lisp/progmodes/f90.el

   1 ;;; f90.el --- Fortran-90 mode (free format)
   2
   3 ;; Copyright (C) 1995, 1996, 1997, 2000, 2004 Free Software Foundation, Inc.
   4
   5 ;; Author: Torbj\"orn Einarsson <Torbjorn.Einarsson@era.ericsson.se>
   6 ;; Maintainer: Glenn Morris <gmorris@ast.cam.ac.uk>
   7 ;; Keywords: fortran, f90, languages
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Major mode for editing F90 programs in FREE FORMAT.
  29 ;; The minor language revision F95 is also supported (with font-locking).
  30
  31 ;; Knows about continuation lines, named structured statements, and other
  32 ;; features in F90 including HPF (High Performance Fortran) structures.
  33 ;; The basic feature provides accurate indentation of F90 programs.
  34 ;; In addition, there are many more features like automatic matching of all
  35 ;; end statements, an auto-fill function to break long lines, a join-lines
  36 ;; function which joins continued lines, etc.
  37
  38 ;; To facilitate typing, a fairly complete list of abbreviations is provided.
  39 ;; All abbreviations begin with the backquote character "`"
  40 ;; (this requires modification of the syntax-table).
  41 ;; For example, `i expands to integer (if abbrev-mode is on).
  42
  43 ;; There are two separate features for altering the appearance of code:
  44 ;;   1) Upcasing or capitalizing of all keywords.
  45 ;;   2) Colors/fonts using font-lock-mode.
  46 ;; Automatic upcase or downcase of keywords is controlled by the variable
  47 ;; f90-auto-keyword-case.
  48
  49 ;; The indentations of lines starting with ! is determined by the first of the
  50 ;; following matches (values in the left column are the defaults):
  51
  52 ;; start-string/regexp  indent         variable holding start-string/regexp
  53 ;;    !!!                  0
  54 ;;    !hpf\\$ (re)         0              f90-directive-comment-re
  55 ;;    !!$                  0              f90-comment-region
  56 ;;    !      (re)        as code          f90-indented-comment-re
  57 ;;    default            comment-column
  58
  59 ;; Ex: Here is the result of 3 different settings of f90-indented-comment-re
  60 ;;     f90-indented-comment-re  !-indentation      !!-indentation
  61 ;;          !                    as code             as code
  62 ;;          !!                   comment-column      as code
  63 ;;          ![^!]                as code             comment-column
  64 ;; Trailing comments are indented to comment-column with indent-for-comment.
  65 ;; The function f90-comment-region toggles insertion of
  66 ;; the variable f90-comment-region in every line of the region.
  67
  68 ;; One common convention for free vs. fixed format is that free format files
  69 ;; have the ending .f90 or .f95 while fixed format files have the ending .f.
  70 ;; Emacs automatically loads Fortran files in the appropriate mode based
  71 ;; on extension. You can modify this by adjusting the variable auto-mode-alist.
  72 ;; For example:
  73 ;; (add-to-list 'auto-mode-alist '("\\.f\\'" . f90-mode))
  74
  75 ;; Once you have entered f90-mode, you may get more info by using
  76 ;; the command describe-mode (C-h m). For online help use
  77 ;; C-h f <Name of function you want described>, or
  78 ;; C-h v <Name of variable you want described>.
  79
  80 ;; To customize f90-mode for your taste, use, for example:
  81 ;; (you don't have to specify values for all the parameters below)
  82 ;;
  83 ;;(add-hook 'f90-mode-hook
  84 ;;      ;; These are the default values.
  85 ;;      '(lambda () (setq f90-do-indent 3
  86 ;;                        f90-if-indent 3
  87 ;;                        f90-type-indent 3
  88 ;;                        f90-program-indent 2
  89 ;;                        f90-continuation-indent 5
  90 ;;                        f90-comment-region "!!$"
  91 ;;                        f90-directive-comment-re "!hpf\\$"
  92 ;;                        f90-indented-comment-re "!"
  93 ;;                        f90-break-delimiters "[-+\\*/><=,% \t]"
  94 ;;                        f90-break-before-delimiters t
  95 ;;                        f90-beginning-ampersand t
  96 ;;                        f90-smart-end 'blink
  97 ;;                        f90-auto-keyword-case nil
  98 ;;                        f90-leave-line-no nil
  99 ;;                        indent-tabs-mode nil
 100 ;;                        f90-font-lock-keywords f90-font-lock-keywords-2
 101 ;;                  )
 102 ;;       ;; These are not default.
 103 ;;       (abbrev-mode 1)             ; turn on abbreviation mode
 104 ;;       (f90-add-imenu-menu)        ; extra menu with functions etc.
 105 ;;       (if f90-auto-keyword-case   ; change case of all keywords on startup
 106 ;;           (f90-change-keywords f90-auto-keyword-case))
 107 ;;       ))
 108 ;;
 109 ;; in your .emacs file. You can also customize the lists
 110 ;; f90-font-lock-keywords, etc.
 111 ;;
 112 ;; The auto-fill and abbreviation minor modes are accessible from the F90 menu,
 113 ;; or by using M-x auto-fill-mode and M-x abbrev-mode, respectively.
 114
 115 ;; Remarks
 116 ;; 1) Line numbers are by default left-justified. If f90-leave-line-no is
 117 ;;    non-nil, the line numbers are never touched.
 118 ;; 2) Multi-; statements like "do i=1,20 ; j=j+i ; end do" are not handled
 119 ;;    correctly, but I imagine them to be rare.
 120 ;; 3) Regexps for hilit19 are no longer supported.
 121 ;; 4) For FIXED FORMAT code, use fortran mode.
 122 ;; 5) This mode does not work under emacs-18.x.
 123 ;; 6) Preprocessor directives, i.e., lines starting with # are left-justified
 124 ;;    and are untouched by all case-changing commands. There is, at present, no
 125 ;;    mechanism for treating multi-line directives (continued by \ ).
 126 ;; 7) f77 do-loops do 10 i=.. ; ; 10 continue are not correctly indented.
 127 ;;    You are urged to use f90-do loops (with labels if you wish).
 128 ;; 8) The highlighting mode under XEmacs is not as complete as under Emacs.
 129
 130 ;; List of user commands
 131 ;;   f90-previous-statement         f90-next-statement
 132 ;;   f90-beginning-of-subprogram    f90-end-of-subprogram   f90-mark-subprogram
 133 ;;   f90-comment-region
 134 ;;   f90-indent-line                f90-indent-new-line
 135 ;;   f90-indent-region    (can be called by calling indent-region)
 136 ;;   f90-indent-subprogram
 137 ;;   f90-break-line                 f90-join-lines
 138 ;;   f90-fill-region
 139 ;;   f90-insert-end
 140 ;;   f90-upcase-keywords            f90-upcase-region-keywords
 141 ;;   f90-downcase-keywords          f90-downcase-region-keywords
 142 ;;   f90-capitalize-keywords        f90-capitalize-region-keywords
 143 ;;   f90-add-imenu-menu
 144 ;;   f90-font-lock-1, f90-font-lock-2, f90-font-lock-3, f90-font-lock-4
 145
 146 ;; Original author's thanks
 147 ;; Thanks to all the people who have tested the mode. Special thanks to Jens
 148 ;; Bloch Helmers for encouraging me to write this code, for creative
 149 ;; suggestions as well as for the lists of hpf-commands.
 150 ;; Also thanks to the authors of the fortran and pascal modes, on which some
 151 ;; of this code is built.
 152
 153 ;;; Code:
 154
 155 ;; TODO
 156 ;; Support for hideshow, align.
 157 ;; OpenMP, preprocessor highlighting.
 158
 159 (defvar comment-auto-fill-only-comments)
 160 (defvar font-lock-keywords)
 161
 162 ;; User options
 163
 164 (defgroup f90 nil
 165   "Major mode for editing free format Fortran 90,95 code."
 166   :group 'languages)
 167
 168 (defgroup f90-indent nil
 169   "Indentation in free format Fortran."
 170   :prefix "f90-"
 171   :group  'f90)
 172
 173
 174 (defcustom f90-do-indent 3
 175   "*Extra indentation applied to DO blocks."
 176   :type  'integer
 177   :group 'f90-indent)
 178
 179 (defcustom f90-if-indent 3
 180   "*Extra indentation applied to IF, SELECT CASE, WHERE and FORALL blocks."
 181   :type  'integer
 182   :group 'f90-indent)
 183
 184 (defcustom f90-type-indent 3
 185   "*Extra indentation applied to TYPE, INTERFACE and BLOCK DATA blocks."
 186   :type  'integer
 187   :group 'f90-indent)
 188
 189 (defcustom f90-program-indent 2
 190   "*Extra indentation applied to PROGRAM, MODULE, SUBROUTINE, FUNCTION blocks."
 191   :type  'integer
 192   :group 'f90-indent)
 193
 194 (defcustom f90-continuation-indent 5
 195   "*Extra indentation applied to continuation lines."
 196   :type  'integer
 197   :group 'f90-indent)
 198
 199 (defcustom f90-comment-region "!!$"
 200   "*String inserted by \\[f90-comment-region] at start of each line in region."
 201   :type  'string
 202   :group 'f90-indent)
 203
 204 (defcustom f90-indented-comment-re "!"
 205   "*Regexp matching comments to indent as code."
 206   :type  'regexp
 207   :group 'f90-indent)
 208
 209 (defcustom f90-directive-comment-re "!hpf\\$"
 210   "*Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented."
 211   :type  'regexp
 212   :group 'f90-indent)
 213
 214 (defcustom f90-beginning-ampersand t
 215   "*Non-nil gives automatic insertion of \& at start of continuation line."
 216   :type  'boolean
 217   :group 'f90)
 218
 219 (defcustom f90-smart-end 'blink
 220   "*From an END statement, check and fill the end using matching block start.
 221 Allowed values are 'blink, 'no-blink, and nil, which determine
 222 whether to blink the matching beginning."
 223   :type  '(choice (const blink) (const no-blink) (const nil))
 224   :group 'f90)
 225
 226 (defcustom f90-break-delimiters "[-+\\*/><=,% \t]"
 227   "*Regexp matching delimiter characters at which lines may be broken.
 228 There are certain tokens comprised entirely of characters
 229 matching this regexp that should not be split, and these are
 230 specified by the constant `f90-no-break-re'."
 231   :type  'regexp
 232   :group 'f90)
 233
 234 (defcustom f90-break-before-delimiters t
 235   "*Non-nil causes `f90-do-auto-fill' to break lines before delimiters."
 236   :type  'boolean
 237   :group 'f90)
 238
 239 (defcustom f90-auto-keyword-case nil
 240   "*Automatic case conversion of keywords.
 241 The options are 'downcase-word, 'upcase-word, 'capitalize-word and nil."
 242   :type  '(choice (const downcase-word) (const upcase-word)
 243                   (const capitalize-word) (const nil))
 244   :group 'f90)
 245
 246 (defcustom f90-leave-line-no nil
 247   "*If non-nil, line numbers are not left justified."
 248   :type  'boolean
 249   :group 'f90)
 250
 251 (defcustom f90-mode-hook nil
 252   "Hook run when entering F90 mode."
 253   :type    'hook
 254   :options '(f90-add-imenu-menu)
 255   :group   'f90)
 256
 257 ;; User options end here.
 258
 259 (defconst f90-keywords-re
 260   (regexp-opt '("allocatable" "allocate" "assign" "assignment" "backspace"
 261                 "block" "call" "case" "character" "close" "common" "complex"
 262                 "contains" "continue" "cycle" "data" "deallocate"
 263                 "dimension" "do" "double" "else" "elseif" "elsewhere" "end"
 264                 "enddo" "endfile" "endif" "entry" "equivalence" "exit"
 265                 "external" "forall" "format" "function" "goto" "if"
 266                 "implicit" "include" "inquire" "integer" "intent"
 267                 "interface" "intrinsic" "logical" "module" "namelist" "none"
 268                 "nullify" "only" "open" "operator" "optional" "parameter"
 269                 "pause" "pointer" "precision" "print" "private" "procedure"
 270                 "program" "public" "read" "real" "recursive" "result" "return"
 271                 "rewind" "save" "select" "sequence" "stop" "subroutine"
 272                 "target" "then" "type" "use" "where" "while" "write"
 273                 ;; F95 keywords.
 274                 "elemental" "pure") 'words)
 275   "Regexp for F90 keywords.")
 276
 277 (defconst f90-keywords-level-3-re
 278   (regexp-opt
 279    '("allocatable" "allocate" "assign" "assignment" "backspace"
 280      "close" "deallocate" "dimension" "endfile" "entry" "equivalence"
 281      "external" "inquire" "intent" "intrinsic" "nullify" "only" "open"
 282      "operator" "optional" "parameter" "pause" "pointer" "print" "private"
 283      "public" "read" "recursive" "result" "rewind" "save" "select"
 284      "sequence" "target" "write"
 285      ;; F95 keywords.
 286      "elemental" "pure") 'words)
 287   "Keyword-regexp for font-lock level >= 3.")
 288
 289 (defconst f90-procedures-re
 290   (concat "\\<"
 291           (regexp-opt
 292            '("abs" "achar" "acos" "adjustl" "adjustr" "aimag" "aint"
 293              "all" "allocated" "anint" "any" "asin" "associated"
 294              "atan" "atan2" "bit_size" "btest" "ceiling" "char" "cmplx"
 295              "conjg" "cos" "cosh" "count" "cshift" "date_and_time" "dble"
 296              "digits" "dim" "dot_product" "dprod" "eoshift" "epsilon"
 297              "exp" "exponent" "floor" "fraction" "huge" "iachar" "iand"
 298              "ibclr" "ibits" "ibset" "ichar" "ieor" "index" "int" "ior"
 299              "ishft" "ishftc" "kind" "lbound" "len" "len_trim" "lge" "lgt"
 300              "lle" "llt" "log" "log10" "logical" "matmul" "max"
 301              "maxexponent" "maxloc" "maxval" "merge" "min" "minexponent"
 302              "minloc" "minval" "mod" "modulo" "mvbits" "nearest" "nint"
 303              "not" "pack" "precision" "present" "product" "radix"
 304              ;; Real is taken out here to avoid highlighting declarations.
 305              "random_number" "random_seed" "range" ;; "real"
 306              "repeat" "reshape" "rrspacing" "scale" "scan"
 307              "selected_int_kind" "selected_real_kind" "set_exponent"
 308              "shape" "sign" "sin" "sinh" "size" "spacing" "spread" "sqrt"
 309              "sum" "system_clock" "tan" "tanh" "tiny" "transfer"
 310              "transpose" "trim" "ubound" "unpack" "verify"
 311              ;; F95 intrinsic functions.
 312              "null" "cpu_time") t)
 313           ;; A left parenthesis to avoid highlighting non-procedures.
 314           "[ \t]*(")
 315   "Regexp whose first part matches F90 intrinsic procedures.")
 316
 317 (defconst f90-operators-re
 318   (concat "\\."
 319           (regexp-opt '("and" "eq" "eqv" "false" "ge" "gt" "le" "lt" "ne"
 320                         "neqv" "not" "or" "true") t)
 321           "\\.")
 322   "Regexp matching intrinsic operators.")
 323
 324 (defconst f90-hpf-keywords-re
 325   (regexp-opt
 326    ;; Intrinsic procedures.
 327    '("all_prefix" "all_scatter" "all_suffix" "any_prefix"
 328      "any_scatter" "any_suffix" "copy_prefix" "copy_scatter"
 329      "copy_suffix" "count_prefix" "count_scatter" "count_suffix"
 330      "grade_down" "grade_up"
 331      "hpf_alignment" "hpf_distribution" "hpf_template" "iall" "iall_prefix"
 332      "iall_scatter" "iall_suffix" "iany" "iany_prefix" "iany_scatter"
 333      "iany_suffix" "ilen" "iparity" "iparity_prefix"
 334      "iparity_scatter" "iparity_suffix" "leadz" "maxval_prefix"
 335      "maxval_scatter" "maxval_suffix" "minval_prefix" "minval_scatter"
 336      "minval_suffix" "number_of_processors" "parity"
 337      "parity_prefix" "parity_scatter" "parity_suffix" "popcnt" "poppar"
 338      "processors_shape" "product_prefix" "product_scatter"
 339      "product_suffix" "sum_prefix" "sum_scatter" "sum_suffix"
 340      ;; Directives.
 341      "align" "distribute" "dynamic" "independent" "inherit" "processors"
 342      "realign" "redistribute" "template"
 343      ;; Keywords.
 344      "block" "cyclic" "extrinsic" "new" "onto" "pure" "with") 'words)
 345   "Regexp for all HPF keywords, procedures and directives.")
 346
 347 ;; Highlighting patterns.
 348
 349 (defvar f90-font-lock-keywords-1
 350   (list
 351    ;; Special highlighting of "module procedure".
 352    '("\\<\\(module[ \t]*procedure\\)\\>" (1 font-lock-keyword-face))
 353    ;; Highlight definition of derived type.
 354    '("\\<\\(\\(?:end[ \t]*\\)?type\\)\\>\\([^()\n]*::\\)?[ \t]*\\(\\sw+\\)"
 355      (1 font-lock-keyword-face) (3 font-lock-function-name-face))
 356    ;; Other functions and declarations.
 357    '("\\<\\(\\(?:end[ \t]*\\)?\\(program\\|module\\|function\\|\
 358 subroutine\\)\\|use\\|call\\)\\>[ \t]*\\(\\sw+\\)?"
 359      (1 font-lock-keyword-face) (3 font-lock-function-name-face nil t))
 360    "\\<\\(\\(end[ \t]*\\)?\\(interface\\|block[ \t]*data\\)\\|contains\\)\\>")
 361   "This does fairly subdued highlighting of comments and function calls.")
 362
 363 (defvar f90-font-lock-keywords-2
 364   (append
 365    f90-font-lock-keywords-1
 366    (list
 367     ;; Variable declarations (avoid the real function call).
 368     '("^[ \t0-9]*\\(real\\|integer\\|c\\(haracter\\|omplex\\)\\|\
 369 logical\\|type[ \t]*(\\sw+)\\)\\(.*::\\|[ \t]*(.*)\\)?\\([^&!\n]*\\)"
 370       (1 font-lock-type-face t) (4 font-lock-variable-name-face t))
 371     ;; do, if, select, where, and forall constructs.
 372     '("\\<\\(end[ \t]*\\(do\\|if\\|select\\|forall\\|where\\)\\)\\>\
 373 \\([ \t]+\\(\\sw+\\)\\)?"
 374       (1 font-lock-keyword-face) (3 font-lock-constant-face nil t))
 375     '("^[ \t0-9]*\\(\\(\\sw+\\)[ \t]*:[ \t]*\\)?\\(\\(if\\|\
 376 do\\([ \t]*while\\)?\\|select[ \t]*case\\|where\\|forall\\)\\)\\>"
 377       (2 font-lock-constant-face nil t) (3 font-lock-keyword-face))
 378     ;; Implicit declaration.
 379     '("\\<\\(implicit\\)[ \t]*\\(real\\|integer\\|c\\(haracter\\|omplex\\)\
 380 \\|logical\\|type[ \t]*(\\sw+)\\|none\\)[ \t]*"
 381       (1 font-lock-keyword-face) (2 font-lock-type-face))
 382     '("\\<\\(namelist\\|common\\)[ \t]*\/\\(\\sw+\\)?\/"
 383       (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
 384     "\\<else\\([ \t]*if\\|where\\)?\\>"
 385     '("\\(&\\)[ \t]*\\(!\\|$\\)"  (1 font-lock-keyword-face))
 386     "\\<\\(then\\|continue\\|format\\|include\\|stop\\|return\\)\\>"
 387     '("\\<\\(exit\\|cycle\\)[ \t]*\\(\\sw+\\)?\\>"
 388       (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
 389     '("\\<\\(case\\)[ \t]*\\(default\\|(\\)" . 1)
 390     '("\\<\\(do\\|go *to\\)\\>[ \t]*\\([0-9]+\\)"
 391       (1 font-lock-keyword-face) (2 font-lock-constant-face))
 392     ;; Line numbers (lines whose first character after number is letter).
 393     '("^[ \t]*\\([0-9]+\\)[ \t]*[a-z]+" (1 font-lock-constant-face t))))
 394   "Highlights declarations, do-loops and other constructs.")
 395
 396 (defvar f90-font-lock-keywords-3
 397   (append f90-font-lock-keywords-2
 398           (list
 399            f90-keywords-level-3-re
 400            f90-operators-re
 401            (list f90-procedures-re '(1 font-lock-keyword-face keep))
 402            "\\<real\\>"                 ; avoid overwriting real defs
 403            ))
 404   "Highlights all F90 keywords and intrinsic procedures.")
 405
 406 (defvar f90-font-lock-keywords-4
 407   (append f90-font-lock-keywords-3
 408           (list f90-hpf-keywords-re))
 409   "Highlights all F90 and HPF keywords.")
 410
 411 (defvar f90-font-lock-keywords
 412   f90-font-lock-keywords-2
 413   "*Default expressions to highlight in F90 mode.
 414 Can be overridden by the value of `font-lock-maximum-decoration'.")
 415
 416
 417 (defvar f90-mode-syntax-table
 418   (let ((table (make-syntax-table)))
 419     (modify-syntax-entry ?\! "<"  table) ; begin comment
 420     (modify-syntax-entry ?\n ">"  table) ; end comment
 421     (modify-syntax-entry ?_  "w"  table) ; underscore in names
 422     (modify-syntax-entry ?\' "\"" table) ; string quote
 423     (modify-syntax-entry ?\" "\"" table) ; string quote
 424     (modify-syntax-entry ?\` "w"  table) ; for abbrevs
 425     (modify-syntax-entry ?\r " "  table) ; return is whitespace
 426     (modify-syntax-entry ?+  "."  table) ; punctuation
 427     (modify-syntax-entry ?-  "."  table)
 428     (modify-syntax-entry ?=  "."  table)
 429     (modify-syntax-entry ?*  "."  table)
 430     (modify-syntax-entry ?/  "."  table)
 431     (modify-syntax-entry ?\\ "\\" table) ; escape chars
 432     table)
 433   "Syntax table used in F90 mode.")
 434
 435 (defvar f90-mode-map
 436   (let ((map (make-sparse-keymap)))
 437     (define-key map "`"        'f90-abbrev-start)
 438     (define-key map "\C-c;"    'f90-comment-region)
 439     (define-key map "\C-\M-a"  'f90-beginning-of-subprogram)
 440     (define-key map "\C-\M-e"  'f90-end-of-subprogram)
 441     (define-key map "\C-\M-h"  'f90-mark-subprogram)
 442     (define-key map "\C-\M-n"  'f90-end-of-block)
 443     (define-key map "\C-\M-p"  'f90-beginning-of-block)
 444     (define-key map "\C-\M-q"  'f90-indent-subprogram)
 445     (define-key map "\C-j"     'f90-indent-new-line) ; LFD equals C-j
 446     (define-key map "\r"       'newline)
 447     (define-key map "\C-c\r"   'f90-break-line)
 448 ;;;  (define-key map [M-return] 'f90-break-line)
 449     (define-key map "\C-c\C-a" 'f90-previous-block)
 450     (define-key map "\C-c\C-e" 'f90-next-block)
 451     (define-key map "\C-c\C-d" 'f90-join-lines)
 452     (define-key map "\C-c\C-f" 'f90-fill-region)
 453     (define-key map "\C-c\C-p" 'f90-previous-statement)
 454     (define-key map "\C-c\C-n" 'f90-next-statement)
 455     (define-key map "\C-c\C-w" 'f90-insert-end)
 456     (define-key map "\t"       'f90-indent-line)
 457     (define-key map ","        'f90-electric-insert)
 458     (define-key map "+"        'f90-electric-insert)
 459     (define-key map "-"        'f90-electric-insert)
 460     (define-key map "*"        'f90-electric-insert)
 461     (define-key map "/"        'f90-electric-insert)
 462
 463     (easy-menu-define f90-menu map "Menu for F90 mode."
 464       `("F90"
 465         ("Customization"
 466          ,(custom-menu-create 'f90)
 467          ["Set"  Custom-set t]
 468          ["Save" Custom-save t]
 469          ["Reset to Current" Custom-reset-current t]
 470          ["Reset to Saved"   Custom-reset-saved t]
 471          ["Reset to Standard Settings" Custom-reset-standard t]
 472          )
 473         "--"
 474         ["Indent Subprogram"       f90-indent-subprogram       t]
 475         ["Mark Subprogram"         f90-mark-subprogram         t]
 476         ["Beginning of Subprogram" f90-beginning-of-subprogram t]
 477         ["End of Subprogram"       f90-end-of-subprogram       t]
 478         "--"
 479         ["(Un)Comment Region" f90-comment-region mark-active]
 480         ["Indent Region"      f90-indent-region  mark-active]
 481         ["Fill Region"        f90-fill-region    mark-active]
 482         "--"
 483         ["Break Line at Point"     f90-break-line t]
 484         ["Join with Previous Line" f90-join-lines t]
 485         ["Insert Block End"        f90-insert-end t]
 486         "--"
 487         ("Highlighting"
 488          ["Toggle font-lock-mode" font-lock-mode :selected font-lock-mode
 489           :style toggle]
 490          "--"
 491          ["Light highlighting (level 1)"    f90-font-lock-1 t]
 492          ["Moderate highlighting (level 2)" f90-font-lock-2 t]
 493          ["Heavy highlighting (level 3)"    f90-font-lock-3 t]
 494          ["Maximum highlighting (level 4)"  f90-font-lock-4 t]
 495          )
 496         ("Change Keyword Case"
 497          ["Upcase Keywords (buffer)"     f90-upcase-keywords     t]
 498          ["Capitalize Keywords (buffer)" f90-capitalize-keywords t]
 499          ["Downcase Keywords (buffer)"   f90-downcase-keywords   t]
 500          "--"
 501          ["Upcase Keywords (region)"     f90-upcase-region-keywords
 502           mark-active]
 503          ["Capitalize Keywords (region)" f90-capitalize-region-keywords
 504           mark-active]
 505          ["Downcase Keywords (region)"   f90-downcase-region-keywords
 506           mark-active]
 507          )
 508         "--"
 509         ["Toggle auto-fill"   auto-fill-mode :selected auto-fill-function
 510          :style toggle]
 511         ["Toggle abbrev-mode" abbrev-mode    :selected abbrev-mode
 512          :style toggle]
 513         ["Add imenu Menu" f90-add-imenu-menu
 514          :active   (not (lookup-key (current-local-map) [menu-bar index]))
 515          :included (fboundp 'imenu-add-to-menubar)]))
 516     map)
 517   "Keymap used in F90 mode.")
 518
 519
 520 (defun f90-font-lock-1 ()
 521   "Set `font-lock-keywords' to `f90-font-lock-keywords-1'."
 522   (interactive)
 523   (font-lock-mode 1)
 524   (setq font-lock-keywords f90-font-lock-keywords-1)
 525   (font-lock-fontify-buffer))
 526
 527 (defun f90-font-lock-2 ()
 528   "Set `font-lock-keywords' to `f90-font-lock-keywords-2'."
 529   (interactive)
 530   (font-lock-mode 1)
 531   (setq font-lock-keywords f90-font-lock-keywords-2)
 532   (font-lock-fontify-buffer))
 533
 534 (defun f90-font-lock-3 ()
 535   "Set `font-lock-keywords' to `f90-font-lock-keywords-3'."
 536   (interactive)
 537   (font-lock-mode 1)
 538   (setq font-lock-keywords f90-font-lock-keywords-3)
 539   (font-lock-fontify-buffer))
 540
 541 (defun f90-font-lock-4 ()
 542   "Set `font-lock-keywords' to `f90-font-lock-keywords-4'."
 543   (interactive)
 544   (font-lock-mode 1)
 545   (setq font-lock-keywords f90-font-lock-keywords-4)
 546   (font-lock-fontify-buffer))
 547
 548 \f
 549 ;; Regexps for finding program structures.
 550 (defconst f90-blocks-re
 551   (concat "\\(block[ \t]*data\\|"
 552           (regexp-opt '("do" "if" "interface" "function" "module" "program"
 553                         "select" "subroutine" "type" "where" "forall"))
 554           "\\)\\>")
 555   "Regexp potentially indicating a \"block\" of F90 code.")
 556
 557 (defconst f90-program-block-re
 558   (regexp-opt '("program" "module" "subroutine" "function") 'paren)
 559   "Regexp used to locate the start/end of a \"subprogram\".")
 560
 561 (defconst f90-else-like-re
 562   "\\(else\\([ \t]*if\\|where\\)?\\|case[ \t]*\\(default\\|(\\)\\)"
 563   "Regexp matching an ELSE IF, ELSEWHERE, CASE statement.")
 564
 565 (defconst f90-end-if-re
 566   (concat "end[ \t]*"
 567           (regexp-opt '("if" "select" "where" "forall") 'paren)
 568           "\\>")
 569   "Regexp matching the end of an IF, SELECT, WHERE, FORALL block.")
 570
 571 (defconst f90-end-type-re
 572   "end[ \t]*\\(type\\|interface\\|block[ \t]*data\\)\\>"
 573   "Regexp matching the end of a TYPE, INTERFACE, BLOCK DATA section.")
 574
 575 (defconst f90-type-def-re
 576   "\\<\\(type\\)\\>\\(?:[^()\n]*::\\)?[ \t]*\\(\\sw+\\)"
 577   "Regexp matching the definition of a derived type.")
 578
 579 (defconst f90-no-break-re
 580   (regexp-opt '("**" "//" "=>" ">=" "<=" "==" "/=") 'paren)
 581   "Regexp specifying where not to break lines when filling.
 582 This regexp matches certain tokens comprised entirely of
 583 characters matching the regexp `f90-break-delimiters' that should
 584 not be split by filling.  Each element is assumed to be two
 585 characters long.")
 586
 587 (defvar f90-cache-position nil
 588   "Temporary position used to speed up region operations.")
 589 (make-variable-buffer-local 'f90-cache-position)
 590
 591 \f
 592 ;; Imenu support.
 593 (defvar f90-imenu-generic-expression
 594   (let ((good-char "[^!\"\&\n \t]") (not-e "[^e!\n\"\& \t]")
 595         (not-n "[^n!\n\"\& \t]") (not-d "[^d!\n\"\& \t]"))
 596     (list
 597      '(nil "^[ \t0-9]*program[ \t]+\\(\\sw+\\)" 1)
 598      '("Modules" "^[ \t0-9]*module[ \t]+\\(\\sw+\\)[ \t]*\\(!\\|$\\)" 1)
 599      '("Types" "^[ \t0-9]*type[ \t]+\\(\\sw+\\)" 1)
 600      (list
 601       "Procedures"
 602       (concat
 603        "^[ \t0-9]*"
 604        "\\("
 605        ;; At least three non-space characters before function/subroutine.
 606        ;; Check that the last three non-space characters do not spell E N D.
 607        "[^!\"\&\n]*\\("
 608        not-e good-char good-char "\\|"
 609        good-char not-n good-char "\\|"
 610        good-char good-char not-d "\\)"
 611        "\\|"
 612        ;; Less than three non-space characters before function/subroutine.
 613        good-char "?" good-char "?"
 614        "\\)"
 615        "[ \t]*\\(function\\|subroutine\\)[ \t]+\\(\\sw+\\)")
 616       4)))
 617   "Value for `imenu-generic-expression' in F90 mode.")
 618
 619 (defun f90-add-imenu-menu ()
 620   "Add an imenu menu to the menubar."
 621   (interactive)
 622   (if (lookup-key (current-local-map) [menu-bar index])
 623       (message "%s" "F90-imenu already exists.")
 624     (imenu-add-to-menubar "F90-imenu")
 625     (redraw-frame (selected-frame))))
 626
 627 \f
 628 ;; Abbrevs have generally two letters, except standard types `c, `i, `r, `t.
 629 (defvar f90-mode-abbrev-table
 630   (let (abbrevs-changed)
 631     (define-abbrev-table 'f90-mode-abbrev-table nil)
 632     ;; Use the 6th arg (SYSTEM-FLAG) of define-abbrev if possible.
 633     ;; A little baroque to quieten the byte-compiler.
 634     (mapcar
 635      (function (lambda (element)
 636                  (condition-case nil
 637                      (apply 'define-abbrev f90-mode-abbrev-table
 638                             (append element '(nil 0 t)))
 639                    (wrong-number-of-arguments
 640                     (apply 'define-abbrev f90-mode-abbrev-table
 641                            (append element '(nil 0)))))))
 642      '(("`al"  "allocate"     )
 643        ("`ab"  "allocatable"  )
 644        ("`as"  "assignment"   )
 645        ("`ba"  "backspace"    )
 646        ("`bd"  "block data"   )
 647        ("`c"   "character"    )
 648        ("`cl"  "close"        )
 649        ("`cm"  "common"       )
 650        ("`cx"  "complex"      )
 651        ("`cn"  "contains"     )
 652        ("`cy"  "cycle"        )
 653        ("`de"  "deallocate"   )
 654        ("`df"  "define"       )
 655        ("`di"  "dimension"    )
 656        ("`dw"  "do while"     )
 657        ("`el"  "else"         )
 658        ("`eli" "else if"      )
 659        ("`elw" "elsewhere"    )
 660        ("`eq"  "equivalence"  )
 661        ("`ex"  "external"     )
 662        ("`ey"  "entry"        )
 663        ("`fl"  "forall"       )
 664        ("`fo"  "format"       )
 665        ("`fu"  "function"     )
 666        ("`fa"  ".false."      )
 667        ("`im"  "implicit none")
 668        ("`in"  "include"      )
 669        ("`i"   "integer"      )
 670        ("`it"  "intent"       )
 671        ("`if"  "interface"    )
 672        ("`lo"  "logical"      )
 673        ("`mo"  "module"       )
 674        ("`na"  "namelist"     )
 675        ("`nu"  "nullify"      )
 676        ("`op"  "optional"     )
 677        ("`pa"  "parameter"    )
 678        ("`po"  "pointer"      )
 679        ("`pr"  "print"        )
 680        ("`pi"  "private"      )
 681        ("`pm"  "program"      )
 682        ("`pu"  "public"       )
 683        ("`r"   "real"         )
 684        ("`rc"  "recursive"    )
 685        ("`rt"  "return"       )
 686        ("`rw"  "rewind"       )
 687        ("`se"  "select"       )
 688        ("`sq"  "sequence"     )
 689        ("`su"  "subroutine"   )
 690        ("`ta"  "target"       )
 691        ("`tr"  ".true."       )
 692        ("`t"   "type"         )
 693        ("`wh"  "where"        )
 694        ("`wr"  "write"        )))
 695     f90-mode-abbrev-table)
 696   "Abbrev table for F90 mode.")
 697 \f
 698
 699 ;;;###autoload
 700 (defun f90-mode ()
 701   "Major mode for editing Fortran 90,95 code in free format.
 702 For fixed format code, use `fortran-mode'.
 703
 704 \\[f90-indent-line] indents the current line.
 705 \\[f90-indent-new-line] indents current line and creates a new\
 706  indented line.
 707 \\[f90-indent-subprogram] indents the current subprogram.
 708
 709 Type `? or `\\[help-command] to display a list of built-in\
 710  abbrevs for F90 keywords.
 711
 712 Key definitions:
 713 \\{f90-mode-map}
 714
 715 Variables controlling indentation style and extra features:
 716
 717 `f90-do-indent'
 718   Extra indentation within do blocks (default 3).
 719 `f90-if-indent'
 720   Extra indentation within if/select case/where/forall blocks (default 3).
 721 `f90-type-indent'
 722   Extra indentation within type/interface/block-data blocks (default 3).
 723 `f90-program-indent'
 724   Extra indentation within program/module/subroutine/function blocks
 725   (default 2).
 726 `f90-continuation-indent'
 727   Extra indentation applied to continuation lines (default 5).
 728 `f90-comment-region'
 729   String inserted by function \\[f90-comment-region] at start of each
 730   line in region (default \"!!!$\").
 731 `f90-indented-comment-re'
 732   Regexp determining the type of comment to be intended like code
 733   (default \"!\").
 734 `f90-directive-comment-re'
 735   Regexp of comment-like directive like \"!HPF\\\\$\", not to be indented
 736   (default \"!hpf\\\\$\").
 737 `f90-break-delimiters'
 738   Regexp holding list of delimiters at which lines may be broken
 739   (default \"[-+*/><=,% \\t]\").
 740 `f90-break-before-delimiters'
 741   Non-nil causes `f90-do-auto-fill' to break lines before delimiters
 742   (default t).
 743 `f90-beginning-ampersand'
 744   Automatic insertion of \& at beginning of continuation lines (default t).
 745 `f90-smart-end'
 746   From an END statement, check and fill the end using matching block start.
 747   Allowed values are 'blink, 'no-blink, and nil, which determine
 748   whether to blink the matching beginning (default 'blink).
 749 `f90-auto-keyword-case'
 750   Automatic change of case of keywords (default nil).
 751   The possibilities are 'downcase-word, 'upcase-word, 'capitalize-word.
 752 `f90-leave-line-no'
 753   Do not left-justify line numbers (default nil).
 754 `f90-keywords-re'
 755   List of keywords used for highlighting/upcase-keywords etc.
 756
 757 Turning on F90 mode calls the value of the variable `f90-mode-hook'
 758 with no args, if that value is non-nil."
 759   (interactive)
 760   (kill-all-local-variables)
 761   (setq major-mode 'f90-mode
 762         mode-name "F90"
 763         local-abbrev-table f90-mode-abbrev-table)
 764   (set-syntax-table f90-mode-syntax-table)
 765   (use-local-map f90-mode-map)
 766   (set (make-local-variable 'indent-line-function) 'f90-indent-line)
 767   (set (make-local-variable 'indent-region-function) 'f90-indent-region)
 768   (set (make-local-variable 'require-final-newline) t)
 769   (set (make-local-variable 'comment-start) "!")
 770   (set (make-local-variable 'comment-start-skip) "!+ *")
 771   (set (make-local-variable 'comment-indent-function) 'f90-comment-indent)
 772   (set (make-local-variable 'abbrev-all-caps) t)
 773   (set (make-local-variable 'normal-auto-fill-function) 'f90-do-auto-fill)
 774   (setq indent-tabs-mode nil)           ; auto buffer local
 775   (set (make-local-variable 'font-lock-defaults)
 776        '((f90-font-lock-keywords f90-font-lock-keywords-1
 777                                  f90-font-lock-keywords-2
 778                                  f90-font-lock-keywords-3
 779                                  f90-font-lock-keywords-4)
 780          nil t))
 781   (set (make-local-variable 'imenu-case-fold-search) t)
 782   (set (make-local-variable 'imenu-generic-expression)
 783        f90-imenu-generic-expression)
 784   (set (make-local-variable 'beginning-of-defun-function)
 785        'f90-beginning-of-subprogram)
 786   (set (make-local-variable 'end-of-defun-function) 'f90-end-of-subprogram)
 787   (set (make-local-variable 'add-log-current-defun-function)
 788        #'f90-current-defun)
 789   (run-hooks 'f90-mode-hook))
 790
 791 \f
 792 ;; Inline-functions.
 793 (defsubst f90-in-string ()
 794   "Return non-nil if point is inside a string.
 795 Checks from `point-min', or `f90-cache-position', if that is non-nil
 796 and lies before point."
 797   (let ((beg-pnt
 798          (if (and f90-cache-position (> (point) f90-cache-position))
 799              f90-cache-position
 800            (point-min))))
 801     (nth 3 (parse-partial-sexp beg-pnt (point)))))
 802
 803 (defsubst f90-in-comment ()
 804   "Return non-nil if point is inside a comment.
 805 Checks from `point-min', or `f90-cache-position', if that is non-nil
 806 and lies before point."
 807   (let ((beg-pnt
 808          (if (and f90-cache-position (> (point) f90-cache-position))
 809              f90-cache-position
 810            (point-min))))
 811     (nth 4 (parse-partial-sexp beg-pnt (point)))))
 812
 813 (defsubst f90-line-continued ()
 814   "Return t if the current line is a continued one.
 815 This includes comment lines embedded in continued lines, but
 816 not the last line of a continued statement."
 817   (save-excursion
 818     (beginning-of-line)
 819     (while (and (looking-at "[ \t]*\\(!\\|$\\)") (zerop (forward-line -1))))
 820     (end-of-line)
 821     (while (f90-in-comment)
 822       (search-backward "!" (line-beginning-position))
 823       (skip-chars-backward "!"))
 824     (skip-chars-backward " \t")
 825     (= (preceding-char) ?&)))
 826
 827 ;; GM this is not right, eg a continuation line starting with a number.
 828 ;; Need f90-code-start-position function.
 829 ;; And yet, things seems to work with this...
 830 ;; cf f90-indent-line
 831 ;;     (beginning-of-line)           ; digits after & \n are not line-nos
 832 ;;     (if (not (save-excursion (and (f90-previous-statement)
 833 ;;                                   (f90-line-continued))))
 834 ;;         (f90-indent-line-no)
 835 (defsubst f90-current-indentation ()
 836   "Return indentation of current line.
 837 Line-numbers are considered whitespace characters."
 838   (save-excursion (beginning-of-line) (skip-chars-forward " \t0-9")))
 839
 840 (defsubst f90-indent-to (col &optional no-line-number)
 841   "Indent current line to column COL.
 842 If optional argument NO-LINE-NUMBER is nil, jump over a possible
 843 line-number before indenting."
 844   (beginning-of-line)
 845   (or no-line-number
 846       (skip-chars-forward " \t0-9"))
 847   (delete-horizontal-space)
 848   ;; Leave >= 1 space after line number.
 849   (indent-to col (if (zerop (current-column)) 0 1)))
 850
 851 (defsubst f90-get-present-comment-type ()
 852   "If point lies within a comment, return the string starting the comment.
 853 For example, \"!\" or \"!!\"."
 854   (save-excursion
 855     (when (f90-in-comment)
 856       (beginning-of-line)
 857       (re-search-forward "!+" (line-end-position))
 858       (while (f90-in-string)
 859         (re-search-forward "!+" (line-end-position)))
 860       (match-string 0))))
 861
 862 (defsubst f90-equal-symbols (a b)
 863   "Compare strings A and B neglecting case and allowing for nil value."
 864   (equal (if a (downcase a) nil)
 865          (if b (downcase b) nil)))
 866
 867 (defsubst f90-looking-at-do ()
 868   "Return (\"do\" NAME) if a do statement starts after point.
 869 NAME is nil if the statement has no label."
 870   (if (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\\(do\\)\\>")
 871       (list (match-string 3) (match-string 2))))
 872
 873 (defsubst f90-looking-at-select-case ()
 874   "Return (\"select\" NAME) if a select-case statement starts after point.
 875 NAME is nil if the statement has no label."
 876   (if (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\
 877 \\(select\\)[ \t]*case[ \t]*(")
 878       (list (match-string 3) (match-string 2))))
 879
 880 (defsubst f90-looking-at-if-then ()
 881   "Return (\"if\" NAME) if an if () then statement starts after point.
 882 NAME is nil if the statement has no label."
 883   (save-excursion
 884     (when (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\\(if\\)\\>")
 885       (let ((struct (match-string 3))
 886             (label (match-string 2))
 887             (pos (scan-lists (point) 1 0)))
 888         (and pos (goto-char pos))
 889         (skip-chars-forward " \t")
 890         (if (or (looking-at "then\\>")
 891                 (when (f90-line-continued)
 892                   (f90-next-statement)
 893                   (skip-chars-forward " \t0-9&")
 894                   (looking-at "then\\>")))
 895             (list struct label))))))
 896
 897 (defsubst f90-looking-at-where-or-forall ()
 898   "Return (KIND NAME) if a where or forall block starts after point.
 899 NAME is nil if the statement has no label."
 900   (save-excursion
 901     (when (looking-at "\\(\\(\\sw+\\)[ \t]*:\\)?[ \t]*\
 902 \\(where\\|forall\\)\\>")
 903       (let ((struct (match-string 3))
 904             (label (match-string 2))
 905             (pos (scan-lists (point) 1 0)))
 906         (and pos (goto-char pos))
 907         (skip-chars-forward " \t")
 908         (if (looking-at "\\(!\\|$\\)") (list struct label))))))
 909
 910 (defsubst f90-looking-at-type-like ()
 911   "Return (KIND NAME) if a type/interface/block-data block starts after point.
 912 NAME is non-nil only for type."
 913   (cond
 914    ((looking-at f90-type-def-re)
 915     (list (match-string 1) (match-string 2)))
 916    ((looking-at "\\(interface\\|block[\t]*data\\)\\>")
 917     (list (match-string 1) nil))))
 918
 919 (defsubst f90-looking-at-program-block-start ()
 920   "Return (KIND NAME) if a program block with name NAME starts after point."
 921   (cond
 922    ((looking-at "\\(program\\)[ \t]+\\(\\sw+\\)\\>")
 923     (list (match-string 1) (match-string 2)))
 924    ((and (not (looking-at "module[ \t]*procedure\\>"))
 925          (looking-at "\\(module\\)[ \t]+\\(\\sw+\\)\\>"))
 926     (list (match-string 1) (match-string 2)))
 927    ((and (not (looking-at "end[ \t]*\\(function\\|subroutine\\)"))
 928          (looking-at "[^!'\"\&\n]*\\(function\\|subroutine\\)[ \t]+\
 929 \\(\\sw+\\)"))
 930     (list (match-string 1) (match-string 2)))))
 931
 932 (defsubst f90-looking-at-program-block-end ()
 933   "Return (KIND NAME) if a block with name NAME ends after point."
 934   (if (looking-at (concat "end[ \t]*" f90-blocks-re
 935                           "?\\([ \t]+\\(\\sw+\\)\\)?\\>"))
 936       (list (match-string 1) (match-string 3))))
 937
 938 (defsubst f90-comment-indent ()
 939   "Return the indentation to be used for a comment starting at point.
 940 Used for `comment-indent-function' by F90 mode.
 941 \"!!!\", `f90-directive-comment-re', variable `f90-comment-region' return 0.
 942 `f90-indented-comment-re' (if not trailing code) calls `f90-calculate-indent'.
 943 All others return `comment-column', leaving at least one space after code."
 944   (cond ((looking-at "!!!") 0)
 945         ((and f90-directive-comment-re
 946               (looking-at f90-directive-comment-re)) 0)
 947         ((looking-at (regexp-quote f90-comment-region)) 0)
 948         ((and (looking-at f90-indented-comment-re)
 949               ;; Don't attempt to indent trailing comment as code.
 950               (save-excursion
 951                 (skip-chars-backward " \t")
 952                 (bolp)))
 953          (f90-calculate-indent))
 954         (t (skip-chars-backward " \t")
 955            (max (if (bolp) 0 (1+ (current-column))) comment-column))))
 956
 957 (defsubst f90-present-statement-cont ()
 958   "Return continuation properties of present statement.
 959 Possible return values are:
 960 single - statement is not continued.
 961 begin  - current line is the first in a continued statement.
 962 end    - current line is the last in a continued statement
 963 middle - current line is neither first nor last in a continued statement.
 964 Comment lines embedded amongst continued lines return 'middle."
 965   (let (pcont cont)
 966     (save-excursion
 967       (setq pcont (if (f90-previous-statement) (f90-line-continued))))
 968     (setq cont (f90-line-continued))
 969     (cond ((and (not pcont) (not cont)) 'single)
 970           ((and (not pcont) cont)       'begin)
 971           ((and pcont       (not cont)) 'end)
 972           ((and pcont       cont)       'middle)
 973           (t (error "The impossible occurred")))))
 974
 975 (defsubst f90-indent-line-no ()
 976   "If `f90-leave-line-no' is nil, left-justify a line number.
 977 Leaves point at the first non-blank character after the line number.
 978 Call from beginning of line."
 979   (and (null f90-leave-line-no) (looking-at "[ \t]+[0-9]")
 980        (delete-horizontal-space))
 981   (skip-chars-forward " \t0-9"))
 982
 983 (defsubst f90-no-block-limit ()
 984   "Return nil if point is at the edge of a code block.
 985 Searches line forward for \"function\" or \"subroutine\",
 986 if all else fails."
 987   (save-excursion
 988     (not (or (looking-at "end")
 989              (looking-at "\\(do\\|if\\|else\\(if\\|where\\)?\
 990 \\|select[ \t]*case\\|case\\|where\\|forall\\)\\>")
 991              (looking-at "\\(program\\|module\\|interface\\|\
 992 block[ \t]*data\\)\\>")
 993              (looking-at "\\(contains\\|\\sw+[ \t]*:\\)")
 994              (looking-at f90-type-def-re)
 995              (re-search-forward "\\(function\\|subroutine\\)"
 996                                 (line-end-position) t)))))
 997
 998 (defsubst f90-update-line ()
 999   "Change case of current line as per `f90-auto-keyword-case'."
1000   (if f90-auto-keyword-case
1001       (f90-change-keywords f90-auto-keyword-case
1002                            (line-beginning-position) (line-end-position))))
1003 \f
1004 (defun f90-electric-insert ()
1005   "Change keyword case and auto-fill line as operators are inserted."
1006   (interactive)
1007   (self-insert-command 1)
1008   (if auto-fill-function (f90-do-auto-fill) ; also updates line
1009     (f90-update-line)))
1010
1011
1012 (defun f90-get-correct-indent ()
1013   "Get correct indent for a line starting with line number.
1014 Does not check type and subprogram indentation."
1015   (let ((epnt (line-end-position)) icol cont)
1016     (save-excursion
1017       (while (and (f90-previous-statement)
1018                   (or (progn
1019                         (setq cont (f90-present-statement-cont))
1020                         (or (eq cont 'end) (eq cont 'middle)))
1021                       (looking-at "[ \t]*[0-9]"))))
1022       (setq icol (current-indentation))
1023       (beginning-of-line)
1024       (when (re-search-forward "\\(if\\|do\\|select\\|where\\|forall\\)"
1025                                (line-end-position) t)
1026         (beginning-of-line)
1027         (skip-chars-forward " \t")
1028         (cond ((f90-looking-at-do)
1029                (setq icol (+ icol f90-do-indent)))
1030               ((or (f90-looking-at-if-then)
1031                    (f90-looking-at-where-or-forall)
1032                    (f90-looking-at-select-case))
1033                (setq icol (+ icol f90-if-indent))))
1034         (end-of-line))
1035       (while (re-search-forward
1036               "\\(if\\|do\\|select\\|where\\|forall\\)" epnt t)
1037         (beginning-of-line)
1038         (skip-chars-forward " \t0-9")
1039         (cond ((f90-looking-at-do)
1040                (setq icol (+ icol f90-do-indent)))
1041               ((or (f90-looking-at-if-then)
1042                    (f90-looking-at-where-or-forall)
1043                    (f90-looking-at-select-case))
1044                (setq icol (+ icol f90-if-indent)))
1045               ((looking-at f90-end-if-re)
1046                (setq icol (- icol f90-if-indent)))
1047               ((looking-at "end[ \t]*do\\>")
1048                (setq icol (- icol f90-do-indent))))
1049         (end-of-line))
1050       icol)))
1051
1052 (defun f90-calculate-indent ()
1053   "Calculate the indent column based on previous statements."
1054   (interactive)
1055   (let (icol cont (case-fold-search t) (pnt (point)))
1056     (save-excursion
1057       (if (not (f90-previous-statement))
1058           (setq icol 0)
1059         (setq cont (f90-present-statement-cont))
1060         (if (eq cont 'end)
1061             (while (not (eq 'begin (f90-present-statement-cont)))
1062               (f90-previous-statement)))
1063         (cond ((eq cont 'begin)
1064                (setq icol (+ (f90-current-indentation)
1065                              f90-continuation-indent)))
1066               ((eq cont 'middle) (setq icol (current-indentation)))
1067               (t (setq icol (f90-current-indentation))
1068                  (skip-chars-forward " \t")
1069                  (if (looking-at "[0-9]")
1070                      (setq icol (f90-get-correct-indent))
1071                    (cond ((or (f90-looking-at-if-then)
1072                               (f90-looking-at-where-or-forall)
1073                               (f90-looking-at-select-case)
1074                               (looking-at f90-else-like-re))
1075                           (setq icol (+ icol f90-if-indent)))
1076                          ((f90-looking-at-do)
1077                           (setq icol (+ icol f90-do-indent)))
1078                          ((f90-looking-at-type-like)
1079                           (setq icol (+ icol f90-type-indent)))
1080                          ((or (f90-looking-at-program-block-start)
1081                               (looking-at "contains[ \t]*\\($\\|!\\)"))
1082                           (setq icol (+ icol f90-program-indent)))))
1083                  (goto-char pnt)
1084                  (beginning-of-line)
1085                  (cond ((looking-at "[ \t]*$"))
1086                        ((looking-at "[ \t]*#") ; check for cpp directive
1087                         (setq icol 0))
1088                        (t
1089                         (skip-chars-forward " \t0-9")
1090                         (cond ((or (looking-at f90-else-like-re)
1091                                    (looking-at f90-end-if-re))
1092                                (setq icol (- icol f90-if-indent)))
1093                               ((looking-at "end[ \t]*do\\>")
1094                                (setq icol (- icol f90-do-indent)))
1095                               ((looking-at f90-end-type-re)
1096                                (setq icol (- icol f90-type-indent)))
1097                               ((or (looking-at "contains[ \t]*\\(!\\|$\\)")
1098                                    (f90-looking-at-program-block-end))
1099                                (setq icol (- icol f90-program-indent))))))
1100                  ))))
1101     icol))
1102 \f
1103 (defun f90-previous-statement ()
1104   "Move point to beginning of the previous F90 statement.
