1 ;;; fortran.el --- Fortran mode for GNU Emacs
3 ;; Copyright (C) 1986, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
4 ;; 2002, 2003, 2004, 2005, 2006, 2007, 2008
5 ;; Free Software Foundation, Inc.
7 ;; Author: Michael D. Prange <prange@erl.mit.edu>
8 ;; Maintainer: Glenn Morris <rgm@gnu.org>
9 ;; Keywords: fortran, languages
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 3, or (at your option)
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 ;; Boston, MA 02110-1301, USA.
30 ;; This mode is documented in the Emacs manual.
32 ;; Note that it is for editing Fortran77 or Fortran90 fixed source
33 ;; form. For editing Fortran 90 free format source, use `f90-mode'
34 ;; (f90.el). It is meant to support the GNU Fortran language
35 ;; implemented by g77 (its extensions to Fortran77 and
36 ;; interpretations, e.g. of blackslash in strings).
40 ;; Fortran mode was upgraded by Stephen A. Wood (saw@cebaf.gov).
42 ;; We acknowledge many contributions and valuable suggestions by
43 ;; Lawrence R. Dodd, Ralf Fassel, Ralph Finch, Stephen Gildea,
44 ;; Dr. Anil Gokhale, Ulrich Mueller, Mark Neale, Eric Prestemon,
45 ;; Gary Sabot and Richard Stallman.
51 ;; * Tidy it all up (more)!
52 ;; * Implement insertion and removal of statement continuations in
53 ;; mixed f77/f90 style, with the first `&' past column 72 and the
54 ;; second in column 6.
55 ;; * Support any other extensions to f77 grokked by GNU Fortran I've missed.
58 (defvar dabbrev-case-fold-search)
59 (defvar gud-find-expr-function)
60 (defvar imenu-case-fold-search)
61 (defvar imenu-syntax-alist)
62 (defvar comment-region-function)
63 (defvar uncomment-region-function)
66 "Major mode for editing fixed format Fortran code."
67 :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
68 :link '(custom-manual "(emacs)Fortran")
71 (defgroup fortran-indent nil
72 "Indentation variables in Fortran mode."
76 (defgroup fortran-comment nil
77 "Comment-handling variables in Fortran mode."
82 (defcustom fortran-tab-mode-default nil
83 "Default tabbing/carriage control style for empty files in Fortran mode.
84 A non-nil value specifies tab-digit style of continuation control.
85 A value of nil specifies that continuation lines are marked
86 with a character in column 6."
88 :group 'fortran-indent)
89 (put 'fortran-tab-mode-default 'safe-local-variable 'booleanp)
91 ;; TODO add more detail of what tab mode is to doc string.
92 (defcustom fortran-tab-mode-string
93 (propertize "/t" 'help-echo "This buffer is in Fortran TAB mode"
94 'mouse-face 'mode-line-highlight
96 (make-mode-line-mouse-map 'mouse-1
100 'fortran-tab-mode-string))))
101 "String to appear in mode line in TAB format buffers."
103 :group 'fortran-indent)
104 (put 'fortran-tab-mode-string 'risky-local-variable t)
106 (defcustom fortran-do-indent 3
107 "Extra indentation applied to DO blocks."
109 :group 'fortran-indent)
110 (put 'fortran-do-indent 'safe-local-variable 'integerp)
112 (defcustom fortran-if-indent 3
113 "Extra indentation applied to IF, SELECT CASE and WHERE blocks."
115 :group 'fortran-indent)
116 (put 'fortran-if-indent 'safe-local-variable 'integerp)
118 (defcustom fortran-structure-indent 3
119 "Extra indentation applied to STRUCTURE, UNION, MAP and INTERFACE blocks."
121 :group 'fortran-indent)
122 (put 'fortran-structure-indent 'safe-local-variable 'integerp)
124 (defcustom fortran-continuation-indent 5
125 "Extra indentation applied to continuation lines."
127 :group 'fortran-indent)
128 (put 'fortran-continuation-indent 'safe-local-variable 'integerp)
130 (defcustom fortran-comment-indent-style 'fixed
131 "How to indent comments.
132 nil forces comment lines not to be touched;
133 `fixed' indents to `fortran-comment-line-extra-indent' columns beyond
134 `fortran-minimum-statement-indent-fixed' (if `indent-tabs-mode' nil), or
135 `fortran-minimum-statement-indent-tab' (if `indent-tabs-mode' non-nil);
136 `relative' indents to current Fortran indentation plus
137 `fortran-comment-line-extra-indent'."
138 :type '(radio (const :tag "Untouched" nil) (const fixed) (const relative))
139 :group 'fortran-indent)
140 (put 'fortran-comment-indent 'safe-local-variable
141 (lambda (value) (memq value '(nil fixed relative))))
143 (defcustom fortran-comment-line-extra-indent 0
144 "Amount of extra indentation for text within full-line comments."
146 :group 'fortran-indent
147 :group 'fortran-comment)
148 (put 'fortran-comment-line-extra-indent 'safe-local-variable 'integerp)
150 (defcustom fortran-comment-line-start "C"
151 "Delimiter inserted to start new full-line comment.
152 You might want to change this to \"*\", for instance."
155 :group 'fortran-comment)
156 (put 'fortran-comment-line-start 'safe-local-variable 'stringp)
158 ;; This used to match preprocessor lines too, but that messes up
159 ;; filling and doesn't seem to be necessary.
160 (defcustom fortran-comment-line-start-skip
161 "^[CcDd*!]\\(\\([^ \t\n]\\)\\2+\\)?[ \t]*"
162 "Regexp to match the start of a full-line comment."
165 :group 'fortran-comment)
166 (put 'fortran-comment-line-start-skip 'safe-local-variable 'stringp)
168 (defcustom fortran-directive-re
170 "Regexp to match a directive line.
171 The matching text will be fontified with `font-lock-keyword-face'.
172 The matching line will be given zero indentation."
175 :group 'fortran-indent)
176 (put 'fortran-directive-re 'safe-local-variable 'stringp)
178 (defcustom fortran-minimum-statement-indent-fixed 6
179 "Minimum statement indentation for fixed format continuation style."
181 :group 'fortran-indent)
182 (put 'fortran-minimum-statement-indent-fixed 'safe-local-variable 'integerp)
184 (defcustom fortran-minimum-statement-indent-tab (max tab-width 6)
185 "Minimum statement indentation for TAB format continuation style."
187 :group 'fortran-indent)
188 (put 'fortran-minimum-statement-indent-tab 'safe-local-variable 'integerp)
190 ;; Note that this is documented in the v18 manuals as being a string
191 ;; of length one rather than a single character.
192 ;; The code in this file accepts either format for compatibility.
193 (defcustom fortran-comment-indent-char " "
194 "Single-character string inserted for Fortran comment indentation.
197 :group 'fortran-comment)
198 (put 'fortran-comment-indent-char 'safe-local-variable
199 (lambda (value) (or (characterp value)
201 (= (length value) 1)))))
203 (defcustom fortran-line-number-indent 1
204 "Maximum indentation for Fortran line numbers.
205 5 means right-justify them within their five-column field."
207 :group 'fortran-indent)
208 (put 'fortran-line-number-indent 'safe-local-variable 'integerp)
210 (defcustom fortran-check-all-num-for-matching-do nil
211 "Non-nil causes all numbered lines to be treated as possible DO loop ends."
214 (put 'fortran-check-all-num-for-matching-do 'safe-local-variable 'booleanp)
216 (defcustom fortran-blink-matching-if nil
217 "Non-nil causes \\[fortran-indent-line] on ENDIF to blink on matching IF.
218 Also, from an ENDDO statement blink on matching DO [WHILE] statement."
221 (put 'fortran-blink-matching-if 'safe-local-variable 'booleanp)
223 (defcustom fortran-continuation-string "$"
224 "Single-character string used for Fortran continuation lines.
225 In fixed format continuation style, this character is inserted in
226 column 6 by \\[fortran-split-line] to begin a continuation line.
227 Also, if \\[fortran-indent-line] finds this at the beginning of a
228 line, it will convert the line into a continuation line of the
229 appropriate style. Normally $."
232 (put 'fortran-continuation-string 'safe-local-variable
233 (lambda (value) (and (stringp value)
234 (= (length value) 1))))
236 (defcustom fortran-comment-region "c$$$"
237 "String inserted by \\[fortran-comment-region] at start of each \
240 :group 'fortran-comment)
241 (put 'fortran-comment-region 'safe-local-variable 'stringp)
243 (defcustom fortran-electric-line-number t
244 "Non-nil causes line numbers to be moved to the correct column as typed."
247 (put 'fortran-electric-line-number 'safe-local-variable 'booleanp)
249 ;; TODO use fortran-line-length, somehow.
250 (defcustom fortran-column-ruler-fixed
251 "0 4 6 10 20 30 40 5\
253 \[ ]|{ | | | | | | | | \
255 "String displayed above current line by \\[fortran-column-ruler].
256 This variable is used in fixed format mode.
257 See the variable `fortran-column-ruler-tab' for TAB format mode."
260 (put 'fortran-column-ruler-fixed 'safe-local-variable 'stringp)
262 ;; TODO use fortran-line-length, somehow.
263 (defcustom fortran-column-ruler-tab
266 \[ ]| { | | | | | | | | \
268 "String displayed above current line by \\[fortran-column-ruler].
269 This variable is used in TAB format mode.
270 See the variable `fortran-column-ruler-fixed' for fixed format mode."
273 (put 'fortran-column-ruler-tab 'safe-local-variable 'stringp)
275 (defcustom fortran-analyze-depth 100
276 "Number of lines to scan to identify fixed or TAB format style."
279 (put 'fortran-analyze-depth 'safe-local-variable 'integerp)
281 (defcustom fortran-break-before-delimiters t
282 "Non-nil causes filling to break lines before delimiters.
283 Delimiters are characters matching the regexp `fortran-break-delimiters-re'."
286 (put 'fortran-break-before-delimiters 'safe-local-variable 'booleanp)
288 ;; TODO 0 as no-limit, as per g77.
