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1a06eabd ER |
1 | ;;; icon.el --- mode for editing Icon code |
2 | ||
e5167999 ER |
3 | ;; Author: Chris Smith <convex!csmith> |
4 | ;; Created: 15 Feb 89 | |
5 | ;; Last-Modified: 06 Mar 1991 | |
fd7fa35a | 6 | ;; Keywords: languages |
a2535589 | 7 | |
a2535589 JA |
8 | ;; Copyright (C) 1989 Free Software Foundation, Inc. |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 14 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
15 | ;; any later version. |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
24 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | ||
e5167999 ER |
26 | ;;; Commentary: |
27 | ||
28 | ;; Note: use | |
29 | ;; (autoload 'icon-mode "icon" nil t) | |
30 | ;; (setq auto-mode-alist (cons '("\\.icn$" . icon-mode) auto-mode-alist)) | |
31 | ;; if not permanently installed in your emacs | |
32 | ||
33 | ;;; Code: | |
a2535589 JA |
34 | |
35 | (defvar icon-mode-abbrev-table nil | |
36 | "Abbrev table in use in Icon-mode buffers.") | |
37 | (define-abbrev-table 'icon-mode-abbrev-table ()) | |
38 | ||
39 | (defvar icon-mode-map () | |
40 | "Keymap used in Icon mode.") | |
41 | (if icon-mode-map | |
42 | () | |
43 | (setq icon-mode-map (make-sparse-keymap)) | |
44 | (define-key icon-mode-map "{" 'electric-icon-brace) | |
45 | (define-key icon-mode-map "}" 'electric-icon-brace) | |
46 | (define-key icon-mode-map "\e\C-h" 'mark-icon-function) | |
47 | (define-key icon-mode-map "\e\C-a" 'beginning-of-icon-defun) | |
48 | (define-key icon-mode-map "\e\C-e" 'end-of-icon-defun) | |
49 | (define-key icon-mode-map "\e\C-q" 'indent-icon-exp) | |
50 | (define-key icon-mode-map "\177" 'backward-delete-char-untabify) | |
51 | (define-key icon-mode-map "\t" 'icon-indent-command)) | |
52 | ||
53 | (defvar icon-mode-syntax-table nil | |
54 | "Syntax table in use in Icon-mode buffers.") | |
55 | ||
56 | (if icon-mode-syntax-table | |
57 | () | |
58 | (setq icon-mode-syntax-table (make-syntax-table)) | |
59 | (modify-syntax-entry ?\\ "\\" icon-mode-syntax-table) | |
60 | (modify-syntax-entry ?# "<" icon-mode-syntax-table) | |
61 | (modify-syntax-entry ?\n ">" icon-mode-syntax-table) | |
62 | (modify-syntax-entry ?$ "." icon-mode-syntax-table) | |
63 | (modify-syntax-entry ?/ "." icon-mode-syntax-table) | |
64 | (modify-syntax-entry ?* "." icon-mode-syntax-table) | |
65 | (modify-syntax-entry ?+ "." icon-mode-syntax-table) | |
66 | (modify-syntax-entry ?- "." icon-mode-syntax-table) | |
67 | (modify-syntax-entry ?= "." icon-mode-syntax-table) | |
68 | (modify-syntax-entry ?% "." icon-mode-syntax-table) | |
69 | (modify-syntax-entry ?< "." icon-mode-syntax-table) | |
70 | (modify-syntax-entry ?> "." icon-mode-syntax-table) | |
71 | (modify-syntax-entry ?& "." icon-mode-syntax-table) | |
72 | (modify-syntax-entry ?| "." icon-mode-syntax-table) | |
73 | (modify-syntax-entry ?\' "\"" icon-mode-syntax-table)) | |
74 | ||
75 | (defconst icon-indent-level 4 | |
76 | "*Indentation of Icon statements with respect to containing block.") | |
77 | (defconst icon-brace-imaginary-offset 0 | |
78 | "*Imagined indentation of a Icon open brace that actually follows a statement.") | |
79 | (defconst icon-brace-offset 0 | |
80 | "*Extra indentation for braces, compared with other text in same context.") | |
81 | (defconst icon-continued-statement-offset 4 | |
82 | "*Extra indent for lines not starting new statements.") | |
83 | (defconst icon-continued-brace-offset 0 | |
84 | "*Extra indent for substatements that start with open-braces. | |
85 | This is in addition to icon-continued-statement-offset.") | |
86 | ||
87 | (defconst icon-auto-newline nil | |
88 | "*Non-nil means automatically newline before and after braces | |
89 | inserted in Icon code.") | |
90 | ||
91 | (defconst icon-tab-always-indent t | |
92 | "*Non-nil means TAB in Icon mode should always reindent the current line, | |
93 | regardless of where in the line point is when the TAB command is used.") | |
94 | \f | |
95 | (defun icon-mode () | |
96 | "Major mode for editing Icon code. | |
97 | Expression and list commands understand all Icon brackets. | |
98 | Tab indents for Icon code. | |
99 | Paragraphs are separated by blank lines only. | |
100 | Delete converts tabs to spaces as it moves back. | |
101 | \\{icon-mode-map} | |
102 | Variables controlling indentation style: | |
103 | icon-tab-always-indent | |
104 | Non-nil means TAB in Icon mode should always reindent the current line, | |
105 | regardless of where in the line point is when the TAB command is used. | |
106 | icon-auto-newline | |
107 | Non-nil means automatically newline before and after braces | |
108 | inserted in Icon code. | |
109 | icon-indent-level | |
110 | Indentation of Icon statements within surrounding block. | |
111 | The surrounding block's indentation is the indentation | |
112 | of the line on which the open-brace appears. | |
113 | icon-continued-statement-offset | |
114 | Extra indentation given to a substatement, such as the | |
115 | then-clause of an if or body of a while. | |
116 | icon-continued-brace-offset | |
117 | Extra indentation given to a brace that starts a substatement. | |
073c9531 | 118 | This is in addition to `icon-continued-statement-offset'. |
a2535589 JA |
119 | icon-brace-offset |
120 | Extra indentation for line if it starts with an open brace. | |
121 | icon-brace-imaginary-offset | |
122 | An open brace following other text is treated as if it were | |
123 | this far to the right of the start of its line. | |
124 | ||
073c9531 JB |
125 | Turning on Icon mode calls the value of the variable `icon-mode-hook' |
126 | with no args, if that value is non-nil." | |
a2535589 JA |
127 | (interactive) |
128 | (kill-all-local-variables) | |
129 | (use-local-map icon-mode-map) | |
130 | (setq major-mode 'icon-mode) | |
131 | (setq mode-name "Icon") | |
132 | (setq local-abbrev-table icon-mode-abbrev-table) | |
133 | (set-syntax-table icon-mode-syntax-table) | |
134 | (make-local-variable 'paragraph-start) | |
135 | (setq paragraph-start (concat "^$\\|" page-delimiter)) | |
136 | (make-local-variable 'paragraph-separate) | |
137 | (setq paragraph-separate paragraph-start) | |
138 | (make-local-variable 'indent-line-function) | |
139 | (setq indent-line-function 'icon-indent-line) | |
140 | (make-local-variable 'require-final-newline) | |
141 | (setq require-final-newline t) | |
142 | (make-local-variable 'comment-start) | |
143 | (setq comment-start "# ") | |
144 | (make-local-variable 'comment-end) | |
145 | (setq comment-end "") | |
146 | (make-local-variable 'comment-column) | |
147 | (setq comment-column 32) | |
148 | (make-local-variable 'comment-start-skip) | |
149 | (setq comment-start-skip "# *") | |
150 | (make-local-variable 'comment-indent-hook) | |
