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98110b1f02
emacs/lisp/progmodes/fortran.el
Glenn Morris 98110b1f02 (fortran-previous-statement): Check for fortran-continuation-string. 
(fortran-calculate-indent): Do not add extra whitespace to strings
broken over lines.  Remove superfluous progn.
(fortran-fill): Handle long strings that must be broken over lines.
2003-04-13 13:11:24 +00:00

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;;; fortran.el --- Fortran mode for GNU Emacs
;; Copyright (c) 1986, 93, 94, 95, 97, 98, 99, 2000, 2001
;; Free Software Foundation, Inc.
;; Author: Michael D. Prange <prange@erl.mit.edu>
;; Maintainer: Glenn Morris <gmorris@ast.cam.ac.uk>
;; Keywords: languages
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; 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.
;;; Commentary:
;; This mode is documented in the Emacs manual.
;;
;; Note that it is for editing Fortran77 or Fortran90 fixed source
;; form. For editing Fortran 90 free format source, use `f90-mode'
;; (f90.el). It is meant to support the GNU Fortran language
;; implemented by g77 (its extensions to Fortran77 and
;; interpretations, e.g. of blackslash in strings).
;;; History:
;; Fortran mode was upgraded by Stephen A. Wood (saw@cebaf.gov).
;; We acknowledge many contributions and valuable suggestions by
;; Lawrence R. Dodd, Ralf Fassel, Ralph Finch, Stephen Gildea,
;; Dr. Anil Gokhale, Ulrich Mueller, Mark Neale, Eric Prestemon,
;; Gary Sabot and Richard Stallman.
;;; Code:
;; Todo:
;; * Tidy it all up (more)!
;; * Implement insertion and removal of statement continuations in
;; mixed f77/f90 style, with the first `&' past column 72 and the
;; second in column 6.
;; * Support any other extensions to f77 grokked by GNU Fortran I've missed.
(defgroup fortran nil
"Fortran mode for Emacs"
:link '(custom-manual "(emacs)Fortran")
:group 'languages)
(defgroup fortran-indent nil
"Indentation variables in Fortran mode"
:prefix "fortran-"
:group 'fortran)
(defgroup fortran-comment nil
"Comment-handling variables in Fortran mode"
:prefix "fortran-"
:group 'fortran)
;;;###autoload
(defcustom fortran-tab-mode-default nil
"*Default tabbing/carriage control style for empty files in Fortran mode.
A value of t specifies tab-digit style of continuation control.
A value of nil specifies that continuation lines are marked
with a character in column 6."
:type 'boolean
:group 'fortran-indent)
;; Buffer local, used to display mode line.
(defcustom fortran-tab-mode-string nil
"String to appear in mode line when TAB format mode is on."
:type '(choice (const nil) string)
:group 'fortran-indent)
(make-variable-buffer-local 'fortran-tab-mode-string)
(defcustom fortran-do-indent 3
"*Extra indentation applied to DO blocks."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-if-indent 3
"*Extra indentation applied to IF blocks."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-structure-indent 3
"*Extra indentation applied to STRUCTURE, UNION, MAP and INTERFACE blocks."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-continuation-indent 5
"*Extra indentation applied to Fortran continuation lines."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-comment-indent-style 'fixed
"*How to indent comments.
nil forces comment lines not to be touched,
`fixed' makes fixed comment indentation to `fortran-comment-line-extra-indent'
columns beyond `fortran-minimum-statement-indent-fixed' (for
`indent-tabs-mode' of nil) or `fortran-minimum-statement-indent-tab' (for
`indent-tabs-mode' of t), and
`relative' indents to current Fortran indentation plus
`fortran-comment-line-extra-indent'."
:type '(radio (const :tag "Untouched" nil) (const fixed) (const relative))
:group 'fortran-indent)
(defcustom fortran-comment-line-extra-indent 0
"*Amount of extra indentation for text within full-line comments."
:type 'integer
:group 'fortran-indent
:group 'fortran-comment)
(defcustom fortran-comment-line-start "C"
"*Delimiter inserted to start new full-line comment.
You might want to change this to \"*\", for instance."
:version "21.1"
:type 'string
:group 'fortran-comment)
;; This used to match preprocessor lines too, but that messes up
;; filling and doesn't seem to be necessary.
(defcustom fortran-comment-line-start-skip
"^[CcDd*!]\\(\\([^ \t\n]\\)\\2+\\)?[ \t]*"
"*Regexp to match the start of a full-line comment."
:version "21.1"
:type 'regexp
:group 'fortran-comment)
(defcustom fortran-directive-re
"^[ \t]*#.*"
"*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"
:type 'regexp
:group 'fortran-indent)
(defcustom fortran-minimum-statement-indent-fixed 6
"*Minimum statement indentation for fixed format continuation style."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-minimum-statement-indent-tab (max tab-width 6)
"*Minimum statement indentation for TAB format continuation style."
:type 'integer
:group 'fortran-indent)
;; Note that this is documented in the v18 manuals as being a string
;; of length one rather than a single character.
;; The code in this file accepts either format for compatibility.
(defcustom fortran-comment-indent-char " "
"*Single-character string inserted for Fortran comment indentation.
Normally a space."
:type 'string
:group 'fortran-comment)
(defcustom fortran-line-number-indent 1
"*Maximum indentation for Fortran line numbers.
5 means right-justify them within their five-column field."
:type 'integer
:group 'fortran-indent)
(defcustom fortran-check-all-num-for-matching-do nil
"*Non-nil causes all numbered lines to be treated as possible DO loop ends."
:type 'boolean
:group 'fortran)
(defcustom fortran-blink-matching-if nil
"*Non-nil causes \\[fortran-indent-line] on ENDIF statement to blink on matching IF.
Also, from an ENDDO statement blink on matching DO [WHILE] statement."
:type 'boolean
:group 'fortran)
(defcustom fortran-continuation-string "$"
"*Single-character string used for Fortran continuation lines.
In fixed format continuation style, this character is inserted in
column 6 by \\[fortran-split-line] to begin a continuation line.
Also, if \\[fortran-indent-line] finds this at the beginning of a line, it will
convert the line into a continuation line of the appropriate style.
Normally $."
:type 'string
:group 'fortran)
(defcustom fortran-comment-region "c$$$"
"*String inserted by \\[fortran-comment-region] at start of each \
line in region."
:type 'string
:group 'fortran-comment)
(defcustom fortran-electric-line-number t
"*Non-nil causes line number digits to be moved to the correct \
column as typed."
:type 'boolean
:group 'fortran)
(defvar fortran-column-ruler-fixed
"0 4 6 10 20 30 40 5\
0 60 70\n\
\[ ]|{ | | | | | | | | \
\| | | | |}\n"
"String displayed above current line by \\[fortran-column-ruler].
This variable used in fixed format mode.")
(defvar fortran-column-ruler-tab
"0 810 20 30 40 5\
0 60 70\n\
\[ ]| { | | | | | | | | \
\| | | | |}\n"
"String displayed above current line by \\[fortran-column-ruler].
This variable used in TAB format mode.")
(defvar fortran-analyze-depth 100
"Number of lines to scan to determine whether to use fixed or TAB \
format style.")
(defcustom fortran-break-before-delimiters t
"*Non-nil causes filling to break lines before delimiters."
:type 'boolean
:group 'fortran)
(defvar fortran-mode-syntax-table
(let ((table (make-syntax-table)))
;; We might like `;' to be punctuation (g77 multi-statement
;; lines), but that screws abbrevs.