1105 Return nil if no previous statement is found.
1106 A statement is a line which is neither blank nor a comment."
1107   (interactive)
1108   (let (not-first-statement)
1109     (beginning-of-line)
1110     (while (and (setq not-first-statement (zerop (forward-line -1)))
1111                 (looking-at "[ \t0-9]*\\(!\\|$\\|#\\)")))
1112     not-first-statement))
1113
1114 (defun f90-next-statement ()
1115   "Move point to beginning of the next F90 statement.
1116 Return nil if no later statement is found."
1117   (interactive)
1118   (let (not-last-statement)
1119     (beginning-of-line)
1120     (while (and (setq not-last-statement
1121                       (and (zerop (forward-line 1))
1122                            (not (eobp))))
1123                 (looking-at "[ \t0-9]*\\(!\\|$\\)")))
1124     not-last-statement))
1125
1126 (defun f90-beginning-of-subprogram ()
1127   "Move point to the beginning of the current subprogram.
1128 Return (TYPE NAME), or nil if not found."
1129   (interactive)
1130   (let ((count 1) (case-fold-search t) matching-beg)
1131     (beginning-of-line)
1132     (while (and (> count 0)
1133                 (re-search-backward f90-program-block-re nil 'move))
1134       (beginning-of-line)
1135       (skip-chars-forward " \t0-9")
1136       (cond ((setq matching-beg (f90-looking-at-program-block-start))
1137              (setq count (1- count)))
1138             ((f90-looking-at-program-block-end)
1139              (setq count (1+ count)))))
1140     (beginning-of-line)
1141     (if (zerop count)
1142         matching-beg
1143       (message "No beginning found.")
1144       nil)))
1145
1146 (defun f90-end-of-subprogram ()
1147   "Move point to the end of the current subprogram.
1148 Return (TYPE NAME), or nil if not found."
1149   (interactive)
1150   (let ((case-fold-search t)
1151         (count 1)
1152         matching-end)
1153     (end-of-line)
1154     (while (and (> count 0)
1155                 (re-search-forward f90-program-block-re nil 'move))
1156       (beginning-of-line)
1157       (skip-chars-forward " \t0-9")
1158       (cond ((f90-looking-at-program-block-start)
1159              (setq count (1+ count)))
1160             ((setq matching-end (f90-looking-at-program-block-end))
1161              (setq count (1- count))))
1162       (end-of-line))
1163     ;; This means f90-end-of-subprogram followed by f90-start-of-subprogram
1164     ;; has a net non-zero effect, which seems odd.
1165 ;;;    (forward-line 1)
1166     (if (zerop count)
1167         matching-end
1168       (message "No end found.")
1169       nil)))
1170
1171
1172 (defun f90-end-of-block (&optional num)
1173   "Move point forward to the end of the current code block.
1174 With optional argument NUM, go forward that many balanced blocks.
1175 If NUM is negative, go backward to the start of a block.
1176 Checks for consistency of block types and labels (if present),
1177 and completes outermost block if necessary."
1178   (interactive "p")
1179   (if (and num (< num 0)) (f90-beginning-of-block (- num)))
1180   (let ((f90-smart-end nil)             ; for the final `f90-match-end'
1181         (case-fold-search t)
1182         (count (or num 1))
1183         start-list start-this start-type start-label end-type end-label)
1184     (if (interactive-p) (push-mark (point) t))
1185     (end-of-line)                       ; probably want this
1186     (while (and (> count 0) (re-search-forward f90-blocks-re nil 'move))
1187       (beginning-of-line)
1188       (skip-chars-forward " \t0-9")
1189       (cond ((or (f90-in-string) (f90-in-comment)))
1190             ((setq start-this
1191                    (or
1192                     (f90-looking-at-do)
1193                     (f90-looking-at-select-case)
1194                     (f90-looking-at-type-like)
1195                     (f90-looking-at-program-block-start)
1196                     (f90-looking-at-if-then)
1197                     (f90-looking-at-where-or-forall)))
1198              (setq start-list (cons start-this start-list) ; not add-to-list!
1199                    count (1+ count)))
1200             ((looking-at (concat "end[ \t]*" f90-blocks-re
1201                                  "[ \t]*\\(\\sw+\\)?"))
1202              (setq end-type (match-string 1)
1203                    end-label (match-string 2)
1204                    count (1- count))
1205              ;; Check any internal blocks.
1206              (when start-list
1207                (setq start-this (car start-list)
1208                      start-list (cdr start-list)
1209                      start-type (car start-this)
1210                      start-label (cadr start-this))
1211                (or (f90-equal-symbols start-type end-type)
1212                    (error "End type `%s' does not match start type `%s'"
1213                           end-type start-type))
1214                (or (f90-equal-symbols start-label end-label)
1215                    (error "End label `%s' does not match start label `%s'"
1216                           end-label start-label)))))
1217       (end-of-line))
1218     (if (> count 0) (error "Missing block end"))
1219     ;; Check outermost block.
1220     (if (interactive-p)
1221         (save-excursion
1222           (beginning-of-line)
1223           (skip-chars-forward " \t0-9")
1224           (f90-match-end)))))
1225
1226 (defun f90-beginning-of-block (&optional num)
1227   "Move point backwards to the start of the current code block.
1228 With optional argument NUM, go backward that many balanced blocks.
1229 If NUM is negative, go forward to the end of a block.
1230 Checks for consistency of block types and labels (if present).
1231 Does not check the outermost block, because it may be incomplete."
1232   (interactive "p")
1233   (if (and num (< num 0)) (f90-end-of-block (- num)))
1234   (let ((case-fold-search t)
1235         (count (or num 1))
1236         end-list end-this end-type end-label
1237         start-this start-type start-label)
1238     (if (interactive-p) (push-mark (point) t))
1239     (beginning-of-line)                 ; probably want this
1240     (while (and (> count 0) (re-search-backward f90-blocks-re nil 'move))
1241       (beginning-of-line)
1242       (skip-chars-forward " \t0-9")
1243       (cond ((or (f90-in-string) (f90-in-comment)))
1244             ((looking-at (concat "end[ \t]*" f90-blocks-re
1245                                  "[ \t]*\\(\\sw+\\)?"))
1246              (setq end-list (cons (list (match-string 1) (match-string 2))
1247                                   end-list)
1248                    count (1+ count)))
1249             ((setq start-this
1250                    (or
1251                     (f90-looking-at-do)
1252                     (f90-looking-at-select-case)
1253                     (f90-looking-at-type-like)
1254                     (f90-looking-at-program-block-start)
1255                     (f90-looking-at-if-then)
1256                     (f90-looking-at-where-or-forall)))
1257              (setq start-type (car start-this)
1258                    start-label (cadr start-this)
1259                    count (1- count))
1260              ;; Check any internal blocks.
1261              (when end-list
1262                (setq end-this (car end-list)
1263                      end-list (cdr end-list)
1264                      end-type (car end-this)
1265                      end-label (cadr end-this))
1266                (or (f90-equal-symbols start-type end-type)
1267                    (error "Start type `%s' does not match end type `%s'"
1268                           start-type end-type))
1269                (or (f90-equal-symbols start-label end-label)
1270                    (error "Start label `%s' does not match end label `%s'"
1271                           start-label end-label))))))
1272      (if (> count 0) (error "Missing block start"))))
1273
1274 (defun f90-next-block (&optional num)
1275   "Move point forward to the next end or start of a code block.
1276 With optional argument NUM, go forward that many blocks.
1277 If NUM is negative, go backwards.
1278 A block is a subroutine, if-endif, etc."
1279   (interactive "p")
1280   (let ((case-fold-search t)
1281         (count (if num (abs num) 1)))
1282     (while (and (> count 0)
1283                 (if (> num 0) (re-search-forward f90-blocks-re nil 'move)
1284                   (re-search-backward f90-blocks-re nil 'move)))
1285       (beginning-of-line)
1286       (skip-chars-forward " \t0-9")
1287       (cond ((or (f90-in-string) (f90-in-comment)))
1288             ((or
1289               (looking-at "end[ \t]*")
1290               (f90-looking-at-do)
1291               (f90-looking-at-select-case)
1292               (f90-looking-at-type-like)
1293               (f90-looking-at-program-block-start)
1294               (f90-looking-at-if-then)
1295               (f90-looking-at-where-or-forall))
1296              (setq count (1- count))))
1297       (if (> num 0) (end-of-line)
1298         (beginning-of-line)))))
1299
1300
1301 (defun f90-previous-block (&optional num)
1302   "Move point backward to the previous end or start of a code block.
1303 With optional argument NUM, go backward that many blocks.
1304 If NUM is negative, go forwards.
1305 A block is a subroutine, if-endif, etc."
1306   (interactive "p")
1307   (f90-next-block (- (or num 1))))
1308
1309
1310 (defun f90-mark-subprogram ()
1311   "Put mark at end of F90 subprogram, point at beginning, push mark."
1312   (interactive)
1313   (let ((pos (point)) program)
1314     (f90-end-of-subprogram)
1315     (push-mark)
1316     (goto-char pos)
1317     (setq program (f90-beginning-of-subprogram))
1318     (if (fboundp 'zmacs-activate-region)
1319         (zmacs-activate-region)
1320       (setq mark-active t
1321             deactivate-mark nil))
1322     program))
1323
1324 (defun f90-comment-region (beg-region end-region)
1325   "Comment/uncomment every line in the region.
1326 Insert the variable `f90-comment-region' at the start of every line
1327 in the region, or, if already present, remove it."
