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;;; idna.el --- Internationalizing Domain Names in Applications.
;; Copyright (C) 2003-2016 Simon Josefsson
;; Keywords: idna, idn, domain name, internationalization
;; This file is part of GNU Libidn.
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; A simple wrapper around the command line "idn" utility in GNU
;; Libidn to make IDNA ToASCII and ToUnicode operations available in
;; Emacs.
;; Example:
;;
;; (idna-to-ascii "r�ksm�rg�s.gnu.org")
;; => "xn--rksmrgs-5wao1o.gnu.org"
;;
;; (idna-to-ascii "www.gnu.org")
;; => "www.gnu.org"
;;
;; (idna-to-unicode "xn--rksmrgs-5wao1o.gnu.org")
;; => "r�ksm�rg�s.gnu.org"
;;
;; (idna-to-unicode "www.gnu.org")
;; => "www.gnu.org"
;; Todo: Support AllowUnassigned and UseSTD3ASCIIRules somehow?
;; This package is useless unless your emacs has at least partial
;; support for the UTF-8 coding system.
;; Report bugs to bug-libidn@gnu.org.
;;; Code:
(defgroup idna nil
"Internationalizing Domain Names in Applications.")
(defcustom idna-program "idn"
"Name of the GNU Libidn \"idn\" application."
:type 'string
:group 'idna)
(defcustom idna-environment '("CHARSET=UTF-8")
"List of environment variable definitions prepended to `process-environment'."
:type '(repeat string)
:group 'idna)
(defcustom idna-to-ascii-parameters '("--quiet"
"--idna-to-ascii"
"--usestd3asciirules")
"Parameters passed to `idna-program' to invoke IDNA ToASCII mode."
:type '(repeat string)
:group 'idna)
(defcustom idna-to-unicode-parameters '("--quiet"
"--idna-to-unicode"
"--usestd3asciirules")
"Parameters passed `idna-program' to invoke IDNA ToUnicode mode."
:type '(repeat string)
:group 'idna)
;; Internal process handling:
(defvar idna-to-ascii-process nil
"Internal variable holding process for ToASCII.")
(defvar idna-to-ascii-response nil
"Internal variable holding response data received from ToASCII process.")
(defun idna-to-ascii-response-clear ()
(setq idna-to-ascii-response nil))
(defun idna-to-ascii-response ()
(while (and (eq (process-status idna-to-ascii-process) 'run)
(null idna-to-ascii-response))
(accept-process-output idna-to-ascii-process 1))
idna-to-ascii-response)
(defun idna-to-ascii-filter (process string)
(setq idna-to-ascii-response (concat idna-to-ascii-response string)))
(defun idna-to-ascii-process ()
(if (and idna-to-ascii-process
(eq (process-status idna-to-ascii-process) 'run))
idna-to-ascii-process
(if idna-to-ascii-process
(condition-case ()
(kill-process idna-to-ascii-process)
(error)))
(when (setq idna-to-ascii-process
(let ((process-environment (append idna-environment
process-environment)))
(apply 'start-process "idna" nil idna-program
idna-to-ascii-parameters)))
(set-process-filter idna-to-ascii-process 'idna-to-ascii-filter)
(set-process-coding-system idna-to-ascii-process 'utf-8 'utf-8)
(process-kill-without-query idna-to-ascii-process))
idna-to-ascii-process))
(defvar idna-to-unicode-process nil
"Internal variable holding process for ToASCII.")
(defvar idna-to-unicode-response nil
"Internal variable holding response data received from ToASCII process.")
(defun idna-to-unicode-response-clear ()
(setq idna-to-unicode-response nil))
(defun idna-to-unicode-response ()
(while (and (eq (process-status idna-to-unicode-process) 'run)
(null idna-to-unicode-response))
(accept-process-output idna-to-unicode-process 1))
idna-to-unicode-response)
(defun idna-to-unicode-filter (process string)
(setq idna-to-unicode-response (concat idna-to-unicode-response string)))
(defun idna-to-unicode-process ()
(if (and idna-to-unicode-process
(eq (process-status idna-to-unicode-process) 'run))
idna-to-unicode-process
(if idna-to-unicode-process
(condition-case ()
(kill-process idna-to-unicode-process)
(error)))
(when (setq idna-to-unicode-process
(let ((process-environment (append idna-environment
process-environment)))
(apply 'start-process "idna" nil idna-program
idna-to-unicode-parameters)))
(set-process-filter idna-to-unicode-process 'idna-to-unicode-filter)
(set-process-coding-system idna-to-unicode-process 'utf-8 'utf-8)
(process-kill-without-query idna-to-unicode-process))
idna-to-unicode-process))
;; IDNA Elisp API:
(defun idna-to-ascii (str)
"Returns an ASCII Compatible Encoding (ACE) of STR.
It is computed by the IDNA ToASCII operation, after converting the
input to UTF-8."
(let ((proc (idna-to-ascii-process))
string)
(if (null proc)
(error "Cannot start idn application (to-ascii)")
(idna-to-ascii-response-clear)
(process-send-string proc (concat str "\n"))
(setq string (idna-to-ascii-response))
(if (and string (string= (substring string (1- (length string))) "\n"))
(substring string 0 (1- (length string)))
string))))
(defun idna-to-unicode (str)
"Returns a possibly multibyte string after decoding STR.
It is computed by the IDNA ToUnicode operation."
(let ((proc (idna-to-unicode-process))
string)
(if (null proc)
(error "Cannot start idn application (to-unicode)")
(idna-to-unicode-response-clear)
(process-send-string proc (concat str "\n"))
(setq string (idna-to-unicode-response))
(if (and string (string= (substring string (1- (length string))) "\n"))
(substring string 0 (1- (length string)))
string))))
(defun idna-shutdown ()
"Kill the IDNA related processes."
(interactive)
(if (and idna-to-ascii-process
(eq (process-status idna-to-ascii-process) 'run))
(kill-process idna-to-ascii-process))
(if (and idna-to-unicode-process
(eq (process-status idna-to-unicode-process) 'run))
(kill-process idna-to-unicode-process)))
(provide 'idna)
;;; idna.el ends here