1;;; rfc822.el --- hairy rfc822 parser for mail and news and suchlike 2 3;; Copyright (C) 1986, 1987, 1990, 2001, 2002, 2003, 2004, 4;; 2005, 2006, 2007 Free Software Foundation, Inc. 5 6;; Author: Richard Mlynarik <mly@eddie.mit.edu> 7;; Maintainer: FSF 8;; Keywords: mail 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 14;; the Free Software Foundation; either version 2, or (at your option) 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 the 24;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 25;; Boston, MA 02110-1301, USA. 26 27;;; Commentary: 28 29;; Support functions for parsing RFC-822 headers, used by mail and news 30;; modes. 31 32;;; Code: 33 34(defvar rfc822-address-start) 35 36;; uses rfc822-address-start free, throws to address 37(defun rfc822-bad-address (reason) 38 (save-restriction 39 (insert "_^_") 40 (narrow-to-region rfc822-address-start 41 (if (re-search-forward "[,;]" nil t) 42 (max (point-min) (1- (point))) 43 (point-max))) 44 ;; make the error string be suitable for inclusion in (...) 45 (let ((losers '("\\" "(" ")" "\n"))) 46 (while losers 47 (goto-char (point-min)) 48 (while (search-forward (car losers) nil t) 49 (backward-char 1) 50 (insert ?\\) 51 (forward-char 1)) 52 (setq losers (cdr losers)))) 53 (goto-char (point-min)) (insert "(Unparsable address -- " 54 reason 55 ": \"") 56 (goto-char (point-max)) (insert "\")")) 57 (rfc822-nuke-whitespace) 58 (throw 'address (buffer-substring rfc822-address-start (point)))) 59 60(defun rfc822-nuke-whitespace (&optional leave-space) 61 (let (ch) 62 (while (cond ((eobp) 63 nil) 64 ((= (setq ch (following-char)) ?\() 65 (forward-char 1) 66 (while (if (eobp) 67 (rfc822-bad-address "Unbalanced comment (...)") 68 (/= (setq ch (following-char)) ?\))) 69 (cond ((looking-at "[^()\\]+") 70 (replace-match "")) 71 ((= ch ?\() 72 (rfc822-nuke-whitespace)) 73 ((< (point) (1- (point-max))) 74 (delete-char 2)) 75 (t 76 (rfc822-bad-address "orphaned backslash")))) 77 ;; delete remaining "()" 78 (forward-char -1) 79 (delete-char 2) 80 t) 81 ((memq ch '(?\ ?\t ?\n)) 82 (delete-region (point) 83 (progn (skip-chars-forward " \t\n") (point))) 84 t) 85 (t 86 nil))) 87 (or (not leave-space) 88 (eobp) 89 (bobp) 90 (= (preceding-char) ?\ ) 91 (insert ?\ )))) 92 93(defun rfc822-looking-at (regex &optional leave-space) 94 (if (cond ((stringp regex) 95 (if (looking-at regex) 96 (progn (goto-char (match-end 0)) 97 t))) 98 (t 99 (if (and (not (eobp)) 100 (= (following-char) regex)) 101 (progn (forward-char 1) 102 t)))) 103 (let ((tem (match-data))) 104 (rfc822-nuke-whitespace leave-space) 105 (set-match-data tem) 106 t))) 107 108(defun rfc822-snarf-word () 109 ;; word is atom | quoted-string 110 (cond ((= (following-char) ?\") 111 ;; quoted-string 112 (or (rfc822-looking-at "\"\\([^\"\\\n]\\|\\\\.\\|\\\\\n\\)*\"") 113 (rfc822-bad-address "Unterminated quoted string"))) 114 ((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+") 115 ;; atom 116 ) 117 (t 118 (rfc822-bad-address "Rubbish in address")))) 119 120(defun rfc822-snarf-words () 121 (rfc822-snarf-word) 122 (while (rfc822-looking-at ?.) 123 (rfc822-snarf-word))) 124 125(defun rfc822-snarf-subdomain () 126 ;; sub-domain is domain-ref | domain-literal 127 (cond ((= (following-char) ?\[) 128 ;; domain-ref 129 (or (rfc822-looking-at "\\[\\([^][\\\n]\\|\\\\.\\|\\\\\n\\)*\\]") 130 (rfc822-bad-address "Unterminated domain literal [...]"))) 131 ((rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\".]+") 132 ;; domain-literal = atom 133 ) 134 (t 135 (rfc822-bad-address "Rubbish in host/domain specification")))) 136 137(defun rfc822-snarf-domain () 138 (rfc822-snarf-subdomain) 139 (while (rfc822-looking-at ?.) 140 (rfc822-snarf-subdomain))) 141 142(defun rfc822-snarf-frob-list (name separator terminator snarfer 143 &optional return) 144 (let ((first t) 145 (list ()) 146 tem) 147 (while (cond ((eobp) 148 (rfc822-bad-address 149 (format "End of addresses in middle of %s" name))) 150 ((rfc822-looking-at terminator) 151 nil) 152 ((rfc822-looking-at separator) 153 ;; multiple separators are allowed and do nothing. 154 (while (rfc822-looking-at separator)) 155 t) 156 (first 157 t) 158 (t 159 (rfc822-bad-address 160 (format "Gubbish in middle of %s" name)))) 161 (setq tem (funcall snarfer) 162 first nil) 163 (and return tem 164 (setq list (if (listp tem) 165 (nconc (reverse tem) list) 166 (cons tem list))))) 167 (nreverse list))) 168 169;; return either an address (a string) or a list of addresses 170(defun rfc822-addresses-1 (&optional allow-groups) 171 ;; Looking for an rfc822 `address' 172 ;; Either a group (1*word ":" [#mailbox] ";") 173 ;; or a mailbox (addr-spec | 1*word route-addr) 174 ;; addr-spec is (local-part "@" domain) 175 ;; route-addr is ("<" [1#("@" domain) ":"] addr-spec ">") 176 ;; local-part is (word *("." word)) 177 ;; word is (atom | quoted-string) 178 ;; quoted-string is ("\([^\"\\n]\|\\.\|\\\n\)") 179 ;; atom is [^\000-\037\177 ()<>@,;:\".[]]+ 180 ;; domain is sub-domain *("." sub-domain) 181 ;; sub-domain is domain-ref | domain-literal 182 ;; domain-literal is "[" *(dtext | quoted-pair) "]" 183 ;; dtext is "[^][\\n" 184 ;; domain-ref is atom 185 (let ((rfc822-address-start (point)) 186 (n 0)) 187 (catch 'address 188 ;; optimize common cases: 189 ;; foo 190 ;; foo.bar@bar.zap 191 ;; followed by "\\'\\|,\\|([^()\\]*)\\'" 192 ;; other common cases are: 193 ;; foo bar <foo.bar@baz.zap> 194 ;; "foo bar" <foo.bar@baz.zap> 195 ;; those aren't hacked yet. 196 (if (and (rfc822-looking-at "[^][\000-\037 ()<>@,;:\\\"]+\\(\\|@[^][\000-\037 ()<>@,;:\\\"]+\\)" t) 197 (progn (or (eobp) 198 (rfc822-looking-at ?,)))) 199 (progn 200 ;; rfc822-looking-at may have inserted a space 201 (or (bobp) (/= (preceding-char) ?\ ) (delete-char -1)) 202 ;; relying on the fact that rfc822-looking-at <char> 203 ;; doesn't mung match-data 204 (throw 'address (buffer-substring rfc822-address-start (match-end 0))))) 205 (goto-char rfc822-address-start) 206 (while t 207 (cond ((and (= n 1) (rfc822-looking-at ?@)) 208 ;; local-part@domain 209 (rfc822-snarf-domain) 210 (throw 'address 211 (buffer-substring rfc822-address-start (point)))) 212 ((rfc822-looking-at ?:) 213 (cond ((not allow-groups) 214 (rfc822-bad-address "A group name may not appear here")) 215 ((= n 0) 216 (rfc822-bad-address "No name for :...; group"))) 217 ;; group 218 (throw 'address 219 ;; return a list of addresses 220 (rfc822-snarf-frob-list ":...; group" ?\, ?\; 221 'rfc822-addresses-1 t))) 222 ((rfc822-looking-at ?<) 223 (let ((start (point)) 224 (strip t)) 225 (cond ((rfc822-looking-at ?>) 226 ;; empty path 227 ()) 228 ((and (not (eobp)) (= (following-char) ?\@)) 229 ;; <@foo.bar,@baz:quux@abcd.efg> 230 (rfc822-snarf-frob-list "<...> address" ?\, ?\: 231 (function (lambda () 232 (if (rfc822-looking-at ?\@) 233 (rfc822-snarf-domain) 234 (rfc822-bad-address 235 "Gubbish in route-addr"))))) 236 (rfc822-snarf-words) 237 (or (rfc822-looking-at ?@) 238 (rfc822-bad-address "Malformed <..@..> address")) 239 (rfc822-snarf-domain) 240 (setq strip nil)) 241 ((progn (rfc822-snarf-words) (rfc822-looking-at ?@)) 242 ; allow <foo> (losing unix seems to do this) 243 (rfc822-snarf-domain))) 244 (let ((end (point))) 245 (if (rfc822-looking-at ?\>) 246 (throw 'address 247 (buffer-substring (if strip start (1- start)) 248 (if strip end (1+ end)))) 249 (rfc822-bad-address "Unterminated <...> address"))))) 250 ((looking-at "[^][\000-\037 ()<>@,;:\\.]") 251 ;; this allows "." to be part of the words preceding 252 ;; an addr-spec, since many broken mailers output 253 ;; "Hern K. Herklemeyer III 254 ;; <yank@megadeath.dod.gods-own-country>" 255 (let ((again t)) 256 (while again 257 (or (= n 0) (bobp) (= (preceding-char) ?\ ) 258 (insert ?\ )) 259 (rfc822-snarf-words) 260 (setq n (1+ n)) 261 (setq again (or (rfc822-looking-at ?.) 262 (looking-at "[^][\000-\037 ()<>@,;:\\.]")))))) 263 ((= n 0) 264 (throw 'address nil)) 265 ((= n 1) ; allow "foo" (losing unix seems to do this) 266 (throw 'address 267 (buffer-substring rfc822-address-start (point)))) 268 ((> n 1) 269 (rfc822-bad-address "Missing comma between addresses or badly-formatted address")) 270 ((or (eobp) (= (following-char) ?,)) 271 (rfc822-bad-address "Missing comma or route-spec")) 272 (t 273 (rfc822-bad-address "Strange character or missing comma"))))))) 274 275 276(defun rfc822-addresses (header-text) 277 (if (string-match "\\`[ \t]*\\([^][\000-\037 ()<>@,;:\\\".]+\\)[ \t]*\\'" 278 header-text) 279 ;; Make very simple case moderately fast. 280 (list (substring header-text (match-beginning 1) (match-end 1))) 281 (let ((buf (generate-new-buffer " rfc822"))) 282 (unwind-protect 283 (save-excursion 284 (set-buffer buf) 285 (make-local-variable 'case-fold-search) 286 (setq case-fold-search nil) ;For speed(?) 287 (insert header-text) 288 ;; unfold continuation lines 289 (goto-char (point-min)) 290 291 (while (re-search-forward "\\([^\\]\\(\\\\\\\\\\)*\\)\n[ \t]" nil t) 292 (replace-match "\\1 " t)) 293 294 (goto-char (point-min)) 295 (let ((list ()) 296 tem 297 rfc822-address-start); this is for rfc822-bad-address 298 (rfc822-nuke-whitespace) 299 (while (not (eobp)) 300 (setq rfc822-address-start (point)) 301 (setq tem 302 (catch 'address ; this is for rfc822-bad-address 303 (cond ((rfc822-looking-at ?\,) 304 nil) 305 ((looking-at "[][\000-\037@;:\\.>)]") 306 (forward-char) 307 (rfc822-bad-address 308 (format "Strange character \\%c found" 309 (preceding-char)))) 310 (t 311 (rfc822-addresses-1 t))))) 312 (cond ((null tem)) 313 ((stringp tem) 314 (setq list (cons tem list))) 315 (t 316 (setq list (nconc (nreverse tem) list))))) 317 (nreverse list))) 318 (and buf (kill-buffer buf)))))) 319 320(provide 'rfc822) 321 322;;; arch-tag: 5d388a24-e173-40fb-9b8e-85269de44b37 323;;; rfc822.el ends here 324