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c88ab9ce ER |
1 | ;;; rfc822.el --- hairy rfc822 parser for mail and news and suchlike |
2 | ||
9750e079 ER |
3 | ;; Copyright (C) 1986, 87, 1990 Free Software Foundation, Inc. |
4 | ||
4821e2af ER |
5 | ;; Author: Richard Mlynarik <mly@eddie.mit.edu> |
6 | ;; Maintainer: FSF | |
d7b4d18f | 7 | ;; Keywords: mail |
4821e2af | 8 | |
cedaf3aa RS |
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 | |
29add8b9 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
cedaf3aa RS |
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 | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
cedaf3aa | 25 | |
d9ecc911 ER |
26 | ;;; Commentary: |
27 | ||
28 | ;; Support functions for parsing RFC-822 headers, used by mail and news | |
29 | ;; modes. | |
30 | ||
4821e2af ER |
31 | ;;; Code: |
32 | ||
cedaf3aa RS |
33 | ;; uses address-start free, throws to address |
34 | (defun rfc822-bad-address (reason) | |
35 | (save-restriction | |
36 | (insert "_^_") | |
37 | (narrow-to-region address-start | |
38 | (if (re-search-forward "[,;]" nil t) | |
39 | (max (point-min) (1- (point))) | |
40 | (point-max))) | |
41 | ;; make the error string be suitable for inclusion in (...) | |
42 | (let ((losers '("\\" "(" ")" "\n"))) | |
43 | (while losers | |
44 | (goto-char (point-min)) | |
45 | (while (search-forward (car losers) nil t) | |
46 | (backward-char 1) | |
47 | (insert ?\\) | |
48 | (forward-char 1)) | |
49 | (setq losers (cdr losers)))) | |
50 | (goto-char (point-min)) (insert "(Unparsable address -- " | |
51 | reason | |
416916d4 | 52 | ": \"") |
cedaf3aa RS |
53 | (goto-char (point-max)) (insert "\")")) |
54 | (rfc822-nuke-whitespace) | |
55 | (throw 'address (buffer-substring address-start (point)))) | |
56 | ||
57 | (defun rfc822-nuke-whitespace (&optional leave-space) | |
58 | (let (ch) | |
59 | (while (cond ((eobp) | |
60 | nil) | |
61 | ((= (setq ch (following-char)) ?\() | |
62 | (forward-char 1) | |
63 | (while (if (eobp) | |
64 | (rfc822-bad-address "Unbalanced comment (...)") | |
65 | (/= (setq ch (following-char)) ?\))) | |
66 | (cond ((looking-at "[^()\\]+") | |
67 | (replace-match "")) | |
68 | ((= ch ?\() | |
69 | (rfc822-nuke-whitespace)) | |
70 | ((< (point) (1- (point-max))) | |
71 | (delete-char 2)) | |
72 | (t | |
73 | (rfc822-bad-address "orphaned backslash")))) | |
74 | ;; delete remaining "()" | |
75 | (forward-char -1) | |
76 | (delete-char 2) | |
77 | t) | |
78 | ((memq ch '(?\ ?\t ?\n)) | |
79 | (delete-region (point) | |
80 | (progn (skip-chars-forward " \t\n") (point))) | |
81 | t) | |
82 | (t | |
83 | nil))) | |
84 | (or (not leave-space) | |
85 | (eobp) | |
86 | (bobp) | |
87 | (= (preceding-char) ?\ ) | |
88 | (insert ?\ )))) | |
89 | ||
90 | (defun rfc822-looking-at (regex &optional leave-space) | |
91 | (if (cond ((stringp regex) | |
92 | (if (looking-at regex) | |
93 | (progn (goto-char (match-end 0)) | |
94 | t))) | |
95 | (t | |
96 | (if (and (not (eobp)) | |
97 | (= (following-char) regex)) | |
98 | (progn (forward-char 1) | |
99 | t)))) | |
100 | (let ((tem (match-data))) | |
101 | (rfc822-nuke-whitespace leave-space) | |
f6b4e0f4 | 102 | (set-match-data tem) |
cedaf3aa RS |
103 | t))) |
104 | ||
105 | (defun rfc822-snarf-word () | |
106 | ;; word is atom | quoted-string | |
107 | (cond ((= (following-char) ?\") | |
108 | ;; quoted-string | |
109 | (or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"") | |
110 | (rfc822-bad-address "Unterminated quoted string"))) | |
55872f3e | 111 | ((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+") |
cedaf3aa RS |
112 | ;; atom |
113 | ) | |
114 | (t | |
115 | (rfc822-bad-address "Rubbish in address")))) | |
116 | ||
117 | (defun rfc822-snarf-words () | |
118 | (rfc822-snarf-word) | |
119 | (while (rfc822-looking-at ?.) | |
120 | (rfc822-snarf-word))) | |
121 | ||
122 | (defun rfc822-snarf-subdomain () | |
