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emacs/lisp/language/mlm-util.el
Kenichi Handa fd19b75d04 (malayalam-composition-function): Use 
font-shape-text if auto-compose-current-font is non-nil.
2007-12-06 07:33:02 +00:00

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;;; mlm-util.el --- support for composing malayalam characters -*-coding: iso-2022-7bit;-*-
;; Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
;; Maintainer: KAWABATA, Taichi <kawabata@m17n.org>
;; Keywords: multilingual, Malayalam
;; 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 3, 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: Feb. 11. 2003
;;; Commentary:
;; This file provides character(Unicode) to glyph(CDAC) conversion and
;; composition of Malayalam script characters.
;;; Code:
;; Malayalam Composable Pattern
;; C .. Consonants
;; V .. Vowel
;; H .. Halant
;; M .. Matra
;; V .. Vowel
;; A .. Anuswar
;; D .. Chandrabindu
;; (N .. Zerowidth Non Joiner)
;; (J .. Zerowidth Joiner. )
;; 1. vowel
;; V(A|visargam)?
;; 2. syllable : maximum of 5 consecutive consonants. (e.g. kartsnya)
;; ((CH)?(CH)?(CH)?CH)?C(H|M?(A|D)?)?
(defconst malayalam-consonant
"[$,1@5(B-$,1@Y(B]")
(defconst malayalam-composable-pattern
(concat
"\\([$,1@%(B-$,1@4(B][$,1@"(B]?\\)\\|$,1@#(B"
"\\|\\("
"\\(?:\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?[$,1@5(B-$,1@Y(B]$,1@m(B\\)?"
"[$,1@5(B-$,1@Y(B]\\(?:$,1@m(B\\|[$,1@^(B-$,1@c@f@g@h@j@j@k@l(B]?[$,1@"@m(B]?\\)?"
"\\)")
"Regexp matching a composable sequence of Malayalam characters.")
;;;###autoload
(defun malayalam-compose-region (from to)
(interactive "r")
(save-excursion
(save-restriction
(narrow-to-region from to)
(goto-char (point-min))
(while (re-search-forward malayalam-composable-pattern nil t)
(malayalam-compose-syllable-region (match-beginning 0)
(match-end 0))))))
(defun malayalam-compose-string (string)
(with-temp-buffer
(insert (decompose-string string))
(malayalam-compose-region (point-min) (point-max))
(buffer-string)))
;;;###autoload
(defun malayalam-post-read-conversion (len)
(save-excursion
(save-restriction
(let ((buffer-modified-p (buffer-modified-p)))
(narrow-to-region (point) (+ (point) len))
(malayalam-compose-region (point-min) (point-max))
(set-buffer-modified-p buffer-modified-p)
(- (point-max) (point-min))))))
(defun malayalam-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 malayalam-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 malayalam-composition-function (pos &optional string)
"Compose Malayalam 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
(if auto-compose-current-font
(if (eq (string-match "[$,1@ (B-$,1A?(B]+" pos) pos)
(or (font-shape-text 0 (match-end 0) auto-compose-current-font
string)
pos)))
(goto-char pos)
(if auto-compose-current-font
(if (looking-at "[$,1@ (B-$,1A?(B]+")
(or (font-shape-text pos (match-end 0) auto-compose-current-font)
pos)
(if (looking-at malayalam-composable-pattern)
(prog1 (match-end 0)
(malayalam-compose-syllable-region pos (match-end 0))))))))
;; Notes on conversion steps.
;; 1. chars to glyphs
;;
;; Simple replacement of characters to glyphs is done.
;; 2. glyphs reordering.
;;
;; Two special reordering rule takes place.
;; a. following "$,46[(B" goes to the front.
;; b. following "$,46S6S(B", "$,46S(B" or "$,46T(B" goes to the front.
;; This reordering occurs only to the last cluster of consonants.
;; Preceding consonants with halant characters are not affected.
;; 3. Composition.
;;
;; left modifiers will be attached at the left.
;; others will be attached right.
(defvar mlm-char-glyph
'(;; various signs
("$,1@"(B" . "$,46W(B")
("$,1@#(B" . "$,46X(B")
;; Independent Vowels
("$,1@%(B" . "$,46!(B")
("$,1@&(B" . "$,46"(B")
("$,1@'(B" . "$,46#(B")
("$,1@((B" . "$,46#6U(B")
("$,1@)(B" . "$,46$(B")
("$,1@*(B" . "$,46$6U(B")
("$,1@+(B" . "$,46%(B")
("$,1@,(B" . "nil") ;; not in present use, not supported.
("$,1@.(B" . "$,46&(B")
("$,1@/(B" . "$,46'(B")
("$,1@0(B" . "$,46S6&(B")
("$,1@2(B" . "$,46((B")
("$,1@3(B" . "$,46(6M(B")
("$,1@4(B" . "$,46(6U(B")
;; Consonants
("$,1@5(B" . "$,46)(B")
("$,1@5@m@5(B" . "$,47!(B")
("$,1@5@m@S(B" . "$,47"(B")
("$,1@5@m@W(B" . "$,47#(B")
("$,1@5@m@?(B" . "$,47N(B")
("$,1@5@m@D(B" . "$,47`(B")
("$,1@5@a(B" . "$,47f(B")
("$,1@5@m@5@a(B" . "$,47g(B")
("$,1@5@a(B" . "$,47f(B")
("$,1@5@m@5@a(B" . "$,47g(B")
("$,1@6(B" . "$,46*(B")
("$,1@7(B" . "$,46+(B")
("$,1@7@m@7(B" . "$,47$(B")
("$,1@7@m@R(B" . "$,47%(B")
("$,1@7@m@N(B" . "$,47\(B")
("$,1@7@m@H(B" . "$,47a(B")
("$,1@8(B" . "$,46,(B")
("$,1@9(B" . "$,46-(B")
("$,1@9@m@5(B" . "$,47&(B")
("$,1@9@m@9(B" . "$,47'(B")
("$,1@9@m@5@a(B" . "$,47h(B")
("$,1@:(B" . "$,46.(B")
("$,1@:@m@:(B" . "$,47((B") ;; duplicate
("$,1@:@m@;(B" . "$,47Q(B")
("$,1@;(B" . "$,46/(B")
("$,1@<(B" . "$,460(B")
("$,1@<@m@<(B" . "$,47V(B")
("$,1@<@m@>(B" . "$,47Z(B")
("$,1@=(B" . "$,461(B")
("$,1@>(B" . "$,462(B")
("$,1@>@m@:(B" . "$,47)(B")
("$,1@>@m@>(B" . "$,47*(B")
("$,1@?(B" . "$,463(B")
("$,1@?@m@?(B" . "$,47+(B")
("$,1@@(B" . "$,464(B")
("$,1@A(B" . "$,465(B")
("$,1@A@m@A(B" . "$,47M(B")
("$,1@B(B" . "$,466(B")
("$,1@C(B" . "$,467(B")
("$,1@C@a@m(B" . "$,47,(B") ;; half consonant
("$,1@C@m@?(B" . "$,47-(B")
("$,1@C@m@C(B" . "$,47.(B")
("$,1@C@m@N(B" . "$,47W(B")
("$,1@C@m@A(B" . "$,47^(B")
("$,1@C@a(B" . "$,47i(B")
("$,1@D(B" . "$,468(B")
("$,1@D@m@D(B" . "$,47/(B")
("$,1@D@m@E(B" . "$,470(B")
("$,1@D@m@X(B" . "$,47U(B")
("$,1@D@m@M(B" . "$,47[(B")
("$,1@D@m@N(B" . "$,47_(B")
("$,1@E(B" . "$,469(B")
("$,1@F(B" . "$,46:(B")
("$,1@F@m@F(B" . "$,471(B")
("$,1@F@m@G(B" . "$,472(B")
("$,1@G(B" . "$,46;(B")
("$,1@H(B" . "$,46<(B")
("$,1@H@a@m(B" . "$,473(B") ;; half consonant
("$,1@H@m@D(B" . "$,474(B")
("$,1@H@m@F(B" . "$,475(B")
("$,1@H@m@H(B" . "$,476(B")
("$,1@H@m@N(B" . "$,477(B")
