;; vi-viqr.mim -- Input method for Vietnames with VIQR key sequence
;; Copyright (C) 2003, 2004, 2005
;;   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.

(input-method vi viqr)

(description (_"Vietnames input method using the VIQR key sequence.
Typing Backslash ('\\') toggles the normal mode and English mode.
The following variables are customizable:
  tone-mark-on-last: control tone mark position in equivocal cases
  backspace-is-undo: control the action of Backspace key (delete or undo)"))

(title "Ắ(VIQR)")

(variable
 (tone-mark-on-last
  (_"Flag to control tone mark position in equivocal cases.
If this variable is 0 (the default), put tone mark on the first vowel
in such equivocal cases as \"oa\", \"oe\", \"uy\".
Otherwise, put tone mark on the last vowel.")
  0 0 1)

 (backspace-is-undo
  (_"Flag to control the action of Backspace key (delete or undo).
If this variable is 0 (the default), Backspace key deletes the previous
character (e.g. \"q u a i s BS\" => \"quá\").
If the value is 1, Backspace key undoes the previous key
\(e.g. \"q u a i s BS\" => \"quai\").")
  0 0 1))

(include (t nil vi-base) macro)
(include (t nil vi-base) map)

(map
 (vowel-ext
  ("a^" ("âấầẩẫậ")) ("A^" ("ÂẤẦẨẪẬ"))
  ("a(" ("ăắằẳẵặ")) ("A(" ("ĂẮẰẲẴẶ"))
  ("e^" ("êếềểễệ")) ("E^" ("ÊẾỀỂỄỆ"))
  ("o^" ("ôốồổỗộ")) ("O^" ("ÔỐỒỔỖỘ"))
  ("o+" ("ơớờởỡợ")) ("O+" ("ƠỚỜỞỠỢ"))
  ("u+" ("ưứừửữự")) ("U+" ("ƯỨỪỬỮỰ")))

 (consonant-ext
  ("dd" ?đ) ("DD" ?Đ) ("Dd" ?Đ))

 (tone-mark
  ("0" (set SELECT 0) ?0)
  ("'" (set SELECT 1) ?1)
  ("`" (set SELECT 2) ?2)
  ("?" (set SELECT 3) ?3)
  ("~" (set SELECT 4) ?4)
  ("." (set SELECT 5) ?5))

 (temporary-escape
  ("a^^" "a^") ("A^^" "A^")
  ("a((" "a(") ("A((" "A(")
  ("e^^" "e^") ("E^^" "E^")
  ("o^^" "o^") ("O^^" "O^")
  ("o++" "o+") ("O++" "O+")
  ("u++" "u+") ("U++" "U+")))

(state
 (init
  ;; Initialize variables.  C is the initial consonant.  V-N is the
  ;; (N-1)th vowel from the last.  C-AFTER-V is a number of consonants
  ;; typed after vowel.
  (t (set C @-1) (set V-1 0) (set V-2 0) (set V-3 0) (set C-AFTER-V 0)
     (set SELECT 0))

  (consonant (set C @-1))
  (consonant-ext (set C @-1))
  ;; Mark M remembers the preedit position after the last vowel.
  (vowel (mark M) (set V-2 V-1) (set V-1 @-1) (shift after-v))
  (vowel-ext (mark M) (set V-2 V-1) (set V-1 @-1) (shift after-v))
  (temporary-escape (shift temporary-escape))
  (permanent-escape (shift escape-in-normal-mode)))

 ;; The state shifted to when a vowel is typed.
 (after-v
  (consonant (shift after-vc))
  (consonant-ext (shift after-vc))
  (vowel (mark M) (set V-3 V-2) (set V-2 V-1) (set V-1 @-1)
	 (move T) (select 0) (handle-mark) (move M))
  (vowel-ext (mark M) (set V-3 V-2) (set V-2 V-1) (set V-1 @-1)
	     (move T) (select 0) (handle-mark) (move M))
  (tone-mark (delete @-) (pushback 1) (shift after-t))
  (backspace (delete @-)
	     (cond (V-3 (set V-1 V-2) (set V-2 V-3) (set V-3 0)
			(cond ((> TPLACE 2) (set SELECT 0))))
		   (V-2 (set V-1 V-2) (set V-2 0)
			(cond ((> TPLACE 1) (set SELECT 0))))
		   (1 (shift init)))))

 ;; The state shifted to when a consonant is typed after a vowel.
 (after-vc
  (t (set C-AFTER-V 1))
  (consonant (add C-AFTER-V 1))
  (consonant-ext (add C-AFTER-V 1))
  (tone-mark (delete @-) (pushback 1) (shift after-t))
  (backspace (delete @-)
	     (sub C-AFTER-V 1)
	     (cond ((= C-AFTER-V 0) (shift after-v)))))

 ;; The state shifted to when a tone-mark is typed.
 (after-t
  (t (set CURRENT-SELECT -1))
  (tone-mark (cond ((= CURRENT-SELECT SELECT) (move T) (select 0) (move @>)
		    (shift temporary-escape))
		   (1 (delete @-) (handle-mark) (set CURRENT-SELECT SELECT))))
  (nil (cond (C-AFTER-V (shift after-vc))
	     (1 (shift after-v)))))

 (temporary-escape
  "en"
  (t (commit))
  (alnum (commit)))

 (escape-in-normal-mode
  "EN"
  (permanent-escape (insert "\\") (shift init))
  ;; Any other key force shifting to permanent-escape.
  (nil (shift permanent-escape)))

 (permanent-escape
  "EN"
  (t (set ESCAPE 1))
  (permanent-escape (shift escape-in-permanent-escape))
  ;; Unhandle any characters.
  (nil (unhandle)))

 (escape-in-permanent-escape
  "Ắ"
  (permanent-escape (insert "\\") (commit) (shift permanent-escape))
  ;; Any other key force shifting to init
  ))

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