;;; f90.el --- Fortran-90 mode (free format)

;; Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.

;; Author: Torbj\"orn Einarsson <Torbjorn.Einarsson@era.ericsson.se>
;; Maintainer: Glenn Morris <gmorris@ast.cam.ac.uk>
;; Keywords: fortran, f90, 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:

;; Smart mode for editing F90 programs in FREE FORMAT.
;; Knows about continuation lines, named structured statements, and other
;; new features in F90 including HPF (High Performance Fortran) structures.
;; The basic feature is to provide an accurate indentation of F90 programs.
;; In addition, there are many more features like automatic matching of all
;; end statements, an auto-fill function to break long lines, a join-lines
;; function which joins continued lines etc etc.
;;  To facilitate typing, a fairly complete list of abbreviations is provided.
;;    For example, `i is short-hand for integer (if abbrev-mode is on).

;; There are two separate features for highlighting the code.
;;   1) Upcasing or capitalizing of all keywords.
;;   2) Colors/fonts using font-lock-mode. (only when using X-windows)
;;  Automatic upcase of downcase of keywords is controlled by the parameter
;;  f90-auto-keyword-case.

;; The indentations of lines starting with ! is determined by the first of the
;; following matches (the values in the left column are the default values):

;; start-string/regexp  indent         variable holding start-string/regexp
;;    !!!                  0
;;    !hpf\\$ (re)         0              f90-directive-comment-re
;;    !!$                  0              f90-comment-region
;;    !      (re)        as code          f90-indented-comment-re
;;    default            comment-column

;; Ex: Here is the result of 3 different settings of f90-indented-comment-re
;;     f90-indented-comment-re  !-indentation      !!-indentation
;;          !                    as code             as code
;;          !!                   comment-column      as code
;;          ![^!]                as code             comment-column
;; Trailing comments are indented to comment-column with indent-for-comment M-;
;; f90-comment-region (C-c;) toggles insertion of f90-comment-region in region.

;; One common convention for free vs. fixed format is that free-format files
;; have the ending .f90 while the fixed format files have the ending .f. 
;; To make f90-mode work, put this file in, for example, your directory
;;  ~/lisp, and be sure that you have the following in your .emacs-file
;;     (setq load-path (append load-path '("~/lisp")))
;;     (autoload 'f90-mode "f90"
;;       "Major mode for editing Fortran 90 code in free format." t)
;;     (setq auto-mode-alist (append auto-mode-alist 
;;                           (list '("\\.f90$" . f90-mode))))
;; Once you have entered f90-mode, you may get more info by using
;; the command describe-mode (C-h m). For online help describing various
;; functions use  C-h f <Name of function you want described>

;; To customize the f90-mode for your taste, use, for example:
;;    (you don't have to specify values for all the parameters below)
;;(add-hook 'f90-mode-hook
;;      '(lambda () (setq f90-do-indent 3
;;                        f90-if-indent 3
;;                        f90-type-indent 3
;;                        f90-program-indent 2
;;                        f90-continuation-indent 5
;;                        f90-comment-region "!!$"
;;                        f90-directive-comment-re "!hpf\\$"
;;                        f90-indented-comment-re "!"
;;                        f90-break-delimiters "[-+\\*/,><=% \t]"
;;                        f90-break-before-delimiters t
;;                        f90-beginning-ampersand t
;;                        f90-smart-end 'blink
;;                        f90-auto-keyword-case nil
;;                        f90-leave-line-no  nil
;;                        f90-startup-message t
;;                        indent-tabs-mode nil
;;                        f90-font-lock-keywords f90-font-lock-keywords-2
;;                  )
;;       ;;The rest is not default.
;;       (abbrev-mode 1)             ; turn on abbreviation mode
;;       (f90-add-imenu-menu)        ; extra menu with functions etc.
;;       (if f90-auto-keyword-case   ; change case of all keywords on startup
;;           (f90-change-keywords f90-auto-keyword-case))
;;	 ))
;; in your .emacs file (the shown values are the defaults). You can also
;; change the values of the lists f90-keywords etc.
;; The auto-fill and abbreviation minor modes are accessible from the menu,
;; or by using M-x auto-fill-mode and M-x abbrev-mode, respectively.

;; Remarks
;; 1) Line numbers are by default left-justified. If f90-leave-line-no is
;;    non-nil, the line numbers are never touched.
;; 2) Multi-; statements like > do i=1,20 ; j=j+i ; end do < are not handled
;;    correctly, but I imagine them to be rare.
;; 3) Regexps for hilit19 are no longer supported.
;; 4) For FIXED FORMAT code, use the ordinary fortran mode.
;; 5) This mode does not work under emacs-18.x.
;; 6) Preprocessor directives, i.e., lines starting with # are left-justified
;;    and are untouched by all case-changing commands. There is, at present, no
;;    mechanism for treating multi-line directives (continued by \ ).
;; 7) f77 do-loops do 10 i=.. ; ; 10 continue are not correctly indented.
;;    You are urged to use f90-do loops (with labels if you wish).
;; 8) The highlighting mode under XEmacs is not as complete as under Emacs.

;; List of user commands
;;   f90-previous-statement         f90-next-statement
;;   f90-beginning-of-subprogram    f90-end-of-subprogram   f90-mark-subprogram
;;   f90-comment-region
;;   f90-indent-line                f90-indent-new-line
;;   f90-indent-region    (can be called by calling indent-region)
;;   f90-indent-subprogram
;;   f90-break-line                 f90-join-lines
;;   f90-fill-region
;;   f90-insert-end
;;   f90-upcase-keywords            f90-upcase-region-keywords
;;   f90-downcase-keywords          f90-downcase-region-keywords
;;   f90-capitalize-keywords        f90-capitalize-region-keywords
;;   f90-add-imenu-menu
;;   f90-font-lock-1, f90-font-lock-2, f90-font-lock-3, f90-font-lock-4

;; Thanks to all the people who have tested the mode. Special thanks to Jens
;; Bloch Helmers for encouraging me to write this code, for creative
;; suggestions as well as for the lists of hpf-commands.
;; Also thanks to the authors of the fortran and pascal modes, on which some
;; of this code is built.

;;; Code:

;; User options

(defgroup f90 nil
  "Fortran-90 mode"
  :group 'languages)

(defgroup f90-indent nil
  "Fortran-90 indentation"
  :prefix "f90-"
  :group 'f90)


(defcustom f90-do-indent 3
  "*Extra indentation applied to DO blocks."
  :type 'integer
  :group 'f90-indent)

(defcustom f90-if-indent 3
  "*Extra indentation applied to IF, SELECT CASE, WHERE and FORALL blocks."
  :type 'integer
  :group 'f90-indent)

(defcustom f90-type-indent 3
  "*Extra indentation applied to TYPE, INTERFACE and BLOCK DATA blocks."
  :type 'integer
  :group 'f90-indent)

(defcustom f90-program-indent 2
  "*Extra indentation applied to PROGRAM/MODULE/SUBROUTINE/FUNCTION blocks."
  :type 'integer
  :group 'f90-indent)

(defcustom f90-continuation-indent 5
  "*Extra indentation applied to F90 continuation lines."
  :type 'integer
  :group 'f90-indent)

(defcustom f90-comment-region "!!$"
  "*String inserted by \\[f90-comment-region]\
 at start of each line in region."
  :type 'string
  :group 'f90-indent)

(defcustom f90-indented-comment-re "!"
  "*Regexp saying which comments to be indented like code."
  :type 'regexp
  :group 'f90-indent)

(defcustom f90-directive-comment-re "!hpf\\$"
  "*Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented."
  :type 'regexp
  :group 'f90-indent)

(defcustom f90-beginning-ampersand t
  "*t makes automatic insertion of \& at beginning of continuation line."
  :type 'boolean
  :group 'f90)

(defcustom f90-smart-end 'blink
  "*From an END statement, check and fill the end using matching block start.
Allowed values are 'blink, 'no-blink, and nil, which determine
whether to blink the matching beginning."
  :type '(choice (const blink) (const no-blink) (const nil))
  :group 'f90)

(defcustom f90-break-delimiters "[-+\\*/><=,% \t]"
  "*Regexp holding list of delimiters at which lines may be broken."
  :type 'regexp
  :group 'f90)

(defcustom f90-break-before-delimiters t
  "*Non-nil causes `f90-do-auto-fill' to break lines before delimiters."
  :type 'boolean
  :group 'f90)

(defcustom f90-auto-keyword-case nil
  "*Automatic case conversion of keywords.
  The options are 'downcase-word, 'upcase-word, 'capitalize-word and nil"
  :type '(choice (const downcase-word) (const upcase-word)
		 (const capitalize-word) (const nil))
  :group 'f90)

(defcustom f90-leave-line-no nil
  "*If nil, left-justify linenumbers."
  :type 'boolean
  :group 'f90)

(defcustom f90-startup-message t
  "*Non-nil displays a startup message when F90 mode is first called."
  :type 'boolean
  :group 'f90)

(defconst f90-keywords-re
  (regexp-opt '("allocatable" "allocate" "assign" "assignment" "backspace"
		"block" "call" "case" "character" "close" "common" "complex"
		"contains" "continue" "cycle" "data" "deallocate"
		"dimension" "do" "double" "else" "elseif" "elsewhere" "end"
		"enddo" "endfile" "endif" "entry" "equivalence" "exit"
		"external" "forall" "format" "function" "goto" "if"
		"implicit" "include" "inquire" "integer" "intent"
		"interface" "intrinsic" "logical" "module" "namelist" "none"
		"nullify" "only" "open" "operator" "optional" "parameter"
		"pause" "pointer" "precision" "print" "private" "procedure"
		"program" "public" "read" "real" "recursive" "result" "return"
		"rewind" "save" "select" "sequence" "stop" "subroutine"
		"target" "then" "type" "use" "where" "while" "write"
		;; F95 keywords.
		"elemental" "pure") 'words)
  "Regexp for F90 keywords.")

