lisp/language/lao.el

   1 ;;; lao.el --- support for Lao -*- coding: utf-8 -*-
   2
   3 ;; Copyright (C) 2001-2013 Free Software Foundation, Inc.
   4 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   5 ;;   2007, 2008, 2009, 2010, 2011
   6 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   7 ;;   Registration Number H14PRO021
   8 ;; Copyright (C) 2003
   9 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
  10 ;;   Registration Number H13PRO009
  11
  12 ;; Keywords: multilingual, Lao
  13
  14 ;; This file is part of GNU Emacs.
  15
  16 ;; GNU Emacs is free software: you can redistribute it and/or modify
  17 ;; it under the terms of the GNU General Public License as published by
  18 ;; the Free Software Foundation, either version 3 of the License, or
  19 ;; (at your option) any later version.
  20
  21 ;; GNU Emacs is distributed in the hope that it will be useful,
  22 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 ;; GNU General Public License for more details.
  25
  26 ;; You should have received a copy of the GNU General Public License
  27 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  28
  29 ;;; Commentary:
  30
  31 ;;; Code:
  32
  33 (define-coding-system 'lao
  34   "8-bit encoding for ASCII (MSB=0) and LAO (MSB=1)."
  35   :coding-type 'charset
  36   :mnemonic ?L
  37   :charset-list '(lao))
  38
  39 (set-language-info-alist
  40  "Lao" '((charset lao)
  41          (coding-system lao)
  42          (coding-priority lao)
  43          (input-method . "lao")
  44          (unibyte-display . lao)
  45          (features lao-util)
  46          (documentation . t)))
  47
  48 (let ((consonant "ກ-ຮໜໝ")
  49       (tone "່-໌")
  50       (vowel-upper-lower "ັິ-ົໍ")
  51       (semivowel-lower "ຼ")
  52       (fallback-rule [nil 0 compose-gstring-for-graphic]))
  53   ;;            target characters    regexp
  54   ;;            -----------------    ------
  55   (dolist (l `((,vowel-upper-lower . "[c].[t]?")
  56                (,tone .              "[c].")
  57                (,semivowel-lower .   "[c].[v][t]?")
  58                (,semivowel-lower .   "[c].[t]")))
  59     (let* ((chars (car l))
  60            (len (length chars))
  61            ;; Replace `c', `t', `v' to consonant, tone, and vowel.
  62            (regexp (mapconcat #'(lambda (c)
  63                                   (cond ((= c ?c) consonant)
  64                                         ((= c ?t) tone)
  65                                         ((= c ?v) vowel-upper-lower)
  66                                         (t (string c))))
  67                               (cdr l) ""))
  68            ;; Element of composition-function-table.
  69            (elt (list (vector regexp 1 'lao-composition-function)
  70                       fallback-rule))
  71            ch)
  72       (dotimes (i len)
  73         (setq ch (aref chars i))
  74         (if (and (> i 1) (= (aref chars (1- i)) ?-))
  75             ;; End of character range.
  76             (set-char-table-range composition-function-table
  77                                   (cons (aref chars (- i 2)) ch) elt)
  78           (if (or (= (1+ i) len)
  79                   (and (/= ch ?-) (/= (aref chars (1+ i)) ?-)))
  80               ;; A character not forming a range.
  81               (set-char-table-range composition-function-table ch elt)))))))
  82
  83 (provide 'lao)
  84
  85 ;;; lao.el ends here