--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/language/indian.el	Mon Aug 13 09:41:43 2007 +0200
@@ -0,0 +1,357 @@
+;;; indian.el --- Support for Indian Languages
+
+;; Copyright (C) 1995 Free Software Foundation, Inc.
+
+;; Author: KAWABATA, Taichi <kawabata@is.s.u-tokyo.ac.jp>
+
+;; Keywords: multilingual, 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 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.
+
+;;; Commentary:
+
+;; History:
+;; 1996.10.18 written by KAWABATA, Taichi <kawabata@is.s.u-tokyo.ac.jp>
+
+;; For Indian, the character set IS 13194 is supported.
+;;
+;; IS 13194 does not specifically assign glyphs for each characters.
+;; Following code is not specific to each Indian language.
+;;
+;; Eventually, this code will support generic information about
+;; following scripts.
+;;
+;;    Devanagari
+;;    Bengali
+;;    Gurmukhi
+;;    Gujarati
+;;    Oriya
+;;    Tamil
+;;    Telgu
+;;    Kannada
+;;    Malayalam
+;;
+;; In this file, charsets other than charset-ascii and charset-indian-is13194
+;; should not be used except in the comment.
+
+;;; Code:
+
+(defun describe-indian-support ()
+  "Describe how Emacs support Indian languages."
+  (interactive)
+  (describe-language-support-internal "Indian"))
+
+(set-language-info-alist
+ "Indian" '((describe-function . describe-indian-support)
+	    (charset . (indian-is13194))
+	    (documentation . "\
+Among Indian languages, such languages using Devanagari scripts as
+Hindi and Marathi are supproted.  For them, please specify Devanagari
+for more detail.")
+	    ))
+
+;;  Followings are what you see when you refer to the Emacs
+;;  representations of IS 13194 charcters.  However, this is merely
+;;  tentative apperance, and you must convert them by
+;;  indian-to-xxxxxx(specific script) function to use them.
+;;  Devanagari is not an exception of this rule.
+
+;;     0xa0 //(5!"#$%&'()*+,-./(B
+;;     0xb0 (50123456789:;<=>?(B
+;;     0xc0 (5@ABCDEFGHIJKLMNO(B
+;;     0xd0 (5PQRSTUVWXYZ[\]^_(B
+;;     0xe0 (5`abcdefghijklmno(B
+;;     0xf0 (5pqrstuvwxyz{|}~(B//
+
+;; Note - In IS 13194, several symbols are obtained by special
+;; combination of several characters and Nukta sign.
+;;
+;;   Sanskrit Vowel R  -> (5*(B + (5i(B
+;;   Sanskrit Vowel L  -> (5&(B + (5i(B
+;;   Sanskrit Vowel LL -> (5'(B + (5i(B
+;;   Sanskrit Avagrah  -> (5j(B + (5i(B
+;;   OM                -> (5!(B + (5i(B
+;;
+;; Note - IS 13194 defines ATR(0xEF) and EXT(0xF0), but they are
+;; not used in Emacs.
+;;
+;; Note - the above characters DO NOT represent any script.  For
+;; example, if you want to obtain Devanagari character, you must do
+;; something like the following.
+;;
+;;   (char-to-string (indian-to-devanagari ?(5$(B))
+;;   "$(5!$(B"
+
+(let ((deflist	
+	'(;; chars	syntax	category
+	  ("(5!"#(B"	"w"	?7) ; vowel-modifying diacritical mark
+				    ; chandrabindu, anuswar, visarga
+	  ("(5$(B-(52(B"	"w"	?5) ; independent vowel
+	  ("(53(B-(5X(B"	"w"	?0) ; consonant
+	  ("(5Z(B-(5g(B"	"w"	?8) ; matra
+	  ("(5q(B-(5z(B"	"w"	?6) ; digit
+	  ))
+      elm chars len syntax category to ch i)
+  (while deflist
+    (setq elm (car deflist))
+    (setq chars (car elm)
+	  len (length chars)
+	  syntax (nth 1 elm)
+	  category (nth 2 elm)
+	  i 0)
+    (while (< i len)
+      (if (= (aref chars i) ?-)
+	  (setq i (1+ i)
+		to (sref chars i))
+	(setq ch (sref chars i)
+	      to ch))
+      (while (<= ch to)
+	(modify-syntax-entry ch syntax)
+	(modify-category-entry ch category)
+	(setq ch (1+ ch)))
+      (setq i (+ i (char-bytes to))))
+    (setq deflist (cdr deflist))))
+
+
+;;; ITRANS
+;;
+;; ITRANS is one of the most popular method to exchange indian scripts
+;; electronically.  Here is the table to convert between ITRANS code and
+;; IS 13194 code.
+
+(defvar indian-itrans-consonant-alist
+  '(
+    ("k" . "(53(B")
+    ("kh" . "(54(B")
+    ("g" . "(55(B")
+    ("gh" . "(56(B")
+    ("N^" . "(57(B")
+    ("ch" . "(58(B")
+    ("chh" . "(59(B")
+    ("j" . "(5:(B")
+    ("jh" . "(5;(B")
+    ("JN" . "(5<(B")
+    ("T" . "(5=(B")
+    ("Th" . "(5>(B")
+    ("D" . "(5?(B")
+    ("Dh" . "(5@(B")
+    ("N" . "(5A(B")
+    ("t" . "(5B(B")
+    ("th" . "(5C(B")
+    ("d" . "(5D(B")
+    ("dh" . "(5E(B")
+    ("n" . "(5F(B")
+    ("nh" . "(5G(B")     ; For transcription of non-Devanagari Languages.
+    ("p" . "(5H(B")
+    ("ph" . "(5I(B")
+    ("b" . "(5J(B")
+    ("bh" . "(5K(B")
+    ("m" . "(5L(B")
+    ("y" . "(5M(B")
+    ("yh" . "(5N(B")      ; For transcription of non-Devanagari Languages.
+    ("r" . "(5O(B")
+    ("rh" . "(5P(B")      ; For transcription of non-Devanagari Languages.
+    ("l" . "(5Q(B")
+    ("v" . "(5T(B")
+    ("sh" . "(5U(B")
+    ("shh" . "(5V(B")
+    ("s" . "(5W(B")
+    ("h" . "(5X(B")
+    ("ld" . "(5R(B")
+    ("L" . "(5R(B")
+    ("ksh" . "$(5!3!h!V(B")
+    ("GY" . "***GY***")  ; Must check out later.
+    ;; special consonants
+    ("q" . "(53i(B")
+    ("K" . "(54i(B")
+    ("G" . "(55i(B")
+    ("z" . "(5:i(B")
+    ("f" . "(5Ii(B")
+    (".D" . "(5?i(B")
+    (".Dh" . "(5@i(B")
+  ))
+
+(defvar indian-itrans-vowel-sign-alist
+  '(
+    ;; Special treatment unique to IS 13194 Transliteration
+    ("" . "(5h(B")
+    ("a" . "")
+    ;; Matra (Vowel Sign)
+    ("aa" . "(5Z(B")
+    ("A" . "(5Z(B")
+    ("i" . "(5[(B")
+    ("ii" . "(5\(B")
+    ("I" . "(5\(B")
+    ("u" . "(5](B")
+    ("uu" . "(5^(B")
+    ("U" . "(5^(B")
+    ("R^i" . "(5_(B")     ; These must be checked out later.
+    ("R^I" . "(5_i(B")
+    ("L^i" . "(5[i(B")
+    ("L^I" . "(5\i(B")
+    ("E" . "(5`(B")       ; For transcription of non-Devanangri Languages.
+    ("e" . "(5a(B")
+    ("ai" . "(5b(B") 
+    ;; ("e.c" . "(5c(B")     ; Tentatively suppressed.
+    ("O" . "(5d(B")       ; For transcription of non-Devanagari Languages.
+    ("o" . "(5e(B")
+    ("au" . "(5f(B")
+    ;; ("o.c" . "(5g(B")     ; Tentatively suppressed.
+    ))
+
+;;
+;; Independent vowels and other signs.
+;;
+
+(defvar indian-itrans-other-letters-alist
+  '(
+    ("a" . "(5$(B")
+    ("aa" . "(5%(B")
+    ("A" . "(5%(B")
+    ("i" . "(5&(B")
+    ("ii" . "(5'(B")
+    ("I" . "(5'(B")
+    ("u" . "(5((B")
+    ("uu" . "(5)(B")
+    ("U" . "(5)(B")
+    ("R^i" . "(5*(B")
+    ("R^I" . "(5*i(B")
+    ("L^i" . "(5&i(B")
+    ("L^I" . "(5'i(B")
+    ("E" . "(5+(B")	; For transcription of non-Devanagari Languages.
+    ("e" . "(5,(B")
+    ("ai" . "(5-(B")
+    ;; ("e.c" . "(5.(B")	; Candra E
+    ("O" . "(5/(B")	; For transcription of non-Devanagari Languages.
+    ("o" . "(50(B")
+    ("au" . "(51(B")
+    ;; ("o.c" . "(52(B")	; Candra O
+    ("M" . "(5$(B")
+    ("H" . "(5#(B")
+    ("AUM" . "(5!i(B")
+    ("OM" . "(5!i(B")
+    (".r" . "(5Oh(B")
+    (".n" . "(5"(B")
+    (".N" . "(5!(B")
+    (".h" . "(5h(B")        ; Halant
+    (".." . "(5j(B")
+    (".a" . "(5ji(B")      ; Avagrah
+    ("0" . "(5q(B")
+    ("1" . "(5r(B")
+    ("2" . "(5s(B")
+    ("3" . "(5t(B")
+    ("4" . "(5u(B")
+    ("5" . "(5v(B")
+    ("6" . "(5w(B")
+    ("7" . "(5x(B")
+    ("8" . "(5y(B")
+    ("9" . "(5z(B")
+    ))
+
+;; Regular expression matching single Indian character represented
+;; by ITRANS.
+
+(defvar indian-itrans-regexp
+  (let ((consonant "\\([cs]hh?\\)\\|[kgjTDnpbyr]h?\\|\\(N\\^?\\)\\|\\(jN\\)\\|[mvqKGzfs]\\|\\(ld?\\)\\|\\(ksh\\)\\|\\(GY\\)\\|\\(\\.Dh?\\)")
+	(vowel "\\(a[aiu]\\)\\|\\(ii\\)\\|\\(uu\\)\\|\\([RL]\\^[iI]\\)\\|[AIEOeoaiu]")
+	(misc "[MH0-9]\\|\\(AUM\\)\\|\\(OM\\)\\|\\(\\.[rnNh\\.a]\\)")
+	(lpre "\\(") (rpre "\\)") (orre "\\|"))
+    (concat lpre misc rpre orre
+	    lpre lpre consonant rpre "?" lpre vowel rpre rpre orre
+	    lpre consonant rpre )))
+
+;;
+;; Regular expression matching single ITRANS unit for IS 13194 characters.
+;;
+
+(defvar itrans-indian-regexp
+  (let ((vowel "[(5$(B-(52(B]")
+	(consonant "[(53(B-(5X(B]")
+	(matra "[(5Z(B-(5g(B]")
+	(misc "[(5q(B-(5z(B]")
+	(lpre "\\(") (rpre "\\)") (orre "\\|"))
+    (concat misc orre
+	    lpre consonant matra "?" rpre orre
+	    vowel)))
+
+;;
+;; IS13194 - ITRANS conversion table for string matching above regexp.
+;;
+
+(defvar indian-itrans-alist
+  (let ((cl indian-itrans-consonant-alist)
+	(ml indian-itrans-other-letters-alist) rules)
+	  (while cl
+	    (let ((vl indian-itrans-vowel-sign-alist))
+	      (while vl
+		(setq rules 
+		      (cons (cons (concat (car (car cl)) (car (car vl)))
+				  (concat (cdr (car cl)) (cdr (car vl))))
+			    rules))
+		(setq vl (cdr vl))))
+	    (setq cl (cdr cl)))
+	  (while ml
+	    (setq rules (cons (cons (car (car ml)) 
+				    (cdr (car ml)))
+			      rules))
+	    (setq ml (cdr ml)))
+	  rules))
+
+;;
+;; Utility program to convert from ITRANS to IS 13194 in specified region.
+;;
+
+(defun indian-decode-itrans-region (from to)
+  "Convert `ITRANS' mnemonics of the current region to Indian characters.
+When called from a program, expects two arguments,
+positions (integers or markers) specifying the stretch of the region."
+  (interactive "r")
+  (save-restriction
+    (narrow-to-region from to)
+    (goto-char (point-min))
+    (while (re-search-forward indian-itrans-regexp nil t)
+      (let* ((itrans (buffer-substring (match-beginning 0) (match-end 0)))
+	     (ch (cdr (assoc itrans indian-itrans-alist))))
+	(if ch
+	    (progn
+	      (delete-region (match-beginning 0) (match-end 0))
+	      (insert ch)))))
+    (goto-char (point-min))
+    (while (re-search-forward "\\((5h(B\\)[^\\c0]" nil t)
+      (delete-region (match-beginning 1) (match-end 1)))))
+
+;;
+;; Utility program to convert from IS 13194 to ITRANS in specified region.
+;;
+
+(defun indian-encode-itrans-region (from to)
+  "Convert indian region to ITRANS mnemonics."
+  (interactive "r")
+  (save-restriction
+    (narrow-to-region from to)
+    (goto-char (point-min))
+    (while (re-search-forward itrans-indian-regexp nil t)
+      (let* ((indian (buffer-substring (match-beginning 0) (match-end 0)))
+	     (ch (car (rassoc indian indian-itrans-alist))))
+	(if ch
+	    (progn
+	      (delete-region (match-beginning 0) (match-end 0))
+	      (insert ch)))))
+    (goto-char (point-min))))
+  
+;;; indian.el ends here