151 | (setq comment-indent-hook 'icon-comment-indent) | |
152 | (run-hooks 'icon-mode-hook)) | |
153 | \f | |
073c9531 JB |
154 | ;; This is used by indent-for-comment to decide how much to |
155 | ;; indent a comment in Icon code based on its context. | |
a2535589 JA |
156 | (defun icon-comment-indent () |
157 | (if (looking-at "^#") | |
158 | 0 | |
159 | (save-excursion | |
160 | (skip-chars-backward " \t") | |
161 | (max (if (bolp) 0 (1+ (current-column))) | |
162 | comment-column)))) | |
163 | ||
164 | (defun electric-icon-brace (arg) | |
165 | "Insert character and correct line's indentation." | |
166 | (interactive "P") | |
167 | (let (insertpos) | |
168 | (if (and (not arg) | |
169 | (eolp) | |
170 | (or (save-excursion | |
171 | (skip-chars-backward " \t") | |
172 | (bolp)) | |
173 | (if icon-auto-newline | |
174 | (progn (icon-indent-line) (newline) t) | |
175 | nil))) | |
176 | (progn | |
177 | (insert last-command-char) | |
178 | (icon-indent-line) | |
179 | (if icon-auto-newline | |
180 | (progn | |
181 | (newline) | |
182 | ;; (newline) may have done auto-fill | |
183 | (setq insertpos (- (point) 2)) | |
184 | (icon-indent-line))) | |
185 | (save-excursion | |
186 | (if insertpos (goto-char (1+ insertpos))) | |
187 | (delete-char -1)))) | |
188 | (if insertpos | |
189 | (save-excursion | |
190 | (goto-char insertpos) | |
191 | (self-insert-command (prefix-numeric-value arg))) | |
192 | (self-insert-command (prefix-numeric-value arg))))) | |
193 | \f | |
194 | (defun icon-indent-command (&optional whole-exp) | |
195 | (interactive "P") | |
196 | "Indent current line as Icon code, or in some cases insert a tab character. | |
073c9531 JB |
197 | If `icon-tab-always-indent' is non-nil (the default), always indent current |
198 | line. Otherwise, indent the current line only if point is at the left margin | |
a2535589 JA |
199 | or in the line's indentation; otherwise insert a tab. |
200 | ||
073c9531 JB |
201 | A numeric argument, regardless of its value, means indent rigidly all the |
202 | lines of the expression starting after point so that this line becomes | |
203 | properly indented. The relative indentation among the lines of the | |
204 | expression are preserved." | |
a2535589 JA |
205 | (if whole-exp |
206 | ;; If arg, always indent this line as Icon | |
207 | ;; and shift remaining lines of expression the same amount. | |
208 | (let ((shift-amt (icon-indent-line)) | |
209 | beg end) | |
210 | (save-excursion | |
211 | (if icon-tab-always-indent | |
212 | (beginning-of-line)) | |
213 | (setq beg (point)) | |
214 | (forward-sexp 1) | |
215 | (setq end (point)) | |
216 | (goto-char beg) | |
217 | (forward-line 1) | |
218 | (setq beg (point))) | |
219 | (if (> end beg) | |
220 | (indent-code-rigidly beg end shift-amt "#"))) | |
221 | (if (and (not icon-tab-always-indent) | |
222 | (save-excursion | |
223 | (skip-chars-backward " \t") | |
224 | (not (bolp)))) | |
225 | (insert-tab) | |
226 | (icon-indent-line)))) | |
227 | ||
228 | (defun icon-indent-line () | |
229 | "Indent current line as Icon code. | |
230 | Return the amount the indentation changed by." | |
231 | (let ((indent (calculate-icon-indent nil)) | |
232 | beg shift-amt | |
233 | (case-fold-search nil) | |
234 | (pos (- (point-max) (point)))) | |
235 | (beginning-of-line) | |
236 | (setq beg (point)) | |
237 | (cond ((eq indent nil) | |
238 | (setq indent (current-indentation))) | |
239 | ((eq indent t) | |
240 | (setq indent (calculate-icon-indent-within-comment))) | |
241 | ((looking-at "[ \t]*#") | |
242 | (setq indent 0)) | |
243 | (t | |
244 | (skip-chars-forward " \t") | |
245 | (if (listp indent) (setq indent (car indent))) | |
246 | (cond ((and (looking-at "else\\b") | |
247 | (not (looking-at "else\\s_"))) | |
248 | (setq indent (save-excursion | |
249 | (icon-backward-to-start-of-if) | |
250 | (current-indentation)))) | |
251 | ((or (= (following-char) ?}) | |
252 | (looking-at "end\\b")) | |
253 | (setq indent (- indent icon-indent-level))) | |
254 | ((= (following-char) ?{) | |
255 | (setq indent (+ indent icon-brace-offset)))))) | |
256 | (skip-chars-forward " \t") | |
257 | (setq shift-amt (- indent (current-column))) | |
258 | (if (zerop shift-amt) | |
259 | (if (> (- (point-max) pos) (point)) | |
260 | (goto-char (- (point-max) pos))) | |
261 | (delete-region beg (point)) | |
262 | (indent-to indent) | |
263 | ;; If initial point was within line's indentation, | |
264 | ;; position after the indentation. Else stay at same point in text. | |
265 | (if (> (- (point-max) pos) (point)) | |
266 | (goto-char (- (point-max) pos)))) | |
267 | shift-amt)) | |
268 | ||
269 | (defun calculate-icon-indent (&optional parse-start) | |
270 | "Return appropriate indentation for current line as Icon code. | |
271 | In usual case returns an integer: the column to indent to. | |
272 | Returns nil if line starts inside a string, t if in a comment." | |
273 | (save-excursion | |
274 | (beginning-of-line) | |
275 | (let ((indent-point (point)) | |
276 | (case-fold-search nil) | |
277 | state | |
278 | containing-sexp | |
279 | toplevel) | |
280 | (if parse-start | |
281 | (goto-char parse-start) | |
282 | (setq toplevel (beginning-of-icon-defun))) | |
283 | (while (< (point) indent-point) | |
284 | (setq parse-start (point)) | |
285 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
286 | (setq containing-sexp (car (cdr state)))) | |
287 | (cond ((or (nth 3 state) (nth 4 state)) | |
288 | ;; return nil or t if should not change this line | |
289 | (nth 4 state)) | |
290 | ((and containing-sexp | |
291 | (/= (char-after containing-sexp) ?{)) | |
292 | ;; line is expression, not statement: | |
293 | ;; indent to just after the surrounding open. | |
294 | (goto-char (1+ containing-sexp)) | |
295 | (current-column)) | |
296 | (t | |
297 | (if toplevel | |
298 | ;; Outside any procedures. | |
299 | (progn (icon-backward-to-noncomment (point-min)) | |
300 | (if (icon-is-continuation-line) | |
301 | icon-continued-statement-offset 0)) | |
302 | ;; Statement level. | |
303 | (if (null containing-sexp) | |
304 | (progn (beginning-of-icon-defun) | |
305 | (setq containing-sexp (point)))) | |
306 | (goto-char indent-point) | |
307 | ;; Is it a continuation or a new statement? | |
308 | ;; Find previous non-comment character. | |
309 | (icon-backward-to-noncomment containing-sexp) | |
310 | ;; Now we get the answer. | |
311 | (if (icon-is-continuation-line) | |
312 | ;; This line is continuation of preceding line's statement; | |
313 | ;; indent icon-continued-statement-offset more than the | |
314 | ;; first line of the statement. | |
315 | (progn | |
316 | (icon-backward-to-start-of-continued-exp containing-sexp) | |
317 | (+ icon-continued-statement-offset (current-column) | |
318 | (if (save-excursion (goto-char indent-point) | |
319 | (skip-chars-forward " \t") | |
320 | (eq (following-char) ?{)) | |
321 | icon-continued-brace-offset 0))) | |
322 | ;; This line starts a new statement. | |
323 | ;; Position following last unclosed open. | |
324 | (goto-char containing-sexp) | |
325 | ;; Is line first statement after an open-brace? | |
326 | (or | |
327 | ;; If no, find that first statement and indent like it. | |
328 | (save-excursion | |
329 | (if (looking-at "procedure\\s ") | |
330 | (forward-sexp 3) | |
331 | (forward-char 1)) | |
332 | (while (progn (skip-chars-forward " \t\n") | |
333 | (looking-at "#")) | |
334 | ;; Skip over comments following openbrace. | |
335 | (forward-line 1)) | |
336 | ;; The first following code counts | |
337 | ;; if it is before the line we want to indent. | |
338 | (and (< (point) indent-point) | |
339 | (current-column))) | |
340 | ;; If no previous statement, | |
341 | ;; indent it relative to line brace is on. | |
342 | ;; For open brace in column zero, don't let statement | |
343 | ;; start there too. If icon-indent-level is zero, | |
344 | ;; use icon-brace-offset + icon-continued-statement-offset | |
345 | ;; instead. | |
346 | ;; For open-braces not the first thing in a line, | |
347 | ;; add in icon-brace-imaginary-offset. | |
348 | (+ (if (and (bolp) (zerop icon-indent-level)) | |
349 | (+ icon-brace-offset | |
350 | icon-continued-statement-offset) | |
351 | icon-indent-level) | |
352 | ;; Move back over whitespace before the openbrace. | |
353 | ;; If openbrace is not first nonwhite thing on the line, | |
354 | ;; add the icon-brace-imaginary-offset. | |
355 | (progn (skip-chars-backward " \t") | |
356 | (if (bolp) 0 icon-brace-imaginary-offset)) | |
357 | ;; Get initial indentation of the line we are on. | |
358 | (current-indentation)))))))))) | |
359 | ||
360 | ;; List of words to check for as the last thing on a line. | |
361 | ;; If cdr is t, next line is a continuation of the same statement, | |
362 | ;; if cdr is nil, next line starts a new (possibly indented) statement. | |
363 | ||
364 | (defconst icon-resword-alist | |
365 | '(("by" . t) ("case" . t) ("create") ("do") ("dynamic" . t) ("else") | |
366 | ("every" . t) ("if" . t) ("global" . t) ("initial" . t) | |
367 | ("link" . t) ("local" . t) ("of") ("record" . t) ("repeat" . t) | |
368 | ("static" . t) ("then") ("to" . t) ("until" . t) ("while" . t))) | |
369 | ||
370 | (defun icon-is-continuation-line () | |
371 | (let* ((ch (preceding-char)) | |
372 | (ch-syntax (char-syntax ch))) | |
373 | (if (eq ch-syntax ?w) | |
374 | (assoc (buffer-substring | |
375 | (progn (forward-word -1) (point)) | |
376 | (progn (forward-word 1) (point))) | |
377 | icon-resword-alist) | |
378 | (not (memq ch '(0 ?\; ?\} ?\{ ?\) ?\] ?\" ?\' ?\n)))))) | |
379 | ||
380 | (defun icon-backward-to-noncomment (lim) | |
381 | (let (opoint stop) | |
382 | (while (not stop) | |
383 | (skip-chars-backward " \t\n\f" lim) | |
384 | (setq opoint (point)) | |
385 | (beginning-of-line) | |
386 | (if (and (nth 5 (parse-partial-sexp (point) opoint)) | |
387 | (< lim (point))) | |
388 | (search-backward "#") | |
389 | (setq stop t))))) | |
390 | ||
391 | (defun icon-backward-to-start-of-continued-exp (lim) | |
392 | (if (memq (preceding-char) '(?\) ?\])) | |
393 | (forward-sexp -1)) | |
394 | (beginning-of-line) | |
395 | (skip-chars-forward " \t") | |
396 | (cond | |
397 | ((<= (point) lim) (goto-char (1+ lim))) | |
398 | ((not (icon-is-continued-line)) 0) | |
399 | ((and (eq (char-syntax (following-char)) ?w) | |
400 | (cdr | |
401 | (assoc (buffer-substring (point) | |
402 | (save-excursion (forward-word 1) (point))) | |
403 | icon-resword-alist))) 0) | |
404 | (t (end-of-line 0) (icon-backward-to-start-of-continued-exp lim)))) | |
405 | ||
406 | (defun icon-is-continued-line () | |
407 | (save-excursion | |
408 | (end-of-line 0) | |
409 | (icon-is-continuation-line))) | |
410 | ||
411 | (defun icon-backward-to-start-of-if (&optional limit) | |
073c9531 | 412 | "Move to the start of the last \"unbalanced\" if." |
a2535589 JA |
413 | (or limit (setq limit (save-excursion (beginning-of-icon-defun) (point)))) |
414 | (let ((if-level 1) | |
415 | (case-fold-search nil)) | |
416 | (while (not (zerop if-level)) | |
417 | (backward-sexp 1) | |
418 | (cond ((looking-at "else\\b") | |
419 | (setq if-level (1+ if-level))) | |
420 | ((looking-at "if\\b") | |
421 | (setq if-level (1- if-level))) | |
422 | ((< (point) limit) | |
423 | (setq if-level 0) | |
424 | (goto-char limit)))))) | |
425 | \f | |
426 | (defun mark-icon-function () | |
427 | "Put mark at end of Icon function, point at beginning." | |
428 | (interactive) | |
429 | (push-mark (point)) | |
430 | (end-of-icon-defun) | |
431 | (push-mark (point)) | |
432 | (beginning-of-line 0) | |
433 | (beginning-of-icon-defun)) | |
434 | ||
435 | (defun beginning-of-icon-defun () | |
436 | "Go to the start of the enclosing procedure; return t if at top level." | |
437 | (interactive) | |
438 | (if (re-search-backward "^procedure\\s \\|^end[ \t\n]" (point-min) 'move) | |
439 | (looking-at "e") | |
440 | t)) | |
441 | ||
442 | (defun end-of-icon-defun () | |
443 | (interactive) | |
444 | (if (not (bobp)) (forward-char -1)) | |
445 | (re-search-forward "\\(\\s \\|^\\)end\\(\\s \\|$\\)" (point-max) 'move) | |
446 | (forward-word -1) | |
447 | (forward-line 1)) | |
448 | \f | |
449 | (defun indent-icon-exp () | |
450 | "Indent each line of the Icon grouping following point." | |
451 | (interactive) | |
452 | (let ((indent-stack (list nil)) | |
453 | (contain-stack (list (point))) | |
454 | (case-fold-search nil) | |
455 | restart outer-loop-done inner-loop-done state ostate | |
456 | this-indent last-sexp | |
457 | at-else at-brace at-do | |
458 | (opoint (point)) | |
459 | (next-depth 0)) | |
460 | (save-excursion | |
461 | (forward-sexp 1)) | |
462 | (save-excursion | |
463 | (setq outer-loop-done nil) | |
464 | (while (and (not (eobp)) (not outer-loop-done)) | |
465 | (setq last-depth next-depth) | |
466 | ;; Compute how depth changes over this line | |
467 | ;; plus enough other lines to get to one that | |
468 | ;; does not end inside a comment or string. | |
469 | ;; Meanwhile, do appropriate indentation on comment lines. | |
470 | (setq innerloop-done nil) | |
471 | (while (and (not innerloop-done) | |
472 | (not (and (eobp) (setq outer-loop-done t)))) | |
473 | (setq ostate state) | |
474 | (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) | |
475 | nil nil state)) | |
476 | (setq next-depth (car state)) | |
477 | (if (and (car (cdr (cdr state))) | |
478 | (>= (car (cdr (cdr state))) 0)) | |
479 | (setq last-sexp (car (cdr (cdr state))))) | |
480 | (if (or (nth 4 ostate)) | |
481 | (icon-indent-line)) | |
482 | (if (or (nth 3 state)) | |
483 | (forward-line 1) | |
484 | (setq innerloop-done t))) | |
485 | (if (<= next-depth 0) | |
486 | (setq outer-loop-done t)) | |
487 | (if outer-loop-done | |
488 | nil | |
489 | (if (/= last-depth next-depth) | |
490 | (setq last-sexp nil)) | |
491 | (while (> last-depth next-depth) | |
492 | (setq indent-stack (cdr indent-stack) | |
493 | contain-stack (cdr contain-stack) | |
494 | last-depth (1- last-depth))) | |
495 | (while (< last-depth next-depth) | |
496 | (setq indent-stack (cons nil indent-stack) | |
497 | contain-stack (cons nil contain-stack) | |
498 | last-depth (1+ last-depth))) | |
499 | (if (null (car contain-stack)) | |
500 | (setcar contain-stack (or (car (cdr state)) | |
501 | (save-excursion (forward-sexp -1) | |
502 | (point))))) | |
503 | (forward-line 1) | |
504 | (skip-chars-forward " \t") | |
505 | (if (eolp) | |
506 | nil | |
507 | (if (and (car indent-stack) | |
508 | (>= (car indent-stack) 0)) | |
509 | ;; Line is on an existing nesting level. | |
510 | ;; Lines inside parens are handled specially. | |
511 | (if (/= (char-after (car contain-stack)) ?{) | |
512 | (setq this-indent (car indent-stack)) | |
513 | ;; Line is at statement level. | |
514 | ;; Is it a new statement? Is it an else? | |
515 | ;; Find last non-comment character before this line | |
516 | (save-excursion | |
517 | (setq at-else (looking-at "else\\W")) | |
518 | (setq at-brace (= (following-char) ?{)) | |
519 | (icon-backward-to-noncomment opoint) | |
520 | (if (icon-is-continuation-line) | |
521 | ;; Preceding line did not end in comma or semi; | |
522 | ;; indent this line icon-continued-statement-offset | |
523 | ;; more than previous. | |
524 | (progn | |
525 | (icon-backward-to-start-of-continued-exp (car contain-stack)) | |
526 | (setq this-indent | |
527 | (+ icon-continued-statement-offset (current-column) | |
528 | (if at-brace icon-continued-brace-offset 0)))) | |
529 | ;; Preceding line ended in comma or semi; | |
530 | ;; use the standard indent for this level. | |
531 | (if at-else | |
532 | (progn (icon-backward-to-start-of-if opoint) | |
533 | (setq this-indent (current-indentation))) | |
534 | (setq this-indent (car indent-stack)))))) | |
535 | ;; Just started a new nesting level. | |
536 | ;; Compute the standard indent for this level. | |
537 | (let ((val (calculate-icon-indent | |
538 | (if (car indent-stack) | |
539 | (- (car indent-stack)))))) | |
540 | (setcar indent-stack | |
541 | (setq this-indent val)))) | |
542 | ;; Adjust line indentation according to its contents | |
543 | (if (or (= (following-char) ?}) | |
544 | (looking-at "end\\b")) | |
545 | (setq this-indent (- this-indent icon-indent-level))) | |
546 | (if (= (following-char) ?{) | |
547 | (setq this-indent (+ this-indent icon-brace-offset))) | |
548 | ;; Put chosen indentation into effect. | |
549 | (or (= (current-column) this-indent) | |
550 | (progn | |
551 | (delete-region (point) (progn (beginning-of-line) (point))) | |
552 | (indent-to this-indent))) | |
553 | ;; Indent any comment following the text. | |
554 | (or (looking-at comment-start-skip) | |
555 | (if (re-search-forward comment-start-skip (save-excursion (end-of-line) (point)) t) | |
556 | (progn (indent-for-comment) (beginning-of-line)))))))))) | |
557 | ||
1a06eabd | 558 | ;;; icon.el ends here |