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+;; TEL-OTF.flt -- Font Layout Table for Telugu OpenType fonts
+;; Copyright (C) 2004
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H15PRO112
+
+;; This file is part of the m17n database; a sub-part of the m17n
+;; library.
+
+;; The m17n library is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU Lesser General Public License
+;; as published by the Free Software Foundation; either version 2.1 of
+;; the License, or (at your option) any later version.
+
+;; The m17n library 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
+;; Lesser General Public License for more details.
+
+;; You should have received a copy of the GNU Lesser General Public
+;; License along with the m17n library; if not, write to the Free
+;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+;; 02111-1307, USA.
+
+;;; <li> TEL-OTF.flt
+;;;
+;;; For Telugu OpenType fonts to draw Telugu.
+;;; Designed for Pothana2000.ttf <http://www.kavya-nandanam.com/>
+
+(category
+ ;; C: general consonant
+ ;; R: no below-base consonat (RRA, NNNA, LLLA)
+ ;; H: HALANT
+ ;; u: MATRA (above)
+ ;; b: MATRA (below)
+ ;; p: MATRA (post)
+ ;; t: MATRA (two-part)
+ ;; a: vowel modifier (post)
+ ;; V: independent vowel
+ ;; N: ZWNJ (ZERO WIDTH NON-JOINER)
+ ;; J: ZWJ (ZERO WIDTH JOINER)
+ ;; E: ELSE
+ ;;
+ (0x200C       ?N)                     ; ZWNJ
+ (0x200D       ?J)                     ; ZWJ
+ (0x0964       ?E)                     ; DANDA
+ (0x0965       ?E)                     ; DOUBLE DANDA
+ (0x0C00 0x0C7F        ?E)                     ; ELSE
+ (0x0C01 0x0C03        ?a)                     ; post signs
+ (0x0C05 0x0C14        ?V)                     ; LETTER A .. LETTER AU
+ (0x0C15 0x0C39 ?C)                    ; LETTER KA .. LETTER HA
+ (0x0C29       ?R)                     ; LETTER NNNA
+ (0x0C31       ?R)                     ; LETTER RRA
+ (0x0C34       ?R)                     ; LETTER LLLA
+ (0x0C3E 0x0C40        ?u)                     ; VOWEL SIGN AA, I, II (above)
+ (0x0C41 0x0C44        ?p)                     ; VOWEL SIGN U, UU, R, RR (post)
+ (0x0C46 0x0C47        ?u)                     ; VOWEL SIGN E, EE (above)
+ (0x0C48       ?t)                     ; VOWEL SIGN AI (tow-part)
+ (0x0C4A 0x0C4C        ?u)                     ; VOWEL SIGN O, OO, AU (above)
+ (0x0C4D       ?H)                     ; SIGN VIRAMA (HALANT)
+ (0x0C55       ?u)                     ; LENGTH SIGN (above)
+ (0x0C56       ?b)                     ; AI LENGTH SIGN (below)
+ (0x0C60 0x0C61        ?V)                     ; LETTER VOCALIC RR, LL
+ (0x0C7E       ?Y)                     ; internal use
+ (0x0C7F       ?X)                     ; internal use
+ )
+
+;; Step 1 : Syllable identification and Halant movement.
+(generator
+ (0
+  (cond
+   ;; A syllable containing a two-part vowel sign.
+   ("([CR](HC)*)(t)(a)?"
+    < | (1 move-base-Halant) (3 0x0C46 0x0C56) (4 =) | >)
+
+   ;; A syllable ending with vowel signs and/or a vowel modifier.
+   ("([CR](HC)*)([ubp]+a?|a)"
+    < | (1 move-base-Halant) (3 = *) | >)
+
+   ;; Forced Halant form
+   ("((RH)?(CH)*)(CH)N"
+    < | (1 move-base-Halant) | >
+    < | (4 move-base-Halant) | >)
+
+   ;; Forced Half form
+   ("((RH)?(CH)*)(CH)J"
+    < | (1 move-base-Halant) >
+    < | (4 otf:telu=blwf) | >)
+
+   ;; A syllable without a vowel sign nor a vowel modifier.
+   ("[CR](HC)*H?"
+    < | move-base-Halant | >)
+
+   ;; A syllable starting with an independent vowel.
+   ("Va?"
+    < | = * | > )
+
+   ("." =))
+  *)
+
+ ;; Move Halant on the base consonant to the tail if the syllable ends
+ ;; with a consonant.
+ ;; A leading 0x0C7F means Halant movement.
+ ;; A leading 0x0C7E means a syllable ending with a Halant.
+ (move-base-Halant
+  (cond
+   (".*H$"
+    0x0C7E = *)
+   ("(.)(H)(.*)"
+    0x0C7F (1 =) (3 = *) (2 =))
+   (".*"
+    = *))))
+
+;; Step 2 : Move Matra if applicable.
+;; The base consonant in a Halant-ending syllable is changed into Halant form.
+(generator
+ (0
+  (cond
+   ;;  1  2      3   4   5   6
+   (" X(.)([CH]*)(u)?(b)?(p)?(a)? "
+    | (1 =) (3 =) (4 =) (5 =) (2 = *) (6 =) |)
+   (" Y(..)([^ ]*) "
+    | (1 otf:telu=haln) (2 = *) |)
+   ("." =))
+  *))
+
+;; Step 3 : Drive OTF tables.
+(generator
+ (0
+  (cond
+   (" ([^ ]*) "
+    (1 otf:telu))
+   ("."
+    [ otf:telu=+ ]))
+  *))
+
+;; Local Variables:
+;; mode: emacs-lisp
+;; End: