;; hi-brahmi-itrans.mim -- Hindi brAhmi input method by ITRANS and Harvard-Kyoto transliteration systems.
;; Copyright (C) 2023  Vishvas Vasuki  <[email protected]>

;; 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 General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>

(input-method hi brahmi-itrans)

(description "Hindi brAhmi input method by ITRANS and Harvard-Kyoto
transliteration systems.
You can use all the standard ITRANS key sequences plus key
sequences such as the below.

nk->𑀗𑁆𑀓𑁆, nkh->𑀗𑁆𑀔𑁆, ng->𑀗𑁆𑀕𑁆, ngh->𑀗𑁆𑀖𑁆
nch->𑀜𑁆𑀘𑁆, nCh->𑀜𑁆𑀙𑁆, nc->𑀜𑁆𑀘𑁆, nC->𑀜𑁆𑀙𑁆, nchh->𑀜𑁆𑀙𑁆,
nj->𑀜𑁆𑀚𑁆, njh->𑀜𑁆𑀛𑁆, nT->𑀡𑁆𑀝𑁆, nTh->𑀡𑁆𑀞𑁆, nD->𑀡𑁆𑀟𑁆, nDh->𑀡𑁆𑀠𑁆
c->𑀘𑁆, C->𑀙𑁆, z->𑀰𑁆, S->𑀱𑁆, jn->𑀚𑁆𑀜𑁆, R->𑀋

In addition, for convenience, when a consonant + halant sequence
is followed by non Devanagari letter, the last halant is removed.
For instance, 'k SPC'->'𑀓 ', 'k..'->'𑀓𑁇'.

The motivation behind additions made to the basic ITRANS scheme
is described in https://sanskrit-coders.github.io/input/optitrans/,
along with a tabulated comparison with several other
transliteration schemes.

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

(title "𑀓")

(variable
(trim-last-halant
(_"If this variable is 1 (the default), the last Halant in a syllable
is removed if it is followed by non Brahmi letter. For instance,
typing \"har..\" produces \"𑀳𑀭𑁇\", not \"𑀳𑀭𑁆𑁇\".")
1 0 1))

(map
(starter
(".") ("~") ("#") ("$") ("*") ("]") ((C-@))
("0") ("1") ("2") ("3") ("4") ("5") ("6") ("7") ("8") ("9")
("A") ("C") ("D") ("E") ("G") ("H") ("I") ("J") ("K") ("L")
("M") ("N") ("O") ("R") ("S") ("T") ("U") ("Y")
("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")
((KP_1)) ((KP_2)) ((KP_3)) ((KP_4)) ((KP_5))
((KP_6)) ((KP_7)) ((KP_8)) ((KP_9)) ((KP_0)))

(consonant
("k" "𑀓𑁆")
("kh" "𑀔𑁆")
("K" "𑀔𑁆")
("g" "𑀕𑁆")
("gh" "𑀖𑁆")
("G" "𑀖𑁆")
(".k" "𑀓𑁆 ")
("q" "𑀓𑁆")
(".kh" "𑀔𑁆")
(".K" "𑀔𑁆")
(".g" "𑀕𑁆")
("nk" "𑀗𑁆𑀓𑁆")
("nx" "𑀗𑁆𑀓𑁆𑀱𑁆")
("nkh" "𑀗𑁆𑀔𑁆")
("nK" "𑀗𑁆𑀔𑁆")
("ng" "𑀗𑁆𑀕𑁆")
("ngh" "𑀗𑁆𑀖𑁆")
("nG" "𑀗𑁆𑀖𑁆")
("~N" "𑀗𑁆")
("N^" "𑀗𑁆")
("ch" "𑀘𑁆")
("Ch" "𑀙𑁆")	; not in ITRANS Devanagari table
("c" "𑀘𑁆")
("C" "𑀙𑁆")	; not in ITRANS Devanagari table
("chh" "𑀙𑁆")
("j" "𑀚𑁆")
("jh" "𑀛𑁆")
("J" "𑀛𑁆")
("nch" "𑀜𑁆𑀘𑁆")
("nCh" "𑀜𑁆𑀙𑁆")	; not in ITRANS Devanagari table
("nc" "𑀜𑁆𑀘𑁆")
("nC" "𑀜𑁆𑀙𑁆")	; not in ITRANS Devanagari table
("nchh" "𑀜𑁆𑀙𑁆")
("nj" "𑀜𑁆𑀚𑁆")
("njh" "𑀜𑁆𑀛𑁆")
("nJ" "𑀜𑁆𑀛𑁆")
("~n" "𑀜𑁆")
("JN" "𑀜𑁆")
("T" "𑀝𑁆")
("Th" "𑀞𑁆")
("D" "𑀟𑁆")
("Dh" "𑀠𑁆")
(".D" "𑀟𑁆")
(".Dh" "𑀠𑁆")
("nT" "𑀡𑁆𑀝𑁆")
("nTh" "𑀡𑁆𑀞𑁆")
("nD" "𑀡𑁆𑀟𑁆")
("nDh" "𑀡𑁆𑀠𑁆")
("N" "𑀡𑁆")
("t" "𑀢𑁆")
("th" "𑀣𑁆")
("d" "𑀤𑁆")
("dh" "𑀥𑁆")
("n" "𑀦𑁆")
(":n" "𑀦𑁆")	; not in ITRANS Devanagari table
("p" "𑀧𑁆")
("ph" "𑀨𑁆")
("P" "𑀨𑁆")
(".ph" "𑀨𑁆")
("f" "𑀨𑁆")
("b" "𑀩𑁆")
("bh" "𑀪𑁆")
("B" "𑀪𑁆")
("m" "𑀫𑁆")
("y" "𑀬𑁆")
("Y" "𑀬𑁆") ; not in ITRANS Brahmi table
("yh" "𑀬𑁆") ; not in ITRANS Brahmi table
(".y" "𑀬𑁆")
("r" "𑀭𑁆")
("l" "𑀮𑁆")
("L" "𑀴𑁆")
("ld" "𑀴𑁆")
("v" "𑀯𑁆")
("w" "𑀯𑁆")
("sh" "𑀰𑁆")
("z" "𑀚𑁆")
(".j" "𑀚𑁆")
; ("z" "𑀰𑁆")
("S" "𑀱𑁆")
("Sh" "𑀱𑁆")
("shh" "𑀱𑁆")
("s" "𑀲𑁆")
("h" "𑀳𑁆")
("jn" "𑀚𑁆𑀜𑁆")
("j~n" "𑀚𑁆𑀜𑁆")
("jn" "𑀚𑁆𑀜𑁆")
("GY" "𑀚𑁆𑀜𑁆")
("dny" "𑀚𑁆𑀜𑁆")	; not in ITRANS Brahmi table
("x" "𑀓𑁆𑀱𑁆")
("ks" "𑀓𑁆𑀲𑁆")
("ksh" "𑀓𑁆𑀱𑁆")
("gH" 𑀕𑁆)
("jH" 𑀚𑁆)
("DH" "𑀟𑁆")
("bH" "𑀩𑁆"))

(independent
("a" "𑀅")
("aa" "𑀆")
("A" "𑀆")
("i" "𑀇")
("ii" "𑀈")
("I" "𑀈")
("u" "𑀉")
("uu" "𑀊")
("U" "𑀊")
("R" "𑀋")
("RRi" "𑀋")
("R^i" "𑀋")
("LLi" "𑀍")	; not in ITRANS Brahmi table
("L^i" "𑀍")	; not in ITRANS Brahmi table
(".c" "𑀏") ; not in ITRANS Brahmi table
("ea" "𑀏") ; not in ITRANS Brahmi table
("ee" (set CANDRA-E-O 0) "𑀏")	; not in ITRANS Brahmi table
("E" "𑀏")	; not in ITRANS Brahmi table
("e" (set CANDRA-E-O ?𑀏) "𑀏")
("ai" "𑀐")
("oo" (set CANDRA-E-O 0) "𑀑") ; not in ITRANS Brahmi table
("O" "𑀑")	; not in ITRANS Brahmi table
("o" (set CANDRA-E-O ?𑀆) "𑀑")
("oa" "𑀆")
("au" "𑀒")
("RRI" "𑀌")	; not in ITRANS Brahmi table
("RR" "𑀌")	; not in ITRANS Brahmi table
("R^I" "𑀌")	; not in ITRANS Brahmi table
("LLI" "𑀎")	; not in ITRANS Brahmi table
("L^I" "𑀎")	; not in ITRANS Brahmi table
(".N" "𑀀")
(".n" "𑀁")
("M" "𑀁")
("H" "𑀂")
("kH" "ᳵ")
("pH" "ᳶ")
(".a" "")
(".h" "𑁆")
("AUM" "𑀑𑀁")
("OM" "𑀑𑀁"))

(digit
("0" "𑁦")
("1" "𑁧")
("2" "𑁨")
("3" "𑁩")
("4" "𑁪")
("5" "𑁫")
("6" "𑁬")
("7" "𑁭")
("8" "𑁮")
("9" "𑁯")
((KP_0) "𑁦")
((KP_1) "𑁧")
((KP_2) "𑁨")
((KP_3) "𑁩")
((KP_4) "𑁪")
((KP_5) "𑁫")
((KP_6) "𑁬")
((KP_7) "𑁭")
((KP_8) "𑁮")
((KP_9) "𑁯"))

(dependent
("a" (delete @-) "")
("aa" (delete @-) "𑀸")
("A" (delete @-) "𑀸")
("i" (delete @-) "𑀺")
("ii" (delete @-) "𑀻")
("I" (delete @-) "𑀻")
("u" (delete @-) "𑀼")
("uu" (delete @-) "𑀽")
("U" (delete @-) "𑀽")
("R" (delete @-) "𑀾")
("RRi" (delete @-) "𑀾")
("R^i" (delete @-) "𑀾")
("LLi" (delete @-) "𑁀")	; not in ITRANS Brahmi table
("L^i" (delete @-) "𑁀")	; not in ITRANS Brahmi table
(".c" (delete @-) "𑁂") ; not in ITRANS Brahmi table
("ea" (delete @-) "𑁂") ; not in ITRANS Brahmi table
("ee" (delete @-) (set CANDRA-E-O 0) "𑁂") ; not in ITRANS Brahmi table
("E" (delete @-) "𑁂")	; not in ITRANS Brahmi table
("e" (delete @-) (set CANDRA-E-O ?𑁂) "𑁂")
("ai" (delete @-) "𑁃")
("oo" (delete @-) (set CANDRA-E-O 0) "𑁄") ; not in ITRANS Brahmi table
("O" (delete @-) "𑁄")	; not in ITRANS Brahmi table
("o" (delete @-) (set CANDRA-E-O ?𑀸) "𑁄")
("oa" "𑀸")
("au" (delete @-) "𑁅")
("RR" (delete @-) "𑀿")	; not in ITRANS Brahmi table
("RRI" (delete @-) "𑀿")	; not in ITRANS Brahmi table
("R^I" (delete @-) "𑀿")	; not in ITRANS Brahmi table
("LLI" (delete @-) "𑁁")	; not in ITRANS Brahmi table
("L^I" (delete @-) "𑁁"))	; not in ITRANS Brahmi table

(dot
("." (set DOT 1) "."))

(eo-dot-c
(".c" (delete @-) (insert CANDRA-E-O)))

(danda
(".." "𑁇")	; not in ITRANS Brahmi table
(".," "𑁈")	; not in ITRANS Brahmi table
(". " "𑁇" (pushback 1))
((?. Return) "𑁇" (pushback 1))
((?. Tab) "𑁇" (pushback 1))
(".(" "𑁇" (pushback 1))
(".)" "𑁇" (pushback 1))
(".[" "𑁇" (pushback 1))
(".]" "𑁇" (pushback 1))
(".{" "𑁇" (pushback 1))
(".}" "𑁇" (pushback 1))
(".'" "𑁇" (pushback 1))
(".\"" "𑁇" (pushback 1)))

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

(backspace
((BackSpace) (undo))))

(state
(init
(starter (pushback 1) (shift intermediate)))

(intermediate
;; CANDRA-E-O is set to the character CANDRA E or CANDRA O when "e"
;; or "o" is typed, and in that case, if ".c" is typed, the
;; character set to CANDRA-E-O is inserted.
(t (set CANDRA-E-O 0))
;; LAST-HALANT-POS is set to the position after a consonat + HALANT
;; sequence. If the following key is for non-letter, that HALANT
;; character is removed.
(consonant (mark LAST-HALANT-POS) (shift second))
(independent (cond (CANDRA-E-O (shift after-eo)) (1 (shift init))))
(digit (shift init))
(danda (shift init))
(backspace)
(commit-key (shift init)))

(second
;; CANDRA-E-O is set to the character CANDRA E or CANDRA O when "e"
;; or "o" is typed, and in that case, if ".c" is typed, the
;; character set to CANDRA-E-O is inserted.
(t (set CANDRA-E-O 0))
(consonant (mark LAST-HALANT-POS))
(dependent (cond (CANDRA-E-O (shift after-eo)) (1 (shift init))))
(danda
(cond (trim-last-halant (move LAST-HALANT-POS) (delete @-) (move @>)))
(shift init))
(backspace)
(commit-key (shift init))
(nil (cond (trim-last-halant (move LAST-HALANT-POS) (delete @-) (move @>)))
(shift init)))

(after-eo
(t (set DOT 0))
(dot)
(eo-dot-c (shift init))
(danda (shift init))
(commit-key (shift init))
(nil (cond (DOT (delete @-) (pushback 1))) (shift init))))

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