;;; indian.el --- Indian languages support -*- coding: utf-8; -*-

;; Copyright (C) 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
;;   Free Software Foundation, Inc.
;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H14PRO021

;; Maintainer:  Kenichi Handa <handa@m17n.org>
;;		KAWABATA, Taichi <kawabata@m17n.org>
;; Keywords: 	multilingual, i18n, Indian

;; 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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This file contains definitions of Indian language environments, and
;; setups for displaying the scrtipts used there.

;;; Code:

(define-coding-system 'in-is13194-devanagari
  "8-bit encoding for ASCII (MSB=0) and IS13194-Devanagari (MSB=1)."
  :coding-type 'iso-2022
  :mnemonic ?D
  :designation [ascii indian-is13194 nil nil]
  :charset-list '(ascii indian-is13194)
  :post-read-conversion 'in-is13194-post-read-conversion
  :pre-write-conversion 'in-is13194-pre-write-conversion)

(define-coding-system-alias 'devanagari 'in-is13194-devanagari)

(set-language-info-alist
 "Devanagari" '((charset unicode)
		(coding-system utf-8)
		(coding-priority utf-8)
		(input-method . "dev-aiba")
		(documentation . "\
Such languages using Devanagari script as Hindi and Marathi
are supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Bengali" '((charset unicode)
	     (coding-system utf-8)
	     (coding-priority utf-8)
	     (input-method . "bengali-itrans")
	     (documentation . "\
Such languages using Bengali script as Bengali and Assamese
are supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Punjabi" '((charset unicode)
	      (coding-system utf-8)
	      (coding-priority utf-8)
	      (input-method . "punjabi-itrans")
	      (documentation . "\
North Indian language Punjabi is supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Gujarati" '((charset unicode)
	      (coding-system utf-8)
	      (coding-priority utf-8)
	      (input-method . "gujarati-itrans")
	      (documentation . "\
North Indian language Gujarati is supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Oriya" '((charset unicode)
	      (coding-system utf-8)
	      (coding-priority utf-8)
	      (input-method . "oriya-itrans")
	      (documentation . "\
Such languages using Oriya script as Oriya, Khonti, and Santali
are supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Tamil" '((charset unicode)
	   (coding-system utf-8)
	   (coding-priority utf-8)
	   (input-method . "tamil-itrans")
	   (documentation . "\
South Indian Language Tamil is supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Telugu" '((charset unicode)
	    (coding-system utf-8)
	    (coding-priority utf-8)
	    (input-method . "telugu-itrans")
	    (documentation . "\
South Indian Language Telugu is supported in this language environment."))
 '("Indian"))

(set-language-info-alist
 "Kannada" '((charset unicode)
	     (coding-system mule-utf-8)
	     (coding-priority mule-utf-8)
	     (input-method . "kannada-itrans")
	     (sample-text . "Kannada (ಕನ್ನಡ)	ನಮಸ್ಕಾರ")
	     (documentation . "\
Kannada language and script is supported in this language
environment.")) 
 '("Indian"))

(set-language-info-alist
 "Malayalam" '((charset unicode)
	       (coding-system utf-8)
	       (coding-priority utf-8)
	       (input-method . "malayalam-itrans")
	       (documentation . "\
South Indian language Malayalam is supported in this language environment."))
 '("Indian"))

(defconst devanagari-composable-pattern
  (concat
   "\\([अ-औॠॡ][ँं]?\\)\\|[ः।]"
   "\\|\\("
   "\\(?:\\(?:[क-हक़-य़]्\\)?\\(?:[क-हक़-य़]्\\)?\\(?:[क-हक़-य़]्\\)?[क-हक़-य़]्\\)?"
   "[क-हक़-य़]\\(?:्\\|[ा-्ॢॣ]?[ंँ]?\\)?"
   "\\)")
  "Regexp matching a composable sequence of Devanagari characters.")

(defconst tamil-composable-pattern
  (concat
   "\\([அ-ஔ]\\)\\|"
   "[ஂஃ]\\|" ;; vowel modifier considered independent
   "\\(\\(?:\\(?:க்ஷ\\)\\|[க-ஹ]\\)[்ா-ௌ]?\\)\\|"
   "\\(ஷ்ரீ\\)")
  "Regexp matching a composable sequence of Tamil characters.")

(defconst kannada-composable-pattern
  (concat
   "\\([ಂ-ಔೠಌ]\\)\\|[ಃ]"
   "\\|\\("
   "\\(?:\\(?:[ಕ-ಹ]್\\)?\\(?:[ಕ-ಹ]್\\)?\\(?:[ಕ-ಹ]್\\)?[ಕ-ಹ]್\\)?"
   "[ಕ-ಹ]\\(?:್\\|[ಾ-್ೕೃ]?\\)?"
   "\\)")
  "Regexp matching a composable sequence of Kannada characters.")

(defconst malayalam-composable-pattern
  (concat
   "\\([അ-ഔ][ം]?\\)\\|ഃ"
   "\\|\\("
   "\\(?:\\(?:[ക-ഹ]്\\)?\\(?:[ക-ഹ]്\\)?\\(?:[ക-ഹ]്\\)?[ക-ഹ]്\\)?"
   "[ക-ഹ]\\(?:്\\|[ാ-ൃെേൈൊൊോൌ]?[ം്]?\\)?"
   "\\)")
  "Regexp matching a composable sequence of Malayalam characters.")

(let ((script-regexp-alist
       `((devanagari . "[\x900-\x97F\x200C\x200D]+")
	 (bengali . "[\x980-\x9FF\x200C\x200D]+")
	 (gurmukhi . "[\xA00-\xA7F\x200C\x200D]+")
	 (gujarati . "[\xA80-\xAFF\x200C\x200D]+")
	 (oriya . "[\xB00-\xB7F\x200C\x200D]+")
	 (tamil . "[\xB80-\xBFF\x200C\x200D]+")
	 (telugu . "[\xC00-\xC7F\x200C\x200D]+")
	 (kannada . "[\xC80-\xCFF\x200C\x200D]+")
	 (malayalam . "[\xD00-\xD7F\x200C\x200D]+"))))
  (map-char-table
   #'(lambda (key val)
       (let ((slot (assq val script-regexp-alist)))
	 (if slot
	     (set-char-table-range
	      composition-function-table key
	      (list (vector (cdr slot) 0 'font-shape-gstring))))))
   char-script-table))

(provide 'indian)

;; arch-tag: 83aa8fc7-7ee2-4364-a6e5-498f5e3b8c2f
;;; indian.el ends here