1328   (interactive "*r")
1329   (let ((end (copy-marker end-region)))
1330     (goto-char beg-region)
1331     (beginning-of-line)
1332     (if (looking-at (regexp-quote f90-comment-region))
1333         (delete-region (point) (match-end 0))
1334       (insert f90-comment-region))
1335     (while (and (zerop (forward-line 1))
1336                 (< (point) end))
1337       (if (looking-at (regexp-quote f90-comment-region))
1338           (delete-region (point) (match-end 0))
1339         (insert f90-comment-region)))
1340     (set-marker end nil)))
1341
1342 (defun f90-indent-line (&optional no-update)
1343   "Indent current line as F90 code.
1344 Unless optional argument NO-UPDATE is non-nil, call `f90-update-line'
1345 after indenting."
1346   (interactive "*P")
1347   (let ((case-fold-search t)
1348         (pos (point-marker))
1349         indent no-line-number)
1350     (beginning-of-line)           ; digits after & \n are not line-nos
1351     (if (not (save-excursion (and (f90-previous-statement)
1352                                   (f90-line-continued))))
1353         (f90-indent-line-no)
1354       (setq no-line-number t)
1355       (skip-chars-forward " \t"))
1356     (if (looking-at "!")
1357         (setq indent (f90-comment-indent))
1358       (and f90-smart-end (looking-at "end")
1359            (f90-match-end))
1360       (setq indent (f90-calculate-indent)))
1361     (or (= indent (current-column))
1362         (f90-indent-to indent no-line-number))
1363     ;; If initial point was within line's indentation,
1364     ;; position after the indentation.  Else stay at same point in text.
1365     (and (< (point) pos)
1366          (goto-char pos))
1367     (if auto-fill-function
1368         ;; GM NO-UPDATE not honoured, since this calls f90-update-line.
1369         (f90-do-auto-fill)
1370       (or no-update (f90-update-line)))
1371     (set-marker pos nil)))
1372
1373 (defun f90-indent-new-line ()
1374   "Re-indent current line, insert a newline and indent the newline.
1375 An abbrev before point is expanded if the variable `abbrev-mode' is non-nil.
1376 If run in the middle of a line, the line is not broken."
1377   (interactive "*")
1378   (if abbrev-mode (expand-abbrev))
1379   (beginning-of-line)             ; reindent where likely to be needed
1380   (f90-indent-line)                ; calls indent-line-no, update-line
1381   (end-of-line)
1382   (delete-horizontal-space)             ; destroy trailing whitespace
1383   (let ((string (f90-in-string))
1384         (cont (f90-line-continued)))
1385     (and string (not cont) (insert "&"))
1386     (newline)
1387     (if (or string (and cont f90-beginning-ampersand)) (insert "&")))
1388   (f90-indent-line 'no-update))         ; nothing to update
1389
1390
1391 (defun f90-indent-region (beg-region end-region)
1392   "Indent every line in region by forward parsing."
1393   (interactive "*r")
1394   (let ((end-region-mark (copy-marker end-region))
1395         (save-point (point-marker))
1396         block-list ind-lev ind-curr ind-b cont struct beg-struct end-struct)
1397     (goto-char beg-region)
1398     ;; First find a line which is not a continuation line or comment.
1399     (beginning-of-line)
1400     (while (and (looking-at "[ \t]*[0-9]*\\(!\\|#\\|[ \t]*$\\)")
1401                 (progn (f90-indent-line 'no-update)
1402                        (zerop (forward-line 1)))
1403                 (< (point) end-region-mark)))
1404     (setq cont (f90-present-statement-cont))
1405     (while (and (or (eq cont 'middle) (eq cont 'end))
1406                 (f90-previous-statement))
1407       (setq cont (f90-present-statement-cont)))
1408     ;; Process present line for beginning of block.
1409     (setq f90-cache-position (point))
1410     (f90-indent-line 'no-update)
1411     (setq ind-lev (f90-current-indentation)
1412           ind-curr ind-lev)
1413     (beginning-of-line)
1414     (skip-chars-forward " \t0-9")
1415     (setq struct nil
1416           ind-b (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
1417                       ((or (setq struct (f90-looking-at-if-then))
1418                            (setq struct (f90-looking-at-select-case))
1419                            (setq struct (f90-looking-at-where-or-forall))
1420                            (looking-at f90-else-like-re))
1421                        f90-if-indent)
1422                       ((setq struct (f90-looking-at-type-like))
1423                        f90-type-indent)
1424                       ((or (setq struct (f90-looking-at-program-block-start))
1425                            (looking-at "contains[ \t]*\\($\\|!\\)"))
1426                        f90-program-indent)))
1427     (if ind-b (setq ind-lev (+ ind-lev ind-b)))
1428     (if struct (setq block-list (cons struct block-list)))
1429     (while (and (f90-line-continued) (zerop (forward-line 1))
1430                 (< (point) end-region-mark))
1431       (if (looking-at "[ \t]*!")
1432           (f90-indent-to (f90-comment-indent))
1433         (or (= (current-indentation)
1434                (+ ind-curr f90-continuation-indent))
1435             (f90-indent-to (+ ind-curr f90-continuation-indent) 'no-line-no))))
1436     ;; Process all following lines.
1437     (while (and (zerop (forward-line 1)) (< (point) end-region-mark))
1438       (beginning-of-line)
1439       (f90-indent-line-no)
1440       (setq f90-cache-position (point))
1441       (cond ((looking-at "[ \t]*$") (setq ind-curr 0))
1442             ((looking-at "[ \t]*#") (setq ind-curr 0))
1443             ((looking-at "!") (setq ind-curr (f90-comment-indent)))
1444             ((f90-no-block-limit) (setq ind-curr ind-lev))
1445             ((looking-at f90-else-like-re) (setq ind-curr
1446                                                  (- ind-lev f90-if-indent)))
1447             ((looking-at "contains[ \t]*\\($\\|!\\)")
1448              (setq ind-curr (- ind-lev f90-program-indent)))
1449             ((setq ind-b
1450                    (cond ((setq struct (f90-looking-at-do)) f90-do-indent)
1451                          ((or (setq struct (f90-looking-at-if-then))
1452                               (setq struct (f90-looking-at-select-case))
1453                               (setq struct (f90-looking-at-where-or-forall)))
1454                           f90-if-indent)
1455                          ((setq struct (f90-looking-at-type-like))
1456                           f90-type-indent)
1457                          ((setq struct (f90-looking-at-program-block-start))
1458                           f90-program-indent)))
1459              (setq ind-curr ind-lev)
1460              (if ind-b (setq ind-lev (+ ind-lev ind-b)))
1461              (setq block-list (cons struct block-list)))
1462             ((setq end-struct (f90-looking-at-program-block-end))
1463              (setq beg-struct (car block-list)
1464                    block-list (cdr block-list))
1465              (if f90-smart-end
1466                  (save-excursion
1467                    (f90-block-match (car beg-struct) (car (cdr beg-struct))
1468                                     (car end-struct) (car (cdr end-struct)))))
1469              (setq ind-b
1470                    (cond ((looking-at f90-end-if-re) f90-if-indent)
1471                          ((looking-at "end[ \t]*do\\>")  f90-do-indent)
1472                          ((looking-at f90-end-type-re) f90-type-indent)
1473                          ((f90-looking-at-program-block-end)
1474                           f90-program-indent)))
1475              (if ind-b (setq ind-lev (- ind-lev ind-b)))
1476              (setq ind-curr ind-lev))
1477             (t (setq ind-curr ind-lev)))
1478       ;; Do the indentation if necessary.
1479       (or (= ind-curr (current-column))
1480           (f90-indent-to ind-curr))
1481       (while (and (f90-line-continued) (zerop (forward-line 1))
1482                   (< (point) end-region-mark))
1483         (if (looking-at "[ \t]*!")
1484             (f90-indent-to (f90-comment-indent))
1485           (or (= (current-indentation)
1486                  (+ ind-curr f90-continuation-indent))
1487               (f90-indent-to
1488                (+ ind-curr f90-continuation-indent) 'no-line-no)))))
1489     ;; Restore point, etc.
1490     (setq f90-cache-position nil)
1491     (goto-char save-point)
1492     (set-marker end-region-mark nil)
1493     (set-marker save-point nil)
1494     (if (fboundp 'zmacs-deactivate-region)
1495         (zmacs-deactivate-region)
1496       (deactivate-mark))))
1497
1498 (defun f90-indent-subprogram ()
1499   "Properly indent the subprogram containing point."
1500   (interactive "*")
1501   (save-excursion
1502     (let ((program (f90-mark-subprogram)))
1503       (if program
1504           (progn
1505             (message "Indenting %s %s..."
1506                      (car program) (car (cdr program)))
1507             (indent-region (point) (mark) nil)
1508             (message "Indenting %s %s...done"
1509                      (car program) (car (cdr program))))
1510         (message "Indenting the whole file...")
1511         (indent-region (point) (mark) nil)
1512         (message "Indenting the whole file...done")))))
1513
1514 (defun f90-break-line (&optional no-update)
1515   "Break line at point, insert continuation marker(s) and indent.
1516 Unless in a string or comment, or if the optional argument NO-UPDATE
1517 is non-nil, call `f90-update-line' after inserting the continuation marker."
1518   (interactive "*P")
1519   (cond ((f90-in-string)
1520          (insert "&\n&"))
1521         ((f90-in-comment)
1522          (insert "\n" (f90-get-present-comment-type)))
1523         (t (insert "&")
1524            (or no-update (f90-update-line))
1525            (newline 1)
1526            (if f90-beginning-ampersand (insert "&"))))
1527   (indent-according-to-mode))
1528
1529 (defun f90-find-breakpoint ()
1530   "From `fill-column', search backward for break-delimiter."
1531   (re-search-backward f90-break-delimiters (line-beginning-position))
1532   (if (not f90-break-before-delimiters)
1533       (forward-char (if (looking-at f90-no-break-re) 2 1))
1534     (backward-char)
1535     (or (looking-at f90-no-break-re)
1536         (forward-char))))
1537
1538 (defun f90-do-auto-fill ()
1539   "Break line if non-white characters beyond `fill-column'.
1540 Update keyword case first."
1541   (interactive "*")
1542   ;; Break line before or after last delimiter (non-word char) if
1543   ;; position is beyond fill-column.
1544   ;; Will not break **, //, or => (as specified by f90-no-break-re).
1545   (f90-update-line)
1546   ;; Need this for `f90-electric-insert' and other f90- callers.
1547   (unless (and (boundp 'comment-auto-fill-only-comments)
1548                comment-auto-fill-only-comments
1549                (not (f90-in-comment)))
1550     (while (> (current-column) fill-column)
1551       (let ((pos-mark (point-marker)))
1552         (move-to-column fill-column)
1553         (or (f90-in-string) (f90-find-breakpoint))
1554         (f90-break-line)
1555         (goto-char pos-mark)
1556         (set-marker pos-mark nil)))))
1557
1558 (defun f90-join-lines (&optional arg)
1559   "Join current line to previous, fix whitespace, continuation, comments.
1560 With optional argument ARG, join current line to following line.
1561 Like `join-line', but handles F90 syntax."
1562   (interactive "*P")
1563   (beginning-of-line)
1564   (if arg (forward-line 1))
1565   (when (eq (preceding-char) ?\n)
1566     (skip-chars-forward " \t")
1567     (if (looking-at "\&") (delete-char 1))
1568     (beginning-of-line)
1569     (delete-region (point) (1- (point)))
1570     (skip-chars-backward " \t")
1571     (and (eq (preceding-char) ?&) (delete-char -1))
1572     (and (f90-in-comment)
1573          (looking-at "[ \t]*!+")
1574          (replace-match ""))
1575     (or (f90-in-string)
1576         (fixup-whitespace))))
1577
1578 (defun f90-fill-region (beg-region end-region)
1579   "Fill every line in region by forward parsing.  Join lines if possible."
1580   (interactive "*r")
1581   (let ((end-region-mark (copy-marker end-region))
1582         (go-on t)
1583         f90-smart-end f90-auto-keyword-case auto-fill-function)
1584     (goto-char beg-region)
1585     (while go-on
1586       ;; Join as much as possible.
1587       (while (progn
1588                (end-of-line)
1589                (skip-chars-backward " \t")
1590                (eq (preceding-char) ?&))
1591         (f90-join-lines 'forward))
1592       ;; Chop the line if necessary.
1593       (while (> (save-excursion (end-of-line) (current-column))
1594                 fill-column)
1595         (move-to-column fill-column)
1596         (f90-find-breakpoint)
1597         (f90-break-line 'no-update))
1598       (setq go-on (and (< (point) end-region-mark)
1599                        (zerop (forward-line 1)))
1600             f90-cache-position (point)))
1601     (setq f90-cache-position nil)
1602     (set-marker end-region-mark nil)
1603     (if (fboundp 'zmacs-deactivate-region)
1604         (zmacs-deactivate-region)
1605       (deactivate-mark))))
1606 \f
1607 (defun f90-block-match (beg-block beg-name end-block end-name)
1608   "Match end-struct with beg-struct and complete end-block if possible.
1609 BEG-BLOCK is the type of block as indicated at the start (e.g., do).
1610 BEG-NAME is the block start name (may be nil).
1611 END-BLOCK is the type of block as indicated at the end (may be nil).
1612 END-NAME is the block end name (may be nil).
1613 Leave point at the end of line."
1614   (search-forward "end" (line-end-position))
1615   (catch 'no-match
1616     (if (f90-equal-symbols beg-block end-block)
1617         (search-forward end-block)
1618       (if end-block
1619           (progn
1620             (message "END %s does not match %s." end-block beg-block)
1621             (end-of-line)
1622             (throw 'no-match nil))
1623         (message "Inserting %s." beg-block)
1624         (insert (concat " " beg-block))))
1625     (if (f90-equal-symbols beg-name end-name)
1626         (and end-name (search-forward end-name))
1627       (cond ((and beg-name (not end-name))
1628              (message "Inserting %s." beg-name)
1629              (insert (concat " " beg-name)))
1630             ((and beg-name end-name)
1631              (message "Replacing %s with %s." end-name beg-name)
1632              (search-forward end-name)
1633              (replace-match beg-name))
1634             ((and (not beg-name) end-name)
1635              (message "Deleting %s." end-name)
1636              (search-forward end-name)
1637              (replace-match ""))))
1638     (or (looking-at "[ \t]*!") (delete-horizontal-space))))
1639
1640 (defun f90-match-end ()
1641   "From an end block statement, find the corresponding block and name."
1642   (interactive)
1643   (let ((count 1)
1644         (top-of-window (window-start))
1645         (end-point (point))
1646         (case-fold-search t)
1647         matching-beg beg-name end-name beg-block end-block end-struct)
1648     (when (save-excursion (beginning-of-line) (skip-chars-forward " \t0-9")
1649                           (setq end-struct (f90-looking-at-program-block-end)))
1650       (setq end-block (car end-struct)
1651             end-name  (car (cdr end-struct)))
1652       (save-excursion
1653         (beginning-of-line)
1654         (while (and (> count 0) (re-search-backward f90-blocks-re nil t))
1655           (beginning-of-line)
1656           ;; GM not a line number if continued line.
1657 ;;;          (skip-chars-forward " \t")
1658 ;;;          (skip-chars-forward "0-9")
1659           (skip-chars-forward " \t0-9")
1660           (cond ((or (f90-in-string) (f90-in-comment)))
1661                 ((setq matching-beg
1662                        (or
1663                         (f90-looking-at-do)
1664                         (f90-looking-at-if-then)
1665                         (f90-looking-at-where-or-forall)
1666                         (f90-looking-at-select-case)
1667                         (f90-looking-at-type-like)
1668                         (f90-looking-at-program-block-start)))
1669                  (setq count (1- count)))
1670                 ((looking-at (concat "end[ \t]*" f90-blocks-re))
1671                  (setq count (1+ count)))))
1672         (if (> count 0)
1673             (message "No matching beginning.")
1674           (f90-update-line)
1675           (if (eq f90-smart-end 'blink)
1676               (if (< (point) top-of-window)
1677                   (message "Matches %s: %s"
1678                            (what-line)
1679                            (buffer-substring
1680                             (line-beginning-position)
1681                             (line-end-position)))
1682                 (sit-for 1)))
1683           (setq beg-block (car matching-beg)
1684                 beg-name (car (cdr matching-beg)))
1685           (goto-char end-point)
1686           (beginning-of-line)
1687           (f90-block-match beg-block beg-name end-block end-name))))))
1688
1689 (defun f90-insert-end ()
1690   "Insert a complete end statement matching beginning of present block."
1691   (interactive "*")
1692   (let ((f90-smart-end (or f90-smart-end 'blink)))
1693     (insert "end")
1694     (f90-indent-new-line)))
1695 \f
1696 ;; Abbrevs and keywords.
1697
1698 (defun f90-abbrev-start ()
1699   "Typing `\\[help-command] or `? lists all the F90 abbrevs.
1700 Any other key combination is executed normally."
1701   (interactive "*")
1702   (insert last-command-char)
1703   (let (char event)
1704     (if (fboundp 'next-command-event) ; XEmacs
1705         (setq event (next-command-event)
1706               char (event-to-character event))
1707       (setq event (read-event)
1708             char event))
1709     ;; Insert char if not equal to `?', or if abbrev-mode is off.
1710     (if (and abbrev-mode (or (eq char ??) (eq char help-char)))
1711         (f90-abbrev-help)
1712       (setq unread-command-events (list event)))))
1713
1714 (defun f90-abbrev-help ()
1715   "List the currently defined abbrevs in F90 mode."
1716   (interactive)
1717   (message "Listing abbrev table...")
1718   (display-buffer (f90-prepare-abbrev-list-buffer))
1719   (message "Listing abbrev table...done"))
1720
1721 (defun f90-prepare-abbrev-list-buffer ()
1722   "Create a buffer listing the F90 mode abbreviations."
1723   (save-excursion
1724     (set-buffer (get-buffer-create "*Abbrevs*"))
1725     (erase-buffer)
1726     (insert-abbrev-table-description 'f90-mode-abbrev-table t)
1727     (goto-char (point-min))
1728     (set-buffer-modified-p nil)
1729     (edit-abbrevs-mode))
1730   (get-buffer-create "*Abbrevs*"))
1731
1732 (defun f90-upcase-keywords ()
1733   "Upcase all F90 keywords in the buffer."
1734   (interactive "*")
1735   (f90-change-keywords 'upcase-word))
1736
1737 (defun f90-capitalize-keywords ()
1738   "Capitalize all F90 keywords in the buffer."
1739   (interactive "*")
1740   (f90-change-keywords 'capitalize-word))
1741
1742 (defun f90-downcase-keywords ()
1743   "Downcase all F90 keywords in the buffer."
1744   (interactive "*")
1745   (f90-change-keywords 'downcase-word))
1746
1747 (defun f90-upcase-region-keywords (beg end)
1748   "Upcase all F90 keywords in the region."
1749   (interactive "*r")
1750   (f90-change-keywords 'upcase-word beg end))
1751
1752 (defun f90-capitalize-region-keywords (beg end)
1753   "Capitalize all F90 keywords in the region."
1754   (interactive "*r")
1755   (f90-change-keywords 'capitalize-word beg end))
1756
1757 (defun f90-downcase-region-keywords (beg end)
1758   "Downcase all F90 keywords in the region."
1759   (interactive "*r")
1760   (f90-change-keywords 'downcase-word beg end))
1761
1762 ;; Change the keywords according to argument.
1763 (defun f90-change-keywords (change-word &optional beg end)
1764   "Change the case of F90 keywords in the region (if specified) or buffer.
1765 CHANGE-WORD should be one of 'upcase-word, 'downcase-word, 'capitalize-word."
1766   (save-excursion
1767     (setq beg (or beg (point-min))
1768           end (or end (point-max)))
1769     (let ((keyword-re
1770            (concat "\\("
1771                    f90-keywords-re "\\|" f90-procedures-re "\\|"
1772                    f90-hpf-keywords-re "\\|" f90-operators-re "\\)"))
1773           (ref-point (point-min))
1774           (modified (buffer-modified-p))
1775           state saveword back-point)
1776       (goto-char beg)
1777       (unwind-protect
1778           (while (re-search-forward keyword-re end t)
1779             (unless (progn
1780                       (setq state (parse-partial-sexp ref-point (point)))
1781                       (or (nth 3 state) (nth 4 state)
1782                           ;; GM f90-directive-comment-re?
1783                           (save-excursion ; check for cpp directive
1784                             (beginning-of-line)
1785                             (skip-chars-forward " \t0-9")
1786                             (looking-at "#"))))
1787               (setq ref-point (point)
1788                     back-point (save-excursion (backward-word 1) (point))
1789                     saveword (buffer-substring back-point ref-point))
1790               (funcall change-word -1)
1791               (or (string= saveword (buffer-substring back-point ref-point))
1792                   (setq modified t))))
1793         (or modified (set-buffer-modified-p nil))))))
1794
1795
1796 (defun f90-current-defun ()
1797   "Function to use for `add-log-current-defun-function' in F90 mode."
1798   (save-excursion
1799     (nth 1 (f90-beginning-of-subprogram))))
1800
1801 (provide 'f90)
1802
1803 ;;; arch-tag: fceac97c-c147-44bd-aec0-172d4b560ef8
1804 ;;; f90.el ends here