Initial revision

[bpt/emacs.git] / lisp / international / skkdic-utl.el

;; skkdic-utl.el -- utility functions for handling skkdic.el

;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.

;; Keywords: mule, multilingual, Japanese, SKK

;; 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 2, 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; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Commentary:

;; SKK is a free Japanese input method running on Mule created by
;; Masahiko Sato <masahiko@sato.riec.tohoku.ac.jp>.  A dictionary of
;; SKK can be converted by `skkdic-convert' (skkdic-conv.el) to a file
;; "skkdic.el" in which the dictionary entries are defined in the
;; format which can be handled by the following functions.

;;; Code:

(defvar skkdic-okuri-ari nil
  "OKURI-ARI entries of SKK dictionary.")
(defvar skkdic-postfix nil
  "POSTFIX entries of SKK dictionary.")
(defvar skkdic-prefix nil
  "PREFIX entries of SKK dictionary.")
(defvar skkdic-okuri-nasi nil
  "OKURI-NASI entries of SKK dictionary.")

;; Alist of Okuriganas vs trailing ASCII letters in OKURI-ARI entry.
(defconst skkdic-okurigana-table
  '((?\e$B$!\e(B . ?a) (?\e$B$"\e(B . ?a) (?\e$B$#\e(B . ?i) (?\e$B$$\e(B . ?i) (?\e$B$%\e(B . ?u)
    (?\e$B$&\e(B . ?u) (?\e$B$'\e(B . ?e) (?\e$B$(\e(B . ?e) (?\e$B$)\e(B . ?o) (?\e$B$*\e(B . ?o)
    (?\e$B$+\e(B . ?k) (?\e$B$,\e(B . ?g) (?\e$B$-\e(B . ?k) (?\e$B$.\e(B . ?g) (?\e$B$/\e(B . ?k)
    (?\e$B$0\e(B . ?g) (?\e$B$1\e(B . ?k) (?\e$B$2\e(B . ?g) (?\e$B$3\e(B . ?k) (?\e$B$4\e(B . ?g)
    (?\e$B$5\e(B . ?s) (?\e$B$6\e(B . ?z) (?\e$B$7\e(B . ?s) (?\e$B$8\e(B . ?j) (?\e$B$9\e(B . ?s)
    (?\e$B$:\e(B . ?z) (?\e$B$;\e(B . ?s) (?\e$B$<\e(B . ?z) (?\e$B$=\e(B . ?s) (?\e$B$>\e(B . ?z)
    (?\e$B$?\e(B . ?t) (?\e$B$@\e(B . ?d) (?\e$B$A\e(B . ?t) (?\e$B$B\e(B . ?d) (?\e$B$C\e(B . ?t)
    (?\e$B$D\e(B . ?t) (?\e$B$E\e(B . ?d) (?\e$B$F\e(B . ?t) (?\e$B$G\e(B . ?d) (?\e$B$H\e(B . ?t) (?\e$B$I\e(B . ?d)
    (?\e$B$J\e(B . ?n) (?\e$B$K\e(B . ?n) (?\e$B$L\e(B . ?n) (?\e$B$M\e(B . ?n) (?\e$B$N\e(B . ?n)
    (?\e$B$O\e(B . ?h) (?\e$B$P\e(B . ?b) (?\e$B$Q\e(B . ?p) (?\e$B$R\e(B . ?h) (?\e$B$S\e(B . ?b)
    (?\e$B$T\e(B . ?p) (?\e$B$U\e(B . ?h) (?\e$B$V\e(B . ?b) (?\e$B$W\e(B . ?p) (?\e$B$X\e(B . ?h)
    (?\e$B$Y\e(B . ?b) (?\e$B$Z\e(B . ?p) (?\e$B$[\e(B . ?h) (?\e$B$\\e(B . ?b) (?\e$B$]\e(B . ?p)
    (?\e$B$^\e(B . ?m) (?\e$B$_\e(B . ?m) (?\e$B$`\e(B . ?m) (?\e$B$a\e(B . ?m) (?\e$B$b\e(B . ?m)
    (?\e$B$c\e(B . ?y) (?\e$B$d\e(B . ?y) (?\e$B$e\e(B . ?y) (?\e$B$f\e(B . ?y) (?\e$B$g\e(B . ?y) (?\e$B$h\e(B . ?y)
    (?\e$B$i\e(B . ?r) (?\e$B$j\e(B . ?r) (?\e$B$k\e(B . ?r) (?\e$B$l\e(B . ?r) (?\e$B$m\e(B . ?r)
    (?\e$B$o\e(B . ?w) (?\e$B$p\e(B . ?w) (?\e$B$q\e(B . ?w) (?\e$B$r\e(B . ?w)
    (?\e$B$s\e(B . ?n)
    ))

(defconst skkdic-jbytes
  (charset-bytes 'japanese-jisx0208))

(defun skkdic-merge-head-and-tail (heads tails postfix)
  (let ((min-len (* skkdic-jbytes 2))
	l)
    (while heads
      (if (or (not postfix)
	      (>= (length (car heads)) min-len))
	  (let ((tail tails))
	    (while tail
	      (if (or postfix
		      (>= (length (car tail)) min-len))
		  (setq l (cons (concat (car heads) (car tail)) l)))
	      (setq tail (cdr tail)))))
      (setq heads (cdr heads)))
    l))

(defconst skkdic-jisx0208-hiragana-block (nth 1 (split-char ?\e$B$"\e(B)))

(defun skkdic-lookup-key (seq len &optional postfix)
  "Return a list of conversion string for sequence SEQ of length LEN.

SEQ is a vector of Kana characters to be converted by SKK dictionary.
If LEN is shorter than the length of KEYSEQ, the first LEN keys in SEQ
are took into account.

Postfixes are handled only if the optional argument POSTFIX is non-nil."
  (or skkdic-okuri-nasi
      (condition-case err
	  (load-library "skk/skkdic")
	(error (ding)
	       (with-output-to-temp-buffer "*Help*"
		 (princ "The library `skkdic' can't be loaded.

The most common case is that you have not yet installed the library
included in LEIM (Libraries of Emacs Input Method) which is
distributed separately from Emacs.

LEIM is available from the same ftp directory as Emacs."))
	       (signal (car err) (cdr err)))))

  (let ((vec (make-vector len 0))
	(i 0)
	entry)
    ;; At first, generate vector VEC from SEQ for looking up SKK
    ;; alists.  Nth element in VEC corresponds to Nth element in SEQ.
    ;; The values are decided as follows.
    ;;   If SEQ[N] is `\e$B!<\e(B', VEC[N] is 0,
    ;;   Else if SEQ[N] is a Hiragana character, VEC[N] is:
    ;;     ((The 2nd position code o SEQ[N]) - 32),
    ;;   ELse VEC[N] is 128.
    (while (< i len)
      (let ((ch (aref seq i))
	    elts)
	(if (= ch ?\e$B!<\e(B)
	    (aset vec i 0)
	  (setq elts (split-char ch))
	  (if (and (eq (car elts) 'japanese-jisx0208)
		   (= (nth 1 elts) skkdic-jisx0208-hiragana-block))
	      (aset vec i (- (nth 2 elts) 32))
	    (aset vec i 128))))
      (setq i (1+ i)))

    ;; Search OKURI-NASI entries.
    (setq entry (lookup-nested-alist vec skkdic-okuri-nasi len 0 t))
    (if (consp (car entry))
	(setq entry (copy-sequence (car entry)))
      (setq entry nil))

    (if postfix
	;; Search OKURI-NASI entries with postfixes.
	(let ((break (max (- len (car skkdic-postfix)) 1))
	      entry-head entry-postfix entry2)
	  (while (< break len)
	    (if (and (setq entry-head
			   (lookup-nested-alist vec skkdic-okuri-nasi
						break 0 t))
		     (consp (car entry-head))
		     (setq entry-postfix
			   (lookup-nested-alist vec skkdic-postfix
						len break t))
		     (consp (car entry-postfix))
		     (setq entry2 (skkdic-merge-head-and-tail
				   (car entry-head) (car entry-postfix) t)))
		(if entry
		    (nconc entry entry2)
		  (setq entry entry2)))
	    (setq break (1+ break)))))

    ;; Search OKURI-NASI entries with prefixes.
    (let ((break (min (car skkdic-prefix) (- len 2)))
	  entry-prefix entry-tail entry2)
      (while (> break 0)
	(if (and (setq entry-prefix
		       (lookup-nested-alist vec skkdic-prefix break 0 t))
		 (consp (car entry-prefix))
		 (setq entry-tail
		       (lookup-nested-alist vec skkdic-okuri-nasi len break t))
		 (consp (car entry-tail))
		 (setq entry2 (skkdic-merge-head-and-tail
			       (car entry-prefix) (car entry-tail) nil)))
	    (if entry
		(nconc entry entry2)
	      (setq entry entry2)))
	(setq break (1- break))))

    ;; Search OKURI-ARI entries.
    (let ((okurigana (assq (aref seq (1- len)) skkdic-okurigana-table))
	  orig-element entry2)
      (if okurigana
	  (progn
	    (setq orig-element (aref vec (1- len)))
	    (aset vec (1- len) (- (cdr okurigana)))
	    (if (and (setq entry2 (lookup-nested-alist vec skkdic-okuri-ari
						       len 0 t))
		     (consp (car entry2)))
		(progn
		  (setq entry2 (copy-sequence (car entry2)))
		  (let ((l entry2)
			(okuri (char-to-string (aref seq (1- len)))))
		    (while l
		      (setcar l (concat (car l) okuri))
		      (setq l (cdr l)))
		    (if entry
			(nconc entry entry2)
		      (setq entry entry2)))))
	    (aset vec (1- len) orig-element))))

    entry))

;;
(provide 'skkdic-utl)

;; skkdic-utl.el ends here