mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-16 09:50:25 +00:00
370 lines
12 KiB
EmacsLisp
370 lines
12 KiB
EmacsLisp
;;; 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., 51 Franklin Street, Fifth Floor,
|
||
;; Boston, MA 02110-1301, 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)))
|
||
|
||
;;;###autoload
|
||
(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)
|
||
|
||
;;; arch-tag: 4d1c9737-e7b1-44cf-a040-4f64c50e773e
|
||
;;; tml-util.el ends here
|