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;; kn-optitransv2.mim -- Kannada 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 kn optitransv2)

(description "Kannada 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 ಕ, not ಕ್.

1. panchama-varNa-s of vyanjana-varga-s 
  nnk->ಙ್ಕ, nnkh->ಙ್ಖ, nng->ಙ್ಗ, nngh->ಙ್ಘ
  nnch->ಞ್ಚ, nnCh->ಞ್ಛ, nnc->ಞ್ಚ, nnC->ಞ್ಛ,

2. Any common consonant, typed twice, yields that consonant with the virAma. So, nn yields ನ್. The rationale is that a repeated consonant such as ನನ and ದದ is far less common than the consonants with a virAma, such as ನ್ and ದ್.

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 ಶ. But if one wanted to type ಸಹ, one can type: s<Commit key>h or s<left arrow, right arrow>h.

Examples:
- Avoiding unnecessary 'a'-s.
  - kml or kamala - ಕಮಲ 
- Typing vyanjana-s with a virAma
  - sikkt - ಸಿಕ್ತ
  - sik;t - ಸಿಕ್ತ
- Shortcut for typing panchama-s/ anunAsika-s of vargIya-vyanjana-s
  - shankara or shnnkr- ಶಙ್ಕರ।
  - snncit - ಸಞ್ಚಿತ
  - shann karoti - ಶಙ್ ಕರೋತಿ।
- Overriding shortcuts
  - pashyann  karoti - ಪಶ್ಯನ್ ಕರೋತಿ। (Note two spaces here. Avoids ಪಶ್ಯಙ್ ಕರೋತಿ )
  - s<Commit key>h or s<left arrow, right arrow>h or sah or saha - ಸಹ (Avoids ಶ)

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.

Note: You can use many symbols defined in lsymbol.mim.

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

(title "ಕ")

(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" "ಕ")
  ("kh" "ಖ")
  ("K" "ಖ")
  ("g" "ಗ")
  ("gh" "ಘ")
  ("G" "ಘ")
  (".k" "ಕ಼")
  (".kh" "ಖ಼")
  (".K" "ಖ಼")
  (".g" "ಗ಼")
  ("~N" "ಙ")
  ("N^" "ಙ")
  ("ch" "ಚ")
  ("Ch" "ಛ")
  ("c" "ಚ")
  ("C" "ಛ")
  ("chh" "ಛ")
  ("j" "ಜ")
  ("jh" "ಝ")
  ("J" "ಝ")
  ("~n" "ಞ")
  ("JN" "ಞ")
  ("T" "ಟ")
  ("Th" "ಠ")
  ("D" "ಡ")
  ("Dh" "ಢ")
  (".D" "ಡ಼")
  (".Dh" "ಢ಼")
  ("N" "ಣ")
  ("t" "ತ")
  ("th" "ಥ")
  ("d" "ದ")
  ("dh" "ಧ")
  ("n" "ನ")
  ("p" "ಪ")
  ("ph" "ಫ")
  ("P" "ಫ")
  (".ph" "ಫ಼")
  ("f" "ಫ಼")
  ("b" "ಬ")
  ("bh" "ಭ")
  ("B" "ಭ")
  ("m" "ಮ")
  ("y" "ಯ")
  ("r" "ರ")
  ("l" "ಲ")
  ("L" "ಳ")
  ("v" "ವ")
  ("w" "ವ")
  ("sh" "ಶ")
  ("Z" "ज़")
  (".j" "ಜ಼")
  ("z" "ಶ")
  ("S" "ಷ")
  ("Sh" "ಷ")
  ("shh" "ಷ")
  ("s" "ಸ")
  ("h" "ಹ")
  ("ttr" "ತ್ರ")
  ("jjn" "ಜ್ಞ")
  ("j~n" "ಜ್ಞ")
  ("x" "ಕ್ಷ")

