1 ;;; ietf-drums.el --- Functions for parsing RFC822bis headers
2 ;; Copyright (C) 1998, 1999, 2000
3 ;; Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
25 ;; DRUMS is an IETF Working Group that works (or worked) on the
26 ;; successor to RFC822, "Standard For The Format Of Arpa Internet Text
27 ;; Messages". This library is based on
28 ;; draft-ietf-drums-msg-fmt-05.txt, released on 1998-08-05.
32 (eval-when-compile (require 'cl
))
36 (defvar ietf-drums-no-ws-ctl-token
"\001-\010\013\014\016-\037\177"
37 "US-ASCII control characters excluding CR, LF and white space.")
38 (defvar ietf-drums-text-token
"\001-\011\013\014\016-\177"
39 "US-ASCII characters exlcuding CR and LF.")
40 (defvar ietf-drums-specials-token
"()<>[]:;@\\,.\""
41 "Special characters.")
42 (defvar ietf-drums-quote-token
"\\"
44 (defvar ietf-drums-wsp-token
" \t"
46 (defvar ietf-drums-fws-regexp
47 (concat "[" ietf-drums-wsp-token
"]*\n[" ietf-drums-wsp-token
"]+")
48 "Folding white space.")
49 (defvar ietf-drums-atext-token
"-^a-zA-Z0-9!#$%&'*+/=?_`{|}~"
51 (defvar ietf-drums-dot-atext-token
"-^a-zA-Z0-9!#$%&'*+/=?_`{|}~."
52 "Textual token including full stop.")
53 (defvar ietf-drums-qtext-token
54 (concat ietf-drums-no-ws-ctl-token
"\041\043-\133\135-\177")
55 "Non-white-space control characaters, plus the rest of ASCII excluding backslash and doublequote.")
56 (defvar ietf-drums-tspecials
"][()<>@,;:\\\"/?="
59 (defvar ietf-drums-syntax-table
60 (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table
)))
61 (modify-syntax-entry ?
\\ "/" table
)
62 (modify-syntax-entry ?
< "(" table
)
63 (modify-syntax-entry ?
> ")" table
)
64 (modify-syntax-entry ?
@ "w" table
)
65 (modify-syntax-entry ?
/ "w" table
)
66 (modify-syntax-entry ?
= " " table
)
67 (modify-syntax-entry ?
* " " table
)
68 (modify-syntax-entry ?\
; " " table)
69 (modify-syntax-entry ?
\' " " table
)
72 (defun ietf-drums-token-to-list (token)
73 "Translate TOKEN into a list of characters."
76 (while (< i
(length token
))
77 (setq c
(mm-char-int (aref token i
)))
80 ((eq c
(mm-char-int ?-
))
86 (push (mm-make-char 'ascii b
) out
)
90 (push (mm-make-char 'ascii c
) out
))
93 (push (mm-make-char 'ascii b
) out
))
97 (defsubst ietf-drums-init
(string)
98 (set-syntax-table ietf-drums-syntax-table
)
100 (ietf-drums-unfold-fws)
101 (goto-char (point-min)))
103 (defun ietf-drums-remove-comments (string)
104 "Remove comments from STRING."
107 (ietf-drums-init string
)
109 (setq c
(char-after))
114 (delete-region (point) (progn (forward-sexp 1) (point))))
119 (defun ietf-drums-remove-whitespace (string)
120 "Remove whitespace from STRING."
122 (ietf-drums-init string
)
125 (setq c
(char-after))
131 ((memq c
'(? ?
\t ?
\n))
137 (defun ietf-drums-get-comment (string)
138 "Return the first comment in STRING."
140 (ietf-drums-init string
)
143 (setq c
(char-after))
151 (progn (forward-sexp 1) (1- (point))))))
156 (defun ietf-drums-strip (string)
157 "Remove comments and whitespace from STRING."
158 (ietf-drums-remove-whitespace (ietf-drums-remove-comments string
)))
160 (defun ietf-drums-parse-address (string)
161 "Parse STRING and return a MAILBOX / DISPLAY-NAME pair."
163 (let (display-name mailbox c display-string
)
164 (ietf-drums-init string
)
166 (setq c
(char-after))
174 (push (buffer-substring
175 (1+ (point)) (progn (forward-sexp 1) (1- (point))))
177 ((looking-at (concat "[" ietf-drums-atext-token
"@" "]"))
178 (push (buffer-substring (point) (progn (forward-sexp 1) (point)))
182 (ietf-drums-remove-whitespace
183 (ietf-drums-remove-comments
186 (progn (forward-sexp 1) (1- (point))))))))
187 (t (error "Unknown symbol: %c" c
))))
188 ;; If we found no display-name, then we look for comments.
191 (mapconcat 'identity
(reverse display-name
) " "))
192 (setq display-string
(ietf-drums-get-comment string
)))
194 (when (string-match "@" display-string
)
196 (mapconcat 'identity
(nreverse display-name
) "")
197 (ietf-drums-get-comment string
)))
198 (cons mailbox display-string
)))))
200 (defun ietf-drums-parse-addresses (string)
201 "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs."
203 (ietf-drums-init string
)
207 (setq c
(char-after))
209 ((memq c
'(?
\" ?
< ?\
())
212 (push (ietf-drums-parse-address (buffer-substring beg
(point)))
218 (push (ietf-drums-parse-address (buffer-substring beg
(point)))
222 (defun ietf-drums-unfold-fws ()
223 "Unfold folding white space in the current buffer."
224 (goto-char (point-min))
225 (while (re-search-forward ietf-drums-fws-regexp nil t
)
226 (replace-match " " t t
))
227 (goto-char (point-min)))
229 (defun ietf-drums-parse-date (string)
230 "Return an Emacs time spec from STRING."
231 (apply 'encode-time
(parse-time-string string
)))
233 (defun ietf-drums-narrow-to-header ()
234 "Narrow to the header section in the current buffer."
236 (goto-char (point-min))
237 (if (re-search-forward "^\r?$" nil
1)
240 (goto-char (point-min)))
242 (defun ietf-drums-quote-string (string)
243 "Quote string if it needs quoting to be displayed in a header."
244 (if (string-match (concat "[^" ietf-drums-atext-token
"]") string
)
245 (concat "\"" string
"\"")
248 (provide 'ietf-drums
)
250 ;;; ietf-drums.el ends here