPC."
  (interactive)
  (momentary-string-display 
   fortran-column-ruler (save-excursion (beginning-of-line) (point))
   nil "Type SPC or any command to erase ruler."))

(defun fortran-window-create ()
  "Makes the window 72 columns wide."
  (interactive)
  (let ((window-min-width 2))
    (split-window-horizontally 73))
  (other-window 1)
  (switch-to-buffer " fortran-window-extra" t)
  (select-window (previous-window)))

(defun fortran-split-line ()
  "Break line at point and insert continuation marker and alignment."
  (interactive)
  (delete-horizontal-space)
  (if (save-excursion (beginning-of-line) (looking-at comment-line-start-skip))
      (insert "\n" comment-line-start " ")
    (insert "\n " fortran-continuation-char))
  (fortran-indent-line))

(defun delete-horizontal-regexp (chars)
  "Delete all characters in CHARS around point.
CHARS is like the inside of a [...] in a regular expression
except that ] is never special and \ quotes ^, - or \."
  (interactive "*s")
  (skip-chars-backward chars)
  (delete-region (point) (progn (skip-chars-forward chars) (point))))

(defun fortran-electric-line-number (arg)
  "Self insert, but if part of a Fortran line number indent it automatically.
Auto-indent does not happen if a numeric arg is used."
  (interactive "P")
  (if (or arg (not fortran-electric-line-number))
      (self-insert-command arg)
    (if (or (save-excursion (re-search-backward "[^ \t0-9]"
						(save-excursion
						  (beginning-of-line)
						  (point))
						t)) ;not a line number
	    (looking-at "[0-9]"))		;within a line number
	(insert last-command-char)
      (skip-chars-backward " \t")
      (insert last-command-char)
      (fortran-indent-line))))

(defun beginning-of-fortran-subprogram ()
  "Moves point to the beginning of the current fortran subprogram."
  (interactive)
  (let ((case-fold-search t))
    (beginning-of-line -1)
    (re-search-backward "^[ \t0-9]*end\\b[ \t]*[^ \t=(a-z]" nil 'move)
    (if (looking-at "^[ \t0-9]*end\\b[ \t]*[^ \t=(a-z]")
	(forward-line 1))))

(defun end-of-fortran-subprogram ()
  "Moves point to the end of the current fortran subprogram."
  (interactive)
  (let ((case-fold-search t))
    (beginning-of-line 2)
    (re-search-forward "^[ \t0-9]*end\\b[ \t]*[^ \t=(a-z]" nil 'move)
    (goto-char (match-beginning 0))
    (forward-line 1)))

(defun mark-fortran-subprogram ()
  "Put mark at end of fortran subprogram, point at beginning. 
The marks are pushed."
  (interactive)
  (end-of-fortran-subprogram)
  (push-mark (point))
  (beginning-of-fortran-subprogram))
  
(defun fortran-previous-statement ()
  "Moves point to beginning of the previous fortran statement.
Returns 'first-statement if that statement is the first
non-comment Fortran statement in the file, and nil otherwise."
  (interactive)
  (let (not-first-statement continue-test)
    (beginning-of-line)
    (setq continue-test
	  (or (looking-at
	        (concat "[ \t]*" (regexp-quote (char-to-string
						 fortran-continuation-char))))
	      (looking-at "     [^ 0\n]")))
    (while (and (setq not-first-statement (= (forward-line -1) 0))
		(or (looking-at comment-line-start-skip)
		    (looking-at "[ \t]*$")
		    (looking-at "     [^ 0\n]")
		    (looking-at (concat "[ \t]*"  comment-start-skip)))))
    (cond ((and continue-test
		(not not-first-statement))
	   (message "Incomplete continuation statement."))
	  (continue-test	
	   (fortran-previous-statement))
	  ((not not-first-statement)
	   'first-statement))))

(defun fortran-next-statement ()
  "Moves point to beginning of the next fortran statement.
 Returns 'last-statement if that statement is the last
 non-comment Fortran statement in the file, and nil otherwise."
  (interactive)
  (let (not-last-statement)
    (beginning-of-line)
    (while (and (setq not-last-statement (= (forward-line 1) 0))
 		(or (looking-at comment-line-start-skip)
 		    (looking-at "[ \t]*$")
 		    (looking-at "     [^ 0\n]")
 		    (looking-at (concat "[ \t]*"  comment-start-skip)))))
    (if (not not-last-statement)
 	'last-statement)))

(defun fortran-indent-line ()
  "Indents current fortran line based on its contents and on previous lines."
  (interactive)
  (let ((cfi (calculate-fortran-indent)))
    (save-excursion
      (beginning-of-line)
      (if (or (not (= cfi (fortran-current-line-indentation)))
	      (and (re-search-forward "^[ \t]*[0-9]+" (+ (point) 4) t)
		   (not (fortran-line-number-indented-correctly-p))))
	  (fortran-indent-to-column cfi)
	(beginning-of-line)
	(if (re-search-forward comment-start-skip
			       (save-excursion (end-of-line) (point)) 'move)
	    (fortran-indent-comment))))
    ;; Never leave point in left margin.
    (if (< (current-column) cfi)
	(move-to-column cfi))))

(defun fortran-indent-subprogram ()
  "Properly indents the Fortran subprogram which contains point."
  (interactive)
  (save-excursion
    (mark-fortran-subprogram)
    (message "Indenting subprogram...")
    (indent-region (point) (mark) nil))
  (message "Indenting subprogram...done."))

(defun calculate-fortran-indent ()
  "Calculates the fortran indent column based on previous lines."
  (let (icol first-statement (case-fold-search t))
    (save-excursion
      (setq first-statement (fortran-previous-statement))
      (if first-statement
	  (setq icol fortran-minimum-statement-indent)
	(progn
	  (if (= (point) (point-min))
	      (setq icol fortran-minimum-statement-indent)
	    (setq icol (fortran-current-line-indentation)))
	  (skip-chars-forward " \t0-9")
	  (cond ((looking-at "if[ \t]*(")
		 (if (or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
			 (let (then-test)	;multi-line if-then
			   (while (and (= (forward-line 1) 0) ;search forward for then
				       (looking-at "     [^ 0]")
				       (not (setq then-test (looking-at ".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
			   then-test))
		     (setq icol (+ icol fortran-if-indent))))
		((looking-at "\\(else\\|elseif\\)\\b")
		 (setq icol (+ icol fortran-if-indent)))
		((looking-at "do\\b")
		 (setq icol (+ icol fortran-do-indent)))))))
    (save-excursion
      (beginning-of-line)
      (cond ((looking-at "[ \t]*$"))
	    ((looking-at comment-line-start-skip)
	     (cond ((eq fortran-comment-indent-style 'relative)
		    (setq icol (+ icol fortran-comment-line-column)))
		   ((eq fortran-comment-indent-style 'fixed)
		    (setq icol fortran-comment-line-column))))
	    ((or (looking-at (concat "[ \t]*"
				     (regexp-quote (char-to-string fortran-continuation-char))))
		 (looking-at "     [^ 0\n]"))
	     (setq icol (+ icol fortran-continuation-indent)))
	    (first-statement)
	    ((and fortran-check-all-num-for-matching-do
		  (looking-at "[ \t]*[0-9]+")
		  (fortran-check-for-matching-do))
	     (setq icol (- icol fortran-do-indent)))
	    (t
	     (skip-chars-forward " \t0-9")
	     (cond ((looking-at "end[ \t]*if\\b")
		    (setq icol (- icol fortran-if-indent)))
		   ((looking-at "\\(else\\|elseif\\)\\b")
		    (setq icol (- icol fortran-if-indent)))
		   ((and (looking-at "continue\\b")
			 (fortran-check-for-matching-do))
		    (setq icol (- icol fortran-do-indent)))
		   ((looking-at "end[ \t]*do\\b")
		    (setq icol (- icol fortran-do-indent)))
		   ((and (looking-at "end\\b[ \t]*[^ \t=(a-z]")
			 (not (= icol fortran-minimum-statement-indent)))
 		    (message "Warning: `end' not in column %d.  Probably an unclosed block." fortran-minimum-statement-indent))))))
    (max fortran-minimum-statement-indent icol)))

(defun fortran-current-line-indentation ()
  "Indentation of current line, ignoring Fortran line number or continuation.
This is the column position of the first non-whitespace character
aside from the line number and/or column 5 line-continuation character.
For comment lines, returns indentation of the first
non-indentation text within the comment."
  (save-excursion
    (beginning-of-line)
    (cond ((looking-at comment-line-start-skip)
	   (goto-char (match-end 0))
	   (skip-chars-forward
	     (if (stringp fortran-comment-indent-char)
		 fortran-comment-indent-char
	         (char-to-string fortran-comment-indent-char))))
	  ((looking-at "     [^ 0\n]")
	   (goto-char (match-end 0)))
	  (t
	   ;; Move past line number.
	   (move-to-column 5)))
    ;; Move past whitespace.
    (skip-chars-forward " \t")
    (current-column)))

(defun fortran-indent-to-column (col)
  "Indents current line with spaces to column COL.
notes: 1) A non-zero/non-blank character in column 5 indicates a continuation
          line, and this continuation character is retained on indentation;
       2) If fortran-continuation-char is the first non-whitespace character,
          this is a continuation line;
       3) A non-continuation line which has a number as the first
          non-whitespace character is a numbered line."
  (save-excursion
    (beginning-of-line)
    (if (looking-at comment-line-start-skip)
	(if fortran-comment-indent-style
	    (let ((char (if (stringp fortran-comment-indent-char)
			    (aref fortran-comment-indent-char 0)
			    fortran-comment-indent-char)))
	      (goto-char (match-end 0))
	      (delete-horizontal-regexp (concat " \t" (char-to-string char)))
	      (insert-char char (- col (current-column)))))
      (if (looking-at "     [^ 0\n]")
	  (forward-char 6)
	(delete-horizontal-space)
	;; Put line number in columns 0-4
	;; or put continuation character in column 5.
	(cond ((eobp))
	      ((= (following-char) fortran-continuation-char)
	       (indent-to 5)
	       (forward-char 1))
	      ((looking-at "[0-9]+")
	       (let ((extra-space (- 5 (- (match-end 0) (point)))))
		 (if (< extra-space 0)
		     (message "Warning: line number exceeds 5-digit limit.")
		   (indent-to (min fortran-line-number-indent extra-space))))
	       (skip-chars-forward "0-9"))))
      ;; Point is now after any continuation character or line number.
      ;; Put body of statement where specified.
      (delete-horizontal-space)
      (indent-to col)
      ;; Indent any comment following code on the same line.
      (if (re-search-forward comment-start-skip
			     (save-excursion (end-of-line) (point)) t)
	  (progn (goto-char (match-beginning 0))
		 (if (not (= (current-column) (fortran-comment-hook)))
		     (progn (delete-horizontal-space)
			    (indent-to (fortran-comment-hook)))))))))

(defun fortran-line-number-indented-correctly-p ()
  "Return t if current line's line number is correctly indente.
Do not call if there is no line number."
  (save-excursion
    (beginning-of-line)
    (skip-chars-forward " \t")
    (and (<= (current-column) fortran-line-number-indent)
	 (or (= (current-column) fortran-line-number-indent)
	     (progn (skip-chars-forward "0-9")
		    (= (current-column) 5))))))

(defun fortran-check-for-matching-do ()
  "When called from a numbered statement, returns t
 if matching 'do' is found, and nil otherwise."
  (let (charnum
	(case-fold-search t))
    (save-excursion
      (beginning-of-line)
      (if (looking-at "[ \t]*[0-9]+")
	  (progn
	    (skip-chars-forward " \t")
	    (skip-chars-forward "0") ;skip past leading zeros
	    (setq charnum (buffer-substring (point)
					    (progn (skip-chars-forward "0-9")
						   (point))))
	    (beginning-of-line)
	    (and (re-search-backward
		  (concat "\\(^[ \t0-9]*end\\b[ \t]*[^ \t=(a-z]\\)\\|\\(^[ \t0-9]*do[ \t]*0*"
			  charnum "\\b\\)\\|\\(^[ \t]*0*" charnum "\\b\\)")
		  nil t)
		 (looking-at (concat "^[ \t0-9]*do[ \t]*0*" charnum))))))))