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Filename : TELU-OTF.flt
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;; TELU-OTF.flt -- Font Layout Table for Telugu OpenType fonts
;; Copyright (C) 2004, 2007, 2008, 2010 AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter telu-otf nil
      (version "1.6.0")
      (font (nil nil unicode-bmp :otf=telu)))

;;; <li> TELU-OTF.flt
;;;
;;; For Telugu OpenType fonts to draw the Telugu script.

(category
 (0x0C00 0x0C7F	?X)			; generic
 (0x0C01 0x0C03	?A)			; SIGN CANDRABINDU .. VISARGA
 (0x0C05 0x0C14	?V)			; LETTER A .. AU
 (0x0C15 0x0C39 ?C)			; LETTER KA .. HA
 (0x0C3E 0x0C42	?u)			; VOWEL SIGN AA .. II
 (0x0C43 0x0C44	?p)			; VOWEL SIGN U .. VOCALIC RR
 (0x0C46 0x0C47	?u)			; VOWEL SIGN E .. EE
 (0x0C4A 0x0C4C	?u)			; VOWEL SIGN O .. AU
 (0x0C4D	?H)			; SIGN VIRAMA
 (0x0C55	?u)			; LENGTH MARK
 (0x0C56	?b)			; AI LENGTH MARK
 (0x0C58 0x0C59 ?C)			; LETTER TSA .. DZA
 (0x0C60 0x0C61	?V)			; LETTER VOCALIC RR .. VOCALIC LL
 (0x0C62 0x0C63 ?b)			; VOWEL SIGN VOCALIC L .. VOCALIC LL

 (0x200C	?N)			; ZWNJ
 (0x200D	?J)			; ZWJ
 (0x25CC	?X)			; DOTTED CIRCLE

 (blwf		?B)
 )

;; Stage 0
;; Preprocessing
(generator
 (0
  (cond
   ;; Decompose two-part vowel signs.
   ((0x0C48)
    0x0C46 0x0C56)

   ("." =))
  *))

;; Stage 1
;; Syllable identification
(generator
 (0
  (cond
   ;; Consonant-based syllables
   ;;1 23            4
   ("(C((J?H|HJ?)C)*)(H[NJ]?|u?b?p?A?)"
    < |
    (cond
     (".+HJ$" :otf=telu=nukt,akhn+)
     ("(.+)(H)N?$" (1 :otf=telu=nukt,akhn+) (2 =) 0x200C)
     (".+" :otf=telu=nukt,akhn+))
    | >)

   ;; Syllables with an independent vowel
   ;;1  2      3
   ("(V)(J?HC)?(u?b?p?A?)"
    < | (1 =) (2 :otf=telu=blwf+) (3 = *) | >)

   ;; Two-part vowel signs
   ((0x0C46 0x0C56)
    (cond
     ((font-facility 0x25CC) < 0x25CC = = >)
     (".+" [ 0x0C48 ])))

   ;; Combining marks are displayed with a DOTTED CIRCLE.
   ("[HubpA]"
    (cond
     ((font-facility 0x25CC) < 0x25CC = >)
     ("." [ = ])))

   ;; Isolated blwf is displayed with a DOTTED CIRCLE in the
   ;; next stage.
   ("(J)(H)(C)"
    < | (1 =) (3 =) (2 = ) | >)

   ("." =))
  *))

;; Stage 2
;; Reorder halant for blwf
(generator
 (0
  (cond
   ;; Isolated blwf
   (" J(CH) "
    (cond
     ((font-facility 0x25CC) < 0x25CC (1 :otf=telu=blwf+) >)
     (" J(CH) " [ (1 :otf=telu=blwf+) ])))

   ;; Syllables with an overt halant
   (" ([^ ]+)(HN) "
    | (1 reorder *) (2 = =) |)

   ;; Ordinary syllables
   (" ([^ubpA ]+)(u?b?p?A?) "
    | (1 reorder *) (2 = *) |)

   ("." =))
  *)

 (reorder
  (cond
   ("J?(H)(C)"
    (2 =) (1 =))
   ("." =)))
 )

;; Stage 3
;; Language forms
;; Although all consonants have a blow form and none has a half form,
;; we have to prevent the first consonant from forming the below form.
(generator
 (0
  (cond
   ;; Overt halant forms
   (" ([^ ]+)(HN) "
    |
    (1 (cond ("(.H)J?(.*)" (1 :otf=telu=half+) (2 lang-forms *))
	     (".+" lang-forms *)))
    (2 = =) |)

   ;; Other syllables
   (" ([^ubpA ]*)(u?b?p?A?) "
    |
    (1 (cond ("(.H)J?(.*)" (1 :otf=telu=half+) (2 lang-forms *))
	     (".+" lang-forms *)))
    (2 = *) |)

   ("." =))
  *)

 (lang-forms
  (cond
   ("(.H)J" (1 :otf=telu=half+))
   (".H" :otf=telu=blwf,half+)
   ("." =)))
 )

;; Stage 4
;; Move subscript glyphs
(generator
 (0
  (cond
   (" ([^B ]*[^BJ])J?(B*)(ub?|b)([^ ]*) "
    | (1 = *) (3 = *) (2 = *) (4 = *) |)

   ("." =))
  *))

;; Stage 5
;; Presentation forms
(generator
 (0
  (cond
   (" ([^ ]+) "
    | (1 :otf=telu=pres,abvs,blws,psts,haln+) |)

   ("." =))
  *))

;; Stage 6
;; Remove ZWNJ/ZWJ
(generator
 (0
  (cond
   ("[NJ]")

   ("." =))
  *))

;; Stage 7
;; GPOS processing
(generator
 (0
  (cond
   (" ([^ ]+) "
    (1 :otf=telu=+abvm,blwm,dist))

   ("." =))
  *))

;; Copyright (C) 2004, 2007, 2008, 2010
;;   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: