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1 | ;;; rfc2368.el --- support for rfc2368 |
2 | ||
4bcb5a9e | 3 | ;; Author: Sen Nagata <sen@eccosys.com> |
62f20204 GM |
4 | ;; Keywords: mail |
5 | ||
6 | ;; Copyright (C) 1998, 2000 Free Software Foundation, Inc. | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ;; | |
27 | ;; notes: | |
28 | ;; | |
29 | ;; -repeat after me: "the colon is not part of the header name..." | |
30 | ;; -if w3 becomes part of emacs, then it may make sense to have this | |
31 | ;; file depend on w3 -- the maintainer of w3 says merging w/ Emacs | |
32 | ;; is planned! | |
33 | ;; | |
34 | ;; historical note: | |
35 | ;; | |
36 | ;; this is intended as a replacement for mailto.el | |
37 | ;; | |
38 | ;; acknowledgements: | |
39 | ;; | |
40 | ;; the functions that deal w/ unhexifying in this file were basically | |
41 | ;; taken from w3 -- i hope to replace them w/ something else soon OR | |
42 | ;; perhaps if w3 becomes a part of emacs soon, use the functions from w3. | |
43 | ||
44 | ;;; History: | |
45 | ;; | |
46 | ;; 0.3: | |
47 | ;; | |
48 | ;; added the constant rfc2368-version | |
49 | ;; implemented first potential fix for a bug in rfc2368-mailto-regexp | |
50 | ;; implemented first potential fix for a bug in rfc2368-parse-mailto | |
51 | ;; (both bugs reported by Kenichi OKADA) | |
52 | ;; | |
53 | ;; 0.2: | |
54 | ;; | |
55 | ;; started to use checkdoc | |
56 | ;; | |
57 | ;; 0.1: | |
58 | ;; | |
59 | ;; initial implementation | |
60 | ||
61 | ;;; Code: | |
62 | ||
63 | ;; only an approximation? | |
64 | ;; see rfc 1738 | |
65 | (defconst rfc2368-mailto-regexp | |
66 | "^\\(mailto:\\)\\([^?]+\\)*\\(\\?\\(.*\\)\\)*" | |
67 | "Regular expression to match and aid in parsing a mailto url.") | |
68 | ||
69 | ;; describes 'mailto:' | |
70 | (defconst rfc2368-mailto-scheme-index 1 | |
71 | "Describes the 'mailto:' portion of the url.") | |
72 | ;; i'm going to call this part the 'prequery' | |
73 | (defconst rfc2368-mailto-prequery-index 2 | |
74 | "Describes the portion of the url between 'mailto:' and '?'.") | |
75 | ;; i'm going to call this part the 'query' | |
76 | (defconst rfc2368-mailto-query-index 4 | |
77 | "Describes the portion of the url after '?'.") | |
78 | ||
79 | ;; for dealing w/ unhexifying strings, my preferred approach is to use | |
80 | ;; a 'string-replace-match-using-function' which can perform a | |
81 | ;; string-replace-match and compute the replacement text based on a | |
82 | ;; passed function -- however, emacs doesn't seem to have such a | |
83 | ;; function yet :-( | |
84 | ||
85 | ;; for the moment a rip-off of url-unhex (w3/url.el) | |
86 | (defun rfc2368-unhexify-char (char) | |
87 | "Unhexify CHAR -- e.g. %20 -> <SPC>." | |
88 | (if (> char ?9) | |
89 | (if (>= char ?a) | |
90 | (+ 10 (- char ?a)) | |
91 | (+ 10 (- char ?A))) | |
92 | (- char ?0))) | |
93 | ||
94 | ;; for the moment a rip-off of url-unhex-string (w3/url.el) (slightly modified) | |
95 | (defun rfc2368-unhexify-string (string) | |
96 | "Unhexify STRING -- e.g. 'hello%20there' -> 'hello there'." | |
97 | (let ((case-fold-search t) | |
98 | (result "")) | |
99 | (while (string-match "%[0-9a-f][0-9a-f]" string) | |
100 | (let* ((start (match-beginning 0)) | |
101 | (hex-code (+ (* 16 | |
102 | (rfc2368-unhexify-char (elt string (+ start 1)))) | |
103 | (rfc2368-unhexify-char (elt string (+ start 2)))))) | |
104 | (setq result (concat | |
105 | result (substring string 0 start) | |
106 | (char-to-string hex-code)) | |
107 | string (substring string (match-end 0))))) | |
108 | ;; it seems clearer to do things this way than to just return: | |
109 | ;; (concat result string) | |
110 | (setq result (concat result string)) | |
111 | result)) | |
112 | ||
113 | (defun rfc2368-parse-mailto-url (mailto-url) | |
114 | "Parse MAILTO-URL, and return an alist of header-name, header-value pairs. | |
115 | MAILTO-URL should be a RFC 2368 (mailto) compliant url. A cons cell w/ a | |
116 | key of 'Body' is a special case and is considered a header for this purpose. | |
117 | The returned alist is intended for use w/ the `compose-mail' interface. | |
118 | Note: make sure MAILTO-URL has been 'unhtmlized' (e.g. & -> &), before | |
119 | calling this function." | |
120 | (let ((case-fold-search t) | |
121 | prequery query headers-alist) | |
122 | ||
123 | (if (string-match rfc2368-mailto-regexp mailto-url) | |
124 | (progn | |
125 | ||
126 | (setq prequery | |
127 | (match-string rfc2368-mailto-prequery-index mailto-url)) | |
a1506d29 | 128 | |
62f20204 GM |
129 | (setq query |
130 | (match-string rfc2368-mailto-query-index mailto-url)) | |
131 | ||
132 | ;; build alist of header name-value pairs | |
133 | (if (not (null query)) | |
134 | (setq headers-alist | |
135 | (mapcar | |
136 | (lambda (x) | |
137 | (let* ((temp-list (split-string x "=")) | |
138 | (header-name (car temp-list)) | |
139 | (header-value (cadr temp-list))) | |
140 | ;; return ("Header-Name" . "header-value") | |
141 | (cons | |
142 | (capitalize (rfc2368-unhexify-string header-name)) | |
143 | (rfc2368-unhexify-string header-value)))) | |
144 | (split-string query "&")))) | |
145 | ||
146 | ;; deal w/ multiple 'To' recipients | |
147 | (if prequery | |
148 | (progn | |
149 | (if (assoc "To" headers-alist) | |
150 | (let* ((our-cons-cell | |
151 | (assoc "To" headers-alist)) | |
152 | (our-cdr | |
153 | (cdr our-cons-cell))) | |
154 | (setcdr our-cons-cell (concat our-cdr ", " prequery))) | |
155 | (setq headers-alist | |
156 | (cons (cons "To" prequery) headers-alist))))) | |
a1506d29 | 157 | |
62f20204 | 158 | headers-alist) |
a1506d29 | 159 | |
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160 | (error "Failed to match a mailto: url")) |
161 | )) | |
162 | ||
163 | (provide 'rfc2368) | |
164 | ||
165 | ;;; rfc2368.el ends here |