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Filename : BNG2-OTF.flt
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;; BNG2-OTF.flt -- Font Layout Table for bng2 OpenType fonts
;; Copyright (C) 2010 AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter bng2-otf nil
      (version "1.6.0")
      (font (nil nil unicode-bmp :otf=bng2)))

;;; <li> BNG2-OTF.flt
;;;
;;; For bng2 OpenType fonts to draw the Bengali script.  

;; It seems that "Shornar Bangla.ttf" is designed to render the bng2
;; script with the following glyph sequence.
;; 1. pre matra
;; 2. half forms and below forms
;; 3. base glyph
;; 4. below forms
;; 5. below matra (09C1..09C4)
;; 6. reph
;; 7. post forms
;; 8. post matra (09C0, 09D7)
;; 9. candrabindu (0981)
;; 10. anusvara (0982) or visarga (0983)

(category
 ;; X: generic
 ;; V: independent vowel
 ;; C: consonant
 ;; R: RA
 ;; T: KHANDA TA
 ;; n: NUKTA
 ;; H: HALANT
 ;; m: vowel sign (pre)
 ;; b: vowel sign (below)
 ;; p: vowel sign (post)
 ;; a: vowel modifier (above)
 ;; A: vowel modifier (post)
 ;; N: ZWNJ
 ;; J: ZWJ
 (0x0980 0x09FF	?X)			; generic
 (0x0981	?a)			; SIGN CANDRABINDU
 (0x0982 0x0983	?A)			; SIGN ANUSVARA .. VISARGA
 (0x0985 0x0994	?V)			; LETTER A .. AU
 (0x0995 0x09B9	?C)			; LETTER KA .. HA
 (0x09B0	?R)			; LETTER RA
 (0x09BC	?n)			; SIGN NUKTA
 (0x09BE	?p)			; VOWEL SIGN AA
 (0x09BF	?m)			; VOWEL SIGN I
 (0x09C0	?p)			; VOWEL SIGN II
 (0x09C1 0x09C4	?b)			; VOWEL SIGN U .. RR
 (0x09C7 0x09C8	?m)			; VOWEL SIGN E .. AI
 (0x09CD	?H)			; SIGN VIRAMA
 (0x09CE	?T)			; LETTER KHANDA TA
 (0x09D7	?p)			; AU LENGTH MARK
 (0x09DC 0x09DF	?C)			; LETTER RRA .. YYA
 (0x09E0 0x09E1	?V)			; LETTER VOCALIC RR, LL
 (0x09E2 0x09E3	?b)			; VOWEL SIGN L .. LL
 (0x09F0	?R)			; LETTER RA WITH MIDDLE DIAGONAL
 (0x09F1	?C)			; LETTER RA WITH LOWER DIAGONAL

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

 (rphf		?r)
 (pstf		?P)
 )

;; Stage 0
;; Preprocessing
(generator
 (0
  (cond
   ;; Decompose two-part vowel signs.
   ((0x09CB)
    0x09C7 0x09BE)
   ((0x09CC)
    0x09C7 0x09D7)

   ;; TA + HALANT + ZWJ -> KHANDA-TA
   ((0x09A4 0x09CD 0x200D)
    0x09CE)

   ;; consonant + NUKTA
   ((0x09A1 0x09BC)
    0x09DC)
   ((0x09A2 0x09BC)
    0x09DD)
   ((0x09AF 0x09BC)
    0x09DF)

   ("." =))
  *))

;; Stage 1
;; Syllable identification
(generator
 (0
  (cond
   ;; Syllables with an independent vowel
   ("(RH)?Vn?(J?H[CR])?m?b?p?n?a?A?"
    < | = * | >)

   ;; KHANDA-TA combines only with reph.
   ("(RH)?(T)"
    < (2 =) (1 :otf=bng2=rphf+) >)

   ;; Consonant-based syllables
   ("([CR]n?J?HJ?)*[CR]n?(H[NJ]?|m?([NJ]?b)?p?n?)a?A?"
    < | = * | >)

   ;; Two-part vowel signs
   ((0x09C7 0x09BE)
    (cond
     ((font-facility 0x25CC) < 0x09C7 0x25CC 0x09BE >)
     (".+" < 0x09CB >)))
   ((0x09C7 0x09D7)
    (cond
     ((font-facility 0x25CC) < 0x09C7 0x25CC 0x09D7 >)
     (".+" < 0x09CC >)))

   ;; Combining marks are displayed with a DOTTED CIRCLE.
   ("m"
    (cond
     ((font-facility 0x25CC) < = 0x25CC >)
     ("." [ = ])))
   ("[nHbpaA]"
    (cond
     ((font-facility 0x25CC) < 0x25CC = >)
     ("." [ = ])))
   ("JH[CR]"
    (cond
     ((font-facility 0x25CC) < 0x25CC :otf=bng2=blwf,pstf+ >)
     (".+" [ :otf=bng2=blwf,pstf+ ])))

   ("." =))
  *))

;; Stage 2
;; Basic shaping forms and matra reordering
(generator
 (0
  (cond
   ;; Explicit halant form starting with RA + H + ZWJ
   (" (RHJ[CRnHJ]+)(HN?a?A?) "
    (1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (1 b4post) (1 post) (2 = *) |)

   ;; Explicit halant form starting with a reph
   (" (RH)([CRnHJ]+)(HN?a?A?) "
    (2 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (1 :otf=bng2=rphf+) (2 b4post) (2 post) (3 = *) |)

   ;; Other explicit halant forms
   (" ([CRnHJ]+)(HN?a?A?) "
    (1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (1 b4post) (1 post) (2 = *) |)

   ;; Ordinary syllables starting with RA + H + ZWJ
   ;; 1             2     3     45
   (" (RHJ[CRnHJN]*)(mn?)?(bn?)?((pn?)?a?A?) "
    ;;            |
    ;; This is an asterisk.  (See DEV2-OTF.flt)
    (1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (2 = *) (1 b4post) (3 = *) (1 post) (4 = *) |)

   ;; Ordinary syllables starting with a reph
   ;; 1   2           3     4     56
   (" (RH)([CRnHJVN]+)(mn?)?(bn?)?((pn?)?a?A?) "
    (2 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (3 = *) (1 :otf=bng2=rphf+) (2 b4post) (4 = *) (2 post) (5 = *) |)

   ;; Other ordinary syllables
   ;; 1           2     3     45
   (" ([CRnHJVN]+)(mn?)?(bn?)?((pn?)?a?A?) "
    (1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
    | (2 = *) (1 b4post) (3 = *) (1 post) (4 = *) |)

   ("." =))
  *)

 (b4post
  (cond
   ;;1                 23       4
   ("([CRnHJP]*[CRV]n?)((J?PP)+)([NJ])?$"
    (1 :otf=bng2=locl,nukt,akhn,blwf,half,vatu,cjct+) (4 =))
   (".+"
    (0 :otf=bng2=locl,nukt,akhn,blwf,half,vatu,cjct+) (4 =))))

 (post
  (cond
   ("[CRnHJP]*[CRV]n?((J?PP)+)([NJ])?$"
    (1 :otf=bng2=pstf+))))
 )

;; Stage 3
;; Final reordering #1 (Move pre-base matra after the last halant)
(generator
 (0
  (cond
   ;; 1    2         3
   (" (mn?)([^ ]+HJ?)([^H ]+) "
    | (2 = *) (1 = *) (3 = *) |)

   ("." =))
  *))

;; Stage 4
;; Final reordering #2 (Move reph after the first halant)
(generator
 (0
  (cond
   ;; Syllables with a reph and an explicit halant
   ;; 1     2  3           4
   (" (mn?)?(r)([^HP ]+HJ?)([^ ]*) "
    | (1 = *) (3 = *) (2 =) (4 = *) |)

   ;; A reph without explicit halant
   ;; 1     2  3          4
   (" (mn?)?(r)([^PpaA ]+)(P*H?p?n?a?A?) "
    | (1 = *) (3 = *) (2 =) (4 = *) |)

   ("." =))
  *))

;; Stage 5
;; Nukta for matra and Presentation forms
(generator
 (0
  (cond
   (" (mn?)?([^ ]+) "
    | (1 :otf=bng2=nukt,init+)
    (2 :otf=bng2=nukt,pres,abvs,blws,psts,haln,calt+) |)

   ("." =))
  *))

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

   ("." =))
  *))

;; Stage 7
;; GPOS processing
(generator
 (0
  (cond
   (" ([^ ]+) "
    (1 :otf=bng2=+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: