285 lines
6.7 KiB
Plaintext
285 lines
6.7 KiB
Plaintext
;; BNG2-OTF.flt -- Font Layout Table for bng2 OpenType fonts
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;; Copyright (C) 2010 AIST (H15PRO112)
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;; See the end for copying conditions.
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(font layouter bng2-otf nil
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(version "1.6.0")
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(font (nil nil unicode-bmp :otf=bng2)))
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;;; <li> BNG2-OTF.flt
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;;;
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;;; For bng2 OpenType fonts to draw the Bengali script.
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;; It seems that "Shornar Bangla.ttf" is designed to render the bng2
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;; script with the following glyph sequence.
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;; 1. pre matra
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;; 2. half forms and below forms
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;; 3. base glyph
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;; 4. below forms
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;; 5. below matra (09C1..09C4)
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;; 6. reph
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;; 7. post forms
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;; 8. post matra (09C0, 09D7)
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;; 9. candrabindu (0981)
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;; 10. anusvara (0982) or visarga (0983)
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(category
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;; X: generic
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;; V: independent vowel
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;; C: consonant
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;; R: RA
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;; T: KHANDA TA
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;; n: NUKTA
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;; H: HALANT
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;; m: vowel sign (pre)
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;; b: vowel sign (below)
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;; p: vowel sign (post)
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;; a: vowel modifier (above)
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;; A: vowel modifier (post)
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;; N: ZWNJ
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;; J: ZWJ
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(0x0980 0x09FF ?X) ; generic
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(0x0981 ?a) ; SIGN CANDRABINDU
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(0x0982 0x0983 ?A) ; SIGN ANUSVARA .. VISARGA
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(0x0985 0x0994 ?V) ; LETTER A .. AU
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(0x0995 0x09B9 ?C) ; LETTER KA .. HA
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(0x09B0 ?R) ; LETTER RA
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(0x09BC ?n) ; SIGN NUKTA
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(0x09BE ?p) ; VOWEL SIGN AA
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(0x09BF ?m) ; VOWEL SIGN I
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(0x09C0 ?p) ; VOWEL SIGN II
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(0x09C1 0x09C4 ?b) ; VOWEL SIGN U .. RR
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(0x09C7 0x09C8 ?m) ; VOWEL SIGN E .. AI
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(0x09CD ?H) ; SIGN VIRAMA
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(0x09CE ?T) ; LETTER KHANDA TA
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(0x09D7 ?p) ; AU LENGTH MARK
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(0x09DC 0x09DF ?C) ; LETTER RRA .. YYA
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(0x09E0 0x09E1 ?V) ; LETTER VOCALIC RR, LL
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(0x09E2 0x09E3 ?b) ; VOWEL SIGN L .. LL
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(0x09F0 ?R) ; LETTER RA WITH MIDDLE DIAGONAL
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(0x09F1 ?C) ; LETTER RA WITH LOWER DIAGONAL
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(0x200C ?N) ; ZWNJ
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(0x200D ?J) ; ZWJ
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(0x25CC ?X) ; DOTTED CIRCLE
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(rphf ?r)
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(pstf ?P)
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)
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;; Stage 0
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;; Preprocessing
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(generator
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(0
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(cond
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;; Decompose two-part vowel signs.
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((0x09CB)
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0x09C7 0x09BE)
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((0x09CC)
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0x09C7 0x09D7)
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;; TA + HALANT + ZWJ -> KHANDA-TA
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((0x09A4 0x09CD 0x200D)
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0x09CE)
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;; consonant + NUKTA
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((0x09A1 0x09BC)
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0x09DC)
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((0x09A2 0x09BC)
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0x09DD)
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((0x09AF 0x09BC)
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0x09DF)
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("." =))
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*))
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;; Stage 1
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;; Syllable identification
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(generator
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(0
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(cond
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;; Syllables with an independent vowel
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("(RH)?Vn?(J?H[CR])?m?b?p?n?a?A?"
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< | = * | >)
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;; KHANDA-TA combines only with reph.
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("(RH)?(T)"
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< (2 =) (1 :otf=bng2=rphf+) >)
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;; Consonant-based syllables
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("([CR]n?J?HJ?)*[CR]n?(H[NJ]?|m?([NJ]?b)?p?n?)a?A?"
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< | = * | >)
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;; Two-part vowel signs
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((0x09C7 0x09BE)
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(cond
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((font-facility 0x25CC) < 0x09C7 0x25CC 0x09BE >)
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(".+" < 0x09CB >)))
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((0x09C7 0x09D7)
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(cond
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((font-facility 0x25CC) < 0x09C7 0x25CC 0x09D7 >)
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(".+" < 0x09CC >)))
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;; Combining marks are displayed with a DOTTED CIRCLE.
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("m"
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(cond
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((font-facility 0x25CC) < = 0x25CC >)
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("." [ = ])))
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("[nHbpaA]"
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(cond
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((font-facility 0x25CC) < 0x25CC = >)
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("." [ = ])))
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("JH[CR]"
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(cond
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((font-facility 0x25CC) < 0x25CC :otf=bng2=blwf,pstf+ >)
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(".+" [ :otf=bng2=blwf,pstf+ ])))
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("." =))
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*))
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;; Stage 2
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;; Basic shaping forms and matra reordering
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(generator
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(0
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(cond
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;; Explicit halant form starting with RA + H + ZWJ
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(" (RHJ[CRnHJ]+)(HN?a?A?) "
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(1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (1 b4post) (1 post) (2 = *) |)
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;; Explicit halant form starting with a reph
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(" (RH)([CRnHJ]+)(HN?a?A?) "
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(2 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (1 :otf=bng2=rphf+) (2 b4post) (2 post) (3 = *) |)
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;; Other explicit halant forms
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(" ([CRnHJ]+)(HN?a?A?) "
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(1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (1 b4post) (1 post) (2 = *) |)
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;; Ordinary syllables starting with RA + H + ZWJ
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;; 1 2 3 45
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(" (RHJ[CRnHJN]*)(mn?)?(bn?)?((pn?)?a?A?) "
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;; |
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;; This is an asterisk. (See DEV2-OTF.flt)
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(1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (2 = *) (1 b4post) (3 = *) (1 post) (4 = *) |)
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;; Ordinary syllables starting with a reph
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;; 1 2 3 4 56
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(" (RH)([CRnHJVN]+)(mn?)?(bn?)?((pn?)?a?A?) "
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(2 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (3 = *) (1 :otf=bng2=rphf+) (2 b4post) (4 = *) (2 post) (5 = *) |)
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;; Other ordinary syllables
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;; 1 2 3 45
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(" ([CRnHJVN]+)(mn?)?(bn?)?((pn?)?a?A?) "
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(1 :otf?bng2=locl,nukt,akhn,blwf,pstf+)
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| (2 = *) (1 b4post) (3 = *) (1 post) (4 = *) |)
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("." =))
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*)
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(b4post
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(cond
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;;1 23 4
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("([CRnHJP]*[CRV]n?)((J?PP)+)([NJ])?$"
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(1 :otf=bng2=locl,nukt,akhn,blwf,half,vatu,cjct+) (4 =))
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(".+"
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(0 :otf=bng2=locl,nukt,akhn,blwf,half,vatu,cjct+) (4 =))))
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(post
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(cond
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("[CRnHJP]*[CRV]n?((J?PP)+)([NJ])?$"
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(1 :otf=bng2=pstf+))))
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)
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;; Stage 3
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;; Final reordering #1 (Move pre-base matra after the last halant)
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(generator
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(0
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(cond
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;; 1 2 3
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(" (mn?)([^ ]+HJ?)([^H ]+) "
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| (2 = *) (1 = *) (3 = *) |)
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("." =))
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*))
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;; Stage 4
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;; Final reordering #2 (Move reph after the first halant)
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(generator
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(0
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(cond
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;; Syllables with a reph and an explicit halant
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;; 1 2 3 4
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(" (mn?)?(r)([^HP ]+HJ?)([^ ]*) "
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| (1 = *) (3 = *) (2 =) (4 = *) |)
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;; A reph without explicit halant
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;; 1 2 3 4
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(" (mn?)?(r)([^PpaA ]+)(P*H?p?n?a?A?) "
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| (1 = *) (3 = *) (2 =) (4 = *) |)
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("." =))
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*))
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;; Stage 5
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;; Nukta for matra and Presentation forms
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(generator
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(0
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(cond
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(" (mn?)?([^ ]+) "
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| (1 :otf=bng2=nukt,init+)
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(2 :otf=bng2=nukt,pres,abvs,blws,psts,haln,calt+) |)
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("." =))
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*))
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;; Stage 6
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;; Remove ZWNJ/ZWJ
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(generator
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(0
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(cond
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("[NJ]")
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("." =))
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*))
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;; Stage 7
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;; GPOS processing
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(generator
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(0
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(cond
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(" ([^ ]+) "
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(1 :otf=bng2=+kern,dist,abvm,blwm))
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("." =))
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*))
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;; Copyright (C) 2010
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H15PRO112
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;; This file is part of the m17n database; a sub-part of the m17n
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;; library.
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;; The m17n library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public License
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;; as published by the Free Software Foundation; either version 2.1 of
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;; the License, or (at your option) any later version.
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;; The m17n library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with the m17n library; if not, write to the Free
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;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;; Local Variables:
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;; mode: emacs-lisp
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;; End:
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