From 1f2bc92215dee2e8c21a597d266c86764714ca3c Mon Sep 17 00:00:00 2001
From: ntakahas <ntakahas>
Date: Tue, 4 Sep 2007 09:16:43 +0000
Subject: [PATCH] Remove ZWJ's _after_ 'vatu' and 'pres' are applied.

---
 FLT/DEVA-OTF.flt |   51 ++++++++++++++++++++++++++-------------------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/FLT/DEVA-OTF.flt b/FLT/DEVA-OTF.flt
index 6e98d6e..b9ed5d6 100644
--- a/FLT/DEVA-OTF.flt
+++ b/FLT/DEVA-OTF.flt
@@ -73,6 +73,7 @@
  (0x200D	?J)			; ZWJ
  )
 
+;; Stage 0
 ;; Compose consonant and nukta
 (generator
  (0
@@ -91,7 +92,8 @@
    ("." =))
   *))
 
-;; Reordering
+;; Stage 1
+;; Syllable identification and eordering.
 (generator
  (0
   (cond
@@ -158,7 +160,7 @@
 
  (nomarks
   (cond
-   ;; Ending with a Halant and ZWJ.
+   ;; Ending with a Halant and a ZWJ.
    (".+HJ$"
     (0 del-reph) (0 reph))
 
@@ -171,17 +173,9 @@
     (0 move-h) (0 reph))))
  )
 
-;; Apply 'nukt' and 'akhn'.
-(generator
- (0
-  (cond
-   (" ([^ ]+) "
-    | (1 otf:deva=nukt,akhn+) |)
-   ("." =))
-  *))
-
-;; Apply either 'half' or 'blwf' to consonants.  If a syllable ends
-;; with a halant and a ZWNJ, render the final halant explicitly.
+;; Stage 2
+;; Apply GSUB features.  If a syllable ends with a halant and a ZWNJ,
+;; render the final halant explicitly.
 (generator
  (0
   (cond
@@ -191,11 +185,11 @@
    (" (m)?(RH)J([^ ]*) "
     | (1 =) (2 otf:deva=half+) (3 gsub) |)
 
-   ;; Avoid applying 'half' and 'blwf' to the initial RA.
+   ;; Avoid applying 'blwf' and 'half' to the "RH" at the beginning;
    (" (R)(.*)(H)N "
     | (1 =) (2 gsub) (3 =) |)
    (" (m?R)([^ ]*) "
-    | (1 = *) (2 gsub) |)
+    | (1 otf:deva=pres+) (2 gsub) |)
 
    (" (.+)(H)N "
     | (1 gsub) (2 =) |)
@@ -205,24 +199,31 @@
    ("." =))
   *)
 
- ;; Dispite Rule R5a (p.305), we use the below form to depict the
- ;; sequence "RHJ" at a non-initial position.  This is to avoid
- ;; interpreting the sequence "CHRHJ" as "CH" + "RHJ".  It should be
- ;; parsed as "CHR" + "HJ".
+ ;; Dispite Rule R5a (The Unicode Standard 5.0, p.305), we use the
+ ;; below form to depict the sequence "RHJ" at a non-initial position.
+ ;; This is to avoid interpreting the sequence "CHRHJ" as "CH" +
+ ;; "RHJ".  It should be parsed as "CHR" + "HJ".
  (gsub
-  (cond
-   ("(.H)J?(.*)"
-    (1 otf:deva=blwf,half+) (2 gsub))
-   ("(.)(.*)"
-    (1 =) (2 gsub))))
+  otf:deva=nukt,akhn,blwf,half,vatu,pres+)
  )
 
+;; Stage 3
+;; ZWJ's are used to prevent consonant conjuncts, so they are removed
+;; only after 'vatu' and 'pres' have been applied.
+(generator
+ (0
+  (cond
+   ("J")
+   ("." =))
+  *))
+
+;; Stage 4
 ;; Apply other features.
 (generator
  (0
   (cond
    (" ([^ ]+) "
-    (1 otf:deva=vatu,pres,abvs,blws,psts,haln+abvm,blwm,dist))
+    (1 otf:deva=abvs,blws,psts,haln+abvm,blwm,dist))
    ("."
     [ = ]))
   *))
-- 
1.7.10.4