/usr/share/emacs/site-lisp/auto-complete/fuzzy.el is in auto-complete-el 1.3.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 | ;;; fuzzy.el --- Fuzzy matching utilities
;; Copyright (C) 2010 Tomohiro Matsuyama
;; Author: Tomohiro Matsuyama <m2ym.pub@gmail.com>
;; Keywords: convenience
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;;; Code:
(eval-when-compile
(require 'cl))
(require 'regexp-opt)
(defgroup fuzzy nil
"Fuzzy matching utilities."
:group 'convenience
:prefix "fuzzy-")
(defcustom fuzzy-accept-error-rate 0.10
"Error threshold."
:group 'fuzzy)
(defvar fuzzy-accept-length-difference 2)
(defvar fuzzy-regexp-some-char (format "\\w\\{0,%s\\}" fuzzy-accept-length-difference))
;;; Functions
(defun fuzzy-reverse-string (string)
(apply 'string (nreverse (append string nil))))
(defun fuzzy-regexp-compile (string)
(labels ((oddp (n) (eq (logand n 1) 1))
(evenp (n) (eq (logand n 1) 0))
(opt (n) (regexp-opt-charset (append (substring string
(max 0 (- n 1))
(min (length string) (+ n 2))) nil))))
(concat
"\\("
(loop for i below (length string)
for c = (if (evenp i) (opt i) fuzzy-regexp-some-char)
concat c)
"\\|"
(loop for i below (length string)
for c = (if (oddp i) (opt i) fuzzy-regexp-some-char)
concat c)
"\\)")))
(defalias 'fuzzy-edit-distance 'fuzzy-jaro-winkler-distance)
(defun fuzzy-jaro-winkler-distance (s1 s2)
"http://en.wikipedia.org/wiki/Jaro-Winkler_distance"
(let* ((l1 (length s1))
(l2 (length s2))
(r (max 1 (1- (/ (max l1 l2) 2))))
(m 0)
(tr 0)
(p 0)
cs1 cs2)
(loop with seen = (make-vector l2 nil)
for i below l1
for c1 = (aref s1 i) do
(loop for j from (max 0 (- i r)) below (min l2 (+ i r))
for c2 = (aref s2 j)
if (and (char-equal c1 c2)
(null (aref seen j))) do
(push c1 cs1)
(aset seen j c2)
(incf m)
and return nil)
finally
(setq cs1 (nreverse cs1)
cs2 (loop for i below l2
for c = (aref seen i)
if c collect c)))
(loop for c1 in cs1
for c2 in cs2
if (not (char-equal c1 c2)) do
(incf tr))
(loop for i below (min m 5)
for c1 across s1
for c2 across s2
while (char-equal c1 c2) do
(incf p))
(if (eq m 0)
0.0
(setq m (float m))
(let* ((dj (/ (+ (/ m l1) (/ m l2) (/ (- m (/ tr 2)) m)) 3))
(dw (+ dj (* p 0.1 (- 1 dj)))))
dw))))
;; this function should be compiled
(byte-compile 'fuzzy-jaro-winkler-distance)
(defun fuzzy-match (s1 s2 &optional function)
(or function (setq function 'fuzzy-edit-distance))
(and (<= (abs (- (length s1) (length s2)))
fuzzy-accept-length-difference)
(>= (funcall function s1 s2)
(- 1 fuzzy-accept-error-rate))))
(defun fuzzy-all-completions (string collection)
"all-completions family with fuzzy matching."
(loop with length = (length string)
for str in collection
for s = (substring str 0 (min (length str)
(+ length fuzzy-accept-length-difference)))
if (fuzzy-match string s)
collect str))
;;; Search and Incremental Search
(defvar fuzzy-search-cache nil)
(defvar fuzzy-search-cache-string nil)
(defun fuzzy-search-cache-activate ()
(setq fuzzy-search-cache (make-hash-table))
(setq fuzzy-search-cache-string nil))
(defun fuzzy-search-cache-deactive ()
(setq fuzzy-search-cache nil)
(setq fuzzy-search-cache-string nil))
(defun fuzzy-search-edit-distance (s1 s2)
(or (and fuzzy-search-cache
(cond
((null fuzzy-search-cache-string)
(setq fuzzy-search-cache-string s1)
nil)
((not (equal fuzzy-search-cache-string s1))
(setq fuzzy-search-cache-string s1)
(clrhash fuzzy-search-cache)
nil)
(t))
(gethash s2 fuzzy-search-cache))
(let ((d (fuzzy-edit-distance s1 s2)))
(if fuzzy-search-cache
(puthash s2 d fuzzy-search-cache))
d)))
(defun fuzzy-search-match (s1 s2)
(fuzzy-match s1 s2 'fuzzy-search-edit-distance))
(defun fuzzy-search-forward (string &optional bound noerror count)
(let* ((regexp (fuzzy-regexp-compile string))
match-data)
(save-excursion
(while (and (null match-data)
(re-search-forward regexp bound t))
(if (fuzzy-search-match string (match-string 1))
(setq match-data (match-data))
(goto-char (1+ (match-beginning 1))))))
(when match-data
(store-match-data match-data)
(goto-char (match-end 1)))))
(defun fuzzy-search-backward (string &optional bound noerror count)
(let* ((regexp (fuzzy-regexp-compile string))
match-data begin end)
(save-excursion
(while (and (null match-data)
(re-search-backward regexp bound t))
(setq begin (match-beginning 1)
end (match-end 1))
(store-match-data nil)
(goto-char (max (point-min) (- begin (* (length string) 2))))
(while (re-search-forward regexp end t)
(if (fuzzy-search-match string (match-string 1))
(setq match-data (match-data))
(goto-char (1+ (match-beginning 1)))))
(unless match-data
(goto-char begin)))
(if match-data
(progn
(store-match-data match-data)
(goto-char (match-beginning 1)))
(store-match-data nil)))))
(defvar fuzzy-isearch nil)
(defvar fuzzy-isearch-failed-count 0)
(defvar fuzzy-isearch-enabled 'on-failed)
(defvar fuzzy-isearch-original-search-fun nil)
(defvar fuzzy-isearch-prefix "[FUZZY] ")
(defun fuzzy-isearch-activate ()
(setq fuzzy-isearch t)
(setq fuzzy-isearch-failed-count 0)
(fuzzy-search-cache-activate))
(defun fuzzy-isearch-deactivate ()
(setq fuzzy-isearch nil)
(setq fuzzy-isearch-failed-count 0)
(fuzzy-search-cache-deactive))
(defun fuzzy-isearch ()
(cond (isearch-word
(if isearch-forward 'word-search-forward 'word-search-backward))
(isearch-regexp
(if isearch-forward 're-search-forward 're-search-backward))
((or fuzzy-isearch
(eq fuzzy-isearch-enabled 'always)
(and (eq fuzzy-isearch-enabled 'on-failed)
(null isearch-success)
isearch-wrapped
(> (setq fuzzy-isearch-failed-count (1+ fuzzy-isearch-failed-count))
1)))
(unless fuzzy-isearch
;(goto-char isearch-opoint)
(fuzzy-isearch-activate))
(if isearch-forward 'fuzzy-search-forward 'fuzzy-search-backward))
(t
(if isearch-forward 'search-forward 'search-backward))))
(defun fuzzy-isearch-end-hook ()
(fuzzy-isearch-deactivate))
(defun turn-on-fuzzy-isearch ()
(interactive)
(setq fuzzy-isearch-original-search-fun isearch-search-fun-function)
(setq isearch-search-fun-function 'fuzzy-isearch)
(add-hook 'isearch-mode-end-hook 'fuzzy-isearch-end-hook))
(defun turn-off-fuzzy-isearch ()
(interactive)
(setq isearch-search-fun-function fuzzy-isearch-original-search-fun)
(remove-hook 'isearch-mode-end-hook 'fuzzy-isearch-end-hook))
(defadvice isearch-message-prefix (after fuzzy-isearch-message-prefix activate)
(if fuzzy-isearch
(setq ad-return-value (concat fuzzy-isearch-prefix ad-return-value))
ad-return-value))
(provide 'fuzzy)
;;; fuzzy.el ends here
|