123 | ;; sub-domain is domain-ref | domain-literal | |
124 | (cond ((= (following-char) ?\[) | |
125 | ;; domain-ref | |
126 | (or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]") | |
127 | (rfc822-bad-address "Unterminated domain literal [...]"))) | |
55872f3e | 128 | ((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+") |
cedaf3aa RS |
129 | ;; domain-literal = atom |
130 | ) | |
131 | (t | |
132 | (rfc822-bad-address "Rubbish in host/domain specification")))) | |
133 | ||
134 | (defun rfc822-snarf-domain () | |
135 | (rfc822-snarf-subdomain) | |
136 | (while (rfc822-looking-at ?.) | |
137 | (rfc822-snarf-subdomain))) | |
138 | ||
139 | (defun rfc822-snarf-frob-list (name separator terminator snarfer | |
140 | &optional return) | |
141 | (let ((first t) | |
142 | (list ()) | |
143 | tem) | |
144 | (while (cond ((eobp) | |
145 | (rfc822-bad-address | |
146 | (format "End of addresses in middle of %s" name))) | |
147 | ((rfc822-looking-at terminator) | |
148 | nil) | |
149 | ((rfc822-looking-at separator) | |
150 | ;; multiple separators are allowed and do nothing. | |
151 | (while (rfc822-looking-at separator)) | |
152 | t) | |
153 | (first | |
154 | t) | |
155 | (t | |
156 | (rfc822-bad-address | |
157 | (format "Gubbish in middle of %s" name)))) | |
158 | (setq tem (funcall snarfer) | |
159 | first nil) | |
160 | (and return tem | |
161 | (setq list (if (listp tem) | |
162 | (nconc (reverse tem) list) | |
163 | (cons tem list))))) | |
164 | (nreverse list))) | |
165 | ||
166 | ;; return either an address (a string) or a list of addresses | |
167 | (defun rfc822-addresses-1 (&optional allow-groups) | |
168 | ;; Looking for an rfc822 `address' | |
169 | ;; Either a group (1*word ":" [#mailbox] ";") | |
170 | ;; or a mailbox (addr-spec | 1*word route-addr) | |
171 | ;; addr-spec is (local-part "@" domain) | |
172 | ;; route-addr is ("<" [1#("@" domain) ":"] addr-spec ">") | |
173 | ;; local-part is (word *("." word)) | |
174 | ;; word is (atom | quoted-string) | |
175 | ;; quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)") | |
176 | ;; atom is [^\000-\037\177 ()<>@,;:\".[]]+ | |
177 | ;; domain is sub-domain *("." sub-domain) | |
178 | ;; sub-domain is domain-ref | domain-literal | |
179 | ;; domain-literal is "[" *(dtext | quoted-pair) "]" | |
180 | ;; dtext is "[^][\\n" | |
181 | ;; domain-ref is atom | |
182 | (let ((address-start (point)) | |
183 | (n 0)) | |
184 | (catch 'address | |
185 | ;; optimize common cases: | |
186 | ;; foo | |
187 | ;; foo.bar@bar.zap | |
188 | ;; followed by "\\'\\|,\\|([^()\\]*)\\'" | |
189 | ;; other common cases are: | |
190 | ;; foo bar <foo.bar@baz.zap> | |
191 | ;; "foo bar" <foo.bar@baz.zap> | |
192 | ;; those aren't hacked yet. | |
55872f3e | 193 | (if (and (rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037 ()<>@,;:\\\"]+\\)" t) |
cedaf3aa RS |
194 | (progn (or (eobp) |
195 | (rfc822-looking-at ?,)))) | |
196 | (progn | |
197 | ;; rfc822-looking-at may have inserted a space | |
198 | (or (bobp) (/= (preceding-char) ?\ ) (delete-char -1)) | |
199 | ;; relying on the fact that rfc822-looking-at <char> | |
200 | ;; doesn't mung match-data | |
201 | (throw 'address (buffer-substring address-start (match-end 0))))) | |
202 | (goto-char address-start) | |
203 | (while t | |
204 | (cond ((and (= n 1) (rfc822-looking-at ?@)) | |
205 | ;; local-part@domain | |
206 | (rfc822-snarf-domain) | |
207 | (throw 'address | |
208 | (buffer-substring address-start (point)))) | |
209 | ((rfc822-looking-at ?:) | |
210 | (cond ((not allow-groups) | |
211 | (rfc822-bad-address "A group name may not appear here")) | |
212 | ((= n 0) | |
213 | (rfc822-bad-address "No name for :...; group"))) | |
214 | ;; group | |
215 | (throw 'address | |
216 | ;; return a list of addresses | |
217 | (rfc822-snarf-frob-list ":...; group" ?\, ?\; | |
218 | 'rfc822-addresses-1 t))) | |
219 | ((rfc822-looking-at ?<) | |
220 | (let ((start (point)) | |
221 | (strip t)) | |
222 | (cond ((rfc822-looking-at ?>) | |
223 | ;; empty path | |
224 | ()) | |
225 | ((and (not (eobp)) (= (following-char) ?\@)) | |
226 | ;; <@foo.bar,@baz:quux@abcd.efg> | |
227 | (rfc822-snarf-frob-list "<...> address" ?\, ?\: | |
228 | (function (lambda () | |
229 | (if (rfc822-looking-at ?\@) | |
230 | (rfc822-snarf-domain) | |
231 | (rfc822-bad-address | |
232 | "Gubbish in route-addr"))))) | |
233 | (rfc822-snarf-words) | |
234 | (or (rfc822-looking-at ?@) | |
235 | (rfc822-bad-address "Malformed <..@..> address")) | |
236 | (rfc822-snarf-domain) | |
237 | (setq strip nil)) | |
238 | ((progn (rfc822-snarf-words) (rfc822-looking-at ?@)) | |
239 | ; allow <foo> (losing unix seems to do this) | |
240 | (rfc822-snarf-domain))) | |
241 | (let ((end (point))) | |
242 | (if (rfc822-looking-at ?\>) | |
243 | (throw 'address | |
244 | (buffer-substring (if strip start (1- start)) | |
245 | (if strip end (1+ end)))) | |
246 | (rfc822-bad-address "Unterminated <...> address"))))) | |
55872f3e | 247 | ((looking-at "[^][\000-\037 ()<>@,;:\\.]") |
cedaf3aa RS |
248 | ;; this allows "." to be part of the words preceding |
249 | ;; an addr-spec, since many broken mailers output | |
250 | ;; "Hern K. Herklemeyer III | |
251 | ;; <yank@megadeath.dod.gods-own-country>" | |
278fc732 | 252 | (let ((again t)) |
253 | (while again | |
254 | (or (= n 0) (bobp) (= (preceding-char) ?\ ) | |
255 | (insert ?\ )) | |
48aefb44 | 256 | (rfc822-snarf-words) |
278fc732 | 257 | (setq n (1+ n)) |
258 | (setq again (or (rfc822-looking-at ?.) | |
55872f3e | 259 | (looking-at "[^][\000-\037 ()<>@,;:\\.]")))))) |
cedaf3aa RS |
260 | ((= n 0) |
261 | (throw 'address nil)) | |
262 | ((= n 1) ; allow "foo" (losing unix seems to do this) | |
263 | (throw 'address | |
264 | (buffer-substring address-start (point)))) | |
278fc732 | 265 | ((> n 1) |
266 | (rfc822-bad-address "Missing comma between addresses or badly-formatted address")) | |
267 | ((or (eobp) (= (following-char) ?,)) | |
cedaf3aa RS |
268 | (rfc822-bad-address "Missing comma or route-spec")) |
269 | (t | |
270 | (rfc822-bad-address "Strange character or missing comma"))))))) | |
271 | ||
272 | ||
273 | (defun rfc822-addresses (header-text) | |
55872f3e | 274 | (if (string-match "\\`[ \t]*\\([^][\000-\037 ()<>@,;:\\\".]+\\)[ \t]*\\'" |
cedaf3aa RS |
275 | header-text) |
276 | ;; Make very simple case moderately fast. | |
277 | (list (substring header-text (match-beginning 1) (match-end 1))) | |
278 | (let ((buf (generate-new-buffer " rfc822"))) | |
279 | (unwind-protect | |
280 | (save-excursion | |
281 | (set-buffer buf) | |
282 | (make-local-variable 'case-fold-search) | |
283 | (setq case-fold-search nil) ;For speed(?) | |
284 | (insert header-text) | |
285 | ;; unfold continuation lines | |
286 | (goto-char (point-min)) | |
287 | ||
288 | (while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]" nil t) | |
289 | (replace-match "\\1 " t)) | |
290 | ||
291 | (goto-char (point-min)) | |
292 | (rfc822-nuke-whitespace) | |
293 | (let ((list ()) | |
294 | tem | |
295 | address-start); this is for rfc822-bad-address | |
296 | (while (not (eobp)) | |
297 | (setq address-start (point)) | |
298 | (setq tem | |
299 | (catch 'address ; this is for rfc822-bad-address | |
300 | (cond ((rfc822-looking-at ?\,) | |
301 | nil) | |
55872f3e | 302 | ((looking-at "[][\000-\037@;:\\.>)]") |
cedaf3aa RS |
303 | (forward-char) |
304 | (rfc822-bad-address | |
305 | (format "Strange character \\%c found" | |
306 | (preceding-char)))) | |
307 | (t | |
308 | (rfc822-addresses-1 t))))) | |
309 | (cond ((null tem)) | |
310 | ((stringp tem) | |
311 | (setq list (cons tem list))) | |
312 | (t | |
313 | (setq list (nconc (nreverse tem) list))))) | |
314 | (nreverse list))) | |
315 | (and buf (kill-buffer buf)))))) | |
316 | ||
49116ac0 JB |
317 | (provide 'rfc822) |
318 | ||
c88ab9ce | 319 | ;;; rfc822.el ends here |