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434 lines
15 KiB
EmacsLisp
434 lines
15 KiB
EmacsLisp
;;; tibet-util.el --- utilities for Tibetan -*- coding: iso-2022-7bit; -*-
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;; Copyright (C) 1997, 2002 Free Software Foundation, Inc.
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;; Copyright (C) 1995, 1997, 1998, 2000
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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: multilingual, Tibetan
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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., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;; Author: Toru TOMABECHI, <Toru.Tomabechi@orient.unil.ch>
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;; Created: Feb. 17. 1997
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;;; History:
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;; 1997.03.13 Modification in treatment of text properties;
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;; Support for some special signs and punctuations.
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;; 1999.10.25 Modification for a new composition way by K.Handa.
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;;; Commentary:
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;;; Code:
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(defconst tibetan-obsolete-glyphs
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`(("$(7!=(B" . "$(8!=(B") ; 2 col <-> 1 col
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("$(7!?(B" . "$(8!?(B")
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("$(7!@(B" . "$(8!@(B")
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("$(7!A(B" . "$(8!A(B")
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("$(7"`(B" . "$(8"`(B")
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("$(7!;(B" . "$(8!;(B")
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("$(7!D(B" . "$(8!D(B")
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;; Yes these are dirty. But ...
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("$(7!>(B $(7!>(B" . ,(compose-string "$(7!>(B $(7!>(B" 0 3 [?$(7!>(B (Br . Bl) ? (Br . Bl) ?$(7!>(B]))
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("$(7!4!5!5(B" . ,(compose-string
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"$(7#R#S#S#S(B" 0 4
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[?$(7#R(B (Br . Bl) ?$(7#S(B (Br . Bl) ?$(7#S(B (Br . Bl) ?$(7#S(B]))
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("$(7!4!5(B" . ,(compose-string "$(7#R#S#S(B" 0 3 [?$(7#R(B (Br . Bl) ?$(7#S(B (Br . Bl) ?$(7#S(B]))
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("$(7!6(B" . ,(compose-string "$(7#R#S!I(B" 0 3 [?$(7#R(B (Br . Bl) ?$(7#S(B (br . tr) ?$(7!I(B]))
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("$(7!4(B" . ,(compose-string "$(7#R#S(B" 0 2 [?$(7#R(B (Br . Bl) ?$(7#S(B]))))
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;;;###autoload
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(defun tibetan-char-p (ch)
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"Check if char CH is Tibetan character.
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Returns non-nil if CH is Tibetan. Otherwise, returns nil."
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(memq (char-charset ch) '(tibetan tibetan-1-column)))
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;;; Functions for Tibetan <-> Tibetan-transcription.
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;;;###autoload
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(defun tibetan-tibetan-to-transcription (str)
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"Transcribe Tibetan string STR and return the corresponding Roman string."
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(let (;; Accumulate transcriptions here in reverse order.
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(trans nil)
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(len (length str))
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(i 0)
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ch this-trans)
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(while (< i len)
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(let ((idx (string-match tibetan-precomposition-rule-regexp str i)))
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(if (eq idx i)
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;; Ith character and the followings matches precomposable
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;; Tibetan sequence.
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(setq i (match-end 0)
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this-trans
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(car (rassoc
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(cdr (assoc (match-string 0 str)
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tibetan-precomposition-rule-alist))
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tibetan-precomposed-transcription-alist)))
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(setq ch (substring str i (1+ i))
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i (1+ i)
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this-trans
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(car (or (rassoc ch tibetan-consonant-transcription-alist)
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(rassoc ch tibetan-vowel-transcription-alist)
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(rassoc ch tibetan-subjoined-transcription-alist)))))
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(setq trans (cons this-trans trans))))
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(apply 'concat (nreverse trans))))
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;;;###autoload
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(defun tibetan-transcription-to-tibetan (str)
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"Convert Tibetan Roman string STR to Tibetan character string.
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The returned string has no composition information."
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(let (;; Case is significant.
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(case-fold-search nil)
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(idx 0)
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;; Accumulate Tibetan strings here in reverse order.
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(t-str-list nil)
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i subtrans)
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(while (setq i (string-match tibetan-regexp str idx))
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(if (< idx i)
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;; STR contains a pattern that doesn't match Tibetan
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;; transcription. Include the pattern as is.
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(setq t-str-list (cons (substring str idx i) t-str-list)))
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(setq subtrans (match-string 0 str)
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idx (match-end 0))
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(let ((t-char (cdr (assoc subtrans
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tibetan-precomposed-transcription-alist))))
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(if t-char
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;; SUBTRANS corresponds to a transcription for
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;; precomposable Tibetan sequence.
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(setq t-char (car (rassoc t-char
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tibetan-precomposition-rule-alist)))
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(setq t-char
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(cdr
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(or (assoc subtrans tibetan-consonant-transcription-alist)
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(assoc subtrans tibetan-vowel-transcription-alist)
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(assoc subtrans tibetan-modifier-transcription-alist)
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(assoc subtrans tibetan-subjoined-transcription-alist)))))
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(setq t-str-list (cons t-char t-str-list))))
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(if (< idx (length str))
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(setq t-str-list (cons (substring str idx) t-str-list)))
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(apply 'concat (nreverse t-str-list))))
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;;;
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;;; Functions for composing/decomposing Tibetan sequence.
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;;;
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;;; A Tibetan syllable is typically structured as follows:
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;;;
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;;; [Prefix] C [C+] V [M] [Suffix [Post suffix]]
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;;;
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;;; where C's are all vertically stacked, V appears below or above
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;;; consonant cluster and M is always put above the C[C+]V combination.
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;;; (Sanskrit visarga, though it is a vowel modifier, is considered
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;;; to be a punctuation.)
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;;;
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;;; Here are examples of the words "bsgrubs" and "hfauM"
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;;;
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;;; 4$(7"70"714%qx!"U0"G###C"U14"70"714"G0"G1(B 4$(7"Hx!"Rx!"Ur'"_0"H"R"U"_1(B
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;;;
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;;; M
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;;; b s b s h
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;;; g fa
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;;; r u
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;;; u
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;;;
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;;; Consonants `'' ($(7"A(B), `w' ($(7">(B), `y' ($(7"B(B), `r' ($(7"C(B) take special
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;;; forms when they are used as subjoined consonant. Consonant `r'
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;;; takes another special form when used as superjoined in such a case
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;;; as "rka", while it does not change its form when conjoined with
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;;; subjoined `'', `w' or `y' as in "rwa", "rya".
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;; Append a proper composition rule and glyph to COMPONENTS to compose
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;; CHAR with a composition that has COMPONENTS.
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(defun tibetan-add-components (components char)
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(let ((last (last components))
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(stack-upper '(tc . bc))
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(stack-under '(bc . tc))
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rule comp-vowel tmp)
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;; Special treatment for 'a chung.
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;; If 'a follows a consonant, turn it into the subjoined form.
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;; * Disabled by Tomabechi 2000/06/09 *
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;; Because in Unicode, $(7"A(B may follow directly a consonant without
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;; any intervening vowel, as in 4$(7"90"914""0"""Q14"A0"A1!;(B=4$(7"90"91(B 4$(7""0""1(B 4$(7"A0"A1(B not 4$(7"90"91(B 4$(7""0""1(B $(7"Q(B 4$(7"A0"A1(B
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;;(if (and (= char ?$(7"A(B)
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;; (aref (char-category-set (car last)) ?0))
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;; (setq char ?$(7"R(B)) ;; modified for new font by Tomabechi 1999/12/10
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;; Composite vowel signs are decomposed before being added
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;; Added by Tomabechi 2000/06/08
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(if (memq char '(?$(7"T(B ?$(7"V(B ?$(7"W(B ?$(7"X(B ?$(7"Y(B ?$(7"Z(B ?$(7"b(B))
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(setq comp-vowel
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(copy-sequence
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(cddr (assoc (char-to-string char)
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tibetan-composite-vowel-alist)))
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char
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(cadr (assoc (char-to-string char)
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tibetan-composite-vowel-alist))))
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(cond
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;; Compose upper vowel sign vertically over.
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((aref (char-category-set char) ?2)
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(setq rule stack-upper))
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;; Compose lower vowel sign vertically under.
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((aref (char-category-set char) ?3)
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(if (eq char ?$(7"Q(B) ;; `$(7"Q(B' should not visible when composed.
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(setq rule nil)
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(setq rule stack-under)))
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;; Transform ra-mgo (superscribed r) if followed by a subjoined
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;; consonant other than w, ', y, r.
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((and (= (car last) ?$(7"C(B)
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(not (memq char '(?$(7#>(B ?$(7"R(B ?$(7#B(B ?$(7#C(B))))
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(setcar last ?$(7!"(B) ;; modified for newfont by Tomabechi 1999/12/10
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(setq rule stack-under))
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;; Transform initial base consonant if followed by a subjoined
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;; consonant but 'a.
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(t
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(let ((laststr (char-to-string (car last))))
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(if (and (/= char ?$(7"R(B) ;; modified for new font by Tomabechi
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(string-match "[$(7"!(B-$(7"="?"@"D(B-$(7"J"K(B]" laststr))
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(setcar last (string-to-char
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(cdr (assoc (char-to-string (car last))
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tibetan-base-to-subjoined-alist)))))
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(setq rule stack-under))))
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(if rule
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(setcdr last (list rule char)))
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;; Added by Tomabechi 2000/06/08
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(if comp-vowel
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(nconc last comp-vowel))
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))
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;;;###autoload
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(defun tibetan-compose-string (str)
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"Compose Tibetan string STR."
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(let ((idx 0))
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;; `$(7"A(B' is included in the pattern for subjoined consonants
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;; because we treat it specially in tibetan-add-components.
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;; (This feature is removed by Tomabechi 2000/06/08)
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(while (setq idx (string-match tibetan-composable-pattern str idx))
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(let ((from idx)
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(to (match-end 0))
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components)
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(if (eq (string-match tibetan-precomposition-rule-regexp str idx) idx)
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(setq idx (match-end 0)
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components
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(list (string-to-char
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(cdr
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(assoc (match-string 0 str)
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tibetan-precomposition-rule-alist)))))
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(setq components (list (aref str idx))
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idx (1+ idx)))
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(while (< idx to)
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(tibetan-add-components components (aref str idx))
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(setq idx (1+ idx)))
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(compose-string str from to components))))
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str)
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;;;###autoload
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(defun tibetan-compose-region (beg end)
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"Compose Tibetan text the region BEG and END."
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(interactive "r")
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(let (str result chars)
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(save-excursion
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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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;; `$(7"A(B' is included in the pattern for subjoined consonants
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;; because we treat it specially in tibetan-add-components.
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;; (This feature is removed by Tomabechi 2000/06/08)
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(while (re-search-forward tibetan-composable-pattern nil t)
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(let ((from (match-beginning 0))
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(to (match-end 0))
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components)
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(goto-char from)
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(if (looking-at tibetan-precomposition-rule-regexp)
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(progn
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(setq components
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(list (string-to-char
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(cdr
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(assoc (match-string 0)
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tibetan-precomposition-rule-alist)))))
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(goto-char (match-end 0)))
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(setq components (list (char-after from)))
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(forward-char 1))
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(while (< (point) to)
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(tibetan-add-components components (following-char))
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(forward-char 1))
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(compose-region from to components)))))))
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(defvar tibetan-decompose-precomposition-alist
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(mapcar (function (lambda (x) (cons (string-to-char (cdr x)) (car x))))
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tibetan-precomposition-rule-alist))
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;;;###autoload
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(defun tibetan-decompose-region (from to)
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"Decompose Tibetan text in the region FROM and TO.
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This is different from decompose-region because precomposed Tibetan characters
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are decomposed into normal Tibetan character sequences."
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(interactive "r")
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(save-restriction
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(narrow-to-region from to)
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(decompose-region from to)
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(goto-char from)
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(while (not (eobp))
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(let* ((char (following-char))
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(slot (assq char tibetan-decompose-precomposition-alist)))
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(if slot
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(progn
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(delete-char 1)
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(insert (cdr slot)))
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(forward-char 1))))))
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;;;###autoload
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(defun tibetan-decompose-string (str)
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"Decompose Tibetan string STR.
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This is different from decompose-string because precomposed Tibetan characters
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are decomposed into normal Tibetan character sequences."
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(let ((new "")
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(len (length str))
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(idx 0)
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char slot)
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(while (< idx len)
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(setq char (aref str idx)
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slot (assq (aref str idx) tibetan-decompose-precomposition-alist)
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new (concat new (if slot (cdr slot) (char-to-string char)))
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idx (1+ idx)))
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new))
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;;;###autoload
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(defun tibetan-composition-function (from to pattern &optional string)
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(if string
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(tibetan-compose-string string)
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(tibetan-compose-region from to))
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(- to from))
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;;;
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;;; This variable is used to avoid repeated decomposition.
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;;;
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(setq-default tibetan-decomposed nil)
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;;;###autoload
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(defun tibetan-decompose-buffer ()
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"Decomposes Tibetan characters in the buffer into their components.
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See also the documentation of the function `tibetan-decompose-region'."
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(interactive)
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(make-local-variable 'tibetan-decomposed)
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(cond ((not tibetan-decomposed)
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(tibetan-decompose-region (point-min) (point-max))
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(setq tibetan-decomposed t))))
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;;;###autoload
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(defun tibetan-compose-buffer ()
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"Composes Tibetan character components in the buffer.
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See also docstring of the function tibetan-compose-region."
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(interactive)
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(make-local-variable 'tibetan-decomposed)
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(tibetan-compose-region (point-min) (point-max))
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(setq tibetan-decomposed nil))
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;;;###autoload
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(defun tibetan-post-read-conversion (len)
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(save-excursion
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(save-restriction
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(let ((buffer-modified-p (buffer-modified-p)))
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(narrow-to-region (point) (+ (point) len))
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(tibetan-compose-region (point-min) (point-max))
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(set-buffer-modified-p buffer-modified-p)
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(make-local-variable 'tibetan-decomposed)
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(setq tibetan-decomposed nil)
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(- (point-max) (point-min))))))
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;;;###autoload
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(defun tibetan-pre-write-conversion (from to)
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(setq tibetan-decomposed-temp tibetan-decomposed)
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(let ((old-buf (current-buffer)))
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(set-buffer (generate-new-buffer " *temp*"))
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(if (stringp from)
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(insert from)
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(insert-buffer-substring old-buf from to))
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(if (not tibetan-decomposed-temp)
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(tibetan-decompose-region (point-min) (point-max)))
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;; Should return nil as annotations.
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nil))
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;;;
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;;; Unicode-related definitions.
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;;;
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(defvar tibetan-canonicalize-for-unicode-alist
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'(("$(7"Q(B" . "") ;; remove vowel a
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("$(7"T(B" . "$(7"R"S(B") ;; decompose vowels whose use is ``discouraged'' in Unicode 3.0
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("$(7"V(B" . "$(7"R"U(B")
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("$(7"W(B" . "$(7#C"a(B")
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("$(7"X(B" . "$(7#C"R"a(B")
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("$(7"Y(B" . "$(7#D"a(B")
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("$(7"Z(B" . "$(7#D"R"a(B")
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("$(7"b(B" . "$(7"R"a(B"))
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"Rules for canonicalizing Tibetan vowels for Unicode.")
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(defvar tibetan-canonicalize-for-unicode-regexp
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"[$(7"Q"T"V"W"X"Y"Z"b(B]"
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"Regexp for Tibetan vowels to be canonicalized in Unicode.")
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(defun tibetan-canonicalize-for-unicode-region (from to)
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(save-restriction
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(narrow-to-region from to)
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(goto-char from)
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(while (re-search-forward tibetan-canonicalize-for-unicode-regexp nil t)
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(let (
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;;(from (match-beginning 0))
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;;(to (match-end 0))
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(canonical-form
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(cdr (assoc (match-string 0)
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tibetan-canonicalize-for-unicode-alist))))
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;;(goto-char from)
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;;(delete-region from to)
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;;(insert canonical-form)
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(replace-match canonical-form)
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))))
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(defvar tibetan-strict-unicode t
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"*Flag to control Tibetan canonicalizing for Unicode.
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If non-nil, the vowel a is removed and composite vowels are decomposed
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before writing buffer in Unicode. See also
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`tibetan-canonicalize-for-unicode-regexp' and
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`tibetan-canonicalize-for-unicode-alist'.")
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;;;###autoload
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(defun tibetan-pre-write-canonicalize-for-unicode (from to)
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(let ((old-buf (current-buffer))
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(strict-unicode tibetan-strict-unicode))
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(set-buffer (generate-new-buffer " *temp*"))
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(if (stringp from)
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(insert from)
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(insert-buffer-substring old-buf from to))
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(if strict-unicode
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(tibetan-canonicalize-for-unicode-region (point-min) (point-max)))
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;; Should return nil as annotations.
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nil))
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(provide 'tibet-util)
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;;; arch-tag: 7a7333e8-1584-446c-b39c-a02b9def265d
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;;; tibet-util.el ends here
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