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1 ;;; simula.el --- SIMULA 87 code editing commands for Emacs
2
3 ;; Copyright (C) 1992, 1994, 1996, 2001, 2002, 2003, 2004, 2005, 2006,
4 ;; 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
5
6 ;; Author: Hans Henrik Eriksen <hhe@ifi.uio.no>
7 ;; Maintainer: simula-mode@ifi.uio.no
8 ;; (above email addresses invalid as of April 2008)
9 ;; Adapted-By: ESR
10 ;; Keywords: languages
11
12 ;; This file is part of GNU Emacs.
13
14 ;; GNU Emacs is free software: you can redistribute it and/or modify
15 ;; it under the terms of the GNU General Public License as published by
16 ;; the Free Software Foundation, either version 3 of the License, or
17 ;; (at your option) any later version.
18
19 ;; GNU Emacs is distributed in the hope that it will be useful,
20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 ;; GNU General Public License for more details.
23
24 ;; You should have received a copy of the GNU General Public License
25 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
26
27 ;;; Commentary:
28
29 ;; A major mode for editing the Simula language. It knows about Simula
30 ;; syntax and standard indentation commands. It also provides convenient
31 ;; abbrevs for Simula keywords.
32 ;;
33 ;; Hans Henrik Eriksen (the author) may be reached at:
34 ;; Institutt for informatikk,
35 ;; Universitetet i Oslo
36
37 ;;; Code:
38
39 \f
40 (defgroup simula nil
41 "Major mode for editing Simula code."
42 :link '(custom-group-link :tag "Font Lock Faces group" font-lock-faces)
43 :prefix "simula-"
44 :group 'languages)
45
46 (defconst simula-tab-always-indent-default nil
47 "Non-nil means TAB in SIMULA mode should always reindent the current line.
48 Otherwise TAB indents only when point is within
49 the run of whitespace at the beginning of the line.")
50
51 (defcustom simula-tab-always-indent simula-tab-always-indent-default
52 "*Non-nil means TAB in SIMULA mode should always reindent the current line.
53 Otherwise TAB indents only when point is within
54 the run of whitespace at the beginning of the line."
55 :type 'boolean
56 :group 'simula)
57
58 (defconst simula-indent-level-default 3
59 "Indentation of SIMULA statements with respect to containing block.")
60
61 (defcustom simula-indent-level simula-indent-level-default
62 "*Indentation of SIMULA statements with respect to containing block."
63 :type 'integer
64 :group 'simula)
65
66
67 (defconst simula-substatement-offset-default 3
68 "Extra indentation after DO, THEN, ELSE, WHEN and OTHERWISE.")
69
70 (defcustom simula-substatement-offset simula-substatement-offset-default
71 "*Extra indentation after DO, THEN, ELSE, WHEN and OTHERWISE."
72 :type 'integer
73 :group 'simula)
74
75 (defconst simula-continued-statement-offset-default 3
76 "Extra indentation for lines not starting a statement or substatement.
77 If value is a list, each line in a multipleline continued statement
78 will have the car of the list extra indentation with respect to
79 the previous line of the statement.")
80
81 (defcustom simula-continued-statement-offset
82 simula-continued-statement-offset-default
83 "*Extra indentation for lines not starting a statement or substatement.
84 If value is a list, each line in a multipleline continued statement
85 will have the car of the list extra indentation with respect to
86 the previous line of the statement."
87 :type 'integer
88 :group 'simula)
89
90 (defconst simula-label-offset-default -4711
91 "Offset of SIMULA label lines relative to usual indentation.")
92
93 (defcustom simula-label-offset simula-label-offset-default
94 "*Offset of SIMULA label lines relative to usual indentation."
95 :type 'integer
96 :group 'simula)
97
98 (defconst simula-if-indent-default '(0 . 0)
99 "Extra indentation of THEN and ELSE with respect to the starting IF.
100 Value is a cons cell, the car is extra THEN indentation and the cdr
101 extra ELSE indentation. IF after ELSE is indented as the starting IF.")
102
103 (defcustom simula-if-indent simula-if-indent-default
104 "*Extra indentation of THEN and ELSE with respect to the starting IF.
105 Value is a cons cell, the car is extra THEN indentation and the cdr
106 extra ELSE indentation. IF after ELSE is indented as the starting IF."
107 :type '(cons integer integer)
108 :group 'simula)
109
110 (defconst simula-inspect-indent-default '(0 . 0)
111 "Extra indentation of WHEN and OTHERWISE with respect to the INSPECT.
112 Value is a cons cell, the car is extra WHEN indentation
113 and the cdr extra OTHERWISE indentation.")
114
115 (defcustom simula-inspect-indent simula-inspect-indent-default
116 "*Extra indentation of WHEN and OTHERWISE with respect to the INSPECT.
117 Value is a cons cell, the car is extra WHEN indentation
118 and the cdr extra OTHERWISE indentation."
119 :type '(cons integer integer)
120 :group 'simula)
121
122 (defconst simula-electric-indent-default nil
123 "Non-nil means `simula-indent-line' function may reindent previous line.")
124
125 (defcustom simula-electric-indent simula-electric-indent-default
126 "*Non-nil means `simula-indent-line' function may reindent previous line."
127 :type 'boolean
128 :group 'simula)
129
130 (defconst simula-abbrev-keyword-default 'upcase
131 "Specify how to convert case for SIMULA keywords.
132 Value is one of the symbols `upcase', `downcase', `capitalize',
133 \(as in) `abbrev-table' or nil if they should not be changed.")
134
135 (defcustom simula-abbrev-keyword simula-abbrev-keyword-default
136 "*Specify how to convert case for SIMULA keywords.
137 Value is one of the symbols `upcase', `downcase', `capitalize',
138 \(as in) `abbrev-table' or nil if they should not be changed."
139 :type '(choice (const upcase) (const downcase) (const capitalize)(const nil))
140 :group 'simula)
141
142 (defconst simula-abbrev-stdproc-default 'abbrev-table
143 "Specify how to convert case for standard SIMULA procedure and class names.
144 Value is one of the symbols `upcase', `downcase', `capitalize',
145 \(as in) `abbrev-table', or nil if they should not be changed.")
146
147 (defcustom simula-abbrev-stdproc simula-abbrev-stdproc-default
148 "*Specify how to convert case for standard SIMULA procedure and class names.
149 Value is one of the symbols `upcase', `downcase', `capitalize',
150 \(as in) `abbrev-table', or nil if they should not be changed."
151 :type '(choice (const upcase) (const downcase) (const capitalize)
152 (const abbrev-table) (const nil))
153 :group 'simula)
154
155 (defcustom simula-abbrev-file nil
156 "*File with extra abbrev definitions for use in SIMULA mode.
157 These are used together with the standard abbrev definitions for SIMULA.
158 Please note that the standard definitions are required
159 for SIMULA mode to function correctly."
160 :type '(choice file (const nil))
161 :group 'simula)
162
163 (defvar simula-mode-syntax-table nil
164 "Syntax table in SIMULA mode buffers.")
165
166 (defconst simula-font-lock-syntactic-keywords
167 `(;; `comment' directive.
168 ("\\<\\(c\\)omment\\>" 1 "<")
169 ;; end comments
170 (,(concat "\\<end\\>\\([^;\n]\\).*?\\(\n\\|\\(.\\)\\(;\\|"
171 (regexp-opt '("end" "else" "when" "otherwise"))
172 "\\)\\)")
173 (1 "< b")
174 (3 "> b" nil t))
175 ;; non-quoted single-quote char.
176 ("'\\('\\)'" 1 ".")))
177
178 ;; Regexps written with help from Alf-Ivar Holm <alfh@ifi.uio.no>.
179 (defconst simula-font-lock-keywords-1
180 '(;;
181 ;; Compiler directives.
182 ("^%\\([^ \t\n].*\\)" 1 font-lock-constant-face t)
183 ;;
184 ;; Class and procedure names.
185 ("\\<\\(class\\|procedure\\)\\>[ \t]*\\(\\sw+\\)?"
186 (1 font-lock-keyword-face) (2 font-lock-function-name-face nil t)))
187 "Subdued level highlighting for Simula mode.")
188
189 (defconst simula-font-lock-keywords-2
190 (append simula-font-lock-keywords-1
191 (list
192 ;;
193 ;; Constants.
194 '("\\<\\(false\\|none\\|notext\\|true\\)\\>" . font-lock-constant-face)
195 ;;
196 ;; Keywords.
197 (regexp-opt
198 '("activate" "after" "and" "at" "before" "begin" "delay" "do"
199 "else" "end" "eq" "eqv" "external" "for" "ge" "go" "goto" "gt"
200 "hidden" "if" "imp" "in" "inner" "inspect" "is" "label" "le"
201 "lt" "ne" "new" "not" "or" "otherwise" "prior" "protected"
202 "qua" "reactivate" "step" "switch" "then" "this" "to" "until"
203 "virtual" "when" "while") 'words)
204 ;;
205 ;; Types.
206 (cons (regexp-opt
207 '("array" "boolean" "character" "integer"
208 "long" "name" "real" "short" "text" "value" "ref") 'words)
209 'font-lock-type-face)))
210 "Medium level highlighting for Simula mode.")
211
212 (defconst simula-font-lock-keywords-3
213 (append simula-font-lock-keywords-2
214 (list
215 ;;
216 ;; Super-class names and super-slow.
217 '("\\<\\(\\sw+\\)[ \t]+class\\>" 1 font-lock-function-name-face)
218 ;;
219 ;; Types and their declarations.
220 (list (concat "\\<\\(array\\|boolean\\|character\\|integer\\|"
221 "long\\|name\\|real\\|short\\|text\\|value\\)\\>"
222 "\\([ \t]+\\sw+\\>\\)*")
223 '(font-lock-match-c-style-declaration-item-and-skip-to-next
224 ;; Start with point after all type specifiers.
225 (goto-char (or (match-beginning 2) (match-end 1)))
226 ;; Finish with point after first type specifier.
227 (goto-char (match-end 1))
228 ;; Fontify as a variable name.
229 (1 font-lock-variable-name-face)))
230 ;;
231 ;; Object references and their declarations.
232 '("\\<\\(ref\\)\\>[ \t]*\\((\\(\\sw+\\))\\)?"
233 (3 font-lock-function-name-face nil t)
234 (font-lock-match-c-style-declaration-item-and-skip-to-next nil nil
235 (1 font-lock-variable-name-face)))
236 ))
237 "Gaudy level highlighting for Simula mode.")
238
239 (defvar simula-font-lock-keywords simula-font-lock-keywords-1
240 "Default expressions to highlight in Simula mode.")
241
242 ; The following function is taken from cc-mode.el,
243 ; it determines the flavor of the Emacs running
244
245 (defvar simula-mode-menu
246 '(["Report Bug" simula-submit-bug-report t]
247 ["Indent Line" simula-indent-line t]
248 ["Backward Statement" simula-previous-statement t]
249 ["Forward Statement" simula-next-statement t]
250 ["Backward Up Level" simula-backward-up-level t]
251 ["Forward Down Statement" simula-forward-down-level t])
252 "Lucid Emacs menu for SIMULA mode.")
253
254 (if simula-mode-syntax-table
255 ()
256 (setq simula-mode-syntax-table (copy-syntax-table (standard-syntax-table)))
257 (modify-syntax-entry ?! "<" simula-mode-syntax-table)
258 (modify-syntax-entry ?$ "." simula-mode-syntax-table)
259 (modify-syntax-entry ?% "< b" simula-mode-syntax-table)
260 (modify-syntax-entry ?\n "> b" simula-mode-syntax-table)
261 (modify-syntax-entry ?' "\"" simula-mode-syntax-table)
262 (modify-syntax-entry ?\( "()" simula-mode-syntax-table)
263 (modify-syntax-entry ?\) ")(" simula-mode-syntax-table)
264 (modify-syntax-entry ?\; ">" simula-mode-syntax-table)
265 (modify-syntax-entry ?\[ "." simula-mode-syntax-table)
266 (modify-syntax-entry ?\\ "." simula-mode-syntax-table)
267 (modify-syntax-entry ?\] "." simula-mode-syntax-table)
268 (modify-syntax-entry ?_ "_" simula-mode-syntax-table)
269 (modify-syntax-entry ?\| "." simula-mode-syntax-table)
270 (modify-syntax-entry ?\{ "." simula-mode-syntax-table)
271 (modify-syntax-entry ?\} "." simula-mode-syntax-table))
272
273 (defvar simula-mode-map
274 (let ((map (make-sparse-keymap)))
275 (define-key map "\C-c\C-u" 'simula-backward-up-level)
276 (define-key map "\C-c\C-p" 'simula-previous-statement)
277 (define-key map "\C-c\C-d" 'simula-forward-down-level)
278 (define-key map "\C-c\C-n" 'simula-next-statement)
279 ;; (define-key map "\C-c\C-g" 'simula-goto-definition)
280 ;; (define-key map "\C-c\C-h" 'simula-standard-help)
281 (define-key map "\177" 'backward-delete-char-untabify)
282 (define-key map ":" 'simula-electric-label)
283 (define-key map "\e\C-q" 'simula-indent-exp)
284 (define-key map "\t" 'simula-indent-command)
285 ;; Emacs 19 defines menus in the mode map
286 (define-key map [menu-bar simula]
287 (cons "SIMULA" (make-sparse-keymap "SIMULA")))
288 (define-key map [menu-bar simula bug-report]
289 '("Submit Bug Report" . simula-submit-bug-report))
290 (define-key map [menu-bar simula separator-indent]
291 '("--"))
292 (define-key map [menu-bar simula indent-exp]
293 '("Indent Expression" . simula-indent-exp))
294 (define-key map [menu-bar simula indent-line]
295 '("Indent Line" . simula-indent-command))
296 (define-key map [menu-bar simula separator-navigate]
297 '("--"))
298 (define-key map [menu-bar simula backward-stmt]
299 '("Previous Statement" . simula-previous-statement))
300 (define-key map [menu-bar simula forward-stmt]
301 '("Next Statement" . simula-next-statement))
302 (define-key map [menu-bar simula backward-up]
303 '("Backward Up Level" . simula-backward-up-level))
304 (define-key map [menu-bar simula forward-down]
305 '("Forward Down Statement" . simula-forward-down-level))
306
307 (put 'simula-next-statement 'menu-enable '(not (eobp)))
308 (put 'simula-previous-statement 'menu-enable '(not (bobp)))
309 (put 'simula-forward-down-level 'menu-enable '(not (eobp)))
310 (put 'simula-backward-up-level 'menu-enable '(not (bobp)))
311 (put 'simula-indent-command 'menu-enable '(not buffer-read-only))
312 (put 'simula-indent-exp 'menu-enable '(not buffer-read-only))
313
314 ;; RMS: mouse-3 should not select this menu. mouse-3's global
315 ;; definition is useful in SIMULA mode and we should not interfere
316 ;; with that. The menu is mainly for beginners, and for them,
317 ;; the menubar requires less memory than a special click.
318 ;; in Lucid Emacs, we want the menu to popup when the 3rd button is
319 ;; hit. In 19.10 and beyond this is done automatically if we put
320 ;; the menu on mode-popup-menu variable, see c-common-init [cc-mode.el]
321 ;;(if (not (boundp 'mode-popup-menu))
322 ;; (define-key simula-mode-map 'button3 'simula-popup-menu))
323 map)
324 "Keymap used in `simula-mode'.")
325
326 ;; menus for Lucid
327 (defun simula-popup-menu (e)
328 "Pops up the SIMULA menu."
329 (interactive "@e")
330 (popup-menu (cons (concat mode-name " Mode Commands") simula-mode-menu)))
331
332 ;;;###autoload
333 (define-derived-mode simula-mode nil "Simula"
334 "Major mode for editing SIMULA code.
335 \\{simula-mode-map}
336 Variables controlling indentation style:
337 `simula-tab-always-indent'
338 Non-nil means TAB in SIMULA mode should always reindent the current line,
339 regardless of where in the line point is when the TAB command is used.
340 `simula-indent-level'
341 Indentation of SIMULA statements with respect to containing block.
342 `simula-substatement-offset'
343 Extra indentation after DO, THEN, ELSE, WHEN and OTHERWISE.
344 `simula-continued-statement-offset' 3
345 Extra indentation for lines not starting a statement or substatement,
346 e.g. a nested FOR-loop. If value is a list, each line in a multiple-
347 line continued statement will have the car of the list extra indentation
348 with respect to the previous line of the statement.
349 `simula-label-offset' -4711
350 Offset of SIMULA label lines relative to usual indentation.
351 `simula-if-indent' '(0 . 0)
352 Extra indentation of THEN and ELSE with respect to the starting IF.
353 Value is a cons cell, the car is extra THEN indentation and the cdr
354 extra ELSE indentation. IF after ELSE is indented as the starting IF.
355 `simula-inspect-indent' '(0 . 0)
356 Extra indentation of WHEN and OTHERWISE with respect to the
357 corresponding INSPECT. Value is a cons cell, the car is
358 extra WHEN indentation and the cdr extra OTHERWISE indentation.
359 `simula-electric-indent' nil
360 If this variable is non-nil, `simula-indent-line'
361 will check the previous line to see if it has to be reindented.
362 `simula-abbrev-keyword' 'upcase
363 Determine how SIMULA keywords will be expanded. Value is one of
364 the symbols `upcase', `downcase', `capitalize', (as in) `abbrev-table',
365 or nil if they should not be changed.
366 `simula-abbrev-stdproc' 'abbrev-table
367 Determine how standard SIMULA procedure and class names will be
368 expanded. Value is one of the symbols `upcase', `downcase', `capitalize',
369 (as in) `abbrev-table', or nil if they should not be changed.
370
371 Turning on SIMULA mode calls the value of the variable simula-mode-hook
372 with no arguments, if that value is non-nil."
373 (make-local-variable 'comment-column)
374 (setq comment-column 40)
375 ; (make-local-variable 'end-comment-column)
376 ; (setq end-comment-column 75)
377 (make-local-variable 'paragraph-start)
378 (setq paragraph-start "[ \t]*$\\|\\f")
379 (make-local-variable 'paragraph-separate)
380 (setq paragraph-separate paragraph-start)
381 (make-local-variable 'indent-line-function)
382 (setq indent-line-function 'simula-indent-line)
383 (make-local-variable 'require-final-newline)
384 (setq require-final-newline mode-require-final-newline)
385 (make-local-variable 'comment-start)
386 (setq comment-start "! ")
387 (make-local-variable 'comment-end)
388 (setq comment-end " ;")
389 (make-local-variable 'comment-start-skip)
390 (setq comment-start-skip "!+ *")
391 (make-local-variable 'parse-sexp-ignore-comments)
392 (setq parse-sexp-ignore-comments nil)
393 (make-local-variable 'comment-multi-line)
394 (setq comment-multi-line t)
395 (make-local-variable 'font-lock-defaults)
396 (setq font-lock-defaults
397 '((simula-font-lock-keywords simula-font-lock-keywords-1
398 simula-font-lock-keywords-2 simula-font-lock-keywords-3)
399 nil t ((?_ . "w")) nil
400 (font-lock-syntactic-keywords . simula-font-lock-syntactic-keywords)))
401 (abbrev-mode 1))
402
403 (defun simula-indent-exp ()
404 "Indent SIMULA expression following point."
405 (interactive)
406 (let ((here (point))
407 (simula-electric-indent nil)
408 end)
409 (simula-skip-comment-forward)
410 (if (eobp)
411 (goto-char here)
412 (unwind-protect
413 (progn
414 (simula-next-statement 1)
415 (setq end (point-marker))
416 (simula-previous-statement 1)
417 (beginning-of-line)
418 (while (< (point) end)
419 (if (not (looking-at "[ \t]*$"))
420 (simula-indent-line))
421 (forward-line 1)))
422 (and end (set-marker end nil))))))
423
424
425 (defun simula-indent-line ()
426 "Indent this line as SIMULA code.
427 If `simula-electric-indent' is non-nil, indent previous line if necessary."
428 (let ((origin (- (point-max) (point)))
429 (indent (simula-calculate-indent))
430 (case-fold-search t))
431 (unwind-protect
432 (if simula-electric-indent
433 (progn
434 ;;
435 ;; manually expand abbrev on last line, if any
436 ;;
437 (end-of-line 0)
438 (expand-abbrev)
439 ;; now maybe we should reindent that line
440 (beginning-of-line)
441 (skip-chars-forward " \t\f")
442 (if (and
443 (looking-at
444 "\\(end\\|if\\|then\\|else\\|when\\|otherwise\\)\\>")
445 (not (simula-context)))
446 ;; yes - reindent
447 (let ((post-indent (simula-calculate-indent)))
448 (if (eq (current-indentation) post-indent)
449 ()
450 (delete-horizontal-space)
451 (indent-to post-indent))))))
452 (goto-char (- (point-max) origin))
453 (if (eq (current-indentation) indent)
454 (back-to-indentation)
455 (delete-horizontal-space)
456 (indent-to indent)))))
457
458
459 (defun simula-indent-command (&optional whole-exp)
460 "Indent current line as SIMULA code, or insert TAB character.
461 If `simula-tab-always-indent' is non-nil, always indent current line.
462 Otherwise, indent only if point is before any non-whitespace
463 character on the line.
464
465 A numeric argument, regardless of its value, means indent rigidly
466 all the lines of the SIMULA statement after point so that this line
467 becomes properly indented.
468 The relative indentation among the lines of the statement are preserved."
469 (interactive "P")
470 (let ((case-fold-search t))
471 (if (or whole-exp simula-tab-always-indent
472 (save-excursion
473 (skip-chars-backward " \t\f")
474 (bolp)))
475 ;; reindent current line
476 (let ((indent (save-excursion
477 (beginning-of-line)
478 (simula-calculate-indent)))
479 (current (current-indentation))
480 (origin (- (point-max) (point)))
481 (bol (save-excursion
482 (skip-chars-backward " \t\f")
483 (bolp)))
484 beg end)
485 (unwind-protect
486 (if (eq current indent)
487 (if (save-excursion
488 (skip-chars-backward " \t\f")
489 (bolp))
490 (back-to-indentation))
491 (beginning-of-line)
492 (delete-horizontal-space)
493 (indent-to indent))
494 (if (not bol)
495 (goto-char (- (point-max) origin))))
496 (setq origin (point))
497 (if whole-exp
498 (save-excursion
499 (beginning-of-line 2)
500 (setq beg (point))
501 (goto-char origin)
502 (simula-next-statement 1)
503 (setq end (point))
504 (if (and (> end beg) (not (eq indent current)))
505 (indent-code-rigidly beg end (- indent current) "%")))))
506 (insert-tab))))
507
508
509 (defun simula-context ()
510 "Return value according to syntactic SIMULA context of point.
511 0 point inside COMMENT comment
512 1 point on SIMULA-compiler directive line
513 2 point inside END comment
514 3 point inside string
515 4 point inside character constant
516 nil otherwise."
517 ;; first, find out if this is a compiler directive line
518 (if (save-excursion
519 (beginning-of-line)
520 (eq (following-char) ?%))
521 ;; YES - return 1
522 1
523 (save-excursion
524 ;; The current line is NOT a compiler directive line.
525 ;; Now, the strategy is to search backward to find a semicolon
526 ;; that is NOT inside a string. The point after semicolon MUST be
527 ;; outside a comment, since semicolons are comment-ending and
528 ;; comments are non-recursive. We take advantage of the fact
529 ;; that strings MUST end on the same line as they started, so
530 ;; that we can easily decide whether we are inside a string or not.
531 (let (return-value (origin (point)))
532 (skip-chars-backward "^;" (point-min))
533 ;; found semicolon or beginning of buffer
534 (let (loopvalue (saved-point origin))
535 (while (and (not (bobp))
536 (if (progn
537 (beginning-of-line)
538 ;; compiler directive line? If so, cont searching..
539 (eq (following-char) ?%))
540 t
541 (while (< (point) saved-point)
542 (skip-chars-forward "^;\"'")
543 (forward-char 1)
544 (cond
545 ((eq (preceding-char) ?\;)
546 (setq saved-point (point)))
547 ((eq (preceding-char) ?\")
548 (skip-chars-forward "^\";")
549 (if (eq (following-char) ?\;)
550 (setq saved-point (point) loopvalue t)
551 (forward-char 1)))
552 (t
553 (if (eq (following-char) ?')
554 (forward-char 1))
555 (skip-chars-forward "^';")
556 (if (eq (following-char) ?\;)
557 (setq saved-point (point) loopvalue t)
558 (forward-char 1)))))
559 loopvalue))
560 (backward-char 1)
561 (skip-chars-backward "^;")
562 (setq saved-point (point) loopvalue nil)))
563 ;; Now we are CERTAIN that we are outside comments and strings.
564 ;; The job now is to search forward again towards the origin
565 ;; skipping directives, comments and strings correctly,
566 ;; so that we know what context we are in when we find the origin.
567 (while (and
568 (< (point) origin)
569 (re-search-forward
570 "\\<end\\>\\|!\\|\"\\|'\\|^%\\|\\<comment\\>" origin 'move))
571 (cond
572 ((memq (preceding-char) '(?d ?D))
573 (setq return-value 2)
574 (while (and (re-search-forward
575 ";\\|\\<end\\>\\|\\<else\\>\\|\\<otherwise\\>\\|\\<when\\>\\|^%"
576 origin 'move)
577 ;; found another END?
578 (or (memq (preceding-char) '(?d ?D))
579 ;; if directive, skip line
580 (and (eq (preceding-char) ?%)
581 (beginning-of-line 2))
582 ;; found other keyword, out of END comment
583 (setq return-value nil))))
584 (if (and (eq (char-syntax (preceding-char)) ?w)
585 (eq (char-syntax (following-char)) ?w))
586 (save-excursion
587 (backward-word 1)
588 (if (looking-at "end\\>\\|else\\>\\|otherwise\\>\\|when\\>")
589 (setq return-value nil)))))
590 ((memq (preceding-char) '(?! ?t ?T))
591 ; skip comment
592 (setq return-value 0)
593 (skip-chars-forward "^%;" origin)
594 (while (and return-value (< (point) origin))
595 (if (eq (following-char) ?\;)
596 (setq return-value nil)
597 (if (bolp)
598 (beginning-of-line 2) ; skip directive inside comment
599 (forward-char 1)) ; or single '%'
600 (skip-chars-forward "^%;" origin))))
601 ((eq (preceding-char) ?\")
602 (if (not (search-forward "\"" origin 'move))
603 (setq return-value 3)))
604 ((eq (preceding-char) ?\')
605 (if (or (eq (point) origin) (eobp))
606 (setq return-value 4)
607 (forward-char 1)
608 (if (not (search-forward "'" origin 'move))
609 (setq return-value 4))))
610 ;; compiler directive line - skip
611 (t (beginning-of-line 2))))
612 return-value)
613 )))
614
615
616 (defun simula-electric-label ()
617 "If this is a label that starts the line, reindent the line."
618 (interactive)
619 (expand-abbrev)
620 (insert ?:)
621 (let ((origin (- (point-max) (point)))
622 (case-fold-search t)
623 ;; don't mix a label with an assignment operator := :-
624 ;; therefore take a peek at next typed character...
625 (next-char (read-event)))
626 (unwind-protect
627 (setq unread-command-events (append unread-command-events
628 (list next-char)))
629 ;; Problem: find out if character just read is a command char
630 ;; that would insert something after ':' making it a label.
631 ;; At least \n, \r (and maybe \t) falls into this category.
632 ;; This is a real crock, it depends on traditional keymap
633 ;; bindings, that is, printing characters doing self-insert,
634 ;; and no other command sequence inserting '-' or '='.
635 ;; simula-electric-label can be easily fooled...
636 (if (and (not (memq next-char '(?= ?-)))
637 (or (memq next-char '(?\n ?\r))
638 (and (eq next-char ?\t)
639 simula-tab-always-indent)
640 (not (memq (following-char) '(?= ?-))))
641 (not (simula-context))
642 ;; label?
643 (progn
644 (backward-char 1)
645 (skip-chars-backward " \t\f")
646 (skip-chars-backward "a-zA-Z0-9_")
647 (if (looking-at "virtual\\>")
648 nil
649 (skip-chars-backward " \t\f")
650 (bolp))))
651 (let ((amount (simula-calculate-indent)))
652 (delete-horizontal-space)
653 (indent-to amount)))
654 (goto-char (- (point-max) origin)))))
655
656
657 (defun simula-backward-up-level (count)
658 "Move backward up COUNT block levels.
659 If COUNT is negative, move forward up block level instead."
660 (interactive "p")
661 (let ((origin (point))
662 (case-fold-search t))
663 (condition-case ()
664 (if (> count 0)
665 (while (> count 0)
666 (re-search-backward "\\<begin\\>\\|\\<end\\>")
667 (if (not (simula-context))
668 (setq count (if (memq (following-char) '(?b ?B))
669 (1- count)
670 (1+ count)))))
671 (while (< count 0)
672 (re-search-forward "\\<begin\\>\\|\\<end\\>")
673 (backward-word 1)
674 (if (not (simula-context))
675 (setq count (if (memq (following-char) '(?e ?E))
676 (1+ count)
677 (1- count))))
678 (backward-word -1)))
679 ;; If block level not found, jump back to origin and signal an error
680 (error (progn
681 (goto-char origin)
682 (error "No higher block level")))
683 (quit (progn
684 (goto-char origin)
685 (signal 'quit nil))))))
686
687
688 (defun simula-forward-down-level (count)
689 "Move forward down COUNT block levels.
690 If COUNT is negative, move backward down block level instead."
691 (interactive "p")
692 ;; When we search for a deeper block level, we must never
693 ;; get out of the block where we started -> count >= start-count
694 (let ((start-count count)
695 (origin (point))
696 (case-fold-search t))
697 (condition-case ()
698 (if (< count 0)
699 (while (< count 0)
700 (re-search-backward "\\<begin\\>\\|\\<end\\>")
701 (if (not (simula-context))
702 (setq count (if (memq (following-char) '(?e ?E))
703 (1+ count)
704 (1- count))))
705 (if (< count start-count) (signal 'error nil)))
706 (while (> count 0)
707 (re-search-forward "\\<begin\\>\\|\\<end\\>")
708 (backward-word 1)
709 (if (not (simula-context))
710 (setq count (if (memq (following-char) '(?b ?B))
711 (1- count)
712 (1+ count))))
713 (backward-word -1)
714 ;; deeper level has to be found within starting block
715 (if (> count start-count) (signal 'error nil))))
716 ;; If block level not found, jump back to origin and signal an error
717 (error (progn
718 (goto-char origin)
719 (error "No containing block level")))
720 (quit (progn
721 (goto-char origin)
722 (signal 'quit nil))))))
723
724
725 (defun simula-previous-statement (count)
726 "Move backward COUNT statements.
727 If COUNT is negative, move forward instead."
728 (interactive "p")
729 (if (< count 0)
730 (simula-next-statement (- count))
731 (let (status
732 (case-fold-search t)
733 (origin (point)))
734 (condition-case ()
735 ;;
736 (progn
737 (simula-skip-comment-backward)
738 (if (memq (preceding-char) '(?n ?N))
739 (progn
740 (backward-word 1)
741 (if (not (looking-at "\\<begin\\>"))
742 (backward-word -1)))
743 (if (eq (preceding-char) ?\;)
744 (backward-char 1))
745 )
746 (while (and (natnump (setq count (1- count)))
747 (setq status (simula-search-backward
748 ";\\|\\<begin\\>" nil 'move))))
749 (if status
750 (progn
751 (if (eq (following-char) ?\;)
752 (forward-char 1)
753 (backward-word -1))))
754 (simula-skip-comment-forward))
755 (error (progn (goto-char origin)
756 (error "Incomplete statement (too many ENDs)")))
757 (quit (progn (goto-char origin) (signal 'quit nil)))))))
758
759
760 (defun simula-next-statement (count)
761 "Move forward COUNT statements.
762 If COUNT is negative, move backward instead."
763 (interactive "p")
764 (if (< count 0)
765 (simula-previous-statement (- count))
766 (let (status
767 (case-fold-search t)
768 (origin (point)))
769 (condition-case ()
770 (progn
771 (simula-skip-comment-forward)
772 (if (looking-at "\\<end\\>") (forward-word 1))
773 (while (and (natnump (setq count (1- count)))
774 (setq status (simula-search-forward
775 ";\\|\\<end\\>" (point-max) 'move))))
776 (if (and status (/= (preceding-char) ?\;))
777 (progn
778 (backward-word 1)
779 (simula-skip-comment-backward))))
780 (error (progn (goto-char origin)
781 (error "Incomplete statement (too few ENDs)")))
782 (quit (progn (goto-char origin) (signal 'quit nil)))))))
783
784
785 (defun simula-skip-comment-backward (&optional stop-at-end)
786 "Search towards bob to find first char that is outside a comment."
787 (interactive)
788 (catch 'simula-out
789 (let (context)
790 (while t
791 (skip-chars-backward " \t\n\f")
792 (if (eq (preceding-char) ?\;)
793 (save-excursion
794 (backward-char 1)
795 (setq context (simula-context))
796 (if (and stop-at-end (eq context 2))
797 (setq context nil)))
798 (setq context (simula-context)))
799 (cond
800 ((memq context '(nil 3 4))
801 ;; check to see if we found a label
802 (if (and (eq (preceding-char) ?:)
803 (not (memq (following-char) '(?- ?=)))
804 (save-excursion
805 (skip-chars-backward ": \t\fa-zA-Z0-9_")
806 (not (looking-at "virtual\\>"))))
807 (skip-chars-backward ": \t\fa-zA-Z0-9_")
808 (throw 'simula-out nil)))
809 ((eq context 0)
810 ;; since we are inside a comment, it must start somewhere!
811 (while (and (re-search-backward "!\\|\\<comment\\>")
812 (memq (simula-context) '(0 1)))))
813 ((eq context 1)
814 (beginning-of-line)
815 (if (bobp)
816 (throw 'simula-out nil)
817 (backward-char)))
818 ((eq context 2)
819 ;; an END-comment must belong to an END
820 (re-search-backward "\\<end\\>")
821 (forward-word 1)
822 (throw 'simula-out nil))
823 ;; should be impossible to get here..
824 )))))
825
826
827 (defun simula-skip-comment-forward ()
828 "Search towards eob to find first char that is outside a comment."
829 ;; this function assumes we start with point .outside a comment
830 (interactive)
831 (catch 'simula-out
832 (while t
833 (skip-chars-forward " \t\n\f")
834 ;; BUG: the following (0 2) branches don't take into account intermixing
835 ;; directive lines
836 (cond
837 ((looking-at "!\\|\\<comment\\>")
838 (search-forward ";" nil 'move))
839 ((and (bolp) (eq (following-char) ?%))
840 (beginning-of-line 2))
841 ((and (looking-at "[a-z0-9_]*[ \t\f]*:[^-=]")
842 (not (looking-at "virtual\\>")))
843 (skip-chars-forward "a-zA-Z0-9_ \t\f:"))
844 (t
845 (throw 'simula-out t))))))
846
847
848 (defun simula-forward-up-level ()
849 (let ((continue-loop t)
850 (origin (point))
851 (case-fold-search t)
852 return-value
853 temp)
854 (while continue-loop
855 (if (re-search-backward "\\<begin\\>\\|\\<end\\>" (point-min) 'move)
856 (setq temp (simula-context)
857 return-value (and (memq (preceding-char) '(?d ?D))
858 (memq temp '(nil 2)))
859 continue-loop (and (not return-value)
860 (simula-forward-up-level)))
861 (setq continue-loop nil)))
862 (if return-value
863 t
864 (goto-char origin)
865 nil)))
866
867
868 (defun simula-calculate-indent ()
869 (save-excursion
870 (let ((where (simula-context))
871 (origin (point))
872 (indent 0)
873 continued
874 start-line
875 temp
876 found-end
877 prev-cont)
878 (cond
879 ((eq where 0)
880 ;;
881 ;; Comment.
882 ;; If comment started on previous non-blank line, indent to the
883 ;; column where the comment started, else indent as that line.
884 ;;
885 (skip-chars-backward " \t\n\f")
886 (while (and (not (bolp)) (eq (simula-context) 0))
887 (re-search-backward "^\\|!\\|\\<comment\\>"))
888 (skip-chars-forward " \t\n\f")
889 (prog1
890 (current-column)
891 (goto-char origin)))
892 ((eq where 1)
893 ;;
894 ;; Directive. Always 0.
895 ;;
896 0)
897 ;;
898 ;; Detect missing string delimiters
899 ;;
900 ((eq where 3)
901 (error "Inside string"))
902 ((eq where 4)
903 (error "Inside character constant"))
904 ;;
905 ;; check to see if inside ()'s
906 ;;
907 ((setq temp (simula-inside-parens))
908 temp)
909 ;;
910 ;; Calculate non-comment indentation
911 (t
912 ;; first, find out if this line starts with something that needs
913 ;; special indentation (END/IF/THEN/ELSE/WHEN/OTHERWISE or label)
914 ;;
915 (skip-chars-forward " \t\f")
916 (cond
917 ;;
918 ;; END
919 ;;
920 ((looking-at "end\\>")
921 (setq indent (- simula-indent-level)
922 found-end t))
923 ;;
924 ;; IF/THEN/ELSE
925 ;;
926 ((looking-at "if\\>\\|then\\>\\|else\\>")
927 ;; search for the *starting* IF
928 (cond
929 ((memq (following-char) '(?T ?t))
930 (setq indent (car simula-if-indent)))
931 ((memq (following-char) '(?E ?e))
932 (setq indent (cdr simula-if-indent)))
933 (t
934 (forward-word 1)
935 (setq indent 0)))
936 (simula-find-if))
937 ;;
938 ;; WHEN/OTHERWISE
939 ;;
940 ((looking-at "when\\>\\|otherwise\\>")
941 ;; search for corresponding INSPECT
942 (if (memq (following-char) '(?W ?w))
943 (setq indent (car simula-inspect-indent))
944 (setq indent (cdr simula-inspect-indent)))
945 (simula-find-inspect))
946 ;;
947 ;; label:
948 ;;
949 ((and (not (looking-at "virtual\\>"))
950 (looking-at "[a-z0-9_]*[ \t\f]*:[^-=]"))
951 (setq indent simula-label-offset)))
952 ;; find line with non-comment text
953 (simula-skip-comment-backward 'dont-skip-end)
954 (if (and found-end
955 (not (eq (preceding-char) ?\;))
956 (if (memq (preceding-char) '(?N ?n))
957 (save-excursion
958 (backward-word 1)
959 (not (looking-at "begin\\>")))
960 t))
961 (progn
962 (simula-previous-statement 1)
963 (simula-skip-comment-backward)))
964 (setq start-line
965 (save-excursion (beginning-of-line) (point))
966 ;; - perhaps this is a continued statement
967 continued
968 (save-excursion
969 (and (not (bobp))
970 ;; (not found-end)
971 (if (eq (char-syntax (preceding-char)) ?w)
972 (progn
973 (backward-word 1)
974 (not (looking-at
975 "begin\\|then\\|else\\|when\\|otherwise\\|do"
976 )))
977 (not (memq (preceding-char) '(?: ?\;)))))))
978 ;;
979 ;; MAIN calculation loop - count BEGIN/DO etc.
980 ;;
981 (while (not (bolp))
982 (if (re-search-backward
983 ";\\|\\<\\(begin\\|end\\|if\\|else\\|then\\|when\\|otherwise\\|do\\)\\>"
984 start-line 'move)
985 (if (simula-context)
986 ();; found something in a comment/string - ignore
987 (setq temp (following-char))
988 (cond
989 ((eq temp ?\;)
990 (simula-previous-statement 1))
991 ((looking-at "begin\\>")
992 (setq indent (+ indent simula-indent-level)))
993 ((looking-at "end\\>")
994 (forward-word 1)
995 (simula-previous-statement 1))
996 ((looking-at "do\\>")
997 (setq indent (+ indent simula-substatement-offset))
998 (simula-find-do-match))
999 ((looking-at "\\(if\\|then\\|else\\)\\>")
1000 (if (memq temp '(?I ?i))
1001 (forward-word 1)
1002 (setq indent (+ indent
1003 simula-substatement-offset
1004 (if (memq temp '(?T ?t))
1005 (car simula-if-indent)
1006 (cdr simula-if-indent)))))
1007 (simula-find-if))
1008 ((looking-at "\\<when\\>\\|\\<otherwise\\>")
1009 (setq indent (+ indent
1010 simula-substatement-offset
1011 (if (memq temp '(?W ?w))
1012 (car simula-if-indent)
1013 (cdr simula-if-indent))))
1014 (simula-find-inspect)))
1015 ;; found the start of a [sub]statement
1016 ;; add indentation for continued statement
1017 (if continued
1018 (setq indent
1019 (+ indent
1020 (if (listp simula-continued-statement-offset)
1021 (car simula-continued-statement-offset)
1022 simula-continued-statement-offset))))
1023 (setq start-line
1024 (save-excursion (beginning-of-line) (point))
1025 continued nil))
1026 ;; search failed .. point is at beginning of line
1027 ;; determine if we should continue searching
1028 ;; (at or before comment or label)
1029 ;; temp = t means finished
1030 (setq temp
1031 (and (not (simula-context))
1032 (save-excursion
1033 (skip-chars-forward " \t\f")
1034 (or (looking-at "virtual")
1035 (not
1036 (looking-at
1037 "!\\|comment\\>\\|[a-z0-9_]*[ \t\f]*:[^-=]")))))
1038 prev-cont continued)
1039 ;; if we are finished, find current line's indentation
1040 (if temp
1041 (setq indent (+ indent (current-indentation))))
1042 ;; find next line with non-comment SIMULA text
1043 ;; maybe indent extra if statement continues
1044 (simula-skip-comment-backward)
1045 (setq continued
1046 (and (not (bobp))
1047 (if (eq (char-syntax (preceding-char)) ?w)
1048 (save-excursion
1049 (backward-word 1)
1050 (not (looking-at
1051 "begin\\|then\\|else\\|when\\|otherwise\\|do")))
1052 (not (memq (preceding-char) '(?: ?\;))))))
1053 ;; if we the state of the continued-variable
1054 ;; changed, add indentation for continued statement
1055 (if (or (and prev-cont (not continued))
1056 (and continued
1057 (listp simula-continued-statement-offset)))
1058 (setq indent
1059 (+ indent
1060 (if (listp simula-continued-statement-offset)
1061 (car simula-continued-statement-offset)
1062 simula-continued-statement-offset))))
1063 ;; while ends if point is at beginning of line at loop test
1064 (if (not temp)
1065 (setq start-line (save-excursion (beginning-of-line) (point)))
1066 (beginning-of-line))))
1067 ;;
1068 ;; return indentation
1069 ;;
1070 indent)))))
1071
1072
1073 (defun simula-find-if ()
1074 "Find starting IF of a IF-THEN[-ELSE[-IF-THEN...]] statement."
1075 (catch 'simula-out
1076 (while t
1077 (if (and (simula-search-backward "\\<if\\>\\|;\\|\\<begin\\>"nil t)
1078 (memq (following-char) '(?I ?i)))
1079 (save-excursion
1080 ;;
1081 ;; find out if this IF was really the start of the IF statement
1082 ;;
1083 (simula-skip-comment-backward)
1084 (if (and (eq (char-syntax (preceding-char)) ?w)
1085 (progn
1086 (backward-word 1)
1087 (looking-at "else\\>")))
1088 ()
1089 (throw 'simula-out t)))
1090 (if (not (looking-at "\\<if\\>"))
1091 (error "Missing IF or misplaced BEGIN or ';' (can't find IF)")
1092 ;;
1093 ;; we were at the starting IF in the first place..
1094 ;;
1095 (throw 'simula-out t))))))
1096
1097
1098 (defun simula-find-inspect ()
1099 "Find INSPECT matching WHEN or OTHERWISE."
1100 (catch 'simula-out
1101 (let ((level 0))
1102 ;;
1103 ;; INSPECTs can be nested, have to find the corresponding one
1104 ;;
1105 (while t
1106 (if (and (simula-search-backward "\\<inspect\\>\\|\\<otherwise\\>\\|;"
1107 nil t)
1108 (/= (following-char) ?\;))
1109 (if (memq (following-char) '(?O ?o))
1110 (setq level (1+ level))
1111 (if (zerop level)
1112 (throw 'simula-out t)
1113 (setq level (1- level))))
1114 (error "Missing INSPECT or misplaced ';' (can't find INSPECT)"))))))
1115
1116
1117 (defun simula-find-do-match ()
1118 "Find keyword matching DO: FOR, WHILE, INSPECT or WHEN."
1119 (while (and (re-search-backward
1120 "\\<\\(do\\|for\\|while\\|inspect\\|when\\|end\\|begin\\)\\>\\|;"
1121 nil 'move)
1122 (simula-context)))
1123 (if (and (looking-at "\\<\\(for\\|while\\|inspect\\|when\\)\\>")
1124 (not (simula-context)))
1125 () ;; found match
1126 (error "No matching FOR, WHILE or INSPECT for DO, or misplaced ';'")))
1127
1128
1129 (defun simula-inside-parens ()
1130 "Return position after `(' on line if inside parentheses, nil otherwise."
1131 (save-excursion
1132 (let ((parlevel 0))
1133 (catch 'simula-out
1134 (while t
1135 (if (re-search-backward "(\\|)\\|;" nil t)
1136 (if (eq (simula-context) nil)
1137 ;; found something - check it out
1138 (cond
1139 ((eq (following-char) ?\;)
1140 (if (zerop parlevel)
1141 (throw 'simula-out nil)
1142 (error "Parenthesis mismatch or misplaced ';'")))
1143 ((eq (following-char) ?\()
1144 (if (zerop parlevel)
1145 (throw 'simula-out (1+ (current-column)))
1146 (setq parlevel (1- parlevel))))
1147 (t (setq parlevel (1+ parlevel))))
1148 );; nothing - inside comment or string
1149 ;; search failed
1150 (throw 'simula-out nil)))))))
1151
1152
1153 (defun simula-goto-definition ()
1154 "Goto point of definition of variable, procedure or class."
