mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-26 10:49:33 +00:00
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; -*-
|
|
|
|
;; Copyright (C) 1995-1998, 2000-2002 Free Software Foundation, Inc.
|
|
|
|
;; Authors: François Pinard <pinard@iro.umontreal.ca>,
|
|
;; Greg McGary <gkm@magilla.cichlid.com>,
|
|
;; Bruno Haible <bruno@clisp.org>.
|
|
;; Keywords: i18n, files
|
|
|
|
;; 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:
|
|
|
|
;; This package makes sure visiting PO files decodes them correctly,
|
|
;; according to the Charset= header in the PO file. For more support
|
|
;; for editing PO files, see po-mode.el.
|
|
|
|
;;; Code:
|
|
|
|
(defconst po-content-type-charset-alist
|
|
'(("ASCII" . undecided)
|
|
("ANSI_X3.4-1968" . undecided)
|
|
("US-ASCII" . undecided))
|
|
"Alist of coding system versus GNU libc/libiconv canonical charset name.
|
|
Contains canonical charset names that don't correspond to coding systems.")
|
|
|
|
(defun po-find-charset (filename)
|
|
"Return PO charset value for FILENAME."
|
|
(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 ((re-search-forward charset-regexp nil t) (match-string 1))
|
|
(short-read nil)
|
|
;; 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 (DECODING . ENCODING) pair for OPERATION on PO file FILENAME.
|
|
Do so according to FILENAME's declared charset."
|
|
(and
|
|
(eq operation 'insert-file-contents)
|
|
(file-exists-p filename)
|
|
(with-temp-buffer
|
|
(let* ((coding-system-for-read 'no-conversion)
|
|
(charset (or (po-find-charset filename) "ascii"))
|
|
assoc)
|
|
(list (cond
|
|
((setq assoc
|
|
(assoc-ignore-case charset
|
|
po-content-type-charset-alist))
|
|
(cdr assoc))
|
|
((or (setq assoc (assoc-ignore-case charset coding-system-alist))
|
|
(setq assoc
|
|
(assoc-ignore-case (subst-char-in-string ?_ ?-
|
|
charset)
|
|
coding-system-alist)))
|
|
(intern (car assoc)))
|
|
;; In principle we should also check the `mime-charset'
|
|
;; property of everything in the base coding system
|
|
;; list, but there should always be a coding system
|
|
;; corresponding to the MIME name.
|
|
((featurep 'code-pages)
|
|
;; Give up.
|
|
'raw-text)
|
|
(t
|
|
;; Try again with code-pages loaded. Maybe it's best
|
|
;; to require it initially?
|
|
(require 'code-pages nil t)
|
|
(if (or
|
|
(setq assoc (assoc-ignore-case charset coding-system-alist))
|
|
(setq assoc (assoc-ignore-case (subst-char-in-string
|
|
?_ ?- charset)
|
|
coding-system-alist)))
|
|
(intern (car assoc))
|
|
'raw-text))))))))
|
|
|
|
;;;###autoload
|
|
(defun po-find-file-coding-system (arg-list)
|
|
"Return a (DECODING . ENCODING) pair, according to PO file's 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))
|
|
|
|
(provide 'po)
|
|
|
|
;;; po.el ends here
|