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File name : TEL2-OTF.flt

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;; TEL2-OTF.flt -- Font Layout Table for tel2 OpenType fonts
;; Copyright (C) 2010 AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter tel2-otf nil
      (version "1.6.0")
      (font (nil nil unicode-bmp :otf=tel2)))

;;; <li> TEL2-OTF.flt
;;;
;;; For tel2 OpenType fonts to draw the Telugu script.

;; gautami.ttf requires the following glyph order to layout the Telugu script.
;; 1. base consonant
;; 2. above matra (0C3E..0C42, 0C46, 0C47, 0C4A, 0C4C)
;; 3. below matra (0C56)
;; 4. blwf consonants
;; 5. post matra (0C43, 0C44)
;; 6. candrabindu (0C01), anusvara (0C02), visarga(0C03)

;; 0C62 and 0C63, which should be below matras, are not yet implemented.

(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 and basic shaping forms
(generator
 (0
  (cond
   ;; Consonant-based syllables
   ;;12          3              4
   ("((CJ?HJ?)*C)(H[NJ]?|u?b?p?)(A)?"
    < | (1 :otf=tel2=locl,akhn,blwf,cjct+) (3 = *) (4 =) | >)

;; Syllables with an independent vowel
   ;;1  2      3
   ("(V)(J?HC)?(u?b?p?A?)"
    < | (1 =) (2 :otf=tel2=locl,blwf+) (3 = *) | >)

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

;; Combining marks are displayed with a DOTTED CIRCLE.
   ("[HubpA]"
    (cond
     ((font-facility 0x25CC) < 0x25CC = >)
     ("." [ = ])))
   ("JHC"
    (cond
     ((font-facility 0x25CC) < 0x25CC :otf=tel2=blwf+ >)
     (".+" [ :otf=tel2=blwf+ ])))

("." =))
  *))

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

("." =))
  *))

;; Stage 3
;; Presentation forms
(generator
 (0
  (cond
   (" ([^ ]+) "
    | (1 :otf=tel2=pres,abvs,blws,psts,haln,calt+) |)

("." =))
  *))

;; Stage 4
;; Remove ZWNJ/ZWJ
(generator
 (0
  (cond
   ("[NJ]")

("." =))
  *))

;; Stage 5
;; GPOS processing
(generator
 (0
  (cond
   (" ([^ ]+) "
    (1 :otf=tel2=+kern,dist,abvm,blwm))

("." =))
  *))

;; Copyright (C) 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: