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86 lines
2.8 KiB
EmacsLisp
86 lines
2.8 KiB
EmacsLisp
;;; lao.el --- support for Lao -*- coding: utf-8 -*-
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;; Copyright (C) 2001-2020 Free Software Foundation, Inc.
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;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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;; 2007, 2008, 2009, 2010, 2011
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Copyright (C) 2003
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H13PRO009
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;; Keywords: multilingual, Lao
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(define-coding-system 'lao
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"8-bit encoding for ASCII (MSB=0) and LAO (MSB=1)."
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:coding-type 'charset
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:mnemonic ?L
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:charset-list '(lao))
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(set-language-info-alist
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"Lao" '((charset lao)
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(coding-system lao)
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(coding-priority lao)
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(input-method . "lao")
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(unibyte-display . lao)
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(features lao-util)
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(documentation . t)))
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(let ((consonant "ກ-ຮໜໝ")
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(tone "່-໌")
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(vowel-upper-lower "ັິ-ົໍ")
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(semivowel-lower "ຼ")
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(fallback-rule [nil 0 compose-gstring-for-graphic]))
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;; target characters regexp
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;; ----------------- ------
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(dolist (l `((,vowel-upper-lower . "[c].[t]?")
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(,tone . "[c].")
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(,semivowel-lower . "[c].[v][t]?")
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(,semivowel-lower . "[c].[t]")))
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(let* ((chars (car l))
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(len (length chars))
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;; Replace `c', `t', `v' to consonant, tone, and vowel.
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(regexp (mapconcat #'(lambda (c)
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(cond ((= c ?c) consonant)
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((= c ?t) tone)
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((= c ?v) vowel-upper-lower)
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(t (string c))))
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(cdr l) ""))
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;; Element of composition-function-table.
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(elt (list (vector regexp 1 'lao-composition-function)
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fallback-rule))
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ch)
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(dotimes (i len)
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(setq ch (aref chars i))
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(if (and (> i 1) (= (aref chars (1- i)) ?-))
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;; End of character range.
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(set-char-table-range composition-function-table
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(cons (aref chars (- i 2)) ch) elt)
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(if (or (= (1+ i) len)
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(and (/= ch ?-) (/= (aref chars (1+ i)) ?-)))
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;; A character not forming a range.
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(set-char-table-range composition-function-table ch elt)))))))
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(provide 'lao)
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;;; lao.el ends here
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