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Filename : ARAB-OTF-NO-GPOS.flt
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;; ARAB-OTF-NO-GPOS.flt -- Font Layout Table for Arabic OpenType font sans GPOS
;; Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010  AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter arab-otf-no-gpos nil
      (font (nil nil unicode-bmp :otf=arab=init,medi,fina+~mark)))

;;; <li> ARAB-OTF-NO-GPOS.flt
;;;
;;; For Arabic OpenType fonts that don't have GPOS table to draw the
;;; Arabic script.

;; Step 0: Move Kazakh high hamza.

(category
 ;; p: high hamza carrier (p for positive)
 ;; n: high hamza suppressor (n for negative)
 ;; x: don't care
 ;; X: presentation form
 (0x0600 0x06FF		?x)
 (0x0674 0x0678		?p)
 (0x0643		?n)
 (0x06AF		?n)
 (0x06D5		?n)
 (0x0750 0x077F		?x)		; Arabic Supplement
 (0x200C		?x)
 (0x200D		?x)
 (0x25CC		?x)
 (0xFB50 0xFDFF		?X)		; Arabic Presentation Forms-A
 (0xFE70 0xFEFC		?X)		; Arabic Presentation Forms-B
 )

(generator
 (0
  (cond
   ;; If a presentation form is found, draw the whole sequence as is.
   (".*X.*" = *)

   (".*p.*"				; If a high hamza is found,
    (cond
     (".*n.*"				;   and a suppressor exists,
      rmhamza *)			;   then remove the high hamza.
     (0					;   Otherwise, move the high
      0x674 rmhamza *)))		;   hamza to the beginning.
   (0 = *)))				; If no high hamza, do nothing.

 (rmhamza
  (cond
   ((0x0674)		)
   ((0x0675)		0x0627)
   ((0x0676)		0x0648)
   ((0x0677)		0x06C7)
   ((0x0678)		0x0649)
   ("."			=))))

;; Step 1: Initial, medial, or final.  Surround diacritics by
;; separators (|).

(category
 ;; D: Dual-joining (beh, teh, etc. & zwj) except for LAMs
 ;; L: LAMs
 ;; R: Right-joining (alef, dal, thal, reh, zain) except for ALEFs
 ;; A: ALEFs
 ;; U: Non-joining (Hamza, etc. & zwnj)
 ;; T: Transparent (combining marks)
 (0x060B 0x060F		?U)
 (0x0610 0x0615		?T)
 (0x061B		?U)
 (0x061E 0x061F		?U)
 (0x0621		?U)
 (0x0622 0x0627		?A)
 (0x0624		?R)
 (0x0626		?D)
 (0x0628		?D)
 (0x0629		?R)
 (0x062A 0x062E		?D)
 (0x062F 0x0632		?R)
 (0x0633 0x0647		?D)
 (0x0644		?L)
 (0x0648		?R)
 (0x0649 0x064A		?D)
 (0x064B 0x065E		?T)
 (0x0660 0x066D		?U)
 (0x066E 0x066F		?D)
 (0x0670		?T)
 (0x0671 0x0673		?A)
 (0x0674 0x0678		?U)
 (0x0679 0x0687		?D)
 (0x0688 0x0699		?R)
 (0x069A 0x06C3		?D)
 (0x06B5 0x06B8		?L)
 (0x06C4 0x06CB		?R)
 (0x06CC 0x06CE		?D)
 (0x06CF		?R)
 (0x06D0 0x06D3		?D)
 (0x06D4		?U)
 (0x06D5		?R)
 (0x06D6 0x06E4		?T)
 (0x06E5 0x06E6		?U)
 (0x06E7 0x06E8		?T)
 (0x06E9		?U)
 (0x06EA 0x06ED		?T)
 (0x06EE 0x06EF		?R)
 (0x06F0 0x06F9		?U)
 (0x06FA 0x06FC		?D)
 (0x06FD 0x06FE		?U)
 (0x06FF		?D)
 (0x0750 0x0758		?D)
 (0x0759 0x075B		?R)
 (0x075C 0x076A		?D)
 (0x076B 0x076C		?R)
 (0x076D 0x0770		?D)
 (0x0771		?R)
 (0x0772		?D)
 (0x0773 0x0774		?R)
 (0x0775 0x0777		?D)
 (0x0778 0x0779		?R)
 (0x077A 0x077F		?D)
 (0x200C		?U)
 (0x200D		?D)
 (0x25CC		?U)
 (0xE800		?C)		; dummy dotted-circle
 (0xFB50 0xFDFF		?X)		; Arabic Presentation Forms-A
 (0xFE70 0xFEFC		?X)		; Arabic Presentation Forms-B
 )