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

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

) ; consonant ends

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

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

(consonant_with_viraama
  ; virAma shortcuts
  ("kk" "ಕ್")
  ("khkh" "ಖ್")
  ("KK" "ಖ್")
  ("gg" "ಗ್")
  ("ghgh" "ಘ್")
  ("GG" "ಘ್")
  ("~N~N" "ಙ್")
  ("chch" "ಚ್")
  ("ChCh" "ಛ್")
  ("cc" "ಚ್")
  ("CC" "ಛ್")
  ("jj" "ಜ್")
  ("jhjh" "ಝ್")
  ("JJ" "ಝ್")
  ("~n~n" "ಞ್")
  ("JNJN" "ಞ್")
  ("TT" "ಟ್")
  ("ThTh" "ಠ್")
  ("DD" "ಡ್")
  ("DhDh" "ಢ್")
  ("NN" "ಣ್")
  ("tt" "ತ್")
  ("thth" "ಥ್")
  ("dd" "ದ್")
  ("dhdh" "ಧ್")
  ("nn" "ನ್")
  ("pp" "ಪ್")
  ("phph" "ಫ್")
  ("PP" "ಫ್")
  ("FF" "ಫ़್")
  ("bb" "ಬ್")
  ("bhbh" "ಭ್")
  ("BB" "ಭ್")
  ("mm" "ಮ್")
  ("M" "ಂ")
  ("MM" "ಮ್")
  ("yy" "ಯ್")
  ("rr" "ರ್")
  ("ll" "ಲ್")
  ("LL" "ಳ್")
  ("vv" "ವ್")
  ("shsh" "ಶ್")
  ("zz" "ಶ್")
  ("SS" "ಷ್")
  ("ShSh" "ಷ್")
  ("ss" "ಸ್")
  ("hh" "ಹ್")
  ("xx" "ಕ್ಷ್")
  ) ; consonant_with_viraama ends

(independent
  ("a" "ಅ")
  ("aa" "ಆ")
  ("A" "ಆ")
  ("i" "ಇ")
  ("ii" "ಈ")
  ("I" "ಈ")
  ("u" "ಉ")
  ("uu" "ಊ")
  ("U" "ಊ")
  ("R" "ಋ")
  ("RRi" "ಋ")
  ("R^i" "ಋ")
  ("LLi" "ಌ")
  ("L^i" "ಌ")
  ("e" "ಎ")
  ("ee" "ಏ")
  ("E" "ಏ")
  ("ai" "ಐ")
  ("o" "ಒ")
  ("oo" "ಓ")
  ("O" "ಓ")
  ("au" "ಔ")
  ("RRI" "ೠ")
  ("RR" "ೠ")
  ("R^I" "ೠ")
  ("LLI" "ೡ")
  ("L^I" "ೡ")
  ("AUM" "ಓಂ")
  ("OM" "ಓಂ")
  
  (".a" "ಽ")
  ((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" "ँ") ; TODO: Change to kn glyph.
  ("M" "ಂ")
  ("H" "ಃ")
  ("HH" "ᳲ")  ; ardhavisarga - often used to denote jihvAmUlIya and upadhmAnIya. 
 ) ; ayogavAhas end

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

(digit
  ("0" "೦")
  ("1" "೧")
  ("2" "೨")
  ("3" "೩")
  ("4" "೪")
  ("5" "೫")
  ("6" "೬")
  ("7" "೭")
  ("8" "೮")
  ("9" "೯")
  ((KP_0) "೦")
  ((KP_1) "೧")
  ((KP_2) "೨")
  ((KP_3) "೩")
  ((KP_4) "೪")
  ((KP_5) "೫")
  ((KP_6) "೬")
  ((KP_7) "೭")
  ((KP_8) "೮")
  ((KP_9) "೯")) ; digit ends

(udattta
  ("_" "॒")
  ("''" "॑"))

(dependent
  ("a" "")
  ("aa" "ಾ")
  ("A" "ಾ")
  ("i" "ಿ")
  ("ii" "ೀ")
  ("I" "ೀ")
  ("u" "ು")
  ("uu" "ೂ")
  ("U" "ೂ")
  ("R" "ೃ")
  ("RRi" "ೃ")
  ("R^i" "ೃ")
  ("LLi" "ೢ")
  ("L^i" "ೢ")
  ("e" "ೆ")
  ("E" "ೇ")
  ("ee" "ೇ")
  ("ai" "ೈ")
  ("o" "ೊ")
  ("O" "ೋ")
  ("oo" "ೋ")
  ("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

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