;;; tibetan.el --- Quail package for inputting Tibetan characters -*-coding: utf-8-emacs; lexical-binding: t; -*-

;; Copyright (C) 1997, 2001-2022 Free Software Foundation, Inc.
;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
;;   2006, 2007, 2008, 2009, 2010, 2011
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H14PRO021

;; Keywords: multilingual, input method, Tibetan

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;; Author: Toru TOMABECHI <Toru.Tomabechi@orient.unil.ch>

;; Created: Feb. 17. 1997

;; History:
;; 1997.03.13 Support for inputting special signs and punctuation added.
;;            (Only Ext. Wylie input)

;;; Commentary:

;;; Code:

(require 'quail)
(require 'tibet-util)

;; Now quail-current-key is set to Tibetan-Roman transcription.  We
;; set quail-current-str to the corresponding Tibetan string (composed
;; if necessary).  Both Wylie and TibKey input methods use this
;; function.

(defun quail-tibetan-update-translation (control-flag)
  (if (numberp control-flag)
      ;; Non-composable-character typed.
      (setq quail-current-str
	    (buffer-substring (overlay-start quail-overlay)
			      (overlay-end quail-overlay))
	    unread-command-events
	    (append
	     (substring quail-current-key control-flag)
             unread-command-events))
    ;; Special treatment of "-d..." and "-y...".
    (if (string-match "^-[dy]" quail-current-key)
	(setq quail-current-key (substring quail-current-key 1)))
    (let ((str (tibetan-transcription-to-tibetan quail-current-key)))
      ;; If quail-current-key is for punctuation, it can't be
      ;; transcribed by tibetan-transcription-to-tibetan, thus STR
      ;; contains ASCII string now.  In that case, use the current
      ;; characters set in quail-current-str.
      (if (> (aref str 0) 255)
	  (setq quail-current-str (tibetan-compose-string str))
	(or quail-current-str
	    (setq quail-current-str quail-current-key)))))
  control-flag)

;;; Wylie transcription based input methods.

;; Special alist for `འ'.  It must be treated as a subjoined
;; consonant if it follows a consonant.
;; * Removed by Tomabechi 2000/06/10 *
;; 'a chung must be explicitly typed as a vowel ("fa")
;; འ is now treated as normal base consonants
;; (defconst tibetan-wylie-quote-alist '(("'" . ?འ)))

;; Special alist to avoid default stacking.
(defconst tibetan-wylie-non-stacking-alist
  '(("-d" . "ད")
    ("-y" . "ཡ")))

;; Punctuation characters are not transcribed.

(defconst tibetan-wylie-punctuation-alist
   '(("."  . " ")
     (":"  . "ཿ")
     (" "  . "་")
     ("/"  . "།")
     ("//" . "༎")
     ("////" . ["༎ ༎"])
     ("$"  . "༏")
     ("/\"" . "༐")			; Not defined in Ext. Wylie.
     ("&"  . "༐")
     (";"  . "༑")
     ("%"  . "༔")
     ("!"  . "༈")
     ("<"  . "༼")
     (">"  . "༽")
     ("@"  . "྅")
     ("*"  . ["༄༅"])
     ("#"  . ["༄༅༅"])
     ("^"  . "༆")
     ("0" . "༠")
     ("1" . "༡")
     ("2" . "༢")
     ("3" . "༣")
     ("4" . "༤")
     ("5" . "༥")
     ("6" . "༦")
     ("7" . "༧")
     ("8" . "༨")
     ("9" . "༩")
     ("-0" . "༳")
     ("-1" . "༪")
     ("-2" . "༫")
     ("-3" . "༬")
     ("-4" . "༭")
     ("-5" . "༮")
     ("-6" . "༯")
     ("-7" . "༰")
     ("-8" . "༱")
     ("-9" . "༲")
     ("|"  . "ༀ༁༂༃༇༉༊༒༓༕༖༗༘༙༚༛༜༝༞༟༴༶༸༺༻༾༿྾྿࿀࿁࿂࿃࿄࿅࿆࿇࿈࿉࿊࿋࿌࿏")))

(quail-define-package "tibetan-wylie" "Tibetan" "TIBw" t
"Tibetan character input by Extended Wylie key assignment.

    +-------------------------------------+
    |ཀ་ k |ཁ་ kh |ག་ g  |གྷ་ gh |ང་ ng|   ི i          །        /
    |ཅ་ c |ཆ་ ch |ཇ་ j  |       |ཉ་ ny|   ུ u          ༎       //
    |ཊ་ T |ཋ་ TH |ཌ་ D  |ཌྷ་ DH |ཎ་ N |   ེ e          ༎ ༎    ////
    |ཏ་ t |ཐ་ th |ད་ d  |དྷ་ dh |ན་ n |   ོ o          ༑       ;
    |པ་ p |ཕ་ ph |བ་ b  |བྷ་ bh |མ་ m |   ཻ ai (ee, E) ༏        $
    |ཙ་ ts|ཚ་ tsh|ཛ་ dz |ཛྷ་ dzh|ཝ་ w |   ཽ au (oo, O) ༐        &
    |ཞ་ zh|ཟ་ z  |འ་ \\='  |       |ཡ་ y |   ྀ I          ༄༅   *
    |ར་ r |ལ་ l  |ཤ་ sh |ཥ་ SH |ས་ s |   ཿ :         ༄༅༅  #
    |ཧ་ h |ཨ་ A  |ཀྵ་ kSH|       |      |   ཾ M           ༼ ༽   < >
    +-------------------------------------+   ༔  %
    (The consonant ཨ་ must be typed explicitly.)

  NOT SPECIFIED IN EXT. WYLIE:
    +--------------------------------------------------------+
    |ྂ = ~ |ྃ = \\=` |྄ = , |྅ = @ |༷ = _o|༵ = _O|༆ = ^|
    +--------------------------------------------------------+
    |ྈ = x |ྉ = X |྆ = v |྇ = V |ྊ = q |ྋ = Q |
    +-----------------------------------------------+

  SPECIAL KEYS
  +     :  Consonant Stacking
          (Consonant stacking for ordinary Tibetan is done automatically)
  -     : No Consonant Stacking
          (To suppress automatic stacking for \"g-y\",
            and to get da-drag in  -r-d, -l-d .)
  |     : Special signs.

  Tsheg is assigned to SPC.  Space is assigned to period `.'.
"
 nil nil nil nil nil nil nil nil
 #'quail-tibetan-update-translation)

;; Here we build up a Quail map for a Tibetan sequence the whole of
;; which can be one composition.
;;
;; A Tibetan syllable is typically structured as follows:
;;      [P] C [c+] V [M] [S [s]]
;;          ^^^^^^^^^^^^
;; where P:prefix, C:base consonant, c:subjoined consonant,
;; V:vowel, M:vowel modifier, S:suffix, s:post suffix.
;; In this pattern, the part indicated by "^^^" can be one composition.

;;; modified by Tomabechi 1999/12/10
;;; modified by Tomabechi 2000/06/08
;;;             Allows infinite addition of vowels/modifiers
;;;             as specified in Unicode v.3
(quail-install-map
 (quail-map-from-table
  '((base-state (tibetan-consonant-transcription-alist . svm-state)
		(tibetan-precomposed-transcription-alist . svm-state)
		(tibetan-wylie-non-stacking-alist . svm-state)
		tibetan-subjoined-transcription-alist
		tibetan-vowel-transcription-alist
		tibetan-modifier-transcription-alist
		tibetan-wylie-punctuation-alist)
    (svm-state ;;(tibetan-wylie-quote-alist . vm-state)
		(tibetan-vowel-transcription-alist . vm-state)
		(tibetan-subjoined-transcription-alist . svm-state)
		(tibetan-modifier-transcription-alist . m-state))
    (vm-state (tibetan-vowel-transcription-alist . vm-state)
	      (tibetan-modifier-transcription-alist . m-state))
    (m-state (tibetan-modifier-transcription-alist . m-state)))))

;;;
;;; TibKey key alignment based input method
;;;

(defconst tibetan-tibkey-to-transcription-alist
  '(;; consonant
    ("`" . "`")				; sna ldan
    ("~" . "~")				; sna ldan + nada
    ("q" . "k")				; ka
    ("Q" ."kSH")			; kSHa
    ("w" . "kh")			; kha
    ("e" . "g")				; ga
    ("r" . "ng")			; nga
    ("t" . "c")				; ca
    ("T" . "I")				; gi gu log
    ("y" . "ch")			; cha
    ("u" . "j")				; ja
    ("i" . "ny")			; nya
    ("o" . "t")				; ta
    ("O" . "T")				; Ta
    ("p" . "th")			; tha
    ("P" . "TH")			; THa
    ("[" . "d")				; da
    ("{" . "D")				; Da
    ("]" . "n")				; na
    ("}" . "N")				; Na
    ("a" . "p")				; pa
    ("A" . "a")				; Vowel a (not used in original TibKey)
    ("s" . "ph")			; pha
    ("d" . "b")				; ba
    ("f" . "m")				; ma
    ("F" . "M")				; anusvara
    ("g" . "u")				; zhabs kyu
    ("G" . "i")				; gi gu
    ("H" . ",")				; virama
    ("j" . "o")				; naro
    ("J" . "e")				; 'greng bu
    ("k" . "ts")			; tsa
    ("l" . "tsh")			; tsha
    (";" . "dz")                        ; dza
    ("'" . "w")				; wa
    ("\"" . "+w")			; wa zur
    ("z" . "zh")			; zha
    ("x" . "z")				; za
    ("c" . "'")				; 'a
    ("C" . "+'")			; 'a chung
    ("v" . "y")				; ya
    ("V" . "+y")			; ya btags
    ("b" . "r")				; ra
    ("B" . "+r")			; ra btags
    ("n" . "l")				; la
    ("N" . "+l")			; la btags
    ("m" . "sh")			; sha
    ("M" . "SH")			; SHa
    ("," . "s")				; sa
    ("." . "h")				; ha
    ("/" . "A")				; Aa
    ;; subjoined
    ("hq" . "+k")			; ka
    ("hQ" ."+kSH")			; kSHa
    ("hw" . "+kh")			; kha
    ("he" . "+g")			; ga
    ("hr" . "+ng")			; nga
    ("ht" . "+c")			; ca
    ("hy" . "+ch")			; cha
    ("hu" . "+j")			; ja
    ("hi" . "+ny")			; nya
    ("ho" . "+t")			; ta
    ("hO" . "+T")			; Ta
    ("hp" . "+th")			; tha
    ("hP" . "+TH")			; THa
    ("h[" . "+d")			; da
    ("h{" . "+D")			; Da
    ("h]" . "+n")			; na
    ("h}" . "+N")			; Na
    ("ha" . "+p")			; pa
    ("hs" . "+ph")			; pha
    ("hd" . "+b")			; ba
    ("hf" . "+m")			; ma
    ("hk" . "+ts")			; tsa
    ("hl" . "+tsh")			; tsha
    ("h;" . "+dz")                      ; dza
    ("h'" . "+w")			; wa
    ("hz" . "+zh")			; zha
    ("hx" . "+z")			; za
    ("hc" . "+'")			; 'a
    ("hv" . "+y")			; ya
    ("hb" . "+r")			; ra
    ("hn" . "+l")			; la
    ("hm" . "+sh")			; sha
    ("hM" . "+SH")			; SHa
    ("h," . "+s")			; sa
    ("h." . "+h")			; ha
    ("h/" . "+A")			; Aa
    ;; Special rule for `ཡ' to avoid stacking.
    ("E" . "-y")
    ))

(defconst tibetan-consonant-tibkey-alist nil)
(defconst tibetan-subjoined-tibkey-alist nil)
(defconst tibetan-vowel-tibkey-alist nil)
(defconst tibetan-modifier-tibkey-alist nil)
(defconst tibetan-non-stacking-tibkey-alist nil)

(let ((type-list '("consonant" "subjoined" "vowel" "modifier" "non-stacking"))
      (tail tibetan-tibkey-to-transcription-alist)
      elt)
  (while tail
    (setq elt (car tail) tail (cdr tail))
    (let ((types type-list)
	  type transcription trans-alist tibkey-alist)
      (while types
	(setq type (car types) types (cdr types))
	(setq trans-alist
	      (if (string= type "non-stacking")
		  'tibetan-wylie-non-stacking-alist
		(intern (format "tibetan-%s-transcription-alist" type)))
	      transcription
	      (cdr (assoc (cdr elt) (symbol-value trans-alist))))
	(when transcription
	  (setq tibkey-alist (intern (format "tibetan-%s-tibkey-alist" type)))
	  (set tibkey-alist
	       (cons (cons (car elt) transcription)
		     (symbol-value tibkey-alist)))))
      (or tibkey-alist
	  (error "No Tibetan transcription for %s" (cdr elt))))))

(defconst tibetan-punctuation-tibkey-alist
  '(("1" . "༡")
    ("!" . "༄")		; nyi zla long
    ("2" . "༢")
    ("@" . "༅")			; nyi zla simple
    ("3" . "༣")
;;; ("#" )
    ("4" . "༤")
;;; ("$" )
    ("5" . "༥")
    ("%" . "༔")
    ("6" . "༦")
    ("^" . "༁")
    ("7" . "༧")
    ("8" . "༨")
;;; ("*" ) ; avagraha, not supported yet
    ("9" . "༩")
    ("(" . "༼")
    ("0" . "༠")
    (")" . "༽")
;;; ("-" ) ; emphatic, not yet supported
;;; ("_" ) ; id.
;;; ("=" ) ; special sign, not yet supported
    ("+" . "༑")
    ("\\" . "༏")
    ("|" . "༈")
    ("I" . "྅")				; avagraha
    (":" . "ཿ")
;;; (">" ?་) ; to be assigned to SPC
    (">" . " ")
    ("?" . "།")
    ("??" . "༎")
    ("????" . ["༎ ༎"])
    (" " . "་")
    ))

;; Convert TibKey string to Tibetan-Roman transcription string.
;; If there's no proper conversion, return nil.
(defun quail-tibkey-to-transcription (tibkey)
  (let ((len (length tibkey))
	(i 0)
	(trans-list nil))
    (while (< i len)
      (let ((last len)
	    trans)
	(while (and (not trans) (> last i))
	  (or (setq trans (cdr (assoc (substring tibkey i last)
				      tibetan-tibkey-to-transcription-alist)))
	      (setq last (1- last))))
	(if trans
	    (setq trans-list (cons trans trans-list)
		  i last)
	  (setq trans-list nil i len))))
    (apply #'concat (nreverse trans-list))))

(defvar quail-tibkey-characters nil)

(defun quail-tibkey-update-translation (control-flag)
  (if (integerp control-flag)
      ;; Non-composable-character typed.
      (setq quail-current-str
	    (buffer-substring (overlay-start quail-overlay)
			      (overlay-end quail-overlay))
	    unread-command-events
	    (append
	     (substring quail-current-key control-flag)
             unread-command-events))
    (let ((transcription (quail-tibkey-to-transcription quail-current-key)))
      (if (> (length transcription) 0)
	  (let ((quail-current-key transcription))
	    (setq control-flag
		  (quail-tibetan-update-translation control-flag)))
	(or quail-current-str
	    (setq quail-current-str quail-current-key)))))
  control-flag)

(quail-define-package "tibetan-tibkey" "Tibetan" "TIBt" t
"Tibetan character input by TibKey key assignment.

\(This implementation is still incomplete.
 Therefore, the following key assignment is a provisional one.)

  [NOT SHIFTED]

  +-------------------------------------------------------+
  |`ྃ|1༡|2༢|3༣|4༤|5༥|6༦|7༧|8༨|9༩|0༠|-  |=  |\\༈|
  +-------------------------------------------------------+
     |qཀ|wཁ|eག|rང|tཅ|yཆ|uཇ|iཉ|oཏ|pཐ|[ད|]ན|
     +-----------------------------------------------+
      |aཔ| sཕ| dབ|fམ|gུ|h  |jོ|kཙ|lཚ|;ཛ|\\='ཝ|
      +---------------------------------------------+
         |zཞ|xཟ|cའ|vཡ|bར|nལ|mཤ|,ས|.ཧ|/ཨ|
         +---------------------------------------+
  The key `h' is used for consonant stacking.

  [SHIFTED]

  +----------------------------------------------------------+
  |~ྂ|!༄|@༅|#  |$  |%༔ |^༁|&  |*  |(༼|)༽|_  |+༑| |༈|
  +----------------------------------------------------------+
     |Qཀྵ|W  |E  |R  |Tྀ|Y  |U  |I྅|Oཊ|Pཋ|{ཌ|}ཎ|
     +-----------------------------------------------+
      |A  |S  |D  |Fཾ|Gི|H྄|Jེ|K  |L  |:ཿ|\"ྭ|
      +-------------------------------------------+
         |Z  |X  |Cཱ|Vྱ|Bྲ|Nླ|Mཥ|<  |>  |?། |
         +---------------------------------------+

  DIFFERENCE FROM THE ORIGINAL TIBKEY:

    1. Vowel `a' should be typed explicitly by the key `A'.
       This is really inconvenient.  But to make the coding
       scheme clear, it is desirable to have an explicit
       vowel sign for `a'.
    2. Tsheg is assigned to SPC key.  You can input a space
       by typing `>'.
    4. To avoid the default stacking ���� and to obtain གཡ,
       type `E' instead of `v' (=ཡ).
    3. There are many characters that are not supported in the
       current implementation (especially special signs).
       I hope I'll complete in a future revision.
"
 nil nil nil nil nil nil nil nil
 #'quail-tibkey-update-translation)

(quail-install-map
 (quail-map-from-table
  '((base-state (tibetan-consonant-tibkey-alist . s-state)
		(tibetan-non-stacking-tibkey-alist . s-state)
		tibetan-subjoined-tibkey-alist
		tibetan-vowel-tibkey-alist
		tibetan-modifier-tibkey-alist
		tibetan-punctuation-tibkey-alist)
    (s-state (tibetan-subjoined-tibkey-alist . s-state)
	     (tibetan-vowel-tibkey-alist . m-state))
    (m-state tibetan-modifier-tibkey-alist))))

;;; tibetan.el ends here
