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;;; punycode.el --- An ASCII compatible Unicode encoding format.
;; Copyright (C) 2003-2016 Simon Josefsson
;; Keywords: punycode, idna, idn, unicode, encoding
;; 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 punycode operations available in Emacs.
;; Example:
;;
;; (punycode-encode "r�ksm�rg�s")
;; => "rksmrgs-5wao1o"
;;
;; (punycode-encode "foo")
;; => "foo-"
;;
;; (punycode-decode "rksmrgs-5wao1o")
;; => "r�ksm�rg�s"
;;
;; (punycode-decode "foo-")
;; => "foo"
;; 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 punycode nil
"Punycode: An ASCII compatible Unicode encoding format.")
(defcustom punycode-program "idn"
"Name of the GNU Libidn \"idn\" application."
:type 'string
:group 'punycode)
(defcustom punycode-environment '("CHARSET=UTF-8")
"List of environment variable definitions prepended to `process-environment'."
:type '(repeat string)
:group 'punycode)
(defcustom punycode-encode-parameters '("--quiet" "--punycode-encode")
"Parameters passed to `punycode-program' to invoke punycode encoding mode."
:type '(repeat string)
:group 'punycode)
(defcustom punycode-decode-parameters '("--quiet" "--punycode-decode")
"Parameters passed to `punycode-program' to invoke punycode decoding mode."
:type '(repeat string)
:group 'punycode)
;; Internal process handling:
(defvar punycode-encode-process nil
"Internal variable holding process for punycode encoding.")
(defvar punycode-encode-response nil
"Internal variable holding response data received from punycode process.")
(defun punycode-encode-response-clear ()
(setq punycode-encode-response nil))
(defun punycode-encode-response ()
(while (and (eq (process-status punycode-encode-process) 'run)
(null punycode-encode-response))
(accept-process-output punycode-encode-process 1))
punycode-encode-response)
(defun punycode-encode-filter (process string)
(setq punycode-encode-response (concat punycode-encode-response string)))
(defun punycode-encode-process ()
(if (and punycode-encode-process
(eq (process-status punycode-encode-process) 'run))
punycode-encode-process
(if punycode-encode-process
(condition-case ()
(kill-process punycode-encode-process)
(error)))
(when (setq punycode-encode-process
(let ((process-environment (append punycode-environment
process-environment)))
(apply 'start-process "punycode" nil punycode-program
punycode-encode-parameters)))
(set-process-filter punycode-encode-process 'punycode-encode-filter)
(set-process-coding-system punycode-encode-process 'utf-8 'utf-8)
(process-kill-without-query punycode-encode-process))
punycode-encode-process))
(defvar punycode-decode-process nil
"Internal variable holding process for punycode encoding.")
(defvar punycode-decode-response nil
"Internal variable holding response data received from punycode process.")
(defun punycode-decode-response-clear ()
(setq punycode-decode-response nil))
(defun punycode-decode-response ()
(while (and (eq (process-status punycode-decode-process) 'run)
(null punycode-decode-response))
(accept-process-output punycode-decode-process 1))
punycode-decode-response)
(defun punycode-decode-filter (process string)
(setq punycode-decode-response (concat punycode-decode-response string)))
(defun punycode-decode-process ()
(if (and punycode-decode-process
(eq (process-status punycode-decode-process) 'run))
punycode-decode-process
(if punycode-decode-process
(condition-case ()
(kill-process punycode-decode-process)
(error)))
(when (setq punycode-decode-process
(let ((process-environment (append punycode-environment
process-environment)))
(apply 'start-process "punycode" nil punycode-program
punycode-decode-parameters)))
(set-process-filter punycode-decode-process 'punycode-decode-filter)
(set-process-coding-system punycode-decode-process 'utf-8 'utf-8)
(process-kill-without-query punycode-decode-process))
punycode-decode-process))
;; Punycode Elisp API:
(defun punycode-encode (str)
"Returns a Punycode encoding of STR."
(let ((proc (punycode-encode-process))
string)
(if (null proc)
(error "Cannot start idn application")
(punycode-encode-response-clear)
(process-send-string proc (concat str "\n"))
(setq string (punycode-encode-response))
(if (and string (string= (substring string (1- (length string))) "\n"))
(substring string 0 (1- (length string)))
string))))
(defun punycode-decode (str)
"Returns a possibly multibyte string which is the punycode decoding of STR."
(let ((proc (punycode-decode-process))
string)
(if (null proc)
(error "Cannot start idn application")
(punycode-decode-response-clear)
(process-send-string proc (concat str "\n"))
(setq string (punycode-decode-response))
(if (and string (string= (substring string (1- (length string))) "\n"))
(substring string 0 (1- (length string)))
string))))
(defun punycode-shutdown ()
"Kill the punycode related process."
(interactive)
(if (and punycode-decode-process
(eq (process-status punycode-decode-process) 'run))
(kill-process punycode-decode-process))
(if (and punycode-encode-process
(eq (process-status punycode-encode-process) 'run))
(kill-process punycode-encode-process)))
(provide 'punycode)
;;; punycode.el ends here