(modify-syntax-entry ?\; "w" table)
(modify-syntax-entry ?\r " " table)
(modify-syntax-entry ?+ "." table)
(modify-syntax-entry ?- "." table)
(modify-syntax-entry ?= "." table)
(modify-syntax-entry ?* "." table)
(modify-syntax-entry ?/ "." table)
(modify-syntax-entry ?\' "\"" table)
(modify-syntax-entry ?\" "\"" table)
;; Consistent with GNU Fortran -- see the manual.
(modify-syntax-entry ?\\ "\\" table)
;; This might be better as punctuation, as for C, but this way you
;; can treat floating-point numbers as symbols.
(modify-syntax-entry ?. "_" table) ; e.g. `a.ne.b'
(modify-syntax-entry ?_ "_" table)
(modify-syntax-entry ?$ "_" table) ; esp. VMSisms
(modify-syntax-entry ?\! "<" table)
(modify-syntax-entry ?\n ">" table)
table)
"Syntax table in use in Fortran mode buffers.")
;; 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
;; standard comment will throw fontification off on the wrong track.
;; So we do syntactic fontification with regexps.
(defvar fortran-font-lock-keywords-1 nil
"Subdued level highlighting for Fortran mode.")
(defvar fortran-font-lock-keywords-2 nil
"Medium level highlighting for Fortran mode.")
(defvar fortran-font-lock-keywords-3 nil
"Gaudy level highlighting for Fortran mode.")
(defvar fortran-font-lock-syntactic-keywords nil
"`font-lock-syntactic-keywords' for Fortran.
These get fixed-format comments fontified.")
(let ((comment-chars "cd\\*") ; `d' for `debugging' comments
(fortran-type-types
(eval-when-compile
(let ((re (regexp-opt
(let ((simple-types
'("character" "byte" "integer" "logical"
"none" "real" "complex"
"double precision" "double complex"))
(structured-types '("structure" "union" "map"))
(other-types '("record" "dimension"
"parameter" "common" "save"
"external" "intrinsic" "data"
"equivalence")))
(append
(mapcar (lambda (x) (concat "implicit " x))
simple-types)
simple-types
(mapcar (lambda (x) (concat "end " x))
structured-types)
structured-types
other-types)))))
;; In the optimized regexp above, replace spaces by a
;; regexp for optional whitespace; regexp-opt would have
;; escaped that.
(mapconcat #'identity (split-string re) "[ \t]*"))))
(fortran-keywords
(eval-when-compile
(regexp-opt '("continue" "format" "end" "enddo" "if" "then"
"else" "endif" "elseif" "while" "inquire" "stop"
"return" "include" "open" "close" "read" "write"
"format" "print" "select" "case" "cycle" "exit"
"rewind" "backspace"))))
(fortran-logicals
(eval-when-compile
(regexp-opt '("and" "or" "not" "lt" "le" "eq" "ge" "gt" "ne"
"true" "false")))))
(setq fortran-font-lock-syntactic-keywords
;; Fixed format comments. (!-style handled normally.)
(list
(list (concat "^[" comment-chars "]") 0 '(11))
(list (concat "^[^" comment-chars "\t\n]" ".\\{71\\}"
"\\([^\n]+\\)")
1 '(11))))
(setq fortran-font-lock-keywords-1
(list
;; Program, subroutine and function declarations, plus calls.
(list (concat "\\<\\(block[ \t]*data\\|call\\|entry\\|function\\|"
"program\\|subroutine\\)\\>[ \t]*\\(\\sw+\\)?")
'(1 font-lock-keyword-face)
'(2 font-lock-function-name-face nil t))))
(setq fortran-font-lock-keywords-2
(append fortran-font-lock-keywords-1
(list
;; Fontify all type specifiers (must be first; see below).
(cons (concat "\\<\\(" fortran-type-types "\\)\\>")
'font-lock-type-face)
;; Fontify all builtin keywords (except logical, do
;; and goto; see below).
(concat "\\<\\(" fortran-keywords "\\)\\>")
;; Fontify all builtin operators.
(concat "\\.\\(" fortran-logicals "\\)\\.")
;; Fontify do/goto keywords and targets, and goto tags.
(list "\\<\\(do\\|go *to\\)\\>[ \t]*\\([0-9]+\\)?"
'(1 font-lock-keyword-face)
'(2 font-lock-constant-face nil t))
(cons "^ *\\([0-9]+\\)" 'font-lock-constant-face))))
(setq fortran-font-lock-keywords-3
(append
;; The list `fortran-font-lock-keywords-1'.
fortran-font-lock-keywords-1
;; Fontify all type specifiers plus their declared items.
(list
(list (concat "\\<\\(" fortran-type-types "\\)\\>[ \t(/]*\\(*\\)?")
;; Fontify the type specifier.
'(1 font-lock-type-face)
;; Fontify each declaration item (or just the /.../ block name).
`(font-lock-match-c-style-declaration-item-and-skip-to-next
;; Start after any *(...) expression.
(condition-case nil
(and (and (match-beginning ,(+ 2 (regexp-opt-depth
fortran-type-types)))
(forward-sexp))
(forward-sexp))
(error nil))
;; No need to clean up.
nil
;; Fontify as a variable name, functions are
;; fontified elsewhere.
(1 font-lock-variable-name-face nil t))))
;; Things extra to `fortran-font-lock-keywords-3'
;; (must be done first).
(list
;; Fontify goto-like `err=label'/`end=label' in read/write
;; statements.
'(", *\\(e\\(nd\\|rr\\)\\)\\> *\\(= *\\([0-9]+\\)\\)?"
(1 font-lock-keyword-face) (4 font-lock-constant-face nil t))
;; Highlight standard continuation character and in a
;; TAB-formatted line.
'("^ \\([^ 0]\\)" 1 font-lock-string-face)
'("^\t\\([1-9]\\)" 1 font-lock-string-face))
(list
;; cpp stuff (ugh)
;;; '("^# *[a-z]+" . font-lock-keyword-face))
`(,fortran-directive-re (0 font-lock-keyword-face t)))
;; The list `fortran-font-lock-keywords-2' less that for types
;; (see above).
(cdr (nthcdr (length fortran-font-lock-keywords-1)
fortran-font-lock-keywords-2)))))
(defvar fortran-font-lock-keywords fortran-font-lock-keywords-1
"Default expressions to highlight in Fortran mode.")
(defvar fortran-imenu-generic-expression
;; These patterns could be confused by sequence nos. in cols 72+ and
;; don't allow continuations everywhere.
(list
(list
nil
;; [This will be fooled by `end function' allowed by G77. Also,
;; it assumes sensible whitespace is employed.]
(concat
;; leading whitespace:
"^\\s-+\\("
;; function declaration with optional type, e.g. `real',
;; `real*4', character(*), `double precision':
"\\(\\sw\\|\\s-\\|[*()+]\\)*"
"\\<function\\|subroutine\\|entry\\|block\\s-*data\\|program\\)"
;; Possible statement continuation:
"[ \t" fortran-continuation-string "]+"
;; Variable to index:
"\\(\\sw+\\)")
3)
;; Un-named block data
(list nil "^\\s-+\\(block\\s-*data\\)\\s-*$" 1))
"Imenu generic expression for `imenu-default-create-index-function'.")
