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[Emacs-diffs] Changes to lisp/language/tv-util.el
From: |
Miles Bader |
Subject: |
[Emacs-diffs] Changes to lisp/language/tv-util.el |
Date: |
Fri, 01 Feb 2008 16:04:27 +0000 |
CVSROOT: /cvsroot/emacs
Module name: emacs
Changes by: Miles Bader <miles> 08/02/01 16:01:31
Index: lisp/language/tv-util.el
===================================================================
RCS file: lisp/language/tv-util.el
diff -N lisp/language/tv-util.el
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ lisp/language/tv-util.el 1 Feb 2008 16:01:02 -0000 1.2
@@ -0,0 +1,145 @@
+;;; tv-util.el --- support for Tai Viet -*- coding:
utf-8 -*-
+
+;; Copyright (C) 2007
+;; 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 2, 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; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Code
+
+;; Regexp matching with a sequence of Tai Viet characters.
+(defconst tai-viet-re
+ (format "[\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 . "êªêªêªêªêªêªêªêªêªêª¡êª¤êª¨")
+ (left-overhang . "ê«")
+ (combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
+ (combining-tone . "꪿ê«")
+ (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)
+
+;; arch-tag: a45ac3fc-07d0-44d5-8841-2ebea7e11f5b
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