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55535639 | 1 | ;;; thingatpt.el --- get the `thing' at point |
1a2b6c52 | 2 | |
95df8112 | 3 | ;; Copyright (C) 1991-1998, 2000-2011 Free Software Foundation, Inc. |
1a2b6c52 RS |
4 | |
5 | ;; Author: Mike Williams <mikew@gopher.dosli.govt.nz> | |
6254fc9f | 6 | ;; Maintainer: FSF |
b7f66977 | 7 | ;; Keywords: extensions, matching, mouse |
1a2b6c52 | 8 | ;; Created: Thu Mar 28 13:48:23 1991 |
1a2b6c52 RS |
9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
eb3fa2cf | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
1a2b6c52 | 13 | ;; it under the terms of the GNU General Public License as published by |
eb3fa2cf GM |
14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
1a2b6c52 RS |
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 | ||
eb3fa2cf GM |
22 | ;; You should have received a copy of the GNU General Public License |
23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
24 | ||
69f9ba7e | 25 | ;;; Commentary: |
b578f267 | 26 | |
c851323f RS |
27 | ;; This file provides routines for getting the "thing" at the location of |
28 | ;; point, whatever that "thing" happens to be. The "thing" is defined by | |
7a8f27db | 29 | ;; its beginning and end positions in the buffer. |
1a2b6c52 RS |
30 | ;; |
31 | ;; The function bounds-of-thing-at-point finds the beginning and end | |
c851323f | 32 | ;; positions by moving first forward to the end of the "thing", and then |
1a2b6c52 | 33 | ;; backwards to the beginning. By default, it uses the corresponding |
c851323f | 34 | ;; forward-"thing" operator (eg. forward-word, forward-line). |
1a2b6c52 RS |
35 | ;; |
36 | ;; Special cases are allowed for using properties associated with the named | |
f1180544 | 37 | ;; "thing": |
1a2b6c52 | 38 | ;; |
c851323f | 39 | ;; forward-op Function to call to skip forward over a "thing" (or |
1a2b6c52 | 40 | ;; with a negative argument, backward). |
f1180544 | 41 | ;; |
c851323f RS |
42 | ;; beginning-op Function to call to skip to the beginning of a "thing". |
43 | ;; end-op Function to call to skip to the end of a "thing". | |
1a2b6c52 RS |
44 | ;; |
45 | ;; Reliance on existing operators means that many `things' can be accessed | |
46 | ;; without further code: eg. | |
47 | ;; (thing-at-point 'line) | |
48 | ;; (thing-at-point 'page) | |
49 | ||
b578f267 | 50 | ;;; Code: |
1a2b6c52 RS |
51 | |
52 | (provide 'thingatpt) | |
53 | ||
b578f267 | 54 | ;; Basic movement |
1a2b6c52 RS |
55 | |
56 | ;;;###autoload | |
c851323f | 57 | (defun forward-thing (thing &optional n) |
2a59b30d | 58 | "Move forward to the end of the Nth next THING." |
c851323f RS |
59 | (let ((forward-op (or (get thing 'forward-op) |
60 | (intern-soft (format "forward-%s" thing))))) | |
6254fc9f | 61 | (if (functionp forward-op) |
c851323f RS |
62 | (funcall forward-op (or n 1)) |
63 | (error "Can't determine how to move over a %s" thing)))) | |
1a2b6c52 | 64 | |
b578f267 | 65 | ;; General routines |
1a2b6c52 RS |
66 | |
67 | ;;;###autoload | |
c851323f RS |
68 | (defun bounds-of-thing-at-point (thing) |
69 | "Determine the start and end buffer locations for the THING at point. | |
70 | THING is a symbol which specifies the kind of syntactic entity you want. | |
71 | Possibilities include `symbol', `list', `sexp', `defun', `filename', `url', | |
baef4cbe | 72 | `email', `word', `sentence', `whitespace', `line', `page' and others. |
c851323f RS |
73 | |
74 | See the file `thingatpt.el' for documentation on how to define | |
75 | a symbol as a valid THING. | |
76 | ||
77 | The value is a cons cell (START . END) giving the start and end positions | |
78 | of the textual entity that was found." | |
d9cc804b RS |
79 | (if (get thing 'bounds-of-thing-at-point) |
80 | (funcall (get thing 'bounds-of-thing-at-point)) | |
81 | (let ((orig (point))) | |
82 | (condition-case nil | |
83 | (save-excursion | |
84 | ;; Try moving forward, then back. | |
2a59b30d SM |
85 | (funcall ;; First move to end. |
86 | (or (get thing 'end-op) | |
87 | (lambda () (forward-thing thing 1)))) | |
88 | (funcall ;; Then move to beg. | |
89 | (or (get thing 'beginning-op) | |
90 | (lambda () (forward-thing thing -1)))) | |
91 | (let ((beg (point))) | |
f278f87f | 92 | (if (<= beg orig) |
d9cc804b RS |
93 | ;; If that brings us all the way back to ORIG, |
94 | ;; it worked. But END may not be the real end. | |
95 | ;; So find the real end that corresponds to BEG. | |
f278f87f | 96 | ;; FIXME: in which cases can `real-end' differ from `end'? |
d9cc804b | 97 | (let ((real-end |
f1180544 JB |
98 | (progn |
99 | (funcall | |
100 | (or (get thing 'end-op) | |
2a59b30d | 101 | (lambda () (forward-thing thing 1)))) |
d9cc804b | 102 | (point)))) |
f278f87f SM |
103 | (when (and (<= orig real-end) (< beg real-end)) |
104 | (cons beg real-end))) | |
d9cc804b RS |
105 | (goto-char orig) |
106 | ;; Try a second time, moving backward first and then forward, | |
107 | ;; so that we can find a thing that ends at ORIG. | |
2a59b30d SM |
108 | (funcall ;; First, move to beg. |
109 | (or (get thing 'beginning-op) | |
110 | (lambda () (forward-thing thing -1)))) | |
111 | (funcall ;; Then move to end. | |
112 | (or (get thing 'end-op) | |
113 | (lambda () (forward-thing thing 1)))) | |
114 | (let ((end (point)) | |
115 | (real-beg | |
f1180544 JB |
116 | (progn |
117 | (funcall | |
118 | (or (get thing 'beginning-op) | |
2a59b30d | 119 | (lambda () (forward-thing thing -1)))) |
d9cc804b | 120 | (point)))) |
f278f87f | 121 | (if (and (<= real-beg orig) (<= orig end) (< real-beg end)) |
d9cc804b RS |
122 | (cons real-beg end)))))) |
123 | (error nil))))) | |
1a2b6c52 RS |
124 | |
125 | ;;;###autoload | |
c851323f RS |
126 | (defun thing-at-point (thing) |
127 | "Return the THING at point. | |
128 | THING is a symbol which specifies the kind of syntactic entity you want. | |
129 | Possibilities include `symbol', `list', `sexp', `defun', `filename', `url', | |
baef4cbe | 130 | `email', `word', `sentence', `whitespace', `line', `page' and others. |
c851323f RS |
131 | |
132 | See the file `thingatpt.el' for documentation on how to define | |
133 | a symbol as a valid THING." | |
d9cc804b RS |
134 | (if (get thing 'thing-at-point) |
135 | (funcall (get thing 'thing-at-point)) | |
136 | (let ((bounds (bounds-of-thing-at-point thing))) | |
f1180544 | 137 | (if bounds |
d9cc804b | 138 | (buffer-substring (car bounds) (cdr bounds)))))) |
1a2b6c52 | 139 | |
b578f267 | 140 | ;; Go to beginning/end |
1a2b6c52 | 141 | |
c851323f RS |
142 | (defun beginning-of-thing (thing) |
143 | (let ((bounds (bounds-of-thing-at-point thing))) | |
144 | (or bounds (error "No %s here" thing)) | |
1a2b6c52 RS |
145 | (goto-char (car bounds)))) |
146 | ||
c851323f RS |
147 | (defun end-of-thing (thing) |
148 | (let ((bounds (bounds-of-thing-at-point thing))) | |
149 | (or bounds (error "No %s here" thing)) | |
1a2b6c52 RS |
150 | (goto-char (cdr bounds)))) |
151 | ||
f1180544 | 152 | ;; Special cases |
1a2b6c52 | 153 | |
f1180544 | 154 | ;; Lines |
9f5c7ace RS |
155 | |
156 | ;; bolp will be false when you click on the last line in the buffer | |
157 | ;; and it has no final newline. | |
158 | ||
159 | (put 'line 'beginning-op | |
2a59b30d | 160 | (lambda () (if (bolp) (forward-line -1) (beginning-of-line)))) |
9f5c7ace | 161 | |
f1180544 | 162 | ;; Sexps |
1a2b6c52 RS |
163 | |
164 | (defun in-string-p () | |
165 | (let ((orig (point))) | |
166 | (save-excursion | |
167 | (beginning-of-defun) | |
168 | (nth 3 (parse-partial-sexp (point) orig))))) | |
169 | ||
170 | (defun end-of-sexp () | |
ce8fb8aa | 171 | (let ((char-syntax (char-syntax (char-after)))) |
1a2b6c52 RS |
172 | (if (or (eq char-syntax ?\)) |
173 | (and (eq char-syntax ?\") (in-string-p))) | |
174 | (forward-char 1) | |
175 | (forward-sexp 1)))) | |
176 | ||
177 | (put 'sexp 'end-op 'end-of-sexp) | |
178 | ||
6f0e09d4 | 179 | (defun beginning-of-sexp () |
ce8fb8aa | 180 | (let ((char-syntax (char-syntax (char-before)))) |
6f0e09d4 RS |
181 | (if (or (eq char-syntax ?\() |
182 | (and (eq char-syntax ?\") (in-string-p))) | |
183 | (forward-char -1) | |
184 | (forward-sexp -1)))) | |
185 | ||
186 | (put 'sexp 'beginning-op 'beginning-of-sexp) | |
187 | ||
f1180544 | 188 | ;; Lists |
1a2b6c52 | 189 | |
965b9376 CY |
190 | (put 'list 'bounds-of-thing-at-point 'thing-at-point-bounds-of-list-at-point) |
191 | ||
192 | (defun thing-at-point-bounds-of-list-at-point () | |
193 | (save-excursion | |
194 | (let ((opoint (point)) | |
195 | (beg (condition-case nil | |
196 | (progn (up-list -1) | |
197 | (point)) | |
198 | (error nil)))) | |
199 | (condition-case nil | |
200 | (if beg | |
201 | (progn (forward-sexp) | |
202 | (cons beg (point))) | |
203 | ;; Are we are at the beginning of a top-level sexp? | |
204 | (forward-sexp) | |
205 | (let ((end (point))) | |
206 | (backward-sexp) | |
207 | (if (>= opoint (point)) | |
208 | (cons opoint end)))) | |
209 | (error nil))))) | |
1a2b6c52 | 210 | |
e8974c48 DA |
211 | ;; Defuns |
212 | ||
213 | (put 'defun 'beginning-op 'beginning-of-defun) | |
214 | (put 'defun 'end-op 'end-of-defun) | |
215 | (put 'defun 'forward-op 'end-of-defun) | |
216 | ||
4d61e7d5 | 217 | ;; Filenames and URLs www.com/foo%32bar |
1a2b6c52 | 218 | |
839aacc9 | 219 | (defvar thing-at-point-file-name-chars "-~/[:alnum:]_.${}#%,:" |
1a2b6c52 RS |
220 | "Characters allowable in filenames.") |
221 | ||
f1180544 | 222 | (put 'filename 'end-op |
839aacc9 DL |
223 | (lambda () |
224 | (re-search-forward (concat "\\=[" thing-at-point-file-name-chars "]*") | |
225 | nil t))) | |
1a2b6c52 | 226 | (put 'filename 'beginning-op |
839aacc9 DL |
227 | (lambda () |
228 | (if (re-search-backward (concat "[^" thing-at-point-file-name-chars "]") | |
229 | nil t) | |
230 | (forward-char) | |
231 | (goto-char (point-min))))) | |
c851323f | 232 | |
d9cc804b | 233 | (defvar thing-at-point-url-path-regexp |
42986283 | 234 | "[^]\t\n \"'<>[^`{}]*[^]\t\n \"'<>[^`{}.,;]+" |
0408f074 | 235 | "A regular expression probably matching the host and filename or e-mail part of a URL.") |
d9cc804b RS |
236 | |
237 | (defvar thing-at-point-short-url-regexp | |
238 | (concat "[-A-Za-z0-9.]+" thing-at-point-url-path-regexp) | |
239 | "A regular expression probably matching a URL without an access scheme. | |
240 | Hostname matching is stricter in this case than for | |
241 | ``thing-at-point-url-regexp''.") | |
242 | ||
1c1766c7 | 243 | (defvar thing-at-point-uri-schemes |
4f5d4668 | 244 | ;; Officials from http://www.iana.org/assignments/uri-schemes.html |
1c1766c7 MR |
245 | '("ftp://" "http://" "gopher://" "mailto:" "news:" "nntp:" |
246 | "telnet://" "wais://" "file:/" "prospero:" "z39.50s:" "z39.50r:" | |
247 | "cid:" "mid:" "vemmi:" "service:" "imap:" "nfs:" "acap:" "rtsp:" | |
248 | "tip:" "pop:" "data:" "dav:" "opaquelocktoken:" "sip:" "tel:" "fax:" | |
249 | "modem:" "ldap:" "https://" "soap.beep:" "soap.beeps:" "urn:" "go:" | |
250 | "afs:" "tn3270:" "mailserver:" | |
4f5d4668 RS |
251 | "crid:" "dict:" "dns:" "dtn:" "h323:" "im:" "info:" "ipp:" |
252 | "iris.beep:" "mtqp:" "mupdate:" "pres:" "sips:" "snmp:" "tag:" | |
253 | "tftp:" "xmlrpc.beep:" "xmlrpc.beeps:" "xmpp:" | |
1c1766c7 | 254 | ;; Compatibility |
4f5d4668 | 255 | "snews:" "irc:" "mms://" "mmsh://") |
2a59b30d | 256 | "Uniform Resource Identifier (URI) Schemes.") |
1c1766c7 | 257 | |
d9cc804b | 258 | (defvar thing-at-point-url-regexp |
1c1766c7 MR |
259 | (concat "\\<\\(" (mapconcat 'identity thing-at-point-uri-schemes "\\|") "\\)" |
260 | thing-at-point-url-path-regexp) | |
d9cc804b RS |
261 | "A regular expression probably matching a complete URL.") |
262 | ||
263 | (defvar thing-at-point-markedup-url-regexp | |
264 | "<URL:[^>]+>" | |
265 | "A regular expression matching a URL marked up per RFC1738. | |
266 | This may contain whitespace (including newlines) .") | |
267 | ||
268 | (put 'url 'bounds-of-thing-at-point 'thing-at-point-bounds-of-url-at-point) | |
269 | (defun thing-at-point-bounds-of-url-at-point () | |
2a59b30d SM |
270 | (let ((strip (thing-at-point-looking-at |
271 | thing-at-point-markedup-url-regexp))) ;; (url "") short | |
272 | (if (or strip | |
883d1f4b | 273 | (thing-at-point-looking-at thing-at-point-url-regexp) |
d9cc804b | 274 | ;; Access scheme omitted? |
2a59b30d SM |
275 | ;; (setq short (thing-at-point-looking-at |
276 | ;; thing-at-point-short-url-regexp)) | |
277 | ) | |
d9cc804b RS |
278 | (let ((beginning (match-beginning 0)) |
279 | (end (match-end 0))) | |
2a59b30d SM |
280 | (when strip |
281 | (setq beginning (+ beginning 5)) | |
282 | (setq end (- end 1))) | |
d9cc804b RS |
283 | (cons beginning end))))) |
284 | ||
285 | (put 'url 'thing-at-point 'thing-at-point-url-at-point) | |
286 | (defun thing-at-point-url-at-point () | |
287 | "Return the URL around or before point. | |
340483df DL |
288 | |
289 | Search backwards for the start of a URL ending at or after point. If | |
290 | no URL found, return nil. The access scheme will be prepended if | |
291 | absent: \"mailto:\" if the string contains \"@\", \"ftp://\" if it | |
292 | starts with \"ftp\" and not \"ftp:/\", or \"http://\" by default." | |
293 | ||
d9cc804b RS |
294 | (let ((url "") short strip) |
295 | (if (or (setq strip (thing-at-point-looking-at | |
296 | thing-at-point-markedup-url-regexp)) | |
297 | (thing-at-point-looking-at thing-at-point-url-regexp) | |
298 | ;; Access scheme omitted? | |
299 | (setq short (thing-at-point-looking-at | |
300 | thing-at-point-short-url-regexp))) | |
301 | (progn | |
302 | (setq url (buffer-substring-no-properties (match-beginning 0) | |
303 | (match-end 0))) | |
304 | (and strip (setq url (substring url 5 -1))) ; Drop "<URL:" & ">" | |
305 | ;; strip whitespace | |
84841dd1 | 306 | (while (string-match "[ \t\n\r]+" url) |
d9cc804b | 307 | (setq url (replace-match "" t t url))) |
4f5d4668 RS |
308 | (and short (setq url (concat (cond ((string-match "^[a-zA-Z]+:" url) |
309 | ;; already has a URL scheme. | |
310 | "") | |
311 | ((string-match "@" url) | |
340483df DL |
312 | "mailto:") |
313 | ;; e.g. ftp.swiss... or ftp-swiss... | |
314 | ((string-match "^ftp" url) | |
315 | "ftp://") | |
316 | (t "http://")) | |
317 | url))) | |
d9cc804b RS |
318 | (if (string-equal "" url) |
319 | nil | |
320 | url))))) | |
321 | ||
322 | ;; The normal thingatpt mechanism doesn't work for complex regexps. | |
323 | ;; This should work for almost any regexp wherever we are in the | |
324 | ;; match. To do a perfect job for any arbitrary regexp would mean | |
325 | ;; testing every position before point. Regexp searches won't find | |
326 | ;; matches that straddle the start position so we search forwards once | |
327 | ;; and then back repeatedly and then back up a char at a time. | |
328 | ||
329 | (defun thing-at-point-looking-at (regexp) | |
330 | "Return non-nil if point is in or just after a match for REGEXP. | |
331 | Set the match data from the earliest such match ending at or after | |
332 | point." | |
333 | (save-excursion | |
334 | (let ((old-point (point)) match) | |
335 | (and (looking-at regexp) | |
336 | (>= (match-end 0) old-point) | |
337 | (setq match (point))) | |
338 | ;; Search back repeatedly from end of next match. | |
339 | ;; This may fail if next match ends before this match does. | |
340 | (re-search-forward regexp nil 'limit) | |
341 | (while (and (re-search-backward regexp nil t) | |
342 | (or (> (match-beginning 0) old-point) | |
343 | (and (looking-at regexp) ; Extend match-end past search start | |
344 | (>= (match-end 0) old-point) | |
345 | (setq match (point)))))) | |
346 | (if (not match) nil | |
347 | (goto-char match) | |
348 | ;; Back up a char at a time in case search skipped | |
349 | ;; intermediate match straddling search start pos. | |
350 | (while (and (not (bobp)) | |
351 | (progn (backward-char 1) (looking-at regexp)) | |
352 | (>= (match-end 0) old-point) | |
353 | (setq match (point)))) | |
354 | (goto-char match) | |
355 | (looking-at regexp))))) | |
356 | ||
a1c9b4d0 | 357 | (put 'url 'end-op |
2a59b30d SM |
358 | (lambda () |
359 | (let ((bounds (thing-at-point-bounds-of-url-at-point))) | |
360 | (if bounds | |
361 | (goto-char (cdr bounds)) | |
362 | (error "No URL here"))))) | |
c851323f | 363 | (put 'url 'beginning-op |
2a59b30d SM |
364 | (lambda () |
365 | (let ((bounds (thing-at-point-bounds-of-url-at-point))) | |
366 | (if bounds | |
367 | (goto-char (car bounds)) | |
368 | (error "No URL here"))))) | |
1a2b6c52 | 369 | |
baef4cbe KF |
370 | ;; Email addresses |
371 | (defvar thing-at-point-email-regexp | |
86265518 | 372 | "<?[-+_.~a-zA-Z][-+_.~:a-zA-Z0-9]*@[-.a-zA-Z0-9]+>?" |
baef4cbe KF |
373 | "A regular expression probably matching an email address. |
374 | This does not match the real name portion, only the address, optionally | |
375 | with angle brackets.") | |
376 | ||
377 | ;; Haven't set 'forward-op on 'email nor defined 'forward-email' because | |
378 | ;; not sure they're actually needed, and URL seems to skip them too. | |
379 | ;; Note that (end-of-thing 'email) and (beginning-of-thing 'email) | |
380 | ;; work automagically, though. | |
381 | ||
382 | (put 'email 'bounds-of-thing-at-point | |
383 | (lambda () | |
384 | (let ((thing (thing-at-point-looking-at thing-at-point-email-regexp))) | |
385 | (if thing | |
386 | (let ((beginning (match-beginning 0)) | |
387 | (end (match-end 0))) | |
388 | (cons beginning end)))))) | |
389 | ||
390 | (put 'email 'thing-at-point | |
391 | (lambda () | |
392 | (let ((boundary-pair (bounds-of-thing-at-point 'email))) | |
393 | (if boundary-pair | |
394 | (buffer-substring-no-properties | |
395 | (car boundary-pair) (cdr boundary-pair)))))) | |
396 | ||
f1180544 | 397 | ;; Whitespace |
1a2b6c52 | 398 | |
c851323f | 399 | (defun forward-whitespace (arg) |
1a2b6c52 | 400 | (interactive "p") |
f1180544 | 401 | (if (natnump arg) |
9e594a2e | 402 | (re-search-forward "[ \t]+\\|\n" nil 'move arg) |
c851323f | 403 | (while (< arg 0) |
9e594a2e | 404 | (if (re-search-backward "[ \t]+\\|\n" nil 'move) |
ec8bd86f | 405 | (or (eq (char-after (match-beginning 0)) ?\n) |
1a2b6c52 | 406 | (skip-chars-backward " \t"))) |
c851323f | 407 | (setq arg (1+ arg))))) |
1a2b6c52 | 408 | |
f1180544 | 409 | ;; Buffer |
1a2b6c52 | 410 | |
206eef6c SM |
411 | (put 'buffer 'end-op (lambda () (goto-char (point-max)))) |
412 | (put 'buffer 'beginning-op (lambda () (goto-char (point-min)))) | |
1a2b6c52 | 413 | |
f1180544 | 414 | ;; Symbols |
1a2b6c52 | 415 | |
c851323f | 416 | (defun forward-symbol (arg) |
1a2b6c52 | 417 | (interactive "p") |
f1180544 | 418 | (if (natnump arg) |
9e594a2e | 419 | (re-search-forward "\\(\\sw\\|\\s_\\)+" nil 'move arg) |
c851323f | 420 | (while (< arg 0) |
9e594a2e | 421 | (if (re-search-backward "\\(\\sw\\|\\s_\\)+" nil 'move) |
1a2b6c52 | 422 | (skip-syntax-backward "w_")) |
c851323f | 423 | (setq arg (1+ arg))))) |
1a2b6c52 | 424 | |
f1180544 | 425 | ;; Syntax blocks |
fde7326e RS |
426 | |
427 | (defun forward-same-syntax (&optional arg) | |
428 | (interactive "p") | |
429 | (while (< arg 0) | |
f1180544 | 430 | (skip-syntax-backward |
ce8fb8aa | 431 | (char-to-string (char-syntax (char-before)))) |
fde7326e RS |
432 | (setq arg (1+ arg))) |
433 | (while (> arg 0) | |
ce8fb8aa | 434 | (skip-syntax-forward (char-to-string (char-syntax (char-after)))) |
fde7326e RS |
435 | (setq arg (1- arg)))) |
436 | ||
f1180544 | 437 | ;; Aliases |
1a2b6c52 RS |
438 | |
439 | (defun word-at-point () (thing-at-point 'word)) | |
440 | (defun sentence-at-point () (thing-at-point 'sentence)) | |
441 | ||
c851323f | 442 | (defun read-from-whole-string (str) |
2a59b30d | 443 | "Read a Lisp expression from STR. |
c851323f RS |
444 | Signal an error if the entire string was not used." |
445 | (let* ((read-data (read-from-string str)) | |
f1180544 | 446 | (more-left |
1a2b6c52 | 447 | (condition-case nil |
1b0d40de | 448 | ;; The call to `ignore' suppresses a compiler warning. |
7f1422bc | 449 | (progn (ignore (read-from-string (substring str (cdr read-data)))) |
1a2b6c52 RS |
450 | t) |
451 | (end-of-file nil)))) | |
452 | (if more-left | |
453 | (error "Can't read whole string") | |
454 | (car read-data)))) | |
455 | ||
f1180544 JB |
456 | (defun form-at-point (&optional thing pred) |
457 | (let ((sexp (condition-case nil | |
c851323f | 458 | (read-from-whole-string (thing-at-point (or thing 'sexp))) |
1a2b6c52 | 459 | (error nil)))) |
c851323f | 460 | (if (or (not pred) (funcall pred sexp)) sexp))) |
1a2b6c52 | 461 | |
be64abcf | 462 | ;;;###autoload |
de285f27 CY |
463 | (defun sexp-at-point () |
464 | "Return the sexp at point, or nil if none is found." | |
465 | (form-at-point 'sexp)) | |
be64abcf | 466 | ;;;###autoload |
2a59b30d | 467 | (defun symbol-at-point () |
de285f27 | 468 | "Return the symbol at point, or nil if none is found." |
2a59b30d SM |
469 | (let ((thing (thing-at-point 'symbol))) |
470 | (if thing (intern thing)))) | |
be64abcf | 471 | ;;;###autoload |
de285f27 CY |
472 | (defun number-at-point () |
473 | "Return the number at point, or nil if none is found." | |
474 | (form-at-point 'sexp 'numberp)) | |
be64abcf | 475 | ;;;###autoload |
de285f27 CY |
476 | (defun list-at-point () |
477 | "Return the Lisp list at point, or nil if none is found." | |
478 | (form-at-point 'list 'listp)) | |
1a2b6c52 | 479 | |
55535639 | 480 | ;;; thingatpt.el ends here |