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136 lines
4.3 KiB
EmacsLisp
136 lines
4.3 KiB
EmacsLisp
;;; rfc2368.el --- support for rfc2368
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;; Copyright (C) 1998, 2000-2017 Free Software Foundation, Inc.
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;; Author: Sen Nagata <sen@eccosys.com>
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;; Keywords: mail
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;; notes:
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;;
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;; -repeat after me: "the colon is not part of the header name..."
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;; -if w3 becomes part of emacs, then it may make sense to have this
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;; file depend on w3 -- the maintainer of w3 says merging w/ Emacs
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;; is planned!
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;;
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;; historical note:
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;;
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;; this is intended as a replacement for mailto.el
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;;
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;; acknowledgments:
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;;
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;; the functions that deal w/ unhexifying in this file were basically
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;; taken from w3 -- i hope to replace them w/ something else soon OR
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;; perhaps if w3 becomes a part of emacs soon, use the functions from w3.
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;;; History:
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;;
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;; 0.3:
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;;
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;; added the constant rfc2368-version
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;; implemented first potential fix for a bug in rfc2368-mailto-regexp
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;; implemented first potential fix for a bug in rfc2368-parse-mailto
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;; (both bugs reported by Kenichi OKADA)
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;;
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;; 0.2:
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;;
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;; started to use checkdoc
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;;
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;; 0.1:
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;;
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;; initial implementation
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;;; Code:
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;; only an approximation?
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;; see rfc 1738
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(defconst rfc2368-mailto-regexp
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"^\\(mailto:\\)\\([^?]+\\)*\\(\\?\\(.*\\)\\)*"
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"Regular expression to match and aid in parsing a mailto url.")
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;; describes 'mailto:'
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(defconst rfc2368-mailto-scheme-index 1
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"Describes the `mailto:' portion of the url.")
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;; i'm going to call this part the 'prequery'
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(defconst rfc2368-mailto-prequery-index 2
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"Describes the portion of the url between `mailto:' and `?'.")
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;; i'm going to call this part the 'query'
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(defconst rfc2368-mailto-query-index 4
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"Describes the portion of the url after `?'.")
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(defun rfc2368-unhexify-string (string)
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"Unhexify STRING -- e.g. `hello%20there' -> `hello there'."
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(replace-regexp-in-string "%[[:xdigit:]]\\{2\\}"
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(lambda (match)
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(string (string-to-number (substring match 1)
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16)))
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string t t))
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(defun rfc2368-parse-mailto-url (mailto-url)
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"Parse MAILTO-URL, and return an alist of header-name, header-value pairs.
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MAILTO-URL should be a RFC 2368 (mailto) compliant url. A cons cell w/ a
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key of `Body' is a special case and is considered a header for this purpose.
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The returned alist is intended for use w/ the `compose-mail' interface.
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Note: make sure MAILTO-URL has been \"unhtmlized\" (e.g., & -> &), before
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calling this function."
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(let ((case-fold-search t)
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prequery query headers-alist)
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(setq mailto-url (replace-regexp-in-string "\n" " " mailto-url))
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(if (string-match rfc2368-mailto-regexp mailto-url)
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(progn
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(setq prequery
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(match-string rfc2368-mailto-prequery-index mailto-url))
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(setq query
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(match-string rfc2368-mailto-query-index mailto-url))
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;; build alist of header name-value pairs
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(if (not (null query))
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(setq headers-alist
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(mapcar
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(lambda (x)
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(let* ((temp-list (split-string x "="))
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(header-name (car temp-list))
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(header-value (cadr temp-list)))
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;; return ("Header-Name" . "header-value")
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(cons
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(capitalize (rfc2368-unhexify-string header-name))
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(rfc2368-unhexify-string header-value))))
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(split-string query "&"))))
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;; deal w/ multiple 'To' recipients
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(if prequery
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(progn
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(setq prequery (rfc2368-unhexify-string prequery))
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(if (assoc "To" headers-alist)
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(let* ((our-cons-cell
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(assoc "To" headers-alist))
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(our-cdr
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(cdr our-cons-cell)))
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(setcdr our-cons-cell (concat prequery ", " our-cdr)))
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(setq headers-alist
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(cons (cons "To" prequery) headers-alist)))))
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headers-alist)
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(error "Failed to match a mailto: url"))))
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(provide 'rfc2368)
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;;; rfc2368.el ends here
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