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;; hi-optitransv2.mim -- Hindi input method.
;; Copyright (C) 2015  Vishvas Vasuki  <vishvas.vasuki@gmail.com>

;; 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.

(input-method hi optitransv2)

(description "Hindi input method by the OPTITRANS
transliteration system.

0. A major deviation from other transliteration systems like ITRANS and HK
is that latin consonants are mapped to the correpsonding devanAgarI consonant *followed by the 
vowel a*. For example, k maps to क, not क्.

1. panchama-varNa-s of vyanjana-varga-s 
  nnk->ङ्क, nnkh->ङ्ख, nng->ङ्ग, nngh->ङ्घ
  nnch->ञ्च, nnCh->ञ्छ, nnc->ञ्च, nnC->ञ्छ,

2. Any common consonant, typed twice, yields that consonant with the virAma. So, nn yields न्. The rationale is that a repeated consonant such as नन and दद is far less common than the consonants with a virAma, such as न् and द्.

3. The rare character sequences that conflict with shortcuts for more frequently occuring strings can be typed using the "commit key" - (Ctrl + Shift  + Enter), or with the use of the arrow key. 
For example, sh yields श. But if one wanted to type सह, one can type: s<Commit key>h or s<left arrow, right arrow>h.

Examples:
- Avoiding unnecessary 'a'-s.
  - kml or kamala - कमल 
- Typing vyanjana-s with a virAma
  - sikkt - सिक्त
  - sik;t - सिक्त
- Shortcut for typing panchama-s/ anunAsika-s of vargIya-vyanjana-s
  - shankara or shnnkr- शङ्कर।
  - snncit - सञ्चित
  - shann karoti - शङ् करोति।
- Overriding shortcuts
  - pashyann  karoti - पश्यन् करोति। (Note two spaces here. Avoids पश्यङ् करोति )
  - s<Commit key>h or s<left arrow, right arrow>h or sah or saha - सह (Avoids श)

The motivation behind additions made to the basic ITRANS scheme
is described in https://sites.google.com/site/sanskritcode/optitrans,
along with a tabulated comparison with several other
transliteration schemes.

Also, see: http://en.wikipedia.org/wiki/Devanagari_transliteration.")

(title "क")

(map
 (non_init_keys
  (".") (";") ("~") ("$")
  ("A") ("B") ("C") ("D") ("E") ("F") ("G") ("H") ("I") ("J") ("K") ("L")
  ("M") ("N") ("O") ("P") ("Q") ("R") ("S") ("T") ("U") ("V") ("W") ("X") ("Y") ("Z") 
  ("a") ("b") ("c") ("d") ("e") ("f") ("g") ("h") ("i")
  ("j") ("k") ("l") ("m") ("n") ("o") ("p") ("q") ("r")
  ("s") ("t") ("u") ("v") ("w") ("x") ("y") ("z")
  )

(consonant
  ("k" "क")
  ("kh" "ख")
  ("K" "ख")
  ("g" "ग")
  ("gh" "घ")
  ("G" "घ")
  (".k" "क़")
  ("q" "क़")
  (".kh" "ख़")
  (".K" "ख़")
  (".g" "ग़")
  ("~N" "ङ")
  ("N^" "ङ")
  ("ch" "च")
  ("Ch" "छ")
  ("c" "च")
  ("C" "छ")
  ("chh" "छ")
  ("j" "ज")
  ("jh" "झ")
  ("J" "झ")
  ("~n" "ञ")
  ("T" "ट")
  ("Th" "ठ")
  ("D" "ड")
  ("Dh" "ढ")
  (".D" "ड़")
  (".Dh" "ढ़")
  ("N" "ण")
  ("t" "त")
  ("th" "थ")
  ("d" "द")
  ("dh" "ध")
  ("n" "न")
  (":n" "ऩ")
  ("p" "प")
  ("ph" "फ")
  ("P" "फ")
  (".ph" "फ़")
  ("f" "फ़")
  ("b" "ब")
  ("bh" "भ")
  ("B" "भ")
  ("m" "म")
  ("y" "य")
  ("Y" "य़")
  ("yh" "य़")
  (".y" "य़")
  ("r" "र")
  ("l" "ल")
  ("L" "ळ")
  ("v" "व")
  ("w" "व")
  ("sh" "श")
  ("Z" "ज़")
  (".j" "ज़")
  ("z" "श")
  ("S" "ष")
  ("Sh" "ष")
  ("shh" "ष")
  ("s" "स")
  ("h" "ह")
  ("jjn" "ज्ञ")
  ("JN" "ज्ञ")
  ("x" "क्ष")
  
  ; Best keys for the below are not clear.
  ; ("gH"  ॻ)
  ; ("jH"  ॼ)
  ; ("DH"  "ॾ")
  ; ("BH"  "ॿ")

; nn shortcuts
  ("nnk" "ङ्" (pushback 1))
  ("nnx" "ङ्" (pushback 1))
  ("nnkh" "ङ्" (pushback 1))
  ("nnK" "ङ्" (pushback 1))
  ("nng" "ङ्" (pushback 1))
  ("nngh" "ङ्" (pushback 1))
  ("nnG" "ङ्" (pushback 1))
  ("nnch" "ञ्" (pushback 1))
  ("nnCh" "ञ्" (pushback 1))
  ("nnc" "ञ्" (pushback 1))
  ("nnC" "ञ्" (pushback 1))
  ("nnj" "ञ्" (pushback 1))
  ("nnjh" "ञ्" (pushback 1))
  ("nnJ" "ञ्" (pushback 1))

("nnT" "ण्" (pushback 1))
  ("nnTh" "ण्" (pushback 1))
  ("nnD" "ण्" (pushback 1))
  ("nnDh" "ण्" (pushback 1))

) ; consonant ends

(consonant_with_space
  ; nn shortcuts with space
  ("nn " "न् ")
  ("nn  " "न् ") ; handle the case where the transformation to ङ् etc.. is not desired, even when followed by a character like k.
  ("nn k" "ङ् " (pushback 1))
  ("nn x" "ङ् " (pushback 1))
  ("nn K" "ङ् " (pushback 1))
  ("nn g" "ङ् " (pushback 1))
  ("nn G" "ङ् " (pushback 1))
  ("nn c" "ञ् " (pushback 1))
  ("nn C" "ञ् " (pushback 1))
  ("nn j" "ञ् " (pushback 1))
  ("nn J" "ञ् " (pushback 1))

("nn T" "ण् " (pushback 1))
  ("nn D" "ण् " (pushback 1))
  ) ; consonant_with_space ends

(consonant_with_viraama
  ; virAma shortcuts
  ("kk" "क्")
  ("khkh" "ख्")
  ("KK" "ख्")
  ("gg" "ग्")
  ("ghgh" "घ्")
  ("GG" "घ्")
  ("~N~N" "ङ्")
  ("chch" "च्")
  ("ChCh" "छ्")
  ("cc" "च्")
  ("CC" "छ्")
  ("jj" "ज्")
  ("jhjh" "झ्")
  ("JJ" "झ्")
  ("~n~n" "ञ्")
  ("JNJN" "ञ्")
  ("TT" "ट्")
  ("ThTh" "ठ्")
  ("DD" "ड्")
  ("DhDh" "ढ्")
  ("NN" "ण्")
  ("tt" "त्")
  ("thth" "थ्")
  ("dd" "द्")
  ("dhdh" "ध्")
  ("nn" "न्")
  ("pp" "प्")
  ("phph" "फ्")
  ("PP" "फ्")
  ("FF" "फ़्")
  ("bb" "ब्")
  ("bhbh" "भ्")
  ("BB" "भ्")
  ("mm" "म्")
  ("M" "ं")
  ("MM" "म्")
  ("yy" "य्")
  ("rr" "र्")
  ("ll" "ल्")
  ("LL" "ळ्")
  ("vv" "व्")
  ("shsh" "श्")
  ("ZZ" "ज़्")
  (".j.j" "ज़्")
  ("zz" "श्")
  ("SS" "ष्")
  ("ShSh" "ष्")
  ("ss" "स्")
  ("hh" "ह्")
  ("xx" "क्ष्")
  ("jjnjjn" "ज्ञ्")
  ("JNJN" "ज्ञ्")
  ) ; consonant_with_viraama ends

(independent
  ("a" "अ")
  ("aa" "आ")
  ("A" "आ")
  ("i" "इ")
  ("ii" "ई")
  ("I" "ई")
  ("u" "उ")
  ("uu" "ऊ")
  ("U" "ऊ")
  ("R" "ऋ")
  ("RRi" "ऋ")
  ("R^i" "ऋ")
  ("LLi" "ऌ")
  ("L^i" "ऌ")
  ("ea" "ऍ")
  ("ee" "ऎ")
  ("E" "ऎ")
  ("e" "ए")
  ("ai" "ऐ")
  ("oo" "ऒ")
  ("O" "ऒ")
  ("o" "ओ")
  ("oa" "ऑ")
  ("au" "औ")
  ("RRI" "ॠ")
  ("RR" "ॠ")
  ("R^I" "ॠ")
  ("LLI" "ॡ")
  ("L^I" "ॡ")
  ("AUM" "ॐ")
  ("OM" "ॐ")
  
