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;; BENG-OTF.flt -- Font Layout Table for Bengali OpenType fonts
;; Copyright (C) 2004, 2007, 2010 AIST (H15PRO112)
;; See the end for copying conditions.
(font layouter beng-otf nil
(version "1.6.0")
(font (nil nil unicode-bmp :otf=beng)))
;;; <li> BENG-OTF.flt
;;;
;;; For Bengali OpenType fonts to draw the Bengali script.
;; After-base glyph order for rendering:
;; 1. below form consonants
;; 2. below matra
;; 3. reph
;; 4. candrabindu (0981)
;; 5. post form consonants
;; 6. post matra
;; 7. anusvara (0982) and visarga (0983)
(category
;; X: generic
;; V: independent vowel
;; C: consonant
;; B: BA
;; Y: YA
;; 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
(0x09AC ?B) ; LETTER BA
(0x09AF ?Y) ; LETTER YA
(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)
;; Many fonts still do not have KHANDA-TA.
((0x09CE)
(cond
((font-facility 0x09CE) =)
(".+" 0x09A4 0x09CD 0x200D)))
;; 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[BYR])?m?b?p?n?a?A?)"
< | (1 = =) (2 :otf=beng=nukt+) (3 = *) | >)
;; KHANDA-TA combines only with reph.
("(RH)?(T)"
< (2 =) (1 :otf=beng=rphf+) >)
;; Consonant-based syllables
;;1 23 4
("([CBYR]n?((J?H|HJ?)[CBYR]n?)*)(H[NJ]?|m?([NJ]?b)?p?n?a?A?)"
< |
(cond
(".+HJ$" :otf=beng=nukt,akhn+)
("(.+)(H)N?$" (1 :otf=beng=nukt,akhn+) (2 =) 0x200C)
(".+" :otf=beng=nukt,akhn+))
| >)
;; Two-part vowel signs
((0x09C7 0x09BE)
(cond
((font-facility 0x25CC) < = 0x25CC = >)
(".+" [ 0x09CB ])))
((0x09C7 0x09D7)
(cond
((font-facility 0x25CC) < = 0x25CC = >)
(".+" [ 0x09CC ])))
;; Combining marks are displayed with a DOTTED CIRCLE.
("m"
(cond
((font-facility 0x25CC) < = 0x25CC >)
("." [ = ])))
("[nHbpaA]"
(cond
((font-facility 0x25CC) < 0x25CC = >)
("." [ = ])))
;; Isolated blwf and pstf are displayed with a DOTTED CIRCLE in the
;; next stage.
("(J)(H)([BYR])"
< | (1 =) (3 =) (2 =) | >)
("." =))
*))
;; Stage 2
;; Reorder halant for blwf and pstf
(generator
(0
(cond
;; Isolated blwf and pstf
(" J([BYR]H) "
(cond
((font-facility 0x25CC) < 0x25CC (1 :otf=beng=blwf,pstf+) >)
(" J([BYR]H) " [ (1 :otf=beng=blwf,pstf+) ])))
;; Syllables with an overt halant
(" (RHJ?)?([^ ]+)(HN) "
| (1 = *) (2 reorder) (3 = =) |)
;; Syllables with a below matra
(" (RHJ?)?([^mbpaA ]*[^mbpaANJ ])(m?[NJ]?bp?n?a?A?) "
| (1 = *) (2 reorder) (3 = *) |)
;; Other syllables
(" (RHJ?)?([^mbpaA ]+)(m?p?n?a?A?) "
| (1 = *) (2 reorder) (3 = *) |)
("." =))
*)
(reorder
("(.|.+([^YJ]|JY|HJ))((J?HY)*)$"
(1 reorder-BR *) (3 reorder-Y *)))
;; Unlike Devanagari and Gujarati, vattu in Bengali does not have a
;; half form. Therefore the sequence CHRHC can be safely reordered
;; to CRHHC. Same for CHBHC.
(reorder-BR
(cond
("J?(H)([BR])"
(2 =) (1 =))
("." =)))
(reorder-Y
("J?(H)(Y)"
(2 =) (1 =)))
)
;; Stage 3
;; Language forms and matra reordering
(generator
(0
(cond
;; Overt halant forms
(" (RHJ?)?([^ ]+)(HN) "
|
(1 (cond ("RHJ" :otf=beng=half+)
("RH" :otf=beng=rphf+)))
(2 b4post) (2 post) (3 = =) |)
;; Syllables with a below matra
;; 1 2 3 4 5
(" (RHJ?)?([^mb]*[^mbNJ])(mn?)?([NJ]?bn?)(p?n?a?A?) "
| (3 = *)
(1 (cond ("RHJ" :otf=beng=half+)
("RH" :otf=beng=rphf+)))
(2 b4post) (4 = *) (2 post) (5 = *) |)
;; Other syllables
;; 1 2 3 4
(" (RHJ?)?([^mpaA ]*)(mn?)?(p?n?a?A?) "
| (3 = *)
(1 (cond ("RHJ" :otf=beng=half+)
("RH" :otf=beng=rphf+)))
(2 b4post) (2 post) (4 = *) |)
("." =))
*)
(b4post
(cond
("(.H)J?(.*)"
(1 :otf=beng=half+)
(2 ("(.|.+([^YH]|JY|[BR]H))((YH)*)$" (1 lang-forms *))))
("(.|.+([^YH]|JY|[BR]H))((YH)*)"
(1 lang-forms *))))
(lang-forms
(cond
("(.H)J" (1 :otf=beng=half+))
(".H" :otf=beng=blwf,half,vatu+)
("." =)))
(post
("(.|.+([^YH]|JY|[BR]H))((YH)+)$"
(3 :otf=beng=pstf+)))
)
;; Stage 4
;; Final reordering #1 (Move pre-base matra after the last halant)
(generator
(0
(cond
;; 1 2 3
(" (mn?)([^ ]+HJ?)([^H ]+) "
| (2 = *) (1 = *) (3 = *) |)
("." =))
*))
;; Stage 5
;; 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*(HN)?p?n?a?A?) "
| (1 = *) (3 = *) (2 =) (4 = *) |)
("." =))
*))
;; Stage 6
;; Nukta for matra and Presentation forms
(generator
(0
(cond
(" (mn?)?([^ ]+) "
| (1 :otf=beng=nukt,init+) (2 :otf=beng=nukt,pres,abvs,blws,psts,haln+) |)
("." =))
*))
;; Stage 7
;; Remove ZWNJ/ZWJ
(generator
(0
(cond
("[NJ]")
("." =))
*))
;; Stage 8
;; GPOS processing
(generator
(0
(cond
(" ([^ ]+) "
(1 :otf=beng=+abvm,blwm,dist))
("." =))
*))
;; Copyright (C) 2004, 2007, 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: