-;;; soundex.el -- implement Soundex algorithm
+;;; soundex.el --- implement Soundex algorithm
;; Copyright (C) 1993 Free Software Foundation, Inc.
;; 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.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Code:
+(defvar soundex-alist
+ '((?B . "1") (?F . "1") (?P . "1") (?V . "1")
+ (?C . "2") (?G . "2") (?J . "2") (?K . "2") (?Q . "2") (?S . "2")
+ (?X . "2") (?Z . "2") (?D . "3") (?T . "3") (?L . "4") (?M . "5")
+ (?N . "5") (?R . "6"))
+ "Alist of chars-to-key-code for building Soundex keys.")
+
(defun soundex (word)
"Return a Soundex key for WORD.
Implemented as described in:
(let* ((word (upcase word)) (length (length word))
(code (cdr (assq (aref word 0) soundex-alist)))
(key (substring word 0 1)) (index 1) (prev-code code))
- ;; once we have a four char key, were done
+ ;; once we have a four char key, we're done
(while (and (> 4 (length key)) (< index length))
;; look up the code for each letter in word at index
(setq code (cdr (assq (aref word index) soundex-alist))
(substring (concat key "000") 0 4)
key)))
-(defvar soundex-alist
- '((?A . nil) (?E . nil) (?H . nil) (?I . nil) (?O . nil) (?U . nil)
- (?W . nil) (?Y . nil) (?B . "1") (?F . "1") (?P . "1") (?V . "1")
- (?C . "2") (?G . "2") (?J . "2") (?K . "2") (?Q . "2") (?S . "2")
- (?X . "2") (?Z . "2") (?D . "3") (?T . "3") (?L . "4") (?M . "5")
- (?N . "5") (?R . "6"))
- "Alist of chars-to-key-code for building Soundex keys.")
-
;(defvar soundex-test
; '("Euler" "Gauss" "Hilbert" "Knuth" "Lloyd" "Lukasiewicz"
; "Ellery" "Ghosh" "Heilbronn" "Kant" "Ladd" "Lissajous")
;("E460" "G200" "H416" "K530" "L300" "L222"
; "E460" "G200" "H416" "K530" "L300" "L222")
+(provide 'soundex)
+
;; soundex.el ends here