1 ;;; simula.el --- SIMULA 87 code editing commands for Emacs
3 ;; Copyright (C) 1992 Free Software Foundation, Inc.
5 ;; Author: Hans Henrik Eriksen <hhe@ifi.uio.no>
6 ;; Maintainer: simula-mode@ifi.uio.no
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs; see the file COPYING. If not, write to
25 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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.
33 ;; Hans Henrik Eriksen (the author) may be reached at:
34 ;; Institutt for informatikk,
35 ;; Universitetet i Oslo
39 (provide 'simula-mode
)
41 (defconst simula-tab-always-indent nil
42 "*Non-nil means TAB in SIMULA mode should always reindent the current line.
43 Otherwise TAB indents only when point is within
44 the run of whitespace at the beginning of the line.")
46 (defconst simula-indent-level
3
47 "*Indentation of SIMULA statements with respect to containing block.")
49 (defconst simula-substatement-offset
3
50 "*Extra indentation after DO, THEN, ELSE, WHEN and OTHERWISE.")
52 (defconst simula-continued-statement-offset
3
53 "*Extra indentation for lines not starting a statement or substatement.
54 If value is a list, each line in a multipleline continued statement
55 will have the car of the list extra indentation with respect to
56 the previous line of the statement.")
58 (defconst simula-label-offset -
4711
59 "*Offset of SIMULA label lines relative to usual indentation.")
61 (defconst simula-if-indent
'(0 .
0)
62 "*Extra indentation of THEN and ELSE with respect to the starting IF.
63 Value is a cons cell, the car is extra THEN indentation and the cdr
64 extra ELSE indentation. IF after ELSE is indented as the starting IF.")
66 (defconst simula-inspect-indent
'(0 .
0)
67 "*Extra indentation of WHEN and OTHERWISE with respect to the INSPECT.
68 Value is a cons cell, the car is extra WHEN indentation
69 and the cdr extra OTHERWISE indentation.")
71 (defconst simula-electric-indent nil
72 "*Non-nil means `simula-indent-line' function may reindent previous line.")
74 (defconst simula-abbrev-keyword
'upcase
75 "*Specify how to convert case for SIMULA keywords.
76 Value is one of the symbols `upcase', `downcase', `capitalize',
77 \(as in) `abbrev-table' or nil if they should not be changed.")
79 (defconst simula-abbrev-stdproc
'abbrev-table
80 "*Specify how to convert case for standard SIMULA procedure and class names.
81 Value is one of the symbols `upcase', `downcase', `capitalize',
82 \(as in) `abbrev-table', or nil if they should not be changed.")
84 (defvar simula-abbrev-file nil
85 "*File with extra abbrev definitions for use in SIMULA mode.
86 These are used together with the standard abbrev definitions for SIMULA.
87 Please note that the standard definitions are required
88 for SIMULA mode to function correctly.")
90 (defvar simula-mode-syntax-table nil
91 "Syntax table in SIMULA mode buffers.")
93 (if simula-mode-syntax-table
95 (setq simula-mode-syntax-table
(copy-syntax-table (standard-syntax-table)))
96 (modify-syntax-entry ?
! "<" simula-mode-syntax-table
)
97 (modify-syntax-entry ?$
"." simula-mode-syntax-table
)
98 (modify-syntax-entry ?%
"." simula-mode-syntax-table
)
99 (modify-syntax-entry ?
' "\"" simula-mode-syntax-table
)
100 (modify-syntax-entry ?\
( "()" simula-mode-syntax-table
)
101 (modify-syntax-entry ?\
) ")(" simula-mode-syntax-table
)
102 (modify-syntax-entry ?\
; ">" simula-mode-syntax-table)
103 (modify-syntax-entry ?\
[ "." simula-mode-syntax-table
)
104 (modify-syntax-entry ?
\\ "." simula-mode-syntax-table
)
105 (modify-syntax-entry ?\
] "." simula-mode-syntax-table
)
106 (modify-syntax-entry ?_
"w" simula-mode-syntax-table
)
107 (modify-syntax-entry ?\|
"." simula-mode-syntax-table
)
108 (modify-syntax-entry ?\
{ "." simula-mode-syntax-table
)
109 (modify-syntax-entry ?\
} "." simula-mode-syntax-table
))
111 (defvar simula-mode-map
()
112 "Keymap used in SIMULA mode.")
116 (setq simula-mode-map
(make-sparse-keymap))
117 (define-key simula-mode-map
"\C-c\C-u" 'simula-backward-up-level
)
118 (define-key simula-mode-map
"\C-c\C-p" 'simula-previous-statement
)
119 (define-key simula-mode-map
"\C-c\C-d" 'simula-forward-down-level
)
120 (define-key simula-mode-map
"\C-c\C-n" 'simula-next-statement
)
121 ;(define-key simula-mode-map "\C-c\C-g" 'simula-goto-definition)
122 ;(define-key simula-mode-map "\C-c\C-h" 'simula-standard-help)
123 (define-key simula-mode-map
"\177" 'backward-delete-char-untabify
)
124 (define-key simula-mode-map
":" 'simula-electric-label
)
125 (define-key simula-mode-map
"\t" 'simula-indent-command
))
127 (defvar simula-mode-abbrev-table nil
128 "Abbrev table in SIMULA mode buffers")
131 (defun simula-mode ()
132 "Major mode for editing SIMULA code.
134 Variables controlling indentation style:
135 simula-tab-always-indent
136 Non-nil means TAB in SIMULA mode should always reindent the current line,
137 regardless of where in the line point is when the TAB command is used.
139 Indentation of SIMULA statements with respect to containing block.
140 simula-substatement-offset
141 Extra indentation after DO, THEN, ELSE, WHEN and OTHERWISE.
142 simula-continued-statement-offset 3
143 Extra indentation for lines not starting a statement or substatement,
144 e.g. a nested FOR-loop. If value is a list, each line in a multiple-
145 line continued statement will have the car of the list extra indentation
146 with respect to the previous line of the statement.
147 simula-label-offset -4711
148 Offset of SIMULA label lines relative to usual indentation.
149 simula-if-indent '(0 . 0)
150 Extra indentation of THEN and ELSE with respect to the starting IF.
151 Value is a cons cell, the car is extra THEN indentation and the cdr
152 extra ELSE indentation. IF after ELSE is indented as the starting IF.
