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lisp/language/tai-viet.el
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lisp/language/tai-viet.el
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;;; tai-viet.el --- support for Tai Viet -*- coding: utf-8; no-byte-compile: t -*-
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;; Copyright (C) 2007
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H13PRO009
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;; Copyright (C) 2007 Free Software Foundation, Inc.
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;; Keywords: multilingual, Tai Viet, i18n
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; Tai Viet is being included in the Unicode at the range U+AA80..U+AADF.
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;;; Code:
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(set-char-table-range composition-function-table
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'(#xAA80 . #xAADF)
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'tai-viet-composition-function)
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(set-language-info-alist
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"TaiViet" '((charset unicode)
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(coding-system utf-8)
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(coding-priority utf-8)
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(input-method . "tai-sonla")
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(sample-text
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"TaiViet (ꪁꪫꪱꪣ ꪽꪕ)\t\tꪅꪰꪙ ꪨꪮ ꪁꪫꪱ / ꪅꪾ ꪨ<> ꪁꪫꪱ")
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(documentation . "\
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TaiViet refers to the Tai language used by Tai people in
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Vietnam, and also refers to the script used for this language.
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Both the script and language have the same origin as that of Thai
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language/script used in Thailand, but now they differ from each
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other in a significant way (especially the scripts are).
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The language name is spelled as \"ꪁꪫꪱꪣ ꪽꪕ\", and the script name is
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spelled as \"ꪎ<EFBFBD> ꪽꪕ\" in the modern form, \"ꪎꪴ ꪽꪕ\" in the traditional
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from.
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As the proposal for TaiViet script to the Unicode is still on
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the progress, we use the Private Use Area for TaiViet
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characters (U+F000..U+F07E). A TaiViet font encoded accordingly
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is available at this web page:
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http://www.m17n.org/TaiViet/
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")))
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(provide 'tai-viet)
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;; Local Variables:
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;; coding: utf-8
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;; End:
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145
lisp/language/tv-util.el
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lisp/language/tv-util.el
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;;; tv-util.el --- support for Tai Viet -*- coding: utf-8 -*-
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;; Copyright (C) 2007
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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, Tai Viet, i18n
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Code
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;; Regexp matching with a sequence of Tai Viet characters.
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(defconst tai-viet-re
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(format "[\xaa80-\xaac2\xaadb-\xaadf]+"))
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;; Char-table of information about glyph type of Tai Viet characters.
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(defconst tai-viet-glyph-info
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(let ((table (make-char-table nil))
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(specials '((right-overhang . "ꪊꪋꪌꪍꪏꪓꪖꪜꪞꪡꪤꪨ")
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(left-overhang . "ꫂ")
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(combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
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(combining-tone . "꪿꫁"))))
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;; Set all TaiViet characters to `t'.
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(set-char-table-range table (cons #xaa80 #xaac2) t)
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(set-char-table-range table (cons #xaadb #xaadf) t)
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;; Overwrite it for special characters.
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(dolist (elt specials)
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(let ((category (car elt))
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(chars (cdr elt)))
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(dotimes (i (length chars))
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(aset table (aref chars i) category))))
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table))
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(defun tai-viet-compose-string (from to string)
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"Compose Tai Viet characters in STRING between indices FROM and TO."
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(let* ((ch (aref string from))
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(info (aref tai-viet-glyph-info ch))
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prev-info)
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(if (eq info 'non-spacing)
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(compose-string string from (1+ from) (string ch ?\t)))
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(setq from (1+ from) prev-info info)
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(while (and (< from to)
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(tai-viet-char-p (setq ch (aref string from))))
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(setq info (aref tai-viet-glyph-info ch))
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(if (and (eq info 'non-spacing)
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(eq prev-info 'non-spacing))
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(compose-string from (1+ from) (string ?\t ch)))
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(setq from (1+ from) prev-info info))
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(if (eq info 'right-overhang)
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(compose-string string (1- from) from (string ch ?\t)))
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from))
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(defun tai-viet-compose-region (from to)
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"Compose Tai Viet characters in the region between FROM and TO."
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(decompose-region from to)
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(let ((normal-rule '(Br . Bl))
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(tone-rule '(tr . bl))
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(prev-viet nil)
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ch info pos components overhang)
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(while (< from to)
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(or ch
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch)))
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(setq from (1+ from))
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(if (not info)
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(setq prev-viet nil
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ch nil)
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(if (memq info '(combining-vowel combining-tone))
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(progn
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;; Display this as a spacing glyph.
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(compose-region (1- from) from (string ?\t ch))
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(setq prev-viet t
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ch nil))
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(setq pos (1- from)
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components ch
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overhang (if (eq info 'right-overhang)
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'right-overhang
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(if (and (not prev-viet) (eq info 'left-overhang))
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'left-overhang))
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prev-viet t
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ch nil)
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(if (and (< from to)
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch)))
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(if (memq info '(combining-vowel combining-tone))
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(progn
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(setq components
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(list components normal-rule ch)
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from (1+ from)
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ch nil)
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(if (and (< from to)
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(setq ch (char-after from)
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info (aref tai-viet-glyph-info ch))
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(eq info 'combining-tone))
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(setq components (nconc components
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(list tone-rule ch))
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from (1+ from)))
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(if (eq overhang 'left-overhang)
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(setq components (cons ?\t
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(cons normal-rule components)))
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(if (and (eq overhang 'right-overhang)
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(>= from to))
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(setq components (nconc components
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(list normal-rule ?\t)))))
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(compose-region pos from components))
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(if (eq overhang 'left-overhang)
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(compose-region pos from (string ?\t components))))
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(if (eq overhang 'left-overhang)
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(compose-region pos from (string ?\t components))
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(if (and (eq overhang 'right-overhang) (>= from to))
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(compose-region pos from (string components ?\t))))))))
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from))
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;;;###autoload
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(defun tai-viet-composition-function (pos &optional string)
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(let (to)
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(if string
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(progn
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(if (string-match tai-viet-re string pos)
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(tai-viet-compose-string pos (match-end 0) string)
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(1+ pos)))
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(goto-char pos)
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(if (looking-at tai-viet-re)
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(tai-viet-compose-region pos (match-end 0))
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(1+ pos)))))
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;;
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(provide 'tai-viet-util)
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