(defvar fortran-mode-map
(let ((map (make-sparse-keymap)))
(define-key map ";" 'fortran-abbrev-start)
(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-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)
(define-key map "\C-c\C-p" 'fortran-previous-statement)
(define-key map "\C-c\C-n" 'fortran-next-statement)
(define-key map "\C-c\C-d" 'fortran-join-line) ; like f90
(define-key map "\M-^" 'fortran-join-line) ; subvert delete-indentation
(define-key map "0" 'fortran-electric-line-number)
(define-key map "1" 'fortran-electric-line-number)
(define-key map "2" 'fortran-electric-line-number)
(define-key map "3" 'fortran-electric-line-number)
(define-key map "4" 'fortran-electric-line-number)
(define-key map "5" 'fortran-electric-line-number)
(define-key map "6" 'fortran-electric-line-number)
(define-key map "7" 'fortran-electric-line-number)
(define-key map "8" 'fortran-electric-line-number)
(define-key map "9" 'fortran-electric-line-number)
;; Menu
(easy-menu-define
fortran-mode-menu map ""
`("Fortran"
["Manual" (info "(emacs)Fortran")]
("Customization"
,(custom-menu-create 'fortran)
["Set" Custom-set t]
["Save" Custom-save t]
["Reset to Current" Custom-reset-current t]
["Reset to Saved" Custom-reset-saved t]
["Reset to Standard Settings" Custom-reset-standard t])
"----"
["Toggle Auto-fill" auto-fill-mode :style toggle
:selected auto-fill-function]
["Toggle abbrev-mode" abbrev-mode :style toggle :selected abbrev-mode]
"----"
["Comment-out Region" fortran-comment-region mark-active]
["Uncomment-out region"
(fortran-comment-region (region-beginning) (region-end) 1)
mark-active]
["Indent Region" indent-region mark-active]
["Indent Subprogram" fortran-indent-subprogram t]
"----"
["Beginning of Subprogram" fortran-beginning-of-subprogram t]
["End of Subprogram" fortran-end-of-subprogram t]
("Mark"
["Subprogram" mark-defun t]
["IF Block" fortran-mark-if t]
["DO Block" fortran-mark-do t])
["Narrow to Subprogram" narrow-to-defun t]
["Widen" widen t]
"----"
["Temporary column ruler" fortran-column-ruler t]
["72-column window" fortran-window-create t]
["Full Width Window"
(enlarge-window-horizontally (- (frame-width) (window-width)))
(< (window-width) (frame-width))]
["Momentary 72-column window" fortran-window-create-momentarily t]
"----"
["Break Line at Point" fortran-split-line t]
["Join Line" fortran-join-line t]
["Fill Statement/Comment" fill-paragraph t]
"----"
["Add imenu menu"
imenu-add-menubar-index (not (and (boundp 'imenu--index-alist)
imenu--index-alist))]))
map)
"Keymap used in Fortran mode.")
(defvar fortran-mode-abbrev-table
(let (abbrevs-changed)
(define-abbrev-table 'fortran-mode-abbrev-table nil)
;; Use the 6th arg (SYSTEM-FLAG) of define-abbrev if possible.
;; Only use `apply' to quieten the byte-compiler.
(mapcar
(function (lambda (element)
(condition-case nil
(apply 'define-abbrev fortran-mode-abbrev-table
(append element '(nil 0 t)))
(wrong-number-of-arguments
(apply 'define-abbrev fortran-mode-abbrev-table
(append element '(nil 0)))))))
'((";au" "automatic" )
(";b" "byte" )
(";bd" "block data" )
(";ch" "character" )
(";cl" "close" )
(";c" "continue" )
(";cm" "common" )
(";cx" "complex" )
(";df" "define" )
(";di" "dimension" )
(";do" "double" )
(";dc" "double complex" )
(";dp" "double precision" )
(";dw" "do while" )
(";e" "else" )
(";ed" "enddo" )
(";el" "elseif" )
(";en" "endif" )
(";eq" "equivalence" )
(";ew" "endwhere" )
(";ex" "external" )
(";ey" "entry" )
(";f" "format" )
(";fa" ".false." )
(";fu" "function" )
(";g" "goto" )
(";im" "implicit" )
(";ib" "implicit byte" )
(";ic" "implicit complex" )
(";ich" "implicit character")
(";ii" "implicit integer" )
(";il" "implicit logical" )
(";ir" "implicit real" )
(";inc" "include" )
(";in" "integer" )
(";intr" "intrinsic" )
(";l" "logical" )
(";n" "namelist" )
(";o" "open" ) ; was ;op
(";pa" "parameter" )
(";pr" "program" )
(";ps" "pause" )
(";p" "print" )
(";rc" "record" )
(";re" "real" )
(";r" "read" )
(";rt" "return" )
(";rw" "rewind" )
(";s" "stop" )
(";sa" "save" )
(";st" "structure" )
(";sc" "static" )
(";su" "subroutine" )
(";tr" ".true." )
(";ty" "type" )
(";vo" "volatile" )
(";w" "write" )
(";wh" "where" )))
fortran-mode-abbrev-table))
(eval-when-compile ; silence compiler
(defvar imenu-case-fold-search)
(defvar imenu-syntax-alist))
(defcustom fortran-mode-hook nil
"Hook run by Fortran mode."
:type 'hook
:group 'fortran)
;;;###autoload
(defun fortran-mode ()
"Major mode for editing Fortran code.
\\[fortran-indent-line] indents the current Fortran line correctly.
DO statements must not share a common CONTINUE.
Type ;? or ;\\[help-command] to display a list of built-in abbrevs for
Fortran keywords.
Key definitions:
\\{fortran-mode-map}
Variables controlling indentation style and extra features:
`comment-start'
If you want to use comments starting with `!',
set this to the string \"!\".
`fortran-do-indent'
Extra indentation within do blocks. (default 3)
`fortran-if-indent'
Extra indentation within if blocks. (default 3)
`fortran-structure-indent'
Extra indentation within structure, union, map and interface blocks.
(default 3)
`fortran-continuation-indent'
Extra indentation applied to continuation statements. (default 5)
`fortran-comment-line-extra-indent'
Amount of extra indentation for text within full-line comments. (default 0)
`fortran-comment-indent-style'
nil means don't change indentation of text in full-line comments,
fixed means indent that text at `fortran-comment-line-extra-indent' beyond
the value of `fortran-minimum-statement-indent-fixed' (for fixed
format continuation style) or `fortran-minimum-statement-indent-tab'
(for TAB format continuation style).
relative means indent at `fortran-comment-line-extra-indent' beyond the
indentation for a line of code.
(default 'fixed)
`fortran-comment-indent-char'
Single-character string to be inserted instead of space for
full-line comment indentation. (default \" \")
`fortran-minimum-statement-indent-fixed'
Minimum indentation for Fortran statements in fixed format mode. (def.6)
`fortran-minimum-statement-indent-tab'
Minimum indentation for Fortran statements in TAB format mode. (default 9)
`fortran-line-number-indent'
Maximum indentation for line numbers. A line number will get
less than this much indentation if necessary to avoid reaching
column 5. (default 1)
`fortran-check-all-num-for-matching-do'
Non-nil causes all numbered lines to be treated as possible \"continue\"
statements. (default nil)
`fortran-blink-matching-if'
Non-nil causes \\[fortran-indent-line] on an ENDIF statement to blink on
matching IF. Also, from an ENDDO statement, blink on matching DO [WHILE]
statement. (default nil)
`fortran-continuation-string'
Single-character string to be inserted in column 5 of a continuation
line. (default \"$\")
`fortran-comment-region'
String inserted by \\[fortran-comment-region] at start of each line in
region. (default \"c$$$\")
`fortran-electric-line-number'
Non-nil causes line number digits to be moved to the correct column
as typed. (default t)
`fortran-break-before-delimiters'
Non-nil causes lines to be broken before delimiters.
(default t)
Turning on Fortran mode calls the value of the variable `fortran-mode-hook'
with no args, if that value is non-nil."
(interactive)
(kill-all-local-variables)
(setq local-abbrev-table fortran-mode-abbrev-table)
(set-syntax-table fortran-mode-syntax-table)
;; Font Lock mode support.
(make-local-variable 'font-lock-defaults)
(setq font-lock-defaults '((fortran-font-lock-keywords
fortran-font-lock-keywords-1
fortran-font-lock-keywords-2
fortran-font-lock-keywords-3)
nil t ((?/ . "$/") ("_$" . "w"))
fortran-beginning-of-subprogram))
(set (make-local-variable 'font-lock-syntactic-keywords)
fortran-font-lock-syntactic-keywords)
(make-local-variable 'fortran-break-before-delimiters)
(setq fortran-break-before-delimiters t)
(make-local-variable 'indent-line-function)
(setq indent-line-function 'fortran-indent-line)
(make-local-variable 'comment-indent-function)
(setq comment-indent-function 'fortran-comment-indent)
(set (make-local-variable 'comment-start-skip)
;; We can't reuse `fortran-comment-line-start-skip' directly because
;; it contains backrefs whereas we need submatch-1 to end at the
;; beginning of the comment delimiter.
;; (concat "\\(\\)\\(![ \t]*\\|" fortran-comment-line-start-skip "\\)")
"\\(\\)\\(?:^[CcDd*]\\|!\\)\\(?:\\([^ \t\n]\\)\\2+\\)?[ \t]*")
(set (make-local-variable 'comment-padding) "$$$")
(set (make-local-variable 'comment-start) fortran-comment-line-start)
;; The syntax tables don't understand the column-0 comment-markers.
(set (make-local-variable 'comment-use-syntax) nil)
(make-local-variable 'require-final-newline)
(setq require-final-newline t)
(make-local-variable 'abbrev-all-caps)
(setq abbrev-all-caps t)
(make-local-variable 'indent-tabs-mode)
(setq indent-tabs-mode nil)
;;;(setq abbrev-mode t) ; ?? (abbrev-mode 1) instead??
(set (make-local-variable 'fill-column) 72)
(use-local-map fortran-mode-map)
(setq mode-name "Fortran")
(setq major-mode 'fortran-mode)
(make-local-variable 'fortran-comment-line-extra-indent)
(make-local-variable 'fortran-minimum-statement-indent-fixed)
(make-local-variable 'fortran-minimum-statement-indent-tab)
(make-local-variable 'fortran-column-ruler-fixed)
(make-local-variable 'fortran-column-ruler-tab)
(setq fortran-tab-mode-string " TAB-format")
(setq indent-tabs-mode (fortran-analyze-file-format))
(setq imenu-case-fold-search t)
(setq imenu-generic-expression fortran-imenu-generic-expression)
(setq imenu-syntax-alist '(("_$" . "w")))
(set (make-local-variable 'fill-paragraph-function) 'fortran-fill-paragraph)
(set (make-local-variable 'normal-auto-fill-function) 'fortran-auto-fill)
(set (make-local-variable 'indent-line-function) 'fortran-indent-line)
(set (make-local-variable 'indent-region-function)
(lambda (start end)
(let (fortran-blink-matching-if ; avoid blinking delay
indent-region-function)
(indent-region start end nil))))
(set (make-local-variable 'beginning-of-defun-function)
#'fortran-beginning-of-subprogram)
(set (make-local-variable 'end-of-defun-function)
#'fortran-end-of-subprogram)
(set (make-local-variable 'add-log-current-defun-function)
#'fortran-current-defun)
(set (make-local-variable 'dabbrev-case-fold-search) 'case-fold-search)
(run-hooks 'fortran-mode-hook))
(defsubst fortran-comment-indent ()
(save-excursion
(if (looking-at fortran-comment-line-start-skip) 0
(skip-chars-backward " \t")
(max (+ 1 (current-column))
comment-column))))
(defun fortran-indent-comment ()
"Align or create comment on current line.
Existing comments of all types are recognized and aligned.
If the line has no comment, a side-by-side comment is inserted and aligned
if the value of `comment-start' is not nil and allows such comments.
Otherwise, a separate-line comment is inserted, on this line
or on a new line inserted before this line if this line is not blank."
(interactive)
(beginning-of-line)
;; Recognize existing comments of either kind.
(cond ((fortran-find-comment-start-skip 'all)
(goto-char (match-beginning 0))
(if (bolp)
(fortran-indent-line)
(if (not (= (current-column)
(fortran-comment-indent)))
(progn (delete-horizontal-space)
(indent-to (fortran-comment-indent))))))
;; No existing comment.
;; If side-by-side comments are defined, insert one,
;; unless line is now blank.
((and comment-start (not (looking-at "[ \t]*$"))
(string-match comment-start-skip (concat " " comment-start)))
(end-of-line)
(delete-horizontal-space)
(indent-to (fortran-comment-indent))
(insert comment-start))
;; Else insert separate-line comment, making a new line if nec.
(t
(if (looking-at "^[ \t]*$")
(delete-horizontal-space)
(beginning-of-line)
(insert ?\n)
(forward-char -1))
(insert fortran-comment-line-start)
(insert-char (if (stringp fortran-comment-indent-char)
(aref fortran-comment-indent-char 0)
fortran-comment-indent-char)
(- (fortran-calculate-indent) (current-column))))))
(defun fortran-comment-region (beg-region end-region arg)
"Comments every line in the region.
Puts `fortran-comment-region' at the beginning of every line in the region.
BEG-REGION and END-REGION are args which specify the region boundaries.
With non-nil ARG, uncomments the region."
(interactive "*r\nP")
(let ((end-region-mark (copy-marker end-region))
(save-point (point-marker)))
(goto-char beg-region)
(beginning-of-line)
(if (not arg) ;comment the region
(progn (insert fortran-comment-region)
(while (and (= (forward-line 1) 0)
(< (point) end-region-mark))
(insert fortran-comment-region)))
(let ((com (regexp-quote fortran-comment-region))) ;uncomment the region
(if (looking-at com)
(delete-region (point) (match-end 0)))
(while (and (= (forward-line 1) 0)
(< (point) end-region-mark))
(if (looking-at com)
(delete-region (point) (match-end 0))))))
(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."
(interactive)
(let (c)
(insert last-command-char)
(if (and abbrev-mode
(or (eq (setq c (read-event)) ??) ;insert char if not equal to `?'
(eq c help-char)))
(fortran-abbrev-help)
(setq unread-command-events (list c)))))
(defun fortran-abbrev-help ()
"List the currently defined abbrevs in Fortran mode."
(interactive)
(message "Listing abbrev table...")
(display-buffer (fortran-prepare-abbrev-list-buffer))
(message "Listing abbrev table...done"))
(defun fortran-prepare-abbrev-list-buffer ()
(save-excursion
(set-buffer (get-buffer-create "*Abbrevs*"))
(erase-buffer)
(insert-abbrev-table-description 'fortran-mode-abbrev-table t)
(goto-char (point-min))
(set-buffer-modified-p nil)
(edit-abbrevs-mode))
(get-buffer-create "*Abbrevs*"))
(defun fortran-column-ruler ()
"Insert a column ruler momentarily above current line, till next keystroke.
The ruler is defined by the value of `fortran-column-ruler-fixed' when in fixed
format mode, and `fortran-column-ruler-tab' when in TAB format mode.
The key typed is executed unless it is SPC."
(interactive)
(momentary-string-display
(if indent-tabs-mode
fortran-column-ruler-tab
fortran-column-ruler-fixed)
(save-excursion
(beginning-of-line)
(if (eq (window-start (selected-window))
(window-point (selected-window)))
(line-beginning-position 2)
(point)))
nil "Type SPC or any command to erase ruler."))
(defun fortran-window-create ()
"Make the window 72 columns wide.
See also `fortran-window-create-momentarily'."
(interactive)
(let ((window-min-width 2))
(if (< (window-width) (frame-width))
(enlarge-window-horizontally (- (frame-width)
(window-width) 1)))
(let* ((window-edges (window-edges))
(scroll-bar-width (- (nth 2 window-edges)
(car window-edges)
(window-width))))
(split-window-horizontally (+ 72 scroll-bar-width)))
(other-window 1)
(switch-to-buffer " fortran-window-extra" t)
(select-window (previous-window))))
(defun fortran-window-create-momentarily (&optional arg)
"Momentarily make the window 72 columns wide.
Optional ARG non-nil and non-unity disables the momentary feature.
See also `fortran-window-create'."
(interactive "p")
(if (or (not arg)
(= arg 1))
(save-window-excursion
(progn
(condition-case nil
(fortran-window-create)
(error (error "No room for Fortran window")))
(message "Type SPC to continue editing.")
(let ((char (read-event)))
(or (equal char (string-to-char " "))
(setq unread-command-events (list char))))))
(fortran-window-create)))
(defun fortran-split-line ()
"Break line at point and insert continuation marker and alignment."
(interactive)
(delete-horizontal-space)
(if (save-excursion
(let ((pos (point)))
(beginning-of-line)
(and (fortran-find-comment-start-skip 'all)
(< (match-beginning 0) pos))))
(insert ?\n (match-string 0))
(if indent-tabs-mode
(insert ?\n ?\t (fortran-numerical-continuation-char))
(insert "\n " fortran-continuation-string))) ; Space after \n important
(fortran-indent-line)) ; when the cont string is C, c or *.
(defun fortran-remove-continuation ()
(if (looking-at "\\( [^ 0\n]\\|\t[1-9]\\|&\\)")
(progn (replace-match "")
(delete-indentation)
t)))
(defun fortran-join-line (arg)
"Join current line to the previous one and re-indent.
With a prefix argument, repeat this operation that many times.
If the prefix argument ARG is negative, join the next -ARG lines.
Continuation lines are correctly handled."
(interactive "*p")
(save-excursion
(when (> 0 arg)
(setq arg (- arg))
(forward-line arg))
(while (not (zerop arg))
(beginning-of-line)
(or (fortran-remove-continuation)
(delete-indentation))
(setq arg (1- arg)))
(fortran-indent-line)))
(defun fortran-numerical-continuation-char ()
"Return a digit for tab-digit style of continuation lines.
If, previous line is a tab-digit continuation line, returns that digit
plus one. Otherwise return 1. Zero not allowed."
(save-excursion
(forward-line -1)
(if (looking-at "\t[1-9]")
(+ ?1 (% (- (char-after (+ (point) 1)) ?0) 9))
?1)))
(put 'fortran-electric-line-number 'delete-selection t)
(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))
(if arg
(self-insert-command (prefix-numeric-value arg))
(self-insert-command 1))
(if (or (and (= 5 (current-column))
(save-excursion
(beginning-of-line)
(looking-at " \\{5\\}"))) ;In col 5 with only spaces to left.
(and (= (if indent-tabs-mode
fortran-minimum-statement-indent-tab
fortran-minimum-statement-indent-fixed) (current-column))
(eq ?\t (char-after (line-beginning-position))) ;In col 8
; with a single tab to the left.
(not (or (eq last-command 'fortran-indent-line)
(eq last-command
'fortran-indent-new-line))))
(save-excursion
(re-search-backward "[^ \t0-9]"
(line-beginning-position)
t)) ;not a line number
(looking-at "[0-9]")) ;within a line number
(self-insert-command (prefix-numeric-value arg))
(skip-chars-backward " \t")
(insert last-command-char)
(fortran-indent-line))))
(defvar fortran-end-prog-re1
"end\
\\([ \t]*\\(program\\|subroutine\\|function\\|block[ \t]*data\\)\\>\
\\([ \t]*\\(\\sw\\|\\s_\\)+\\)?\\)?")
(defvar fortran-end-prog-re
(concat "^[ \t0-9]*" fortran-end-prog-re1)
"Regexp possibly marking subprogram end.")
(defun fortran-check-end-prog-re ()
"Check a preliminary match against `fortran-end-prog-re'."
;; Having got a possible match for the subprogram end, we need a
;; match of whitespace, avoiding possible column 73+ stuff.
(save-match-data
(string-match "^\\s-*\\(\\'\\|\\s<\\)"
(buffer-substring (match-end 0)
(min (line-end-position)
(+ 72 (line-beginning-position)))))))
;; Note that you can't just check backwards for `subroutine' &c in
;; case of un-marked main programs not at the start of the file.
(defun fortran-beginning-of-subprogram ()
"Move point to the beginning of the current Fortran subprogram."
(interactive)
(save-match-data
(let ((case-fold-search t))
(beginning-of-line -1)
(if (catch 'ok
(while (re-search-backward fortran-end-prog-re nil 'move)
(if (fortran-check-end-prog-re)
(throw 'ok t))))
(forward-line)))))
(defun fortran-end-of-subprogram ()
"Move point to the end of the current Fortran subprogram."
(interactive)
(save-match-data
(let ((case-fold-search t))
(if (save-excursion ; on END
(beginning-of-line)
(and (looking-at fortran-end-prog-re)
(fortran-check-end-prog-re)))
(forward-line)
(beginning-of-line 2)
(catch 'ok
(while (re-search-forward fortran-end-prog-re nil 'move)
(if (fortran-check-end-prog-re)
(throw 'ok t))))
(goto-char (match-beginning 0))
(forward-line)))))
(defun fortran-previous-statement ()
"Move 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.
Directive lines are treated as comments."
(interactive)
(let (not-first-statement continue-test)
(beginning-of-line)
(setq continue-test
(and
(not (looking-at fortran-comment-line-start-skip))
(not (looking-at fortran-directive-re))
(or (looking-at
(concat "[ \t]*"
(regexp-quote fortran-continuation-string)))
(looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))))
(while (and (setq not-first-statement (= (forward-line -1) 0))
(or (looking-at fortran-comment-line-start-skip)
(looking-at fortran-directive-re)
(looking-at
(concat "[ \t]*"
(regexp-quote fortran-continuation-string)))
(looking-at "[ \t]*$\\| \\{5\\}[^ 0\n]\\|\t[1-9]")
(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 ()
"Move 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.
Directive lines are treated as comments."
(interactive)
(let (not-last-statement)
(beginning-of-line)
(while (and (setq not-last-statement
(and (= (forward-line 1) 0)
(not (eobp))))
(or (looking-at fortran-comment-line-start-skip)
(looking-at fortran-directive-re)
(looking-at "[ \t]*$\\| [^ 0\n]\\|\t[1-9]")
(looking-at (concat "[ \t]*" comment-start-skip)))))
(if (not not-last-statement)
'last-statement)))
(defun fortran-blink-match (regex keyword find-begin)
"From a line matching REGEX, blink matching KEYWORD statement line.
Use function FIND-BEGIN to match it."
