-;; DEVA-OTF.flt -- Font Layout Table for Devanagari OpenType font
-;; Copyright (C) 2003, 2004, 2007 AIST (H15PRO112)
+;; DEVA-OTF.flt -- Font Layout Table for Devanagari OpenType fonts
+;; Copyright (C) 2003, 2004, 2007, 2008, 2010 AIST (H15PRO112)
;; See the end for copying conditions.
(font layouter deva-otf nil
- (font (nil nil unicode-bmp :otf=deva=rphf)))
+ (version "1.6.0")
+ (font (nil nil unicode-bmp :otf=deva)))
;;; <li> DEVA-OTF.flt
;;;
;;; For Devanagari OpenType fonts to draw the Devanagari script.
+;; Accepted modifier sequence:
+;; 1. matra (pre, below, above, post)
+;; 2. candrabindu (0901) or anusvara (0902)
+;; 3. udatta (0951) or anudatta (0952)
+;; 4. grave (0953) or acute (0954)
+;; 5. visarga (0903)
+
+;; Rendering glyph order:
+;; 1. below matra
+;; 2. anudatta (0952)
+;; 3. above- or post matra
+;; 4. reph
+;; 5. candrabindu (0901) or anusvara (0902)
+;; 6. udatta (0951)
+;; 7. visarga (0903)
+
(category
;; X: generic
+ ;; V: independent vowel
;; C: consonant (except for RA)
;; R: consonant RA
;; n: NUKTA
;; u: vowel sign (above)
;; b: vowel sign (below)
;; p: vowel sign (post)
- ;; A: vowel modifier (above)
- ;; a: vowel modifier (post)
- ;; S: stress sign / accent (above)
- ;; s: stress sign / accent (below)
- ;; V: independent vowel
+ ;; a: vowel modifier (above)
+ ;; A: vowel modifier (post)
+ ;; s: stress sign / accent (above)
+ ;; S: stress sign (below)
;; Z: internal use
;; N: ZWNJ
;; J: ZWJ
(0x0900 0x097F ?X) ; generic
- (0x0900 ?Z) ; internal use
- (0x0901 0x0902 ?A) ; SIGN CANDRABINDU .. ANUSVARA
- (0x0903 ?a) ; SIGN VISARGA
+ (0x0900 0x0902 ?a) ; SIGN INVERTED CANDRABINDU .. ANUSVARA
+ (0x0903 ?A) ; SIGN VISARGA
(0x0904 0x0914 ?V) ; LETTER SHORT A .. AU
(0x0915 0x0939 ?C) ; LETTER KA .. HA
(0x0930 ?R) ; LETTER RA
(0x0945 0x0948 ?u) ; VOWEL SIGN CANDRA E .. AI
(0x0949 0x094C ?p) ; VOWEL SIGN CANDRA O .. AU
(0x094D ?H) ; SIGN VIRAMA
- (0x0951 ?S) ; STRESS SIGN UDATTA
- (0x0952 ?s) ; STRESS SIGN ANUDATTA
- (0x0953 0x0954 ?S) ; GRAVE ACCENT .. ACUTE ACCENT
+ (0x094E ?m) ; VOWEL SIGN PRISHTHAMATRA E
+ (0x0951 ?s) ; STRESS SIGN UDATTA
+ (0x0952 ?S) ; STRESS SIGN ANUDATTA
+ (0x0953 0x0954 ?t) ; GRAVE ACCENT .. ACUTE ACCENT
+ (0x0955 ?u) ; VOWEL SIGN CHANDRA LONG E
(0x0958 0x095F ?C) ; LETTER QA .. YYA
(0x0960 0x0961 ?V) ; LETTER VOCALIC RR .. VOCALIC LL
(0x0962 0x0963 ?b) ; VOWEL SIGN VOCALIC L .. VOCALIC LL
- (0x097B 0x097C ?C) ; LETTER GGA .. JJA
- (0x097E 0x097F ?C) ; LETTER DDDA .. BBA
+ (0x0972 ?V) ; LETTER CANDRA A
+ (0x0979 0x097F ?C) ; LETTER ZHA .. BBA
+
(0x200C ?N) ; ZWNJ
(0x200D ?J) ; ZWJ
+ (0x25CC ?X) ; DOTTED CIRCLE
+
+ (rphf ?r)
)
;; Stage 0
-;; Compose consonant and nukta
+;; Preprocessing
(generator
(0
(cond
+ ;; Compose a consonant and a nukta
((0x0928 0x093C) 0x0929)
((0x0930 0x093C) 0x0931)
((0x0933 0x093C) 0x0934)
((0x0922 0x093C) 0x095D)
((0x092B 0x093C) 0x095E)
((0x092F 0x093C) 0x095F)
+
("." =))
*))
;; Stage 1
-;; Syllable identification and eordering.
+;; Syllable identification
+(generator
+ (0
+ (cond
+ ;; Syllables with an independent vowel
+ ;;
+ ("(RH)?(Vn?)((J?HR)?m?u?b?p?n?a?[sS]?t?A?)"
+ < | (1 = =) (2 :otf=deva=nukt+) (3 = *) | >)
+
+ ;; Consonant-based syllables
+ ;;1 23 4
+ ("([CR]n?((J?H|HJ?)[CR]n?)*)(H[NJ]?|m?u?b?p?n?a?[sS]?t?A?)"
+ < |
+ (cond
+ (".+HJ$" :otf=deva=nukt,akhn+)
+ ("(.+)(H)N?$" (1 :otf=deva=nukt,akhn+) (2 =) 0x200C)
+ (".+" :otf=deva=nukt,akhn+))
+ | >)
+
+ ;; Combining marks are displayed with a DOTTED CIRCLE.
+ ("m"
+ (cond
+ ((font-facility 0x25CC) < = 0x25CC >)
+ ("." [ = ])))
+ ("[nHubpaSsA]"
+ (cond
+ ((font-facility 0x25CC) < 0x25CC = >)
+ ("." [ = ])))
+
+ ;; Isolated blwf is displayed with a DOTTED CIRCLE in the next stage.
+ ("(J)(H)(R)"
+ < | (1 =) (3 =) (2 =) | >)
+
+ ("." =))
+ *))
+
+;; Stage 2
+;; Reorder halant for blwf
(generator
(0
(cond
- ;; A syllable containing a vowel sign.
- ;;1 2 34 5 6 7 8 9 10
- ("([CR]n?(HJ?[CR]n?)*)((m)|(b)|(u|p))(A)?(a)?(S)?(s)?"
- < | (4 =) (1 move-h) (5 =) (10 =) (6 =) (1 reph) (7 =) (9 =) (8 =) | >)
-
- ;; A syllable without vowel signs but with a vowel modifier.
- ;;1 2 34 5 6 7
- ("([CR]n?(HJ?[CR]n?)*)((A)|(a))(S)?(s)?"
- < | (1 move-h) (7 =) (1 reph) (4 =) (6 =) (5 =) | >)
-
- ;; No vowel signs, No vowel modifiers, but with a stress sign or an accent.
- ;;1 2 34 5
- ("([CR]n?(HJ?[CR]n?)*)((S)|(s))"
- < | (1 move-h) (5 =) (1 reph) (4 =) | >)
-
- ;; No marks at all. Need further anylysis.
- ("[CR]n?(HJ?[CR]n?)*(H(N|J)?)?"
- < | (0 nomarks) | >)
-
- ;; A syllable starting with an independent vowel.
- ;;1 2 3 4 5
- ("(V)(A)?(a)?(S)?(s)?"
- < | (1 =) (5 =) (2 =) (4 =) (3 =) | >)
+ ;; Isolated blwf
+ (" J(RH) "
+ (cond
+ ((font-facility 0x25CC) < 0x25CC :otf=deva=blwf+ >)
+ (" J(RH) " [ (1 :otf=deva=blwf+) ])))
+
+ ;; Syllables with an overt halant
+ (" (RHJ?)?([^ ]+)(HN) "
+ | (1 = *) (2 reorder) (3 = =) |)
+
+ ;; Ordinary syllables
+ (" (RHJ?)?([^mubpasStA ]+)(m?u?b?p?n?a?[sS]?t?A?) "
+ | (1 = *) (2 reorder) (3 = *) |)
("." =))
*)
- (move-h
+ ;; In Devanagari and Gujarati, vattu has a half form. Thus we handle
+ ;; the sequence CHRHC as (CH)half + (RH)blwf + C instead of
+ ;; reordering and interpreting it as C + (RH)blwf + H + C.
+ (reorder
(cond
- ;; Starting with an eyelash-RA, which remains there.
- ("(RHJ.+)(H)(R)$"
- (1 = *) (3 =) (2 =))
- ("RHJ.*"
- = *)
-
- ;; Starting with a reph, which is removed.
- ("RH(.+)(H)(R)$"
- (1 = *) (3 =) (2 =))
- ("RH(.+)"
- (1 = *))
-
- ("(.+)(H)(R)$"
- (1 = *) (3 =) (2 =))
- (".+"
- = *)))
-
- (reph
+ ("(.+)(H)(R)$" (1 = *) (3 =) (2 =))
+ (".+" = *)))
+ )
+
+;; Stage 3
+;; Language forms and matra reordering
+(generator
+ (0
(cond
- ("RHJ.*")
- ("(RH).*"
- (1 otf:deva=rphf+))))
+ ;; Overt halant forms
+ (" (RHJ?)?([^ ]+)(HN) "
+ |
+ (1 (cond ("RHJ" :otf=deva=half+)
+ ("RH" :otf=deva=rphf+)))
+ (2 (cond ("(.H)J?(.*)" (1 :otf=deva=half+) (2 lang-forms *))
+ (".+" lang-forms *)))
+ (3 = =) |)
- (del-reph
+ ;; Other syllables
+ ;; 1 2 3 4 5 6 7 8
+ (" (RHJ?)?([^mubpasStA ]*)(mn?)?(un?)?(bn?)?(p?n?a?)(S)?(s?t?A?) "
+ | (3 = *)
+ (1 (cond ("RHJ" :otf=deva=half+)
+ ("RH" :otf=deva=rphf+)))
+ (2 (cond ("(.H)J?(.*)" (1 :otf=deva=half+) (2 lang-forms *))
+ (".+" lang-forms *)))
+ (5 = *) (7 =) (4 = *) (6 = *) (8 = *) |)
+
+ ("." =))
+ *)
+
+ (lang-forms
(cond
- ("RHJ.*"
- = *)
- ("RH(.*)"
- (1 = *))
- (".+"
- = *)))
-
- (nomarks
+ ("(.H)J" (1 :otf=deva=half+))
+ (".H" :otf=deva=blwf,half+)
+ ("." =)))
+ )
+
+;; Stage 4
+;; Final reordering #1 (Move pre-base matra after the last halant)
+(generator
+ (0
(cond
- ;; Ending with a Halant and a ZWJ.
- (".+HJ$"
- (0 del-reph) (0 reph))
+ ;; 1 2 3
+ (" (mn?)([^ ]+HJ?)([^H ]+) "
+ | (2 = *) (1 = *) (3 = *) |)
+
+ ("." =))
+ *))
- ;; Ending with a Halant and an optional ZWNJ. Add ZWNJ explicitly.
- ("(.+)(H)N?$"
- (1 move-h) (1 reph) (2 =) 0x200C)
+;; 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)([^H ]+HJ?)([^ ]*) "
+ | (1 = *) (3 = *) (2 =) (4 = *) |)
- ;; Ending with a consonant.
- (".+"
- (0 move-h) (0 reph))))
- )
+ ;; A reph without explicit halant
+ ;; 1 2 3 4
+ (" (mn?)?(r)([^astA ]+)(a?s?t?A?) "
+ | (1 = *) (3 = *) (2 =) (4 = *) |)
-;; Stage 2
-;; Apply GSUB features. If a syllable ends with a halant and a ZWNJ,
-;; render the final halant explicitly.
+ ("." =))
+ *))
+
+;; Stage 6
+;; Nukta for matra, vattu and presentation forms
(generator
(0
(cond
- ;; Allow eyelash RA to appear at the beginning.
- (" (RH)J([^ ]+)(H)N "
- | (1 otf:deva=half+) (2 gsub) (3 =) |)
- (" (m)?(RH)J([^ ]*) "
- | (1 =) (2 otf:deva=half+) (3 gsub) |)
-
- ;; Avoid applying 'blwf' and 'half' to the "RH" at the beginning;
- (" (R)([^ ]*)(H)N "
- | (1 =) (2 gsub) (3 =) |)
- (" (m?R)([^ ]*) "
- | (1 otf:deva=pres+) (2 gsub) |)
-
- (" ([^ ]+)(H)N "
- | (1 gsub) (2 =) |)
(" ([^ ]+) "
- | (1 gsub) |)
+ | (1 :otf=deva=nukt,vatu,pres,abvs,blws,psts,haln+) |)
("." =))
- *)
+ *))
- ;; Dispite Rule R5a (The Unicode Standard 5.0, p.305), we use the
- ;; below form to depict the sequence "RHJ" at non-initial positions.
- ;; This is to avoid interpreting the sequence "CHRHJ" as "CH" +
- ;; "RHJ". It should be parsed as "CHR" + "HJ".
- (gsub
+;; Stage 7
+;; Remove ZWNJ/ZWJ
+(generator
+ (0
(cond
- ("([^J]*)J(.*)"
- (1 otf:deva=nukt,akhn,blwf,half,vatu,pres+) (2 gsub))
- (".*"
- otf:deva=nukt,akhn,blwf,half,vatu,pres+)))
- )
+ ("[NJ]")
-;; Stage 3
-;; Apply other features.
+ ("." =))
+ *))
+
+;; Stage 8
+;; GPOS processing
(generator
(0
(cond
(" ([^ ]+) "
- (1 otf:deva=abvs,blws,psts,haln+abvm,blwm,dist))
- ("."
- [ = ]))
+ (1 :otf=deva=+abvm,blwm,dist))
+
+ ("." =))
*))
-;; Copyright (C) 2003, 2004, 2007
+;; Copyright (C) 2003, 2004, 2007, 2008, 2010
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H15PRO112
projects / m17n / m17n-db.git / blobdiff