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efe7ebe3d5
car of each association to a string. (po-find-file-coding-system-guts): If the charset matches a name of a codepage, set up that codepage and return it as a coding system to decode the file.
186 lines
6.9 KiB
EmacsLisp
186 lines
6.9 KiB
EmacsLisp
;;; po.el --- basic support of PO translation files -*- coding: latin-1; -*-
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;; Copyright (C) 1995-1998, 2000-2002 Free Software Foundation, Inc.
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;; Authors: François Pinard <pinard@iro.umontreal.ca>,
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;; Greg McGary <gkm@magilla.cichlid.com>,
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;; Bruno Haible <bruno@clisp.org>.
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;; Keywords: i18n, files
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package makes sure visiting PO files decodes them correctly,
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;; according to the Charset= header in the PO file. For more support
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;; for editing PO files, see po-mode.el.
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;;; Code:
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(defconst po-content-type-charset-alist
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'(; Note: Emacs 21 doesn't support all encodings, thus the missing entries.
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("ASCII" . undecided)
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("ANSI_X3.4-1968" . undecided)
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("US-ASCII" . undecided)
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("ISO-8859-1" . iso-8859-1)
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("ISO_8859-1" . iso-8859-1)
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("ISO-8859-2" . iso-8859-2)
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("ISO_8859-2" . iso-8859-2)
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("ISO-8859-3" . iso-8859-3)
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("ISO_8859-3" . iso-8859-3)
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("ISO-8859-4" . iso-8859-4)
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("ISO_8859-4" . iso-8859-4)
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("ISO-8859-5" . iso-8859-5)
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("ISO_8859-5" . iso-8859-5)
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;("ISO-8859-6" . ??)
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;("ISO_8859-6" . ??)
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("ISO-8859-7" . iso-8859-7)
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("ISO_8859-7" . iso-8859-7)
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("ISO-8859-8" . iso-8859-8)
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("ISO_8859-8" . iso-8859-8)
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("ISO-8859-9" . iso-8859-9)
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("ISO_8859-9" . iso-8859-9)
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;("ISO-8859-13" . ??)
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;("ISO_8859-13" . ??)
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("ISO-8859-15" . iso-8859-15) ; requires Emacs 21
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("ISO_8859-15" . iso-8859-15) ; requires Emacs 21
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("KOI8-R" . koi8-r)
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;("KOI8-U" . ??)
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("CP437" . cp437) ; requires Emacs 20
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("CP775" . cp775) ; requires Emacs 20
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("CP850" . cp850) ; requires Emacs 20
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("CP852" . cp852) ; requires Emacs 20
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("CP855" . cp855) ; requires Emacs 20
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;("CP856" . ??)
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("CP857" . cp857) ; requires Emacs 20
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("CP861" . cp861) ; requires Emacs 20
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("CP862" . cp862) ; requires Emacs 20
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("CP864" . cp864) ; requires Emacs 20
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("CP865" . cp865) ; requires Emacs 20
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("CP866" . cp866) ; requires Emacs 21
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("CP869" . cp869) ; requires Emacs 20
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;("CP874" . ??)
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;("CP922" . ??)
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;("CP932" . ??)
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;("CP943" . ??)
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;("CP949" . ??)
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;("CP950" . ??)
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;("CP1046" . ??)
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;("CP1124" . ??)
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;("CP1129" . ??)
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("CP1250" . cp1250) ; requires Emacs 20
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("CP1251" . cp1251) ; requires Emacs 20
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("CP1252" . iso-8859-1) ; approximation
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("CP1253" . cp1253) ; requires Emacs 20
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("CP1254" . iso-8859-9) ; approximation
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("CP1255" . iso-8859-8) ; approximation
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;("CP1256" . ??)
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("CP1257" . cp1257) ; requires Emacs 20
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("GB2312" . cn-gb-2312) ; also named 'gb2312' in XEmacs 21 or Emacs 21
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; also named 'euc-cn' in Emacs 20 or Emacs 21
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("EUC-JP" . euc-jp)
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("EUC-KR" . euc-kr)
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;("EUC-TW" . ??)
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("BIG5" . big5)
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;("BIG5-HKSCS" . ??)
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;("GBK" . ??)
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;("GB18030" . ??)
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("SHIFT_JIS" . shift_jis)
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;("JOHAB" . ??)
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("TIS-620" . tis-620) ; requires Emacs 20 or Emacs 21
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("VISCII" . viscii) ; requires Emacs 20 or Emacs 21
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("UTF-8" . utf-8) ; requires Mule-UCS in Emacs 20, or Emacs 21
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)
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"How to convert a GNU libc/libiconv canonical charset name as seen in
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Content-Type into a Mule coding system.")
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(defun po-find-charset (filename)
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"Return PO file charset value."
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(interactive)
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(let ((charset-regexp
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"^\"Content-Type: text/plain;[ \t]*charset=\\(.*\\)\\\\n\"")
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(short-read nil))
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;; Try the first 4096 bytes. In case we cannot find the charset value
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;; within the first 4096 bytes (the PO file might start with a long
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;; comment) try the next 4096 bytes repeatedly until we'll know for sure
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;; we've checked the empty header entry entirely.
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(while (not (or short-read (re-search-forward "^msgid" nil t)))
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(save-excursion
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(goto-char (point-max))
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(let ((pair (insert-file-contents-literally filename nil
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(1- (point))
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(1- (+ (point) 4096)))))
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(setq short-read (< (nth 1 pair) 4096)))))
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(cond ((re-search-forward charset-regexp nil t) (match-string 1))
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(short-read nil)
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;; We've found the first msgid; maybe, only a part of the msgstr
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;; value was loaded. Load the next 1024 bytes; if charset still
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;; isn't available, give up.
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(t (save-excursion
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(goto-char (point-max))
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(insert-file-contents-literally filename nil
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(1- (point))
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(1- (+ (point) 1024))))
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(if (re-search-forward charset-regexp nil t)
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(match-string 1))))))
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(defun po-find-file-coding-system-guts (operation filename)
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"\
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Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
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Called through file-coding-system-alist, before the file is visited for real."
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(and (eq operation 'insert-file-contents)
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(file-exists-p filename)
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(with-temp-buffer
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(let* ((coding-system-for-read 'no-conversion)
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(charset (or (po-find-charset filename) "ascii"))
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(charset-upper (upcase charset))
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(charset-lower (downcase charset))
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(candidate
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(cdr (assoc charset-upper po-content-type-charset-alist)))
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(try (or candidate (intern-soft charset-lower))))
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(list (cond ((and try (coding-system-p try))
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try)
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((and try
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(string-match "\\`cp[1-9][0-9][0-9]?\\'"
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(symbol-name try))
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(assoc (substring (symbol-name try) 2)
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(cp-supported-codepages)))
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(codepage-setup (substring (symbol-name try) 2))
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try)
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((and (string-match "\\`cp[1-9][0-9][0-9]?\\'"
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charset-lower)
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(assoc (substring charset-lower 2)
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(cp-supported-codepages)))
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(codepage-setup (substring charset-lower 2))
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(intern charset-lower))
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(t
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'no-conversion)))))))
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;;;###autoload
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(defun po-find-file-coding-system (arg-list)
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"\
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Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
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Called through file-coding-system-alist, before the file is visited for real."
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(po-find-file-coding-system-guts (car arg-list) (car (cdr arg-list))))
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;; This is for XEmacs.
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;(defun po-find-file-coding-system (operation filename)
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; "\
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;Return a Mule (DECODING . ENCODING) pair, according to PO file charset.
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;Called through file-coding-system-alist, before the file is visited for real."
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; (po-find-file-coding-system-guts operation filename))
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