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715a2ca2 | 1 | ;;; ietf-drums.el --- functions for parsing RFC822bis headers |
8f688cb0 | 2 | ;; Copyright (C) 1998, 1999, 2000, 2002 |
c113de23 GM |
3 | ;; Free Software Foundation, Inc. |
4 | ||
5 | ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org> | |
6 | ;; This file is part of GNU Emacs. | |
7 | ||
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) | |
11 | ;; any later version. | |
12 | ||
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. | |
17 | ||
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. | |
22 | ||
23 | ;;; Commentary: | |
24 | ||
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. | |
29 | ||
30 | ;;; Code: | |
31 | ||
3b9d5a55 | 32 | (eval-when-compile (require 'cl)) |
c113de23 GM |
33 | (require 'time-date) |
34 | (require 'mm-util) | |
35 | ||
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" | |
8f688cb0 | 39 | "US-ASCII characters excluding CR and LF.") |
c113de23 GM |
40 | (defvar ietf-drums-specials-token "()<>[]:;@\\,.\"" |
41 | "Special characters.") | |
42 | (defvar ietf-drums-quote-token "\\" | |
43 | "Quote character.") | |
44 | (defvar ietf-drums-wsp-token " \t" | |
45 | "White space.") | |
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!#$%&'*+/=?_`{|}~" | |
50 | "Textual token.") | |
51 | (defvar ietf-drums-dot-atext-token "-^a-zA-Z0-9!#$%&'*+/=?_`{|}~." | |
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") | |
a1506d29 | 55 | "Non-white-space control characters, plus the rest of ASCII excluding |
8f688cb0 | 56 | backslash and doublequote.") |
c113de23 GM |
57 | (defvar ietf-drums-tspecials "][()<>@,;:\\\"/?=" |
58 | "Tspecials.") | |
59 | ||
60 | (defvar ietf-drums-syntax-table | |
61 | (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table))) | |
62 | (modify-syntax-entry ?\\ "/" table) | |
63 | (modify-syntax-entry ?< "(" table) | |
64 | (modify-syntax-entry ?> ")" table) | |
65 | (modify-syntax-entry ?@ "w" table) | |
66 | (modify-syntax-entry ?/ "w" table) | |
67 | (modify-syntax-entry ?= " " table) | |
68 | (modify-syntax-entry ?* " " table) | |
69 | (modify-syntax-entry ?\; " " table) | |
70 | (modify-syntax-entry ?\' " " table) | |
71 | table)) | |
72 | ||
73 | (defun ietf-drums-token-to-list (token) | |
74 | "Translate TOKEN into a list of characters." | |
75 | (let ((i 0) | |
76 | b e c out range) | |
77 | (while (< i (length token)) | |
78 | (setq c (mm-char-int (aref token i))) | |
79 | (incf i) | |
80 | (cond | |
81 | ((eq c (mm-char-int ?-)) | |
82 | (if b | |
83 | (setq range t) | |
84 | (push c out))) | |
85 | (range | |
86 | (while (<= b c) | |
87 | (push (mm-make-char 'ascii b) out) | |
88 | (incf b)) | |
89 | (setq range nil)) | |
90 | ((= i (length token)) | |
91 | (push (mm-make-char 'ascii c) out)) | |
92 | (t | |
93 | (when b | |
94 | (push (mm-make-char 'ascii b) out)) | |
95 | (setq b c)))) | |
96 | (nreverse out))) | |
97 | ||
98 | (defsubst ietf-drums-init (string) | |
99 | (set-syntax-table ietf-drums-syntax-table) | |
100 | (insert string) | |
101 | (ietf-drums-unfold-fws) | |
102 | (goto-char (point-min))) | |
103 | ||
104 | (defun ietf-drums-remove-comments (string) | |
105 | "Remove comments from STRING." | |
106 | (with-temp-buffer | |
107 | (let (c) | |
108 | (ietf-drums-init string) | |
109 | (while (not (eobp)) | |
110 | (setq c (char-after)) | |
111 | (cond | |
112 | ((eq c ?\") | |
113 | (forward-sexp 1)) | |
114 | ((eq c ?\() | |
115 | (delete-region (point) (progn (forward-sexp 1) (point)))) | |
116 | (t | |
117 | (forward-char 1)))) | |
118 | (buffer-string)))) | |
119 | ||
120 | (defun ietf-drums-remove-whitespace (string) | |
121 | "Remove whitespace from STRING." | |
122 | (with-temp-buffer | |
123 | (ietf-drums-init string) | |
124 | (let (c) | |
125 | (while (not (eobp)) | |
126 | (setq c (char-after)) | |
127 | (cond | |
128 | ((eq c ?\") | |
129 | (forward-sexp 1)) | |
130 | ((eq c ?\() | |
131 | (forward-sexp 1)) | |
8afb8b29 | 132 | ((memq c '(?\ ?\t ?\n)) |
c113de23 GM |
133 | (delete-char 1)) |
134 | (t | |
135 | (forward-char 1)))) | |
136 | (buffer-string)))) | |
137 | ||
138 | (defun ietf-drums-get-comment (string) | |
139 | "Return the first comment in STRING." | |
140 | (with-temp-buffer | |
141 | (ietf-drums-init string) | |
142 | (let (result c) | |
143 | (while (not (eobp)) | |
144 | (setq c (char-after)) | |
145 | (cond | |
146 | ((eq c ?\") | |
147 | (forward-sexp 1)) | |
148 | ((eq c ?\() | |
149 | (setq result | |
150 | (buffer-substring | |
151 | (1+ (point)) | |
152 | (progn (forward-sexp 1) (1- (point)))))) | |
153 | (t | |
154 | (forward-char 1)))) | |
155 | result))) | |
156 | ||
157 | (defun ietf-drums-strip (string) | |
158 | "Remove comments and whitespace from STRING." | |
159 | (ietf-drums-remove-whitespace (ietf-drums-remove-comments string))) | |
160 | ||
161 | (defun ietf-drums-parse-address (string) | |
162 | "Parse STRING and return a MAILBOX / DISPLAY-NAME pair." | |
163 | (with-temp-buffer | |
164 | (let (display-name mailbox c display-string) | |
165 | (ietf-drums-init string) | |
166 | (while (not (eobp)) | |
167 | (setq c (char-after)) | |
168 | (cond | |
169 | ((or (eq c ? ) | |
170 | (eq c ?\t)) | |
171 | (forward-char 1)) | |
172 | ((eq c ?\() | |
173 | (forward-sexp 1)) | |
174 | ((eq c ?\") | |
175 | (push (buffer-substring | |
176 | (1+ (point)) (progn (forward-sexp 1) (1- (point)))) | |
177 | display-name)) | |
178 | ((looking-at (concat "[" ietf-drums-atext-token "@" "]")) | |
179 | (push (buffer-substring (point) (progn (forward-sexp 1) (point))) | |
180 | display-name)) | |
181 | ((eq c ?<) | |
182 | (setq mailbox | |
183 | (ietf-drums-remove-whitespace | |
184 | (ietf-drums-remove-comments | |
185 | (buffer-substring | |
186 | (1+ (point)) | |
187 | (progn (forward-sexp 1) (1- (point)))))))) | |
188 | (t (error "Unknown symbol: %c" c)))) | |
189 | ;; If we found no display-name, then we look for comments. | |
190 | (if display-name | |
191 | (setq display-string | |
192 | (mapconcat 'identity (reverse display-name) " ")) | |
193 | (setq display-string (ietf-drums-get-comment string))) | |
194 | (if (not mailbox) | |
195 | (when (string-match "@" display-string) | |
196 | (cons | |
197 | (mapconcat 'identity (nreverse display-name) "") | |
198 | (ietf-drums-get-comment string))) | |
199 | (cons mailbox display-string))))) | |
200 | ||
201 | (defun ietf-drums-parse-addresses (string) | |
202 | "Parse STRING and return a list of MAILBOX / DISPLAY-NAME pairs." | |
203 | (with-temp-buffer | |
204 | (ietf-drums-init string) | |
205 | (let ((beg (point)) | |
206 | pairs c) | |
207 | (while (not (eobp)) | |
208 | (setq c (char-after)) | |
209 | (cond | |
210 | ((memq c '(?\" ?< ?\()) | |
211 | (forward-sexp 1)) | |
212 | ((eq c ?,) | |
213 | (push (ietf-drums-parse-address (buffer-substring beg (point))) | |
214 | pairs) | |
215 | (forward-char 1) | |
216 | (setq beg (point))) | |
217 | (t | |
218 | (forward-char 1)))) | |
219 | (push (ietf-drums-parse-address (buffer-substring beg (point))) | |
220 | pairs) | |
221 | (nreverse pairs)))) | |
222 | ||
223 | (defun ietf-drums-unfold-fws () | |
224 | "Unfold folding white space in the current buffer." | |
225 | (goto-char (point-min)) | |
226 | (while (re-search-forward ietf-drums-fws-regexp nil t) | |
227 | (replace-match " " t t)) | |
228 | (goto-char (point-min))) | |
229 | ||
230 | (defun ietf-drums-parse-date (string) | |
231 | "Return an Emacs time spec from STRING." | |
232 | (apply 'encode-time (parse-time-string string))) | |
233 | ||
234 | (defun ietf-drums-narrow-to-header () | |
235 | "Narrow to the header section in the current buffer." | |
236 | (narrow-to-region | |
237 | (goto-char (point-min)) | |
238 | (if (re-search-forward "^\r?$" nil 1) | |
239 | (match-beginning 0) | |
240 | (point-max))) | |
241 | (goto-char (point-min))) | |
242 | ||
243 | (defun ietf-drums-quote-string (string) | |
244 | "Quote string if it needs quoting to be displayed in a header." | |
245 | (if (string-match (concat "[^" ietf-drums-atext-token "]") string) | |
246 | (concat "\"" string "\"") | |
247 | string)) | |
248 | ||
249 | (provide 'ietf-drums) | |
250 | ||
ab5796a9 | 251 | ;;; arch-tag: 379a0191-dbae-4ca6-a0f5-d4202c209ef9 |
c113de23 | 252 | ;;; ietf-drums.el ends here |