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