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- ;;; punycode.el --- An ASCII compatible Unicode encoding format.
-
- ;; Copyright (C) 2003, 2005 Simon Josefsson
- ;; Keywords: punycode, idna, idn, unicode, encoding
-
- ;; This file is part of GNU Libidn.
-
- ;; GNU Libidn 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 Libidn 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 Libidn; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- ;; Boston, MA 02110-1301, USA.
-
- ;;; Commentary:
-
- ;; A simple wrapper around the command line "idn" utility in GNU
- ;; Libidn to make punycode operations available in Emacs.
-
- ;; Example:
- ;;
- ;; (punycode-encode "rΣksm÷rgσs")
- ;; => "rksmrgs-5wao1o"
- ;;
- ;; (punycode-encode "foo")
- ;; => "foo-"
- ;;
- ;; (punycode-decode "rksmrgs-5wao1o")
- ;; => "rΣksm÷rgσs"
- ;;
- ;; (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
-