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| Current File : //usr/share/m17n/BNG2-OTF.flt |
;; 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: