From: ntakahas <ntakahas>
Date: Fri, 17 Aug 2007 05:01:21 +0000 (+0000)
Subject: Rewritten with new algorithm.
X-Git-Tag: REL-1-5-0~74
X-Git-Url: http://git.chise.org/gitweb/?a=commitdiff_plain;h=e5f7c8b0c56ff558a79c41eed5d082572fc2791d;p=m17n%2Fm17n-db.git

Rewritten with new algorithm.
---

diff --git a/FLT/TAML-OTF.flt b/FLT/TAML-OTF.flt
index 8e18a5f..fa3347b 100644
--- a/FLT/TAML-OTF.flt
+++ b/FLT/TAML-OTF.flt
@@ -23,97 +23,84 @@
 
 ;;; <li> TAML-OTF.flt
 ;;;
-;;; For Tamil OpenType fonts to draw Tamil.
-;;; Fonts are available from <http://sourceforge.net/projects/tamillinux/>.
+;;; For Tamil OpenType fonts to draw the Tamil script.
 
 (font layouter taml-otf nil
       (font (nil nil unicode-bmp :otf=taml=akhn)))
 
 (category
- ;; C: general consonant
- ;; V: independent vowel
+ ;; C: consonant
  ;; H: HALANT
- ;; m: MATRA (pre)
- ;; u: MATRA (above)
- ;; b: MATRA (below)
- ;; p: MATRA (post)
- ;; A: vowel modifier (above)
- ;; a: vowel modifier (post)
- ;; N: ZWNJ (ZERO WIDTH NON-JOINER)
- ;; J: ZWJ (ZERO WIDTH JOINER)
- ;; E: ELSE
- ;;
+ ;; m: vowel sign (pre)
+ ;; u: vowel sign (above)
+ ;; b: vowel sign (below)
+ ;; p: vowel sign (post)
+ ;; X: generic
+ (0x0B80 0x0BFF	?X)			; generic
+ (0x0B95 0x0BB9 ?C)			; LETTER KA .. HA
+ (0x0BBE 0x0BBF	?p)			; VOWEL SIGN AA .. I
+ (0x0BC0	?u)			; VOWEL SIGN II
+ (0x0BC1 0x0BC2	?b)			; VOWEL SIGN U .. UU
+ (0x0BC6 0x0BC8	?m)			; VOWEL SIGN E .. AI
+ (0x0BCD	?H)			; SIGN VIRAMA
+ (0x0BD7	?p)			; AU LENGTH MARK
+ (0x0964 0x0965	?X)			; DANDA .. DOUBLE DANDA
  (0x200C	?N)			; ZWNJ
- (0x200D	?J)			; ZWJ
- (0x0964	?E)			; DANDA
- (0x0965	?E)			; DOUBLE DANDA
- (0x0B80 0x0BFF	?E)			; ELSE
- (0x0B85 0x0B94	?V)			; LETTER AA .. LETTER AU
- (0x0B95 0x0BB9 ?C)			; LETTER KA .. LETTER HA
- (0x0BBE 	?p)			; VOWEL SIGN AA (post)
- (0x0BBF	?p)			; VOWEL SIGN I (post)
- (0x0BC0	?u)			; VOWEL SIGN II (above)
- (0x0BC1 	?b)			; VOWEL SIGN U (below)
- (0x0BC2	?b)			; VOWEL SIGN UU (below)
- (0x0BC6 0x0BC8	?m)			; VOWEL SIGN E, EE, AI (pre)
- (0x0BCA 0x0BCC	?t)			; VOWEL SIGN O, OO, AU (two-part)
- (0x0BCD	?H)			; VIRAMA
- (0x0BD7	?p)			; AU LENGTH MARK (post)
  )
 
-;; Step 1 : Syllable identification.
+;; Preprocessing.
 (generator
  (0
   (cond
-   ;; Special ligature SRI
-   ((0x0BB8 0x0BCD 0x0BB0 0x0BC0)
-    otf:taml=akhn)
-
-   ;; A syllable ending with a two-part vowel sign.
-   ("((CH)*C)(t)"
-    < | (1 otf:taml=akhn) (3 two-part) | >)
-
-   ;; A syllable ending with a vowel sign.
-   ("((CH)*C)([mubp])"
-    < | (1 otf:taml=akhn) (3 =) | >)
-
-   ;; No vowel sign.
-   ("(CH)*CH?"
-    < | otf:taml=akhn | >)
-
+   ;; Decompose two-part vowel signs.
+   ((0x0BCA)
+    0x0BC6 0x0BBE)
+   ((0x0BCB)
+    0x0BC7 0x0BBE)
+   ((0x0BCC)
+    0x0BC6 0x0BD7)
    ;; A variation of AU.
    ((0x0B92 0x0BD7)
     0x0B94)
-
+   ;; TAMu and TSCu fonts generate the SRI ligature with 'akhn'.
+   ;; (lohit and latha do it with 'half' + 'abvs'.)
+   ((0x0BB8 0x0BCD 0x0BB0 0x0BC0)
+    otf:taml=akhn+)
    ("." =))
-  *)
+  *))
 
- (two-part
+;; Syllable identification.
+(generator
+ (0
   (cond
-   ((0x0BCA)
-    0x0BC6 0x0BBE)
-   ((0x0BCB)
-    0x0BC7 0x0BBE)
-   ((0x0BCC)
-    0x0BC6 0x0BD7))))
+   ;; A syllable with vowel signs.
+   ("((CH)*C)(m|b|u|p|mp)"
+    < | (1 otf:taml=akhn,half+) (3 = *) | >)
+
+   ;; No vowel signs.
+   ("((CH)*C)(H)?N?"
+    < | (1 otf:taml=akhn,half+) (3 =) | >)
+
+   ("." =))
+  *))
 
-;; Step 2 : Matra movements.
+;; Move Matra before the base consonant.
 (generator
  (0
   (cond
-   (" ([^ mubp]*)([^ mubp])(m)?([ubp])? "
+   (" ([^ m]*)([^ m])(m)(p)? "
     | (1 = *) (3 =) (2 =) (4 =) |)
    ("." =))
   *))
 
-;; Step 3 : OTF substitutions and positionings.
+;; Apply other OTF features.
 (generator
  (0
   (cond
-   (" ([^ ]*) "
-    (1 otf:taml))
+   (" ([^ ]+) "
+    (1 otf:taml=pres,abvs,blws,psts,haln+abvm,blwm,dist))
    ("."
-    [ otf:taml=+ ]))
+    [ = ]))
   *))
 
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