;;; fortran.el --- Fortran mode for GNU Emacs
-;; Copyright (c) 1986, 93, 94, 95, 97, 98, 99, 2000, 2001
-;; Free Software Foundation, Inc.
+;; Copyright (C) 1986, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
+;; 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
;; Author: Michael D. Prange <prange@erl.mit.edu>
;; Maintainer: Glenn Morris <gmorris@ast.cam.ac.uk>
;; 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.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
(eval-when-compile ; silence compiler
(defvar dabbrev-case-fold-search)
+ (defvar font-lock-syntactic-keywords)
+ (defvar gud-find-expr-function)
(defvar imenu-case-fold-search)
(defvar imenu-syntax-alist))
:group 'fortran-indent)
(defcustom fortran-if-indent 3
- "*Extra indentation applied to IF blocks."
+ "*Extra indentation applied to IF, SELECT CASE and WHERE blocks."
:type 'integer
:group 'fortran-indent)
"*Regexp to match a directive line.
The matching text will be fontified with `font-lock-keyword-face'.
The matching line will be given zero indentation."
- :version "21.4"
+ :version "22.1"
:type 'regexp
:group 'fortran-indent)
(defcustom fortran-break-before-delimiters t
"*Non-nil causes filling to break lines before delimiters.
-Delimiters are whitespace, commas, quotes, and operators."
+Delimiters are characters matching the regexp `fortran-break-delimiters-re'."
:type 'boolean
:group 'fortran)
+(defconst fortran-break-delimiters-re "[-+*/><=, \t]"
+ "Regexp matching delimiter characters at which lines may be broken.
+There are certain tokens comprised entirely of characters
+matching this regexp that should not be split, and these are
+specified by the constant `fortran-no-break-re'.")
+
+;; The ">=", etc F77 extensions are supported by g77.
+(defconst fortran-no-break-re
+ (regexp-opt '("**" "//" "=>" ">=" "<=" "==" "/=") 'paren)
+ "Regexp specifying where not to break lines when filling.
+This regexp matches certain tokens comprised entirely of
+characters matching the regexp `fortran-break-delimiters-re' that should
+not be split by filling. Each element is assumed to be two
+characters long.")
+
(defcustom fortran-mode-hook nil
"Hook run when entering Fortran mode."
:type 'hook
"while" "inquire" "stop" "return"
"include" "open" "close" "read"
"write" "format" "print" "select" "case"
- "cycle" "exit" "rewind" "backspace")
+ "cycle" "exit" "rewind" "backspace"
+ "where" "elsewhere")
'paren) "\\>")
;; Builtin operators.
(concat "\\." (regexp-opt
fortran-font-lock-keywords-2)))
"Gaudy level highlighting for Fortran mode.")
+(defvar fortran-font-lock-keywords-4
+ (append fortran-font-lock-keywords-3
+ (list (list
+ (concat "\\<"
+ (regexp-opt
+ '("int" "ifix" "idint" "real" "float" "sngl"
+ "dble" "cmplx" "ichar" "char" "aint" "dint"
+ "anint" "dnint" "nint" "idnint" "iabs" "abs"
+ "dabs" "cabs" "mod" "amod" "dmod" "isign"
+ "sign" "dsign" "idim" "dim" "ddim" "dprod"
+ "max" "max0" "amax1" "dmax1" "amax0" "max1"
+ "min0" "amin1" "dmin1" "amin0" "min1" "len"
+ "index" "lge" "lgt" "lle" "llt" "aimag"
+ "conjg" "sqrt" "dsqrt" "csqrt" "exp" "dexp"
+ "cexp" "log" "alog" "dlog" "clog" "log10"
+ "alog10" "dlog10" "sin" "dsin" "csin" "cos"
+ "dcos" "ccos" "tan" "dtan" "asin" "dasin"
+ "acos" "dacos" "atan" "datan" "atan2" "datan2"
+ "sinh" "dsinh" "cosh" "dcosh" "tanh" "dtanh")
+ 'paren) "[ \t]*(") '(1 font-lock-builtin-face))))
+ "Maximum highlighting for Fortran mode.
+Consists of level 3 plus all other intrinsics not already highlighted.")
+
;; Comments are real pain in Fortran because there is no way to
;; represent the standard comment syntax in an Emacs syntax table.
;; (We can do so for F90-style). Therefore an unmatched quote in a
'(nil "^\\s-+\\(block\\s-*data\\)\\s-*$" 1))
"Value for `imenu-generic-expression' in Fortran mode.")
+\f
+;; Hideshow support.
+(defconst fortran-blocks-re
+ (concat "block[ \t]*data\\|select[ \t]*case\\|"
+ (regexp-opt '("do" "if" "interface" "function" "map" "program"
+ "structure" "subroutine" "union" "where")))
+ "Regexp potentially indicating the start or end of a Fortran \"block\".
+Omits naked END statements, and DO-loops closed by anything other
+than ENDDO.")
+
+(defconst fortran-end-block-re
+ ;; Do-loops terminated by things other than ENDDO cannot be handled
+ ;; with a regexp. This omission does not seem to matter to hideshow...
+ (concat "^[ \t0-9]*\\<end[ \t]*\\("
+ fortran-blocks-re
+ ;; Naked END statement.
+ "\\|!\\|$\\)")
+ "Regexp matching the end of a Fortran \"block\", from the line start.
+Note that only ENDDO is handled for the end of a DO-loop. Used
+in the Fortran entry in `hs-special-modes-alist'.")
+
+(defconst fortran-start-block-re
+ (concat
+ "^[ \t0-9]*\\(" ; statement number
+ ;; Structure label for DO, IF, SELECT, WHERE.
+ "\\(\\(\\sw+[ \t]*:[ \t]*\\)?"
+ ;; IF blocks are a nuisance:
+ ;; IF ( ... ) foo is not a block, but a single statement.
+ ;; IF ( ... ) THEN can be split over multiple lines.
+ ;; [So can, eg, a DO WHILE (... ), but that is less common, I hope.]
+ ;; The regexp below allows for it to be split over at most 2 lines.
+ ;; That leads to the problem of not matching two consecutive IF
+ ;; statements as one, eg:
+ ;; IF ( ... ) foo
+ ;; IF ( ... ) THEN
+ ;; It simply is not possible to do this in a 100% correct fashion
+ ;; using a regexp - see the functions fortran-end-if,
+ ;; fortran-beginning-if for the hoops we have to go through.
+ ;; An alternative is to match on THEN at a line end, eg:
+ ;; ".*)[ \t]*then[ \t]*\\($\\|!\\)"
+ ;; This would also match ELSE branches, though. This does not seem
+ ;; right to me, because then one has neighbouring blocks that are
+ ;; not nested in each other.
+ "\\(if[ \t]*(\\(.*\\|"
+ ".*\n\\([^if]*\\([^i].\\|.[^f]\\|.\\>\\)\\)\\)\\<then\\|"
+ "do\\|select[ \t]*case\\|where\\)\\)\\|"
+ (regexp-opt '("interface" "function" "map" "program"
+ "structure" "subroutine" "union"))
+ "\\|block[ \t]*data\\)[ \t]*")
+ "Regexp matching the start of a Fortran \"block\", from the line start.
+A simple regexp cannot do this in fully correct fashion, so this
+tries to strike a compromise between complexity and flexibility.
+Used in the Fortran entry in `hs-special-modes-alist'.")
+
+(add-to-list 'hs-special-modes-alist
+ `(fortran-mode ,fortran-start-block-re ,fortran-end-block-re
+ "^[cC*!]" fortran-end-of-block nil))
+
\f
(defvar fortran-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?/ "." table)
(modify-syntax-entry ?\' "\"" table)
(modify-syntax-entry ?\" "\"" table)
- ;; Consistent with GNU Fortran -- see the manual.
+ ;; Consistent with GNU Fortran's default -- see the manual.
+ ;; The F77 standard imposes no rule on this issue.
(modify-syntax-entry ?\\ "\\" table)
;; This might be better as punctuation, as for C, but this way you
;; can treat floating-point numbers as symbols.
(define-key map "\C-c;" 'fortran-comment-region)
(define-key map "\M-;" 'fortran-indent-comment)
(define-key map "\M-\n" 'fortran-split-line)
+ (define-key map "\M-\C-n" 'fortran-end-of-block)
+ (define-key map "\M-\C-p" 'fortran-beginning-of-block)
(define-key map "\M-\C-q" 'fortran-indent-subprogram)
(define-key map "\C-c\C-w" 'fortran-window-create-momentarily)
(define-key map "\C-c\C-r" 'fortran-column-ruler)
Variables controlling indentation style and extra features:
-`comment-start'
+`fortran-comment-line-start'
To use comments starting with `!', set this to the string \"!\".
`fortran-do-indent'
Extra indentation within DO blocks (default 3).
(let (fortran-blink-matching-if ; avoid blinking delay
indent-region-function)
(indent-region start end nil))))
- (set (make-local-variable 'require-final-newline) t)
+ (set (make-local-variable 'require-final-newline) mode-require-final-newline)
;; The syntax tables don't understand the column-0 comment-markers.
(set (make-local-variable 'comment-use-syntax) nil)
(set (make-local-variable 'comment-padding) "$$$")
'((fortran-font-lock-keywords
fortran-font-lock-keywords-1
fortran-font-lock-keywords-2
- fortran-font-lock-keywords-3)
+ fortran-font-lock-keywords-3
+ fortran-font-lock-keywords-4)
nil t ((?/ . "$/") ("_$" . "w"))
fortran-beginning-of-subprogram))
(set (make-local-variable 'font-lock-syntactic-keywords)
(set (make-local-variable 'add-log-current-defun-function)
#'fortran-current-defun)
(set (make-local-variable 'dabbrev-case-fold-search) 'case-fold-search)
- (set (make-local-variable 'gud-find-expr) 'gud-find-fortran-expr)
- (run-hooks 'fortran-mode-hook))
+ (set (make-local-variable 'gud-find-expr-function) 'fortran-gud-find-expr)
+ (run-mode-hooks 'fortran-mode-hook))
\f
+(defun fortran-gud-find-expr ()
+ ;; Consider \n as punctuation (end of expression).
+ (with-syntax-table fortran-gud-syntax-table
+ (gud-find-c-expr)))
+
(defsubst fortran-comment-indent ()
"Return the indentation appropriate for the current comment line.
This is 0 for a line matching `fortran-comment-line-start-skip', else
fortran-minimum-statement-indent-tab
fortran-minimum-statement-indent-fixed) (current-column))
;; In col 8 with a single tab to the left.
- (eq ?\t (char-after (line-beginning-position)))
+ (eq ?\t (char-after (line-beginning-position)))
(not (or (eq last-command 'fortran-indent-line)
(eq last-command
'fortran-indent-new-line))))
(if (not not-last-statement)
'last-statement)))
+(defun fortran-looking-at-if-then ()
+ "Return non-nil if at the start of a line with an IF ... THEN statement."
+ ;; cf f90-looking-at-if-then.
+ (let ((p (point))
+ (i (fortran-beginning-if)))
+ (if i
+ (save-excursion
+ (goto-char i)
+ (beginning-of-line)
+ (= (point) p)))))
+
+;; Used in hs-special-modes-alist.
+(defun fortran-end-of-block (&optional num)
+ "Move point forward to the end of the current code block.
+With optional argument NUM, go forward that many balanced blocks.
+If NUM is negative, go backward to the start of a block. Does
+not check for consistency of block types. Interactively, pushes
+mark before moving point."
+ (interactive "p")
+ (if (interactive-p) (push-mark (point) t))
+ (and num (< num 0) (fortran-beginning-of-block (- num)))
+ (let ((case-fold-search t)
+ (count (or num 1)))
+ (end-of-line)
+ (while (and (> count 0)
+ (re-search-forward
+ (concat "\\(" fortran-blocks-re
+ (if fortran-check-all-num-for-matching-do
+ "\\|^[ \t]*[0-9]+" "")
+ "\\|continue\\|end\\)\\>")
+ nil 'move))
+ (beginning-of-line)
+ (if (if (looking-at (concat "^[0-9 \t]*" fortran-if-start-re))
+ (fortran-looking-at-if-then)
+ (looking-at fortran-start-block-re))
+ (setq count (1+ count))
+ (if (or (looking-at fortran-end-block-re)
+ (and (or (looking-at "^[0-9 \t]*continue")
+ (and fortran-check-all-num-for-matching-do
+ (looking-at "[ \t]*[0-9]+")))
+ (fortran-check-for-matching-do)))
+ (setq count (1- count))))
+ (end-of-line))
+ (if (> count 0) (error "Missing block end"))))
+
+(defun fortran-beginning-of-block (&optional num)
+ "Move point backwards to the start of the current code block.
+With optional argument NUM, go backward that many balanced
+blocks. If NUM is negative, go forward to the end of a block.
+Does not check for consistency of block types. Interactively,
+pushes mark before moving point."
+ (interactive "p")
+ (if (interactive-p) (push-mark (point) t))
+ (and num (< num 0) (fortran-end-of-block (- num)))
+ (let ((case-fold-search t)
+ (count (or num 1)))
+ (beginning-of-line)
+ (while (and (> count 0)
+ (re-search-backward
+ (concat "\\(" fortran-blocks-re
+ (if fortran-check-all-num-for-matching-do
+ "\\|^[ \t]*[0-9]+" "")
+ "\\|continue\\|end\\)\\>")
+ nil 'move))
+ (beginning-of-line)
+ (if (if (looking-at (concat "^[0-9 \t]*" fortran-if-start-re))
+ (fortran-looking-at-if-then)
+ (looking-at fortran-start-block-re))
+ (setq count (1- count))
+ (if (or (looking-at fortran-end-block-re)
+ (and (or (looking-at "^[0-9 \t]*continue")
+ (and fortran-check-all-num-for-matching-do
+ (looking-at "[ \t]*[0-9]+")))
+ (fortran-check-for-matching-do)))
+ (setq count (1+ count)))))
+ ;; Includes an un-named main program block.
+ (if (> count 0) (error "Missing block start"))))
+
\f
(defun fortran-blink-match (regex keyword find-begin)
"From a line matching REGEX, blink matching KEYWORD statement line.
(let* ((char (if (stringp fortran-comment-indent-char)
(aref fortran-comment-indent-char 0)
fortran-comment-indent-char))
- (chars (string ? ?\t char)))
+ (chars (string ?\s ?\t char)))
(goto-char (match-end 0))
(skip-chars-backward chars)
(delete-region (point) (progn (skip-chars-forward chars)
(if indent-tabs-mode
(goto-char (match-end 0))
(delete-char 2)
- (insert-char ? 5)
+ (insert-char ?\s 5)
(insert fortran-continuation-string))
(if (looking-at " \\{5\\}[^ 0\n]")
(if indent-tabs-mode
(bol (line-beginning-position))
(eol (line-end-position))
(bos (min eol (+ bol (fortran-current-line-indentation))))
+ ;; If in a string at fill-column, break it either before the
+ ;; initial quote, or at fill-col (if string is too long).
(quote
(save-excursion
(goto-char bol)
;; OK to break quotes on comment lines.
(unless (looking-at fortran-comment-line-start-skip)
(let (fcpoint start)
- (move-to-column fill-column)
- (when (fortran-is-in-string-p (setq fcpoint (point)))
- (save-excursion
- (re-search-backward "\\S\"\\s\"\\S\"" bol t)
- (setq start
- (if fortran-break-before-delimiters
- (point)
- (1+ (point)))))
- (if (re-search-forward "\\S\"\\s\"\\S\"" eol t)
- (backward-char 2))
- ;; If the current string is longer than 72 - 6 chars,
- ;; break it at the fill column (else infinite loop).
- (if (> (- (point) start)
- (- fill-column 6 fortran-continuation-indent))
- fcpoint
- start))))))
+ (move-to-column fill-column)
+ (when (fortran-is-in-string-p (setq fcpoint (point)))
+ (save-excursion
+ (re-search-backward "\\S\"\\s\"\\S\"?" bol t)
+ (setq start
+ (if fortran-break-before-delimiters
+ (point)
+ (1+ (point)))))
+ (if (re-search-forward "\\S\"\\s\"\\S\"" eol t)
+ (backward-char 2))
+ ;; If the current string is longer than (fill-column
+ ;; - 6) chars, break it at the fill column (else
+ ;; infinite loop).
+ (if (> (- (point) start)
+ (- fill-column 6 fortran-continuation-indent))
+ fcpoint
+ start))))))
;; Decide where to split the line. If a position for a quoted
;; string was found above then use that, else break the line
- ;; before the last delimiter.
- ;; Delimiters are whitespace, commas, and operators.
- ;; Will break before a pair of *'s.
+ ;; before/after the last delimiter.
(fill-point
(or quote
(save-excursion
- (move-to-column (1+ fill-column))
- ;; GM Make this a defcustom as in f90-mode? Add ", (?
- (skip-chars-backward "^ \t\n,'+-/*=)"
-;;; (if fortran-break-before-delimiters
-;;; "^ \t\n,'+-/*=" "^ \t\n,'+-/*=)")
- )
- (when (<= (point) (1+ bos))
+ ;; If f-b-b-d is t, have an extra column to play with,
+ ;; since delimiter gets shifted to new line.
+ (move-to-column (if fortran-break-before-delimiters
+ (1+ fill-column)
+ fill-column))
+ (let ((repeat t))
+ (while repeat
+ (setq repeat nil)
+ ;; Adapted from f90-find-breakpoint.
+ (re-search-backward fortran-break-delimiters-re bol)
+ (if (not fortran-break-before-delimiters)
+ (if (looking-at fortran-no-break-re)
+ ;; Deal with cases such as "**" split over
+ ;; fill-col. Simpler alternative would be
+ ;; to start from (1- fill-column) above.
+ (if (> (+ 2 (current-column)) fill-column)
+ (setq repeat t)
+ (forward-char 2))
+ (forward-char 1))
+ (backward-char)
+ (or (looking-at fortran-no-break-re)
+ (forward-char)))))
+ ;; Line indented beyond fill-column?
+ (when (<= (point) bos)
(move-to-column (1+ fill-column))
;; What is this doing???
(or (re-search-forward "[\t\n,'+-/*)=]" eol t)
(goto-char bol)))
(if (bolp)
- (re-search-forward "[ \t]" opoint t)
- (backward-char)
- (if (looking-at "\\s\"")
- (forward-char)
- (skip-chars-backward " \t\*")))
- (if fortran-break-before-delimiters
- (point)
- (1+ (point)))))))
+ (re-search-forward "[ \t]" opoint t))
+ (point)))))
;; If we are in an in-line comment, don't break unless the
;; line of code is longer than it should be. Otherwise
;; break the line at the column computed above.
(provide 'fortran)
+;;; arch-tag: 74935096-21c4-4cab-8ee5-6ef16090dc04
;;; fortran.el ends here