153 simula-inspect-indent '(0 . 0)
154 Extra indentation of WHEN and OTHERWISE with respect to the
155 corresponding INSPECT. Value is a cons cell, the car is
156 extra WHEN indentation and the cdr extra OTHERWISE indentation.
157 simula-electric-indent nil
158 If this variable is non-nil, `simula-indent-line'
159 will check the previous line to see if it has to be reindented.
160 simula-abbrev-keyword 'upcase
161 Determine how SIMULA keywords will be expanded. Value is one of
162 the symbols `upcase', `downcase', `capitalize', (as in) `abbrev-table',
163 or nil if they should not be changed.
164 simula-abbrev-stdproc 'abbrev-table
165 Determine how standard SIMULA procedure and class names will be
166 expanded. Value is one of the symbols `upcase', `downcase', `capitalize',
167 (as in) `abbrev-table', or nil if they should not be changed.
169 Turning on SIMULA mode calls the value of the variable simula-mode-hook
170 with no arguments, if that value is non-nil
172 Warning: simula-mode-hook should not read in an abbrev file without calling
173 the function simula-install-standard-abbrevs afterwards, preferably not
176 (kill-all-local-variables)
177 (use-local-map simula-mode-map
)
178 (setq major-mode
'simula-mode
)
179 (setq mode-name
"SIMULA")
180 (make-local-variable 'comment-column
)
181 (setq comment-column
40)
182 (make-local-variable 'end-comment-column
)
183 (setq end-comment-column
75)
184 (set-syntax-table simula-mode-syntax-table
)
185 (make-local-variable 'paragraph-start
)
186 (setq paragraph-start
"^[ \t]*$\\|\\f")
187 (make-local-variable 'paragraph-separate
)
188 (setq paragraph-separate paragraph-start
)
189 (make-local-variable 'indent-line-function
)
190 (setq indent-line-function
'simula-indent-line
)
191 (make-local-variable 'require-final-newline
)
192 (setq require-final-newline t
)
193 (make-local-variable 'comment-start
)
194 (setq comment-start
"! ")
195 (make-local-variable 'comment-end
)
196 (setq comment-end
" ;")
197 (make-local-variable 'comment-start-skip
)
198 (setq comment-start-skip
"!+ *")
199 (make-local-variable 'parse-sexp-ignore-comments
)
200 (setq parse-sexp-ignore-comments nil
)
201 (make-local-variable 'comment-multi-line
)
202 (setq comment-multi-line t
)
203 (if simula-mode-abbrev-table
205 (if simula-abbrev-file
206 (read-abbrev-file simula-abbrev-file
)
207 (define-abbrev-table 'simula-mode-abbrev-table
()))
208 (let (abbrevs-changed)
209 (simula-install-standard-abbrevs)))
210 (setq local-abbrev-table simula-mode-abbrev-table
)
212 (run-hooks 'simula-mode-hook
))
216 (defun simula-indent-line ()
217 "Indent this line as SIMULA code.
218 If `simula-electric-indent' is non-nil, indent previous line if necessary."
219 (let ((origin (- (point-max) (point)))
220 (indent (simula-calculate-indent))
221 (case-fold-search t
))
225 ;; manually expand abbrev on last line, if any
229 ;; now maybe we should reindent that line
230 (if simula-electric-indent
233 (skip-chars-forward " \t\f")
236 "\\(end\\|if\\|then\\|else\\|when\\|otherwise\\)\\>")
237 (not (simula-context)))
239 (let ((post-indent (simula-calculate-indent)))
240 (if (eq (current-indentation) post-indent
)
242 (delete-horizontal-space)
243 (indent-to post-indent
)))))))
244 (goto-char (- (point-max) origin
))
245 (if (eq (current-indentation) indent
)
246 (back-to-indentation)
247 (delete-horizontal-space)
248 (indent-to indent
)))))
251 (defun simula-indent-command (&optional whole-exp
)
252 "Indent current line as SIMULA code, or insert TAB character.
253 If `simula-tab-always-indent' is non-nil, always indent current line.
254 Otherwise, indent only if point is before any non-whitespace
255 character on the line.
257 A numeric argument, regardless of its value, means indent rigidly
258 all the lines of the SIMULA statement after point so that this line
259 becomes properly indented.
260 The relative indentation among the lines of the statement are preserved."
262 (let ((case-fold-search t
))
263 (if (or whole-exp simula-tab-always-indent
265 (skip-chars-backward " \t\f")
267 ;; reindent current line
268 (let ((indent (save-excursion
270 (simula-calculate-indent)))
271 (current (current-indentation))
272 (origin (- (point-max) (point)))
274 (skip-chars-backward " \t\f")
278 (if (eq current indent
)
280 (skip-chars-backward " \t\f")
282 (back-to-indentation))
284 (delete-horizontal-space)
287 (goto-char (- (point-max) origin
))))
288 (setq origin
(point))
291 (beginning-of-line 2)
294 (simula-next-statement 1)
296 (if (and (> end beg
) (not (eq indent current
)))
297 (indent-code-rigidly beg end
(- indent current
) "%")))))
301 (defun simula-context ()
302 "Returns value according to syntactic SIMULA context of point.
303 0 point inside COMMENT comment
304 1 point on SIMULA-compiler directive line
305 2 point inside END comment
306 3 point inside string
307 4 point inside character constant
309 ;; first, find out if this is a compiler directive line
312 (eq (following-char) ?%
))
316 ;; The current line is NOT a compiler directive line.
317 ;; Now, the strategy is to search backward to find a semicolon
318 ;; that is NOT inside a string. The point after semicolon MUST be
319 ;; outside a comment, since semicolons are comment-ending and
320 ;; comments are non-recursive. We take advantage of the fact
321 ;; that strings MUST end on the same line as they started, so
322 ;; that we can easily decide whether we are inside a string or not.
323 (let (return-value (origin (point)))
324 (skip-chars-backward "^;" (point-min))
325 ;; found semicolon or beginning of buffer
326 (let (loopvalue (saved-point origin
))
327 (while (and (not (bobp))
330 ;; compiler directive line? If so, cont searching..
331 (eq (following-char) ?%
))
333 (while (< (point) saved-point
)
334 (skip-chars-forward "^;\"'")
337 ((eq (preceding-char) ?\
;)
338 (setq saved-point
(point)))
339 ((eq (preceding-char) ?
\")
340 (skip-chars-forward "^\";")
341 (if (eq (following-char) ?\
;)
342 (setq saved-point
(point) loopvalue t
)
345 (if (eq (following-char) ?
')
347 (skip-chars-forward "^';")
348 (if (eq (following-char) ?\
;)
349 (setq saved-point
(point) loopvalue t
)
353 (skip-chars-backward "^;")
354 (setq saved-point
(point) loopvalue nil
)))
355 ;; Now we are CERTAIN that we are outside comments and strings.
356 ;; The job now is to search forward again towards the origin
357 ;; skipping directives, comments and strings correctly,
358 ;; so that we know what context we are in when we find the origin.
362 "\\<end\\>\\|!\\|\"\\|'\\|^%\\|\\<comment\\>" origin
'move
))
364 ((memq (preceding-char) '(?d ?D
))
365 (setq return-value
2)
366 (while (and (memq (preceding-char) '(?d ?D
)) (not return-value
))
367 (while (and (re-search-forward
368 ";\\|\\<end\\>\\|\\<else\\>\\|\\<otherwise\\>\\|\\<when\\>\\|^%"
370 (eq (preceding-char) ?%
))
371 (beginning-of-line 2)))
372 (if (looking-at "[ \t\n\f]*\\(;\\|\\<end\\>\\|\\<else\\>\\|\\<otherwise\\>\\|\\<when\\>\\)")
373 (setq return-value nil
)))
374 ((memq (preceding-char) '(?
! ?t ?T
))
376 (setq return-value
0)
377 (skip-chars-forward "^%;" origin
)
378 (while (and return-value
(< (point) origin
))
379 (if (eq (following-char) ?\
;)
380 (setq return-value nil
)
382 (beginning-of-line 2) ; skip directive inside comment
383 (forward-char 1)) ; or single '%'
384 (skip-chars-forward "^%;" origin
))))
385 ((eq (preceding-char) ?
\")
386 (if (not (search-forward "\"" origin
'move
))
387 (setq return-value
3)))
388 ((eq (preceding-char) ?
\')
389 (if (or (eq (point) origin
) (eobp))
390 (setq return-value
4)
392 (if (not (search-forward "'" origin
'move
))
393 (setq return-value
4))))
394 ;; compiler directive line - skip
395 (t (beginning-of-line 2))))
400 (defun simula-electric-label ()
401 "If this is a label that starts the line, reindent the line."
405 (let ((origin (- (point-max) (point)))
407 ;; don't mix a label with an assignment operator := :-
408 ;; therefore look at next typed character...
409 (next-char (setq unread-command-events
(list (read-event))))
410 (com-char last-command-char
))
412 ;; Problem: find out if character just read is a command char
413 ;; that would insert something after ':' making it a label.
414 ;; At least \n, \r (and maybe \t) falls into this category.
415 ;; This is a real crock, it depends on traditional keymap
416 ;; bindings, that is, printing characters doing self-insert,
417 ;; and no other command sequence inserting '-' or '='.
418 ;; simula-electric-label can be easily fooled...
419 (if (and (not (memq next-char
'(?
= ?-
)))
420 (or (memq next-char
'(?
\n ?
\r))
421 (and (eq next-char ?
\t)
422 simula-tab-always-indent
)
423 (not (memq (following-char) '(?
= ?-
))))
424 (not (simula-context))
428 (skip-chars-backward " \t\f")
429 (skip-chars-backward "a-zA-Z0-9_")
430 (if (looking-at "virtual\\>")
432 (skip-chars-backward " \t\f")
434 (let ((amount (simula-calculate-indent)))
435 (delete-horizontal-space)
437 (goto-char (- (point-max) origin
)))))
440 (defun simula-backward-up-level (count)
441 "Move backward up COUNT block levels.
442 If COUNT is negative, move forward up block level instead."
444 (let ((origin (point))
445 (case-fold-search t
))
449 (re-search-backward "\\<begin\\>\\|\\<end\\>")
450 (if (not (simula-context))
451 (setq count
(if (memq (following-char) '(?b ?B
))
455 (re-search-forward "\\<begin\\>\\|\\<end\\>")
457 (if (not (simula-context))
458 (setq count
(if (memq (following-char) '(?e ?E
))
462 ;; If block level not found, jump back to origin and signal an error
465 (error "No higher block level")))
468 (signal 'quit nil
))))))
471 (defun simula-forward-down-level (count)
472 "Move forward down COUNT block levels.
473 If COUNT is negative, move backward down block level instead."
475 ;; When we search for a deeper block level, we must never
476 ;; get out of the block where we started -> count >= start-count
477 (let ((start-count count
)
479 (case-fold-search t
))
483 (re-search-backward "\\<begin\\>\\|\\<end\\>")
484 (if (not (simula-context))
485 (setq count
(if (memq (following-char) '(?e ?E
))
488 (if (< count start-count
) (signal 'error nil
)))
490 (re-search-forward "\\<begin\\>\\|\\<end\\>")
492 (if (not (simula-context))
493 (setq count
(if (memq (following-char) '(?b ?B
))
497 ;; deeper level has to be found within starting block
498 (if (> count start-count
) (signal 'error nil
))))
499 ;; If block level not found, jump back to origin and signal an error
502 (error "No containing block level")))
505 (signal 'quit nil
))))))
508 (defun simula-previous-statement (count)
509 "Move backward COUNT statements.
510 If COUNT is negative, move forward instead."
513 (simula-next-statement (- count
))
519 (simula-skip-comment-backward)
520 (if (memq (preceding-char) '(?n ?N
))
523 (if (not (looking-at "\\<begin\\>"))
525 (if (eq (preceding-char) ?\
;)
527 (while (and (natnump (setq count
(1- count
)))
528 (setq status
(simula-search-backward
529 ";\\|\\<begin\\>" nil
'move
))))
532 (if (eq (following-char) ?\
;)
534 (backward-word -
1))))
535 (simula-skip-comment-forward))
536 (error (progn (goto-char origin
)
537 (error "Incomplete statement (too many ENDs)")))
538 (quit (progn (goto-char origin
) (signal 'quit nil
)))))))
541 (defun simula-next-statement (count)
542 "Move forward COUNT statements.
543 If COUNT is negative, move backward instead."
546 (simula-previous-statement (- count
))
552 (simula-skip-comment-forward)
553 (if (looking-at "\\<end\\>") (forward-word 1))
554 (while (and (natnump (setq count
(1- count
)))
555 (setq status
(simula-search-forward
556 ";\\|\\<end\\>" (point-max) 'move
))))
557 (if (and status
(/= (preceding-char) ?\
;))
560 (simula-skip-comment-backward))))
561 (error (progn (goto-char origin
)
562 (error "Incomplete statement (too few ENDs)")))
563 (quit (progn (goto-char origin
) (signal 'quit nil
)))))))
566 (defun simula-skip-comment-backward ()
567 "Search towards bob to find first char that is outside a comment."
572 (skip-chars-backward " \t\n\f")
573 (if (eq (preceding-char) ?\
;)
576 (setq context
(simula-context)))
577 (setq context
(simula-context)))
579 ((memq context
'(nil 3 4))
580 ;; check to see if we found a label
581 (if (and (eq (preceding-char) ?
:)
582 (not (memq (following-char) '(?- ?
=)))
584 (skip-chars-backward ": \t\fa-zA-Z0-9_")
585 (not (looking-at "virtual\\>"))))
586 (skip-chars-backward ": \t\fa-zA-Z0-9_")
587 (throw 'simula-out nil
)))
589 ;; since we are inside a comment, it must start somewhere!
590 (while (and (re-search-backward "!\\|\\<comment\\>")
591 (memq (simula-context) '(0 1)))))
595 (throw 'simula-out nil
)))
597 ;; an END-comment must belong to an END
598 (re-search-backward "\\<end\\>")
600 (throw 'simula-out nil
))
601 ;; should be impossible to get here..
605 (defun simula-skip-comment-forward ()
606 "Search towards eob to find first char that is outside a comment."
607 ;; this function assumes we start with point .outside a comment
611 (skip-chars-forward " \t\n\f")
613 ((looking-at "!\\|\\<comment\\>")
614 (search-forward ";" nil
'move
))
615 ((and (bolp) (eq (following-char) ?%
))
616 (beginning-of-line 2))
617 ((and (looking-at "[a-z0-9_]*[ \t\f]*:[^-=]")
618 (not (looking-at "virtual\\>")))
619 (skip-chars-forward "a-zA-Z0-9_ \t\f:"))
621 (throw 'simula-out t
))))))
624 (defun simula-forward-up-level ()
625 (let ((continue-loop t
)
631 (if (re-search-backward "\\<begin\\>\\|\\<end\\>" (point-min) 'move
)
632 (setq temp
(simula-context)
633 return-value
(and (memq (preceding-char) '(?d ?D
))
634 (memq temp
'(nil 2)))
635 continue-loop
(and (not return-value
)
636 (simula-forward-up-level)))
637 (setq continue-loop nil
)))
644 (defun simula-calculate-indent ()
646 (let ((where (simula-context))
658 ;; If comment started on previous non-blank line, indent to the
659 ;; column where the comment started, else indent as that line.
661 (skip-chars-backward " \t\n\f")
662 (while (and (not (bolp)) (eq (simula-context) 0))
663 (re-search-backward "^\\|!\\|\\<comment\\>"))
664 (skip-chars-forward " \t\n\f")
669 ;; Detect missing string delimiters
672 (error "Inside string"))
674 (error "Inside character constant"))
676 ;; check to see if inside ()'s
678 ((setq temp
(simula-inside-parens))
681 ;; Calculate non-comment indentation
683 ;; first, find out if this line starts with something that needs
684 ;; special indentation (END/IF/THEN/ELSE/WHEN/OTHERWISE or label)
686 (skip-chars-forward " \t\f")
691 ((looking-at "end\\>")
692 (setq indent
(- simula-indent-level
)
697 ((looking-at "if\\>\\|then\\>\\|else\\>")
698 ;; search for the *starting* IF
700 ((memq (following-char) '(?T ?t
))
701 (setq indent
(car simula-if-indent
)))
702 ((memq (following-char) '(?E ?e
))
703 (setq indent
(cdr simula-if-indent
)))
711 ((looking-at "when\\>\\|otherwise\\>")
712 ;; search for corresponding INSPECT
713 (if (memq (following-char) '(?W ?w
))
714 (setq indent
(car simula-inspect-indent
))
715 (setq indent
(cdr simula-inspect-indent
)))
716 (simula-find-inspect))
720 ((and (not (looking-at "virtual\\>"))
721 (looking-at "[a-z0-9_]*[ \t\f]*:[^-=]"))
722 (setq indent simula-label-offset
)))
723 ;; find line with non-comment text
724 (simula-skip-comment-backward)
726 (not (eq (preceding-char) ?\
;))
727 (if (memq (preceding-char) '(?N ?n
))
730 (not (looking-at "begin\\>")))
733 (simula-previous-statement 1)
734 (simula-skip-comment-backward)))
736 (save-excursion (beginning-of-line) (point))
737 ;; - perhaps this is a continued statement
742 (if (eq (char-syntax (preceding-char)) ?w
)
746 "begin\\|then\\|else\\|when\\|otherwise\\|do"
748 (not (memq (preceding-char) '(?
: ?\
;)))))))
750 ;; MAIN calculation loop - count BEGIN/DO etc.
753 (if (re-search-backward
754 ";\\|\\<\\(begin\\|end\\|if\\|else\\|then\\|when\\|otherwise\\|do\\)\\>"
757 ();; found something in a comment/string - ignore
758 (setq temp
(following-char))
761 (simula-previous-statement 1))
762 ((looking-at "begin\\>")
763 (setq indent
(+ indent simula-indent-level
)))
764 ((looking-at "end\\>")
766 (simula-previous-statement 1))
767 ((looking-at "do\\>")
768 (setq indent
(+ indent simula-substatement-offset
))
769 (simula-find-do-match))
770 ((looking-at "\\(if\\|then\\|else\\)\\>")
771 (if (memq temp
'(?I ?i
))
773 (setq indent
(+ indent
774 simula-substatement-offset
775 (if (memq temp
'(?T ?t
))
776 (car simula-if-indent
)
777 (cdr simula-if-indent
)))))
779 ((looking-at "\\<when\\>\\|\\<otherwise\\>")
780 (setq indent
(+ indent
781 simula-substatement-offset
782 (if (memq temp
'(?W ?w
))
783 (car simula-if-indent
)
784 (cdr simula-if-indent
))))
785 (simula-find-inspect)))
786 ;; found the start of a [sub]statement
787 ;; add indentation for continued statement
791 (if (listp simula-continued-statement-offset
)
792 (car simula-continued-statement-offset
)
793 simula-continued-statement-offset
))))
795 (save-excursion (beginning-of-line) (point))
797 ;; search failed .. point is at beginning of line
798 ;; determine if we should continue searching
799 ;; (at or before comment or label)
800 ;; temp = t means finished
802 (and (not (simula-context))
804 (skip-chars-forward " \t\f")
805 (or (looking-at "virtual")
808 "!\\|comment\\>\\|[a-z0-9_]*[ \t\f]*:[^-=]")))))
810 ;; if we are finished, find current line's indentation
812 (setq indent
(+ indent
(current-indentation))))
813 ;; find next line with non-comment SIMULA text
814 ;; maybe indent extra if statement continues
815 (simula-skip-comment-backward)
818 (if (eq (char-syntax (preceding-char)) ?w
)
822 "begin\\|then\\|else\\|when\\|otherwise\\|do")))
823 (not (memq (preceding-char) '(?
: ?\
;))))))
824 ;; if we the state of the continued-variable
825 ;; changed, add indentation for continued statement
826 (if (or (and prev-cont
(not continued
))
828 (listp simula-continued-statement-offset
)))
831 (if (listp simula-continued-statement-offset
)
832 (car simula-continued-statement-offset
)
833 simula-continued-statement-offset
))))
834 ;; while ends if point is at beginning of line at loop test
836 (setq start-line
(save-excursion (beginning-of-line) (point)))
837 (beginning-of-line))))
839 ;; return indentation
844 (defun simula-find-if ()
845 "Find starting IF of a IF-THEN[-ELSE[-IF-THEN...]] statement."
848 (if (and (simula-search-backward "\\<if\\>\\|;\\|\\<begin\\>"nil t
)
849 (memq (following-char) '(?I ?i
)))
852 ;; find out if this IF was really the start of the IF statement
854 (simula-skip-comment-backward)
855 (if (and (eq (char-syntax (preceding-char)) ?w
)
858 (looking-at "else\\>")))
860 (throw 'simula-out t
)))
861 (if (not (looking-at "\\<if\\>"))
862 (error "Missing IF or misplaced BEGIN or ';' (can't find IF)")
864 ;; we were at the starting IF in the first place..
866 (throw 'simula-out t
))))))
869 (defun simula-find-inspect ()
870 "Find INSPECT matching WHEN or OTHERWISE."
874 ;; INSPECTs can be nested, have to find the corresponding one
877 (if (and (simula-search-backward "\\<inspect\\>\\|\\<otherwise\\>\\|;"
879 (/= (following-char) ?\
;))
880 (if (memq (following-char) '(?O ?o
))
881 (setq level
(1+ level
))
883 (throw 'simula-out t
)
884 (setq level
(1- level
))))
885 (error "Missing INSPECT or misplaced ';' (can't find INSPECT)"))))))
888 (defun simula-find-do-match ()
889 "Find keyword matching DO: FOR, WHILE, INSPECT or WHEN"
890 (while (and (re-search-backward
891 "\\<\\(do\\|for\\|while\\|inspect\\|when\\|end\\|begin\\)\\>\\|;"
894 (if (and (looking-at "\\<\\(for\\|while\\|inspect\\|when\\)\\>")
895 (not (simula-context)))
897 (error "No matching FOR, WHILE or INSPECT for DO, or misplaced ';'")))
900 (defun simula-inside-parens ()
901 "Return position after `(' on line if inside parentheses, nil otherwise."
906 (if (re-search-backward "(\\|)\\|;" nil t
)
907 (if (eq (simula-context) nil
)
908 ;; found something - check it out
910 ((eq (following-char) ?\
;)
912 (throw 'simula-out nil
)
913 (error "Parenthesis mismatch or misplaced ';'")))
914 ((eq (following-char) ?\
()
916 (throw 'simula-out
(1+ (current-column)))
917 (setq parlevel
(1- parlevel
))))
918 (t (setq parlevel
(1+ parlevel
))))
919 );; nothing - inside comment or string
921 (throw 'simula-out nil
)))))))
924 (defun simula-goto-definition ()
925 "Goto point of definition of variable, procedure or class."
929 (defun simula-expand-stdproc ()
930 (if (or (not simula-abbrev-stdproc
) (simula-context))
933 ((eq simula-abbrev-stdproc
'upcase
) (upcase-word -
1))
934 ((eq simula-abbrev-stdproc
'downcase
) (downcase-word -
1))
935 ((eq simula-abbrev-stdproc
'capitalize
) (capitalize-word -
1)))))
938 (defun simula-expand-keyword ()
939 (if (or (not simula-abbrev-keyword
) (simula-context))
942 ((eq simula-abbrev-keyword
'upcase
) (upcase-word -
1))
943 ((eq simula-abbrev-keyword
'downcase
) (downcase-word -
1))
944 ((eq simula-abbrev-keyword
'capitalize
) (capitalize-word -
1)))))
947 (defun simula-electric-keyword ()
948 "Expand SIMULA keyword. If it starts the line, reindent."
950 (let ((show-char (eq this-command
'self-insert-command
)))
951 ;; If the abbrev expansion results in reindentation, the user may have
952 ;; to wait some time before the character he typed is displayed
953 ;; (the char causing the expansion is inserted AFTER the hook function
954 ;; is called). This is annoying in case of normal characters.
955 ;; However, if the user pressed a key bound to newline, it is better
956 ;; to have the line inserted after the begin-end match.
959 (insert-char last-command-char
1)
962 (if (let ((where (simula-context))
963 (case-fold-search t
))
965 (if (and (eq where
2) (eq (char-syntax (preceding-char)) ?w
))
968 (not (looking-at "end\\>"))))))
971 ((not simula-abbrev-keyword
) (unexpand-abbrev))
972 ((eq simula-abbrev-keyword
'upcase
) (upcase-word -
1))
973 ((eq simula-abbrev-keyword
'downcase
) (downcase-word -
1))
974 ((eq simula-abbrev-keyword
'capitalize
) (capitalize-word -
1)))
975 (let ((pos (- (point-max) (point)))
980 ;; check if the expanded word is on the beginning of the line.
981 (if (and (eq (char-syntax (preceding-char)) ?w
)
984 (if (looking-at "end\\>")
986 (simula-backward-up-level 1)
987 (if (pos-visible-in-window-p)
993 (+ (point) (window-width))))))))
994 (skip-chars-backward " \t\f")
996 (let ((indent (simula-calculate-indent)))
997 (if (eq indent
(current-indentation))
999 (delete-horizontal-space)
1000 (indent-to indent
)))
1001 (skip-chars-forward " \t\f"))
1002 ;; check for END - blow whistles and ring bells
1004 (goto-char (- (point-max) pos
))
1007 (quit (goto-char (- (point-max) pos
))))))))
1010 (defun simula-search-backward (string &optional limit move
)
1011 (setq string
(concat string
"\\|\\<end\\>"))
1014 (while (re-search-backward string limit move
)
1015 (if (simula-context)
1017 (if (looking-at "\\<end\\>")
1020 (while (natnump level
)
1021 (re-search-backward "\\<begin\\>\\|\\<end\\>")
1022 (if (simula-context)
1024 (setq level
(if (memq (following-char) '(?b ?B
))
1027 (throw 'simula-out t
)))))))
1030 (defun simula-search-forward (string &optional limit move
)
1031 (setq string
(concat string
"\\|\\<begin\\>"))
1034 (while (re-search-forward string limit move
)
1035 (goto-char (match-beginning 0))
1036 (if (simula-context)
1037 (goto-char (1- (match-end 0)))
1038 (if (looking-at "\\<begin\\>")
1040 (goto-char (1- (match-end 0)))
1042 (while (natnump level
)
1043 (re-search-forward "\\<begin\\>\\|\\<end\\>")
1045 (if (not (simula-context))
1046 (setq level
(if (memq (following-char) '(?e ?E
))
1049 (backward-word -
1)))
1050 (goto-char (1- (match-end 0)))
1051 (throw 'exit t
)))))))
1054 (defun simula-install-standard-abbrevs ()
1055 "Define Simula keywords, procedures and classes in local abbrev table."
1056 ;; procedure and class names are as of the SIMULA 87 standard.
1058 (mapcar (function (lambda (args)
1059 (apply 'define-abbrev simula-mode-abbrev-table args
)))
1060 '(("abs" "Abs" simula-expand-stdproc
)
1061 ("accum" "Accum" simula-expand-stdproc
)
1062 ("activate" "ACTIVATE" simula-expand-keyword
)
1063 ("addepsilon" "AddEpsilon" simula-expand-stdproc
)
1064 ("after" "AFTER" simula-expand-keyword
)
1065 ("and" "AND" simula-expand-keyword
)
1066 ("arccos" "ArcCos" simula-expand-stdproc
)
1067 ("arcsin" "ArcSin" simula-expand-stdproc
)
1068 ("arctan" "ArcTan" simula-expand-stdproc
)
1069 ("arctan2" "ArcTan2" simula-expand-stdproc
)
1070 ("array" "ARRAY" simula-expand-keyword
)
1071 ("at" "AT" simula-expand-keyword
)
1072 ("before" "BEFORE" simula-expand-keyword
)
1073 ("begin" "BEGIN" simula-expand-keyword
)
1074 ("blanks" "Blanks" simula-expand-stdproc
)
1075 ("boolean" "BOOLEAN" simula-expand-keyword
)
1076 ("breakoutimage" "BreakOutImage" simula-expand-stdproc
)
1077 ("bytefile" "ByteFile" simula-expand-stdproc
)
1078 ("call" "Call" simula-expand-stdproc
)
1079 ("cancel" "Cancel" simula-expand-stdproc
)
1080 ("cardinal" "Cardinal" simula-expand-stdproc
)
1081 ("char" "Char" simula-expand-stdproc
)
1082 ("character" "CHARACTER" simula-expand-keyword
)
1083 ("checkpoint" "CheckPoint" simula-expand-stdproc
)
1084 ("class" "CLASS" simula-expand-keyword
)
1085 ("clear" "Clear" simula-expand-stdproc
)
1086 ("clocktime" "ClockTime" simula-expand-stdproc
)
1087 ("close" "Close" simula-expand-stdproc
)
1088 ("comment" "COMMENT" simula-expand-keyword
)
1089 ("constant" "Constant" simula-expand-stdproc
)
1090 ("copy" "Copy" simula-expand-stdproc
)
1091 ("cos" "Cos" simula-expand-stdproc
)
1092 ("cosh" "CosH" simula-expand-stdproc
)
1093 ("cotan" "CoTan" simula-expand-stdproc
)
1094 ("cputime" "CpuTime" simula-expand-stdproc
)
1095 ("current" "Current" simula-expand-stdproc
)
1096 ("datetime" "DateTime" simula-expand-stdproc
)
1097 ("decimalmark" "DecimalMark" simula-expand-stdproc
)
1098 ("delay" "DELAY" simula-expand-keyword
)
1099 ("deleteimage" "DeleteImage" simula-expand-stdproc
)
1100 ("detach" "Detach" simula-expand-stdproc
)
1101 ("digit" "Digit" simula-expand-stdproc
)
1102 ("directbytefile" "DirectByteFile" simula-expand-stdproc
)
1103 ("directfile" "DirectFile" simula-expand-stdproc
)
1104 ("discrete" "Discrete" simula-expand-stdproc
)
1105 ("do" "DO" simula-expand-keyword
)
1106 ("downcase" "Downcase" simula-expand-stdproc
)
1107 ("draw" "Draw" simula-expand-stdproc
)
1108 ("eject" "Eject" simula-expand-stdproc
)
1109 ("else" "ELSE" simula-electric-keyword
)
1110 ("empty" "Empty" simula-expand-stdproc
)
1111 ("end" "END" simula-electric-keyword
)
1112 ("endfile" "Endfile" simula-expand-stdproc
)
1113 ("entier" "Entier" simula-expand-stdproc
)
1114 ("eq" "EQ" simula-expand-keyword
)
1115 ("eqv" "EQV" simula-expand-keyword
)
1116 ("erlang" "Erlang" simula-expand-stdproc
)
1117 ("error" "Error" simula-expand-stdproc
)
1118 ("evtime" "EvTime" simula-expand-stdproc
)
1119 ("exp" "Exp" simula-expand-stdproc
)
1120 ("external" "EXTERNAL" simula-expand-keyword
)
1121 ("false" "FALSE" simula-expand-keyword
)
1122 ("field" "Field" simula-expand-stdproc
)
1123 ("file" "File" simula-expand-stdproc
)
1124 ("first" "First" simula-expand-stdproc
)
1125 ("follow" "Follow" simula-expand-stdproc
)
1126 ("for" "FOR" simula-expand-keyword
)
1127 ("ge" "GE" simula-expand-keyword
)
1128 ("getchar" "GetChar" simula-expand-stdproc
)
1129 ("getfrac" "GetFrac" simula-expand-stdproc
)
1130 ("getint" "GetInt" simula-expand-stdproc
)
1131 ("getreal" "GetReal" simula-expand-stdproc
)
1132 ("go" "GO" simula-expand-keyword
)
1133 ("goto" "GOTO" simula-expand-keyword
)
1134 ("gt" "GT" simula-expand-keyword
)
1135 ("head" "Head" simula-expand-stdproc
)
1136 ("hidden" "HIDDEN" simula-expand-keyword
)
1137 ("histd" "HistD" simula-expand-stdproc
)
1138 ("histo" "Histo" simula-expand-stdproc
)
1139 ("hold" "Hold" simula-expand-stdproc
)
1140 ("idle" "Idle" simula-expand-stdproc
)
1141 ("if" "IF" simula-expand-keyword
)
1142 ("image" "Image" simula-expand-stdproc
)
1143 ("imagefile" "ImageFile" simula-expand-stdproc
)
1144 ("imp" "IMP" simula-expand-keyword
)
1145 ("in" "IN" simula-expand-keyword
)
1146 ("inbyte" "InByte" simula-expand-stdproc
)
1147 ("inbytefile" "InByteFile" simula-expand-stdproc
)
1148 ("inchar" "InChar" simula-expand-stdproc
)
1149 ("infile" "InFile" simula-expand-stdproc
)
1150 ("infrac" "InFrac" simula-expand-stdproc
)
1151 ("inimage" "InImage" simula-expand-stdproc
)
1152 ("inint" "InInt" simula-expand-stdproc
)
1153 ("inner" "INNER" simula-expand-keyword
)
1154 ("inreal" "InReal" simula-expand-stdproc
)
1155 ("inrecord" "InRecord" simula-expand-stdproc
)
1156 ("inspect" "INSPECT" simula-expand-keyword
)
1157 ("integer" "INTEGER" simula-expand-keyword
)
1158 ("intext" "InText" simula-expand-stdproc
)
1159 ("into" "Into" simula-expand-stdproc
)
1160 ("is" "IS" simula-expand-keyword
)
1161 ("isochar" "ISOChar" simula-expand-stdproc
)
1162 ("isopen" "IsOpen" simula-expand-stdproc
)
1163 ("isorank" "ISORank" simula-expand-stdproc
)
1164 ("label" "LABEL" simula-expand-keyword
)
1165 ("last" "Last" simula-expand-stdproc
)
1166 ("lastitem" "LastItem" simula-expand-stdproc
)
1167 ("lastloc" "LastLoc" simula-expand-stdproc
)
1168 ("le" "LE" simula-expand-keyword
)
1169 ("length" "Length" simula-expand-stdproc
)
1170 ("letter" "Letter" simula-expand-stdproc
)
1171 ("line" "Line" simula-expand-stdproc
)
1172 ("linear" "Linear" simula-expand-stdproc
)
1173 ("linesperpage" "LinesPerPage" simula-expand-stdproc
)
1174 ("link" "Link" simula-expand-stdproc
)
1175 ("linkage" "Linkage" simula-expand-stdproc
)
1176 ("ln" "Ln" simula-expand-stdproc
)
1177 ("locate" "Locate" simula-expand-stdproc
)
1178 ("location" "Location" simula-expand-stdproc
)
1179 ("lock" "Lock" simula-expand-stdproc
)
1180 ("locked" "Locked" simula-expand-stdproc
)
1181 ("log10" "Log10" simula-expand-stdproc
)
1182 ("long" "LONG" simula-expand-keyword
)
1183 ("lowcase" "LowCase" simula-expand-stdproc
)
1184 ("lowerbound" "LowerBound" simula-expand-stdproc
)
1185 ("lowten" "LowTen" simula-expand-stdproc
)
1186 ("lt" "LT" simula-expand-keyword
)
1187 ("main" "Main" simula-expand-stdproc
)
1188 ("max" "Max" simula-expand-stdproc
)
1189 ("maxint" "MaxInt" simula-expand-stdproc
)
1190 ("maxlongreal" "MaxLongReal" simula-expand-stdproc
)
1191 ("maxloc" "MaxLoc" simula-expand-stdproc
)
1192 ("maxrank" "MaxRank" simula-expand-stdproc
)
1193 ("maxreal" "MaxReal" simula-expand-stdproc
)
1194 ("min" "Min" simula-expand-stdproc
)
1195 ("minint" "MinInt" simula-expand-stdproc
)
1196 ("minlongreal" "MinLongReal" simula-expand-stdproc
)
1197 ("minrank" "MinRank" simula-expand-stdproc
)
1198 ("minreal" "MinReal" simula-expand-stdproc
)
1199 ("mod" "Mod" simula-expand-stdproc
)
1200 ("more" "More" simula-expand-stdproc
)
1201 ("name" "NAME" simula-expand-keyword
)
1202 ("ne" "NE" simula-expand-keyword
)
1203 ("negexp" "NegExp" simula-expand-stdproc
)
1204 ("new" "NEW" simula-expand-keyword
)
1205 ("nextev" "NextEv" simula-expand-stdproc
)
1206 ("none" "NONE" simula-expand-keyword
)
1207 ("normal" "Normal" simula-expand-stdproc
)
1208 ("not" "NOT" simula-expand-keyword
)
1209 ("notext" "NOTEXT" simula-expand-keyword
)
1210 ("open" "Open" simula-expand-stdproc
)
1211 ("or" "OR" simula-expand-keyword
)
1212 ("otherwise" "OTHERWISE" simula-electric-keyword
)
1213 ("out" "Out" simula-expand-stdproc
)
1214 ("outbyte" "OutByte" simula-expand-stdproc
)
1215 ("outbytefile" "OutByteFile" simula-expand-stdproc
)
1216 ("outchar" "OutChar" simula-expand-stdproc
)
1217 ("outfile" "OutFile" simula-expand-stdproc
)
1218 ("outfix" "OutFix" simula-expand-stdproc
)
1219 ("outfrac" "OutFrac" simula-expand-stdproc
)
1220 ("outimage" "OutImage" simula-expand-stdproc
)
1221 ("outint" "OutInt" simula-expand-stdproc
)
1222 ("outreal" "OutReal" simula-expand-stdproc
)
1223 ("outrecord" "OutRecord" simula-expand-stdproc
)
1224 ("outtext" "OutText" simula-expand-stdproc
)
1225 ("page" "Page" simula-expand-stdproc
)
1226 ("passivate" "Passivate" simula-expand-stdproc
)
1227 ("poisson" "Poisson" simula-expand-stdproc
)
1228 ("pos" "Pos" simula-expand-stdproc
)
1229 ("precede" "Precede" simula-expand-stdproc
)
1230 ("pred" "Pred" simula-expand-stdproc
)
1231 ("prev" "Prev" simula-expand-stdproc
)
1232 ("printfile" "PrintFile" simula-expand-stdproc
)
1233 ("prior" "PRIOR" simula-expand-keyword
)
1234 ("procedure" "PROCEDURE" simula-expand-keyword
)
1235 ("process" "Process" simula-expand-stdproc
)
1236 ("protected" "PROTECTED" simula-expand-keyword
)
1237 ("putchar" "PutChar" simula-expand-stdproc
)
1238 ("putfix" "PutFix" simula-expand-stdproc
)
1239 ("putfrac" "PutFrac" simula-expand-stdproc
)
1240 ("putint" "PutInt" simula-expand-stdproc
)
1241 ("putreal" "PutReal" simula-expand-stdproc
)
1242 ("qua" "QUA" simula-expand-keyword
)
1243 ("randint" "RandInt" simula-expand-stdproc
)
1244 ("rank" "Rank" simula-expand-stdproc
)
1245 ("reactivate" "REACTIVATE" simula-expand-keyword
)
1246 ("real" "REAL" simula-expand-keyword
)
1247 ("ref" "REF" simula-expand-keyword
)
1248 ("resume" "Resume" simula-expand-stdproc
)
1249 ("setaccess" "SetAccess" simula-expand-stdproc
)
1250 ("setpos" "SetPos" simula-expand-stdproc
)
1251 ("short" "SHORT" simula-expand-keyword
)
1252 ("sign" "Sign" simula-expand-stdproc
)
1253 ("simset" "SimSet" simula-expand-stdproc
)
1254 ("simulaid" "SimulaId" simula-expand-stdproc
)
1255 ("simulation" "Simulation" simula-expand-stdproc
)
1256 ("sin" "Sin" simula-expand-stdproc
)
1257 ("sinh" "SinH" simula-expand-stdproc
)
1258 ("sourceline" "SourceLine" simula-expand-stdproc
)
1259 ("spacing" "Spacing" simula-expand-stdproc
)
1260 ("sqrt" "Sqrt" simula-expand-stdproc
)
1261 ("start" "Start" simula-expand-stdproc
)
1262 ("step" "STEP" simula-expand-keyword
)
1263 ("strip" "Strip" simula-expand-stdproc
)
1264 ("sub" "Sub" simula-expand-stdproc
)
1265 ("subepsilon" "SubEpsilon" simula-expand-stdproc
)
1266 ("suc" "Suc" simula-expand-stdproc
)
1267 ("switch" "SWITCH" simula-expand-keyword
)
1268 ("sysin" "SysIn" simula-expand-stdproc
)
1269 ("sysout" "SysOut" simula-expand-stdproc
)
1270 ("tan" "Tan" simula-expand-stdproc
)
1271 ("tanh" "TanH" simula-expand-stdproc
)
1272 ("terminate_program" "Terminate_Program" simula-expand-stdproc
)
1273 ("terminated" "Terminated" simula-expand-stdproc
)
1274 ("text" "TEXT" simula-expand-keyword
)
1275 ("then" "THEN" simula-electric-keyword
)
1276 ("this" "THIS" simula-expand-keyword
)
1277 ("time" "Time" simula-expand-stdproc
)
1278 ("to" "TO" simula-expand-keyword
)
1279 ("true" "TRUE" simula-expand-keyword
)
1280 ("uniform" "Uniform" simula-expand-stdproc
)
1281 ("unlock" "Unlock" simula-expand-stdproc
)
1282 ("until" "UNTIL" simula-expand-keyword
)
1283 ("upcase" "Upcase" simula-expand-stdproc
)
1284 ("upperbound" "UpperBound" simula-expand-stdproc
)
1285 ("value" "VALUE" simula-expand-keyword
)
1286 ("virtual" "VIRTUAL" simula-expand-keyword
)
1287 ("wait" "Wait" simula-expand-stdproc
)
1288 ("when" "WHEN" simula-electric-keyword
)
1289 ("while" "WHILE" simula-expand-keyword
))))
1291 ;;; simula.el ends here