Completely re-written.

1 files changed, 90 insertions, 286 deletions

diff --git a/lisp/language/indian.el b/lisp/language/indian.el
index 617c20123be..28d313215db 100644
--- a/lisp/language/indian.el
+++ b/lisp/language/indian.el
@@ -1,10 +1,9 @@
-;;; indian.el --- support for Indian Languages -*- coding: iso-2022-7bit; -*-
+;;; indian.el --- Indian languages support -*- coding: iso-2022-7bit; -*-
 
-;; Copyright (C) 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
 
-;; Author: KAWABATA, Taichi <kawabata@is.s.u-tokyo.ac.jp>
-
-;; Keywords: multilingual, Indian
+;; Maintainer:  KAWABATA, Taichi <batta@beige.ocn.ne.jp>
+;; Keywords:	multilingual, Indian
 
 ;; This file is part of GNU Emacs.
 
@@ -25,290 +24,95 @@
 
 ;;; 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.
+;; This file defines in-is13194 coding system and relationship between
+;; indian-glyph character-set and various CDAC fonts.
 
 ;;; Code:
 
-;;  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!$(B"
-
-;;; ITRANS
-;;
-;; ITRANS is one of the most popular method to exchange indian scripts
-;; electronically.  Here is the table to convert between ITRANS code and
-;; IS 13194 code.
-
-(defvar indian-itrans-consonant-alist
-  '(
-    ("k" . "(53(B")
-    ("kh" . "(54(B")
-    ("g" . "(55(B")
-    ("gh" . "(56(B")
-    ("N^" . "(57(B")
-    ("ch" . "(58(B")
-    ("chh" . "(59(B")
-    ("j" . "(5:(B")
-    ("jh" . "(5;(B")
-    ("JN" . "(5<(B")
-    ("T" . "(5=(B")
-    ("Th" . "(5>(B")
-    ("D" . "(5?(B")
-    ("Dh" . "(5@(B")
-    ("N" . "(5A(B")
-    ("t" . "(5B(B")
-    ("th" . "(5C(B")
-    ("d" . "(5D(B")
-    ("dh" . "(5E(B")
-    ("n" . "(5F(B")
-    ("nh" . "(5G(B")     ; For transcription of non-Devanagari Languages.
-    ("p" . "(5H(B")
-    ("ph" . "(5I(B")
-    ("b" . "(5J(B")
-    ("bh" . "(5K(B")
-    ("m" . "(5L(B")
-    ("y" . "(5M(B")
-    ("yh" . "(5N(B")      ; For transcription of non-Devanagari Languages.
-    ("r" . "(5O(B")
-    ("rh" . "(5P(B")      ; For transcription of non-Devanagari Languages.
-    ("l" . "(5Q(B")
-    ("v" . "(5T(B")
-    ("sh" . "(5U(B")
-    ("shh" . "(5V(B")
-    ("s" . "(5W(B")
-    ("h" . "(5X(B")
-    ("ld" . "(5R(B")
-    ("L" . "(5R(B")
-    ("ksh" . "$(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))))
+(make-coding-system
+ 'in-is13194 2 ?D
+ "8-bit encoding for ASCII (MSB=0) and IS13194-Devanagari (MSB=1)"
+ '(ascii indian-is13194 nil nil
+   nil ascii-eol)
+ '((safe-charsets ascii indian-is13194)
+   (post-read-conversion . in-is13194-post-read-conversion)
+   (pre-write-conversion . in-is13194-pre-write-conversion)))
+
+(defvar indian-script-table
+  '[
+    devanagari
+    sanskrit
+    bengali
+    tamil
+    telugu
+    assamese
+    oriya
+    kannada
+    malayalam
+    gujarati
+    punjabi
+    ]
+  "Vector of Indian script names.")
+
+(let ((len (length indian-script-table))
+      (i 0))
+  (while (< i len)
+    (put (aref indian-script-table i) 'indian-glyph-code-offset (* 256 i))
+    (setq i (1+ i))))
+
+(defvar indian-default-script 'devanagari
+  "Default script for Indian languages.
+Each Indian language environment sets this value
+to one of `indian-script-table' (which see).
+The default value is `devanagari'.")
+
+(defun indian-glyph-char (index &optional script)
+  "Return character of charset `indian-glyph' made from glyph index INDEX.
+The variable `indian-default-script' specifies the script of the glyph.
+Optional argument SCRIPT, if non-nil, overrides `indian-default-script'.
+See also the function `indian-char-glyph'."
+  (or script
+      (setq script indian-default-script))
+  (let ((offset (get script 'indian-glyph-code-offset)))
+    (or (integerp offset)
+	(error "Invalid script name: %s" script))
+    (or (and (>= index 0) (< index 256))
+	(error "Invalid glyph index: %d" index))
+    (setq index (+ offset index))
+    (make-char 'indian-glyph (+ (/ index 96) 32) (+ (% index 96) 32))))
+
+(defvar indian-glyph-max-char
+  (indian-glyph-char
+   255 (aref indian-script-table (1- (length indian-script-table))))
+  "The maximum valid code of characters in the charset `indian-glyph'")
+
+(defun indian-char-glyph (char)
+  "Return information about the glphy code for CHAR of `indian-glyph' charset.
+The value is (INDEX . SCRIPT), where INDEX is the glyph index
+in the font that Indian script name SCRIPT specifies.
+See also the function `indian-glyph-char'."
+  (let ((split (split-char char))
+	code)
+    (or (eq (car split) 'indian-glyph)
+	(error "Charset of `%c' is not indian-glyph" char))
+    (or (<= char indian-glyph-max-char)
+	(error "Invalid indian-glyph char: %d" char))
+    (setq code (+ (* (- (nth 1 split) 32) 96) (nth 2 split) -32))
+    (cons (% code 256) (aref indian-script-table (/ code 256)))))
+
+(define-ccl-program ccl-encode-indian-glyph-font
+  `(0
+    ;; Shorten (r1 = (((((r1 - 32) * 96) + r2) - 32) % 256))
+    (r1 = ((((r1 * 96) + r2) - ,(+ (* 32 96) 32)) % 256))))
+
+(setq font-ccl-encoder-alist
+      (cons (cons "-CDAC" 'ccl-encode-indian-glyph-font)
+	    font-ccl-encoder-alist))
+
+(setq font-ccl-encoder-alist
+      (cons '("ISO10646.*-1" . ccl-encode-unicode-font)
+	    font-ccl-encoder-alist))
 
 (provide 'indian)
-  
+
 ;;; indian.el ends here