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228 lines
7.3 KiB
EmacsLisp
228 lines
7.3 KiB
EmacsLisp
;;; china-util.el --- utilities for Chinese
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;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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;; Licensed to the Free Software Foundation.
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;; Keywords: mule, multilingual, Chinese
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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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;;; Code:
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;;;###autoload
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(defun setup-chinese-gb-environment ()
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"Setup multilingual environment (MULE) for Chinese GB2312 users."
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(interactive)
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(setup-english-environment)
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(set-default-coding-systems 'chinese-iso-8bit)
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(setq coding-category-iso-8-2 'chinese-iso-8bit)
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(setq coding-category-iso-7-else 'chinese-iso-7bit)
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(setq coding-category-big5 'chinese-big5)
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(set-coding-priority
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'(coding-category-iso-7
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coding-category-iso-7-else
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coding-category-iso-8-2
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coding-category-big5
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coding-category-iso-8-1
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coding-category-emacs-mule
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coding-category-iso-8-else))
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(setq-default buffer-file-coding-system 'chinese-iso-8bit)
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(setq default-terminal-coding-system 'chinese-iso-8bit)
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(setq default-keyboard-coding-system 'chinese-iso-8bit)
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(setq default-input-method "chinese-py-punct"))
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;;;###autoload
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(defun setup-chinese-big5-environment ()
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"Setup multilingual environment (MULE) for Chinese Big5 users."
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(interactive)
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(setup-english-environment)
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(set-default-coding-systems 'chinese-big5)
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(setq coding-category-iso-8-2 'chinese-big5)
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(setq coding-category-iso-7-else 'chinese-iso-7bit)
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(setq coding-category-big5 'chinese-big5)
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(set-coding-priority
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'(coding-category-iso-7
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coding-category-iso-7-else
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coding-category-big5
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coding-category-iso-8-2
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coding-category-emacs-mule
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coding-category-iso-8-else))
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(setq-default buffer-file-coding-system 'chinese-big5)
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(setq default-terminal-coding-system 'chinese-big5)
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(setq default-keyboard-coding-system 'chinese-big5)
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(setq default-input-method "chinese-py-punct-b5"))
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;;;###autoload
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(defun setup-chinese-cns-environment ()
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"Setup multilingual environment (MULE) for Chinese CNS11643 family users."
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(interactive)
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(setup-english-environment)
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(setq coding-category-iso-7-else 'chinese-iso-7bit)
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(setq coding-category-big5 'chinese-big5)
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(setq coding-category-iso-8-2 'chinese-big5)
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(set-default-coding-systems 'chinese-iso-7bit)
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(set-coding-priority
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'(coding-category-iso-7
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coding-category-iso-7-else
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coding-category-iso-8-2
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coding-category-big5
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coding-category-iso-7-else))
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(setq-default buffer-file-coding-system 'chinese-iso-7bit)
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(setq default-terminal-coding-system 'chinese-iso-7bit)
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(setq default-keyboard-coding-system 'chinese-iso-7bit)
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(setq default-input-method "chinese-quick-cns"))
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;; Hz/ZW encoding stuffs
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;; HZ is an encoding method for Chinese character set GB2312 used
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;; widely in Internet. It is very similar to 7-bit environment of
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;; ISO-2022. The difference is that HZ uses the sequence "~{" and
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;; "~}" for designating GB2312 and ASCII respectively, hence, it
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;; doesn't uses ESC (0x1B) code.
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;; ZW is another encoding method for Chinese character set GB2312. It
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;; encodes Chinese characters line by line by starting each line with
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;; the sequence "zW". It also uses only 7-bit as HZ.
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;; ISO-2022 escape sequence to designate GB2312.
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(defvar iso2022-gb-designation "\e$A")
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;; HZ escape sequence to designate GB2312.
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(defvar hz-gb-designnation "~{")
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;; ISO-2022 escape sequence to designate ASCII.
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(defvar iso2022-ascii-designation "\e(B")
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;; HZ escape sequence to designate ASCII.
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(defvar hz-ascii-designnation "~}")
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;; Regexp of ZW sequence to start GB2312.
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(defvar zw-start-gb "^zW")
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;; Regexp for start of GB2312 in an encoding mixture of HZ and ZW.
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(defvar hz/zw-start-gb (concat hz-gb-designnation "\\|" zw-start-gb))
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(defvar decode-hz-line-continuation nil
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"Flag to tell if we should care line continuation convention of Hz.")
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;;;###autoload
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(defun decode-hz-region (beg end)
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"Decode HZ/ZW encoded text in the current region.
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Return the length of resulting text."
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(interactive "r")
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(save-excursion
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(save-restriction
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(narrow-to-region beg end)
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;; We, at first, convert HZ/ZW to `iso-2022-7bit',
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;; then decode it.
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;; "~\n" -> "\n"
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(goto-char (point-min))
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(while (search-forward "~" nil t)
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(if (= (following-char) ?\n) (delete-char -1))
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(if (not (eobp)) (forward-char 1)))
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;; "^zW...\n" -> Chinese GB2312
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;; "~{...~}" -> Chinese GB2312
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(goto-char (point-min))
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(let ((chinese-found nil))
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(while (re-search-forward hz/zw-start-gb nil t)
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(if (= (char-after (match-beginning 0)) ?z)
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;; ZW -> iso-2022-7bit
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(progn
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(delete-char -2)
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(insert iso2022-gb-designation)
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(end-of-line)
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(insert iso2022-ascii-designation))
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;; HZ -> iso-2022-7bit
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(delete-char -2)
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(insert iso2022-gb-designation)
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(let ((pos (save-excursion (end-of-line) (point))))
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(if (search-forward hz-ascii-designnation pos t)
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(replace-match iso2022-ascii-designation)
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(if (not decode-hz-line-continuation)
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(insert iso2022-ascii-designation)))))
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(setq chinese-found t))
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(if (or chinese-found
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(let ((enable-multibyte-characters nil))
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;; Here we check if the text contains EUC (China) codes.
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;; If any, we had better decode them also.
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(goto-char (point-min))
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(re-search-forward "[\240-\377]" nil t)))
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(decode-coding-region (point-min) (point-max) 'euc-china)))
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;; "~~" -> "~"
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(goto-char (point-min))
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(while (search-forward "~~" nil t) (delete-char -1))
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(- (point-max) (point-min)))))
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;;;###autoload
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(defun decode-hz-buffer ()
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"Decode HZ/ZW encoded text in the current buffer."
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(interactive)
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(decode-hz-region (point-min) (point-max)))
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;;;###autoload
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(defun encode-hz-region (beg end)
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"Encode the text in the current region to HZ.
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Return the length of resulting text."
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(interactive "r")
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(save-excursion
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(save-restriction
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(narrow-to-region beg end)
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;; "~" -> "~~"
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(goto-char (point-min))
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(while (search-forward "~" nil t) (insert ?~))
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;; Chinese GB2312 -> "~{...~}"
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(goto-char (point-min))
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(if (re-search-forward "\\cc" nil t)
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(let ((enable-multibyte-characters nil)
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pos)
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(goto-char (setq pos (match-beginning 0)))
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(encode-coding-region pos (point-max) 'iso-2022-7bit)
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(goto-char pos)
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(while (search-forward iso2022-gb-designation nil t)
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(delete-char -3)
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(insert hz-gb-designnation))
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(goto-char pos)
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(while (search-forward iso2022-ascii-designation nil t)
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(delete-char -3)
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(insert hz-ascii-designnation))))
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(- (point-max) (point-min)))))
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;;;###autoload
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(defun encode-hz-buffer ()
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"Encode the text in the current buffer to HZ."
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(interactive)
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(encode-hz-region (point-min) (point-max)))
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;;
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(provide 'china-util)
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;;; china-util.el ends here
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