diff options
Diffstat (limited to 'lisp/language/tml-util.el')
| -rw-r--r-- | lisp/language/tml-util.el | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/lisp/language/tml-util.el b/lisp/language/tml-util.el new file mode 100644 index 00000000000..bb8c8f19e04 --- /dev/null +++ b/lisp/language/tml-util.el @@ -0,0 +1,367 @@ +;;; tml-util.el --- support for composing tamil characters -*-coding: iso-2022-7bit;-*- + +;; Copyright (C) 2001 Free Software Foundation, Inc. + +;; Maintainer: KAWABATA, Taichi <kawabata@m17n.org> +;; Keywords: multilingual, Indian, Tamil + +;; 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., 59 Temple Place - Suite 330, +;; Boston, MA 02111-1307, USA. + +;; Created: Nov. 08. 2002 + +;;; Commentary: + +;; This file provides character(Unicode) to glyph(CDAC) conversion and +;; composition of Tamil script characters. + +;;; Code: + +;; Tamil Composable Pattern +;; C .. Consonants +;; V .. Vowel +;; H .. Pulli +;; M .. Matra +;; V .. Vowel +;; A .. Anuswar +;; D .. Chandrabindu +;; 1. vowel +;; V +;; 2. syllable : only ligature-formed pattern forms composition. +;; (CkHCs|C)(H|M)? +;; 3. sri special +;; (CsHCrVi) + +;; oririnal +;; ((CH)?(CH)?(CH)?CH)?C(H|M?(A|D)?)? + +(defconst tamil-consonant + "[$,1<5(B-$,1<Y(B]") + +(defconst tamil-composable-pattern + (concat + "\\([$,1<%(B-$,1<4(B]\\)\\|" + "[$,1<"<#(B]\\|" ;; vowel modifier considered independent + "\\(\\(?:\\(?:$,1<5<m<W(B\\)\\|[$,1<5(B-$,1<Y(B]\\)[$,1<m<^(B-$,1<l(B]?\\)\\|" + "\\($,1<W<m<P<`(B\\)") + "Regexp matching a composable sequence of Tamil characters.") + +;;;###autoload +(defun tamil-compose-region (from to) + (interactive "r") + (save-excursion + (save-restriction + (narrow-to-region from to) + (goto-char (point-min)) + (while (re-search-forward tamil-composable-pattern nil t) + (tamil-compose-syllable-region (match-beginning 0) + (match-end 0)))))) +(defun tamil-compose-string (string) + (with-temp-buffer + (insert (decompose-string string)) + (tamil-compose-region (point-min) (point-max)) + (buffer-string))) + +(defun tamil-post-read-conversion (len) + (save-excursion + (save-restriction + (let ((buffer-modified-p (buffer-modified-p))) + (narrow-to-region (point) (+ (point) len)) + (tamil-compose-region (point-min) (point-max)) + (set-buffer-modified-p buffer-modified-p) + (- (point-max) (point-min)))))) + +(defun tamil-range (from to) + "Make the list of the integers of range FROM to TO." + (let (result) + (while (<= from to) (setq result (cons to result) to (1- to))) result)) + +(defun tamil-regexp-of-hashtbl-keys (hashtbl) + "Return a regular expression that matches all keys in hashtable HASHTBL." + (let ((max-specpdl-size 1000)) + (regexp-opt + (sort + (let (dummy) + (maphash (function (lambda (key val) (setq dummy (cons key dummy)))) hashtbl) + dummy) + (function (lambda (x y) (> (length x) (length y)))))))) + + +;;;###autoload +(defun tamil-composition-function (from to pattern &optional string) + "Compose Tamil characters in REGION, or STRING if specified. +Assume that the REGION or STRING must fully match the composable +PATTERN regexp." + (if string (tamil-compose-syllable-string string) + (tamil-compose-syllable-region from to)) + (- to from)) + +;; Register a function to compose Tamil characters. +(mapc + (function (lambda (ucs) + (aset composition-function-table (decode-char 'ucs ucs) + (list (cons tamil-composable-pattern + 'tamil-composition-function))))) + (nconc '(#x0b82 #x0b83) (tamil-range #x0b85 #x0bb9))) + +;; Notes on conversion steps. + +;; 1. chars to glyphs +;; Simple replacement of characters to glyphs is done. + +;; 2. glyphs reordering. +;; following "$,4)j(B", "$,4)k(B", "$,4)l(B" goes to the front. + +;; 3. glyphs to glyphs +;; reordered vowels are ligatured to consonants. + +;; 4. Composition. +;; left modifiers will be attached at the left. +;; others will be attached right. + +(defvar tml-char-glyph + '(;; various signs + ;;("$,1<"(B" . "") + ("$,1<#(B" . "$,4*G(B") + ;; Independent Vowels + ("$,1<%(B" . "$,4*<(B") + ("$,1<&(B" . "$,4*=(B") + ("$,1<'(B" . "$,4*>(B") + ("$,1<((B" . "$,4*?(B") + ("$,1<)(B" . "$,4*@(B") + ("$,1<*(B" . "$,4*A(B") + ("$,1<.(B" . "$,4*B(B") + ("$,1</(B" . "$,4*C(B") + ("$,1<0(B" . "$,4*D(B") + ("$,1<2(B" . "$,4*E(B") + ("$,1<3(B" . "$,4*F(B") + ("$,1<4(B" . "$,4*E*W(B") + ;; Consonants + ("$,1<5<m<W<m(B" . "$,4):(B") ; ks. + ("$,1<5<m<W(B" . "$,4*^(B") ; ks + ("$,1<5(B" . "$,4*H(B") + + ("$,1<9(B" . "$,4*I(B") + ("$,1<:(B" . "$,4*J(B") + ("$,1<<(B" . "$,4*\(B") + ("$,1<<<m(B" . "$,4)8(B") + ("$,1<>(B" . "$,4*K(B") + ("$,1<?(B" . "$,4*L(B") + ("$,1<C(B" . "$,4*M(B") + ("$,1<D(B" . "$,4*N(B") + ("$,1<H(B" . "$,4*O(B") + ("$,1<I(B" . "$,4*Y(B") + ("$,1<I<m(B" . "$,4)a(B") + ("$,1<J(B" . "$,4*P(B") + ("$,1<N(B" . "$,4*Q(B") + ("$,1<O(B" . "$,4*R(B") + ("$,1<P(B" . "$,4*S(B") + ("$,1<Q(B" . "$,4*X(B") + ("$,1<R(B" . "$,4*T(B") + ("$,1<S(B" . "$,4*W(B") + ("$,1<T(B" . "$,4*V(B") + ("$,1<U(B" . "$,4*U(B") + ("$,1<W(B" . "$,4*[(B") + ("$,1<W<m(B" . "$,4)7(B") + ("$,1<W<m<P<`(B" . "$,4*_(B") + ("$,1<X(B" . "$,4*Z(B") + ("$,1<X<m(B" . "$,4)6(B") + ("$,1<Y(B" . "$,4*](B") + ("$,1<Y<m(B" . "$,4)9(B") + + ;; Dependent vowel signs + ("$,1<^(B" . "$,4)c(B") + ("$,1<_(B" . "$,4)d(B") + ("$,1<`(B" . "$,4)f(B") + ("$,1<a(B" . "$,4)g(B") + ("$,1<b(B" . "$,4)h(B") + ("$,1<f(B" . "$,4)j(B") + ("$,1<g(B" . "$,4)k(B") + ("$,1<h(B" . "$,4)l(B") + ("$,1<j(B" . "$,4)j)c(B") + ("$,1<k(B" . "$,4)k)c(B") + ("$,1<l(B" . "$,4)j*W(B") + + ;; Various signs + ("$,1<m(B" . "$,4)b(B") + ("$,1<w(B" . "nil") ;; not supported? + )) + +(defvar tml-char-glyph-hash + (let* ((hash (make-hash-table :test 'equal))) + (mapc (function (lambda (x) (puthash (car x) (cdr x) hash))) + tml-char-glyph) + hash)) + +(defvar tml-char-glyph-regexp + (tamil-regexp-of-hashtbl-keys tml-char-glyph-hash)) + +;; Tamil languages needed to be reordered. + +(defvar tml-consonants-regexp + "[$,4*H*^*I*J*\*K*L*M*N*O*Y*P*Q*R*S*X*T*W*V*U*[*Z*](B]") + +(defvar tml-glyph-reorder-key-glyphs "[$,4)j)k)l(B]") + +(defvar tml-glyph-reordering-regexp-list + (cons + (concat "\\(" tml-consonants-regexp "\\)\\([$,4)j)k)l(B]\\)") "\\2\\1")) + +;; Tamil vowel modifiers to be ligatured. +(defvar tml-glyph-glyph + '( + ("$,4*H)d(B" . "$,4(a(B") ; ki + ("$,4*^)d(B" . "$,4(v(B") ; ksi + ("$,4*^)f(B" . "$,4)2(B") ; ksi~ + ("$,4*I)d(B" . "$,4(b(B") ; n^i + ("$,4*J)d(B" . "$,4(c(B") ; ci + ("$,4*K)d(B" . "$,4(d(B") ; n~i + ("$,4*L)d(B" . "$,4)n(B") ; t.i + ("$,4*M)d(B" . "$,4(e(B") ; n.i + ("$,4*N)d(B" . "$,4(f(B") ; ti + ("$,4*O)d(B" . "$,4(g(B") ; ni + ("$,4*P)d(B" . "$,4(h(B") ; pi + ("$,4*Q)d(B" . "$,4(i(B") ; mi + ("$,4*R)d(B" . "$,4(j(B") ; yi + ("$,4*S)d(B" . "$,4(k(B") ; ri + ("$,4*T)d(B" . "$,4(l(B") ; li + ("$,4*U)d(B" . "$,4(m(B") ; vi + ("$,4*V)d(B" . "$,4(n(B") ; l_i + ("$,4*W)d(B" . "$,4(o(B") ; l.i + ("$,4*X)d(B" . "$,4(p(B") ; r_i + ("$,4*Y)d(B" . "$,4(q(B") ; n_i + ("$,4*Z)d(B" . "$,4(r(B") ; si + ("$,4*[)d(B" . "$,4(s(B") ; s'i + ("$,4*\)d(B" . "$,4(t(B") ; ji + ("$,4*])d(B" . "$,4(u(B") ; hi + + ("$,4*H)f(B" . "$,4(w(B") ; ki~ + ("$,4*I)f(B" . "$,4(x(B") ; n^i~ + ("$,4*J)f(B" . "$,4(y(B") ; ci~ + ("$,4*K)f(B" . "$,4(z(B") ; n~i~ + ("$,4*L)f(B" . "$,4)o(B") ; t.i~ + ("$,4*M)f(B" . "$,4)!(B") ; n.i~ + ("$,4*N)f(B" . "$,4)"(B") ; ti~ + ("$,4*O)f(B" . "$,4)#(B") ; ni~ + ("$,4*P)f(B" . "$,4)$(B") ; pi~ + ("$,4*Q)f(B" . "$,4)%(B") ; mi~ + ("$,4*R)f(B" . "$,4)&(B") ; yi~ + ("$,4*S)f(B" . "$,4)'(B") ; ri~ + ("$,4*T)f(B" . "$,4)((B") ; li~ + ("$,4*U)f(B" . "$,4))(B") ; vi~ + ("$,4*V)f(B" . "$,4)*(B") ; l_i~ + ("$,4*W)f(B" . "$,4)+(B") ; l.i~ + ("$,4*X)f(B" . "$,4),(B") ; r_i~ + ("$,4*Y)f(B" . "$,4)-(B") ; n_i~ + ("$,4*Z)f(B" . "$,4).(B") ; si~ + ("$,4*[)f(B" . "$,4)/(B") ; s'i~ + ("$,4*\)f(B" . "$,4)0(B") ; ji~ + ("$,4*])f(B" . "$,4)1(B") ; hi~ + + ("$,4*H)g(B" . "$,4)p(B") ; ku + ("$,4*I)g(B" . "$,4)q(B") ; n^u + ("$,4*J)g(B" . "$,4)r(B") ; cu + ("$,4*K)g(B" . "$,4)s(B") ; n~u + ("$,4*L)g(B" . "$,4)t(B") ; t.u + ("$,4*M)g(B" . "$,4)u(B") ; n.u + ("$,4*N)g(B" . "$,4)v(B") ; tu + ("$,4*O)g(B" . "$,4)x(B") ; nu + ("$,4*P)g(B" . "$,4)y(B") ; pu + ("$,4*Q)g(B" . "$,4)z(B") ; mu + ("$,4*R)g(B" . "$,4){(B") ; yu + ("$,4*S)g(B" . "$,4)|(B") ; ru + ("$,4*T)g(B" . "$,4)}(B") ; lu + ("$,4*U)g(B" . "$,4)~(B") ; vu + ("$,4*V)g(B" . "$,4)(B") ; l_u + ("$,4*W)g(B" . "$,4* (B") ; l.u + ("$,4*X)g(B" . "$,4*!(B") ; r_u + ("$,4*Y)g(B" . "$,4*"(B") ; n_u + + ("$,4*H)h(B" . "$,4*#(B") ; ku~ + ("$,4*I)h(B" . "$,4*$(B") ; n^u~ + ("$,4*J)h(B" . "$,4*%(B") ; cu~ + ("$,4*K)h(B" . "$,4*&(B") ; n~u~ + ("$,4*L)h(B" . "$,4*'(B") ; t.u~ + ("$,4*M)h(B" . "$,4*((B") ; n.u~ + ("$,4*N)h(B" . "$,4*)(B") ; tu~ + ("$,4*O)h(B" . "$,4*+(B") ; nu~ + ("$,4*P)h(B" . "$,4*,(B") ; pu~ + ("$,4*Q)h(B" . "$,4*-(B") ; mu~ + ("$,4*R)h(B" . "$,4*.(B") ; yu~ + ("$,4*S)h(B" . "$,4*/(B") ; ru~ + ("$,4*T)h(B" . "$,4*6(B") ; lu~ + ("$,4*U)h(B" . "$,4*7(B") ; vu~ + ("$,4*V)h(B" . "$,4*8(B") ; l_u~ + ("$,4*W)h(B" . "$,4*9(B") ; l.u~ + ("$,4*X)h(B" . "$,4*:(B") ; r_u~ + ("$,4*Y)h(B" . "$,4*;(B") ; n_u~ + )) + +(defvar tml-glyph-glyph-hash + (let* ((hash (make-hash-table :test 'equal))) + (mapc (function (lambda (x) (puthash (car x) (cdr x) hash))) + tml-glyph-glyph) + hash)) + +(defvar tml-glyph-glyph-regexp + (tamil-regexp-of-hashtbl-keys tml-glyph-glyph-hash)) + +(defun tamil-compose-syllable-string (string) + (with-temp-buffer + (insert (decompose-string string)) + (tamil-compose-syllable-region (point-min) (point-max)) + (buffer-string))) + +(defun tamil-compose-syllable-region (from to) + "Compose tamil syllable in region FROM to TO." + (let (glyph-str match-str glyph-reorder-regexps) + (save-excursion + (save-restriction + (narrow-to-region from to) + (goto-char (point-min)) + ;; char-glyph-conversion + (while (re-search-forward tml-char-glyph-regexp nil t) + (setq match-str (match-string 0)) + (setq glyph-str + (concat glyph-str (gethash match-str tml-char-glyph-hash)))) + ;; glyph reordering + (when (string-match tml-glyph-reorder-key-glyphs glyph-str) + (if (string-match (car tml-glyph-reordering-regexp-list) + glyph-str) + (setq glyph-str + (replace-match (cdr tml-glyph-reordering-regexp-list) + nil nil glyph-str)))) + ;; glyph-glyph-conversion + (when (string-match tml-glyph-glyph-regexp glyph-str) + (setq match-str (match-string 0 glyph-str)) + (setq glyph-str + (replace-match (gethash match-str tml-glyph-glyph-hash) + nil nil glyph-str))) + ;; concatenate and attach reference-points. + (setq glyph-str + (cdr + (apply + 'nconc + (mapcar + (function + (lambda (x) (list '(5 . 3) x))) ;; default ref. point. + glyph-str)))) + (compose-region from to glyph-str))))) + +(provide 'tml-util) + +;;; tml-util.el ends here |