(defconst f90-keywords-level-3-re
  (regexp-opt
   '("allocatable" "allocate" "assign" "assignment" "backspace"
     "close" "deallocate" "dimension" "endfile" "entry" "equivalence"
     "external" "inquire" "intent" "intrinsic" "nullify" "only" "open"
     "operator" "optional" "parameter" "pause" "pointer" "print" "private"
     "public" "read" "recursive" "result" "rewind" "save" "select"
     "sequence" "target" "write"
     ;; F95 keywords.
     "elemental" "pure") 'words)
  "Keyword-regexp for font-lock level >= 3.")


(defconst f90-procedures-re
  (concat "\\<"
   (regexp-opt
    '("abs" "achar" "acos" "adjustl" "adjustr" "aimag" "aint"
      "all" "allocated" "anint" "any" "asin" "associated"
      "atan" "atan2" "bit_size" "btest" "ceiling" "char" "cmplx"
      "conjg" "cos" "cosh" "count" "cshift" "date_and_time" "dble"
      "digits" "dim" "dot_product" "dprod" "eoshift" "epsilon"
      "exp" "exponent" "floor" "fraction" "huge" "iachar" "iand"
      "ibclr" "ibits" "ibset" "ichar" "ieor" "index" "int" "ior"
      "ishft" "ishftc" "kind" "lbound" "len" "len_trim" "lge" "lgt"
      "lle" "llt" "log" "log10" "logical" "matmul" "max"
      "maxexponent" "maxloc" "maxval" "merge" "min" "minexponent"
      "minloc" "minval" "mod" "modulo" "mvbits" "nearest" "nint"
      "not" "pack" "precision" "present" "product" "radix"
      ;; Real is taken out here to avoid highlighting declarations.
      "random_number" "random_seed" "range" ;; "real"
      "repeat" "reshape" "rrspacing" "scale" "scan"
      "selected_int_kind" "selected_real_kind" "set_exponent"
      "shape" "sign" "sin" "sinh" "size" "spacing" "spread" "sqrt"
      "sum" "system_clock" "tan" "tanh" "tiny" "transfer"
      "transpose" "trim" "ubound" "unpack" "verify"
      ;; F95 intrinsic functions.
      "null" "cpu_time") t)
   ;; A left parenthesis to avoid highlighting non-procedures.
   "[ \t]*(")
  "Regexp whose first part matches F90 intrinsic procedures.")

(defconst f90-operators-re
 (concat "\\."
	 (regexp-opt '("and" "eq" "eqv" "false" "ge" "gt" "le" "lt" "ne"
		       "neqv" "not" "or" "true") t)
	 "\\.")
  "Regexp matching intrinsic operators.")

(defconst f90-hpf-keywords-re
  (regexp-opt
   ;; Intrinsic procedures
   '("all_prefix" "all_scatter" "all_suffix" "any_prefix"
     "any_scatter" "any_suffix" "copy_prefix" "copy_scatter"
     "copy_suffix" "count_prefix" "count_scatter" "count_suffix"
     "grade_down" "grade_up"
     "hpf_alignment" "hpf_distribution" "hpf_template" "iall" "iall_prefix"
     "iall_scatter" "iall_suffix" "iany" "iany_prefix" "iany_scatter"
     "iany_suffix" "ilen" "iparity" "iparity_prefix"
     "iparity_scatter" "iparity_suffix" "leadz" "maxval_prefix"
     "maxval_scatter" "maxval_suffix" "minval_prefix" "minval_scatter"
     "minval_suffix" "number_of_processors" "parity"
     "parity_prefix" "parity_scatter" "parity_suffix" "popcnt" "poppar"
     "processors_shape" "product_prefix" "product_scatter"
     "product_suffix" "sum_prefix" "sum_scatter" "sum_suffix"
     ;; Directives
     "align" "distribute" "dynamic" "independent" "inherit" "processors"
     "realign" "redistribute" "template" 
     ;; Keywords
     "block" "cyclic" "extrinsic" "new" "onto" "pure" "with") 'words)
  "Regexp for all HPF keywords, procedures and directives.")

;; Highlighting patterns

(defvar f90-font-lock-keywords-1
  (list
   ;; Special highlighting of "module procedure foo-list"
   '("\\<\\(module[ \t]*procedure\\)\\>" (1 font-lock-keyword-face))
   ;; Highlight definition of new type
   '("\\<\\(type\\)[ \t]*\\(.*::[ \t]*\\|[ \t]+\\)\\(\\sw+\\)"
     (1 font-lock-keyword-face) (3 font-lock-function-name-face))
   ;; Other functions and declarations.
   '("\\<\\(\\(?:end[ \t]*\\)?\\(program\\|module\\|function\\|subroutine\\|type\\)\\|use\\|call\\)\\>[ \t]*\\(\\sw+\\)?"
     (1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
   "\\<\\(\\(end[ \t]*\\)?\\(interface\\|block[ \t]*data\\)\\|contains\\)\\>")
  "This does fairly subdued highlighting of comments and function calls.")

(defvar f90-font-lock-keywords-2
  (append f90-font-lock-keywords-1
      (list
       ;; Variable declarations (avoid the real function call)
       '("^[ \t0-9]*\\(real\\|integer\\|c\\(haracter\\|omplex\\)\\|logical\\|type[ \t]*(\\sw+)\\)\\(.*::\\|[ \t]*(.*)\\)?\\([^!\n]*\\)"
	 (1 font-lock-type-face) (4 font-lock-variable-name-face))
       ;; do, if, select, where, and forall constructs
       '("\\<\\(end[ \t]*\\(do\\|if\\|select\\|forall\\|where\\)\\)\\>\\([ \t]+\\(\\sw+\\)\\)?"
	 (1 font-lock-keyword-face) (3 font-lock-constant-face nil t))
       '("^[ \t0-9]*\\(\\(\\sw+\\)[ \t]*:[ \t]*\\)?\\(\\(if\\|do\\([ \t]*while\\)?\\|select[ \t]*case\\|where\\|forall\\)\\)\\>"
	 (2 font-lock-constant-face nil t) (3 font-lock-keyword-face))
       ;; implicit declaration
       '("\\<\\(implicit\\)[ \t]*\\(real\\|integer\\|c\\(haracter\\|omplex\\)\\|logical\\|type[ \t]*(\\sw+)\\|none\\)\\>" (1 font-lock-keyword-face) (2 font-lock-type-face))
       '("\\<\\(namelist\\|common\\)[ \t]*\/\\(\\sw+\\)?\/" (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
       "\\<else\\([ \t]*if\\|where\\)?\\>"
       "\\<\\(then\\|continue\\|format\\|include\\|stop\\|return\\)\\>"
       '("\\<\\(exit\\|cycle\\)[ \t]*\\(\\sw+\\)?\\>" 
	 (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
       '("\\<\\(case\\)[ \t]*\\(default\\|(\\)" . 1)
       '("\\<\\(do\\|go *to\\)\\>[ \t]*\\([0-9]+\\)"
	 (1 font-lock-keyword-face) (2 font-lock-constant-face))
       ;; line numbers (lines whose first character after number is letter)
       '("^[ \t]*\\([0-9]+\\)[ \t]*[a-z]+" (1 font-lock-constant-face t))))
  "Highlights declarations, do-loops and other constructions")

(defvar f90-font-lock-keywords-3
  (append f90-font-lock-keywords-2
   (list
    f90-keywords-level-3-re
    f90-operators-re
    (list f90-procedures-re '(1 font-lock-keyword-face keep))
    "\\<real\\>"			; Avoid overwriting real defs.
   ))
  "Highlights all F90 keywords and intrinsic procedures.")

(defvar f90-font-lock-keywords-4
  (append f90-font-lock-keywords-3
    (list f90-hpf-keywords-re))
  "Highlights all F90 and HPF keywords.")

(defvar f90-font-lock-keywords
      f90-font-lock-keywords-2
  "*Default expressions to highlight in F90 mode.")

;; syntax table
(defvar f90-mode-syntax-table nil
  "Syntax table in use in F90 mode buffers.")

(if f90-mode-syntax-table
    ()
  (setq f90-mode-syntax-table (make-syntax-table))
  (modify-syntax-entry ?\! "<" f90-mode-syntax-table)  ; beg. comment
  (modify-syntax-entry ?\n ">" f90-mode-syntax-table)  ; end comment
  (modify-syntax-entry ?_ "w" f90-mode-syntax-table)   ; underscore in names
  (modify-syntax-entry ?\' "\"" f90-mode-syntax-table) ; string quote
  (modify-syntax-entry ?\" "\"" f90-mode-syntax-table) ; string quote
  (modify-syntax-entry ?\` "w" f90-mode-syntax-table)  ; for abbrevs
  (modify-syntax-entry ?\r " " f90-mode-syntax-table)  ; return is whitespace
  (modify-syntax-entry ?+ "." f90-mode-syntax-table)  
  (modify-syntax-entry ?- "." f90-mode-syntax-table)
  (modify-syntax-entry ?= "." f90-mode-syntax-table)
  (modify-syntax-entry ?* "." f90-mode-syntax-table)
  (modify-syntax-entry ?/ "." f90-mode-syntax-table)
  (modify-syntax-entry ?\\ "\\" f90-mode-syntax-table)) ; escape chars

;; keys
(defvar f90-mode-map ()
  "Keymap used in F90 mode.")

(if f90-mode-map
    ()
  (setq f90-mode-map (make-sparse-keymap))
  (define-key f90-mode-map "`"        'f90-abbrev-start)
  (define-key f90-mode-map "\C-c;"    'f90-comment-region)
  (define-key f90-mode-map "\C-\M-a"  'f90-beginning-of-subprogram)
  (define-key f90-mode-map "\C-\M-e"  'f90-end-of-subprogram)
  (define-key f90-mode-map "\C-\M-h"  'f90-mark-subprogram)
  (define-key f90-mode-map "\C-\M-q"  'f90-indent-subprogram)
  (define-key f90-mode-map "\C-j"     'f90-indent-new-line) ; LFD equals C-j
  (define-key f90-mode-map "\r"       'newline)
  (define-key f90-mode-map "\C-c\r"   'f90-break-line)
  ;;  (define-key f90-mode-map [M-return] 'f90-break-line)
  (define-key f90-mode-map "\C-c\C-d" 'f90-join-lines)
  (define-key f90-mode-map "\C-c\C-f" 'f90-fill-region)
  (define-key f90-mode-map "\C-c\C-p" 'f90-previous-statement)
  (define-key f90-mode-map "\C-c\C-n" 'f90-next-statement)
  (define-key f90-mode-map "\C-c\C-w" 'f90-insert-end)
  (define-key f90-mode-map "\t"       'f90-indent-line)
  (define-key f90-mode-map ","        'f90-electric-insert)
  (define-key f90-mode-map "+"        'f90-electric-insert)
  (define-key f90-mode-map "-"        'f90-electric-insert)
  (define-key f90-mode-map "*"        'f90-electric-insert)
  (define-key f90-mode-map "/"        'f90-electric-insert))

 
;; menus
(if (string-match "XEmacs" emacs-version)
    (defvar f90-xemacs-menu
      '("F90"
	["Indent Subprogram"       f90-indent-subprogram t]
	["Mark Subprogram"         f90-mark-subprogram t]
	["Beginning of Subprogram" f90-beginning-of-subprogram t]
	["End of Subprogram"       f90-end-of-subprogram t]
	"-----"
	["(Un)Comment Region"      f90-comment-region t]
	["Indent Region"           indent-region t]
	["Fill Region"             f90-fill-region t]
	"-----"
	["Break Line at Point"     f90-break-line t]
	["Join with Next Line"     f90-join-lines t]
	["Insert Newline"          newline t]
	["Insert Block End"        f90-insert-end t]
	"-----"
	["Upcase Keywords (buffer)"      f90-upcase-keywords t]
	["Upcase Keywords (region)"      f90-upcase-region-keywords
	 t]
	["Capitalize Keywords (buffer)"  f90-capitalize-keywords t]
	["Capitalize Keywords (region)" 
	 f90-capitalize-region-keywords t]
	["Downcase Keywords (buffer)"    f90-downcase-keywords t]
	["Downcase Keywords (region)"   
	 f90-downcase-region-keywords t]
	"-----"
	["Toggle abbrev-mode"   abbrev-mode             t]
	["Toggle auto-fill"     auto-fill-mode		t])
      "XEmacs menu for F90 mode.")
  ;; Emacs

  (defvar f90-change-case-menu
    (let ((map (make-sparse-keymap "Change Keyword Case")))
      
      (define-key map [dkr] (cons "Downcase Keywords (region)"
				  'f90-downcase-region-keywords))
      (put 'f90-downcase-region-keywords 'menu-enable 'mark-active)
      
      (define-key map [ckr] (cons "Capitalize Keywords (region)"
				  'f90-capitalize-region-keywords))
      (put 'f90-capitalize-region-keywords 'menu-enable 'mark-active)
      
      (define-key map [ukr] (cons "Upcase Keywords (region)"
				  'f90-upcase-region-keywords))
      (put 'f90-upcase-region-keywords 'menu-enable 'mark-active)
      
      (define-key map [line] (list "-----------------"))
      
      (define-key map [dkb] (cons "Downcase Keywords (buffer)"
				  'f90-downcase-keywords))
      
      (define-key map [ckb] (cons "Capitalize Keywords (buffer)"
				  'f90-capitalize-keywords))
      
      (define-key map [ukb] (cons "Upcase Keywords (buffer)"
				  'f90-upcase-keywords))
      map)
    "Submenu for change of case.")
  (defalias 'f90-change-case-menu f90-change-case-menu)

  ;; font-lock-menu and function calls
  (defalias 'f90-font-lock-on  'font-lock-mode)
  (defalias 'f90-font-lock-off 'font-lock-mode)
  (put 'f90-font-lock-on  'menu-enable 'font-lock-mode)
  (put 'f90-font-lock-off 'menu-enable '(not font-lock-mode))
  
  (defun f90-font-lock-1 ()
    (interactive)
    "Set font-lock-keywords to f90-font-lock-keywords-1."
    (font-lock-mode 1)
    (setq font-lock-keywords f90-font-lock-keywords-1)
    (font-lock-fontify-buffer))
    
  (defun f90-font-lock-2 ()
    (interactive)
    "Set font-lock-keywords to f90-font-lock-keywords-2."
    (font-lock-mode 1)
    (setq font-lock-keywords f90-font-lock-keywords-2)
    (font-lock-fontify-buffer))
    
  (defun f90-font-lock-3 ()
    (interactive)
    "Set font-lock-keywords to f90-font-lock-keywords-3."
    (font-lock-mode 1)
    (setq font-lock-keywords f90-font-lock-keywords-3)
    (font-lock-fontify-buffer))
    
  (defun f90-font-lock-4 ()
    (interactive)
    "Set font-lock-keywords to f90-font-lock-keywords-4."
    (font-lock-mode 1)
    (setq font-lock-keywords f90-font-lock-keywords-4)
    (font-lock-fontify-buffer))
    
  (defvar f90-font-lock-menu
    (let ((map (make-sparse-keymap "f90-font-lock-menu")))
      (define-key map [h4] (cons "Maximum highlighting (level 4)"
				 'f90-font-lock-4))
      (define-key map [h3] (cons "Heavy highlighting (level 3)"
				 'f90-font-lock-3))
      (define-key map [h2] (cons "Default highlighting (level 2)"
				 'f90-font-lock-2))
      (define-key map [h1] (cons "Light highlighting (level 1)"
				 'f90-font-lock-1))
      (define-key map [line] (list "-----------------"))
      (define-key map [floff] (cons "Turn off font-lock-mode"
				    'f90-font-lock-on))
      (define-key map [flon] (cons "Turn on font-lock-mode"
				   'f90-font-lock-off))
      map)
    "Submenu for highlighting using font-lock-mode.")
  (defalias 'f90-font-lock-menu f90-font-lock-menu)

  (define-key f90-mode-map [menu-bar] (make-sparse-keymap))
  (define-key f90-mode-map [menu-bar f90] 
    (cons "F90" (make-sparse-keymap "f90"))) 

  (define-key f90-mode-map [menu-bar f90 f90-imenu-menu]
    '("Add imenu Menu" . f90-add-imenu-menu))
  (define-key f90-mode-map [menu-bar f90 abbrev-mode]
    '("Toggle abbrev-mode" . abbrev-mode))
  (define-key f90-mode-map [menu-bar f90 auto-fill-mode]
    '("Toggle auto-fill" . auto-fill-mode))
  (define-key f90-mode-map [menu-bar f90 line1]
    '("----"))
  (define-key f90-mode-map [menu-bar f90 f90-change-case-menu]
    (cons "Change Keyword Case" 'f90-change-case-menu))
  (define-key f90-mode-map [menu-bar f90 f90-font-lock-menu]
    (cons "Highlighting" 'f90-font-lock-menu))
  (define-key f90-mode-map [menu-bar f90 line2]
    '("----"))

  (define-key f90-mode-map [menu-bar f90 f90-insert-end]
    '("Insert Block End" . f90-insert-end))
  (define-key f90-mode-map [menu-bar f90 f90-join-lines]
    '("Join with Next Line" . f90-join-lines))
  (define-key f90-mode-map [menu-bar f90 f90-break-line]
    '("Break Line at Point" . f90-break-line))
  
  (define-key f90-mode-map [menu-bar f90 line3]
    '("----"))
  
  (define-key f90-mode-map [menu-bar f90 f90-fill-region]
    '("Fill Region" . f90-fill-region))
  (put 'f90-fill-region 'menu-enable 'mark-active)
  
  (define-key f90-mode-map [menu-bar f90 indent-region]
    '("Indent Region" . indent-region))
  
  (define-key f90-mode-map [menu-bar f90 f90-comment-region]
    '("(Un)Comment Region" . f90-comment-region))
  (put 'f90-comment-region 'menu-enable 'mark-active)
  
  (define-key f90-mode-map [menu-bar f90 line4]
    '("----"))
  
  (define-key f90-mode-map [menu-bar f90 f90-end-of-subprogram]
    '("End of Subprogram" . f90-end-of-subprogram))
  (define-key f90-mode-map [menu-bar f90 f90-beginning-of-subprogram]
    '("Beginning of Subprogram" . f90-beginning-of-subprogram))
  (define-key f90-mode-map [menu-bar f90 f90-mark-subprogram]
    '("Mark Subprogram" . f90-mark-subprogram))
  (define-key f90-mode-map [menu-bar f90 f90-indent-subprogram]
    '("Indent Subprogram" . f90-indent-subprogram))
  )

;; Regexps for finding program structures.
(defconst f90-blocks-re 
  "\\(block[ \t]*data\\|do\\|if\\|interface\\|function\\|module\\|\
program\\|select\\|subroutine\\|type\\|where\\|forall\\)\\>")
(defconst f90-program-block-re 
  "\\(program\\|module\\|subroutine\\|function\\)")
(defconst f90-else-like-re 
  "\\(else\\([ \t]*if\\|where\\)?\\|case[ \t]*\\(default\\|(\\)\\)")
(defconst f90-end-if-re 
  "end[ \t]*\\(if\\|select\\|where\\|forall\\)\\>")
(defconst f90-end-type-re 
  "end[ \t]*\\(type\\|interface\\|block[ \t]*data\\)")
(defconst f90-type-def-re
  "\\<\\(type\\)\\([^(\n]*\\)\\(::\\)?[ \t]*\\b\\(\\sw+\\)")
(defconst f90-no-break-re  "\\(\\*\\*\\|//\\|=>\\)")
;; A temporary position to make region operators faster
(defvar f90-cache-position nil)
(make-variable-buffer-local 'f90-cache-position)
;; A flag to tell whether f90-imenu is turned on.
(defvar f90-imenu nil)
(make-variable-buffer-local 'f90-imenu)


;; Imenu support
(defvar f90-imenu-generic-expression
  (let ((good-char "[^!\"\&\n \t]") (not-e "[^e!\n\"\& \t]")
	(not-n "[^n!\n\"\& \t]") (not-d "[^d!\n\"\& \t]"))
    (list
     '(nil "^[ \t0-9]*program[ \t]+\\(\\sw+\\)" 1)
     '("Modules" "^[ \t0-9]*module[ \t]+\\(\\sw+\\)[ \t]*\\(!\\|$\\)" 1)
     '("Types" "^[ \t0-9]*type[ \t]+\\(\\sw+\\)" 1)
     (list
      "Procedures" 
      (concat
       "^[ \t0-9]*"
       "\\("
       ;; At least three non-space characters before function/subroutine
       ;; Check that the last three non-space characters don't spell E N D
       "[^!\"\&\n]*\\("
       not-e good-char good-char "\\|"
       good-char not-n good-char "\\|"
       good-char good-char not-d "\\)"
       "\\|"
       ;; Less than three non-space characters before function/subroutine
       good-char "?" good-char "?"
       "\\)"
       "[ \t]*\\(function\\|subroutine\\)[ \t]+\\(\\sw+\\)")
    4)))
  "imenu generic expression for F90 mode.")

(defun f90-add-imenu-menu ()
  (interactive)
  "Add an imenu menu to the menubar."
  (if (not f90-imenu)
      (progn
	(imenu-add-to-menubar "F90-imenu")
	(redraw-frame (selected-frame))
	(setq f90-imenu t))
    (message "%s" "F90-imenu already exists.")))
(put 'f90-add-imenu-menu 'menu-enable '(not f90-imenu))


;; When compiling under GNU Emacs, load imenu during compilation.  If
;; you have 19.22 or earlier, comment this out, or get imenu.
(and (fboundp 'eval-when-compile)
     (eval-when-compile
       (if (not (string-match "XEmacs" emacs-version))
	   (require 'imenu))
       ()))

;; abbrevs have generally two letters, except standard types `c, `i, `r, `t
(defvar f90-mode-abbrev-table nil)
(if f90-mode-abbrev-table
    ()
  (let ((ac abbrevs-changed))
    (define-abbrev-table 'f90-mode-abbrev-table ())
    (define-abbrev f90-mode-abbrev-table  "`al"  "allocate" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`ab"  "allocatable" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`as"  "assignment" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`ba"  "backspace" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`bd"  "block data" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`c"   "character" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`cl"  "close" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`cm"  "common" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`cx"  "complex" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`cn"  "contains" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`cy"  "cycle" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`de"  "deallocate" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`df"  "define" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`di"  "dimension" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`dw"  "do while" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`el"  "else" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`eli" "else if" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`elw" "elsewhere" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`eq"  "equivalence" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`ex"  "external" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`ey"  "entry" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`fl"  "forall" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`fo"  "format" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`fu"  "function" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`fa"  ".false." nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`im"  "implicit none" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`in " "include" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`i"   "integer" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`it"  "intent" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`if"  "interface" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`lo"  "logical" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`mo"  "module" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`na"  "namelist" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`nu"  "nullify" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`op"  "optional" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`pa"  "parameter" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`po"  "pointer" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`pr"  "print" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`pi"  "private" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`pm"  "program" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`pu"  "public" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`r"   "real" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`rc"  "recursive" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`rt"  "return" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`rw"  "rewind" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`se"  "select" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`sq"  "sequence" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`su"  "subroutine" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`ta"  "target" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`tr"  ".true." nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`t"   "type" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`wh"  "where" nil 0 t)
    (define-abbrev f90-mode-abbrev-table  "`wr"  "write" nil 0 t)
    (setq abbrevs-changed ac)))

(defcustom f90-mode-hook nil
  "Hook run by F90 mode."
  :type 'hook
  :options '(f90-add-imenu-menu)
  :group 'f90)

;;;###autoload
(defun f90-mode ()
  "Major mode for editing Fortran 90 code in free format.

\\[f90-indent-new-line] corrects current indentation and creates new\
 indented line.
\\[f90-indent-line] indents the current line correctly. 
\\[f90-indent-subprogram] indents the current subprogram. 

Type `? or `\\[help-command] to display a list of built-in\
 abbrevs for F90 keywords.

Key definitions:
\\{f90-mode-map}

Variables controlling indentation style and extra features:

 f90-do-indent
    Extra indentation within do blocks.  (default 3)
 f90-if-indent
    Extra indentation within if/select case/where/forall blocks. (default 3)
 f90-type-indent
    Extra indentation within type/interface/block-data blocks.  (default 3)
 f90-program-indent
    Extra indentation within program/module/subroutine/function blocks.
      (default 2)
 f90-continuation-indent
    Extra indentation applied to continuation lines.  (default 5)
 f90-comment-region
    String inserted by \\[f90-comment-region] at start of each line in 
    region.  (default \"!!!$\")
 f90-indented-comment-re
    Regexp determining the type of comment to be intended like code.
    (default \"!\")
 f90-directive-comment-re
    Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented.
    (default \"!hpf\\\\$\")
 f90-break-delimiters
    Regexp holding list of delimiters at which lines may be broken.
    (default \"[-+*/><=,% \\t]\")
 f90-break-before-delimiters
    Non-nil causes `f90-do-auto-fill' to break lines before delimiters.
    (default t)
 f90-beginning-ampersand 
    Automatic insertion of \& at beginning of continuation lines. (default t)
 f90-smart-end 
    From an END statement, check and fill the end using matching block start.
    Allowed values are 'blink, 'no-blink, and nil, which determine
    whether to blink the matching beginning.) (default 'blink)
 f90-auto-keyword-case
    Automatic change of case of keywords. (default nil)
    The possibilities are 'downcase-word, 'upcase-word, 'capitalize-word.
 f90-leave-line-no
    Do not left-justify line numbers. (default nil)
 f90-startup-message
    Set to nil to inhibit message first time F90 mode is used. (default t)
 f90-keywords-re
    List of keywords used for highlighting/upcase-keywords etc.

Turning on F90 mode calls the value of the variable `f90-mode-hook'
with no args, if that value is non-nil."
  (interactive)
  (kill-all-local-variables)
  (setq major-mode 'f90-mode)
  (setq mode-name "F90")
  (setq local-abbrev-table f90-mode-abbrev-table)
  (set-syntax-table f90-mode-syntax-table)
  (use-local-map f90-mode-map)
  (make-local-variable 'indent-line-function)
  (setq indent-line-function 'f90-indent-line)
  (make-local-variable 'indent-region-function)
  (setq indent-region-function 'f90-indent-region)
  (make-local-variable 'require-final-newline)
  (setq require-final-newline t)
  (make-local-variable 'comment-start)
  (setq comment-start "!")
  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "!+ *")
  (make-local-variable 'comment-indent-function)
  (setq comment-indent-function 'f90-comment-indent)
  (make-local-variable 'abbrev-all-caps)
  (setq abbrev-all-caps t)
  (make-local-variable 'normal-auto-fill-function)
  (setq normal-auto-fill-function 'f90-do-auto-fill)
  (setq indent-tabs-mode nil)
  ;; Setting up things for font-lock
  (if (string-match "XEmacs" emacs-version)
      (progn
	(put 'f90-mode 'font-lock-keywords-case-fold-search t)
	(if (and (featurep 'menubar)
		 current-menubar
		 (not (assoc "F90" current-menubar)))
	    (progn
	      (set-buffer-menubar (copy-sequence current-menubar))
	      (add-submenu nil f90-xemacs-menu)))))
  ;; XEmacs: (Don't need a special case, since both emacsen work alike -sb)
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults 
	'((f90-font-lock-keywords f90-font-lock-keywords-1
				  f90-font-lock-keywords-2
				  f90-font-lock-keywords-3
				  f90-font-lock-keywords-4)
	  nil t))
  ;; Tell imenu how to handle f90.
  (set (make-local-variable 'imenu-case-fold-search) t)
  (make-local-variable 'imenu-generic-expression)
  (setq imenu-generic-expression f90-imenu-generic-expression)
  (set (make-local-variable 'add-log-current-defun-function)
       #'f90-current-defun)
  (run-hooks 'f90-mode-hook)
  (setq f90-startup-message nil))

;; inline-functions
(defsubst f90-get-beg-of-line ()
  (save-excursion (beginning-of-line) (point)))

(defsubst f90-get-end-of-line ()
  (save-excursion (end-of-line) (point)))

(defsubst f90-in-string ()
  (let ((beg-pnt
	 (if (and f90-cache-position (> (point) f90-cache-position))
	     f90-cache-position
	   (point-min))))
    (nth 3 (parse-partial-sexp beg-pnt (point)))))
	    
(defsubst f90-in-comment ()
  (let ((beg-pnt
	 (if (and f90-cache-position (> (point) f90-cache-position))
	     f90-cache-position
	   (point-min))))
    (nth 4 (parse-partial-sexp beg-pnt (point)))))

(defsubst f90-line-continued ()
  (save-excursion
	(beginning-of-line)
	(while (and (looking-at "[ \t]*\\(!\\|$\\)") (zerop (forward-line -1))))
    (let ((bol (f90-get-beg-of-line)))
      (end-of-line)
      (while (f90-in-comment)
	(search-backward "!" bol)
	(skip-chars-backward "!"))
      (skip-chars-backward " \t")
      (= (preceding-char) ?&))))

(defsubst f90-current-indentation ()
  "Return indentation of current line.
Line-numbers are considered whitespace characters."
  (save-excursion
    (beginning-of-line) (skip-chars-forward " \t0-9")
    (current-column)))

(defsubst f90-indent-to (col &optional no-line-number)
  "Indent current line to column COL.
If no-line-number nil, jump over a possible line-number."
  (beginning-of-line)
  (if (not no-line-number)
      (skip-chars-forward " \t0-9"))
  (delete-horizontal-space)
  (if (zerop (current-column))
      (indent-to col)
    (indent-to col 1)))

(defsubst f90-match-piece (arg)
  (if (match-beginning arg)
      (buffer-substring (match-beginning arg) (match-end arg))))

(defsubst f90-get-present-comment-type ()
  (save-excursion
    (let ((type nil) (eol (f90-get-end-of-line)))
      (if (f90-in-comment)
	  (progn
	    (beginning-of-line)
	    (re-search-forward "[!]+" eol)
	    (while (f90-in-string)
	      (re-search-forward "[!]+" eol))
	    (setq type (buffer-substring (match-beginning 0) (match-end 0)))))
      type)))

(defsubst f90-equal-symbols (a b)
  "Compare strings neglecting case and allowing for nil value."
  (let ((a-local (if a (downcase a) nil))
	(b-local (if b (downcase b) nil)))
    (equal a-local b-local)))

;; XEmacs 19.11 & 19.12 gives back a single char when matching an empty regular
;; expression. Therefore, the next 2 functions are longer than necessary.

(defsubst f90-looking-at-do ()
  "Return (\"do\" name) if a do statement starts after point.
Name is nil if the statement has no label."
  (if (looking-at "\\(\\(\\sw+\\)[ \t]*\:\\)?[ \t]*\\(do\\)\\>")
      (let (label
	    (struct (f90-match-piece 3)))
	(if (looking-at "\\(\\sw+\\)[ \t]*\:")
	    (setq label (f90-match-piece 1)))
	(list struct label))))

(defsubst f90-looking-at-select-case ()
  "Return (\"select\" name) if a select-case statement starts after point.
Name is nil if the statement has no label."
  (if (looking-at "\\(\\(\\sw+\\)[ \t]*\:\\)?[ \t]*\\(select\\)[ \t]*case[ \t]*(")
      (let (label
	    (struct (f90-match-piece 3)))
	(if (looking-at "\\(\\sw+\\)[ \t]*\:")
	    (setq label (f90-match-piece 1)))
	(list struct label))))

(defsubst f90-looking-at-if-then ()
  "Return (\"if\" name) if an if () then statement starts after point.
Name is nil if the statement has no label."
  (save-excursion
    (let (struct (label nil))
      (if (looking-at "\\(\\(\\sw+\\)[ \t]*\:\\)?[ \t]*\\(if\\)\\>")
	  (progn
	    (setq struct (f90-match-piece 3))
	    (if (looking-at "\\(\\sw+\\)[ \t]*\:")
		(setq label (f90-match-piece 1)))
	    (let ((pos (scan-lists (point) 1 0)))
	      (and pos (goto-char pos)))
	    (skip-chars-forward " \t")
	    (if (or (looking-at "then\\>")
		    (if (f90-line-continued)
			(progn
			  (f90-next-statement)
			  (skip-chars-forward " \t0-9&")
			  (looking-at "then\\>"))))
		(list struct label)))))))

(defsubst f90-looking-at-where-or-forall ()
  "Return (kind name) if a where or forall block starts after point.
Name is nil if the statement has no label."
  (if (looking-at "\\(\\(\\sw+\\)[ \t]*\:\\)?[ \t]*\\(where\\|forall\\)[ \t]*(.*)[ \t]*\\(!\\|$\\)")
      (let (label
	    (struct (f90-match-piece 3)))
	(if (looking-at "\\(\\sw+\\)[ \t]*\:")
	    (setq label (f90-match-piece 1)))
	(list struct label))))

(defsubst f90-looking-at-type-like ()
  "Return (kind name) at the start of a type/interface/block-data block.
Name is non-nil only for type."
  (cond 
   ((looking-at f90-type-def-re)
    (list (f90-match-piece 1) (f90-match-piece 4)))
   ((looking-at "\\(interface\\|block[\t]*data\\)\\>")
    (list (f90-match-piece 1) nil))))

(defsubst f90-looking-at-program-block-start ()
  "Return (kind name) if a program block with name name starts after point."
  (cond
   ((looking-at "\\(program\\)[ \t]+\\(\\sw+\\)\\>")
    (list (f90-match-piece 1) (f90-match-piece 2)))
   ((and (not (looking-at "module[ \t]*procedure\\>"))
	 (looking-at "\\(module\\)[ \t]+\\(\\sw+\\)\\>"))
    (list (f90-match-piece 1) (f90-match-piece 2)))
   ((and (not (looking-at "end[ \t]*\\(function\\|subroutine\\)"))
	 (looking-at "[^!'\"\&\n]*\\(function\\|subroutine\\)[ \t]+\\(\\sw+\\)"))
    (list (f90-match-piece 1) (f90-match-piece 2)))))

(defsubst f90-looking-at-program-block-end ()
  "Return list of type and name of end of block."
  (if (looking-at (concat "end[ \t]*" f90-blocks-re 
			  "?\\([ \t]+\\(\\sw+\\)\\)?\\>"))
      (list (f90-match-piece 1) (f90-match-piece 3))))

(defsubst f90-comment-indent ()
  (cond ((looking-at "!!!") 0)
	((and f90-directive-comment-re
	      (looking-at f90-directive-comment-re)) 0)
	((looking-at (regexp-quote f90-comment-region)) 0)
	((and (looking-at f90-indented-comment-re)
	      ;; Don't attempt to indent trailing comment as code.
	      (save-excursion
		(skip-chars-backward " \t")
		(bolp)))
	 (f90-calculate-indent))
	(t (skip-chars-backward " \t")
	   (max (if (bolp) 0 (1+ (current-column))) comment-column))))

(defsubst f90-present-statement-cont ()
  "Return continuation properties of present statement."
  (let (pcont cont)
    (save-excursion
      (setq pcont (if (f90-previous-statement) (f90-line-continued) nil)))
    (setq cont (f90-line-continued))
    (cond ((and (not pcont) (not cont)) 'single)
 	  ((and (not pcont) cont)       'begin)
 	  ((and pcont       (not cont)) 'end)
 	  ((and pcont       cont)       'middle)
 	  (t (error)))))

(defsubst f90-indent-line-no ()
  (if f90-leave-line-no
      ()
    (if (and (not (zerop (skip-chars-forward " \t")))
	     (looking-at "[0-9]"))
	(delete-horizontal-space)))
  (skip-chars-forward " \t0-9"))

(defsubst f90-no-block-limit ()
  (let ((eol (f90-get-end-of-line)))
    (save-excursion
      (not (or (looking-at "end")
	       (looking-at "\\(do\\|if\\|else\\(if\\|where\\)?\
\\|select[ \t]*case\\|case\\|where\\|forall\\)\\>")
	       (looking-at "\\(program\\|module\\|interface\\|\
block[ \t]*data\\)\\>")
	       (looking-at "\\(contains\\|\\sw+[ \t]*:\\)")
	       (looking-at f90-type-def-re)
	       (re-search-forward "\\(function\\|subroutine\\)" eol t))))))

(defsubst f90-update-line ()
  (let (bol eol)
    (if f90-auto-keyword-case
	(progn (setq bol (f90-get-beg-of-line)
		     eol (f90-get-end-of-line))
	       (if f90-auto-keyword-case
		   (f90-change-keywords f90-auto-keyword-case bol eol))))))

(defun f90-electric-insert ()
  (interactive)
  "Calls f90-do-auto-fill at each operator insertion."
  (self-insert-command 1)
  (f90-update-line)
  (if auto-fill-function (f90-do-auto-fill)))

(defun f90-get-correct-indent ()
  "Get correct indent for a line starting with line number.
Does not check type and subprogram indentation."
  (let ((epnt (f90-get-end-of-line)) icol cont)
    (save-excursion
      (while (and (f90-previous-statement)
		  (or (progn
			(setq cont (f90-present-statement-cont))
			(or (eq cont 'end) (eq cont 'middle)))
		      (looking-at "[ \t]*[0-9]"))))
      (setq icol (current-indentation))
      (beginning-of-line)
      (if (re-search-forward "\\(if\\|do\\|select\\|where\\|forall\\)"
			     (f90-get-end-of-line) t)
	  (progn
	    (beginning-of-line) (skip-chars-forward " \t")
	    (cond ((f90-looking-at-do)
		   (setq icol (+ icol f90-do-indent)))
		  ((or (f90-looking-at-if-then)
		       (f90-looking-at-where-or-forall)
		       (f90-looking-at-select-case))
		   (setq icol (+ icol f90-if-indent))))
	    (end-of-line)))
      (while (re-search-forward
	      "\\(if\\|do\\|select\\|where\\|forall\\)" epnt t)
	(beginning-of-line) (skip-chars-forward " \t0-9")
	(cond  ((f90-looking-at-do)
		(setq icol (+ icol f90-do-indent)))
	       ((or (f90-looking-at-if-then)
		    (f90-looking-at-where-or-forall)
		    (f90-looking-at-select-case))
		(setq icol (+ icol f90-if-indent)))
	       ((looking-at f90-end-if-re)
		(setq icol (- icol f90-if-indent)))
	       ((looking-at "end[ \t]*do\\>")
		(setq icol (- icol f90-do-indent))))
	(end-of-line))
      icol)))
	       
	  
(defun f90-calculate-indent ()
  "Calculate the indent column based on previous statements."
  (interactive)
  (let (icol cont (case-fold-search t) (pnt (point)))
    (save-excursion
      (if (not (f90-previous-statement))
	  (setq icol 0)
	(setq cont (f90-present-statement-cont))
	(if (eq cont 'end)
	    (while (not (eq 'begin (f90-present-statement-cont)))
	      (f90-previous-statement)))
	(cond ((eq cont 'begin)
	       (setq icol (+ (f90-current-indentation)
			     f90-continuation-indent)))
	      ((eq cont 'middle) (setq icol(current-indentation)))
	      (t (setq icol (f90-current-indentation))
		 (skip-chars-forward " \t")
		 (if (looking-at "[0-9]")
		     (setq icol (f90-get-correct-indent))
		   (cond ((or (f90-looking-at-if-then)
			      (f90-looking-at-where-or-forall)
			      (f90-looking-at-select-case)
			      (looking-at f90-else-like-re))		       
			  (setq icol (+ icol f90-if-indent)))
			 ((f90-looking-at-do)
			  (setq icol (+ icol f90-do-indent)))
			 ((f90-looking-at-type-like)
			  (setq icol (+ icol f90-type-indent)))
			 ((or (f90-looking-at-program-block-start)
			      (looking-at "contains[ \t]*\\($\\|!\\)"))
			  (setq icol (+ icol f90-program-indent)))))
		 (goto-char pnt)
		 (beginning-of-line)
		 (cond ((looking-at "[ \t]*$"))
		       ((looking-at "[ \t]*#") ; Check for cpp directive.
			(setq icol 0))
		       (t
			(skip-chars-forward " \t0-9")
			(cond ((or (looking-at f90-else-like-re)
				   (looking-at f90-end-if-re))
			       (setq icol (- icol f90-if-indent)))
			      ((looking-at "end[ \t]*do\\>")
			       (setq icol (- icol f90-do-indent)))
			      ((looking-at f90-end-type-re)
			       (setq icol (- icol f90-type-indent)))
			      ((or (looking-at "contains[ \t]*\\(!\\|$\\)")
				   (f90-looking-at-program-block-end))
			       (setq icol (- icol f90-program-indent))))))
		 ))))
    icol))

;; Statement = statement line, a line which is neither blank, nor a comment.
(defun f90-previous-statement ()
  "Move point to beginning of the previous F90 statement.
Return nil if no previous statement is found."
  (interactive)
  (let (not-first-statement)
    (beginning-of-line)
    (while (and (setq not-first-statement (zerop (forward-line -1)))
		(looking-at "[ \t0-9]*\\(!\\|$\\|#\\)")))
    not-first-statement))

(defun f90-next-statement ()
  "Move point to beginning of the next F90 statement.
Return nil if no later statement is found."
  (interactive)
  (let (not-last-statement)
    (beginning-of-line)
    (while (and (setq not-last-statement
		      (and (zerop (forward-line 1))
			   (not (eobp))))
 		(looking-at "[ \t0-9]*\\(!\\|$\\)")))
    not-last-statement))

(defun f90-beginning-of-subprogram ()
  "Move point to the beginning of subprogram.
Return (type name) or nil if not found."
  (interactive)
  (let ((count 1) (case-fold-search t) matching-beg)
    (beginning-of-line) (skip-chars-forward " \t0-9")
    (if (setq matching-beg (f90-looking-at-program-block-start)) 
	(setq count (- count 1)))
    (while (and (not (zerop count))
		(re-search-backward f90-program-block-re nil 'move))
      (beginning-of-line) (skip-chars-forward " \t0-9")
      (cond 
       ((setq matching-beg (f90-looking-at-program-block-start))
	(setq count (- count 1)))
       ((f90-looking-at-program-block-end)
	(setq count (+ count 1)))))
    (beginning-of-line)
    (if (zerop count)
	matching-beg
      (message "No beginning-found.")
      nil)))

(defun f90-end-of-subprogram ()
  "Move point to the end of subprogram.
Return (type name) or nil if not found."
  (interactive)
  (let ((count 1) (case-fold-search t) matching-end)
    (beginning-of-line) (skip-chars-forward " \t0-9")
    (if (setq matching-end (f90-looking-at-program-block-end))
	(setq count (1- count)))
    (end-of-line)
    (while (and (not (zerop count))
		(re-search-forward f90-program-block-re nil 'move))
      (beginning-of-line) (skip-chars-forward " \t0-9")
      (cond ((f90-looking-at-program-block-start)
	     (setq count (+ count 1)))
	    ((setq matching-end (f90-looking-at-program-block-end))
	     (setq count (1- count ))))
      (end-of-line))
    (forward-line 1)
    (if (zerop count)
	matching-end
      (message "No end found.")
      nil)))

(defun f90-mark-subprogram ()
  "Put mark at end of F90 subprogram, point at beginning.
Marks are pushed and highlight (grey shadow) is turned on."
  (interactive)
  (let ((pos (point)) program)
    (f90-end-of-subprogram)
    (push-mark (point) t)
    (goto-char pos)
    (setq program (f90-beginning-of-subprogram))
    ;; The keywords in the preceding lists assume case-insensitivity.
    (if (string-match "XEmacs" emacs-version)
	(zmacs-activate-region)
      (setq mark-active t)
      (setq deactivate-mark nil))
    program))

(defun f90-comment-region (beg-region end-region)
  "Comment/uncomment every line in the region.
Insert f90-comment-region at the beginning of every line in the region
or, if already present, remove it."
  (interactive "*r")
  (let ((end (make-marker)))
    (set-marker end end-region)
    (goto-char beg-region)
    (beginning-of-line)
    (if (looking-at (regexp-quote f90-comment-region))
	(delete-region (point) (match-end 0))
      (insert f90-comment-region))
    (while (and  (zerop (forward-line 1))
		 (< (point) (marker-position end)))
      (if (looking-at (regexp-quote f90-comment-region))
	  (delete-region (point) (match-end 0))
	(insert f90-comment-region)))
    (set-marker end nil)))

(defun f90-indent-line (&optional no-update)
  "Indent current line as F90 code."
  (interactive)
  (let (indent (no-line-number nil) (pos (make-marker)) (case-fold-search t))
    (set-marker pos (point))
    (beginning-of-line)			; Digits after & \n are not line-no
    (if (save-excursion (and (f90-previous-statement) (f90-line-continued)))
	(progn (setq no-line-number t) (skip-chars-forward " \t"))
      (f90-indent-line-no))
    (if (looking-at "!")
	(setq indent (f90-comment-indent))
      (if (and (looking-at "end") f90-smart-end)
	    (f90-match-end))
      (setq indent (f90-calculate-indent)))
    (if (zerop (- indent (current-column)))
	nil
      (f90-indent-to indent no-line-number))
    ;; If initial point was within line's indentation,
    ;; position after the indentation.  Else stay at same point in text.
    (if (< (point) (marker-position pos))
	(goto-char (marker-position pos)))
    (if (not no-update) (f90-update-line))
    (if auto-fill-function (f90-do-auto-fill))
    (set-marker pos nil)))

(defun f90-indent-new-line ()
  "Reindent the current F90 line, insert a newline and indent the newline.
An abbrev before point is expanded if `abbrev-mode' is non-nil.
If run in the middle of a line, the line is not broken."
  (interactive)
  (let (string cont (case-fold-search t))
    (if abbrev-mode (expand-abbrev))
    (beginning-of-line)			; Reindent where likely to be needed.
    (f90-indent-line-no)
    (if (or (looking-at "\\(end\\|else\\|!\\)"))
	(f90-indent-line 'no-update))
    (end-of-line)
    (delete-horizontal-space)		;Destroy trailing whitespace
    (setq string (f90-in-string))
    (setq cont (f90-line-continued))
    (if (and string (not cont)) (insert "&"))
    (f90-update-line)
    (newline)
    (if (or string (and cont f90-beginning-ampersand)) (insert "&"))
    (f90-indent-line 'no-update)))


(defun f90-indent-region (beg-region end-region)
  "Indent every line in region by forward parsing."
  (interactive "*r")
  (let ((end-region-mark (make-marker)) (save-point (point-marker))
	(block-list nil) ind-lev ind-curr ind-b cont
	struct beg-struct end-struct)
    (set-marker end-region-mark end-region)
    (goto-char beg-region)
    ;; first find a line which is not a continuation line or comment
    (beginning-of-line)
    (while (and (looking-at "[ \t]*[0-9]*\\(!\\|#\\|[ \t]*$\\)")
		(progn (f90-indent-line 'no-update)
		       (zerop (forward-line 1)))
		(< (point) end-region-mark)))
    (setq cont (f90-present-statement-cont))
    (while (and (or (eq cont 'middle) (eq cont 'end))
		(f90-previous-statement))
      (setq cont (f90-present-statement-cont)))
    ;; process present line for beginning of block
    (setq f90-cache-position (point))
    (f90-indent-line 'no-update)
    (setq ind-lev (f90-current-indentation))
    (setq ind-curr ind-lev)
    (beginning-of-line) (skip-chars-forward " \t0-9")
    (setq struct nil)
    (setq ind-b (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
		      ((or (setq struct (f90-looking-at-if-then))
			   (setq struct (f90-looking-at-select-case))
			   (setq struct (f90-looking-at-where-or-forall))
			   (looking-at f90-else-like-re))
		       f90-if-indent)
		      ((setq struct (f90-looking-at-type-like))
		       f90-type-indent)
		      ((or(setq struct (f90-looking-at-program-block-start))
			  (looking-at "contains[ \t]*\\($\\|!\\)"))
		       f90-program-indent)))
    (if ind-b (setq ind-lev (+ ind-lev ind-b)))
    (if struct (setq block-list (cons struct block-list)))
    (while (and (f90-line-continued) (zerop (forward-line 1))
		(< (point) end-region-mark))
      (if (not (zerop (- (current-indentation) 
			 (+ ind-curr f90-continuation-indent))))
	  (f90-indent-to (+ ind-curr f90-continuation-indent) 'no-line-no)))
    ;; process all following lines
    (while (and  (zerop (forward-line 1)) (< (point) end-region-mark))
      (beginning-of-line)
      (f90-indent-line-no)
      (setq f90-cache-position (point))
      (cond ((looking-at "[ \t]*$") (setq ind-curr 0))
	    ((looking-at "[ \t]*#") (setq ind-curr 0))
	    ((looking-at "!") (setq ind-curr (f90-comment-indent)))
	    ((f90-no-block-limit) (setq ind-curr ind-lev))
	    ((looking-at f90-else-like-re) (setq ind-curr
						 (- ind-lev f90-if-indent)))
	    ((looking-at "contains[ \t]*\\($\\|!\\)")
	     (setq ind-curr (- ind-lev f90-program-indent)))
	    ((setq ind-b
		   (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
			 ((or (setq struct (f90-looking-at-if-then))
			      (setq struct (f90-looking-at-select-case))
			      (setq struct (f90-looking-at-where-or-forall)))
			  f90-if-indent)
			 ((setq struct (f90-looking-at-type-like))
			  f90-type-indent)
			 ((setq struct (f90-looking-at-program-block-start))
			  f90-program-indent)))
	     (setq ind-curr ind-lev)
	     (if ind-b (setq ind-lev (+ ind-lev ind-b)))
	     (setq block-list (cons struct block-list)))
	    ((setq end-struct (f90-looking-at-program-block-end))
	     (setq beg-struct (car block-list)
		   block-list (cdr block-list))
	     (if f90-smart-end 
		 (save-excursion
		   (f90-block-match (car beg-struct)(car (cdr beg-struct))
				    (car end-struct)(car (cdr end-struct)))))
	     (setq ind-b
		   (cond ((looking-at f90-end-if-re) f90-if-indent)
			 ((looking-at "end[ \t]*do\\>")  f90-do-indent)
			 ((looking-at f90-end-type-re) f90-type-indent)
			 ((f90-looking-at-program-block-end)
			  f90-program-indent)))
	     (if ind-b (setq ind-lev (- ind-lev ind-b)))
	     (setq ind-curr ind-lev))
	    (t (setq ind-curr ind-lev)))
      ;; do the indentation if necessary
      (if (not (zerop (- ind-curr (current-column))))
	  (f90-indent-to ind-curr))
      (while (and (f90-line-continued) (zerop (forward-line 1))
		  (< (point) end-region-mark))
	(if (not (zerop (- (current-indentation) 
			   (+ ind-curr f90-continuation-indent))))
	    (f90-indent-to (+ ind-curr f90-continuation-indent) 'no-line-no))))
    ;; restore point etc
    (setq f90-cache-position nil)
    (goto-char save-point)
    (set-marker end-region-mark nil)
    (set-marker save-point nil)
    (if (string-match "XEmacs" emacs-version)
	(zmacs-deactivate-region)
      (deactivate-mark))))

(defun f90-indent-subprogram ()
  "Properly indent the subprogram which contains point."
  (interactive)
  (save-excursion
    (let (program)
      (setq program (f90-mark-subprogram))
      (if program
	  (progn
	    (message "Indenting %s %s..."
		     (car program) (car (cdr program)))
	    (indent-region (point) (mark) nil)
	    (message "Indenting %s %s...done"
		     (car program) (car (cdr program))))
	(message "Indenting the whole file...")
	(indent-region (point) (mark) nil)
	(message "Indenting the whole file...done")))))

;; autofill and break-line
(defun f90-break-line (&optional no-update)
  "Break line at point, insert continuation marker(s) and indent."
  (interactive)
  (let (ctype)
    (cond ((f90-in-string)
	   (insert "&") (newline 1) (insert "&"))
	  ((f90-in-comment)
	   (setq ctype (f90-get-present-comment-type))
	   (newline 1)
	   (insert ctype))
	  (t (insert "&")
	     (if (not no-update) (f90-update-line))
	     (newline 1)
	     (if f90-beginning-ampersand (insert "&")))))
  (indent-according-to-mode))
  
(defun f90-find-breakpoint ()
  "From fill-column, search backward for break-delimiter."
  (let ((bol (f90-get-beg-of-line)))
    (re-search-backward f90-break-delimiters bol)
    (if f90-break-before-delimiters
	(progn (backward-char)
	       (if (not (looking-at f90-no-break-re))
		   (forward-char)))
      (if (looking-at f90-no-break-re)
	  (forward-char 2)
	(forward-char)))))

(defun f90-do-auto-fill ()
  "Break line if non-white characters beyond fill-column. Also, update line. "
  (interactive)
  ;; Break the line before or after the last delimiter (non-word char) if
  ;; position is beyond fill-column.
  ;; Will not break **, //, or => (specified by f90-no-break-re).
  (f90-update-line)
  (while (> (current-column) fill-column)
      (let ((pos-mark (point-marker)))
	(move-to-column fill-column)
	(if (not (f90-in-string))
	    (f90-find-breakpoint))
	(f90-break-line)
	(goto-char pos-mark)
	(set-marker pos-mark nil))))


(defun f90-join-lines ()
  "Join present line with next line, if this line ends with \&."
  (interactive)
  (let (pos (oldpos (point)))
    (end-of-line)
    (skip-chars-backward " \t")
    (cond ((= (preceding-char) ?&)
	   (delete-char -1)
	   (setq pos (point))
	   (forward-line 1)
	   (skip-chars-forward " \t")
	   (if (looking-at "\&") (delete-char 1))
	   (delete-region pos (point))
	   (if (not (f90-in-string))
	       (progn (delete-horizontal-space) (insert " ")))
	   (if (and auto-fill-function
		    (> (save-excursion (end-of-line)
				       (current-column))
		       fill-column))
	       (f90-do-auto-fill))
	   (goto-char oldpos)
	   t))))

(defun f90-fill-region (beg-region end-region)
  "Fill every line in region by forward parsing. Join lines if possible."
  (interactive "*r")
  (let ((end-region-mark (make-marker))
	(f90-smart-end nil) (f90-auto-keyword-case nil) (go-on t)
	(auto-fill-function nil))
    (set-marker end-region-mark end-region)
    (goto-char beg-region)
    (while go-on
      ;; join as much as possible
      (while (f90-join-lines))
      ;; chop the line if necessary
      (while (> (save-excursion (end-of-line) (current-column))
		fill-column)
	(move-to-column fill-column)
	(f90-find-breakpoint)
	(f90-break-line 'no-update))
      (setq go-on (and  (< (point) (marker-position end-region-mark))
			(zerop (forward-line 1))))
      (setq f90-cache-position (point)))
    (setq f90-cache-position nil)
    (if (string-match "XEmacs" emacs-version)
	(zmacs-deactivate-region)
      (deactivate-mark))))

(defun f90-block-match (beg-block beg-name end-block end-name)
  "Match end-struct with beg-struct and complete end-block if possible.
Leave point at the end of line."
  (search-forward "end" (f90-get-end-of-line))
  (catch 'no-match
    (if (not (f90-equal-symbols beg-block end-block))
	(if end-block
	    (progn
	      (message "END %s does not match %s." end-block beg-block)
	      (end-of-line) 
	      (throw 'no-match nil))
	  (message "Inserting %s." beg-block)
	  (insert (concat " " beg-block)))
      (search-forward end-block))
    (if (not (f90-equal-symbols beg-name end-name))
	(cond ((and beg-name (not end-name)) 
	       (message "Inserting %s." beg-name)
	       (insert (concat " " beg-name)))
	      ((and beg-name end-name) 
	       (message "Replacing %s with %s." end-name beg-name)
	       (search-forward end-name)
	       (replace-match beg-name))
	      ((and (not beg-name) end-name) 
	       (message "Deleting %s." end-name)
	       (search-forward end-name)
	       (replace-match "")))
      (if end-name (search-forward end-name)))
    (if (not (looking-at "[ \t]*!")) (delete-horizontal-space))))

(defun f90-match-end ()
  "From an end foo statement, find the corresponding foo including name."
  (interactive)
  (let ((count 1) (top-of-window (window-start)) (matching-beg nil)
	(end-point (point)) (case-fold-search t)
	beg-name end-name beg-block end-block end-struct)
    (if (save-excursion (beginning-of-line) (skip-chars-forward " \t0-9")
			(setq end-struct (f90-looking-at-program-block-end)))
	(progn
	  (setq end-block (car end-struct))
	  (setq end-name  (car (cdr end-struct)))
	  (save-excursion
	    (beginning-of-line)
	    (while 
		(and (not (zerop count))
		     (let ((stop nil) notexist)
		       (while (not stop)
			 (setq notexist
			       (not (re-search-backward 
				     (concat "\\(" f90-blocks-re "\\)") nil t)))
			 (if notexist
			     (setq stop t)
			   (setq stop
				 (not (or (f90-in-string)
					  (f90-in-comment))))))
		       (not notexist)))
	      (beginning-of-line) (skip-chars-forward " \t0-9")
	      (cond ((setq matching-beg
			   (cond
			    ((f90-looking-at-do))
			    ((f90-looking-at-if-then))
			    ((f90-looking-at-where-or-forall))
			    ((f90-looking-at-select-case))
			    ((f90-looking-at-type-like))
			    ((f90-looking-at-program-block-start))))
		     (setq count (- count 1)))
		    ((looking-at (concat "end[ \t]*" f90-blocks-re "\\b"))
		     (setq count (+ count 1)))))
	    (if (not (zerop count))
		(message "No matching beginning.")
	      (f90-update-line)
	      (if (eq f90-smart-end 'blink)
		  (if (< (point) top-of-window)
		      (message "Matches %s: %s"
			       (what-line)
			       (buffer-substring
				(progn (beginning-of-line) (point))
				(progn (end-of-line) (point))))
		    (sit-for 1)))
	      (setq beg-block (car matching-beg))
	      (setq beg-name (car (cdr matching-beg)))
	      (goto-char end-point)
	      (beginning-of-line)
	      (f90-block-match beg-block beg-name end-block end-name)))))))

(defun f90-insert-end ()
  "Inserts an complete end statement matching beginning of present block."
  (interactive)
  (let ((f90-smart-end (if f90-smart-end f90-smart-end 'blink)))
    (insert "end")
    (f90-indent-new-line)))

;; abbrevs and keywords

(defun f90-abbrev-start ()
  "Typing `\\[help-command] or `? lists all the F90 abbrevs. 
Any other key combination is executed normally."
  (interactive)
  (let (e c)
    (insert last-command-char)
    (if (string-match "XEmacs" emacs-version)
	(progn
	  (setq e (next-command-event))
	  (setq c (event-to-character e)))
      (setq c (read-event)))
    ;; insert char if not equal to `?'
    (if (or (eq c ??) (eq c help-char))
	(f90-abbrev-help)
      (if (string-match "XEmacs" emacs-version)
	  (setq unread-command-event e)
	(setq unread-command-events (list c))))))

(defun f90-abbrev-help ()
  "List the currently defined abbrevs in F90 mode."
  (interactive)
  (message "Listing abbrev table...")
  (display-buffer (f90-prepare-abbrev-list-buffer))
  (message "Listing abbrev table...done"))

(defun f90-prepare-abbrev-list-buffer ()
  (save-excursion
    (set-buffer (get-buffer-create "*Abbrevs*"))
    (erase-buffer)
    (insert-abbrev-table-description 'f90-mode-abbrev-table t)
    (goto-char (point-min))
    (set-buffer-modified-p nil)
    (edit-abbrevs-mode))
  (get-buffer-create "*Abbrevs*"))

(defun f90-upcase-keywords ()
  "Upcase all F90 keywords in the buffer."
  (interactive)
  (f90-change-keywords 'upcase-word))

(defun f90-capitalize-keywords ()
  "Capitalize all F90 keywords in the buffer."
  (interactive)
  (f90-change-keywords 'capitalize-word))

(defun f90-downcase-keywords ()
  "Downcase all F90 keywords in the buffer."
  (interactive)
  (f90-change-keywords 'downcase-word))

(defun f90-upcase-region-keywords (beg end)
  "Upcase all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'upcase-word beg end))

(defun f90-capitalize-region-keywords (beg end)
  "Capitalize all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'capitalize-word beg end))

(defun f90-downcase-region-keywords (beg end)
  "Downcase all F90 keywords in the region."
  (interactive "*r")
  (f90-change-keywords 'downcase-word beg end))

;; Change the keywords according to argument.
(defun f90-change-keywords (change-word &optional beg end)
  (save-excursion
    (setq beg (if beg beg (point-min)))
    (setq end (if end end (point-max)))
    (let ((keyword-re 
	   (concat "\\("
		   f90-keywords-re "\\|" f90-procedures-re "\\|"
		   f90-hpf-keywords-re "\\|" f90-operators-re "\\)"))
	  (ref-point (point-min)) state
	  (modified (buffer-modified-p)) saveword back-point)
      (goto-char beg)
      (unwind-protect
	  (while (re-search-forward keyword-re end t)
	    (if (progn
		  (setq state (parse-partial-sexp ref-point (point)))
		  (or (nth 3 state) (nth 4 state)
		      (save-excursion	; Check for cpp directive.
			(beginning-of-line)
			(skip-chars-forward " \t0-9")
			(looking-at "#"))))
		()
	      (setq ref-point (point)
		    back-point (save-excursion (backward-word 1) (point)))
	      (setq saveword (buffer-substring back-point ref-point))
	      (funcall change-word -1)
	      (or (string= saveword (buffer-substring back-point ref-point))
		  (setq modified t))))
	(or modified (set-buffer-modified-p nil))))))


(defun f90-current-defun ()
  "Function to use for `add-log-current-defun-function' in F90 mode."
  (save-excursion
    (nth 1 (f90-beginning-of-subprogram))))

(provide 'f90)

;;; f90.el ends here