Aurora

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;; MLM2-OTF.flt -- Font Layout Table for mlm2 OpenType fonts
;; Copyright (C) 2010 AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter mlm2-otf nil
      (version "1.6.0")
      (font (nil nil unicode-bmp :otf=mlm2)))

;;; <li> MLM2-OTF.flt
;;;
;;; For mlm2 OpenType fonts to draw the Malayalam script.

;; Observed behaviour of Uniscribe in combination with kartika.ttf:

;; 1. Only the last RA can take the pref form.  This last RA can come
;;  a) just before blwf consonants
;;  b) between blwf consonants and pstf consonants, or
;;  c) after pstf consonants.

;; 2. Multiple blwf forms are allowed anywhere in a syllable as long
;; as the context (the combination of the preceding consonant and the
;; blwf consonant) permits.

;; 3. Multiple pstf forms are allowed as long as they are the last
;; consonants, optionally followed by a RA.

;; About chillu letters:

;; The sequence "consonant + VIRAMA + ZWJ" represents a chillu letter,
;; which makes an independent syllable.  The only exception is "CHILLU
;; N + RRA" (0D7B 0D31) and its equivalent "NA + VIRAMA + ZWJ + RRA"
;; (0D28 0D4D 200D 0D31), which make a ligature.

(category
 (0x0D00 0x0D7F	?X)			; generic
 (0x0D02 0x0D03	?A)			; SIGN ANUSVARA .. VISARGA
 (0x0D05 0x0D14	?V)			; LETTER A .. AU
 (0x0D15 0x0D39	?C)			; LETTER KA .. HA
 (0x0D3E 0x0D44	?p)			; VOWEL SIGN AA .. VOCALIC RR
 (0x0D46 0x0D48	?m)			; VOWEL SIGN E .. AI
 (0x0D4D	?H)			; SIGN VIRAMA
 (0x0D57	?p)			; AU LENGTH MARK
 (0x0D60 0x0D61	?V)			; LETTER VOCALIC RR .. VOCALIC LL
 (0x0D62 0x0D63 ?b)			; VOWEL SIGN VOCALIC L .. LL

(0x200C	?N)			; ZWNJ
 (0x200D	?J)			; ZWJ
 (0x25CC	?X)			; DOTTED CIRCLE

(akhn		?C)
 (blwf		?B)
 (pstf		?P)
 (pref		?R)
 )

;; Stage 0
;; Preprocessing
(generator
 (0
  (cond
   ;; Decompose two-part vowel signs
   ((0x0D4A) 0x0D46 0x0D3E)
   ((0x0D4B) 0x0D47 0x0D3E)
   ((0x0D4C) 0x0D46 0x0D57)

;; Replace CHILLU N + RRA with a pseudo-consonant
   ((0x0D7B 0x0D31) :otf=mlm2=akhn+)
   ((0x0D28 0x0D4D 0x200D 0x0D31) :otf=mlm2=akhn+)

;; Other chillu letters
   ((0x0D23 0x0D4D 0x200D) 0x0D7A)
   ((0x0D28 0x0D4D 0x200D) 0x0D7B)
   ((0x0D30 0x0D4D 0x200D) 0x0D7C)
   ((0x0D32 0x0D4D 0x200D) 0x0D7D)
   ((0x0D33 0x0D4D 0x200D) 0x0D7E)
   ((0x0D15 0x0D4D 0x200D) 0x0D7F)

("." =))
  *))

;; Stage 1
;; Syllable identification
(generator
 (0
  (cond
   ;; Consonant-based syllables
   ("(CJ?HJ?)*C(H[NJ]?|m?b?p?)A?"
    < | = * | >)

;; Syllables with an independent vowel
   ("V(J?HC)?m?b?p?A?"
    < | = * | >)

;; Two-part vowel signs
   ((0x0D46 0x0D3E)
    (cond
     ((font-facility 0x25CC) < 0x0D46 0x25CC 0x0D3E >)
     (".+" < 0x0D4A >)))
   ((0x0D47 0x0D3E)
    (cond
     ((font-facility 0x25CC) < 0x0D47 0x25CC 0x0D3E >)
     (".+" < 0x0D4B >)))
   ((0x0D46 0x0D57)
    (cond
     ((font-facility 0x25CC) < 0x0D46 0x25CC 0x0D57 >)
     (".+" < 0x0D4C >)))

;; Combining marks are displayed with a DOTTED CIRCLE.
   ("m"
    (cond
     ((font-facility 0x25CC) < = 0x25CC >)
     ("." [ = ])))
   ("[HbpA]"
    (cond
     ((font-facility 0x25CC) < 0x25CC = >)
     ("." [ = ])))
   ((0x200D 0x0D4D 0x0D30)
    (cond
     ((font-facility 0x25CC) < :otf=mlm2=pref+ 0x25CC >)
     (".+" [ :otf=mlm2=pref+ ])))
   ("JHC"
    (cond
     ((font-facility 0x25CC) < 0x25CC :otf=mlm2=blwf,pstf+ >)
     (".+" [ :otf=mlm2=blwf,pstf+ ])))

("." =))
  *))

;; Stage 2
;; Basic shaping forms and matra reordering
(generator
 (0
  :otf?mlm2=locl,akhn,pref,blwf,pstf+

(cond
   ;; pref after pstf
   ;; 1                23         4   5        6   7
   (" ([CRBPHJ]*[CRBV])((J?PP)*)J?(RR)(H[NJ]?)?(m)?(b?p?A?) "
    | (6 =) (4 :otf=mlm2=pref+) (1 :otf=mlm2=locl,akhn,blwf,half,cjct+)
    (2 :otf=mlm2=pstf+) (5 = *) (7 = *) |)

;; pref between blwf and pstf
   ;; 1           2   34       5        6   7
   (" ([CRBPHJV]+)(RR)((J?PP)+)(H[NJ]?)?(m)?(b?p?A?) "
    | (6 =) (2 :otf=mlm2=pref+) (1 :otf=mlm2=locl,akhn,blwf,half,cjct+)
    (3 :otf=mlm2=pstf+) (5 = *) (7 = *) |)

;; pref before blwf
   ;; 1           2   34       56       7        8   9
   (" ([CRBPHJV]+)(RR)((J?BB)+)((J?PP)*)(H[NJ]?)?(m)?(b?p?A?) "
    | (8 =) (2 :otf=mlm2=pref+) (1 :otf=mlm2=locl,akhn,blwf,half,cjct+)
    (3 :otf=mlm2=blwf+) (5 :otf=mlm2=pstf+) (7 = *) (9 = *) |)

;; no pref
   ;; 1                23       4        5   6
   (" ([CRBPHJ]*[CRBV])((J?PP)*)(H[NJ]?)?(m)?(b?p?A?) "
    | (5 =) (1 :otf=mlm2=locl,akhn,blwf,half,cjct+) (2 :otf=mlm2=pstf+)
    (4 = *) (6 = *) |)

("." =))
  *))

;; Stage 3
;; Final reordering (Move pre-base matra and pre-base RA after the last halant)
(generator
 (0
  (cond
   ;; 1     2       3
   (" (m?R?)([^ ]+H)([^H ]+) "
    | (2 = *) (1 = *) (3 = *) |)

("." =))
  *))

;; Stage 4
;; Presentation forms
(generator
 (0
  (cond
   (" ([^ ]+) "
    | (1 :otf=mlm2=pres,abvs,blws,psts,haln,calt+) |)

("." =))
  *))

;; Stage 5
;; Remove ZWNJ/ZWJ
(generator
 (0
  (cond
   ("[NJ]")

("." =))
  *))

;; Stage 6
;; GPOS processing
(generator
 (0
  (cond
   (" ([^ ]+) "
    (1 :otf=mlm2=+kern,dist,abvm,blwm))

("." =))
  *))

;; Copyright (C) 2010
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H15PRO112

;; This file is part of the m17n database; a sub-part of the m17n
;; library.

;; The m17n library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public License
;; as published by the Free Software Foundation; either version 2.1 of
;; the License, or (at your option) any later version.

;; The m17n library is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; Lesser General Public License for more details.

;; You should have received a copy of the GNU Lesser General Public
;; License along with the m17n library; if not, write to the Free
;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;; Local Variables:
;; mode: emacs-lisp
;; End:

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