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|
;;; chinese.el --- support for Chinese -*- coding: iso-2022-7bit; -*-
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; Keywords: multilingual, Chinese
;; 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:
;; For Chinese, three character sets GB2312, BIG5, and CNS11643 are
;; supported.
;;; Code:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Chinese (general)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(make-coding-system
'iso-2022-cn 2 ?C
"ISO 2022 based 7bit encoding for Chinese GB and CNS (MIME:ISO-2022-CN)."
'(ascii
(nil chinese-gb2312 chinese-cns11643-1)
(nil chinese-cns11643-2)
nil
nil ascii-eol ascii-cntl seven locking-shift single-shift nil nil nil
init-bol)
'((safe-charsets ascii chinese-gb2312 chinese-cns11643-1 chinese-cns11643-2)
(mime-charset . iso-2022-cn)))
(define-coding-system-alias 'chinese-iso-7bit 'iso-2022-cn)
(make-coding-system
'iso-2022-cn-ext 2 ?C
"ISO 2022 based 7bit encoding for Chinese GB and CNS (MIME:ISO-2022-CN-EXT)."
'(ascii
(nil chinese-gb2312 chinese-cns11643-1)
(nil chinese-cns11643-2)
(nil chinese-cns11643-3 chinese-cns11643-4 chinese-cns11643-5
chinese-cns11643-6 chinese-cns11643-7)
nil ascii-eol ascii-cntl seven locking-shift single-shift nil nil nil
init-bol)
'((safe-charsets ascii chinese-gb2312 chinese-cns11643-1 chinese-cns11643-2
chinese-cns11643-3 chinese-cns11643-4 chinese-cns11643-5
chinese-cns11643-6 chinese-cns11643-7)
(mime-charset . iso-2022-cn-ext)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Chinese GB2312 (simplified)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(make-coding-system
'chinese-iso-8bit 2 ?c
"ISO 2022 based EUC encoding for Chinese GB2312 (MIME:GB2312)."
'(ascii chinese-gb2312 nil nil
nil ascii-eol ascii-cntl nil nil nil nil)
'((safe-charsets ascii chinese-gb2312)
(mime-charset . gb2312)))
(define-coding-system-alias 'cn-gb-2312 'chinese-iso-8bit)
(define-coding-system-alias 'euc-china 'chinese-iso-8bit)
(define-coding-system-alias 'euc-cn 'chinese-iso-8bit)
(define-coding-system-alias 'cn-gb 'chinese-iso-8bit)
(define-coding-system-alias 'gb2312 'chinese-iso-8bit)
(make-coding-system
'chinese-hz 0 ?z
"Hz/ZW 7-bit encoding for Chinese GB2312 (MIME:HZ-GB-2312)."
nil
'((safe-charsets ascii chinese-gb2312)
(mime-charset . hz-gb-2312)
(post-read-conversion . post-read-decode-hz)
(pre-write-conversion . pre-write-encode-hz)))
(define-coding-system-alias 'hz-gb-2312 'chinese-hz)
(define-coding-system-alias 'hz 'chinese-hz)
(defun post-read-decode-hz (len)
(let ((pos (point))
(buffer-modified-p (buffer-modified-p))
last-coding-system-used)
(prog1
(decode-hz-region pos (+ pos len))
(set-buffer-modified-p buffer-modified-p))))
(defun pre-write-encode-hz (from to)
(let ((buf (current-buffer)))
(set-buffer (generate-new-buffer " *temp*"))
(if (stringp from)
(insert from)
(insert-buffer-substring buf from to))
(let (last-coding-system-used)
(encode-hz-region 1 (point-max)))
nil))
(set-language-info-alist
"Chinese-GB" '((charset chinese-gb2312 chinese-sisheng)
(coding-system chinese-iso-8bit iso-2022-cn chinese-hz)
(coding-priority chinese-iso-8bit chinese-big5 iso-2022-cn)
(input-method . "chinese-py-punct")
(features china-util)
(sample-text . "Chinese ($AVPND(B,$AFUM(;0(B,$A::So(B) $ADc:C(B")
(documentation . "Support for Chinese GB2312 character set."))
'("Chinese"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Chinese BIG5 (traditional)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(make-coding-system
'chinese-big5 3 ?B
"BIG5 8-bit encoding for Chinese (MIME:Big5)."
nil
'((safe-charsets ascii chinese-big5-1 chinese-big5-2)
(mime-charset . big5)
(charset-origin-alist (chinese-big5-1 "BIG5" encode-big5-char)
(chinese-big5-2 "BIG5" encode-big5-char))))
(define-coding-system-alias 'big5 'chinese-big5)
(define-coding-system-alias 'cn-big5 'chinese-big5)
;; Big5 font requires special encoding.
(define-ccl-program ccl-encode-big5-font
`(0
;; In: R0:chinese-big5-1 or chinese-big5-2
;; R1:position code 1
;; R2:position code 2
;; Out: R1:font code point 1
;; R2:font code point 2
((r2 = ((((r1 - ?\x21) * 94) + r2) - ?\x21))
(if (r0 == ,(charset-id 'chinese-big5-2)) (r2 += 6280))
(r1 = ((r2 / 157) + ?\xA1))
(r2 %= 157)
(if (r2 < ?\x3F) (r2 += ?\x40) (r2 += ?\x62))))
"CCL program to encode a Big5 code to code point of Big5 font.")
(setq font-ccl-encoder-alist
(cons (cons "big5" ccl-encode-big5-font) font-ccl-encoder-alist))
(set-language-info-alist
"Chinese-BIG5" '((charset chinese-big5-1 chinese-big5-2)
(coding-system chinese-big5 chinese-iso-7bit)
(coding-priority chinese-big5 iso-2022-cn chinese-iso-8bit)
(input-method . "chinese-py-punct-b5")
(features china-util)
(sample-text . "Cantonese ($(0GnM$(B,$(0N]0*Hd(B) $(0*/=((B, $(0+$)p(B")
(documentation . "Support for Chinese Big5 character set."))
'("Chinese"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Chinese CNS11643 (traditional)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defvar big5-to-cns (make-translation-table)
"Translation table for encoding to `euc-tw'.")
;; Could have been done by china-util loaded before.
(unless (get 'big5-to-cns 'translation-table)
(define-translation-table 'big5-to-cns big5-to-cns))
(define-ccl-program ccl-decode-euc-tw
;; CNS plane 1 needs either two or four bytes in EUC-TW encoding;
;; CNS planes 2 to 7 always need four bytes. In internal encoding of
;; Emacs, CNS planes 1 and 2 need three bytes, and planes 3 to 7 need
;; four bytes. Thus a buffer magnification value of 2 (for both
;; encoding and decoding) is sufficient.
`(2
;; we don't have enough registers to hold all charset-ids
((r4 = ,(charset-id 'chinese-cns11643-1))
(r5 = ,(charset-id 'chinese-cns11643-2))
(r6 = ,(charset-id 'chinese-cns11643-3))
(loop
(read-if (r0 < #x80)
;; ASCII
(write-repeat r0)
;; not ASCII
(if (r0 == #x8E)
;; single shift
(read-if (r1 < #xA1)
;; invalid byte
((write r0)
(write-repeat r1))
(if (r1 > #xA7)
;; invalid plane
((write r0)
(write-repeat r1))
;; OK, we have a plane
(read-if (r2 < #xA1)
;; invalid first byte
((write r0 r1)
(write-repeat r2))
(read-if (r3 < #xA1)
;; invalid second byte
((write r0 r1 r2)
(write-repeat r3))
;; CNS 1-7, finally
((branch (r1 - #xA1)
(r1 = r4)
(r1 = r5)
(r1 = r6)
(r1 = ,(charset-id 'chinese-cns11643-4))
(r1 = ,(charset-id 'chinese-cns11643-5))
(r1 = ,(charset-id 'chinese-cns11643-6))
(r1 = ,(charset-id 'chinese-cns11643-7)))
(r2 = ((((r2 - #x80) << 7) + r3) - #x80))
(write-multibyte-character r1 r2)
(repeat))))))
;; standard EUC
(if (r0 < #xA1)
;; invalid first byte
(write-repeat r0)
(read-if (r1 < #xA1)
;; invalid second byte
((write r0)
(write-repeat r1))
;; CNS 1, finally
((r1 = ((((r0 - #x80) << 7) + r1) - #x80))
(write-multibyte-character r4 r1)
(repeat)))))))))
"CCL program to decode EUC-TW encoding."
)
(define-ccl-program ccl-encode-euc-tw
`(2
;; we don't have enough registers to hold all charset-ids
((r2 = ,(charset-id 'ascii))
(r3 = ,(charset-id 'chinese-big5-1))
(r4 = ,(charset-id 'chinese-big5-2))
(r5 = ,(charset-id 'chinese-cns11643-1))
(r6 = ,(charset-id 'chinese-cns11643-2))
(loop
(read-multibyte-character r0 r1)
(if (r0 == r2)
(write-repeat r1)
(;; Big 5 encoded characters are first translated to CNS
(if (r0 == r3)
(translate-character big5-to-cns r0 r1)
(if (r0 == r4)
(translate-character big5-to-cns r0 r1)))
(if (r0 == r5)
(r0 = #xA1)
(if (r0 == r6)
(r0 = #xA2)
(if (r0 == ,(charset-id 'chinese-cns11643-3))
(r0 = #xA3)
(if (r0 == ,(charset-id 'chinese-cns11643-4))
(r0 = #xA4)
(if (r0 == ,(charset-id 'chinese-cns11643-5))
(r0 = #xA5)
(if (r0 == ,(charset-id 'chinese-cns11643-6))
(r0 = #xA6)
(if (r0 == ,(charset-id 'chinese-cns11643-7))
(r0 = #xA7)
;; not CNS. We use a dummy character which
;; can't occur in EUC-TW encoding to indicate
;; this.
(write-repeat #xFF))))))))))
(if (r0 != #xA1)
;; single shift and CNS plane
((write #x8E)
(write r0)))
(write ((r1 >> 7) + #x80))
(write ((r1 % #x80) + #x80))
(repeat))))
"CCL program to encode EUC-TW encoding."
)
(defun euc-tw-pre-write-conversion (beg end)
"Semi-dummy pre-write function effectively to autoload china-util."
;; Ensure translation table is loaded.
(require 'china-util)
;; Don't do this again.
(coding-system-put 'euc-tw 'pre-write-conversion nil)
nil)
(make-coding-system
'euc-tw 4 ?Z
"ISO 2022 based EUC encoding for Chinese CNS11643.
Big5 encoding is accepted for input also (which is then converted to CNS)."
'(ccl-decode-euc-tw . ccl-encode-euc-tw)
'((safe-charsets ascii
chinese-big5-1
chinese-big5-2
chinese-cns11643-1
chinese-cns11643-2
chinese-cns11643-3
chinese-cns11643-4
chinese-cns11643-5
chinese-cns11643-6
chinese-cns11643-7)
(valid-codes (0 . 255))
(pre-write-conversion . euc-tw-pre-write-conversion)))
(define-coding-system-alias 'euc-taiwan 'euc-tw)
(set-language-info-alist
"Chinese-CNS" '((charset chinese-cns11643-1 chinese-cns11643-2
chinese-cns11643-3 chinese-cns11643-4
chinese-cns11643-5 chinese-cns11643-6
chinese-cns11643-7)
(coding-system iso-2022-cn euc-tw)
(coding-priority iso-2022-cn euc-tw chinese-big5
chinese-iso-8bit)
(features china-util)
(input-method . "chinese-cns-quick")
(documentation . "\
Support for Chinese CNS character sets. Note that the EUC-TW coding system
accepts Big5 for input also (which is then converted to CNS)."))
'("Chinese"))
(set-language-info-alist
"Chinese-EUC-TW" '((charset chinese-cns11643-1 chinese-cns11643-2
chinese-cns11643-3 chinese-cns11643-4
chinese-cns11643-5 chinese-cns11643-6
chinese-cns11643-7 chinese-big5-1 chinese-big5-2)
(coding-system euc-tw iso-2022-cn)
(coding-priority euc-tw chinese-big5 iso-2022-cn
chinese-iso-8bit)
(features china-util)
(input-method . "chinese-cns-quick")
(documentation . "\
Support for Chinese, prefering the EUC-TW character set. Note that
the EUC-TW coding system accepts Big5 for input also (which is then
converted to CNS)."))
'("Chinese"))
(provide 'chinese)
;;; arch-tag: b82fcf7a-84f6-4e0b-b38c-1742dac0e09f
;;; chinese.el ends here
|