(generator
 (0
  (cond
   (".*X.*" (cond ("[DLRAUX]T*" < = * >) ("." =)) *)

   ;; LAM-ALEF pattern.  Move diacritcs on LAM after ALEF.  This is to
   ;; avoid loosing surrounding separators by OTF's liga or rlig
   ;; features in the next step.
   ("(L)(T*)(A)(T*)(.*)"
    (1 otf:arab=init)
    (3 otf:arab=fina)
    (2 | = * |)
    (4 | = * |)
    (5 disjoin))

   ("[DL].*"
    (cond
     ("(.)(T*)([DLRA].*)"
      (1 otf:arab=init)
      (2 | = * |)
      (3 join))
     ("(.)(T*)(.*)"			; == (D)(T*)(U.*)
      (1 otf:arab=isol)
      (2 | = * |)
      (3 disjoin))))

   ("([RAU])(T*)(.*)"
    (1 otf:arab=isol)
    (2 | = * | )
    (3 disjoin))

   ;; Incorrect leading diacritcs.
   ("(T+)(.*)"
    (1 (cond ((font-facility 0x25CC)
	      (cond ("." 0x25CC | = |)) *)
	     ("." 0xE800 | = |)) *)
    (2 disjoin))))

 (join
  (cond
   ;; LAM-ALEF pattern.  See the above comment.
   ("(L)(T*)(A)(T*)(.*)"
    (1 otf:arab=medi)
    (3 otf:arab=fina)
    (2 | = * |)
    (4 | = * |)
    (5 disjoin))

   ("[DL].*"
    (cond
     ("(.)(T*)([DLRA].*)"
      (1 otf:arab=medi)
      (2 | = * |)
      (3 join))
     ("(.)(T*)(.*)"			; == (D)(T*)(U.*)
      (1 otf:arab=fina)
      (2 | = * |)
      (3 disjoin))))

   ("(.)(T*)(.*)"
    (1 otf:arab=fina)
    (2 | = * |)
    (3 disjoin))))

 (disjoin
  (cond
   ;; LAM-ALEF pattern.  See the above comment.
   ("(L)(T*)(A)(T*)(.*)"
    (1 otf:arab=init)
    (3 otf:arab=fina)
    (2 | = * |)
    (4 | = * |)
    (5 disjoin))

   ("[DL].*"
    (cond
     ("(.)(T*)([DLRA].*)"
      (1 otf:arab=init)
      (2 | = * |)
      (3 join))
     ("(.)(T*)(.*)"			; == (D)(T*)(U.*)
      (1 otf:arab=isol)
      (2 | = * |)
      (3 disjoin))))

   ("(.)(T*)(.*)"			; == ([RU])(T*)(.*)
    (1 otf:arab=isol)
    (2 | = * |)
    (3 disjoin)))))

;; Step 2: Remaining GSUB features (ligature, etc.).

(generator
 (0
  otf:arab=rlig,calt,liga,dlig,cswh,mset+))

;; Step 3: Simulate missing GPOS features.

(generator
 (0
  (cond
   ("C ([^ ]) "				; dummy dotted-circle
    [ (1 =) ])
   ("([^ ]) ([^ ]+)?  ([^ ]+)? "	; LAM-ALEF ligature
    < (1 =) (2 ("." Br.Br =) *) (3 ("." Bl.Bl =) *) >)
   ("([^ ]) ([^ ]+)? "
    < (1 =) (2 ("." Bc.Bc =) *) >)
   ("([^ ])([^ ]) ([^ ]+)?  ([^ ]+)? "	; failed LAM-ALEF ligature
    (1 < =) (3 ("." Br.Br =) *) > (2 < = ) (4 ("." Bl.Bl =) *) >)
   ("[^ ]" =)
   (" "))
  *))

;; Copyright (C) 2005, 2006, 2007, 2008, 2009, 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: