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285 lines
9.3 KiB
EmacsLisp
285 lines
9.3 KiB
EmacsLisp
;;; thai-util.el --- utilities for Thai -*- lexical-binding: t; -*-
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;; Copyright (C) 2000-2022 Free Software Foundation, Inc.
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 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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;; Keywords: mule, multilingual, Thai, 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 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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(defvar thai-auto-composition-mode)
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;; Setting information of Thai characters.
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(defconst thai-category-table (make-category-table))
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(define-category ?c "Thai consonant" thai-category-table)
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(define-category ?v "Thai upper/lower vowel" thai-category-table)
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(define-category ?t "Thai tone mark" thai-category-table)
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(define-category ?u "Thai tone mark and upper sign" thai-category-table)
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(define-category ?I "THAI CHARACTER SARA I" thai-category-table)
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(define-category ?U "THAI CHARACTER THANTHAKHAT" thai-category-table)
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;; The general composing rules are as follows:
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;;
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;; T
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;; V U V U
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;; CV -> C, CU -> C, CVT -> C, Cv -> C, CvU -> C
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;; v v
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;;
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;; where C: consonant, V: vowel upper, v: vowel lower,
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;; T: tone mark, U: tone mark and upper sign.
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;; Special rule: The sign `์' can be put on the vowel `ิ'.
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(defvar thai-composition-pattern
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"\\cc\\(\\cu\\|\\cI\\cU\\|\\cv\\ct?\\)\\|\\cv\\ct\\|\\cI\\cU"
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"Regular expression matching a Thai composite sequence.")
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(let ((l '((?ก consonant) ; 0xA1
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(?ข consonant) ; 0xA2
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(?ฃ consonant) ; 0xA3
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(?ค consonant) ; 0xA4
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(?ฅ consonant) ; 0xA5
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(?ฆ consonant) ; 0xA6
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(?ง consonant) ; 0xA7
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(?จ consonant) ; 0xA8
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(?ฉ consonant) ; 0xA9
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(?ช consonant) ; 0xAA
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(?ซ consonant) ; 0xAB
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(?ฌ consonant) ; 0xAC
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(?ญ consonant) ; 0xAD
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(?ฎ consonant) ; 0xAE
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(?ฏ consonant) ; 0xAF
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(?ฐ consonant) ; 0xB0
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(?ฑ consonant) ; 0xB1
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(?ฒ consonant) ; 0xB2
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(?ณ consonant) ; 0xB3
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(?ด consonant) ; 0xB4
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(?ต consonant) ; 0xB5
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(?ถ consonant) ; 0xB6
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(?ท consonant) ; 0xB7
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(?ธ consonant) ; 0xB8
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(?น consonant) ; 0xB9
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(?บ consonant) ; 0xBA
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(?ป consonant) ; 0xBB
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(?ผ consonant) ; 0xBC
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(?ฝ consonant) ; 0xBD
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(?พ consonant) ; 0xBE
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(?ฟ consonant) ; 0xBF
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(?ภ consonant) ; 0xC0
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(?ม consonant) ; 0xC1
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(?ย consonant) ; 0xC2
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(?ร consonant) ; 0xC3
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(?ฤ vowel-base) ; 0xC4
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(?ล consonant) ; 0xC5
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(?ฦ vowel-base) ; 0xC6
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(?ว consonant) ; 0xC7
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(?ศ consonant) ; 0xC8
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(?ษ consonant) ; 0xC9
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(?ส consonant) ; 0xCA
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(?ห consonant) ; 0xCB
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(?ฬ consonant) ; 0xCC
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(?อ consonant) ; 0xCD
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(?ฮ consonant) ; 0xCE
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(?ฯ special) ; 0xCF
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(?ะ vowel-base) ; 0xD0
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(?ั vowel-upper) ; 0xD1
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(?า vowel-base) ; 0xD2
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(?ำ vowel-base) ; 0xD3
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(?ิ vowel-upper) ; 0xD4
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(?ี vowel-upper) ; 0xD5
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(?ึ vowel-upper) ; 0xD6
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(?ื vowel-upper) ; 0xD7
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(?ุ vowel-lower) ; 0xD8
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(?ู vowel-lower) ; 0xD9
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(?ฺ vowel-lower) ; 0xDA
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(? invalid) ; 0xDA
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(? invalid) ; 0xDC
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(? invalid) ; 0xDC
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(? invalid) ; 0xDC
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(?฿ special) ; 0xDF
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(?เ vowel-base) ; 0xE0
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(?แ vowel-base) ; 0xE1
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(?โ vowel-base) ; 0xE2
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(?ใ vowel-base) ; 0xE3
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(?ไ vowel-base) ; 0xE4
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(?ๅ vowel-base) ; 0xE5
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(?ๆ special) ; 0xE6
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(?็ sign-upper) ; 0xE7
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(?่ tone) ; 0xE8
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(?้ tone) ; 0xE9
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(?๊ tone) ; 0xEA
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(?๋ tone) ; 0xEB
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(?์ sign-upper) ; 0xEC
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(?ํ sign-upper) ; 0xED
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(?๎ sign-upper) ; 0xEE
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(?๏ special) ; 0xEF
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(?๐ special) ; 0xF0
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(?๑ special) ; 0xF1
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(?๒ special) ; 0xF2
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(?๓ special) ; 0xF3
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(?๔ special) ; 0xF4
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(?๕ special) ; 0xF5
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(?๖ special) ; 0xF6
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(?๗ special) ; 0xF7
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(?๘ special) ; 0xF8
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(?๙ special) ; 0xF9
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(?๚ special) ; 0xFA
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(?๛ special) ; 0xFB
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(? invalid) ; 0xFC
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(? invalid) ; 0xFD
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(? invalid) ; 0xFE
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))
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elm)
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(while l
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(setq elm (car l) l (cdr l))
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(let ((char (car elm))
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(ptype (nth 1 elm)))
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(put-char-code-property char 'phonetic-type ptype)
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(cond ((eq ptype 'consonant)
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(modify-category-entry char ?c thai-category-table))
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((memq ptype '(vowel-upper vowel-lower))
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(modify-category-entry char ?v thai-category-table)
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(if (= char ?ิ)
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;; Give category `I' to "SARA I".
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(modify-category-entry char ?I thai-category-table)))
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((eq ptype 'tone)
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(modify-category-entry char ?t thai-category-table)
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(modify-category-entry char ?u thai-category-table))
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((eq ptype 'sign-upper)
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(modify-category-entry char ?u thai-category-table)
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(if (= char ?์)
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;; Give category `U' to "THANTHAKHAT".
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(modify-category-entry char ?U thai-category-table)))))))
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(defun thai-compose-syllable (beg end &optional category-set string)
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(or category-set
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(setq category-set
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(char-category-set (if string (aref string beg) (char-after beg)))))
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(if (aref category-set ?c)
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;; Starting with a consonant. We do relative composition.
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(if string
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(compose-string string beg end)
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(compose-region beg end))
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;; Vowel tone sequence.
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(if string
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(compose-string string beg end (list (aref string beg) '(Bc . Bc)
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(aref string (1+ beg))))
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(compose-region beg end (list (char-after beg) '(Bc . Bc)
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(char-after (1+ beg))))))
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(- end beg))
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;;;###autoload
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(defun thai-compose-region (beg end)
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"Compose Thai characters in the region.
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When called from a program, expects two arguments,
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positions (integers or markers) specifying the region."
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(interactive "r")
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(let ((pos (point)))
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(save-restriction
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(narrow-to-region beg end)
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(goto-char (point-min))
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(with-category-table thai-category-table
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(while (re-search-forward thai-composition-pattern nil t)
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(setq beg (match-beginning 0) end (match-end 0))
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(if (and (> pos beg) (< pos end))
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(setq pos end))
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(thai-compose-syllable beg end
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(char-category-set (char-after beg))))))
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(goto-char pos)))
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;;;###autoload
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(defun thai-compose-string (string)
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"Compose Thai characters in STRING and return the resulting string."
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(with-category-table thai-category-table
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(let ((idx 0))
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(while (setq idx (string-match thai-composition-pattern string idx))
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(thai-compose-syllable idx (match-end 0) nil string)
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(setq idx (match-end 0)))))
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string)
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;;;###autoload
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(defun thai-compose-buffer ()
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"Compose Thai characters in the current buffer."
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(interactive)
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(thai-compose-region (point-min) (point-max)))
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;;;###autoload
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(defun thai-composition-function (gstring direction)
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(if (= (lgstring-char-len gstring) 1)
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(compose-gstring-for-graphic gstring direction)
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(or (font-shape-gstring gstring direction)
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(let ((glyph-len (lgstring-glyph-len gstring))
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(last-char (lgstring-char gstring
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(1- (lgstring-char-len gstring))))
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(i 0)) ;; glyph
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(while (and (< i glyph-len)
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;; (setq glyph
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(lgstring-glyph gstring i)) ;; )
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(setq i (1+ i)))
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(if (= last-char ?ำ)
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(setq i (1- i)))
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(compose-glyph-string-relative gstring 0 i 0.1)))))
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;; Thai-word-mode requires functions in the feature `thai-word'.
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(require 'thai-word)
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(defvar-keymap thai-word-mode-map
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:doc "Keymap for `thai-word-mode'."
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"<remap> <forward-word>" #'thai-forward-word
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"<remap> <backward-word>" #'thai-backward-word
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"<remap> <kill-word>" #'thai-kill-word
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"<remap> <backward-kill-word>" #'thai-backward-kill-word
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"<remap> <transpose-words>" #'thai-transpose-words)
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(define-minor-mode thai-word-mode
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"Minor mode to make word-oriented commands aware of Thai words.
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The commands affected are \\[forward-word], \\[backward-word],
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\\[kill-word], \\[backward-kill-word], \\[transpose-words], and
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\\[fill-paragraph]."
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:global t :group 'mule
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(cond (thai-word-mode
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;; This enables linebreak between Thai characters.
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(modify-category-entry (make-char 'thai-tis620) ?|)
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;; This enables linebreak at a Thai word boundary.
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(put-charset-property 'thai-tis620 'fill-find-break-point-function
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'thai-fill-find-break-point))
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(t
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(modify-category-entry (make-char 'thai-tis620) ?| nil t)
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(put-charset-property 'thai-tis620 'fill-find-break-point-function
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nil))))
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;; Function to call on entering the Thai language environment.
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(defun setup-thai-language-environment-internal ()
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(thai-word-mode 1))
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;; Function to call on exiting the Thai language environment.
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(defun exit-thai-language-environment-internal ()
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(thai-word-mode -1))
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;;
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(provide 'thai-util)
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;;; thai-util.el ends here
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