;; GURU-OTF.flt -- Font Layout Table for Gurmukhi 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; <li> GURU-OTF.flt
;;;
;;; For Gurmukhi OpenType fonts to draw the Punjabi script.
;;; Designed for saab.otf (version 0.91).
;;; <http://guca.sourceforge.net/typography/fonts/saab/index.shtml>

(category
 ;; C: general consonant
 ;; Y: post-base consonat (YA)
 ;; R: below-base consonat (RA, VA, HA)
 ;; n: NUKTA
 ;; H: HALANT
 ;; m: MATRA (pre)
 ;; u: MATRA (above)
 ;; b: MATRA (below)
 ;; p: MATRA (post)
 ;; A: vowel modifier (above)
 ;; 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
 (0x0A00 0x0A7F	?E)			; ELSE
 (0x0A01	?A)			; SIGN ADAK BINDI (above)
 (0x0A02	?A)			; SIGN BINDI (above)
 (0x0A03	?a)			; SIGN VISARGA (post)
 (0x0A05 0x0A14	?V)			; LETTER A .. LETTER AU
 (0x0A15 0x0A38 ?C)			; LETTER KA .. LETTER SA
 (0x0A2F	?Y)			; LETTER YA
 (0x0A30	?R)			; LETTER RA
 (0x0A35	?R)			; LETTER VA
 (0x0A39	?R)			; LETTER HA
 (0x0A3C	?n)			; SIGN NUKTA
 (0x0A3E	?p)			; VOWEL SIGN AA (post)
 (0x0A3F	?m)			; VOWEL SIGN I (pre)
 (0x0A40	?p)			; VOWEL SIGN II (post)
 (0x0A41	?b)			; VOWEL SIGN U (below)
 (0x0A42	?b)			; VOWEL SIGN UU (below)
 (0x0A47	?u)			; VOWEL SIGN EE (above)
 (0x0A48	?u)			; VOWEL SIGN AI (above)
 (0x0A4B	?u)			; VOWEL SIGN OO (above)
 (0x0A4C	?u)			; VOWEL SIGN AU (above)
 (0x0A4D	?H)			; SIGN VIRAMA (HALANT)
 (0x0A59 0x0A5E	?C)			; LETTER KHHA .. LETTER FA
 (0x0A70	?A)			; TIPPI (above)
 (0x0A7F	?X)			; internal use
 )

;; Step 1 : Syllable identification and Halant movement.
(generator
 (0
  (cond
   ;; A syllable ending with a vowel sign and/or a vowel modifier.
   ("(([CRY]n?H)*[CRY]n?)([mubp][Aa]?|[Aa])"
    < | (1 move-base-Halant) (3 =) | >)

   ;; A syllable without a vowel sign nor a vowel modifier.
   ("(([CRY]n?H)*[CRY]n?)(H)?"
    < | move-base-Halant | >)

   ;; A syllable starting with an independent vowel.
   ("V[Aa]?"
    < | = * | > )

   ("." =))
  *)

 ;; Move Halant on the base consonant to the tail.
 ;; 0x0A7F indicates the position for above- or below Matra.
 (move-base-Halant
  (cond
   ("(([CRY]n?H)*[CRY]n?)(H)(Y)$"
    (1 = *)
    0x0A7F
    (4 =)
    (3 =))
   ("(([CRY]n?H)*[CRY]n?)(H)(R)$"
    (1 = *)
    (4 =)
    (3 =)
    0x0A7F)
   ("([CRY]n?H)*[CRY]n?H$"
    = * 0x200C)
   (".*"
    = * 0x0A7F))))

;; Step 2 : Move Matra.
(generator
 (0
  (cond
   ;; 1          2    3   4      5   6
   (" ([CRYnH]*)X(YH)?(m)?([ub])?(p)?([Aa])? "
    | (3 =) (1 = *) (4 =) (2 = =) (5 =) (6 =) |)
   ("." =))
  *))

;; Step 3 : Drive OTF tables.
(generator
 (0
  (cond
   (" ([^ ]*H)N "
    (1 otf:guru=nukt))
   (" ([^ ]*) "
    (1 otf:guru=nukt,blwf,pstf,vatu,pres,abvs,blws,psts))
   ((0x0A71)
    otf:guru)
   ("."
    [ otf:guru=+ ] ))
  *))

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