;; GUJR-OTF.flt -- Font Layout Table for Gujarati OpenType fonts
;; Copyright (C) 2004, 2007  AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter gujr-otf nil
      (font (nil nil unicode-bmp :otf=gujr=rphf)))

;;; <li> GUJR-OTF.flt
;;;
;;; For Gujarati OpenType fonts to draw the Gujarati script.

(category
 ;; C: consonant (except for RA)
 ;; R: consonant RA
 ;; n: NUKTA
 ;; H: HALANT
 ;; m: vowel sign (pre)
 ;; u: vowel sign (above)
 ;; b: vowel sign (below)
 ;; p: vowel sign (post)
 ;; A: vowel modifier (above)
 ;; a: vowel modifier (post)
 ;; V: independent vowel
 ;; N: ZWNJ
 ;; J: ZWJ
 ;; X: generic
 (0x0A80 0x0AFF	?X)			; generic
 (0x0A81 0x0A82	?A)			; SIGN CANDRABINDU .. ANUSVARA
 (0x0A83	?a)			; SIGN VISARGA
 (0x0A85 0x0A94	?V)			; LETTER AA .. AU
 (0x0A95 0x0AB9 ?C)			; LETTER KA .. HA
 (0x0AB0	?R)			; LETTER RA
 (0x0ABC	?n)			; SIGN NUKTA
 (0x0ABE 	?p)			; VOWEL SIGN AA
 (0x0ABF	?m)			; VOWEL SIGN I
 (0x0AC0	?p)			; VOWEL SIGN II
 (0x0AC1 0x0AC4	?b)			; VOWEL SIGN U .. VOCALIC RR
 (0x0AC5 0x0AC8	?u)			; VOWEL SIGN CANDRA E .. AI
 (0x0AC9 0x0ACC	?p)			; VOWEL SIGN CANDRA O .. AU
 (0x0ACD	?H)			; SIGN VIRAMA
 (0x0AE0 0x0AE1	?V)			; LETTER VOCALIC RR .. VOCALIC LL
 (0x0AE2 0x0AE3	?b)			; VOWEL SIGN VOCALIC L .. VOCALIC LL
 (0x0964 0x0965	?X)			; DANDA .. DOUBLE DANDA
 (0x200C	?N)			; ZWNJ
 (0x200D	?J)			; ZWJ
 )

;; Syllable identification and reordering.
(generator
 (0
  (cond
   ;; A syllable containing a vowel sign.
   ;;1      2            34   5       6
   ("([CR]n?(HJ?[CR]n?)*)((m)|(b|u|p))(A|a)?"
    < | (4 =) (1 move-h) (5 =) (1 reph) (6 =) | >)

   ;; A syllable without vowel signs but with a vowel modifier.
   ;;1      2            3
   ("([CR]n?(HJ?[CR]n?)*)(A|a)"
    < | (1 move-h) (1 reph) (3 =) | >)

   ;; No marks at all.  Need further anylysis.
   ("[CR]n?(HJ?[CR]n?)*(H(N|J)?)?"
    < | (0 nomarks) | >)

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

   ("." =))
  *)

 (move-h
  (cond
   ("RH(.+)(H)(R)$"
    (1 = *) (3 =) (2 =))
   ("RH(.+)"
    (1 = *))

   ("(.+)(H)(R)$"
    (1 = *) (3 =) (2 =))
   (".+"
    = *)))

 (reph
  (cond
   ("(RH).*"
    (1 otf:gujr=rphf+))))

 (del-reph
  (cond
   ("(RH)?(.*)"
    (2 = *))))

 (nomarks
  (cond
   ;; Ending with a Halant and a ZWJ.
   (".+HJ$"
    (0 del-reph) (0 reph))

   ;; Ending with a Halant and an optional ZWNJ.  Add ZWNJ explicitly.
   ("(.+)(H)N?$"
    (1 move-h) (1 reph) (2 =) 0x200C)

   ;; Ending with a consonant.
   (".+"
    (0 move-h) (0 reph))))
 )

;; Apply GSUB features.  If a syllable ends with a halant and a ZWNJ,
;; render the final halant explicitly.  Do not apply 'blwf' to the
;; initial RA.
(generator
 (0
  (cond
   (" (R)([^ ]*)(H)N "
    | (1 =) (2 gsub) (3 =) |)
   (" (m?R)([^ ]*) "
    | (1 otf:gujr=pres+) (2 gsub) |)

   (" ([^ ]+)(H)N "
    | (1 gsub) (2 =) |)
   (" ([^ ]+) "
    | (1  gsub) |)

   ("." =))
  *)

 (gsub
  (cond
   ("([^J]*)J(.*)"
    (1 otf:gujr=nukt,akhn,blwf,half,vatu,pres+) (2 gsub))
   (".*"
    otf:gujr=nukt,akhn,blwf,half,vatu,pres+)))
 )

;; Apply other features.
(generator
 (0
  (cond
   (" ([^ ]+) "
    (1 otf:gujr=abvs,blws,psts,haln+abvm,blwm,dist))
   ("."
    [ = ]))
  *))

;; Copyright (C) 2004, 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.

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