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diff --git a/lisp/language/knd-util.el b/lisp/language/knd-util.el new file mode 100644 index 00000000000..75e8b93d17a --- /dev/null +++ b/lisp/language/knd-util.el @@ -0,0 +1,541 @@ +;;; knd-util.el --- Support for composing Kannada characters + +;; Copyright (C) 2003 Free Software Foundation, Inc. + +;; Maintainer: Maintainer: CHOWKSEY, Kailash C. <klchxbec@m-net.arbornet.org> +;; Keywords: multilingual, Kannada + +;; 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: Jul. 14. 2003 + +;;; Commentary: + +;; This file provides character(Unicode) to glyph(CDAC) conversion and +;; composition of Kannada script characters. + +;;; Code: + +;;;###autoload + +;; Kannada Composable Pattern +;; C .. Consonants +;; V .. Vowel +;; H .. Virama +;; M .. Matra +;; V .. Vowel +;; (N .. Zerowidth Non Joiner) +;; (J .. Zerowidth Joiner. ) +;; 1. vowel +;; V(A)? +;; 2. syllable : maximum of 5 consecutive consonants. (e.g. kartsnya) +;; ((CH)?(CH)?(CH)?CH)?C(H|M?)? + +(defconst kannada-consonant + "[$,1>u(B-$,1?9(B]") + +(defconst kannada-consonant-needs-twirl + "[$,1>u>w(B-$,1>{>}(B-$,1>~? (B-$,1?"?$(B-$,1?+?-?0?3(B-$,1?9(B]\\($,1?M(B[$,1>u(B-$,1?9(B]\\)*[$,1?A?B?C?D>b(B]?$") + +(defconst kannada-composable-pattern + (concat + "\\([$,1>b(B-$,1>t?`>l(B]\\)\\|[$,1>c(B]" + "\\|\\(" + "\\(?:\\(?:[$,1>u(B-$,1?9(B]$,1?M(B\\)?\\(?:[$,1>u(B-$,1?9(B]$,1?M(B\\)?\\(?:[$,1>u(B-$,1?9(B]$,1?M(B\\)?[$,1>u(B-$,1?9(B]$,1?M(B\\)?" + "[$,1>u(B-$,1?9(B]\\(?:$,1?M(B\\|[$,1?>(B-$,1?M?U?C(B]?\\)?" + "\\)") + "Regexp matching a composable sequence of Kannada characters.") + +;;;###autoload +(defun kannada-compose-region (from to) + (interactive "r") + (save-excursion + (save-restriction + (narrow-to-region from to) + (goto-char (point-min)) + (while (re-search-forward kannada-composable-pattern nil t) + (kannada-compose-syllable-region (match-beginning 0) + (match-end 0)))))) +;;;###autoload +(defun kannada-compose-string (string) + (with-temp-buffer + (insert (decompose-string string)) + (kannada-compose-region (point-min) (point-max)) + (buffer-string))) + +;;;###autoload +(defun kannada-post-read-conversion (len) + (save-excursion + (save-restriction + (let ((buffer-modified-p (buffer-modified-p))) + (narrow-to-region (point) (+ (point) len)) + (kannada-compose-region (point-min) (point-max)) + (set-buffer-modified-p buffer-modified-p) + (- (point-max) (point-min)))))) + +(defun kannada-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 kannada-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)))))))) + +(defun kannada-regexp-of-hashtbl-vals (hashtbl) + "Return a regular expression that matches all values in hashtable HASHTBL." + (let ((max-specpdl-size 1000)) + (regexp-opt + (sort + (let (dummy) + (maphash (function (lambda (key val) (setq dummy (cons val dummy)))) hashtbl) + dummy) + (function (lambda (x y) (> (length x) (length y)))))))) + +;;;###autoload +(defun kannada-composition-function (pos &optional string) + "Compose Kannada characters after the position POS. +If STRING is not nil, it is a string, and POS is an index to the string. +In this case, compose characters after POS of the string." + (if string + ;; Not yet implemented. + nil + (goto-char pos) + (if (looking-at kannada-composable-pattern) + (prog1 (match-end 0) + (kannada-compose-syllable-region pos (match-end 0)))))) + +;; Notes on conversion steps. + +;; 1. chars to glyphs +;; +;; Rules will not be applied to the virama appeared at the end of the +;; text. Also, the preceding/following "r" will be treated as special case. + +;; 2. glyphs reordering. +;; +;; The glyphs are split by virama, and each glyph groups are +;; re-ordered in the following order. +;; +;; Note that `consonant-glyph' mentioned here does not contain the +;; vertical bar (right modifier) attached at the right of the +;; consonant. +;; +;; If the glyph-group contains right modifier, +;; (1) consonant-glyphs/vowels +;; (2) spacing +;; (3) right modifier (may be matra) +;; (4) top matra +;; (5) preceding "r" +;; (7) following "r" +;; (8) bottom matra or virama. +;; +;; Otherwise, +;; (1) consonant-glyph/vowels, with nukta sign +;; (3) left matra +;; (4) top matra +;; (5) preceding "r" +;; (7) following "r" +;; (8) bottom matra or virama. +;; (2) spacing + +;; 3. glyph to glyph +;; +;; For better display, some glyph display would be tuned. + +;; 4. Composition. +;; +;; left modifiers will be attached at the left. +;; others will be attached right. + +;; Problem:: +;; Can we generalize this methods to other Indian scripts? + +(defvar knd-char-glyph + '(("$,1>e(B" . "$,43@(B") + ("$,1>f(B" . "$,43A(B") + ("$,1?>(B" . "$,44{(B") + ("$,1>g(B" . "$,43B(B") + ("$,1??(B" . nil) + ("$,1>h(B" . "$,43C(B") + ("$,1?@(B" . nil) + ("$,1>i(B" . "$,43D(B") + ("$,1?A(B" . "\$,44(B") + ("$,1>j(B" . "$,43E(B") + ("$,1?B(B" . "\$,45 (B") + ("$,1>k(B" . "$,43F4(B") + ("$,1?C(B" . "\$,45$(B") + ("$,1?`(B" . "$,43F5 (B") + ("$,1?D(B" . "\$,45%(B") + ;;("$,1>l(B" . nil) ; not implemented. + ;;("$,1?a(B" . nil) + ("$,1>n(B" . "$,43G(B") + ("$,1>o(B" . "$,43H(B") + ("$,1>p(B" . "$,43I(B") + ("$,1?F(B" . "\$,45&(B") + ("$,1?G(B" . "\$,45&4~(B") + ("$,1?H(B" . "\$,45&5'(B") + ("$,1>r(B" . "$,43J(B") + ("$,1?J(B" . "$,45&5 (B") + ("$,1>s(B" . "$,43K(B") + ("$,1?K(B" . "\$,45&5 4~(B") + ("$,1>t(B" . "$,43L(B") + ("$,1?L(B" . "\$,45((B") + ("$,1>b(B" . "$,43M(B") + ("$,1>c(B" . "$,43N(B") + ("$,1>u?M(B" . "$,43O5)(B") ("$,1>u(B" . "$,43O(B") ("$,1>u??(B" . "$,43P(B") ("$,1>u?@(B" . "$,43P4~(B") + ("$,1>v?M(B" . "$,43S5)(B") ("$,1>v(B" . "$,43S(B") ("$,1>v??(B" . "$,43T(B") ("$,1>v?@(B" . "$,43T4~(B") ("$,1>v?F(B" . "$,43S5&(B") ("$,1>v?G(B" . "$,43S5&4~(B") ("$,1>v?H(B" . "$,43S5&5'(B") ("$,1>v?J(B" . "$,43S5&5&5 (B") ("$,1>v?K(B" . "$,43S5&5&5 4~(B") ("$,1>v?L(B" . "$,43S5((B") + ("$,1>w?M(B" . "$,43V5)(B") ("$,1>w(B" . "$,43V(B") ("$,1>w??(B" . "$,43W(B") ("$,1>w?@(B" . "$,43W4~(B") + ("$,1>x?M(B" . "$,43Y5)(B") ("$,1>x(B" . "$,43Y(B") ("$,1>x??(B" . "$,43Z(B") ("$,1>x?@(B" . "$,43Z4~(B") + ("$,1>y?M(B" . "$,43\5)(B") ("$,1>y(B" . "$,43\(B") + ("$,1>z?M(B" . "$,43^5)(B") ("$,1>z(B" . "$,43^(B") ("$,1>z??(B" . "$,43_(B") ("$,1>z?@(B" . "$,43_4~(B") + ("$,1>{?M(B" . "$,43a5)(B") ("$,1>{(B" . "$,43a(B") ("$,1>{??(B" . "$,43b(B") ("$,1>{?@(B" . "$,43b4~(B") + ("$,1>|?M(B" . "$,43d5)(B") ("$,1>|(B" . "$,43d(B") ("$,1>|??(B" . "$,43f(B") ("$,1>|?@(B" . "$,43f4~(B") ("$,1>|?F(B" . "$,43e5&(B") ("$,1>|?G(B" . "$,43e5&4~(B") ("$,1>|?H(B" . "$,43e5&5'(B") ("$,1>|?J(B" . "$,43e5&5&5 (B") ("$,1>|?K(B" . "$,43e5&5&5 4~(B") ("$,1>|?L(B" . "$,43e5((B") + ("$,1>}?M(B" . "$,44a4z3h45)(B") ("$,1>}(B" . "$,44a4z3h4(B") ("$,1>}??(B" . "$,44b3h4(B") ("$,1>}?@(B" . "$,44b3h44~(B") ("$,1>}?B(B". "$,44a4z3h5 (B") ("$,1>}?J(B". "$,44a5&3h5 (B") ("$,1>}?K(B". "$,44a5&3h5 4~(B") + ("$,1>~?M(B" . "$,43j5)(B") ("$,1>~(B" . "$,43j(B") + ("$,1>?M(B" . "$,43m5)(B") ("$,1>(B" . "$,43l(B") ("$,1?#?>(B" . "$,43m4{(B") ("$,1>??(B" . "$,43n(B") ("$,1>?@(B" . "$,43n4~(B") ("$,1>?F(B" . "$,43m5&(B") ("$,1>?G(B" . "$,43m5&4~(B") ("$,1>?H(B" . "$,43m5&5'(B") ("$,1>?J(B" . "$,43m5&5&5 (B") ("$,1>?K(B" . "$,43m5&5&5 4~(B") ("$,1>?L(B" . "$,43m5((B") + ("$,1? ?M(B" . "$,43p5)(B") ("$,1? (B" . "$,43p(B") ("$,1? ??(B" . "$,43q(B") ("$,1? ?@(B" . "$,43q4~(B") + ("$,1?!?M(B" . "$,43s5)(B") ("$,1?!(B" . "$,43s(B") ("$,1?!??(B" . "$,43t(B") ("$,1?!?@(B" . "$,43t4~(B") + ("$,1?"?M(B" . "$,43v5)(B") ("$,1?"(B" . "$,43v(B") ("$,1?"??(B" . "$,43w(B") ("$,1?"?@(B" . "$,43w4~(B") + ("$,1?#?M(B" . "$,43z5)(B") ("$,1?#(B" . "$,43y(B") ("$,1?#?>(B" . "$,43z4{(B") ("$,1?#??(B" . "$,43{(B") ("$,1?#?@(B" . "$,43{4~(B") ("$,1?#?F(B" . "$,43z5&(B") ("$,1?#?G(B" . "$,43z5&4~(B") ("$,1?#?H(B" . "$,43z5&5'(B") ("$,1?#?J(B" . "$,43z5&5&5 (B") ("$,1?#?K(B" . "$,43z5&5&5 4~(B") ("$,1?#?L(B" . "$,43z5((B") + ("$,1?$?M(B" . "$,43}5)(B") ("$,1?$(B" . "$,43}(B") ("$,1?$??(B" . "$,43~(B") ("$,1?$?@(B" . "$,43~4~(B") + ("$,1?%?M(B" . "$,44B5)(B") ("$,1?%(B" . "$,44B(B") ("$,1?%??(B" . "$,44C(B") ("$,1?%?@(B" . "$,44C4~(B") + ("$,1?&?M(B" . "$,44E5)(B") ("$,1?&(B" . "$,44E(B") ("$,1?&??(B" . "$,44F(B") ("$,1?&?@(B" . "$,44F4~(B") + ("$,1?'?M(B" . "$,44H5)(B") ("$,1?'(B" . "$,44H(B") ("$,1?'??(B" . "$,44I(B") ("$,1?'?@(B" . "$,44I4~(B") + ("$,1?(?M(B" . "$,44K5)(B") ("$,1?((B" . "$,44K(B") ("$,1?(??(B" . "$,44L(B") ("$,1?(?@(B" . "$,44L4~(B") + ("$,1?*?M(B" . "$,44N5)(B") ("$,1?*(B" . "$,44N(B") ("$,1?*??(B" . "$,44O(B") ("$,1?*?@(B" . "$,44O4~(B") ("$,1?*?A(B" . "$,44N5"(B") ("$,1?*?B(B" . "$,44N5#(B") ("$,1?*?J(B" . "$,44N5&5#(B") ("$,1?*?K(B" . "$,44N5&5#4~(B") + ("$,1?+?M(B" . "$,44Q5)(B") ("$,1?+(B" . "$,44Q(B") ("$,1?+??(B" . "$,44R(B") ("$,1?+?@(B" . "$,44R4~(B") ("$,1?+?A(B" . "$,44Q5"(B") ("$,1?+?B(B" . "$,44Q5#(B") ("$,1?+?J(B" . "$,44Q5&5#(B") ("$,1?+?K(B" . "$,44Q5&5#4~(B") + ("$,1?,?M(B" . "$,44W5)(B") ("$,1?,(B" . "$,44V(B") ("$,1?,?>(B". "$,44W4{(B") ("$,1?,??(B" . "$,44X(B") ("$,1?,?@(B" . "$,44X4~(B") ("$,1?,?F(B" . "$,44W5&(B") ("$,1?,?G(B" . "$,44W5&4~(B") ("$,1?,?H(B" . "$,44W5&5'(B") ("$,1?,?J(B" . "$,44W5&5&5 (B") ("$,1?,?K(B" . "$,44W5&5&5 4~(B") ("$,1?,?L(B" . "$,44W5((B") + ("$,1?-?M(B" . "$,44Z5)(B") ("$,1?-(B" . "$,44Z(B") ("$,1?-??(B" . "$,44[(B") ("$,1?-?@(B" . "$,44[4~(B") + ("$,1?.?M(B" . "$,44h5!5)(B") ("$,1?.(B" . "$,44h4z4(B") ("$,1?.?>(B" . "$,44h4z5!4{(B") ("$,1?.??(B" . "$,44i4(B") ("$,1?.?@(B" . "$,44i44~(B") ("$,1?.?J(B". "$,44h5&5 (B") ("$,1?.?K(B". "$,44h5&5 4~(B") + ("$,1?/?M(B" . "$,44^4z5!5)(B") ("$,1?/(B" . "$,44^4z4(B") ("$,1?/?>(B" . "$,44^4z5!4{(B")("$,1?/??(B" . "$,44_4(B") ("$,1?/?@(B" . "$,44_44~(B") ("$,1?/?J(B" . "$,44^5&5 (B") ("$,1?/?K(B" . "$,44^5&5 4~(B") + ("$,1?0?M(B" . "$,44a5)(B") ("$,1?0(B" . "$,44a(B") ("$,1?0??(B" . "$,44b(B") ("$,1?0?@(B" . "$,44b4~(B") + ("$,1?0?M(B" . "$,44a5)(B") ("$,1?0(B" . "$,44a(B") ("$,1?0??(B" . "$,44b(B") ("$,1?0?@(B" . "$,44b4~(B") + ("$,1?2?M(B" . "$,44e5)(B") ("$,1?2(B" . "$,44d(B") ("$,1?2?>(B" . "$,44e4{(B") ("$,1?2??(B" . "$,44f(B") ("$,1?2?@(B" . "$,44f4~(B") ("$,1?2?F(B" . "$,44e5&(B") ("$,1?2?G(B" . "$,44e5&4~(B") ("$,1?2?H(B" . "$,44e5&5'(B") ("$,1?2?J(B" . "$,44e5&5&5 (B") ("$,1?2?K(B" . "$,44e5&5&5 4~(B") ("$,1?2?L(B" . "$,44e5((B") + ("$,1?5?M(B" . "$,44h5)(B") ("$,1?5(B" . "$,44h(B") ("$,1?5??(B" . "$,44i(B") ("$,1?5?@(B" . "$,44i4~(B") ("$,1?5?A(B" . "$,44h5"(B") ("$,1?5?B(B" . "$,44h5#(B") ("$,1?5?J(B" . "$,44h5&5#(B") ("$,1?5?K(B" . "$,44h5&5#4~(B") + ("$,1?6?M(B" . "$,44k5)(B") ("$,1?6(B" . "$,44k(B") ("$,1?6??(B" . "$,44l(B") ("$,1?6?@(B" . "$,44l4~(B") + ("$,1?7?M(B" . "$,44n5)(B") ("$,1?7(B" . "$,44n(B") ("$,1?7??(B" . "$,44o(B") ("$,1?7?@(B" . "$,44o4~(B") + ("$,1?8?M(B" . "$,44q5)(B") ("$,1?8(B" . "$,44q(B") ("$,1?8??(B" . "$,44r(B") ("$,1?8?@(B" . "$,44r4~(B") + ("$,1?9?M(B" . "$,44t5)(B") ("$,1?9(B" . "$,44t(B") ("$,1?9??(B" . "$,44u(B") ("$,1?9?@(B" . "$,44u4~(B") + ("$,1?3?M(B" . "$,44w5)(B") ("$,1?3(B" . "$,44w(B") ("$,1?3??(B" . "$,44x(B") ("$,1?3?@(B" . "$,44x4~(B")) +"Kannada characters to glyphs conversion table. +Default value contains only the basic rules.") + +(defvar knd-char-glyph-hash + (let* ((hash (make-hash-table :test 'equal))) + (mapc (function (lambda (x) (puthash (car x) (cdr x) hash))) + knd-char-glyph) + hash)) + +(defvar knd-char-glyph-regexp + (kannada-regexp-of-hashtbl-keys knd-char-glyph-hash)) + +(defvar knd-conjunct-glyph + '(("$,1>u(B" . "$,43Q(B") ("$,1>v(B" . "$,43U(B") ("$,1>w(B" . "$,43X(B") ("$,1>x(B" . "$,43[(B") ("$,1>y(B" . "$,43](B") + ("$,1>z(B" . "$,43`(B") ("$,1>{(B" . "$,43c(B") ("$,1>|(B" . "$,43g(B") ("$,1>}(B" . "$,43i(B") ("$,1>~(B" . "$,43k(B") + ("$,1>(B" . "$,43o(B") ("$,1? (B" . "$,43r(B") ("$,1?!(B" . "$,43u(B") ("$,1?"(B" . "$,43x(B") ("$,1?#(B" . "$,43|(B") + ("$,1?$(B" . "$,44A(B") ("$,1?%(B" . "$,44D(B") ("$,1?&(B" . "$,44G(B") ("$,1?'(B" . "$,44J(B") ("$,1?((B" . "$,44M(B") + ("$,1?*(B" . "$,44P(B") ("$,1?+(B" . "$,44U(B") ("$,1?,(B" . "$,44Y(B") ("$,1?-(B" . "$,44\(B") ("$,1?.(B" . "$,44](B") + ("$,1?/(B" . "$,44`(B") ("$,1?0(B" . "$,44c(B") ("$,1?2(B" . "$,44g(B") ("$,1?3(B" . "$,44y(B") ("$,1?5(B" . "$,44j(B") + ("$,1?6(B" . "$,44m(B") ("$,1?7(B" . "$,44p(B") ("$,1?8(B" . "$,44s(B") ("$,1?9(B" . "$,44v(B")) +"Kannada characters to conjunct glyphs conversion table.") + +(defvar knd-conjunct-glyph-hash + (let* ((hash (make-hash-table :test 'equal))) + (mapc (function (lambda (x) (puthash (car x) (cdr x) hash))) + knd-conjunct-glyph) + hash)) + +(defvar knd-conjunct-glyph-regexp + (kannada-regexp-of-hashtbl-vals knd-conjunct-glyph-hash)) + +(mapc + (function (lambda (x) + (put-char-code-property (aref (cdr x) 0) 'reference-point '(5 . 3)))) + knd-conjunct-glyph) + +;; glyph-to-glyph conversion table. +;; it is supposed that glyphs are ordered in +;; [consonant/nukta] - [matra/virama] - [preceding-r] - [anuswar]. + +(defvar knd-glyph-glyph + '(("$,45$4A(B" . "$,45*(B") + ("$,45'4A(B" . "$,45+(B") + ("$,44A3g(B" . "$,45,(B") + ("$,45$3Q(B" . "$,45-(B"))) + +(defvar knd-glyph-glyph-hash + (let* ((hash (make-hash-table :test 'equal))) + (mapc (function (lambda (x) (puthash (car x) (cdr x) hash))) + knd-glyph-glyph) + hash)) +(defvar knd-glyph-glyph-regexp + (kannada-regexp-of-hashtbl-keys knd-glyph-glyph-hash)) + +(defun knd-charseq (from &optional to) + (if (null to) (setq to from)) + (number-sequence (decode-char 'kannada-cdac from) + (decode-char 'kannada-cdac to))) + +(defvar knd-glyph-cv + (append + (knd-charseq #x40 #x50) + (knd-charseq #x52 #x54) + (knd-charseq #x56 #x57) + (knd-charseq #x59 #x5a) + (knd-charseq #x5c) + (knd-charseq #x5e #x5f) + (knd-charseq #x61 #x62) + (knd-charseq #x64 #x66) + (knd-charseq #x6a) + (knd-charseq #x6c #x6e) + (knd-charseq #x70 #x71) + (knd-charseq #x73 #x74) + (knd-charseq #x76 #x77) + (knd-charseq #x79 #x7b) + (knd-charseq #x7d #x7e) + (knd-charseq #xa2 #xa3) + (knd-charseq #xa5 #xa6) + (knd-charseq #xa8 #xa9) + (knd-charseq #xab #xac) + (knd-charseq #xae #xaf) + (knd-charseq #xb1 #xb2) + (knd-charseq #xb6 #xb8) + (knd-charseq #xb6 #xb8) + (knd-charseq #xba #xbb) + (knd-charseq #xbe #xbf) + (knd-charseq #xc1 #xc2) + (knd-charseq #xc4 #xc6) + (knd-charseq #xc8 #xc9) + (knd-charseq #xcb #xcc) + (knd-charseq #xce #xcf) + (knd-charseq #xd1 #xd2) + (knd-charseq #xd4 #xd5) + (knd-charseq #xd7 #xd8) + (knd-charseq #xc3)) + "Kannada Consonants/Vowels/Nukta Glyphs") + +(defvar knd-glyph-space + (knd-charseq #xb3 #xb4) + "Kannada Spacing Glyphs") + +(defvar knd-glyph-right-modifier + (append + (knd-charseq #xdb #xdd) + (knd-charseq #xdf) + (knd-charseq #xe0 #xe3) + (knd-charseq #xe9)) + "Kannada Modifiers attached at the right side.") + +(defvar knd-glyph-right-modifier-regexp + (concat "[" knd-glyph-right-modifier "]")) + +(defvar knd-glyph-jha-tail + (knd-charseq #x68) + "Kannada tail for jha.") + +(defvar knd-glyph-top-matra + (append + (knd-charseq #xda) + (knd-charseq #xdd) + (knd-charseq #xe6) + (knd-charseq #xe8)) + "Kannada Matras attached at the top side.") + +(defvar knd-glyph-bottom-matra + (append + (knd-charseq #xe4 #xe5) + (knd-charseq #xe7)) + "Kannada Matras attached at the bottom.") + +(defvar knd-glyph-end-marks + (append + (knd-charseq #x25) + (knd-charseq #x4d #x4e) + (knd-charseq #xde)) + "Kannada end marks: arkavattu, virama, au and diirghaa.") + +(defvar knd-glyph-bottom-modifier + (append + (knd-charseq #x51) + (knd-charseq #x55) + (knd-charseq #x58) + (knd-charseq #x5b) + (knd-charseq #x5d) + (knd-charseq #x60) + (knd-charseq #x63) + (knd-charseq #x67) + (knd-charseq #x69) + (knd-charseq #x6b) + (knd-charseq #x6f) + (knd-charseq #x72) + (knd-charseq #x75) + (knd-charseq #x78) + (knd-charseq #x7c) + (knd-charseq #xa1) + (knd-charseq #xa4) + (knd-charseq #xa7) + (knd-charseq #xaa) + (knd-charseq #xad) + (knd-charseq #xb0) + (knd-charseq #xb5) + (knd-charseq #xb9) + (knd-charseq #xbc #xbd) + (knd-charseq #xc0) + (knd-charseq #xc3) + (knd-charseq #xc7) + (knd-charseq #xca) + (knd-charseq #xcd) + (knd-charseq #xd0) + (knd-charseq #xd3) + (knd-charseq #xd6) + (knd-charseq #xd9) + (knd-charseq #xea #xef)) + "Kannada Modifiers attached at the bottom.") + +(defvar knd-glyph-order + `((,knd-glyph-cv . 1) + (,knd-glyph-top-matra . 2) + (,knd-glyph-jha-tail . 3) + (,knd-glyph-right-modifier . 4) + (,knd-glyph-space . 5) + (,knd-glyph-bottom-modifier . 5) + (,knd-glyph-bottom-matra . 6) + (,knd-glyph-end-marks . 7) + )) + +(mapc + (function (lambda (x) + (mapc + (function (lambda (y) + (put-char-code-property y 'composition-order (cdr x)))) + (car x)))) + knd-glyph-order) + +(defun kannada-compose-syllable-string (string) + (with-temp-buffer + (insert (decompose-string string)) + (kannada-compose-syllable-region (point-min) (point-max)) + (buffer-string))) + +;; kch +(defun kannada-compose-syllable-region (from to) + "Compose kannada syllable in region FROM to TO." + (let ((glyph-str nil) (cons-num 0) (glyph-str-list nil) + (last-virama nil) (preceding-r nil) (last-modifier nil) + (last-char (char-before to)) match-str pos + glyph-block split-pos (conj nil) (rest nil)) + (save-excursion + (save-restriction + ;;; *** char-to-glyph conversion *** + ;; Special rule 1. -- Last virama must be preserved. + (if (eq last-char ?$,1?M(B) + (progn + (setq last-virama t) + (narrow-to-region from (1- to))) + (narrow-to-region from to)) + (goto-char (point-min)) + ;; Special rule 2. -- preceding "r virama" must be modifier. + (when (looking-at "$,1?0?M(B.") + (setq preceding-r t) + (goto-char (+ 2 (point)))) + ;; remove conjunct consonants + (while (re-search-forward knd-char-glyph-regexp nil t) + (setq match-str (match-string 0)) + (if (and (string-match kannada-consonant match-str) + (> cons-num 0)) + (progn + (setq conj (concat conj (gethash (match-string 0 match-str) + knd-conjunct-glyph-hash))) + (setq match-str (replace-match "" t nil match-str)) + (if (string-match "$,1?M(B" rest) + (setq rest (replace-match "" t nil rest))))) + (setq rest (concat rest match-str)) + ;; count the number of consonant-glyhs. + (if (string-match kannada-consonant match-str) + (setq cons-num (1+ cons-num)))) + ;; translate the rest characters into glyphs + (setq pos 0) + (while (string-match knd-char-glyph-regexp rest pos) + (setq match-str (match-string 0 rest)) + (setq pos (match-end 0)) + (setq glyph-str + (concat glyph-str (gethash match-str knd-char-glyph-hash)))) + + (if conj (setq glyph-str (concat glyph-str conj))) + (if last-virama (setq glyph-str (concat glyph-str "$,45)(B")) + (goto-char (point-min)) + (if (re-search-forward kannada-consonant-needs-twirl nil t) + (progn + (setq match-str (match-string 0)) + (setq glyph-str (concat glyph-str "$,44z(B"))))) + ;; preceding-r must be attached + (if preceding-r + (setq glyph-str (concat glyph-str "$,43%(B"))) + ;;; *** glyph-to-glyph conversion *** + (when (string-match knd-glyph-glyph-regexp glyph-str) + (setq glyph-str + (replace-match (gethash (match-string 0 glyph-str) + knd-glyph-glyph-hash) + nil t glyph-str))) + ;;; *** glyph reordering *** + (while (setq split-pos (string-match "$,45)(B\\|.$" glyph-str)) + (setq glyph-block (substring glyph-str 0 (1+ split-pos))) + (setq glyph-str (substring glyph-str (1+ split-pos))) + (setq + glyph-block + (sort (string-to-list glyph-block) + (function (lambda (x y) + (< (get-char-code-property x 'composition-order) + (get-char-code-property y 'composition-order)))))) + (setq glyph-str-list (nconc glyph-str-list glyph-block))) + ;;; *** insert space glyphs for kerning *** + (if (> cons-num 0) + (let ((curr glyph-str-list) (prev nil) (last-bott nil) bott co) + (while curr + (setq co (get-char-code-property + (car curr) 'composition-order) + bott (or (eq co 5) (eq co 6))) + (if (and bott last-bott) + (setcdr prev (cons ?$,44T(B curr))) + (setq last-bott bott prev curr curr (cdr curr))))) + ;; concatenate and attach reference-points. + (setq glyph-str + (cdr + (apply + 'nconc + (mapcar + (function (lambda (x) + (list + (or (get-char-code-property x 'reference-point) + '(5 . 3) ;; default reference point. + ) + x))) + glyph-str-list)))))) + (compose-region from to glyph-str))) + +(provide 'knd-util) + +;;; arch-tag: 78d32230-a960-46a5-b622-61ed6ffcf8fc +;;; knd-util.el ends here |