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;;; lao.el --- support for Lao -*- coding: utf-8; lexical-binding: t; -*-
;; Copyright (C) 2001-2025 Free Software Foundation, Inc.
;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
;; 2007, 2008, 2009, 2010, 2011
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H14PRO021
;; Copyright (C) 2003
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H13PRO009
;; Keywords: multilingual, Lao
;; 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(define-coding-system 'lao
"8-bit encoding for ASCII (MSB=0) and LAO (MSB=1)."
:coding-type 'charset
:mnemonic ?L
:charset-list '(lao))
(set-language-info-alist
"Lao" '((charset lao)
(coding-system lao)
(coding-priority lao)
(input-method . "lao")
(unibyte-display . lao)
(features lao-util)
(documentation . t)))
(let ((consonant "ກ-ຮໜໝ")
(tone "່-໌")
(vowel-upper-lower "ັິ-ົໍ")
(semivowel-lower "ຼ")
(fallback-rule [nil 0 compose-gstring-for-graphic]))
;; target characters regexp
;; ----------------- ------
(dolist (l `((,vowel-upper-lower . "[c].[t]?")
(,tone . "[c].")
(,semivowel-lower . "[c].[v][t]?")
(,semivowel-lower . "[c].[t]")))
(let* ((chars (car l))
(len (length chars))
;; Replace `c', `t', `v' to consonant, tone, and vowel.
(regexp (mapconcat (lambda (c)
(cond ((eq c ?c) consonant)
((eq c ?t) tone)
((eq c ?v) vowel-upper-lower)
(t (string c))))
(cdr l) ""))
;; Element of composition-function-table.
(elt (list (vector regexp 1 #'lao-composition-function)
fallback-rule))
ch)
(dotimes (i len)
(setq ch (aref chars i))
(if (and (> i 1) (= (aref chars (1- i)) ?-))
;; End of character range.
(set-char-table-range composition-function-table
(cons (aref chars (- i 2)) ch) elt)
(if (or (= (1+ i) len)
(and (/= ch ?-) (/= (aref chars (1+ i)) ?-)))
;; A character not forming a range.
(set-char-table-range composition-function-table ch elt)))))))
(provide 'lao)
;;; lao.el ends here
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