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;;; rfc2368.el --- support for rfc2368 -*- lexical-binding:t -*-
;; Copyright (C) 1998, 2000-2021 Free Software Foundation, Inc.
;; Author: Sen Nagata <sen@eccosys.com>
;; Keywords: mail
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; 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
;;
;; acknowledgments:
;;
;; 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 `?'.")
(defun rfc2368-unhexify-string (string)
"Unhexify STRING -- e.g. `hello%20there' -> `hello there'."
(replace-regexp-in-string "%[[:xdigit:]]\\{2\\}"
(lambda (match)
(string (string-to-number (substring match 1)
16)))
string t t))
(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)
(setq mailto-url (replace-regexp-in-string "\n" " " mailto-url))
(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
(setq prequery (rfc2368-unhexify-string prequery))
(if (assoc "To" headers-alist)
(let* ((our-cons-cell
(assoc "To" headers-alist))
(our-cdr
(cdr our-cons-cell)))
(setcdr our-cons-cell (concat prequery ", " our-cdr)))
(setq headers-alist
(cons (cons "To" prequery) headers-alist)))))
headers-alist)
(error "Failed to match a mailto: url"))))
(provide 'rfc2368)
;;; rfc2368.el ends here
|
