;; TELU-OTF.flt -- Font Layout Table for Telugu OpenType fonts
-;; Copyright (C) 2004, 2007 AIST (H15PRO112)
+;; Copyright (C) 2004, 2007, 2008, 2010 AIST (H15PRO112)
;; See the end for copying conditions.
(font layouter telu-otf nil
- (font (nil nil unicode-bmp :otf=telu=blwf)))
+ (version "1.6.0")
+ (font (nil nil unicode-bmp :otf=telu)))
;;; <li> TELU-OTF.flt
;;;
;;; For Telugu OpenType fonts to draw the Telugu script.
(category
- ;; C: consonant
- ;; H: HALANT
- ;; u: vowel sign (above)
- ;; p: vowel sign (post)
- ;; b: vowel sign (below)
- ;; a: vowel modifier (post)
- ;; V: independent vowel
- ;; N: ZWNJ (ZERO WIDTH NON-JOINER)
- ;; J: ZWJ (ZERO WIDTH JOINER)
- ;; X: generic
- (0x0C00 0x0C7F ?E) ; generic
- (0x0C01 0x0C03 ?a) ; SIGN CANDRABINDU .. VISARGA
+ (0x0C00 0x0C7F ?X) ; generic
+ (0x0C01 0x0C03 ?A) ; SIGN CANDRABINDU .. VISARGA
(0x0C05 0x0C14 ?V) ; LETTER A .. AU
(0x0C15 0x0C39 ?C) ; LETTER KA .. HA
- (0x0C3E 0x0C40 ?u) ; VOWEL SIGN AA .. II
- (0x0C41 0x0C44 ?p) ; VOWEL SIGN U .. VOCALIC RR
+ (0x0C3E 0x0C42 ?u) ; VOWEL SIGN AA .. II
+ (0x0C43 0x0C44 ?p) ; VOWEL SIGN U .. VOCALIC RR
(0x0C46 0x0C47 ?u) ; VOWEL SIGN E .. EE
(0x0C4A 0x0C4C ?u) ; VOWEL SIGN O .. AU
(0x0C4D ?H) ; SIGN VIRAMA
(0x0C56 ?b) ; AI LENGTH MARK
(0x0C58 0x0C59 ?C) ; LETTER TSA .. DZA
(0x0C60 0x0C61 ?V) ; LETTER VOCALIC RR .. VOCALIC LL
- (0x0C62 0x0C63 ?b) ; VOWEL SIGN VOCALIC L .. LL
- (0x0964 0x0965 ?X) ; DANDA .. DOUBLE DANDA
+ (0x0C62 0x0C63 ?b) ; VOWEL SIGN VOCALIC L .. VOCALIC LL
+
(0x200C ?N) ; ZWNJ
(0x200D ?J) ; ZWJ
+ (0x25CC ?X) ; DOTTED CIRCLE
+
+ (blwf ?B)
)
-;; Decompose two-part vowels.
+;; Stage 0
+;; Preprocessing
(generator
(0
(cond
+ ;; Decompose two-part vowel signs.
((0x0C48)
0x0C46 0x0C56)
+
+ ("." =))
+ *))
+
+;; Stage 1
+;; Syllable identification
+(generator
+ (0
+ (cond
+ ;; Consonant-based syllables
+ ;;1 23 4
+ ("(C((J?H|HJ?)C)*)(H[NJ]?|u?b?p?A?)"
+ < |
+ (cond
+ (".+HJ$" :otf=telu=nukt,akhn+)
+ ("(.+)(H)N?$" (1 :otf=telu=nukt,akhn+) (2 =) 0x200C)
+ (".+" :otf=telu=nukt,akhn+))
+ | >)
+
+ ;; Syllables with an independent vowel
+ ;;1 2 3
+ ("(V)(J?HC)?(u?b?p?A?)"
+ < | (1 =) (2 :otf=telu=blwf+) (3 = *) | >)
+
+ ;; Two-part vowel signs
+ ((0x0C46 0x0C56)
+ (cond
+ ((font-facility 0x25CC) < 0x25CC = = >)
+ (".+" [ 0x0C48 ])))
+
+ ;; Combining marks are displayed with a DOTTED CIRCLE.
+ ("[HubpA]"
+ (cond
+ ((font-facility 0x25CC) < 0x25CC = >)
+ ("." [ = ])))
+
+ ;; Isolated blwf is displayed with a DOTTED CIRCLE in the
+ ;; next stage.
+ ("(J)(H)(C)"
+ < | (1 =) (3 =) (2 = ) | >)
+
("." =))
*))
-;; Syllable identification and reordering. The base consonant is
-;; always the first one, because all Telugu consonants have a below
-;; form.
+;; Stage 2
+;; Reorder halant for blwf
(generator
(0
(cond
- ;; A syllable with a vowel sign.
- ;;1 23 4 5
- ("(C)((HC)*)(ub?|p)(a)?"
- < | (1 =) (2 move-h) (4 = *) (5 =) | >)
-
- ;; A syllable with a vowel modifier.
- ;;1 23 4
- ("(C)((HC)*)(a)"
- < | (1 =) (2 move-h) (4 =) | >)
-
- ;; No vowel signs, no vowel modifiers. If the syllable ends with a
- ;; Halant, cancel the Halant movement.
- ;;1 23 4
- ("(C)((HC)*)(HN?)?"
- < | (1 =) (4 0x0C4D) (2 move-h) | >)
-
- ;; A syllable starting with an independent vowel.
- ("Va?"
- < | = * | >)
+ ;; Isolated blwf
+ (" J(CH) "
+ (cond
+ ((font-facility 0x25CC) < 0x25CC (1 :otf=telu=blwf+) >)
+ (" J(CH) " [ (1 :otf=telu=blwf+) ])))
+
+ ;; Syllables with an overt halant
+ (" ([^ ]+)(HN) "
+ | (1 reorder *) (2 = =) |)
+
+ ;; Ordinary syllables
+ (" ([^ubpA ]+)(u?b?p?A?) "
+ | (1 reorder *) (2 = *) |)
("." =))
*)
- (move-h
+ (reorder
(cond
- ("(H)(.+)"
- (2 = *) (1 =)))))
+ ("J?(H)(C)"
+ (2 =) (1 =))
+ ("." =)))
+ )
+
+;; Stage 3
+;; Language forms
+;; Although all consonants have a blow form and none has a half form,
+;; we have to prevent the first consonant from forming the below form.
+(generator
+ (0
+ (cond
+ ;; Overt halant forms
+ (" ([^ ]+)(HN) "
+ |
+ (1 (cond ("(.H)J?(.*)" (1 :otf=telu=half+) (2 lang-forms *))
+ (".+" lang-forms *)))
+ (2 = =) |)
+
+ ;; Other syllables
+ (" ([^ubpA ]*)(u?b?p?A?) "
+ |
+ (1 (cond ("(.H)J?(.*)" (1 :otf=telu=half+) (2 lang-forms *))
+ (".+" lang-forms *)))
+ (2 = *) |)
+
+ ("." =))
+ *)
+
+ (lang-forms
+ (cond
+ ("(.H)J" (1 :otf=telu=half+))
+ (".H" :otf=telu=blwf,half+)
+ ("." =)))
+ )
-;; Apply OTF features. In case of Telugu, 'akhn' is applied after
-;; reordering.
+;; Stage 4
+;; Move subscript glyphs
(generator
(0
(cond
- ;; A syllable that ends with a Halant.
- (" (CH)([^ ]*) "
- (1 otf:telu=haln+) (2 otf:telu=akhn,blwf,abvs,blws,psts+abvm,blwm,dist))
+ (" ([^B ]*[^BJ])J?(B*)(ub?|b)([^ ]*) "
+ | (1 = *) (3 = *) (2 = *) (4 = *) |)
- ;; Ordinary syllables.
+ ("." =))
+ *))
+
+;; Stage 5
+;; Presentation forms
+(generator
+ (0
+ (cond
+ (" ([^ ]+) "
+ | (1 :otf=telu=pres,abvs,blws,psts,haln+) |)
+
+ ("." =))
+ *))
+
+;; Stage 6
+;; Remove ZWNJ/ZWJ
+(generator
+ (0
+ (cond
+ ("[NJ]")
+
+ ("." =))
+ *))
+
+;; Stage 7
+;; GPOS processing
+(generator
+ (0
+ (cond
(" ([^ ]+) "
- (1 otf:telu=akhn,blwf,abvs,blws,psts+absm,blwm,dist))
+ (1 :otf=telu=+abvm,blwm,dist))
- ("."
- [ = ]))
+ ("." =))
*))
-;; Copyright (C) 2004, 2007
+;; Copyright (C) 2004, 2007, 2008, 2010
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H15PRO112
projects / m17n / m17n-db.git / blobdiff