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3180897ccc
entries. (po-find-charset): Doc fix. Remove interactive spec. (po): Provide. (po-find-file-coding-system-guts): Re-written to use coding-system-alist, and code-pages, not codepage stuff.
126 lines
4.8 KiB
EmacsLisp
126 lines
4.8 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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'(("ASCII" . undecided)
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("ANSI_X3.4-1968" . undecided)
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("US-ASCII" . undecided))
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"Alist of coding system versus GNU libc/libiconv canonical charset name.
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Contains canonical charset names that don't correspond to coding systems.")
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(defun po-find-charset (filename)
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"Return PO charset value for FILENAME."
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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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"Return a (DECODING . ENCODING) pair for OPERATION on PO file FILENAME.
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Do so according to FILENAME's declared charset."
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(and
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(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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assoc)
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(list (cond
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((setq assoc
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(assoc-ignore-case charset
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po-content-type-charset-alist))
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(cdr assoc))
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((or (setq assoc (assoc-ignore-case charset coding-system-alist))
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(setq assoc
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(assoc-ignore-case (subst-char-in-string ?_ ?-
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charset)
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coding-system-alist)))
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(intern (car assoc)))
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;; In principle we should also check the `mime-charset'
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;; property of everything in the base coding system
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;; list, but there should always be a coding system
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;; corresponding to the MIME name.
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((featurep 'code-pages)
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;; Give up.
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'raw-text)
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(t
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;; Try again with code-pages loaded. Maybe it's best
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;; to require it initially?
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(require 'code-pages nil t)
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(if (or
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(setq assoc (assoc-ignore-case charset coding-system-alist))
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(setq assoc (assoc-ignore-case (subst-char-in-string
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?_ ?- charset)
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coding-system-alist)))
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(intern (car assoc))
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'raw-text))))))))
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;;;###autoload
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(defun po-find-file-coding-system (arg-list)
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"Return a (DECODING . ENCODING) pair, according to PO file's 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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(provide 'po)
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;;; po.el ends here
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