(let ((top-of-window (window-start))
(end-point (point))
(case-fold-search t)
matching
message)
(if (save-excursion
(beginning-of-line)
(skip-chars-forward " \t0-9")
(looking-at regex))
(progn
(if (not (setq matching (funcall find-begin)))
(setq message (concat "No matching " keyword "."))
(if (< matching top-of-window)
(save-excursion
(goto-char matching)
(beginning-of-line)
(setq message
(concat "Matches "
(buffer-substring (point)
(line-end-position)))))))
(if message
(message "%s" message)
(goto-char matching)
(sit-for 1)
(goto-char end-point))))))
(defun fortran-blink-matching-if ()
"From an ENDIF or ELSE statement, blink the matching IF statement."
(fortran-blink-match "e\\(nd[ \t]*if\\|lse\\([ \t]*if\\)?\\)\\b"
"if" #'fortran-beginning-if))
(defun fortran-blink-matching-do ()
"From an ENDDO statement, blink the matching DO or DO WHILE statement."
(fortran-blink-match "end[ \t]*do\\b" "do" #'fortran-beginning-do))
(defun fortran-mark-do ()
"Put mark at end of Fortran DO [WHILE]-ENDDO construct, point at beginning.
The marks are pushed."
(interactive)
(let (enddo-point do-point)
(if (setq enddo-point (fortran-end-do))
(if (not (setq do-point (fortran-beginning-do)))
(message "No matching do.")
(goto-char enddo-point)
(push-mark)
(goto-char do-point)))))
(defun fortran-end-do ()
"Search forward for first unmatched ENDDO.
Return point or nil."
(let ((case-fold-search t))
(if (save-excursion (beginning-of-line)
(skip-chars-forward " \t0-9")
(looking-at "end[ \t]*do\\b"))
;; Sitting on one.
(match-beginning 0)
;; Search for one.
(save-excursion
(let ((count 1))
(while (and (not (= count 0))
(not (eq (fortran-next-statement) 'last-statement))
;; Keep local to subprogram
(not (and (looking-at fortran-end-prog-re)
(fortran-check-end-prog-re))))
(skip-chars-forward " \t0-9")
(cond ((looking-at "end[ \t]*do\\b")
(setq count (1- count)))
((looking-at
"\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[^0-9]")
(setq count (+ count 1)))))
(and (= count 0)
;; All pairs accounted for.
(point)))))))
(defun fortran-beginning-do ()
"Search backwards for first unmatched DO [WHILE].
Return point or nil. Ignores labelled DO loops (ie DO 10 ... 10 CONTINUE)."
(let ((case-fold-search t)
(dostart-re "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?do[ \t]+[^0-9]"))
(if (save-excursion
(beginning-of-line)
(skip-chars-forward " \t0-9")
(looking-at dostart-re))
;; Sitting on one.
(match-beginning 0)
;; Search for one.
(save-excursion
(let ((count 1))
(while (and (not (= count 0))
(not (eq (fortran-previous-statement) 'first-statement))
;; Keep local to subprogram
(not (and (looking-at fortran-end-prog-re)
(fortran-check-end-prog-re))))
(skip-chars-forward " \t0-9")
(cond ((looking-at dostart-re)
(setq count (1- count)))
;; Note labelled loop ends not considered.
((looking-at "end[ \t]*do\\b")
(setq count (1+ count)))))
(and (= count 0)
;; All pairs accounted for.
(point)))))))
(defun fortran-mark-if ()
"Put mark at end of Fortran IF-ENDIF construct, point at beginning.
The marks are pushed."
(interactive)
(let (endif-point if-point)
(if (setq endif-point (fortran-end-if))
(if (not (setq if-point (fortran-beginning-if)))
(message "No matching if.")
;; Set mark, move point.
(goto-char endif-point)
(push-mark)
(goto-char if-point)))))
(defvar fortran-if-start-re "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?if[ \t]*(")
(defun fortran-end-if ()
"Search forwards for first unmatched ENDIF.
Return point or nil."
(let ((case-fold-search t))
(if (save-excursion (beginning-of-line)
(skip-chars-forward " \t0-9")
(looking-at "end[ \t]*if\\b"))
;; Sitting on one.
(match-beginning 0)
;; Search for one. The point has been already been moved to first
;; letter on line but this should not cause troubles.
(save-excursion
(let ((count 1))
(while (and (not (= count 0))
(not (eq (fortran-next-statement) 'last-statement))
;; Keep local to subprogram.
(not (and (looking-at fortran-end-prog-re)
(fortran-check-end-prog-re))))
(skip-chars-forward " \t0-9")
(cond ((looking-at "end[ \t]*if\\b")
(setq count (- count 1)))
((looking-at fortran-if-start-re)
(save-excursion
(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 " \\{5\\}[^ 0\n]\\|\t[1-9]")
(not
(setq then-test
(looking-at
".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
then-test))
(setq count (+ count 1)))))))
(and (= count 0)
;; All pairs accounted for.
(point)))))))
(defun fortran-beginning-if ()
"Search backwards for first unmatched IF-THEN.
Return point or nil."
(let ((case-fold-search t))
(if (save-excursion
;; May be sitting on multi-line if-then statement, first
;; move to beginning of current statement. Note:
;; `fortran-previous-statement' moves to previous statement
;; *unless* current statement is first one. Only move
;; forward if not first-statement.
(if (not (eq (fortran-previous-statement) 'first-statement))
(fortran-next-statement))
(skip-chars-forward " \t0-9")
(and
(looking-at fortran-if-start-re)
(save-match-data
(or (looking-at ".*)[ \t]*then\\b[ \t]*[^ \t(=a-z0-9]")
;; Multi-line if-then.
(let (then-test)
(while
(and (= (forward-line 1) 0)
;; Search forward for then.
(looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]")
(not
(setq then-test
(looking-at
".*then\\b[ \t]*[^ \t(=a-z0-9]")))))
then-test)))))
;; Sitting on one.
(match-beginning 0)
;; Search for one.
(save-excursion
(let ((count 1))
(while (and (not (= count 0))
(not (eq (fortran-previous-statement) 'first-statement))
;; Keep local to subprogram.
(not (and (looking-at fortran-end-prog-re)
(fortran-check-end-prog-re))))
(skip-chars-forward " \t0-9")
(cond ((looking-at fortran-if-start-re)
(save-excursion
(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 " \\{5\\}[^ 0\n]\\|\t[1-9]")
(not
(setq then-test
(looking-at
(concat ".*then\\b[ \t]*"
"[^ \t(=a-z0-9]"))))))
then-test))
(setq count (- count 1)))))
((looking-at "end[ \t]*if\\b")
(setq count (+ count 1)))))
(and (= count 0)
;; All pairs accounted for.
(point)))))))
(defun fortran-indent-line ()
"Indent current Fortran line based on its contents and on previous lines."
(interactive)
(let ((cfi (fortran-calculate-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 (fortran-find-comment-start-skip)
(fortran-indent-comment))))
;; Never leave point in left margin.
(if (< (current-column) cfi)
(move-to-column cfi))
(if (and auto-fill-function
(> (save-excursion (end-of-line) (current-column))
fill-column))
(save-excursion
(end-of-line)
(fortran-fill)))
(if fortran-blink-matching-if
(progn
(fortran-blink-matching-if)
(fortran-blink-matching-do)))))
(defun fortran-auto-fill ()
(if (> (current-column) (current-fill-column))
(let ((cfi (fortran-calculate-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 (fortran-find-comment-start-skip)
(fortran-indent-comment))))
(fortran-fill)
;; Never leave point in left margin.
(if (< (current-column) cfi)
(move-to-column cfi)))))
;; Historically this was a separate function which advertised itself
;; as reindenting but only did so where `most likely to be necessary'.
(defalias 'fortran-indent-new-line 'reindent-then-newline-and-indent)
(defun fortran-indent-subprogram ()
"Properly indent the Fortran subprogram which contains point."
(interactive)
(save-excursion
(mark-defun)
(message "Indenting subprogram...")
(indent-region (point) (mark) nil))
(message "Indenting subprogram...done."))
(defun fortran-calculate-indent ()
"Calculates the Fortran indent column based on previous lines."
(let (icol first-statement (case-fold-search t)
(fortran-minimum-statement-indent
(if indent-tabs-mode
fortran-minimum-statement-indent-tab
fortran-minimum-statement-indent-fixed)))
(save-excursion
(setq first-statement (fortran-previous-statement))
(if first-statement
(setq icol fortran-minimum-statement-indent)
(if (= (point) (point-min))
(setq icol fortran-minimum-statement-indent)
(setq icol (fortran-current-line-indentation)))
(skip-chars-forward " \t0-9")
(cond ((looking-at "\\(\\(\\sw\\|\\s_\\)+:[ \t]*\\)?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 " \\{5\\}[^ 0\n]\\|\t[1-9]")
(not (setq then-test
(looking-at
".*then\\b[ \t]\
*[^ \t_$(=a-z0-9]")))))
then-test))
(setq icol (+ icol fortran-if-indent))))
((looking-at "else\\(if\\)?\\b")
(setq icol (+ icol fortran-if-indent)))
((looking-at "select[ \t]*case[ \t](.*)")
(setq icol (+ icol fortran-if-indent)))
((looking-at "case[ \t]*(.*)")
(setq icol (+ icol fortran-if-indent)))
((looking-at "case[ \t]*default\\b")
(setq icol (+ icol fortran-if-indent)))
((looking-at "\\(otherwise\\|else[ \t]*where\\)\\b")
(setq icol (+ icol fortran-if-indent)))
((looking-at "where[ \t]*(.*)[ \t]*\n")
(setq icol (+ icol fortran-if-indent)))
((looking-at "do\\b")
(setq icol (+ icol fortran-do-indent)))
((looking-at
"\\(structure\\|union\\|map\\|interface\\)\
\\b[ \t]*[^ \t=(a-z]")
(setq icol (+ icol fortran-structure-indent)))
((and (looking-at fortran-end-prog-re1)
(fortran-check-end-prog-re))
;; Previous END resets indent to minimum
(setq icol fortran-minimum-statement-indent)))))
(save-excursion
(beginning-of-line)
(cond ((looking-at "[ \t]*$"))
;; Check for directive before comment, so as not to indent.
((looking-at fortran-directive-re)
(setq fortran-minimum-statement-indent 0 icol 0))
((looking-at fortran-comment-line-start-skip)
(cond ((eq fortran-comment-indent-style 'relative)
(setq icol (+ icol fortran-comment-line-extra-indent)))
((eq fortran-comment-indent-style 'fixed)
(setq icol (+ fortran-minimum-statement-indent
fortran-comment-line-extra-indent))))
(setq fortran-minimum-statement-indent 0))
((or (looking-at (concat "[ \t]*"
(regexp-quote
fortran-continuation-string)))
(looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
(skip-chars-forward " \t")
;; Do not introduce extra whitespace into a broken string.
(setq icol
(if (fortran-is-in-string-p (point))
6
(+ 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\\|select\\|where\\)\\b")
(setq icol (- icol fortran-if-indent)))
((looking-at "else\\(if\\)?\\b")
(setq icol (- icol fortran-if-indent)))
((looking-at "case[ \t]*\\((.*)\\|default\\>\\)")
(setq icol (- icol fortran-if-indent)))
((looking-at "\\(otherwise\\|else[ \t]*where\\)\\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)))
((looking-at "end[ \t]*\
\\(structure\\|union\\|map\\|interface\\)\\b[ \t]*[^ \t=(a-z]")
(setq icol (- icol fortran-structure-indent)))
((and (looking-at fortran-end-prog-re1)
(fortran-check-end-prog-re)
(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 5/8 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 fortran-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))))
((or (looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
(goto-char (match-end 0)))
(t
;; Move past line number.
(skip-chars-forward "[ \t0-9]")))
;; Move past whitespace.
(skip-chars-forward " \t")
(current-column)))
(defun fortran-indent-to-column (col)
"Indent 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-string' 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.
4) A TAB followed by a digit indicates a continuation line."
(save-excursion
(beginning-of-line)
(if (looking-at fortran-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))
(chars (string ? ?\t char)))
(goto-char (match-end 0))
(skip-chars-backward chars)
(delete-region (point) (progn (skip-chars-forward chars)
(point)))
(insert-char char (- col (current-column)))))
(if (looking-at "\t[1-9]")
(if indent-tabs-mode
(goto-char (match-end 0))
(delete-char 2)
(insert-char ? 5)
(insert fortran-continuation-string))
(if (looking-at " \\{5\\}[^ 0\n]")
(if indent-tabs-mode
(progn (delete-char 6)
(insert ?\t (fortran-numerical-continuation-char) 1))
(forward-char 6))
(delete-horizontal-space)
;; Put line number in columns 0-4
;; or put continuation character in column 5.
(cond ((eobp))
((looking-at (regexp-quote fortran-continuation-string))
(if indent-tabs-mode
(progn
(indent-to
(if indent-tabs-mode
fortran-minimum-statement-indent-tab
fortran-minimum-statement-indent-fixed))
(delete-char 1)
(insert-char (fortran-numerical-continuation-char) 1))
(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 (fortran-find-comment-start-skip)
(progn (goto-char (match-beginning 0))
(if (not (= (current-column) (fortran-comment-indent)))
(progn (delete-horizontal-space)
(indent-to (fortran-comment-indent)))))))))
(defun fortran-line-number-indented-correctly-p ()
"Return t if current line's line number is correctly indented.
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, return t if matching DO is found.
Otherwise return nil."
(let ((case-fold-search t)
charnum)
(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)
(save-restriction
(save-excursion
(narrow-to-defun)
(and (re-search-backward
(concat
"\\(^[ \t0-9]*do[ \t]*0*"
charnum "\\b\\)\\|" "\\(^[ \t]*0*"
charnum "\\b\\)")
nil t)
(looking-at
(concat "^[ \t0-9]*do[ \t]*0*"
charnum))))))))))
(defun fortran-find-comment-start-skip (&optional all)
"Move to past `comment-start-skip' found on current line.
Return non-nil if `comment-start-skip' found, nil if not.
If ALL is nil, only match comments that start in column > 0."
(interactive)
;; Hopefully at some point we can just use the line below! -stef
;; (comment-search-forward (line-end-position) t))
(when (or all comment-start-skip)
(let ((pos (point))
(css (if comment-start-skip
(concat fortran-comment-line-start-skip
"\\|" comment-start-skip)
fortran-comment-line-start-skip)))
(when (re-search-forward css (line-end-position) t)
(if (and (or all (> (match-beginning 0) (line-beginning-position)))
(or (save-match-data
(not (fortran-is-in-string-p (match-beginning 0))))
;; Recurse for rest of line.
(fortran-find-comment-start-skip all)))
(point)
(goto-char pos)
nil)))))
;;From: ralf@up3aud1.gwdg.de (Ralf Fassel)
;; Test if TAB format continuation lines work.
