;;; po.el --- basic support of PO translation files -*- coding: utf-8; -*- ;; Copyright (C) 1995-1998, 2000-2002 Free Software Foundation, Inc. ;; Authors: François Pinard , ;; Greg McGary , ;; Bruno Haible . ;; 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 2, 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; see the file COPYING. If not, write to the ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, ;; Boston, MA 02111-1307, USA. ;;; Commentary: ;; Basic support for viewing PO files. ;; Usage: ;; (autoload 'po-find-file-coding-system "po") ;; (modify-coding-system-alist 'file "\\.po\\'\\|\\.po\\." ;; 'po-find-file-coding-system) ;;; Code: ; Make the cpnnn codesets available. (if (not (string-match "XEmacs\\|Lucid" emacs-version)) (mapc #'codepage-setup (mapcar #'car (cp-supported-codepages)))) (defconst po-content-type-charset-alist '(; Note: Emacs 21 doesn't support all encodings, thus the missing entries. (ASCII . undecided) (ANSI_X3.4-1968 . undecided) (US-ASCII . undecided) (ISO-8859-1 . iso-8859-1) (ISO_8859-1 . iso-8859-1) (ISO-8859-2 . iso-8859-2) (ISO_8859-2 . iso-8859-2) (ISO-8859-3 . iso-8859-3) (ISO_8859-3 . iso-8859-3) (ISO-8859-4 . iso-8859-4) (ISO_8859-4 . iso-8859-4) (ISO-8859-5 . iso-8859-5) (ISO_8859-5 . iso-8859-5) ;(ISO-8859-6 . ??) ;(ISO_8859-6 . ??) (ISO-8859-7 . iso-8859-7) (ISO_8859-7 . iso-8859-7) (ISO-8859-8 . iso-8859-8) (ISO_8859-8 . iso-8859-8) (ISO-8859-9 . iso-8859-9) (ISO_8859-9 . iso-8859-9) ;(ISO-8859-13 . ??) ;(ISO_8859-13 . ??) (ISO-8859-15 . iso-8859-15) ; requires Emacs 21 (ISO_8859-15 . iso-8859-15) ; requires Emacs 21 (KOI8-R . koi8-r) ;(KOI8-U . ??) (CP437 . cp437) ; requires Emacs 20 (CP775 . cp775) ; requires Emacs 20 (CP850 . cp850) ; requires Emacs 20 (CP852 . cp852) ; requires Emacs 20 (CP855 . cp855) ; requires Emacs 20 ;(CP856 . ??) (CP857 . cp857) ; requires Emacs 20 (CP861 . cp861) ; requires Emacs 20 (CP862 . cp862) ; requires Emacs 20 (CP864 . cp864) ; requires Emacs 20 (CP865 . cp865) ; requires Emacs 20 (CP866 . cp866) ; requires Emacs 21 (CP869 . cp869) ; requires Emacs 20 ;(CP874 . ??) ;(CP922 . ??) ;(CP932 . ??) ;(CP943 . ??) ;(CP949 . ??) ;(CP950 . ??) ;(CP1046 . ??) ;(CP1124 . ??) ;(CP1129 . ??) (CP1250 . cp1250) ; requires Emacs 20 (CP1251 . cp1251) ; requires Emacs 20 (CP1252 . iso-8859-1) ; approximation (CP1253 . cp1253) ; requires Emacs 20 (CP1254 . iso-8859-9) ; approximation (CP1255 . iso-8859-8) ; approximation ;(CP1256 . ??) (CP1257 . cp1257) ; requires Emacs 20 (GB2312 . cn-gb-2312) ; also named 'gb2312' in XEmacs 21 or Emacs 21 ; also named 'euc-cn' in Emacs 20 or Emacs 21 (EUC-JP . euc-jp) (EUC-KR . euc-kr) ;(EUC-TW . ??) (BIG5 . big5) ;(BIG5-HKSCS . ??) ;(GBK . ??) ;(GB18030 . ??) (SHIFT_JIS . shift_jis) ;(JOHAB . ??) (TIS-620 . tis-620) ; requires Emacs 20 or Emacs 21 (VISCII . viscii) ; requires Emacs 20 or Emacs 21 (UTF-8 . utf-8) ; requires Mule-UCS in Emacs 20, or Emacs 21 ) "How to convert a GNU libc/libiconv canonical charset name as seen in Content-Type into a Mule coding system.") (defun po-find-charset (filename) "Return PO file charset value." (interactive) (let ((charset-regexp "^\"Content-Type: text/plain;[ \t]*charset=\\(.*\\)\\\\n\"") (short-read nil)) ;; Try the first 4096 bytes. In case we cannot find the charset value ;; within the first 4096 bytes (the PO file might start with a long ;; comment) try the next 4096 bytes repeatedly until we'll know for sure ;; we've checked the empty header entry entirely. (while (not (or short-read (re-search-forward "^msgid" nil t))) (save-excursion (goto-char (point-max)) (let ((pair (insert-file-contents-literally filename nil (1- (point)) (1- (+ (point) 4096))))) (setq short-read (< (nth 1 pair) 4096))))) (cond (short-read nil) ((re-search-forward charset-regexp nil t) (match-string 1)) ;; We've found the first msgid; maybe, only a part of the msgstr ;; value was loaded. Load the next 1024 bytes; if charset still ;; isn't available, give up. (t (save-excursion (goto-char (point-max)) (insert-file-contents-literally filename nil (1- (point)) (1- (+ (point) 1024)))) (if (re-search-forward charset-regexp nil t) (match-string 1)))))) (defun po-find-file-coding-system-guts (operation filename) "\ Return a Mule (DECODING . ENCODING) pair, according to PO file charset. Called through file-coding-system-alist, before the file is visited for real." (and (eq operation 'insert-file-contents) (file-exists-p filename) (po-with-temp-buffer (let* ((coding-system-for-read 'no-conversion) (charset (or (po-find-charset filename) "ascii")) (charset-upper (intern (upcase charset))) (charset-lower (intern (downcase charset)))) (list (or (cdr (assq charset-upper po-content-type-charset-alist)) (if (memq charset-lower (coding-system-list)) charset-lower 'no-conversion))))))) ;;;###autoload (defun po-find-file-coding-system (arg-list) "\ Return a Mule (DECODING . ENCODING) pair, according to PO file charset. Called through file-coding-system-alist, before the file is visited for real." (po-find-file-coding-system-guts (car arg-list) (car (cdr arg-list)))) ;; This is for XEmacs. ;(defun po-find-file-coding-system (operation filename) ; "\ ;Return a Mule (DECODING . ENCODING) pair, according to PO file charset. ;Called through file-coding-system-alist, before the file is visited for real." ; (po-find-file-coding-system-guts operation filename))