;; SINH-OTF.flt -- Font Layout Table for Sinhala OpenType fonts
;; Copyright (C) 2004, 2005, 2007
;;   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> SINH-OTF.flt
;;;
;;; For Sinhala OpenType fonts to draw Sinhala.
;;; A Font is available from <http://sinhala.linux.lk/>.

(font layouter sinh-otf nil
      (font (nil nil unicode-bmp :otf=sinh=akhn)))

(category
 ;; V : independent vowels
 ;; C : consonants
 ;; H : AL-LAKUNA (virama)
 ;; m : KOMBUVA
 ;; M : DIGA KOMBUVA
 ;; b : below-consonant vowel signs
 ;; u : above-consonant vowel signs
 ;; p : post-consonant vowel signs
 ;; q : AELA-PILLA
 ;; r : GAYANUKITTA
 ;; s : KOMBUVA HAA AELA-PILLA
 ;; t : two-part vowel sign
 ;; a : AVUSVARAYA & VISARGAYA
 ;; E : else
 ;; J : ZERO WIDTH JOINER
 (0x0D80 0x0DFF ?E)
 (0x0D82 0x0D83 ?a)
 (0x0D85 0x0D96 ?V)
 (0x0D96 0x0DC6 ?C)
 (0x0DCA	?H)
 (0x0DCF	?q)
 (0x0DD0 0x0DD1 ?p)
 (0x0DD2 0x0DD3 ?u)
 (0x0DD4 0x0DD6 ?b)
 (0x0DD8	?p)
 (0x0DD9	?m)
 (0x0DDA	?t)
 (0x0DDB	?M)
 (0x0DDC	?s)
 (0x0DDD 0x0DDE ?t)
 (0x0DDF	?r)
 (0x0DF2 0x0DF3 ?p)
 (0x200D	?J)
 )

;; Step 0 : Syllable identification
(generator

 (0
  (cond
   ;; A syllable containing a completely decomposed two-part vowel sign.
   ("(C(HJ[CR])*)(m(H|qH?|r)a?)"
    < | (1 otf:sinh=akhn,vatu,pres) (3 = *) | >)

   ;; A syllable containing KOMBUVA HAA AELA-PILLA.
   ("(C(HJ[CR])*)(s)(H)?(a)?"
    < | (1 otf:sinh=akhn,vatu,pres) (3 two-part) (4 =) (5 =) | >)

   ;; A syllable with a two-part vowel sign.
   ("(C(HJ[CR])*)(t)(a)?"
    < | (1 otf:sinh=akhn,vatu,pres) (3 two-part) (4 =) | >)

   ;; A syllable with a vowel sign and/or a various sign.
   ("(C(HJ[CR])*)([mMbupqr]a?|a)"
    < | (1 otf:sinh=akhn,vatu,pres) (3 = *) | >)

   ;; No signs.
   ("C(HJ[CR])*H?"
    < | otf:sinh=akhn,vatu,pres | >)

   ;; Independent vowels.
   ("Va?"
    < | = * | >)

   ("." =))
  *)

 ;; Split two-part dependent vowel signs for canonicalisation.
 (two-part
  (cond
   ((0x0DDA)	0x0DD9 0x0DCA)
   ((0x0DDC)	0x0DD9 0x0DCF)
   ((0x0DDD)	0x0DD9 0x0DCF 0x0DCA)
   ((0x0DDE)	0x0DD9 0x0DDF)))
 )

;; Step 1 : Move pre-consonant signs.
(generator
 (0
  (cond
   ;; 1             2     3   4   5   6   7   8   9
   (" ([^ mMbupqr]+)(m|M)?(b)?(u)?(p)?(q)?(r)?(H)?(a)? "
    | (2 =) (1 = *) (3 =) (4 =) (5 =) (6 =) (7 =) (8 =) (9 =) |)
   ("." =))
  *))

;; Step 2 : OTF substitutions.
(generator
 (0
  (cond
   (" ([^ ]*) "
    (1 otf:sinh))
   ("."
    [ otf:sinh=+ ]))
  *))

;; Local Variables:
;; mode: emacs-lisp
;; End: