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381 lines
12 KiB
EmacsLisp
381 lines
12 KiB
EmacsLisp
;;; tml-util.el --- support for composing tamil characters -*-coding: iso-2022-7bit;-*-
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;; Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
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;; Free Software Foundation, Inc.
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;; Maintainer: KAWABATA, Taichi <kawabata@m17n.org>
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;; Keywords: multilingual, Indian, Tamil
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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, 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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;; Created: Nov. 08. 2002
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;;; Commentary:
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;; This file provides character(Unicode) to glyph(CDAC) conversion and
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;; composition of Tamil script characters.
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;;; Code:
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;; Tamil Composable Pattern
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;; C .. Consonants
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;; V .. Vowel
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;; H .. Pulli
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;; M .. Matra
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;; V .. Vowel
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;; A .. Anuswar
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;; D .. Chandrabindu
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;; 1. vowel
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;; V
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;; 2. syllable : only ligature-formed pattern forms composition.
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;; (CkHCs|C)(H|M)?
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;; 3. sri special
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;; (CsHCrVi)
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;; oririnal
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;; ((CH)?(CH)?(CH)?CH)?C(H|M?(A|D)?)?
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(defconst tamil-consonant
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"[$,1<5(B-$,1<Y(B]")
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(defconst tamil-composable-pattern
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(concat
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"\\([$,1<%(B-$,1<4(B]\\)\\|"
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"[$,1<"<#(B]\\|" ;; vowel modifier considered independent
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"\\(\\(?:\\(?:$,1<5<m<W(B\\)\\|[$,1<5(B-$,1<Y(B]\\)[$,1<m<^(B-$,1<l(B]?\\)\\|"
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"\\($,1<W<m<P<`(B\\)")
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"Regexp matching a composable sequence of Tamil characters.")
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;;;###autoload
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(defun tamil-compose-region (from to)
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(interactive "r")
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(save-excursion
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(save-restriction
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(narrow-to-region from to)
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(goto-char (point-min))
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(while (re-search-forward tamil-composable-pattern nil t)
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(tamil-compose-syllable-region (match-beginning 0)
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(match-end 0))))))
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(defun tamil-compose-string (string)
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(with-temp-buffer
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(insert (decompose-string string))
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(tamil-compose-region (point-min) (point-max))
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(buffer-string)))
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;;;###autoload
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(defun tamil-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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(tamil-compose-region (point-min) (point-max))
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(set-buffer-modified-p buffer-modified-p)
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(- (point-max) (point-min))))))
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(defun tamil-range (from to)
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"Make the list of the integers of range FROM to TO."
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(let (result)
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(while (<= from to) (setq result (cons to result) to (1- to))) result))
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(defun tamil-regexp-of-hashtbl-keys (hashtbl)
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"Return a regular expression that matches all keys in hashtable HASHTBL."
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(let ((max-specpdl-size 1000))
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(regexp-opt
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(sort
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(let (dummy)
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(maphash (function (lambda (key val) (setq dummy (cons key dummy)))) hashtbl)
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dummy)
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(function (lambda (x y) (> (length x) (length y))))))))
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;; Notes on conversion steps.
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;; 1. chars to glyphs
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;; Simple replacement of characters to glyphs is done.
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;; 2. glyphs reordering.
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;; following "$,4)j(B", "$,4)k(B", "$,4)l(B" goes to the front.
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;; 3. glyphs to glyphs
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;; reordered vowels are ligatured to consonants.
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;; 4. Composition.
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;; left modifiers will be attached at the left.
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;; others will be attached right.
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(defvar tml-char-glyph
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'(;; various signs
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("$,1<"(B" . "$,4)b(B") ;; not good
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("$,1<#(B" . "$,4*G(B")
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;; Independent Vowels
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("$,1<%(B" . "$,4*<(B")
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("$,1<&(B" . "$,4*=(B")
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("$,1<'(B" . "$,4*>(B")
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("$,1<((B" . "$,4*?(B")
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("$,1<)(B" . "$,4*@(B")
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("$,1<*(B" . "$,4*A(B")
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("$,1<.(B" . "$,4*B(B")
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("$,1</(B" . "$,4*C(B")
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("$,1<0(B" . "$,4*D(B")
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("$,1<2(B" . "$,4*E(B")
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("$,1<3(B" . "$,4*F(B")
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("$,1<4(B" . "$,4*E*W(B")
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;; Consonants
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("$,1<5<m<W<m(B" . "$,4):(B") ; ks.
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("$,1<5<m<W(B" . "$,4*^(B") ; ks
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("$,1<5(B" . "$,4*H(B")
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("$,1<9(B" . "$,4*I(B")
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("$,1<:(B" . "$,4*J(B")
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("$,1<<(B" . "$,4*\(B")
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("$,1<<<m(B" . "$,4)8(B")
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("$,1<>(B" . "$,4*K(B")
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("$,1<?(B" . "$,4*L(B")
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("$,1<C(B" . "$,4*M(B")
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("$,1<D(B" . "$,4*N(B")
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("$,1<H(B" . "$,4*O(B")
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("$,1<I(B" . "$,4*Y(B")
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("$,1<I<m(B" . "$,4)a(B")
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("$,1<J(B" . "$,4*P(B")
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("$,1<N(B" . "$,4*Q(B")
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("$,1<O(B" . "$,4*R(B")
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("$,1<P(B" . "$,4*S(B")
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("$,1<Q(B" . "$,4*X(B")
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("$,1<R(B" . "$,4*T(B")
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("$,1<S(B" . "$,4*W(B")
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("$,1<T(B" . "$,4*V(B")
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("$,1<U(B" . "$,4*U(B")
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("$,1<W(B" . "$,4*[(B")
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("$,1<W<m(B" . "$,4)7(B")
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("$,1<W<m<P<`(B" . "$,4*_(B")
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("$,1<X(B" . "$,4*Z(B")
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("$,1<X<m(B" . "$,4)6(B")
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("$,1<Y(B" . "$,4*](B")
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("$,1<Y<m(B" . "$,4)9(B")
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;; Dependent vowel signs
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("$,1<^(B" . "$,4)c(B")
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("$,1<_(B" . "$,4)d(B")
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("$,1<`(B" . "$,4)f(B")
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("$,1<a(B" . "$,4)g(B")
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("$,1<b(B" . "$,4)h(B")
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("$,1<f(B" . "$,4)j(B")
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("$,1<g(B" . "$,4)k(B")
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("$,1<h(B" . "$,4)l(B")
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("$,1<j(B" . "$,4)j)c(B")
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("$,1<k(B" . "$,4)k)c(B")
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("$,1<l(B" . "$,4)j*W(B")
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;; Various signs
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("$,1<m(B" . "$,4)b(B")
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("$,1<w(B" . "nil") ;; not supported?
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))
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(defvar tml-char-glyph-hash
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(let* ((hash (make-hash-table :test 'equal)))
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(mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
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tml-char-glyph)
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hash))
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(defvar tml-char-glyph-regexp
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(tamil-regexp-of-hashtbl-keys tml-char-glyph-hash))
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;; Tamil languages needed to be reordered.
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(defvar tml-consonants-regexp
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"[$,4*H*^*I*J*\*K*L*M*N*O*Y*P*Q*R*S*X*T*W*V*U*[*Z*](B]")
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(defvar tml-glyph-reorder-key-glyphs "[$,4)j)k)l(B]")
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(defvar tml-glyph-reordering-regexp-list
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(cons
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(concat "\\(" tml-consonants-regexp "\\)\\([$,4)j)k)l(B]\\)") "\\2\\1"))
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;; Tamil vowel modifiers to be ligatured.
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(defvar tml-glyph-glyph
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'(
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("$,4*H)d(B" . "$,4(a(B") ; ki
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("$,4*^)d(B" . "$,4(v(B") ; ksi
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("$,4*^)f(B" . "$,4)2(B") ; ksi~
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("$,4*I)d(B" . "$,4(b(B") ; n^i
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("$,4*J)d(B" . "$,4(c(B") ; ci
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("$,4*K)d(B" . "$,4(d(B") ; n~i
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("$,4*L)d(B" . "$,4)n(B") ; t.i
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("$,4*M)d(B" . "$,4(e(B") ; n.i
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("$,4*N)d(B" . "$,4(f(B") ; ti
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("$,4*O)d(B" . "$,4(g(B") ; ni
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("$,4*P)d(B" . "$,4(h(B") ; pi
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("$,4*Q)d(B" . "$,4(i(B") ; mi
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("$,4*R)d(B" . "$,4(j(B") ; yi
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("$,4*S)d(B" . "$,4(k(B") ; ri
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("$,4*T)d(B" . "$,4(l(B") ; li
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("$,4*U)d(B" . "$,4(m(B") ; vi
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("$,4*V)d(B" . "$,4(n(B") ; l_i
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("$,4*W)d(B" . "$,4(o(B") ; l.i
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("$,4*X)d(B" . "$,4(p(B") ; r_i
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("$,4*Y)d(B" . "$,4(q(B") ; n_i
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("$,4*Z)d(B" . "$,4(r(B") ; si
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("$,4*[)d(B" . "$,4(s(B") ; s'i
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("$,4*\)d(B" . "$,4(t(B") ; ji
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("$,4*])d(B" . "$,4(u(B") ; hi
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("$,4*H)f(B" . "$,4(w(B") ; ki~
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("$,4*I)f(B" . "$,4(x(B") ; n^i~
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("$,4*J)f(B" . "$,4(y(B") ; ci~
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("$,4*K)f(B" . "$,4(z(B") ; n~i~
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("$,4*L)f(B" . "$,4)o(B") ; t.i~
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("$,4*M)f(B" . "$,4)!(B") ; n.i~
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("$,4*N)f(B" . "$,4)"(B") ; ti~
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("$,4*O)f(B" . "$,4)#(B") ; ni~
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("$,4*P)f(B" . "$,4)$(B") ; pi~
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("$,4*Q)f(B" . "$,4)%(B") ; mi~
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("$,4*R)f(B" . "$,4)&(B") ; yi~
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("$,4*S)f(B" . "$,4)'(B") ; ri~
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("$,4*T)f(B" . "$,4)((B") ; li~
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("$,4*U)f(B" . "$,4))(B") ; vi~
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("$,4*V)f(B" . "$,4)*(B") ; l_i~
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("$,4*W)f(B" . "$,4)+(B") ; l.i~
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("$,4*X)f(B" . "$,4),(B") ; r_i~
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("$,4*Y)f(B" . "$,4)-(B") ; n_i~
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("$,4*Z)f(B" . "$,4).(B") ; si~
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("$,4*[)f(B" . "$,4)/(B") ; s'i~
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("$,4*\)f(B" . "$,4)0(B") ; ji~
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("$,4*])f(B" . "$,4)1(B") ; hi~
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("$,4*H)g(B" . "$,4)p(B") ; ku
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("$,4*I)g(B" . "$,4)q(B") ; n^u
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("$,4*J)g(B" . "$,4)r(B") ; cu
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("$,4*K)g(B" . "$,4)s(B") ; n~u
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("$,4*L)g(B" . "$,4)t(B") ; t.u
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("$,4*M)g(B" . "$,4)u(B") ; n.u
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("$,4*N)g(B" . "$,4)v(B") ; tu
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("$,4*O)g(B" . "$,4)x(B") ; nu
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("$,4*P)g(B" . "$,4)y(B") ; pu
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("$,4*Q)g(B" . "$,4)z(B") ; mu
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("$,4*R)g(B" . "$,4){(B") ; yu
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("$,4*S)g(B" . "$,4)|(B") ; ru
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("$,4*T)g(B" . "$,4)}(B") ; lu
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("$,4*U)g(B" . "$,4)~(B") ; vu
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("$,4*V)g(B" . "$,4)(B") ; l_u
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("$,4*W)g(B" . "$,4* (B") ; l.u
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("$,4*X)g(B" . "$,4*!(B") ; r_u
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("$,4*Y)g(B" . "$,4*"(B") ; n_u
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("$,4*H)h(B" . "$,4*#(B") ; ku~
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("$,4*I)h(B" . "$,4*$(B") ; n^u~
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("$,4*J)h(B" . "$,4*%(B") ; cu~
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("$,4*K)h(B" . "$,4*&(B") ; n~u~
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("$,4*L)h(B" . "$,4*'(B") ; t.u~
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("$,4*M)h(B" . "$,4*((B") ; n.u~
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("$,4*N)h(B" . "$,4*)(B") ; tu~
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("$,4*O)h(B" . "$,4*+(B") ; nu~
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("$,4*P)h(B" . "$,4*,(B") ; pu~
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("$,4*Q)h(B" . "$,4*-(B") ; mu~
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("$,4*R)h(B" . "$,4*.(B") ; yu~
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("$,4*S)h(B" . "$,4*/(B") ; ru~
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("$,4*T)h(B" . "$,4*6(B") ; lu~
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("$,4*U)h(B" . "$,4*7(B") ; vu~
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("$,4*V)h(B" . "$,4*8(B") ; l_u~
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("$,4*W)h(B" . "$,4*9(B") ; l.u~
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("$,4*X)h(B" . "$,4*:(B") ; r_u~
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("$,4*Y)h(B" . "$,4*;(B") ; n_u~
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))
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(defvar tml-glyph-glyph-hash
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(let* ((hash (make-hash-table :test 'equal)))
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(mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
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tml-glyph-glyph)
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hash))
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(defvar tml-glyph-glyph-regexp
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(tamil-regexp-of-hashtbl-keys tml-glyph-glyph-hash))
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(defun tamil-compose-syllable-string (string)
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(with-temp-buffer
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(insert (decompose-string string))
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(tamil-compose-syllable-region (point-min) (point-max))
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(buffer-string)))
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(defun tamil-compose-syllable-region (from to)
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"Compose tamil syllable in region FROM to TO."
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(let (glyph-str match-str glyph-reorder-regexps)
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(save-excursion
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(save-restriction
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(narrow-to-region from to)
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(goto-char (point-min))
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;; char-glyph-conversion
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(while (not (eobp))
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(if (looking-at tml-char-glyph-regexp)
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(progn
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(setq match-str (match-string 0)
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glyph-str
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(concat glyph-str
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(gethash match-str tml-char-glyph-hash)))
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(goto-char (match-end 0)))
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(setq glyph-str (concat glyph-str (string (following-char))))
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(forward-char 1)))
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(or glyph-str
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(aset glyph-str 0 (following-char)))
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;; glyph reordering
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(when (string-match tml-glyph-reorder-key-glyphs glyph-str)
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(if (string-match (car tml-glyph-reordering-regexp-list)
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glyph-str)
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(setq glyph-str
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(replace-match (cdr tml-glyph-reordering-regexp-list)
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nil nil glyph-str))))
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;; glyph-glyph-conversion
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(when (string-match tml-glyph-glyph-regexp glyph-str)
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(setq match-str (match-string 0 glyph-str))
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(setq glyph-str
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(replace-match (gethash match-str tml-glyph-glyph-hash)
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nil nil glyph-str)))
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;; concatenate and attach reference-points.
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(setq glyph-str
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(cdr
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(apply
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'nconc
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(mapcar
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(function
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(lambda (x) (list '(5 . 3) x))) ;; default ref. point.
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glyph-str))))
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(compose-region from to glyph-str)))))
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;;;###autoload
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(defun tamil-composition-function (pos &optional string)
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"Compose Tamil characters after the position POS.
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If STRING is not nil, it is a string, and POS is an index to the string.
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In this case, compose characters after POS of the string."
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(if string
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(if auto-compose-current-font
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(if (eq (string-match "[$,1< (B-$,1=?(B]+" pos) pos)
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(or (font-shape-text 0 (match-end 0) auto-compose-current-font
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string)
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pos)))
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(goto-char pos)
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(if auto-compose-current-font
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(if (looking-at "[$,1< (B-$,1=?(B]+")
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(or (font-shape-text pos (match-end 0) auto-compose-current-font))
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(if (looking-at tamil-composable-pattern)
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(prog1 (match-end 0)
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(tamil-compose-syllable-region pos (match-end 0))))))))
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(provide 'tml-util)
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;;; arch-tag: 4d1c9737-e7b1-44cf-a040-4f64c50e773e
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;;; tml-util.el ends here
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