("$,1@H@m@G(B" . "$,47T(B")
("$,1@H@m@E(B" . "$,47Y(B")
("$,1@H@m@Q(B" . "$,47b(B")
("$,1@H@a(B" . "$,47k(B")
("$,1@H@m@H@a(B" . "$,47l(B")
("$,1@J(B" . "$,46=(B")
("$,1@J@m@J(B" . "$,478(B") ;; duplicate
("$,1@J@m@R(B" . "$,479(B") ;; lakar
("$,1@K(B" . "$,46>(B")
("$,1@L(B" . "$,46?(B")
("$,1@L@m@L(B" . "$,47:(B") ;; duplicate
("$,1@L@m@R(B" . "$,47;(B") ;; lakar
("$,1@L@m@G(B" . "$,47O(B")
("$,1@L@m@F(B" . "$,47P(B")
("$,1@M(B" . "$,46@(B")
("$,1@N(B" . "$,46A(B")
("$,1@N@m@J(B" . "$,47<(B")
("$,1@N@m@N(B" . "$,47=(B")
("$,1@N@m@R(B" . "$,47>(B") ;; lakar
("$,1@O(B" . "$,46B(B")
("$,1@O@m@O(B" . "$,47?(B") ;; duplicate
("$,1@O@m@5@m@5(B" . "$,47m(B")
("$,1@P(B" . "$,46C(B")
("$,1@P@a@m(B" . "$,47@(B")
("$,1@P@a(B" . "$,47j(B")
("$,1@Q(B" . "$,46D(B")
("$,1@Q@m(B" . "$,47@(B") ;; same glyph as "$,1@P@m(B"
("$,1@Q@a@m(B" . "$,47@(B") ;; same glyph as "$,1@P@m(B"
;;("$,1@Q@m@Q(B" . "$,47A(B")
("$,1@Q@m@Q(B" . "$,47d(B")
("$,1@R(B" . "$,46E(B")
("$,1@R@a@m(B" . "$,47B(B")
("$,1@R@m@R(B" . "$,47C(B") ;; lakar
("$,1@R@m@J(B" . "$,47e(B")
("$,1@S(B" . "$,46F(B")
("$,1@S@a@m(B" . "$,47D(B")
("$,1@S@m@S(B" . "$,47E(B")
("$,1@T(B" . "$,46G(B")
("$,1@U(B" . "$,46H(B")
("$,1@U@m@U(B" . "$,47F(B")
("$,1@V(B" . "$,46I(B")
("$,1@V@m@R(B" . "$,47G(B")
("$,1@V@m@V(B" . "$,47H(B")
("$,1@V@m@:(B" . "$,47](B")
("$,1@W(B" . "$,46J(B")
("$,1@W@m@?(B" . "$,47c(B")
("$,1@X(B" . "$,46K(B")
("$,1@X@m@R(B" . "$,47I(B")
("$,1@X@m@X(B" . "$,47J(B")
("$,1@X@m@Q@m@Q(B" . "$,47L(B")
("$,1@X@m@E(B" . "$,47X(B")
("$,1@Y(B" . "$,46L(B")
("$,1@Y@m@R(B" . "$,47K(B")
("$,1@Y@m@N(B" . "$,47R(B")
("$,1@Y@m@H(B" . "$,47S(B")
;; Dependent vowel signs
("$,1@^(B" . "$,46M(B")
("$,1@_(B" . "$,46N(B")
("$,1@`(B" . "$,46O(B")
("$,1@a(B" . "$,46P(B")
("$,1@b(B" . "$,46Q(B")
("$,1@c(B" . "$,46R(B")
("$,1@f(B" . "$,46S(B")
("$,1@g(B" . "$,46T(B")
("$,1@h(B" . "$,46S6S(B")
("$,1@j(B" . "$,46S6M(B")
("$,1@k(B" . "$,46T6M(B")
("$,1@l(B" . "$,46U(B")
;; Various signs
("$,1@m(B" . "$,46V(B")
("$,1@m@O(B" . "$,46Y(B") ;; yakar
("$,1@m@O@a(B" . "$,46\(B") ;; yakar + u
("$,1@m@O@b(B" . "$,46](B") ;; yakar + uu
("$,1@m@U(B" . "$,46Z(B") ;; vakar modifier
("$,1@m@P(B" . "$,46[(B") ;; rakar modifier is the same to rra modifier.
("$,1@m@P@m(B" . "$,46R(B") ;; halant + rakar + halant
("$,1@m@Q(B" . "$,46[(B") ;; rrakar modifier
("$,1@m@Q@m(B" . "$,46R(B") ;; halant + rrakar + halant
("$,1@m@m(B" . "$,46V(B") ;; double omission sign to stop forming half consonant.
("$,1@w(B" . "$,46U(B") ;; not in present use, already at 0D4C.
))
(defvar mlm-char-glyph-hash
(let* ((hash (make-hash-table :test 'equal)))
(mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
mlm-char-glyph)
hash))
(defvar mlm-char-glyph-regexp
(malayalam-regexp-of-hashtbl-keys mlm-char-glyph-hash))
;; Malayalam languages needed to be reordered in a complex mannar.
(defvar mlm-consonants
(concat
"$,46)6*6+6,6-6.6/606162636465666768696:6;6<6=6>6?6@6A6B6C6D6E6F6G6H6I6J6K6L(B"
"$,47!7"7#7$7%7&7'7(7)7*7+7,7-7.7/707172737475767778797:7;7<7=7>7?7@7A7B7C7D7E7F7G7H7I7J7K7L7M7N7O7P7Q7R7S7T7U7V7W7X7Y7Z7[7\7]7^7_7`7a7b7c7d7e(B"
))
(defvar mlm-consonants-regexp
(concat "\\($,46[(B?[" mlm-consonants "][$,46Y6Z(B]?\\)"))
(defvar mlm-glyph-reorder-key-glyphs "[$,46[6S6T(B]")
(defvar mlm-glyph-reordering-regexp-list
`((,(concat "\\([" mlm-consonants "][$,46Y6Z(B]?\\)$,46[(B") . "$,46[(B\\1")
(,(concat mlm-consonants-regexp "$,46S6S(B") . "$,46S6S(B\\1")
(,(concat mlm-consonants-regexp "$,46S(B") . "$,46S(B\\1")
(,(concat mlm-consonants-regexp "$,46T(B") . "$,46T(B\\1")))
(defun malayalam-compose-syllable-string (string)
(with-temp-buffer
(insert (decompose-string string))
(malayalam-compose-syllable-region (point-min) (point-max))
(buffer-string)))
(defun malayalam-compose-syllable-region (from to)
"Compose malayalam syllable in region FROM to TO."
(let (glyph-str
match-str
glyph-reorder-regexps
glyph-reorder-replace
glyph-reorder-regexp)
(save-excursion
(save-restriction
(narrow-to-region from to)
(goto-char (point-min))
;; char-glyph-conversion
(while (not (eobp))
(if (looking-at mlm-char-glyph-regexp)
(progn
(setq match-str (match-string 0)
glyph-str
(concat glyph-str
(gethash match-str mlm-char-glyph-hash)))
(goto-char (match-end 0)))
(setq glyph-str (concat glyph-str (string (following-char))))
(forward-char 1)))
(when (string-match mlm-glyph-reorder-key-glyphs glyph-str)
;; glyph reordering
(setq glyph-reorder-regexps mlm-glyph-reordering-regexp-list)
(while glyph-reorder-regexps
(setq glyph-reorder-regexp (caar glyph-reorder-regexps))
(setq glyph-reorder-replace (cdar glyph-reorder-regexps))
(setq glyph-reorder-regexps (cdr glyph-reorder-regexps))
(if (string-match glyph-reorder-regexp glyph-str)
(setq glyph-str
(replace-match glyph-reorder-replace 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 'mlm-util)
;;; arch-tag: 7f25ee67-8f9d-49f2-837b-35c412c00eba
;;; devan-util.el ends here
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