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

   1 ;;; lao.el --- support for Lao -*- coding: utf-8; no-byte-compile: t -*-
   2
   3 ;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   6 ;;   2007, 2008, 2009, 2010, 2011
   7 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   8 ;;   Registration Number H14PRO021
   9 ;; Copyright (C) 2003
  10 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
  11 ;;   Registration Number H13PRO009
  12
  13 ;; Keywords: multilingual, Lao
  14
  15 ;; This file is part of GNU Emacs.
  16
  17 ;; GNU Emacs is free software: you can redistribute it and/or modify
  18 ;; it under the terms of the GNU General Public License as published by
  19 ;; the Free Software Foundation, either version 3 of the License, or
  20 ;; (at your option) any later version.
  21
  22 ;; GNU Emacs is distributed in the hope that it will be useful,
  23 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 ;; GNU General Public License for more details.
  26
  27 ;; You should have received a copy of the GNU General Public License
  28 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  29
  30 ;;; Commentary:
  31
  32 ;;; Code:
  33
  34 (define-coding-system 'lao
  35   "8-bit encoding for ASCII (MSB=0) and LAO (MSB=1)."
  36   :coding-type 'charset
  37   :mnemonic ?L
  38   :charset-list '(lao))
  39
  40 (set-language-info-alist
  41  "Lao" '((charset lao)
  42          (coding-system lao)
  43          (coding-priority lao)
  44          (input-method . "lao")
  45          (unibyte-display . lao)
  46          (features lao-util)
  47          (documentation . t)))
  48
  49 (let ((consonant "ກ-ຮໜໝ")
  50       (tone "່-໌")
  51       (vowel-upper-lower "ັິ-ົໍ")
  52       (semivowel-lower "ຼ")
  53       (fallback-rule [nil 0 compose-gstring-for-graphic]))
  54   ;;            target characters    regexp
  55   ;;            -----------------    ------
  56   (dolist (l `((,vowel-upper-lower . "[c].[t]?")
  57                (,tone .              "[c].")
  58                (,semivowel-lower .   "[c].[v][t]?")
  59                (,semivowel-lower .   "[c].[t]")))
  60     (let* ((chars (car l))
  61            (len (length chars))
  62            ;; Replace `c', `t', `v' to consonant, tone, and vowel.
  63            (regexp (mapconcat #'(lambda (c)
  64                                   (cond ((= c ?c) consonant)
  65                                         ((= c ?t) tone)
  66                                         ((= c ?v) vowel-upper-lower)
  67                                         (t (string c))))
  68                               (cdr l) ""))
  69            ;; Element of composition-function-table.
  70            (elt (list (vector regexp 1 'lao-composition-function)
  71                       fallback-rule))
  72            ch)
  73       (dotimes (i len)
  74         (setq ch (aref chars i))
  75         (if (and (> i 1) (= (aref chars (1- i)) ?-))
  76             ;; End of character range.
  77             (set-char-table-range composition-function-table
  78                                   (cons (aref chars (- i 2)) ch) elt)
  79           (if (or (= (1+ i) len)
  80                   (and (/= ch ?-) (/= (aref chars (1+ i)) ?-)))
  81               ;; A character not forming a range.
  82               (set-char-table-range composition-function-table ch elt)))))))
  83
  84 (provide 'lao)
  85
  86 ;; arch-tag: ba540fd9-6352-4449-a9cd-669afd21fa57
  87 ;;; lao.el ends here