(defun fortran-is-in-string-p (where)
"Return non-nil iff WHERE (a buffer position) is inside a Fortran string."
(save-excursion
(goto-char where)
(cond
((bolp) nil) ; bol is never inside a string
((save-excursion ; comment lines too
(beginning-of-line)
(looking-at fortran-comment-line-start-skip)) nil)
(t (let (;; ok, serious now. Init some local vars:
(parse-state '(0 nil nil nil nil nil 0))
(quoted-comment-start (if comment-start
(regexp-quote comment-start)))
(not-done t)
parse-limit end-of-line)
;; move to start of current statement
(fortran-next-statement)
(fortran-previous-statement)
;; now parse up to WHERE
(while not-done
(if (or ;; skip to next line if:
;; - comment line?
(looking-at fortran-comment-line-start-skip)
;; - at end of line?
(eolp)
;; - not in a string and after comment-start?
(and (not (nth 3 parse-state))
comment-start
(equal comment-start
(char-to-string (preceding-char)))))
(if (> (forward-line) 0)
(setq not-done nil))
;; else:
;; if we are at beginning of code line, skip any
;; whitespace, labels and tab continuation markers.
(if (bolp) (skip-chars-forward " \t0-9"))
;; if we are in column <= 5 now, check for continuation char
(cond ((= 5 (current-column)) (forward-char 1))
((and (< (current-column) 5)
(equal fortran-continuation-string
(char-to-string (following-char)))
(forward-char 1))))
;; find out parse-limit from here
(setq end-of-line (line-end-position))
(setq parse-limit (min where end-of-line))
;; parse max up to comment-start, if non-nil and in current line
(if comment-start
(save-excursion
(if (re-search-forward quoted-comment-start end-of-line t)
(setq parse-limit (min (point) parse-limit)))))
;; now parse if still in limits
(if (< (point) where)
(setq parse-state (parse-partial-sexp
(point) parse-limit nil nil parse-state))
(setq not-done nil))))
;; result is
(nth 3 parse-state))))))
;; From old version.
(defalias 'fortran-auto-fill-mode 'auto-fill-mode)
(defun fortran-fill ()
(let* ((auto-fill-function #'fortran-auto-fill)
(opoint (point))
(bol (line-beginning-position))
(eol (line-end-position))
(bos (min eol (+ bol (fortran-current-line-indentation))))
(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))))))
;; 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.
(fill-point
(or quote
(save-excursion
(move-to-column (1+ fill-column))
(skip-chars-backward "^ \t\n,'+-/*=)"
;;; (if fortran-break-before-delimiters
;;; "^ \t\n,'+-/*=" "^ \t\n,'+-/*=)")
)
(when (<= (point) (1+ 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)))))))
;; 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.
;;
;; Need to use fortran-find-comment-start-skip to make sure that quoted !'s
;; don't prevent a break.
(when (and (save-excursion
(beginning-of-line)
(if (not (fortran-find-comment-start-skip))
t
(goto-char (match-beginning 0))
(>= (point) fill-point)))
(save-excursion
(goto-char fill-point)
(not (bolp)))
(> (save-excursion
(goto-char opoint)
(current-column))
(min (1+ fill-column)
(+ (fortran-calculate-indent)
fortran-continuation-indent))))
(goto-char fill-point)
(fortran-break-line)
(end-of-line))))
(defun fortran-break-line ()
(let ((opoint (point))
(bol (line-beginning-position))
(comment-string
(save-excursion
(if (fortran-find-comment-start-skip)
(delete-and-extract-region
(match-beginning 0) (line-end-position))))))
;; Forward line 1 really needs to go to next non white line
(if (save-excursion (forward-line)
(looking-at " \\{5\\}[^ 0\n]\\|\t[1-9]"))
(progn
(end-of-line)
(delete-region (point) (match-end 0))
(delete-horizontal-space)
(fortran-fill))
(fortran-split-line))
(if comment-string
(save-excursion
(goto-char bol)
(end-of-line)
(delete-horizontal-space)
(indent-to (fortran-comment-indent))
(insert comment-string)))))
(defun fortran-analyze-file-format ()
"Return nil if fixed format is used, t if TAB formatting is used.
Use `fortran-tab-mode-default' if no non-comment statements are found in the
file before the end or the first `fortran-analyze-depth' lines."
(let ((i 0))
(save-excursion
(goto-char (point-min))
(setq i 0)
(while (not (or
(eobp)
(eq (char-after) ?\t)
(looking-at " \\{6\\}")
(> i fortran-analyze-depth)))
(forward-line)
(setq i (1+ i)))
(cond
((eq (char-after) ?\t) t)
((looking-at " \\{6\\}") nil)
(fortran-tab-mode-default t)
(t nil)))))
(or (assq 'fortran-tab-mode-string minor-mode-alist)
(setq minor-mode-alist (cons
'(fortran-tab-mode-string
(indent-tabs-mode fortran-tab-mode-string))
minor-mode-alist)))
(defun fortran-fill-paragraph (&optional justify)
"Fill surrounding comment block as paragraphs, else fill statement.
Intended as the value of `fill-paragraph-function'."
(interactive "P")
(or (fill-comment-paragraph justify)
(fortran-fill-statement)
t))
(defun fortran-fill-statement ()
"Fill a fortran statement up to `fill-column'."
(interactive)
(let ((auto-fill-function #'fortran-auto-fill))
(if (not (save-excursion
(beginning-of-line)
(or (looking-at "[ \t]*$")
(looking-at fortran-comment-line-start-skip)
(and comment-start-skip
(looking-at (concat "[ \t]*" comment-start-skip))))))
(save-excursion
;; Find beginning of statement.
(fortran-next-statement)
(fortran-previous-statement)
;; Re-indent initially.
(fortran-indent-line)
;; Replace newline plus continuation field plus indentation with
;; single space.
(while (progn
(forward-line)
(fortran-remove-continuation)))
(fortran-previous-statement)))
(fortran-indent-line)))
(defun fortran-strip-sequence-nos (&optional do-space)
"Delete all text in column 72 and up (assumed to be sequence numbers).
Normally also deletes trailing whitespace after stripping such text.
Supplying prefix arg DO-SPACE prevents stripping the whitespace."
(interactive "p")
(save-excursion
(goto-char (point-min))
(while (re-search-forward "^.\\{72\\}\\(.*\\)" nil t)
(replace-match "" nil nil nil 1)
(unless do-space (delete-horizontal-space)))))
;; This code used to live in add-log.el, but this is a better place
;; for it.
(defun fortran-current-defun ()
"Function to use for `add-log-current-defun-function' in Fortran mode."
(save-excursion
;; We must be inside function body for this to work.
(fortran-beginning-of-subprogram)
(let ((case-fold-search t)) ; case-insensitive
;; search for fortran subprogram start
(if (re-search-forward
(concat "^[ \t]*\\(program\\|subroutine\\|function"
"\\|[ \ta-z0-9*()]*[ \t]+function\\|"
"\\(block[ \t]*data\\)\\)")
(save-excursion (fortran-end-of-subprogram)
(point))
t)
(or (match-string-no-properties 2)
(progn
;; move to EOL or before first left paren
(if (re-search-forward "[(\n]" nil t)
(progn (backward-char)
(skip-chars-backward " \t"))
(end-of-line))
;; Use the name preceding that.
(buffer-substring-no-properties (point) (progn (backward-sexp)
(point)))))
"main"))))
(provide 'fortran)
;;; fortran.el ends here
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