mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-21 10:24:55 +00:00
142 lines
4.7 KiB
EmacsLisp
142 lines
4.7 KiB
EmacsLisp
;;; tv-util.el --- support for Tai Viet -*- coding: utf-8 -*-
|
|
|
|
;; Copyright (C) 2007, 2008, 2009, 2010, 2011
|
|
;; National Institute of Advanced Industrial Science and Technology (AIST)
|
|
;; Registration Number H13PRO009
|
|
|
|
;; Keywords: multilingual, Tai Viet, i18n
|
|
|
|
;; 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 <http://www.gnu.org/licenses/>.
|
|
|
|
;;; Code
|
|
|
|
;; Regexp matching with a sequence of Tai Viet characters.
|
|
(defconst tai-viet-re "[\xaa80-\xaac2\xaadb-\xaadf]+")
|
|
|
|
;; Char-table of information about glyph type of Tai Viet characters.
|
|
(defconst tai-viet-glyph-info
|
|
(let ((table (make-char-table nil))
|
|
(specials '((right-overhang . "ꪊꪋꪌꪍꪏꪓꪖꪜꪞꪡꪤꪨ")
|
|
(left-overhang . "ꫂ")
|
|
(combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
|
|
(combining-tone . "꪿꫁")
|
|
(misc . "-"))))
|
|
;; Set all TaiViet characters to `t'.
|
|
(set-char-table-range table (cons #xaa80 #xaac2) t)
|
|
(set-char-table-range table (cons #xaadb #xaadf) t)
|
|
;; Overwrite it for special characters.
|
|
(dolist (elt specials)
|
|
(let ((category (car elt))
|
|
(chars (cdr elt)))
|
|
(dotimes (i (length chars))
|
|
(aset table (aref chars i) category))))
|
|
table))
|
|
|
|
(defun tai-viet-compose-string (from to string)
|
|
"Compose Tai Viet characters in STRING between indices FROM and TO."
|
|
(let* ((ch (aref string from))
|
|
(info (aref tai-viet-glyph-info ch))
|
|
prev-info)
|
|
(if (eq info 'non-spacing)
|
|
(compose-string string from (1+ from) (string ch ?\t)))
|
|
(setq from (1+ from) prev-info info)
|
|
(while (and (< from to)
|
|
(>= #xaa80 (setq ch (aref string from)))
|
|
(<= #xaaDF ch))
|
|
(setq info (aref tai-viet-glyph-info ch))
|
|
(if (and (eq info 'non-spacing)
|
|
(eq prev-info 'non-spacing))
|
|
(compose-string from (1+ from) (string ?\t ch)))
|
|
(setq from (1+ from) prev-info info))
|
|
(if (eq info 'right-overhang)
|
|
(compose-string string (1- from) from (string ch ?\t)))
|
|
from))
|
|
|
|
(defun tai-viet-compose-region (from to)
|
|
"Compose Tai Viet characters in the region between FROM and TO."
|
|
(decompose-region from to)
|
|
(let ((normal-rule '(Br . Bl))
|
|
(tone-rule '(tr . bl))
|
|
(prev-viet nil)
|
|
ch info pos components overhang)
|
|
(while (< from to)
|
|
(or ch
|
|
(setq ch (char-after from)
|
|
info (aref tai-viet-glyph-info ch)))
|
|
(setq from (1+ from))
|
|
(if (not info)
|
|
(setq prev-viet nil
|
|
ch nil)
|
|
(if (memq info '(combining-vowel combining-tone))
|
|
(progn
|
|
;; Display this as a spacing glyph.
|
|
(compose-region (1- from) from (string ?\t ch))
|
|
(setq prev-viet t
|
|
ch nil))
|
|
(setq pos (1- from)
|
|
components ch
|
|
overhang (if (eq info 'right-overhang)
|
|
'right-overhang
|
|
(if (and (not prev-viet) (eq info 'left-overhang))
|
|
'left-overhang))
|
|
prev-viet t
|
|
ch nil)
|
|
(if (and (< from to)
|
|
(setq ch (char-after from)
|
|
info (aref tai-viet-glyph-info ch)))
|
|
(if (memq info '(combining-vowel combining-tone))
|
|
(progn
|
|
(setq components
|
|
(list components normal-rule ch)
|
|
from (1+ from)
|
|
ch nil)
|
|
(if (and (< from to)
|
|
(setq ch (char-after from)
|
|
info (aref tai-viet-glyph-info ch))
|
|
(eq info 'combining-tone))
|
|
(setq components (nconc components
|
|
(list tone-rule ch))
|
|
from (1+ from)))
|
|
(if (eq overhang 'left-overhang)
|
|
(setq components (cons ?\t
|
|
(cons normal-rule components)))
|
|
(if (and (eq overhang 'right-overhang)
|
|
(>= from to))
|
|
(setq components (nconc components
|
|
(list normal-rule ?\t)))))
|
|
(compose-region pos from components))
|
|
(if (eq overhang 'left-overhang)
|
|
(compose-region pos from (string ?\t components))))
|
|
(if (eq overhang 'left-overhang)
|
|
(compose-region pos from (string ?\t components))
|
|
(if (and (eq overhang 'right-overhang) (>= from to))
|
|
(compose-region pos from (string components ?\t))))))))
|
|
from))
|
|
|
|
|
|
;;;###autoload
|
|
(defun tai-viet-composition-function (from to font-object string)
|
|
(if string
|
|
(if (string-match tai-viet-re string from)
|
|
(tai-viet-compose-string from (match-end 0) string))
|
|
(goto-char from)
|
|
(if (looking-at tai-viet-re)
|
|
(tai-viet-compose-region from (match-end 0)))))
|
|
|
|
;;
|
|
(provide 'tai-viet-util)
|
|
|