code.delx.au - gnu-emacs/blob - lisp/language/indian.el

   1 ;;; indian.el --- Indian languages support -*- coding: iso-2022-7bit; -*-
   2
   3 ;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
   4
   5 ;; Maintainer:  KAWABATA, Taichi <kawabata@m17n.org>
   6 ;; Keywords:    multilingual, i18n, Indian
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; This file defines in-is13194 coding system and relationship between
  28 ;; indian-glyph character-set and various CDAC fonts.
  29
  30 ;;; Code:
  31
  32 (make-coding-system
  33  'in-is13194 2 ?D
  34  "8-bit encoding for ASCII (MSB=0) and IS13194-Devanagari (MSB=1)."
  35  '(ascii indian-is13194 nil nil
  36    nil ascii-eol)
  37  `((safe-chars . ,(let ((table (make-char-table 'safe-chars nil)))
  38                     (set-char-table-range table 'indian-is13194 t)
  39                     (dotimes (i 127)
  40                       (aset table i t)
  41                       (aset table (decode-char 'ucs (+ #x900 i)) t))
  42                     table))
  43    (post-read-conversion . in-is13194-post-read-conversion)
  44    (pre-write-conversion . in-is13194-pre-write-conversion)))
  45
  46 (define-coding-system-alias 'devanagari 'in-is13194)
  47
  48 (defvar indian-script-table
  49   '[
  50     devanagari
  51     sanskrit
  52     bengali
  53     tamil
  54     telugu
  55     assamese
  56     oriya
  57     kannada
  58     malayalam
  59     gujarati
  60     punjabi
  61     ]
  62   "Vector of Indian script names.")
  63
  64 (let ((len (length indian-script-table))
  65       (i 0))
  66   (while (< i len)
  67     (put (aref indian-script-table i) 'indian-glyph-code-offset (* 256 i))
  68     (setq i (1+ i))))
  69
  70 (defvar indian-default-script 'devanagari
  71   "Default script for Indian languages.
  72 Each Indian language environment sets this value
  73 to one of `indian-script-table' (which see).
  74 The default value is `devanagari'.")
  75
  76 (define-ccl-program ccl-encode-indian-glyph-font
  77   `(0
  78     ;; Shorten (r1 = (((((r1 - 32) * 96) + r2) - 32) % 256))
  79     (r1 = ((((r1 * 96) + r2) - ,(+ (* 32 96) 32)) % 256))))
  80
  81 (setq font-ccl-encoder-alist
  82       (cons (cons "-CDAC" 'ccl-encode-indian-glyph-font)
  83             font-ccl-encoder-alist))
  84
  85 (provide 'indian)
  86
  87 ;;; indian.el ends here