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;;; rfc2368.el --- support for rfc2368
;; Author: Sen Nagata <[email protected]>
;; Keywords: mail
;; Copyright (C) 1998, 2000 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;; notes:
;;
;; -repeat after me: "the colon is not part of the header name..."
;; -if w3 becomes part of emacs, then it may make sense to have this
;; file depend on w3 -- the maintainer of w3 says merging w/ Emacs
;; is planned!
;;
;; historical note:
;;
;; this is intended as a replacement for mailto.el
;;
;; acknowledgements:
;;
;; the functions that deal w/ unhexifying in this file were basically
;; taken from w3 -- i hope to replace them w/ something else soon OR
;; perhaps if w3 becomes a part of emacs soon, use the functions from w3.
;;; History:
;;
;; 0.3:
;;
;; added the constant rfc2368-version
;; implemented first potential fix for a bug in rfc2368-mailto-regexp
;; implemented first potential fix for a bug in rfc2368-parse-mailto
;; (both bugs reported by Kenichi OKADA)
;;
;; 0.2:
;;
;; started to use checkdoc
;;
;; 0.1:
;;
;; initial implementation
;;; Code:
;; only an approximation?
;; see rfc 1738
(defconst rfc2368-mailto-regexp
"^\\(mailto:\\)\\([^?]+\\)*\\(\\?\\(.*\\)\\)*"
"Regular expression to match and aid in parsing a mailto url.")
;; describes 'mailto:'
(defconst rfc2368-mailto-scheme-index 1
"Describes the 'mailto:' portion of the url.")
;; i'm going to call this part the 'prequery'
(defconst rfc2368-mailto-prequery-index 2
"Describes the portion of the url between 'mailto:' and '?'.")
;; i'm going to call this part the 'query'
(defconst rfc2368-mailto-query-index 4
"Describes the portion of the url after '?'.")
;; for dealing w/ unhexifying strings, my preferred approach is to use
;; a 'string-replace-match-using-function' which can perform a
;; string-replace-match and compute the replacement text based on a
;; passed function -- however, emacs doesn't seem to have such a
;; function yet :-(
;; for the moment a rip-off of url-unhex (w3/url.el)
(defun rfc2368-unhexify-char (char)
"Unhexify CHAR -- e.g. %20 -> <SPC>."
(if (> char ?9)
(if (>= char ?a)
(+ 10 (- char ?a))
(+ 10 (- char ?A)))
(- char ?0)))
;; for the moment a rip-off of url-unhex-string (w3/url.el) (slightly modified)
(defun rfc2368-unhexify-string (string)
"Unhexify STRING -- e.g. 'hello%20there' -> 'hello there'."
(let ((case-fold-search t)
(result ""))
(while (string-match "%[0-9a-f][0-9a-f]" string)
(let* ((start (match-beginning 0))
(hex-code (+ (* 16
(rfc2368-unhexify-char (elt string (+ start 1))))
(rfc2368-unhexify-char (elt string (+ start 2))))))
(setq result (concat
result (substring string 0 start)
(char-to-string hex-code))
string (substring string (match-end 0)))))
;; it seems clearer to do things this way than to just return:
;; (concat result string)
(setq result (concat result string))
result))
(defun rfc2368-parse-mailto-url (mailto-url)
"Parse MAILTO-URL, and return an alist of header-name, header-value pairs.
MAILTO-URL should be a RFC 2368 (mailto) compliant url. A cons cell w/ a
key of 'Body' is a special case and is considered a header for this purpose.
The returned alist is intended for use w/ the `compose-mail' interface.
Note: make sure MAILTO-URL has been 'unhtmlized' (e.g. & -> &), before
calling this function."
(let ((case-fold-search t)
prequery query headers-alist)
(if (string-match rfc2368-mailto-regexp mailto-url)
(progn
(setq prequery
(match-string rfc2368-mailto-prequery-index mailto-url))
(setq query
(match-string rfc2368-mailto-query-index mailto-url))
;; build alist of header name-value pairs
(if (not (null query))
(setq headers-alist
(mapcar
(lambda (x)
(let* ((temp-list (split-string x "="))
(header-name (car temp-list))
(header-value (cadr temp-list)))
;; return ("Header-Name" . "header-value")
(cons
(capitalize (rfc2368-unhexify-string header-name))
(rfc2368-unhexify-string header-value))))
(split-string query "&"))))
;; deal w/ multiple 'To' recipients
(if prequery
(progn
(if (assoc "To" headers-alist)
(let* ((our-cons-cell
(assoc "To" headers-alist))
(our-cdr
(cdr our-cons-cell)))
(setcdr our-cons-cell (concat our-cdr ", " prequery)))
(setq headers-alist
(cons (cons "To" prequery) headers-alist)))))
headers-alist)
(error "Failed to match a mailto: url"))
))
(provide 'rfc2368)
;;; rfc2368.el ends here
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