  (".a" "ऽ")
  ((S-\ ) "‌")
  ((C-@) "‍")) ; independent ends

(ayogavAhas
  ; Visarga and the like may appear after a vowel. So, they aren't expected just in the dependent state.
  (".N" "ँ")
  ("M" "ं")
  ("H" "ः")
  ("HH" "ᳲ")  ; ardhavisarga - often used to denote jihvAmUlIya and upadhmAnIya. 
 ) ; ayogavAhas end

(ayogavAhas_with_consonant
   ; jihvAmUlIya and upadhmAnIya shortcuts
  ("Hk" "ᳵ" (pushback 1)) 
  ("Hp" "ᳶ" (pushback 1))
  ("Hkh" "ᳵ" (pushback 1)) 
  ("Hph" "ᳶ" (pushback 1))
  ("HK" "ᳵ" (pushback 1)) 
  ("HP" "ᳶ" (pushback 1))
  ) ; ayogavAhas_with_consonant ends

(digit
  ("0" "०")
  ("1" "१")
  ("2" "२")
  ("3" "३")
  ("4" "४")
  ("5" "५")
  ("6" "६")
  ("7" "७")
  ("8" "८")
  ("9" "९")
  ((KP_0) "०")
  ((KP_1) "१")
  ((KP_2) "२")
  ((KP_3) "३")
  ((KP_4) "४")
  ((KP_5) "५")
  ((KP_6) "६")
  ((KP_7) "७")
  ((KP_8) "८")
  ((KP_9) "९")) ; digit ends

(udattta
  ("_" "॒")
  ("''" "॑"))

(dependent
  ("a" "")
  ("aa" "ा")
  ("A" "ा")
  ("i" "ि")
  ("ii" "ी")
  ("I" "ी")
  ("u" "ु")
  ("uu" "ू")
  ("U" "ू")
  ("R" "ृ")
  ("RRi" "ृ")
  ("R^i" "ृ")
  ("LLi" "ॢ")
  ("L^i" "ॢ")
  ("ea" "ॅ")
  ("ee" "ॆ")
  ("E" "ॆ")
  ("e" "े")
  ("ai" "ै")
  ("oo" "ॊ")
  ("O" "ॊ")
  ("o" "ो")
  ("oa" "ॉ")
  ("au" "ौ")
  ("RR" "ॄ")
  ("RRI" "ॄ")
  ("R^I" "ॄ")
  ("LLI" "ॣ")
  ("L^I" "ॣ")
  (";" "्")
  (".h" "्")
  ) ; dependent end

(dot_start
  ("." "।")
  (".." "।")
  (".," "॥")
  ("./" "॰")
  (". " "।" (pushback 1))
  ((?. Return) "।" (pushback 1))
  ((?. Tab) "।" (pushback 1))
  (".(" "।" (pushback 1))
  (".)" "।" (pushback 1))
  (".[" "।" (pushback 1))
  (".]" "।" (pushback 1))
  (".{" "।" (pushback 1))
  (".}" "।" (pushback 1))
  (".'" "।" (pushback 1))
  (".\"" "।" (pushback 1))) ; dot_start ends

(commit-key
  ((S-C-Return)))

(backspace
  ((BackSpace) (undo)))
  ) ; map ends

(state
 (state_init
  (non_init_keys (pushback 1) (shift state_indic_letter))
  (udattta)
  (digit)
  (commit-key)
  )

(state_indic_letter
  (consonant (shift state_consonant_pressed))
  (ayogavAhas_with_consonant (shift state_consonant_pressed))
  (consonant_with_space (shift state_init))
  (consonant_with_viraama (shift state_init))
  (independent (shift state_init))
  (dot_start (shift state_init))
  (backspace)
  (ayogavAhas (shift state_init))
  )

(state_consonant_pressed
  (consonant)
  (ayogavAhas_with_consonant)
  (consonant_with_space (shift state_init))
  (consonant_with_viraama (shift state_init))
  (dependent (shift state_init))
  (dot_start (shift state_init))
  (backspace)
  (ayogavAhas (shift state_init))
  )
) ; state ends

;; Local Variables:
;; coding: utf-8
;; mode: emacs-lisp
;; End: