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Fix categorization of Thai characters in
thai-category-table. (thai-composition-pattern): Adjust it for the above change. (thai-self-insert-command, thai-compose-syllable): New functions. (thai-compose-region): Use thai-compose-syllable. (thai-compose-string): Likewise. (thai-composition-function): Likewise. (thai-auto-composition): New function. (thai-auto-composition-mode): New minor mode.
This commit is contained in:
Kenichi Handa
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7b6fb48002
commit
8f9eda28ce
1 changed files with 119 additions and 29 deletions
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@ -2,6 +2,9 @@
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;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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;; Licensed to the Free Software Foundation.
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;; Copyright (C) 2005
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Keywords: mule, multilingual, thai
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@ -31,20 +34,38 @@
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(defconst thai-category-table (make-category-table))
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(define-category ?c "Thai consonant" thai-category-table)
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(define-category ?v "Thai upper/lower vowel" thai-category-table)
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(define-category ?t "Thai tone" thai-category-table)
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(define-category ?t "Thai tone mark" thai-category-table)
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(define-category ?u "Thai tone mark and upper sign" thai-category-table)
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(define-category ?I "THAI CHARACTER SARA I" thai-category-table)
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(define-category ?U "THAI CHARACTER THANTHAKHAT" thai-category-table)
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;; The general composing rules are as follows:
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;;
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;; T
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;; V T V T
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;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
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;; V U V U
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;; CV -> C, CU -> C, CVT -> C, Cv -> C, CvU -> C
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;; v v
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;;
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;; where C: consonant, V: vowel upper, v: vowel lower, T: tone mark.
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;; where C: consonant, V: vowel upper, v: vowel lower,
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;; T: tone mark, U: tone mark and upper sign.
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;; Special rule: The sign `,Tl(B' can be put on the vowel `,TT(B'.
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(defvar thai-composition-pattern "\\cc\\(\\ct\\|\\cv\\ct?\\)"
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(defvar thai-composition-pattern
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"\\cc\\(\\cu\\|\\cI\\cU\\|\\cv\\ct?\\)\\|\\cv\\ct\\|\\cI\\cU"
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"Regular expression matching a Thai composite sequence.")
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(defun thai-self-insert-command (&optional n)
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"Insert the Thai character you type.
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The character will be composed with the surrounding Thai character
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if necessary."
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(interactive "*p")
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(let ((pos (point))
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category-set ch)
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(self-insert-command n)
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(or thai-auto-composition-mode
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(thai-auto-composition (1- (point)) (point) 0))))
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(let ((l '((?,T!(B consonant "LETTER KO KAI") ; 0xA1
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(?,T"(B consonant "LETTER KHO KHAI") ; 0xA2
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(?,T#(B consonant "LETTER KHO KHUAT") ; 0xA3
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@ -115,14 +136,14 @@
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(?,Td(B vowel-base "VOWEL SIGN SARA MAI MALAI") ; 0xE4
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(?,Te(B vowel-base "LAK KHANG YAO") ; 0xE5
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(?,Tf(B special "MAI YAMOK (repetion)") ; 0xE6
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(?,Tg(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
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(?,Tg(B sign-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
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(?,Th(B tone "TONE MAI EK N/S-T") ; 0xE8
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(?,Ti(B tone "TONE MAI THO N/S-T") ; 0xE9
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(?,Tj(B tone "TONE MAI TRI N/S-T") ; 0xEA
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(?,Tk(B tone "TONE MAI CHATTAWA N/S-T") ; 0xEB
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(?,Tl(B tone "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
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(?,Tm(B tone "NIKKHAHIT N/S-T (final nasal)") ; 0xED
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(?,Tn(B vowel-upper "YAMAKKAN N/S-T") ; 0xEE
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(?,Tl(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
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(?,Tm(B sign-upper "NIKKHAHIT N/S-T (final nasal)") ; 0xED
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(?,Tn(B sign-upper "YAMAKKAN N/S-T") ; 0xEE
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(?,To(B special "FONRMAN") ; 0xEF
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(?,Tp(B special "DIGIT ZERO") ; 0xF0
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(?,Tq(B special "DIGIT ONE") ; 0xF1
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@ -207,14 +228,14 @@
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(?$,1CD(B vowel-base "VOWEL SIGN SARA MAI MALAI")
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(?$,1CE(B vowel-base "LAK KHANG YAO")
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(?$,1CF(B special "MAI YAMOK (repetion)")
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(?$,1CG(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T")
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(?$,1CG(B sign-upper "VOWEL SIGN MAI TAI KHU N/S-T")
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(?$,1CH(B tone "TONE MAI EK N/S-T")
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(?$,1CI(B tone "TONE MAI THO N/S-T")
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(?$,1CJ(B tone "TONE MAI TRI N/S-T")
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(?$,1CK(B tone "TONE MAI CHATTAWA N/S-T")
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(?$,1CL(B tone "THANTHAKHAT N/S-T (cancellation mark)")
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(?$,1CM(B tone "NIKKHAHIT N/S-T (final nasal)")
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(?$,1CN(B vowel-upper "YAMAKKAN N/S-T")
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(?$,1CL(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)")
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(?$,1CM(B sign-upper "NIKKHAHIT N/S-T (final nasal)")
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(?$,1CN(B sign-upper "YAMAKKAN N/S-T")
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(?$,1CO(B special "FONRMAN")
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(?$,1CP(B special "DIGIT ZERO")
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(?$,1CQ(B special "DIGIT ONE")
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@ -236,25 +257,61 @@
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(ptype (nth 1 elm)))
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(put-char-code-property char 'phonetic-type ptype)
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(cond ((eq ptype 'consonant)
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(modify-category-entry char ?c thai-category-table))
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(modify-category-entry char ?c thai-category-table)
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(global-set-key (vector char) 'thai-self-insert-command))
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((memq ptype '(vowel-upper vowel-lower))
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(modify-category-entry char ?v thai-category-table))
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(modify-category-entry char ?v thai-category-table)
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(if (or (= char ?,TT(B) (= char ?$,1C4(B))
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;; Give category `I' to "SARA I".
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(modify-category-entry char ?I thai-category-table))
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(global-set-key (vector char) 'thai-self-insert-command))
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((eq ptype 'tone)
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(modify-category-entry char ?t thai-category-table)))
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(modify-category-entry char ?t thai-category-table)
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(modify-category-entry char ?u thai-category-table)
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(global-set-key (vector char) 'thai-self-insert-command))
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((eq ptype 'sign-upper)
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(modify-category-entry char ?u thai-category-table)
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(if (or (= char ?,Tl(B) (= char ?$,1CL(B))
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;; Give category `U' to "THANTHAKHAT".
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(modify-category-entry char ?U thai-category-table))
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(global-set-key (vector char) 'thai-self-insert-command)))
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(put-char-code-property char 'name (nth 2 elm)))))
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(defun thai-compose-syllable (beg end &optional category-set string)
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(or category-set
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(setq category-set
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(char-category-set (if string (aref string beg) (char-after beg)))))
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(if (aref category-set ?c)
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;; Starting with a consonant. We do relative composition.
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(if string
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(compose-string string beg end)
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(compose-region beg end))
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;; Vowel tone sequence.
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(if string
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(compose-string string beg end (list (aref string beg) '(Bc . Bc)
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(aref string (1+ beg))))
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(compose-region beg end (list (char-after beg) '(Bc . Bc)
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(char-after (1+ beg))))))
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(- end beg))
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;;;###autoload
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(defun thai-compose-region (beg end)
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"Compose Thai characters in the region.
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When called from a program, expects two arguments,
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positions (integers or markers) specifying the region."
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(interactive "r")
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(save-restriction
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(narrow-to-region beg end)
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(goto-char (point-min))
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(with-category-table thai-category-table
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(while (re-search-forward thai-composition-pattern nil t)
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(compose-region (match-beginning 0) (match-end 0))))))
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(let ((pos (point)))
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(save-restriction
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(narrow-to-region beg end)
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(goto-char (point-min))
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(with-category-table thai-category-table
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(while (re-search-forward thai-composition-pattern nil t)
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(setq beg (match-beginning 0) end (match-end 0))
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(if (and (> pos beg) (< pos end))
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(setq pos end))
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(thai-compose-syllable beg end
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(char-category-set (char-after beg))))))
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(goto-char pos)))
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;;;###autoload
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(defun thai-compose-string (string)
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@ -262,7 +319,7 @@ positions (integers or markers) specifying the region."
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(with-category-table thai-category-table
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(let ((idx 0))
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(while (setq idx (string-match thai-composition-pattern string idx))
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(compose-string string idx (match-end 0))
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(thai-compose-syllable idx (match-end 0) nil string)
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(setq idx (match-end 0)))))
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string)
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@ -285,12 +342,45 @@ Optional 4th argument STRING, if non-nil, is a string containing text
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to compose.
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The return value is number of composed characters."
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(if (< (1+ from) to)
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(progn
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(if string
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(compose-string string from to)
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(compose-region from to))
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(- to from))))
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(when (and (not thai-auto-composition-mode)
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(< (1+ from) to))
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(with-category-table thai-category-table
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(if string
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(if (eq (string-match thai-composition-pattern string from) from)
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(thai-compose-syllable from (match-end 0) nil string))
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(if (save-excursion
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(goto-char from)
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(and (looking-at thai-composition-pattern)
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(setq to (match-end 0))))
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(thai-compose-syllable from to))))))
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(defun thai-auto-composition (beg end len)
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(with-category-table thai-category-table
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(let (category-set)
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(while (and (> beg (point-min))
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(setq category-set (char-category-set (char-after (1- beg))))
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(or (aref category-set ?v) (aref category-set ?u)))
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(setq beg (1- beg)))
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(if (and (> beg (point-min))
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(aref (char-category-set (char-after (1- beg))) ?c))
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(setq beg (1- beg)))
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(while (and (< end (point-max))
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(setq category-set (char-category-set (char-after end)))
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(or (aref category-set ?v) (aref category-set ?u)))
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(setq end (1+ end)))
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(if (< beg end)
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(thai-compose-region beg end)))))
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(put 'thai-auto-composition-mode 'permanent-local t)
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;;;###autoload
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(define-minor-mode thai-auto-composition-mode
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"Minor mode for automatically correct Thai character composition."
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nil nil nil
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(cond ((null thai-auto-composition-mode)
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(remove-hook 'after-change-functions 'thai-auto-composition))
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(t
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(add-hook 'after-change-functions 'thai-auto-composition))))
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;;
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(provide 'thai-util)
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