1 ;;; ietf-drums.el --- Functions for parsing RFC822bis headers
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software: you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation, either version 3 of the License, or
12 ;; (at your option) any later version.
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;; DRUMS is an IETF Working Group that works (or worked) on the
25 ;; successor to RFC822, "Standard For The Format Of Arpa Internet Text
26 ;; Messages". This library is based on
27 ;; draft-ietf-drums-msg-fmt-05.txt, released on 1998-08-05.
29 ;; Pending a real regression self test suite, Simon Josefsson added
30 ;; various self test expressions snipped from bug reports, and their
31 ;; expected value, below. I you believe it could be useful, please
32 ;; add your own test cases, or write a real self test suite, or just
35 ;; <m3oekvfd50.fsf@whitebox.m5r.de>
36 ;; (ietf-drums-parse-address "'foo' <foo@example.com>")
37 ;; => ("foo@example.com" . "'foo'")
41 (eval-when-compile (require 'cl))
45 (defvar ietf-drums-no-ws-ctl-token "\001-\010\013\014\016-\037\177"
46 "US-ASCII control characters excluding CR, LF and white space.")
47 (defvar ietf-drums-text-token "\001-\011\013\014\016-\177"
48 "US-ASCII characters excluding CR and LF.")
49 (defvar ietf-drums-specials-token "()<>[]:;@\\,.\""
50 "Special characters.")
51 (defvar ietf-drums-quote-token "\\"
53 (defvar ietf-drums-wsp-token " \t"
55 (defvar ietf-drums-fws-regexp
56 (concat "[" ietf-drums-wsp-token "]*\n[" ietf-drums-wsp-token "]+")
57 "Folding white space.")
58 (defvar ietf-drums-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~"
60 (defvar ietf-drums-dot-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~."
61 "Textual token including full stop.")
62 (defvar ietf-drums-qtext-token
63 (concat ietf-drums-no-ws-ctl-token "\041\043-\133\135-\177")
64 "Non-white-space control characters, plus the rest of ASCII excluding
65 backslash and doublequote.")
66 (defvar ietf-drums-tspecials "][()<>@,;:\\\"/?="
69 (defvar ietf-drums-syntax-table
70 (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
71 (modify-syntax-entry ?\\ "/" table)
72 (modify-syntax-entry ?< "(" table)
73 (modify-syntax-entry ?> ")" table)
74 (modify-syntax-entry ?@ "w" table)
75 (modify-syntax-entry ?/ "w" table)
76 (modify-syntax-entry ?* "_" table)
77 (modify-syntax-entry ?\; "_" table)
78 (modify-syntax-entry ?\' "_" table)
79 (if (featurep 'xemacs)
82 (modify-syntax-entry i "w" table)
86 (defun ietf-drums-token-to-list (token)
87 "Translate TOKEN into a list of characters."
90 (while (< i (length token))
91 (setq c (mm-char-int (aref token i)))
94 ((eq c (mm-char-int ?-))
100 (push (make-char 'ascii b) out)
103 ((= i (length token))
104 (push (make-char 'ascii c) out))
107 (push (make-char 'ascii b) out))
111 (defsubst ietf-drums-init (string)
112 (set-syntax-table ietf-drums-syntax-table)
114 (ietf-drums-unfold-fws)
115 (goto-char (point-min)))
117 (defun ietf-drums-remove-comments (string)
118 "Remove comments from STRING."
121 (ietf-drums-init string)
123 (setq c (char-after))
128 (error (goto-char (point-max)))))
133 (with-syntax-table (copy-syntax-table ietf-drums-syntax-table)
134 (modify-syntax-entry ?\" "w")
137 (error (point-max)))))
142 (defun ietf-drums-remove-whitespace (string)
143 "Remove whitespace from STRING."
145 (ietf-drums-init string)
148 (setq c (char-after))
154 ((memq c '(?\ ?\t ?\n))
160 (defun ietf-drums-get-comment (string)
161 "Return the first comment in STRING."
163 (ietf-drums-init string)
166 (setq c (char-after))
174 (progn (forward-sexp 1) (1- (point))))))
179 (defun ietf-drums-strip (string)
180 "Remove comments and whitespace from STRING."
181 (ietf-drums-remove-whitespace (ietf-drums-remove-comments string)))
183 (defun ietf-drums-parse-address (string)
184 "Parse STRING and return a MAILBOX / DISPLAY-NAME pair."
186 (let (display-name mailbox c display-string)
187 (ietf-drums-init string)
189 (setq c (char-after))
197 (push (buffer-substring
198 (1+ (point)) (progn (forward-sexp 1) (1- (point))))
200 ((looking-at (concat "[" ietf-drums-atext-token "@" "]"))
201 (push (buffer-substring (point) (progn (forward-sexp 1) (point)))
205 (ietf-drums-remove-whitespace
206 (ietf-drums-remove-comments
209 (progn (forward-sexp 1) (1- (point))))))))
211 (message "Unknown symbol: %c" c)
213 ;; If we found no display-name, then we look for comments.
216 (mapconcat 'identity (reverse display-name) " "))
217 (setq display-string (ietf-drums-get-comment string)))
219 (when (string-match "@" display-string)
221 (mapconcat 'identity (nreverse display-name) "")
222 (ietf-drums-get-comment string)))
223 (cons mailbox display-string)))))
225 (defun ietf-drums-parse-addresses (string &optional rawp)
226 "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs.
227 If RAWP, don't actually parse the addresses, but instead return
228 a list of address strings."
232 (ietf-drums-init string)
236 (setq c (char-after))
238 ((memq c '(?\" ?< ?\())
242 (skip-chars-forward "^,"))))
246 (buffer-substring beg (point))
248 (ietf-drums-parse-address
249 (buffer-substring beg (point)))
251 (if address (push address pairs))
258 (buffer-substring beg (point))
260 (ietf-drums-parse-address
261 (buffer-substring beg (point)))
263 (if address (push address pairs))
266 (defun ietf-drums-unfold-fws ()
267 "Unfold folding white space in the current buffer."
268 (goto-char (point-min))
269 (while (re-search-forward ietf-drums-fws-regexp nil t)
270 (replace-match " " t t))
271 (goto-char (point-min)))
273 (defun ietf-drums-parse-date (string)
274 "Return an Emacs time spec from STRING."
275 (apply 'encode-time (parse-time-string string)))
277 (defun ietf-drums-narrow-to-header ()
278 "Narrow to the header section in the current buffer."
280 (goto-char (point-min))
281 (if (re-search-forward "^\r?$" nil 1)
284 (goto-char (point-min)))
286 (defun ietf-drums-quote-string (string)
287 "Quote string if it needs quoting to be displayed in a header."
288 (if (string-match (concat "[^" ietf-drums-atext-token "]") string)
289 (concat "\"" string "\"")
292 (defun ietf-drums-make-address (name address)
294 (concat (ietf-drums-quote-string name) " <" address ">")
297 (provide 'ietf-drums)
299 ;; arch-tag: 379a0191-dbae-4ca6-a0f5-d4202c209ef9
300 ;;; ietf-drums.el ends here