289 (defcustom fortran-line-length 72
290 "Maximum number of characters in a line of fixed-form Fortran code.
291 Characters beyond this point are treated as comments. Setting
292 this variable directly (after fortran mode is loaded) does not
293 take effect. Use either \\[customize] (which affects all Fortran
294 buffers and the default) or the function
295 `fortran-line-length' (which can also operate on just the current
296 buffer). This corresponds to the g77 compiler option
297 `-ffixed-line-length-N'."
299 :initialize 'custom-initialize-default
300 :set (lambda (symbol value)
301 ;; Do all fortran buffers, and the default.
302 (fortran-line-length value t))
306 (put 'fortran-line-length 'safe-local-variable 'integerp)
307 (make-variable-buffer-local 'fortran-line-length)
309 (defcustom fortran-mode-hook nil
310 "Hook run when entering Fortran mode."
315 (defconst fortran-break-delimiters-re "[-+*/><=, \t]"
316 "Regexp matching delimiter characters at which lines may be broken.
317 There are certain tokens comprised entirely of characters
318 matching this regexp that should not be split, and these are
319 specified by the constant `fortran-no-break-re'.")
321 ;; The ">=", etc F77 extensions are supported by g77.
322 (defconst fortran-no-break-re
323 (regexp-opt '("**" "//" "=>" ">=" "<=" "==" "/=") 'paren)
324 "Regexp specifying where not to break lines when filling.
325 This regexp matches certain tokens comprised entirely of
326 characters matching the regexp `fortran-break-delimiters-re' that should
327 not be split by filling. Each element is assumed to be two
330 (defconst fortran-if-start-re "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?if[ \t]*("
331 "Regexp matching the start of an IF statement.")
333 (defconst fortran-end-prog-re1
335 \\([ \t]*\\(program\\|subroutine\\|function\\|block[ \t]*data\\)\\>\
336 \\([ \t]*\\(\\sw\\|\\s_\\)+\\)?\\)?"
337 "Regexp possibly matching the end of a subprogram.")
339 (defconst fortran-end-prog-re
340 (concat "^[ \t0-9]*" fortran-end-prog-re1)
341 "Regexp possibly matching the end of a subprogram, from the line start.
342 See also `fortran-end-prog-re1'.")
344 (defconst fortran-type-types
346 (mapconcat 'identity ; " " -> "[ \t]*"
350 '("character" "byte" "integer" "logical"
351 "none" "real" "complex"
352 "double precision" "double complex"))
353 (structured-types '("structure" "union" "map"))
354 (other-types '("record" "dimension"
355 "parameter" "common" "save"
356 "external" "intrinsic" "data"
359 (mapcar (lambda (x) (concat "implicit " x))
362 (mapcar (lambda (x) (concat "end " x))
365 other-types)) 'paren))
367 "Regexp matching Fortran types.")
369 (defvar fortran-font-lock-keywords-1
370 ;; Program, subroutine and function declarations, plus calls.
371 '(("\\<\\(block[ \t]*data\\|call\\|entry\\|function\\|\
372 program\\|subroutine\\)\\>[ \t]*\\(\\sw+\\)?"
373 (1 font-lock-keyword-face)
374 (2 font-lock-function-name-face nil t)))
375 "Subdued level highlighting for Fortran mode.")
377 (defvar fortran-font-lock-keywords-2
378 (append fortran-font-lock-keywords-1
380 ;; Fontify all type specifiers (must be first - see below).
381 (cons fortran-type-types 'font-lock-type-face)
382 ;; Builtin keywords (except logical, do and goto - see below).
383 (concat "\\<" (regexp-opt
384 '("continue" "format" "end" "enddo"
385 "if" "then" "else" "endif" "elseif"
386 "while" "inquire" "stop" "return"
387 "include" "open" "close" "read"
388 "write" "format" "print" "select" "case"
389 "cycle" "exit" "rewind" "backspace"
392 ;; Builtin operators.
393 (concat "\\." (regexp-opt
394 '("and" "or" "not" "lt" "le" "eq" "ge"
395 "gt" "ne" "true" "false")
397 ;; do/goto keywords and targets, and goto tags.
398 '("\\<\\(do\\|go *to\\)\\>[ \t]*\\([0-9]+\\)?"
399 (1 font-lock-keyword-face)
400 (2 font-lock-constant-face nil t))
401 '("^ *\\([0-9]+\\)" . font-lock-constant-face)))
402 "Medium level highlighting for Fortran mode.")
404 (defvar fortran-font-lock-keywords-3
406 fortran-font-lock-keywords-1
407 ;; All type specifiers plus their declared items.
409 (list (concat fortran-type-types "[ \t(/]*\\(*\\)?")
411 '(1 font-lock-type-face)
412 ;; Declaration item (or just /.../ block name).
413 `(font-lock-match-c-style-declaration-item-and-skip-to-next
414 ;; Start after any *(...) expression.
416 (and (match-beginning ,(1+ (regexp-opt-depth
417 fortran-type-types)))
421 ;; No need to clean up.
423 ;; Fontify as a variable name, functions fontified elsewhere.
424 (1 font-lock-variable-name-face nil t))))
425 ;; Things extra to `fortran-font-lock-keywords-3' (must be done first).
427 ;; Goto-like `err=label'/`end=label' in read/write statements.
428 '(", *\\(e\\(nd\\|rr\\)\\)\\> *\\(= *\\([0-9]+\\)\\)?"
429 (1 font-lock-keyword-face) (4 font-lock-constant-face nil t))
430 ;; Standard continuation character and in a TAB-formatted line.
431 '("^ \\{5\\}\\([^ 0\n]\\)" 1 font-lock-string-face)
432 '("^\t\\([1-9]\\)" 1 font-lock-string-face))
433 `((,fortran-directive-re (0 font-lock-keyword-face t)))
434 ;; `fortran-font-lock-keywords-2' without types (see above).
435 (cdr (nthcdr (length fortran-font-lock-keywords-1)
436 fortran-font-lock-keywords-2)))
437 "Gaudy level highlighting for Fortran mode.")
439 (defvar fortran-font-lock-keywords-4
440 (append fortran-font-lock-keywords-3
444 '("int" "ifix" "idint" "real" "float" "sngl"
445 "dble" "cmplx" "ichar" "char" "aint" "dint"
446 "anint" "dnint" "nint" "idnint" "iabs" "abs"
447 "dabs" "cabs" "mod" "amod" "dmod" "isign"
448 "sign" "dsign" "idim" "dim" "ddim" "dprod"
449 "max" "max0" "amax1" "dmax1" "amax0" "max1"
450 "min" "min0" "amin1" "dmin1" "amin0" "min1"
451 "len" "index" "lge" "lgt" "lle" "llt" "aimag"
452 "conjg" "sqrt" "dsqrt" "csqrt" "exp" "dexp"
453 "cexp" "log" "alog" "dlog" "clog" "log10"
454 "alog10" "dlog10" "sin" "dsin" "csin" "cos"
455 "dcos" "ccos" "tan" "dtan" "asin" "dasin"
456 "acos" "dacos" "atan" "datan" "atan2" "datan2"
457 "sinh" "dsinh" "cosh" "dcosh" "tanh" "dtanh")
458 'paren) "[ \t]*(") '(1 font-lock-builtin-face))))
459 "Maximum highlighting for Fortran mode.
460 Consists of level 3 plus all other intrinsics not already highlighted.")
462 ;; Comments are real pain in Fortran because there is no way to
463 ;; represent the standard comment syntax in an Emacs syntax table.
464 ;; (We can do so for F90-style). Therefore an unmatched quote in a
465 ;; standard comment will throw fontification off on the wrong track.
466 ;; So we do syntactic fontification with regexps.
467 (defun fortran-font-lock-syntactic-keywords ()
468 "Return a value for `font-lock-syntactic-keywords' in Fortran mode.
469 This varies according to the value of `fortran-line-length'.
470 This is used to fontify fixed-format Fortran comments."
471 `(("^[cd\\*]" 0 (11))
472 (,(format "^[^cd\\*\t\n].\\{%d\\}\\([^\n]+\\)" (1- fortran-line-length))
475 (defvar fortran-font-lock-keywords fortran-font-lock-keywords-1
476 "Default expressions to highlight in Fortran mode.")
478 (defvar fortran-imenu-generic-expression
479 ;; These patterns could be confused by sequence nos. in cols 72+ and
480 ;; don't allow continuations everywhere.
484 ;; [This will be fooled by `end function' allowed by G77. Also,
485 ;; it assumes sensible whitespace is employed.]
487 ;; leading whitespace:
489 ;; function declaration with optional type, e.g. `real',
490 ;; `real*4', character(*), `double precision':
491 "\\(\\sw\\|\\s-\\|[*()+]\\)*"
492 "\\<function\\|subroutine\\|entry\\|block\\s-*data\\|program\\)"
493 ;; Possible statement continuation:
494 "[ \t" fortran-continuation-string "]+"
495 ;; Variable to index:
498 ;; Un-named block data.
499 '(nil "^\\s-+\\(block\\s-*data\\)\\s-*$" 1))
500 "Value for `imenu-generic-expression' in Fortran mode.")
504 (defconst fortran-blocks-re
505 (concat "block[ \t]*data\\|select[ \t]*case\\|"
506 (regexp-opt '("do" "if" "interface" "function" "map" "program"
507 "structure" "subroutine" "union" "where")))
508 "Regexp potentially indicating the start or end of a Fortran \"block\".
509 Omits naked END statements, and DO-loops closed by anything other
512 (defconst fortran-end-block-re
513 ;; Do-loops terminated by things other than ENDDO cannot be handled
514 ;; with a regexp. This omission does not seem to matter to hideshow...
515 (concat "^[ \t0-9]*\\<end[ \t]*\\("
517 ;; Naked END statement.
519 "Regexp matching the end of a Fortran \"block\", from the line start.
520 Note that only ENDDO is handled for the end of a DO-loop. Used
521 in the Fortran entry in `hs-special-modes-alist'.")
523 (defconst fortran-start-block-re
525 "^[ \t0-9]*\\(" ; statement number
526 ;; Structure label for DO, IF, SELECT, WHERE.
527 "\\(\\(\\sw+[ \t]*:[ \t]*\\)?"
528 ;; IF blocks are a nuisance:
529 ;; IF ( ... ) foo is not a block, but a single statement.
530 ;; IF ( ... ) THEN can be split over multiple lines.
531 ;; [So can, eg, a DO WHILE (... ), but that is less common, I hope.]
532 ;; The regexp below allows for it to be split over at most 2 lines.
533 ;; That leads to the problem of not matching two consecutive IF
534 ;; statements as one, eg:
537 ;; It simply is not possible to do this in a 100% correct fashion
538 ;; using a regexp - see the functions fortran-end-if,
539 ;; fortran-beginning-if for the hoops we have to go through.
540 ;; An alternative is to match on THEN at a line end, eg:
541 ;; ".*)[ \t]*then[ \t]*\\($\\|!\\)"
542 ;; This would also match ELSE branches, though. This does not seem
543 ;; right to me, because then one has neighbouring blocks that are
544 ;; not nested in each other.
545 "\\(if[ \t]*(\\(.*\\|"
546 ".*\n\\([^if]*\\([^i].\\|.[^f]\\|.\\>\\)\\)\\)\\<then\\|"
547 "do\\|select[ \t]*case\\|where\\)\\)\\|"
548 (regexp-opt '("interface" "function" "map" "program"
549 "structure" "subroutine" "union"))
550 "\\|block[ \t]*data\\)[ \t]*")
551 "Regexp matching the start of a Fortran \"block\", from the line start.
552 A simple regexp cannot do this in fully correct fashion, so this
553 tries to strike a compromise between complexity and flexibility.
554 Used in the Fortran entry in `hs-special-modes-alist'.")
556 (add-to-list 'hs-special-modes-alist
557 `(fortran-mode ,fortran-start-block-re ,fortran-end-block-re
558 "^[cC*!]" fortran-end-of-block nil))
561 (defvar fortran-mode-syntax-table
562 (let ((table (make-syntax-table)))
563 ;; We might like `;' to be punctuation (g77 multi-statement
564 ;; lines), but that screws abbrevs.
565 (modify-syntax-entry ?\; "w" table)
566 (modify-syntax-entry ?\r " " table)
567 (modify-syntax-entry ?+ "." table)
568 (modify-syntax-entry ?- "." table)
569 (modify-syntax-entry ?= "." table)
570 (modify-syntax-entry ?* "." table)
571 (modify-syntax-entry ?/ "." table)
572 (modify-syntax-entry ?\' "\"" table)
573 (modify-syntax-entry ?\" "\"" table)
574 ;; Consistent with GNU Fortran's default -- see the manual.
575 ;; The F77 standard imposes no rule on this issue.
576 (modify-syntax-entry ?\\ "\\" table)
577 ;; This might be better as punctuation, as for C, but this way you
578 ;; can treat floating-point numbers as symbols.
579 (modify-syntax-entry ?. "_" table) ; e.g. `a.ne.b'
580 (modify-syntax-entry ?_ "_" table)
581 (modify-syntax-entry ?$ "_" table) ; esp. VMSisms
582 (modify-syntax-entry ?\! "<" table)
583 (modify-syntax-entry ?\n ">" table)
585 "Syntax table used in Fortran mode.")
587 (defvar fortran-gud-syntax-table
588 (let ((st (make-syntax-table fortran-mode-syntax-table)))
589 (modify-syntax-entry ?\n "." st)
591 "Syntax table used to parse Fortran expressions for printing in GUD.")
593 (defvar fortran-mode-map
594 (let ((map (make-sparse-keymap)))
595 (define-key map ";" 'fortran-abbrev-start)
596 (define-key map "\C-c;" 'fortran-comment-region)
597 ;; The default comment-dwim does at least as much as this.
598 ;;; (define-key map "\M-;" 'fortran-indent-comment)
599 (define-key map "\M-\n" 'fortran-split-line)
600 (define-key map "\M-\C-n" 'fortran-end-of-block)
601 (define-key map "\M-\C-p" 'fortran-beginning-of-block)
602 (define-key map "\M-\C-q" 'fortran-indent-subprogram)
603 (define-key map "\C-c\C-w" 'fortran-window-create-momentarily)
604 (define-key map "\C-c\C-r" 'fortran-column-ruler)
605 (define-key map "\C-c\C-p" 'fortran-previous-statement)
606 (define-key map "\C-c\C-n" 'fortran-next-statement)
607 (define-key map "\C-c\C-d" 'fortran-join-line) ; like f90
608 (define-key map "\M-^" 'fortran-join-line) ; subvert delete-indentation
609 (define-key map "0" 'fortran-electric-line-number)
610 (define-key map "1" 'fortran-electric-line-number)
611 (define-key map "2" 'fortran-electric-line-number)
612 (define-key map "3" 'fortran-electric-line-number)
613 (define-key map "4" 'fortran-electric-line-number)
614 (define-key map "5" 'fortran-electric-line-number)
615 (define-key map "6" 'fortran-electric-line-number)
616 (define-key map "7" 'fortran-electric-line-number)
617 (define-key map "8" 'fortran-electric-line-number)
618 (define-key map "9" 'fortran-electric-line-number)
620 (easy-menu-define fortran-menu map "Menu for Fortran mode."
622 ["Manual" (info "(emacs)Fortran")]
624 ,(custom-menu-create 'fortran)
626 ["Save" Custom-save t]
627 ["Reset to Current" Custom-reset-current t]
628 ["Reset to Saved" Custom-reset-saved t]
629 ["Reset to Standard Settings" Custom-reset-standard t]
632 ["Comment Region" fortran-comment-region mark-active]
634 (fortran-comment-region (region-beginning) (region-end) 1)
636 ["Indent Region" indent-region mark-active]
637 ["Indent Subprogram" fortran-indent-subprogram t]
639 ["Beginning of Subprogram" fortran-beginning-of-subprogram t]
640 ["End of Subprogram" fortran-end-of-subprogram t]
642 ["Subprogram" mark-defun t]
643 ["IF Block" fortran-mark-if t]
644 ["DO Block" fortran-mark-do t]
646 ["Narrow to Subprogram" narrow-to-defun t]
649 ["Temporary column ruler" fortran-column-ruler t]
650 ;; May not be '72', depending on fortran-line-length, but this
651 ;; seems ok for a menu item.
652 ["72-column window" fortran-window-create t]
654 (enlarge-window-horizontally (- (frame-width) (window-width)))
655 (not (window-full-width-p))]
656 ["Momentary 72-column window" fortran-window-create-momentarily t]
658 ["Break Line at Point" fortran-split-line t]
659 ["Join Line" fortran-join-line t]
660 ["Fill Statement/Comment" fill-paragraph t]
662 ["Toggle auto-fill" auto-fill-mode :selected auto-fill-function
664 ["Toggle abbrev-mode" abbrev-mode :selected abbrev-mode
666 ["Add imenu Menu" imenu-add-menubar-index
667 :active (not (lookup-key (current-local-map) [menu-bar index]))
668 :included (fboundp 'imenu-add-to-menubar)]))
670 "Keymap used in Fortran mode.")
673 (defvar fortran-mode-abbrev-table
675 (define-abbrev-table 'fortran-mode-abbrev-table nil)
676 fortran-mode-abbrev-table)
677 "Abbrev table for Fortran mode.")
679 (let (abbrevs-changed)
680 ;; Use the 6th arg (SYSTEM-FLAG) of define-abbrev if possible.
681 ;; Only use `apply' to quieten the byte-compiler.
683 (function (lambda (element)
685 (apply 'define-abbrev fortran-mode-abbrev-table
686 (append element '(nil 0 t)))
687 (wrong-number-of-arguments
688 (apply 'define-abbrev fortran-mode-abbrev-table
689 (append element '(nil 0)))))))
690 '((";au" "automatic" )
692 (";bd" "block data" )
701 (";dc" "double complex" )
702 (";dp" "double precision" )
708 (";eq" "equivalence" )
717 (";ib" "implicit byte" )
718 (";ic" "implicit complex" )
719 (";ich" "implicit character")
720 (";ii" "implicit integer" )
721 (";il" "implicit logical" )
722 (";ir" "implicit real" )
725 (";intr" "intrinsic" )
728 (";o" "open" ) ; was ;op
742 (";su" "subroutine" )
751 (defun fortran-mode ()
752 "Major mode for editing Fortran code in fixed format.
753 For free format code, use `f90-mode'.
755 \\[fortran-indent-line] indents the current Fortran line correctly.
756 Note that DO statements must not share a common CONTINUE.
758 Type ;? or ;\\[help-command] to display a list of built-in abbrevs for\
764 Variables controlling indentation style and extra features:
766 `fortran-comment-line-start'
767 To use comments starting with `!', set this to the string \"!\".
769 Extra indentation within DO blocks (default 3).
771 Extra indentation within IF blocks (default 3).
772 `fortran-structure-indent'
773 Extra indentation within STRUCTURE, UNION, MAP and INTERFACE blocks.
775 `fortran-continuation-indent'
776 Extra indentation applied to continuation statements (default 5).
777 `fortran-comment-line-extra-indent'
778 Amount of extra indentation for text in full-line comments (default 0).
779 `fortran-comment-indent-style'
780 How to indent the text in full-line comments. Allowed values are:
781 nil don't change the indentation
782 fixed indent to `fortran-comment-line-extra-indent' beyond the
784 `fortran-minimum-statement-indent-fixed' (fixed format) or
785 `fortran-minimum-statement-indent-tab' (TAB format),
786 depending on the continuation format in use.
787 relative indent to `fortran-comment-line-extra-indent' beyond the
788 indentation for a line of code.
790 `fortran-comment-indent-char'
791 Single-character string to be inserted instead of space for
792 full-line comment indentation (default \" \").
793 `fortran-minimum-statement-indent-fixed'
794 Minimum indentation for statements in fixed format mode (default 6).
795 `fortran-minimum-statement-indent-tab'
796 Minimum indentation for statements in TAB format mode (default 9).
797 `fortran-line-number-indent'
798 Maximum indentation for line numbers (default 1). A line number will
799 get less than this much indentation if necessary to avoid reaching
801 `fortran-check-all-num-for-matching-do'
802 Non-nil causes all numbered lines to be treated as possible \"continue\"
803 statements (default nil).
804 `fortran-blink-matching-if'
805 Non-nil causes \\[fortran-indent-line] on an ENDIF (or ENDDO) statement
806 to blink on the matching IF (or DO [WHILE]). (default nil)
807 `fortran-continuation-string'
808 Single-character string to be inserted in column 5 of a continuation
809 line (default \"$\").
810 `fortran-comment-region'
811 String inserted by \\[fortran-comment-region] at start of each line in
812 the region (default \"c$$$\").
813 `fortran-electric-line-number'
814 Non-nil causes line number digits to be moved to the correct column
815 as typed (default t).
816 `fortran-break-before-delimiters'
817 Non-nil causes lines to be broken before delimiters (default t).
819 Turning on Fortran mode calls the value of the variable `fortran-mode-hook'
820 with no args, if that value is non-nil."
822 (kill-all-local-variables)
823 (setq major-mode 'fortran-mode
825 local-abbrev-table fortran-mode-abbrev-table)
826 (set-syntax-table fortran-mode-syntax-table)
827 (use-local-map fortran-mode-map)
828 (set (make-local-variable 'indent-line-function) 'fortran-indent-line)
829 (set (make-local-variable 'indent-region-function)
831 (let (fortran-blink-matching-if ; avoid blinking delay
832 indent-region-function)
833 (indent-region start end nil))))
834 (set (make-local-variable 'require-final-newline) mode-require-final-newline)
835 ;; The syntax tables don't understand the column-0 comment-markers.
836 (set (make-local-variable 'comment-use-syntax) nil)
837 (set (make-local-variable 'comment-padding) "$$$")
838 (set (make-local-variable 'comment-start) fortran-comment-line-start)
839 (set (make-local-variable 'comment-start-skip)
840 ;; We can't reuse `fortran-comment-line-start-skip' directly because
841 ;; it contains backrefs whereas we need submatch-1 to end at the
842 ;; beginning of the comment delimiter.
843 ;; (concat "\\(\\)\\(![ \t]*\\|" fortran-comment-line-start-skip "\\)")
844 "\\(\\)\\(?:^[CcDd*]\\|!\\)\\(?:\\([^ \t\n]\\)\\2+\\)?[ \t]*")
845 (set (make-local-variable 'comment-indent-function) 'fortran-comment-indent)
846 (set (make-local-variable 'comment-region-function) 'fortran-comment-region)
847 (set (make-local-variable 'uncomment-region-function)
848 'fortran-uncomment-region)
849 (set (make-local-variable 'comment-insert-comment-function)
850 'fortran-indent-comment)
851 (set (make-local-variable 'abbrev-all-caps) t)
852 (set (make-local-variable 'normal-auto-fill-function) 'fortran-auto-fill)
853 (set (make-local-variable 'indent-tabs-mode) (fortran-analyze-file-format))
854 (setq mode-line-process '(indent-tabs-mode fortran-tab-mode-string))
855 (set (make-local-variable 'fill-column) fortran-line-length)
856 (set (make-local-variable 'fill-paragraph-function) 'fortran-fill-paragraph)
857 (set (make-local-variable 'font-lock-defaults)
858 '((fortran-font-lock-keywords
859 fortran-font-lock-keywords-1
860 fortran-font-lock-keywords-2
861 fortran-font-lock-keywords-3
862 fortran-font-lock-keywords-4)
863 nil t ((?/ . "$/") ("_$" . "w"))
864 fortran-beginning-of-subprogram
865 (font-lock-syntactic-keywords
866 . (fortran-font-lock-syntactic-keywords))))
867 (set (make-local-variable 'imenu-case-fold-search) t)
868 (set (make-local-variable 'imenu-generic-expression)
869 fortran-imenu-generic-expression)
870 (set (make-local-variable 'imenu-syntax-alist) '(("_$" . "w")))
871 (set (make-local-variable 'beginning-of-defun-function)
872 #'fortran-beginning-of-subprogram)
873 (set (make-local-variable 'end-of-defun-function)
874 #'fortran-end-of-subprogram)
875 (set (make-local-variable 'add-log-current-defun-function)
876 #'fortran-current-defun)
877 (set (make-local-variable 'dabbrev-case-fold-search) 'case-fold-search)
878 (set (make-local-variable 'gud-find-expr-function) 'fortran-gud-find-expr)
879 (add-hook 'hack-local-variables-hook 'fortran-hack-local-variables nil t)
880 (run-mode-hooks 'fortran-mode-hook))
883 (defun fortran-line-length (nchars &optional global)
884 "Set the length of fixed-form Fortran lines to NCHARS.
885 This normally only affects the current buffer, which must be in
886 Fortran mode. If the optional argument GLOBAL is non-nil, it
887 affects all Fortran buffers, and also the default."
891 (with-current-buffer buff
892 (when (eq major-mode 'fortran-mode)
893 (setq fortran-line-length nchars
894 fill-column fortran-line-length
895 new (fortran-font-lock-syntactic-keywords))
896 ;; Refontify only if necessary.
897 (unless (equal new font-lock-syntactic-keywords)
898 (setq font-lock-syntactic-keywords
899 (fortran-font-lock-syntactic-keywords))
900 (if font-lock-mode (font-lock-mode 1))))))
903 (list (current-buffer))))
905 (setq-default fortran-line-length nchars))))
907 (defun fortran-hack-local-variables ()
908 "Fortran mode adds this to `hack-local-variables-hook'."
909 (fortran-line-length fortran-line-length))
911 (declare-function gud-find-c-expr "gud.el" nil)
913 (defun fortran-gud-find-expr ()
914 ;; Consider \n as punctuation (end of expression).
915 (with-syntax-table fortran-gud-syntax-table
918 (defsubst fortran-comment-indent ()
919 "Return the indentation appropriate for the current comment line.
920 This is 0 for a line matching `fortran-comment-line-start-skip', else
921 the value of `comment-column' (leaving at least one space after code)."
922 (if (looking-at fortran-comment-line-start-skip) 0
924 (skip-chars-backward " \t")
925 (max (1+ (current-column)) comment-column))))
927 (defun fortran-indent-comment ()
928 "Align or create comment on current line.
929 Existing comments of all types are recognized and aligned.
930 If the line has no comment, a side-by-side comment is inserted and aligned,
931 if the value of `comment-start' is not nil and allows such comments.
932 Otherwise, a separate-line comment is inserted, on this line
933 or on a new line inserted before this line if this line is not blank."
936 ;; Recognize existing comments of either kind.
937 (cond ((fortran-find-comment-start-skip 'all)
938 (goto-char (match-beginning 0))
940 (fortran-indent-line)
941 (unless (= (current-column) (fortran-comment-indent))
942 (delete-horizontal-space)
943 (indent-to (fortran-comment-indent)))))
944 ;; No existing comment.
945 ;; If side-by-side comments are defined, insert one,
946 ;; unless line is now blank.
947 ((and comment-start (not (looking-at "[ \t]*$"))
948 (string-match comment-start-skip (concat " " comment-start)))
950 (delete-horizontal-space)
951 (indent-to (fortran-comment-indent))
952 (insert comment-start))
953 ;; Else insert separate-line comment, making a new line if nec.
955 (if (looking-at "^[ \t]*$")
956 (delete-horizontal-space)
960 (insert fortran-comment-line-start)
961 (insert-char (if (stringp fortran-comment-indent-char)
962 (aref fortran-comment-indent-char 0)
963 fortran-comment-indent-char)
964 (- (fortran-calculate-indent) (current-column))))))
966 (defun fortran-comment-region (beg-region end-region arg)
967 "Comment every line in the region.
968 Inserts the string variable `fortran-comment-region' at the beginning of
969 every line in the region.
970 BEG-REGION and END-REGION specify the region boundaries.
971 With non-nil ARG, uncomments the region."
972 (interactive "*r\nP")
973 (let ((end-region-mark (copy-marker end-region))
974 (save-point (point-marker)))
975 (goto-char beg-region)
978 (let ((com (regexp-quote fortran-comment-region))) ; uncomment
980 (delete-region (point) (match-end 0)))
981 (while (and (zerop (forward-line 1))
982 (< (point) end-region-mark))
984 (delete-region (point) (match-end 0)))))
985 (insert fortran-comment-region) ; comment
986 (while (and (zerop (forward-line 1))
987 (< (point) end-region-mark))
988 (insert fortran-comment-region)))
989 (goto-char save-point)
990 (set-marker end-region-mark nil)
991 (set-marker save-point nil)))
993 ;; uncomment-region calls this with 3 args.
994 (defun fortran-uncomment-region (start end &optional ignored)
995 "Uncomment every line in the region."
996 (fortran-comment-region start end t))
999 (defun fortran-abbrev-start ()
1000 "Typing ;\\[help-command] or ;? lists all the Fortran abbrevs.
1001 Any other key combination is executed normally."
1003 (insert last-command-char)
1004 (let* ((event (if (fboundp 'next-command-event) ; XEmacs
1005 (next-command-event)
1007 (char (if (fboundp 'event-to-character)
1008 (event-to-character event) event)))
1009 ;; Insert char if not equal to `?', or if abbrev-mode is off.
1010 (if (and abbrev-mode (or (eq char ??) (eq char help-char)
1011 (memq event help-event-list)))
1012 (fortran-abbrev-help)
1013 (push event unread-command-events))))
1015 (defun fortran-abbrev-help ()
1016 "List the currently defined abbrevs in Fortran mode."
1018 (message "Listing abbrev table...")
1019 (display-buffer (fortran-prepare-abbrev-list-buffer))
1020 (message "Listing abbrev table...done"))
1022 (defun fortran-prepare-abbrev-list-buffer ()
1023 "Create a buffer listing the Fortran mode abbreviations."
1024 (with-current-buffer (get-buffer-create "*Abbrevs*")
1026 (insert-abbrev-table-description 'fortran-mode-abbrev-table t)
1027 (goto-char (point-min))
1028 (set-buffer-modified-p nil)
1029 (edit-abbrevs-mode))
1030 (get-buffer-create "*Abbrevs*"))
1032 (defun fortran-column-ruler ()
1033 "Insert a column ruler momentarily above current line, till next keystroke.
1034 The ruler is defined by the value of `fortran-column-ruler-fixed' in fixed
1035 format mode, and `fortran-column-ruler-tab' in TAB format mode.
1036 The next key typed is executed unless it is SPC."
1038 (momentary-string-display
1039 (if indent-tabs-mode
1040 fortran-column-ruler-tab
1041 fortran-column-ruler-fixed)
1044 (if (eq (window-start (selected-window))
1045 (window-point (selected-window)))
1046 (line-beginning-position 2)
1048 nil "Type SPC or any command to erase ruler."))
1050 (defun fortran-window-create ()
1051 "Make the window `fortran-line-length' (default 72) columns wide.
1052 See also `fortran-window-create-momentarily'."
1054 (let ((window-min-width 2))
1055 (unless (window-full-width-p)
1056 (enlarge-window-horizontally (- (frame-width)
1058 (let* ((window-edges (window-edges))
1059 (scroll-bar-width (- (nth 2 window-edges)
1062 (split-window-horizontally (+ fortran-line-length scroll-bar-width)))
1064 (switch-to-buffer " fortran-window-extra" t)
1065 (select-window (previous-window))))
1067 (defun fortran-window-create-momentarily (&optional arg)
1068 "Momentarily make the window `fortran-line-length' (default 72) columns wide.
1069 Optional ARG non-nil and non-unity disables the momentary feature.
1070 See also `fortran-window-create'."
1074 (save-window-excursion
1077 (fortran-window-create)
1078 (error (error "No room for Fortran window")))
1079 (message "Type SPC to continue editing.")
1080 (let ((char (read-event)))
1081 (or (equal char ?\s)
1082 (setq unread-command-events (list char))))))
1083 (fortran-window-create)))
1085 (defun fortran-split-line ()
1086 "Break line at point and insert continuation marker and alignment."
1088 (delete-horizontal-space)
1090 (let ((pos (point)))
1092 (and (fortran-find-comment-start-skip 'all)
1093 (< (match-beginning 0) pos))))
1094 (insert ?\n (match-string 0))
1095 (if indent-tabs-mode
1096 (insert ?\n ?\t (fortran-numerical-continuation-char))
1097 (insert "\n " fortran-continuation-string))) ; space after \n important
1098 (fortran-indent-line)) ; when cont string is C, c or *
1100 (defun fortran-remove-continuation ()
1101 "Delete any Fortran continuation characters at point.
1102 Returns t if anything actually deleted."
1103 (when (looking-at "\\( \\{5\\}[^ 0\n]\\|\t[1-9]\\|&\\)")
1105 (delete-indentation)
1108 (defun fortran-join-line (arg)
1109 "Join current line to the previous one and re-indent.
1110 With a prefix argument, repeat this operation that many times.
1111 If the prefix argument ARG is negative, join the next -ARG lines.
1112 Continuation lines are correctly handled."
1118 (while (not (zerop arg))
1120 (or (fortran-remove-continuation)
1121 (delete-indentation))
1122 (setq arg (1- arg)))
1123 (fortran-indent-line)))
1125 (defun fortran-numerical-continuation-char ()
1126 "Return a digit for tab-digit style of continuation lines.
1127 If previous line is a tab-digit continuation line, return that digit
1128 plus one, otherwise return 1. Zero not allowed."
1131 (if (looking-at "\t[1-9]")
1132 (+ ?1 (% (- (char-after (1+ (point))) ?0) 9))
1135 (put 'fortran-electric-line-number 'delete-selection t)
1136 (defun fortran-electric-line-number (arg)
1137 "Self insert, but if part of a Fortran line number indent it automatically.
1138 Auto-indent does not happen if a numeric ARG is used."
1140 (if (or arg (not fortran-electric-line-number))
1142 (self-insert-command (prefix-numeric-value arg))
1143 (self-insert-command 1))
1144 (if (or (and (= 5 (current-column))
1147 ;; In col 5 with only spaces to the left.
1148 (looking-at " \\{5\\}")))
1149 (and (= (if indent-tabs-mode
1150 fortran-minimum-statement-indent-tab
1151 fortran-minimum-statement-indent-fixed) (current-column))
1152 ;; In col 8 with a single tab to the left.
1153 (eq ?\t (char-after (line-beginning-position)))
1154 (not (or (eq last-command 'fortran-indent-line)
1156 'fortran-indent-new-line))))
1158 (re-search-backward "[^ \t0-9]"
1159 (line-beginning-position)
1160 t)) ; not a line number
1161 (looking-at "[0-9]")) ; within a line number
1162 (self-insert-command (prefix-numeric-value arg))
1163 (skip-chars-backward " \t")
1164 (insert last-command-char)
1165 (fortran-indent-line))))
1168 (defun fortran-check-end-prog-re ()
1169 "Check a preliminary match against `fortran-end-prog-re'."
1170 ;; Having got a possible match for the subprogram end, we need a
1171 ;; match of whitespace, avoiding possible column 73+ stuff.
1173 (string-match "^\\s-*\\(\\'\\|\\s<\\)"
1174 (buffer-substring (match-end 0)
1175 (min (line-end-position)
1176 (+ fortran-line-length
1177 (line-beginning-position)))))))
1179 ;; Note that you can't just check backwards for `subroutine' &c in
1180 ;; case of un-marked main programs not at the start of the file.
1181 (defun fortran-beginning-of-subprogram ()
1182 "Move point to the beginning of the current Fortran subprogram."
1185 (let ((case-fold-search t))
1186 (beginning-of-line -1)
1188 (while (re-search-backward fortran-end-prog-re nil 'move)
1189 (if (fortran-check-end-prog-re)
1193 (defun fortran-end-of-subprogram ()
1194 "Move point to the end of the current Fortran subprogram."
1197 (let ((case-fold-search t))
1198 (if (save-excursion ; on END
1200 (and (looking-at fortran-end-prog-re)
1201 (fortran-check-end-prog-re)))
1203 (beginning-of-line 2)
1205 (while (re-search-forward fortran-end-prog-re nil 'move)
1206 (if (fortran-check-end-prog-re)
1208 (goto-char (match-beginning 0))
1211 (defun fortran-previous-statement ()
1212 "Move point to beginning of the previous Fortran statement.
1213 Returns 'first-statement if that statement is the first
1214 non-comment Fortran statement in the file, and nil otherwise.
1215 Directive lines are treated as comments."
1217 (let (not-first-statement continue-test)
1221 (not (looking-at fortran-comment-line-start-skip))
1222 (not (looking-at fortran-directive-re))
1225 (regexp-quote fortran-continuation-string)))
1226 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))))
1227 (while (and (setq not-first-statement (zerop (forward-line -1)))
1228 (or (looking-at fortran-comment-line-start-skip)
1229 (looking-at fortran-directive-re)
1232 (regexp-quote fortran-continuation-string)))
1233 (looking-at "[ \t]*$\\| \\{5\\}[^ 0\n]\\|\t[1-9]")
1234 (looking-at (concat "[ \t]*" comment-start-skip)))))
1235 (cond ((and continue-test
1236 (not not-first-statement))
1237 (message "Incomplete continuation statement."))
1239 (fortran-previous-statement))
1240 ((not not-first-statement)
1241 'first-statement))))
1243 (defun fortran-next-statement ()
1244 "Move point to beginning of the next Fortran statement.
1245 Returns 'last-statement if that statement is the last
1246 non-comment Fortran statement in the file, and nil otherwise.
1247 Directive lines are treated as comments."
1249 (let (not-last-statement)
1251 (while (and (setq not-last-statement
1252 (and (zerop (forward-line 1))
1254 (or (looking-at fortran-comment-line-start-skip)
1255 (looking-at fortran-directive-re)
1256 (looking-at "[ \t]*$\\| [^ 0\n]\\|\t[1-9]")
1257 (looking-at (concat "[ \t]*" comment-start-skip)))))
1258 (if (not not-last-statement)
1261 (defun fortran-looking-at-if-then ()
1262 "Return non-nil if at the start of a line with an IF ... THEN statement."
1263 ;; cf f90-looking-at-if-then.
1265 (i (fortran-beginning-if)))
1272 ;; Used in hs-special-modes-alist.
1273 (defun fortran-end-of-block (&optional num)
1274 "Move point forward to the end of the current code block.
1275 With optional argument NUM, go forward that many balanced blocks.
1276 If NUM is negative, go backward to the start of a block. Does
1277 not check for consistency of block types. Interactively, pushes
1278 mark before moving point."
1280 (if (interactive-p) (push-mark (point) t))
1281 (and num (< num 0) (fortran-beginning-of-block (- num)))
1282 (let ((case-fold-search t)
1285 (while (and (> count 0)
1287 (concat "\\(" fortran-blocks-re
1288 (if fortran-check-all-num-for-matching-do
1289 "\\|^[ \t]*[0-9]+" "")
1290 "\\|continue\\|end\\)\\>")
1293 (if (if (looking-at (concat "^[0-9 \t]*" fortran-if-start-re))
1294 (fortran-looking-at-if-then)
1295 (looking-at fortran-start-block-re))
1296 (setq count (1+ count))
1297 (if (or (looking-at fortran-end-block-re)
1298 (and (or (looking-at "^[0-9 \t]*continue")
1299 (and fortran-check-all-num-for-matching-do
1300 (looking-at "[ \t]*[0-9]+")))
1301 (fortran-check-for-matching-do)))
1302 (setq count (1- count))))
1304 (if (> count 0) (error "Missing block end"))))
1306 (defun fortran-beginning-of-block (&optional num)
1307 "Move point backwards to the start of the current code block.
1308 With optional argument NUM, go backward that many balanced
1309 blocks. If NUM is negative, go forward to the end of a block.
1310 Does not check for consistency of block types. Interactively,
1311 pushes mark before moving point."
1313 (if (interactive-p) (push-mark (point) t))
1314 (and num (< num 0) (fortran-end-of-block (- num)))
1315 (let ((case-fold-search t)
1318 (while (and (> count 0)
1320 (concat "\\(" fortran-blocks-re
1321 (if fortran-check-all-num-for-matching-do
1322 "\\|^[ \t]*[0-9]+" "")
1323 "\\|continue\\|end\\)\\>")
1326 (if (if (looking-at (concat "^[0-9 \t]*" fortran-if-start-re))
1327 (fortran-looking-at-if-then)
1328 (looking-at fortran-start-block-re))
1329 (setq count (1- count))
1330 (if (or (looking-at fortran-end-block-re)
1331 (and (or (looking-at "^[0-9 \t]*continue")
1332 (and fortran-check-all-num-for-matching-do
1333 (looking-at "[ \t]*[0-9]+")))
1334 (fortran-check-for-matching-do)))
1335 (setq count (1+ count)))))
1336 ;; Includes an un-named main program block.
1337 (if (> count 0) (error "Missing block start"))))
1340 (defun fortran-blink-match (regex keyword find-begin)
1341 "From a line matching REGEX, blink matching KEYWORD statement line.
1342 Use function FIND-BEGIN to match it."
1343 (let ((top-of-window (window-start))
1345 (case-fold-search t)
1348 (when (save-excursion
1350 (skip-chars-forward " \t0-9")
1352 (if (not (setq matching (funcall find-begin)))
1353 (setq message (concat "No matching " keyword "."))
1354 (if (< matching top-of-window)
1356 (goto-char matching)
1360 (buffer-substring (point)
1361 (line-end-position)))))))
1363 (message "%s" message)
1364 (goto-char matching)
1365 (sit-for blink-matching-delay)
1366 (goto-char end-point)))))
1368 (defun fortran-blink-matching-if ()
1369 "From an ENDIF or ELSE statement, blink the matching IF statement."
1370 (fortran-blink-match "e\\(nd[ \t]*if\\|lse\\([ \t]*if\\)?\\)\\b"
1371 "if" #'fortran-beginning-if))
1373 (defun fortran-blink-matching-do ()
1374 "From an ENDDO statement, blink the matching DO or DO WHILE statement."
1375 (fortran-blink-match "end[ \t]*do\\b" "do" #'fortran-beginning-do))
1377 (defun fortran-mark-do ()
1378 "Put mark at end of Fortran DO [WHILE]-ENDDO construct, point at beginning.
1379 The marks are pushed."
1381 (let (enddo-point do-point)
1382 (if (setq enddo-point (fortran-end-do))
1383 (if (not (setq do-point (fortran-beginning-do)))
1384 (message "No matching do.")
1385 (goto-char enddo-point)
1387 (goto-char do-point)))))
1389 (defun fortran-end-do ()
1390 "Search forward for first unmatched ENDDO.
1391 Return point or nil."
1392 (let ((case-fold-search t))
1393 (if (save-excursion (beginning-of-line)
1394 (skip-chars-forward " \t0-9")
1395 (looking-at "end[ \t]*do\\b"))
1401 (while (and (not (zerop count))
1402 (not (eq (fortran-next-statement) 'last-statement))
1403 ;; Keep local to subprogram.
1404 (not (and (looking-at fortran-end-prog-re)
1405 (fortran-check-end-prog-re))))
1406 (skip-chars-forward " \t0-9")
1407 (cond ((looking-at "end[ \t]*do\\b")
1408 (setq count (1- count)))
1410 "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[^0-9]")
1411 (setq count (1+ count)))))
1413 ;; All pairs accounted for.
1416 (defun fortran-beginning-do ()
1417 "Search backwards for first unmatched DO [WHILE].
1418 Return point or nil. Ignores labelled DO loops (ie DO 10 ... 10 CONTINUE)."
1419 (let ((case-fold-search t)
1420 (dostart-re "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[^0-9]"))
1423 (skip-chars-forward " \t0-9")
1424 (looking-at dostart-re))
1430 (while (and (not (zerop count))
1431 (not (eq (fortran-previous-statement) 'first-statement))
1432 ;; Keep local to subprogram.
1433 (not (and (looking-at fortran-end-prog-re)
1434 (fortran-check-end-prog-re))))
1435 (skip-chars-forward " \t0-9")
1436 (cond ((looking-at dostart-re)
1437 (setq count (1- count)))
1438 ;; Note labelled loop ends not considered.
1439 ((looking-at "end[ \t]*do\\b")
1440 (setq count (1+ count)))))
1442 ;; All pairs accounted for.
1445 (defun fortran-mark-if ()
1446 "Put mark at end of Fortran IF-ENDIF construct, point at beginning.
1447 The marks are pushed."
1449 (let (endif-point if-point)
1450 (if (setq endif-point (fortran-end-if))
1451 (if (not (setq if-point (fortran-beginning-if)))
1452 (message "No matching if.")
1453 ;; Set mark, move point.
1454 (goto-char endif-point)
1456 (goto-char if-point)))))
1458 (defun fortran-end-if ()
1459 "Search forwards for first unmatched ENDIF.
1460 Return point or nil."
1461 (let ((case-fold-search t))
1462 (if (save-excursion (beginning-of-line)
1463 (skip-chars-forward " \t0-9")
1464 (looking-at "end[ \t]*if\\b"))
1467 ;; Search for one. The point has been already been moved to first
1468 ;; letter on line but this should not cause troubles.
1471 (while (and (not (zerop count))
1472 (not (eq (fortran-next-statement) 'last-statement))
1473 ;; Keep local to subprogram.
1474 (not (and (looking-at fortran-end-prog-re)
1475 (fortran-check-end-prog-re))))
1476 (skip-chars-forward " \t0-9")
1477 (cond ((looking-at "end[ \t]*if\\b")
1478 (setq count (1- count)))
1479 ((looking-at fortran-if-start-re)
1482 (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
1483 (let (then-test) ; multi-line if-then
1486 (zerop (forward-line 1))
1487 ;; Search forward for then.
1488 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
1492 ".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
1494 (setq count (1+ count)))))))
1496 ;; All pairs accounted for.
1499 (defun fortran-beginning-if ()
1500 "Search backwards for first unmatched IF-THEN.
1501 Return point or nil."
1502 (let ((case-fold-search t))
1504 ;; May be sitting on multi-line if-then statement, first
1505 ;; move to beginning of current statement. Note:
1506 ;; `fortran-previous-statement' moves to previous statement
1507 ;; *unless* current statement is first one. Only move
1508 ;; forward if not first-statement.
1509 (if (not (eq (fortran-previous-statement) 'first-statement))
1510 (fortran-next-statement))
1511 (skip-chars-forward " \t0-9")
1513 (looking-at fortran-if-start-re)
1515 (or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
1516 ;; Multi-line if-then.
1519 (and (zerop (forward-line 1))
1520 ;; Search forward for then.
1521 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
1525 ".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
1532 (while (and (not (zerop count))
1533 (not (eq (fortran-previous-statement) 'first-statement))
1534 ;; Keep local to subprogram.
1535 (not (and (looking-at fortran-end-prog-re)
1536 (fortran-check-end-prog-re))))
1537 (skip-chars-forward " \t0-9")
1538 (cond ((looking-at fortran-if-start-re)
1541 (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
1542 (let (then-test) ; multi-line if-then
1545 (zerop (forward-line 1))
1546 ;; Search forward for then.
1547 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
1551 (concat ".*then\\b[ \t]*"
1552 "[^ \t(=a-z0-9]"))))))
1554 (setq count (1- count)))))
1555 ((looking-at "end[ \t]*if\\b")
1556 (setq count (1+ count)))))
1558 ;; All pairs accounted for.
1562 (defun fortran-indent-line ()
1563 "Indent current Fortran line based on its contents and on previous lines."
1565 (let ((cfi (fortran-calculate-indent)))
1568 (if (or (not (= cfi (fortran-current-line-indentation)))
1569 (and (re-search-forward "^[ \t]*[0-9]+" (+ (point) 4) t)
1570 (not (fortran-line-number-indented-correctly-p))))
1571 (fortran-indent-to-column cfi)
1573 (if (fortran-find-comment-start-skip)
1574 (fortran-indent-comment))))
1575 ;; Never leave point in left margin.
1576 (if (< (current-column) cfi)
1577 (move-to-column cfi))
1578 (and auto-fill-function
1579 (> (save-excursion (end-of-line) (current-column))
1584 (when fortran-blink-matching-if
1585 (fortran-blink-matching-if)
1586 (fortran-blink-matching-do))))
1588 (defun fortran-auto-fill ()
1589 "Function to use for `normal-auto-fill-function' in Fortran mode."
1590 (if (> (current-column) (current-fill-column))
1591 (let ((cfi (fortran-calculate-indent)))
1594 (if (or (not (= cfi (fortran-current-line-indentation)))
1595 (and (re-search-forward "^[ \t]*[0-9]+"
1597 (not (fortran-line-number-indented-correctly-p))))
1598 (fortran-indent-to-column cfi)
1600 (if (fortran-find-comment-start-skip)
1601 (fortran-indent-comment))))
1603 ;; Never leave point in left margin.
1604 (if (< (current-column) cfi)
1605 (move-to-column cfi)))))
1607 ;; Historically this was a separate function which advertised itself
1608 ;; as reindenting but only did so where `most likely to be necessary'.
1609 (defalias 'fortran-indent-new-line 'reindent-then-newline-and-indent)
1611 (defun fortran-indent-subprogram ()
1612 "Properly indent the Fortran subprogram containing point."
1616 (message "Indenting subprogram...")
1617 (indent-region (point) (mark) nil))
1618 (message "Indenting subprogram...done."))
1620 (defun fortran-calculate-indent ()
1621 "Calculates the Fortran indent column based on previous lines."
1622 (let (icol first-statement (case-fold-search t)
1623 (fortran-minimum-statement-indent
1624 (if indent-tabs-mode
1625 fortran-minimum-statement-indent-tab
1626 fortran-minimum-statement-indent-fixed)))
1628 (setq first-statement (fortran-previous-statement))
1630 (setq icol fortran-minimum-statement-indent)
1631 (if (= (point) (point-min))
1632 (setq icol fortran-minimum-statement-indent)
1633 (setq icol (fortran-current-line-indentation)))
1634 (skip-chars-forward " \t0-9")
1635 (cond ((looking-at "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?if[ \t]*(")
1636 (if (or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t_$(=a-z0-9]")
1637 (let (then-test) ; multi-line if-then
1638 (while (and (zerop (forward-line 1))
1639 ;; Search forward for then.
1640 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
1641 (not (setq then-test
1644 *[^ \t_$(=a-z0-9]")))))
1646 (setq icol (+ icol fortran-if-indent))))
1647 ((looking-at "else\\(if\\)?\\b")
1648 (setq icol (+ icol fortran-if-indent)))
1649 ((looking-at "select[ \t]*case[ \t](.*)")
1650 (setq icol (+ icol fortran-if-indent)))
1651 ((looking-at "case[ \t]*(.*)")
1652 (setq icol (+ icol fortran-if-indent)))
1653 ((looking-at "case[ \t]*default\\b")
1654 (setq icol (+ icol fortran-if-indent)))
1655 ((looking-at "\\(otherwise\\|else[ \t]*where\\)\\b")
1656 (setq icol (+ icol fortran-if-indent)))
1657 ((looking-at "where[ \t]*(.*)[ \t]*\n")
1658 (setq icol (+ icol fortran-if-indent)))
1659 ((looking-at "do\\b")
1660 (setq icol (+ icol fortran-do-indent)))
1662 "\\(structure\\|union\\|map\\|interface\\)\
1663 \\b[ \t]*[^ \t=(a-z]")
1664 (setq icol (+ icol fortran-structure-indent)))
1665 ((and (looking-at fortran-end-prog-re1)
1666 (fortran-check-end-prog-re))
1667 ;; Previous END resets indent to minimum.
1668 (setq icol fortran-minimum-statement-indent)))))
1671 (cond ((looking-at "[ \t]*$"))
1672 ;; Check for directive before comment, so as not to indent.
1673 ((looking-at fortran-directive-re)
1674 (setq fortran-minimum-statement-indent 0 icol 0))
1675 ((looking-at fortran-comment-line-start-skip)
1676 (cond ((eq fortran-comment-indent-style 'relative)
1677 (setq icol (+ icol fortran-comment-line-extra-indent)))
1678 ((eq fortran-comment-indent-style 'fixed)
1679 (setq icol (+ fortran-minimum-statement-indent
1680 fortran-comment-line-extra-indent))))
1681 (setq fortran-minimum-statement-indent 0))
1682 ((or (looking-at (concat "[ \t]*"
1684 fortran-continuation-string)))
1685 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
1686 (skip-chars-forward " \t")
1687 ;; Do not introduce extra whitespace into a broken string.
1689 (if (fortran-is-in-string-p (point))
1691 (+ icol fortran-continuation-indent))))
1693 ((and fortran-check-all-num-for-matching-do
1694 (looking-at "[ \t]*[0-9]+")
1695 (fortran-check-for-matching-do))
1696 (setq icol (- icol fortran-do-indent)))
1698 (skip-chars-forward " \t0-9")
1699 (cond ((looking-at "end[ \t]*\\(if\\|select\\|where\\)\\b")
1700 (setq icol (- icol fortran-if-indent)))
1701 ((looking-at "else\\(if\\)?\\b")
1702 (setq icol (- icol fortran-if-indent)))
1703 ((looking-at "case[ \t]*\\((.*)\\|default\\>\\)")
1704 (setq icol (- icol fortran-if-indent)))
1705 ((looking-at "\\(otherwise\\|else[ \t]*where\\)\\b")
1706 (setq icol (- icol fortran-if-indent)))
1707 ((and (looking-at "continue\\b")
1708 (fortran-check-for-matching-do))
1709 (setq icol (- icol fortran-do-indent)))
1710 ((looking-at "end[ \t]*do\\b")
1711 (setq icol (- icol fortran-do-indent)))
1712 ((looking-at "end[ \t]*\
1713 \\(structure\\|union\\|map\\|interface\\)\\b[ \t]*[^ \t=(a-z]")
1714 (setq icol (- icol fortran-structure-indent)))
1715 ((and (looking-at fortran-end-prog-re1)
1716 (fortran-check-end-prog-re)
1717 (not (= icol fortran-minimum-statement-indent)))
1718 (message "Warning: `end' not in column %d. Probably\
1719 an unclosed block." fortran-minimum-statement-indent))))))
1720 (max fortran-minimum-statement-indent icol)))
1723 (defun fortran-current-line-indentation ()
1724 "Indentation of current line, ignoring Fortran line number or continuation.
1725 This is the column position of the first non-whitespace character
1726 aside from the line number and/or column 5/8 line-continuation character.
1727 For comment lines, returns indentation of the first
1728 non-indentation text within the comment."
1731 (cond ((looking-at fortran-comment-line-start-skip)
1732 (goto-char (match-end 0))
1734 (if (stringp fortran-comment-indent-char)
1735 fortran-comment-indent-char
1736 (char-to-string fortran-comment-indent-char))))
1737 ((or (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
1738 (goto-char (match-end 0)))
1740 ;; Move past line number.
1741 (skip-chars-forward "[ \t0-9]")))
1742 ;; Move past whitespace.
1743 (skip-chars-forward " \t")
1746 (defun fortran-indent-to-column (col)
1747 "Indent current line to column COL.
1748 notes: 1) A non-zero/non-blank character in column 5 indicates a continuation
1749 line, and this continuation character is retained on indentation;
1750 2) If `fortran-continuation-string' is the first non-whitespace
1751 character, this is a continuation line;
1752 3) A non-continuation line which has a number as the first
1753 non-whitespace character is a numbered line.
1754 4) A TAB followed by a digit indicates a continuation line."
1757 (if (looking-at fortran-comment-line-start-skip)
1758 (if fortran-comment-indent-style
1759 (let* ((char (if (stringp fortran-comment-indent-char)
1760 (aref fortran-comment-indent-char 0)
1761 fortran-comment-indent-char))
1762 (chars (string ?\s ?\t char)))
1763 (goto-char (match-end 0))
1764 (skip-chars-backward chars)
1765 (delete-region (point) (progn (skip-chars-forward chars)
1767 (insert-char char (- col (current-column)))))
1768 (if (looking-at "\t[1-9]")
1769 (if indent-tabs-mode
1770 (goto-char (match-end 0))
1773 (insert fortran-continuation-string))
1774 (if (looking-at " \\{5\\}[^ 0\n]")
1775 (if indent-tabs-mode
1776 (progn (delete-char 6)
1777 (insert ?\t (fortran-numerical-continuation-char) 1))
1779 (delete-horizontal-space)
1780 ;; Put line number in columns 0-4, or
1781 ;; continuation character in column 5.
1783 ((looking-at (regexp-quote fortran-continuation-string))
1784 (if indent-tabs-mode
1787 (if indent-tabs-mode
1788 fortran-minimum-statement-indent-tab
1789 fortran-minimum-statement-indent-fixed))
1791 (insert-char (fortran-numerical-continuation-char) 1))
1794 ((looking-at "[0-9]+")
1795 (let ((extra-space (- 5 (- (match-end 0) (point)))))
1796 (if (< extra-space 0)
1797 (message "Warning: line number exceeds 5-digit limit.")
1798 (indent-to (min fortran-line-number-indent extra-space))))
1799 (skip-chars-forward "0-9")))))
1800 ;; Point is now after any continuation character or line number.
1801 ;; Put body of statement where specified.
1802 (delete-horizontal-space)
1804 ;; Indent any comment following code on the same line.
1805 (when (fortran-find-comment-start-skip)
1806 (goto-char (match-beginning 0))
1807 (unless (= (current-column) (fortran-comment-indent))
1808 (delete-horizontal-space)
1809 (indent-to (fortran-comment-indent)))))))
1811 (defun fortran-line-number-indented-correctly-p ()
1812 "Return t if current line's line number is correctly indented.
1813 Do not call if there is no line number."
1816 (skip-chars-forward " \t")
1817 (and (<= (current-column) fortran-line-number-indent)
1818 (or (= (current-column) fortran-line-number-indent)
1819 (progn (skip-chars-forward "0-9")
1820 (= (current-column) 5))))))
1822 (defun fortran-check-for-matching-do ()
1823 "When called from a numbered statement, return t if matching DO is found.
1824 Otherwise return nil."
1825 (let ((case-fold-search t)
1829 (when (looking-at "[ \t]*[0-9]+")
1830 (skip-chars-forward " \t")
1831 (skip-chars-forward "0") ; skip past leading zeros
1833 (buffer-substring (point) (progn
1834 (skip-chars-forward "0-9")
1840 (and (re-search-backward
1842 "\\(^[ \t0-9]*do[ \t]*0*"
1843 charnum "\\b\\)\\|" "\\(^[ \t]*0*"
1847 (concat "^[ \t0-9]*do[ \t]*0*"
1850 (defun fortran-find-comment-start-skip (&optional all)
1851 "Move to past `comment-start-skip' found on current line.
1852 Return non-nil if `comment-start-skip' found, nil if not.
1853 If ALL is nil, only match comments that start in column > 0."
1854 ;; Hopefully at some point we can just use the line below! -stef
1855 ;; (comment-search-forward (line-end-position) t))
1856 (when (or all comment-start-skip)
1858 (css (if comment-start-skip
1859 (concat fortran-comment-line-start-skip
1860 "\\|" comment-start-skip)
1861 fortran-comment-line-start-skip)))
1862 (when (re-search-forward css (line-end-position) t)
1863 (if (and (or all (> (match-beginning 0) (line-beginning-position)))
1864 (or (save-match-data
1865 (not (fortran-is-in-string-p (match-beginning 0))))
1866 ;; Recurse for rest of line.
1867 (fortran-find-comment-start-skip all)))
1872 ;; From: ralf@up3aud1.gwdg.de (Ralf Fassel)
1873 ;; Test if TAB format continuation lines work.
1874 (defun fortran-is-in-string-p (where)
1875 "Return non-nil if WHERE (a buffer position) is inside a Fortran string."
1879 ((bolp) nil) ; bol is never inside a string
1880 ((save-excursion ; comment lines too
1882 (looking-at fortran-comment-line-start-skip)) nil)
1883 (t (let ((parse-state '(0 nil nil nil nil nil 0))
1884 (quoted-comment-start (if comment-start
1885 (regexp-quote comment-start)))
1887 parse-limit end-of-line)
1888 ;; Move to start of current statement.
1889 (fortran-next-statement)
1890 (fortran-previous-statement)
1891 ;; Now parse up to WHERE.
1893 (if (or ;; Skip to next line if:
1895 (looking-at fortran-comment-line-start-skip)
1896 ;; - at end of line?
1898 ;; - not in a string and after comment-start?
1899 (and (not (nth 3 parse-state))
1901 (equal comment-start
1902 (char-to-string (preceding-char)))))
1903 (if (> (forward-line) 0)
1904 (setq not-done nil))
1906 ;; If we are at beginning of code line, skip any
1907 ;; whitespace, labels and tab continuation markers.
1908 (if (bolp) (skip-chars-forward " \t0-9"))
1909 ;; If we are in column <= 5 now, check for continuation char.
1910 (cond ((= 5 (current-column)) (forward-char 1))
1911 ((and (< (current-column) 5)
1912 (equal fortran-continuation-string
1913 (char-to-string (following-char)))
1915 ;; Find out parse-limit from here.
1916 (setq end-of-line (line-end-position))
1917 (setq parse-limit (min where end-of-line))
1918 ;; Parse max up to comment-start, if non-nil and in current line.
1921 (if (re-search-forward quoted-comment-start end-of-line t)
1922 (setq parse-limit (min (point) parse-limit)))))
1923 ;; Now parse if still in limits.
1924 (if (< (point) where)
1925 (setq parse-state (parse-partial-sexp
1926 (point) parse-limit nil nil parse-state))
1927 (setq not-done nil))))
1929 (nth 3 parse-state))))))
1931 ;; From old version.
1932 (defalias 'fortran-auto-fill-mode 'auto-fill-mode)
1934 (defun fortran-fill ()
1935 "Fill the current line at an appropriate point(s)."
1936 (let* ((auto-fill-function #'fortran-auto-fill)
1938 (bol (line-beginning-position))
1939 (eol (line-end-position))
1940 (bos (min eol (+ bol (fortran-current-line-indentation))))
1941 ;; If in a string at fill-column, break it either before the
1942 ;; initial quote, or at fill-col (if string is too long).
1946 ;; OK to break quotes on comment lines.
1947 (unless (looking-at fortran-comment-line-start-skip)
1948 (let (fcpoint start)
1949 (move-to-column fill-column)
1950 (when (fortran-is-in-string-p (setq fcpoint (point)))
1952 (re-search-backward "\\S\"\\s\"\\S\"?" bol t)
1954 (if fortran-break-before-delimiters
1957 (if (re-search-forward "\\S\"\\s\"\\S\"" eol t)
1959 ;; If the current string is longer than (fill-column
1960 ;; - 6) chars, break it at the fill column (else
1962 (if (> (- (point) start)
1963 (- fill-column 6 fortran-continuation-indent))
1966 ;; Decide where to split the line. If a position for a quoted
1967 ;; string was found above then use that, else break the line
1968 ;; before/after the last delimiter.
1972 ;; If f-b-b-d is t, have an extra column to play with,
1973 ;; since delimiter gets shifted to new line.
1974 (move-to-column (if fortran-break-before-delimiters
1980 ;; Adapted from f90-find-breakpoint.
1981 (re-search-backward fortran-break-delimiters-re bol)
1982 (if (not fortran-break-before-delimiters)
1983 (if (looking-at fortran-no-break-re)
1984 ;; Deal with cases such as "**" split over
1985 ;; fill-col. Simpler alternative would be
1986 ;; to start from (1- fill-column) above.
1987 (if (> (+ 2 (current-column)) fill-column)
1992 (or (looking-at fortran-no-break-re)
1994 ;; Line indented beyond fill-column?
1995 (when (<= (point) bos)
1996 (move-to-column (1+ fill-column))
1997 ;; What is this doing???
1998 (or (re-search-forward "[\t\n,'+-/*)=]" eol t)
2001 (re-search-forward "[ \t]" opoint t))
2003 ;; If we are in an in-line comment, don't break unless the
2004 ;; line of code is longer than it should be. Otherwise
2005 ;; break the line at the column computed above.
2007 ;; Need to use fortran-find-comment-start-skip to make sure that
2008 ;; quoted !'s don't prevent a break.
2009 (when (and (save-excursion
2011 (if (not (fortran-find-comment-start-skip))
2013 (goto-char (match-beginning 0))
2014 (>= (point) fill-point)))
2016 (goto-char fill-point)
2021 (min (1+ fill-column)
2022 (+ (fortran-calculate-indent)
2023 fortran-continuation-indent))))
2024 (goto-char fill-point)
2025 (fortran-break-line)
2028 (defun fortran-break-line ()
2029 "Call `fortran-split-line'. Joins continuation lines first, then refills."
2030 (let ((bol (line-beginning-position))
2033 (if (fortran-find-comment-start-skip)
2034 (delete-and-extract-region
2035 (match-beginning 0) (line-end-position))))))
2036 ;; Forward line 1 really needs to go to next non white line.
2037 (if (save-excursion (forward-line)
2038 (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
2041 (delete-region (point) (match-end 0))
2042 (delete-horizontal-space)
2044 (fortran-split-line))
2049 (delete-horizontal-space)
2050 (indent-to (fortran-comment-indent))
2051 (insert comment-string)))))
2053 (defun fortran-analyze-file-format ()
2054 "Return nil if fixed format is used, t if TAB formatting is used.
2055 Use `fortran-tab-mode-default' if no non-comment statements are found
2056 before the end or in the first `fortran-analyze-depth' lines."
2059 (goto-char (point-min))
2062 (eq (char-after) ?\t)
2063 (looking-at " \\{6\\}")
2064 (> i fortran-analyze-depth)))
2068 ((eq (char-after) ?\t) t)
2069 ((looking-at " \\{6\\}") nil)
2070 (t fortran-tab-mode-default)))))
2072 (defun fortran-fill-paragraph (&optional justify)
2073 "Fill surrounding comment block as paragraphs, else fill statement.
2074 Intended as the value of `fill-paragraph-function'.
2075 A comment block is filled by calling `fill-comment-paragraph' with
2076 argument JUSTIFY, otherwise `fortran-fill-statement' is called.
2077 Always returns non-nil (to prevent `fill-paragraph' being called)."
2079 (or (fill-comment-paragraph justify)
2080 (fortran-fill-statement)
2083 (defun fortran-fill-statement ()
2084 "Fill a Fortran statement up to `fill-column'."
2086 (let ((auto-fill-function #'fortran-auto-fill))
2087 (unless (save-excursion
2089 (or (looking-at "[ \t]*$")
2090 (looking-at fortran-comment-line-start-skip)
2091 (and comment-start-skip
2092 (looking-at (concat "[ \t]*" comment-start-skip)))))
2094 ;; Find beginning of statement.
2095 (fortran-next-statement)
2096 (fortran-previous-statement)
2097 ;; Re-indent initially.
2098 (fortran-indent-line)
2099 ;; Replace newline plus continuation field plus indentation with
2103 (fortran-remove-continuation)))
2104 (fortran-previous-statement)))
2105 (fortran-indent-line)))
2107 (defun fortran-strip-sequence-nos (&optional do-space)
2108 "Delete all text in column `fortran-line-length' (default 72) and up.
2109 This is assumed to be sequence numbers. Normally also deletes
2110 trailing whitespace after stripping such text. Supplying prefix
2111 arg DO-SPACE prevents stripping the whitespace."
2114 (goto-char (point-min))
2115 (while (re-search-forward (format "^.\\{%d\\}\\(.*\\)" fortran-line-length)
2117 (replace-match "" nil nil nil 1)
2118 (unless do-space (delete-horizontal-space)))))
2120 ;; This code used to live in add-log.el, but this is a better place
2122 (defun fortran-current-defun ()
2123 "Function to use for `add-log-current-defun-function' in Fortran mode."
2125 ;; We must be inside function body for this to work.
2126 (fortran-beginning-of-subprogram)
2127 (let ((case-fold-search t)) ; case-insensitive
2128 ;; Search for fortran subprogram start.
2129 (if (re-search-forward
2130 (concat "^[ \t]*\\(program\\|subroutine\\|function"
2131 "\\|[ \ta-z0-9*()]*[ \t]+function\\|"
2132 "\\(block[ \t]*data\\)\\)")
2133 (save-excursion (fortran-end-of-subprogram)
2136 (or (match-string-no-properties 2)
2138 ;; Move to EOL or before first left paren.
2139 (if (re-search-forward "[(\n]" nil t)
2140 (progn (backward-char)
2141 (skip-chars-backward " \t"))
2143 ;; Use the name preceding that.
2144 (buffer-substring-no-properties (point) (progn (backward-sexp)
2150 ;; arch-tag: 74935096-21c4-4cab-8ee5-6ef16090dc04
2151 ;;; fortran.el ends here