1155 (interactive))
1156
1157
1158 (defun simula-expand-stdproc ()
1159 (if (or (not simula-abbrev-stdproc) (simula-context))
1160 (unexpand-abbrev)
1161 (cond
1162 ((eq simula-abbrev-stdproc 'upcase) (upcase-word -1))
1163 ((eq simula-abbrev-stdproc 'downcase) (downcase-word -1))
1164 ((eq simula-abbrev-stdproc 'capitalize) (capitalize-word -1))
1165 ((eq simula-abbrev-stdproc 'abbrev-table)
1166 ;; If not in lowercase, expansions are always capitalized.
1167 ;; We then want to replace with the exact expansion.
1168 (if (equal (symbol-name last-abbrev) last-abbrev-text)
1169 ()
1170 (downcase-word -1)
1171 (expand-abbrev))))))
1172
1173
1174 (defun simula-expand-keyword ()
1175 (if (or (not simula-abbrev-keyword) (simula-context))
1176 (unexpand-abbrev)
1177 (cond
1178 ((eq simula-abbrev-keyword 'upcase) (upcase-word -1))
1179 ((eq simula-abbrev-keyword 'downcase) (downcase-word -1))
1180 ((eq simula-abbrev-keyword 'capitalize) (capitalize-word -1))
1181 ((eq simula-abbrev-stdproc 'abbrev-table)
1182 (if (equal (symbol-name last-abbrev) last-abbrev-text)
1183 ()
1184 (downcase-word -1)
1185 (expand-abbrev))))))
1186
1187
1188 (defun simula-electric-keyword ()
1189 "Expand SIMULA keyword. If it starts the line, reindent."
1190 ;; redisplay
1191 (let ((show-char (eq this-command 'self-insert-command)))
1192 ;; If the abbrev expansion results in reindentation, the user may have
1193 ;; to wait some time before the character he typed is displayed
1194 ;; (the char causing the expansion is inserted AFTER the hook function
1195 ;; is called). This is annoying in case of normal characters.
1196 ;; However, if the user pressed a key bound to newline, it is better
1197 ;; to have the line inserted after the begin-end match.
1198 (if show-char
1199 (progn
1200 (insert-char last-command-event 1)
1201 (sit-for 0)
1202 (backward-char 1)))
1203 (if (let ((where (simula-context))
1204 (case-fold-search t))
1205 (if where
1206 (if (and (eq where 2) (eq (char-syntax (preceding-char)) ?w))
1207 (save-excursion
1208 (backward-word 1)
1209 (not (looking-at "end\\>"))))))
1210 (unexpand-abbrev)
1211 (cond
1212 ((not simula-abbrev-keyword) (unexpand-abbrev))
1213 ((eq simula-abbrev-keyword 'upcase) (upcase-word -1))
1214 ((eq simula-abbrev-keyword 'downcase) (downcase-word -1))
1215 ((eq simula-abbrev-keyword 'capitalize) (capitalize-word -1)))
1216 (let ((pos (- (point-max) (point)))
1217 (case-fold-search t)
1218 null)
1219 (condition-case null
1220 (progn
1221 ;; check if the expanded word is on the beginning of the line.
1222 (if (and (eq (char-syntax (preceding-char)) ?w)
1223 (progn
1224 (backward-word 1)
1225 (if (looking-at "end\\>")
1226 (save-excursion
1227 (simula-backward-up-level 1)
1228 (if (pos-visible-in-window-p)
1229 (sit-for 1)
1230 (message "Matches %s"
1231 (buffer-substring
1232 (point)
1233 (+ (point) (window-width)))))))
1234 (skip-chars-backward " \t\f")
1235 (bolp)))
1236 (let ((indent (simula-calculate-indent)))
1237 (if (eq indent (current-indentation))
1238 ()
1239 (delete-horizontal-space)
1240 (indent-to indent)))
1241 (skip-chars-forward " \t\f"))
1242 ;; check for END - blow whistles and ring bells
1243
1244 (goto-char (- (point-max) pos))
1245 (if show-char
1246 (delete-char 1)))
1247 (quit (goto-char (- (point-max) pos))))))))
1248
1249
1250 (defun simula-search-backward (regexp &optional bound noerror)
1251 "Search backward from point for regular expression REGEXP,
1252 ignoring matches found inside SIMULA comments, string literals,
1253 and BEGIN..END blocks.
1254 Set point to the end of the occurrence found, and return point.
1255 An optional second argument BOUND bounds the search, it is a buffer position.
1256 The match found must not extend after that position. Optional third argument
1257 NOERROR, if t, means if fail just return nil (no error).
1258 If not nil and not t, move to limit of search and return nil."
1259 (let (begin end context (comb-regexp (concat regexp "\\|\\<end\\>"))
1260 match (start-point (point)))
1261 (catch 'simula-backward
1262 (while (re-search-backward comb-regexp bound 1)
1263 ;; We have a match, check SIMULA context at match-beginning
1264 ;; to see if we are outside comments etc.
1265 ;; Set MATCH to t if we found a true match,
1266 ;; set MATCH to 'BLOCK if we found a BEGIN..END block,
1267 ;; else set MATCH to nil.
1268 (save-match-data
1269 (setq context (simula-context))
1270 (cond
1271 ((eq context nil)
1272 (setq match (if (looking-at regexp) t 'BLOCK)))
1273 ;; A comment-ending `;' is part of the comment, and shouldn't match.
1274 ;; ((eq context 0)
1275 ;; (setq match (if (eq (following-char) ?\;) t nil)))
1276 ((eq context 2)
1277 (setq match (if (and (looking-at regexp)
1278 (looking-at ";\\|\\<end\\>\\|\\<else\\>\\|\\<otherwise\\>\\|\\<when\\>"))
1279 t
1280 (if (looking-at "\\<end\\>") 'BLOCK nil))))
1281 (t (setq match nil))))
1282 ;; Exit if true match
1283 (if (eq match t) (throw 'simula-backward (point)))
1284 (if (eq match 'BLOCK)
1285 ;; We found the END of a block
1286 (let ((level 0))
1287 (while (natnump level)
1288 (if (re-search-backward "\\<begin\\>\\|\\<end\\>" bound 1)
1289 (let ((context (simula-context)))
1290 ;; We found a BEGIN -> decrease level count
1291 (cond ((and (eq context nil)
1292 (memq (following-char) '(?b ?B)))
1293 (setq level (1- level)))
1294 ;; END -> increase level count
1295 ((and (memq context '(nil 2))
1296 (memq (following-char) '(?e ?E)))
1297 (setq level (1+ level)))))
1298 ;; Block search failed. Action depends on noerror.
1299 (if (or (not noerror) (eq noerror t))
1300 (goto-char start-point))
1301 (if (not noerror)
1302 (signal 'search-failed (list regexp)))
1303 (throw 'simula-backward nil))))))
1304 ;; Search failed. Action depends on noerror.
1305 (if (or (not noerror) (eq noerror t))
1306 (goto-char start-point))
1307 (if noerror
1308 nil
1309 (signal 'search-failed (list regexp))))))
1310
1311
1312 (defun simula-search-forward (regexp &optional bound noerror)
1313 "Search forward from point for regular expression REGEXP,
1314 ignoring matches found inside SIMULA comments, string literals,
1315 and BEGIN..END blocks.
1316 Set point to the end of the occurrence found, and return point.
1317 An optional second argument BOUND bounds the search, it is a buffer position.
1318 The match found must not extend after that position. Optional third argument
1319 NOERROR, if t, means if fail just return nil (no error).
1320 If not nil and not t, move to limit of search and return nil."
1321 (let (begin end context (comb-regexp (concat regexp "\\|\\<begin\\>"))
1322 match (start-point (point)))
1323 (catch 'simula-forward
1324 (while (re-search-forward comb-regexp bound 1)
1325 ;; We have a match, check SIMULA context at match-beginning
1326 ;; to see if we are outside comments.
1327 ;; Set MATCH to t if we found a true match,
1328 ;; set MATCH to 'BLOCK if we found a BEGIN..END block,
1329 ;; else set MATCH to nil.
1330 (save-match-data
1331 (save-excursion
1332 (goto-char (match-beginning 0))
1333 (setq context (simula-context))
1334 (cond
1335 ((not context)
1336 (setq match (if (looking-at regexp) t 'BLOCK)))
1337 ;; Comment-ending `;' is part of the comment, and shouldn't match.
1338 ;; ((eq context 0)
1339 ;; (setq match (if (eq (following-char) ?\;) t nil)))
1340 ((eq context 2)
1341 (setq match (if (and (looking-at regexp)
1342 (looking-at ";\\|\\<end\\>\\|\\<else\\>\\|\\<otherwise\\>\\|\\<when\\>")) t nil)))
1343 (t (setq match nil)))))
1344 ;; Exit if true match
1345 (if (eq match t) (throw 'simula-forward (point)))
1346 (if (eq match 'BLOCK)
1347 ;; We found the BEGINning of a block
1348 (let ((level 0))
1349 (while (natnump level)
1350 (if (re-search-forward "\\<begin\\>\\|\\<end\\>" bound 1)
1351 (let ((context (simula-context)))
1352 ;; We found a BEGIN -> increase level count
1353 (cond ((eq context nil) (setq level (1+ level)))
1354 ;; END -> decrease level count
1355 ((and (eq context 2)
1356 ;; Don't match BEGIN inside END comment
1357 (memq (preceding-char) '(?d ?D)))
1358 (setq level (1- level)))))
1359 ;; Block search failed. Action depends on noerror.
1360 (if (or (not noerror) (eq noerror t))
1361 (goto-char start-point))
1362 (if (not noerror)
1363 (signal 'search-failed (list regexp)))
1364 (throw 'simula-forward nil))))))
1365 ;; Search failed. Action depends on noerror.
1366 (if (or (not noerror) (eq noerror t))
1367 (goto-char start-point))
1368 (if noerror
1369 nil
1370 (signal 'search-failed (list regexp))))))
1371
1372
1373 (defun simula-install-standard-abbrevs ()
1374 "Define Simula keywords, procedures and classes in local abbrev table."
1375 ;; procedure and class names are as of the SIMULA 87 standard.
1376 (interactive)
1377 (dolist (args
1378 '(("abs" "Abs" simula-expand-stdproc)
1379 ("accum" "Accum" simula-expand-stdproc)
1380 ("activate" "ACTIVATE" simula-expand-keyword)
1381 ("addepsilon" "AddEpsilon" simula-expand-stdproc)
1382 ("after" "AFTER" simula-expand-keyword)
1383 ("and" "AND" simula-expand-keyword)
1384 ("arccos" "ArcCos" simula-expand-stdproc)
1385 ("arcsin" "ArcSin" simula-expand-stdproc)
1386 ("arctan" "ArcTan" simula-expand-stdproc)
1387 ("arctan2" "ArcTan2" simula-expand-stdproc)
1388 ("array" "ARRAY" simula-expand-keyword)
1389 ("at" "AT" simula-expand-keyword)
1390 ("before" "BEFORE" simula-expand-keyword)
1391 ("begin" "BEGIN" simula-expand-keyword)
1392 ("blanks" "Blanks" simula-expand-stdproc)
1393 ("boolean" "BOOLEAN" simula-expand-keyword)
1394 ("breakoutimage" "BreakOutImage" simula-expand-stdproc)
1395 ("bytefile" "ByteFile" simula-expand-stdproc)
1396 ("call" "Call" simula-expand-stdproc)
1397 ("cancel" "Cancel" simula-expand-stdproc)
1398 ("cardinal" "Cardinal" simula-expand-stdproc)
1399 ("char" "Char" simula-expand-stdproc)
1400 ("character" "CHARACTER" simula-expand-keyword)
1401 ("checkpoint" "CheckPoint" simula-expand-stdproc)
1402 ("class" "CLASS" simula-expand-keyword)
1403 ("clear" "Clear" simula-expand-stdproc)
1404 ("clocktime" "ClockTime" simula-expand-stdproc)
1405 ("close" "Close" simula-expand-stdproc)
1406 ("comment" "COMMENT" simula-expand-keyword)
1407 ("constant" "Constant" simula-expand-stdproc)
1408 ("copy" "Copy" simula-expand-stdproc)
1409 ("cos" "Cos" simula-expand-stdproc)
1410 ("cosh" "CosH" simula-expand-stdproc)
1411 ("cotan" "CoTan" simula-expand-stdproc)
1412 ("cputime" "CpuTime" simula-expand-stdproc)
1413 ("current" "Current" simula-expand-stdproc)
1414 ("datetime" "DateTime" simula-expand-stdproc)
1415 ("decimalmark" "DecimalMark" simula-expand-stdproc)
1416 ("delay" "DELAY" simula-expand-keyword)
1417 ("deleteimage" "DeleteImage" simula-expand-stdproc)
1418 ("detach" "Detach" simula-expand-stdproc)
1419 ("digit" "Digit" simula-expand-stdproc)
1420 ("directbytefile" "DirectByteFile" simula-expand-stdproc)
1421 ("directfile" "DirectFile" simula-expand-stdproc)
1422 ("discrete" "Discrete" simula-expand-stdproc)
1423 ("do" "DO" simula-expand-keyword)
1424 ("downcase" "Downcase" simula-expand-stdproc)
1425 ("draw" "Draw" simula-expand-stdproc)
1426 ("eject" "Eject" simula-expand-stdproc)
1427 ("else" "ELSE" simula-electric-keyword)
1428 ("empty" "Empty" simula-expand-stdproc)
1429 ("end" "END" simula-electric-keyword)
1430 ("endfile" "Endfile" simula-expand-stdproc)
1431 ("entier" "Entier" simula-expand-stdproc)
1432 ("eq" "EQ" simula-expand-keyword)
1433 ("eqv" "EQV" simula-expand-keyword)
1434 ("erlang" "Erlang" simula-expand-stdproc)
1435 ("error" "Error" simula-expand-stdproc)
1436 ("evtime" "EvTime" simula-expand-stdproc)
1437 ("exp" "Exp" simula-expand-stdproc)
1438 ("external" "EXTERNAL" simula-expand-keyword)
1439 ("false" "FALSE" simula-expand-keyword)
1440 ("field" "Field" simula-expand-stdproc)
1441 ("file" "File" simula-expand-stdproc)
1442 ("first" "First" simula-expand-stdproc)
1443 ("follow" "Follow" simula-expand-stdproc)
1444 ("for" "FOR" simula-expand-keyword)
1445 ("ge" "GE" simula-expand-keyword)
1446 ("getchar" "GetChar" simula-expand-stdproc)
1447 ("getfrac" "GetFrac" simula-expand-stdproc)
1448 ("getint" "GetInt" simula-expand-stdproc)
1449 ("getreal" "GetReal" simula-expand-stdproc)
1450 ("go" "GO" simula-expand-keyword)
1451 ("goto" "GOTO" simula-expand-keyword)
1452 ("gt" "GT" simula-expand-keyword)
1453 ("head" "Head" simula-expand-stdproc)
1454 ("hidden" "HIDDEN" simula-expand-keyword)
1455 ("histd" "HistD" simula-expand-stdproc)
1456 ("histo" "Histo" simula-expand-stdproc)
1457 ("hold" "Hold" simula-expand-stdproc)
1458 ("idle" "Idle" simula-expand-stdproc)
1459 ("if" "IF" simula-expand-keyword)
1460 ("image" "Image" simula-expand-stdproc)
1461 ("imagefile" "ImageFile" simula-expand-stdproc)
1462 ("imp" "IMP" simula-expand-keyword)
1463 ("in" "IN" simula-expand-keyword)
1464 ("inbyte" "InByte" simula-expand-stdproc)
1465 ("inbytefile" "InByteFile" simula-expand-stdproc)
1466 ("inchar" "InChar" simula-expand-stdproc)
1467 ("infile" "InFile" simula-expand-stdproc)
1468 ("infrac" "InFrac" simula-expand-stdproc)
1469 ("inimage" "InImage" simula-expand-stdproc)
1470 ("inint" "InInt" simula-expand-stdproc)
1471 ("inner" "INNER" simula-expand-keyword)
1472 ("inreal" "InReal" simula-expand-stdproc)
1473 ("inrecord" "InRecord" simula-expand-stdproc)
1474 ("inspect" "INSPECT" simula-expand-keyword)
1475 ("integer" "INTEGER" simula-expand-keyword)
1476 ("intext" "InText" simula-expand-stdproc)
1477 ("into" "Into" simula-expand-stdproc)
1478 ("is" "IS" simula-expand-keyword)
1479 ("isochar" "ISOChar" simula-expand-stdproc)
1480 ("isopen" "IsOpen" simula-expand-stdproc)
1481 ("isorank" "ISORank" simula-expand-stdproc)
1482 ("label" "LABEL" simula-expand-keyword)
1483 ("last" "Last" simula-expand-stdproc)
1484 ("lastitem" "LastItem" simula-expand-stdproc)
1485 ("lastloc" "LastLoc" simula-expand-stdproc)
1486 ("le" "LE" simula-expand-keyword)
1487 ("length" "Length" simula-expand-stdproc)
1488 ("letter" "Letter" simula-expand-stdproc)
1489 ("line" "Line" simula-expand-stdproc)
1490 ("linear" "Linear" simula-expand-stdproc)
1491 ("linesperpage" "LinesPerPage" simula-expand-stdproc)
1492 ("link" "Link" simula-expand-stdproc)
1493 ("linkage" "Linkage" simula-expand-stdproc)
1494 ("ln" "Ln" simula-expand-stdproc)
1495 ("locate" "Locate" simula-expand-stdproc)
1496 ("location" "Location" simula-expand-stdproc)
1497 ("lock" "Lock" simula-expand-stdproc)
1498 ("locked" "Locked" simula-expand-stdproc)
1499 ("log10" "Log10" simula-expand-stdproc)
1500 ("long" "LONG" simula-expand-keyword)
1501 ("lowcase" "LowCase" simula-expand-stdproc)
1502 ("lowerbound" "LowerBound" simula-expand-stdproc)
1503 ("lowten" "LowTen" simula-expand-stdproc)
1504 ("lt" "LT" simula-expand-keyword)
1505 ("main" "Main" simula-expand-stdproc)
1506 ("max" "Max" simula-expand-stdproc)
1507 ("maxint" "MaxInt" simula-expand-stdproc)
1508 ("maxlongreal" "MaxLongReal" simula-expand-stdproc)
1509 ("maxloc" "MaxLoc" simula-expand-stdproc)
1510 ("maxrank" "MaxRank" simula-expand-stdproc)
1511 ("maxreal" "MaxReal" simula-expand-stdproc)
1512 ("min" "Min" simula-expand-stdproc)
1513 ("minint" "MinInt" simula-expand-stdproc)
1514 ("minlongreal" "MinLongReal" simula-expand-stdproc)
1515 ("minrank" "MinRank" simula-expand-stdproc)
1516 ("minreal" "MinReal" simula-expand-stdproc)
1517 ("mod" "Mod" simula-expand-stdproc)
1518 ("more" "More" simula-expand-stdproc)
1519 ("name" "NAME" simula-expand-keyword)
1520 ("ne" "NE" simula-expand-keyword)
1521 ("negexp" "NegExp" simula-expand-stdproc)
1522 ("new" "NEW" simula-expand-keyword)
1523 ("nextev" "NextEv" simula-expand-stdproc)
1524 ("none" "NONE" simula-expand-keyword)
1525 ("normal" "Normal" simula-expand-stdproc)
1526 ("not" "NOT" simula-expand-keyword)
1527 ("notext" "NOTEXT" simula-expand-keyword)
1528 ("open" "Open" simula-expand-stdproc)
1529 ("or" "OR" simula-expand-keyword)
1530 ("otherwise" "OTHERWISE" simula-electric-keyword)
1531 ("out" "Out" simula-expand-stdproc)
1532 ("outbyte" "OutByte" simula-expand-stdproc)
1533 ("outbytefile" "OutByteFile" simula-expand-stdproc)
1534 ("outchar" "OutChar" simula-expand-stdproc)
1535 ("outfile" "OutFile" simula-expand-stdproc)
1536 ("outfix" "OutFix" simula-expand-stdproc)
1537 ("outfrac" "OutFrac" simula-expand-stdproc)
1538 ("outimage" "OutImage" simula-expand-stdproc)
1539 ("outint" "OutInt" simula-expand-stdproc)
1540 ("outreal" "OutReal" simula-expand-stdproc)
1541 ("outrecord" "OutRecord" simula-expand-stdproc)
1542 ("outtext" "OutText" simula-expand-stdproc)
1543 ("page" "Page" simula-expand-stdproc)
1544 ("passivate" "Passivate" simula-expand-stdproc)
1545 ("poisson" "Poisson" simula-expand-stdproc)
1546 ("pos" "Pos" simula-expand-stdproc)
1547 ("precede" "Precede" simula-expand-stdproc)
1548 ("pred" "Pred" simula-expand-stdproc)
1549 ("prev" "Prev" simula-expand-stdproc)
1550 ("printfile" "PrintFile" simula-expand-stdproc)
1551 ("prior" "PRIOR" simula-expand-keyword)
1552 ("procedure" "PROCEDURE" simula-expand-keyword)
1553 ("process" "Process" simula-expand-stdproc)
1554 ("protected" "PROTECTED" simula-expand-keyword)
1555 ("putchar" "PutChar" simula-expand-stdproc)
1556 ("putfix" "PutFix" simula-expand-stdproc)
1557 ("putfrac" "PutFrac" simula-expand-stdproc)
1558 ("putint" "PutInt" simula-expand-stdproc)
1559 ("putreal" "PutReal" simula-expand-stdproc)
1560 ("qua" "QUA" simula-expand-keyword)
1561 ("randint" "RandInt" simula-expand-stdproc)
1562 ("rank" "Rank" simula-expand-stdproc)
1563 ("reactivate" "REACTIVATE" simula-expand-keyword)
1564 ("real" "REAL" simula-expand-keyword)
1565 ("ref" "REF" simula-expand-keyword)
1566 ("resume" "Resume" simula-expand-stdproc)
1567 ("setaccess" "SetAccess" simula-expand-stdproc)
1568 ("setpos" "SetPos" simula-expand-stdproc)
1569 ("short" "SHORT" simula-expand-keyword)
1570 ("sign" "Sign" simula-expand-stdproc)
1571 ("simset" "SimSet" simula-expand-stdproc)
1572 ("simulaid" "SimulaId" simula-expand-stdproc)
1573 ("simulation" "Simulation" simula-expand-stdproc)
1574 ("sin" "Sin" simula-expand-stdproc)
1575 ("sinh" "SinH" simula-expand-stdproc)
1576 ("sourceline" "SourceLine" simula-expand-stdproc)
1577 ("spacing" "Spacing" simula-expand-stdproc)
1578 ("sqrt" "Sqrt" simula-expand-stdproc)
1579 ("start" "Start" simula-expand-stdproc)
1580 ("step" "STEP" simula-expand-keyword)
1581 ("strip" "Strip" simula-expand-stdproc)
1582 ("sub" "Sub" simula-expand-stdproc)
1583 ("subepsilon" "SubEpsilon" simula-expand-stdproc)
1584 ("suc" "Suc" simula-expand-stdproc)
1585 ("switch" "SWITCH" simula-expand-keyword)
1586 ("sysin" "SysIn" simula-expand-stdproc)
1587 ("sysout" "SysOut" simula-expand-stdproc)
1588 ("tan" "Tan" simula-expand-stdproc)
1589 ("tanh" "TanH" simula-expand-stdproc)
1590 ("terminate_program" "Terminate_Program" simula-expand-stdproc)
1591 ("terminated" "Terminated" simula-expand-stdproc)
1592 ("text" "TEXT" simula-expand-keyword)
1593 ("then" "THEN" simula-electric-keyword)
1594 ("this" "THIS" simula-expand-keyword)
1595 ("time" "Time" simula-expand-stdproc)
1596 ("to" "TO" simula-expand-keyword)
1597 ("true" "TRUE" simula-expand-keyword)
1598 ("uniform" "Uniform" simula-expand-stdproc)
1599 ("unlock" "Unlock" simula-expand-stdproc)
1600 ("until" "UNTIL" simula-expand-keyword)
1601 ("upcase" "Upcase" simula-expand-stdproc)
1602 ("upperbound" "UpperBound" simula-expand-stdproc)
1603 ("value" "VALUE" simula-expand-keyword)
1604 ("virtual" "VIRTUAL" simula-expand-keyword)
1605 ("wait" "Wait" simula-expand-stdproc)
1606 ("when" "WHEN" simula-electric-keyword)
1607 ("while" "WHILE" simula-expand-keyword)))
1608 (define-abbrev simula-mode-abbrev-table
1609 (nth 0 args) (nth 1 args) (nth 2 args) nil 'system)))
1610
1611 (if simula-abbrev-file
1612 (read-abbrev-file simula-abbrev-file))
1613 (let (abbrevs-changed)
1614 (simula-install-standard-abbrevs))
1615
1616 ;; Hilit mode support.
1617 (when (fboundp 'hilit-set-mode-patterns)
1618 (when (and (boundp 'hilit-patterns-alist)
1619 (not (assoc 'simula-mode hilit-patterns-alist)))
1620 (hilit-set-mode-patterns
1621 'simula-mode
1622 '(
1623 ("^%\\([ \t\f].*\\)?$" nil comment)
1624 ("^%include\\>" nil include)
1625 ("\"[^\"\n]*\"\\|'.'\\|'![0-9]+!'" nil string)
1626 ("\\<\\(ACTIVATE\\|AFTER\\|AND\\|ARRAY\\|AT\\|BEFORE\\|BEGIN\\|BOOLEAN\\|CHARACTER\\|CLASS\\|DELAY\\|DO\\|ELSE\\|END\\|EQ\\|EQV\\|EXTERNAL\\|FALSE\\|FOR\\|GE\\|GO\\|GOTO\\|GT\\|HIDDEN\\|IF\\|IMP\\|IN\\|INNER\\|INSPECT\\|INTEGER\\|IS\\|LABEL\\|LE\\|LONG\\|LT\\|NAME\\|NE\\|NEW\\|NONE\\|NOT\\|NOTEXT\\|OR\\|OTHERWISE\\|PRIOR\\|PROCEDURE\\|PROTECTED\\|QUA\\|REACTIVATE\\|REAL\\|REF\\|SHORT\\|STEP\\|SWITCH\\|TEXT\\|THEN\\|THIS\\|TO\\|TRUE\\|UNTIL\\|VALUE\\|VIRTUAL\\|WHEN\\|WHILE\\)\\>" nil keyword)
1627 ("!\\|\\<COMMENT\\>" ";" comment))
1628 nil 'case-insensitive)))
1629 \f
1630 ;; defuns for submitting bug reports
1631
1632 (defconst simula-mode-help-address "bug-gnu-emacs@gnu.org"
1633 "Address accepting submission of `simula-mode' bug reports.")
1634
1635 (defun simula-submit-bug-report ()
1636 "Submit via mail a bug report on `simula-mode'."
1637 (interactive)
1638 (and
1639 (y-or-n-p "Do you want to submit a report on simula-mode? ")
1640 (reporter-submit-bug-report
1641 simula-mode-help-address
1642 (concat "simula-mode from Emacs " emacs-version)
1643 (list
1644 ;; report only the vars that affect indentation
1645 'simula-indent-level
1646 'simula-substatement-offset
1647 'simula-continued-statement-offset
1648 'simula-label-offset
1649 'simula-if-indent
1650 'simula-inspect-indent
1651 'simula-electric-indent
1652 'simula-abbrev-keyword
1653 'simula-abbrev-stdproc
1654 'simula-abbrev-file
1655 'simula-tab-always-indent
1656 ))))
1657
1658 (provide 'simula)
1659
1660 ;; arch-tag: 488c1bb0-eebf-4f06-93df-1df603f06255
1661 ;;; simula.el ends here